Allow non-conforming ErrorHandlers (#2259)

* Allow non-conforming ErrorHandlers

* Rename to legacy lookup

* Updated depnotice

* Bump version

* Fix formatting

* Remove unused import

* Fix error messages

.codeclimate.yml

@@ -0,0 +1,24 @@
+exclude_patterns:
+  - "sanic/__main__.py"
+  - "sanic/reloader_helpers.py"
+  - "sanic/simple.py"
+  - "sanic/utils.py"
+  - ".github/"
+  - "changelogs/"
+  - "docker/"
+  - "docs/"
+  - "examples/"
+  - "hack/"
+  - "scripts/"
+  - "tests/"
+checks:
+  argument-count:
+    enabled: false
+  file-lines:
+    config:
+      threshold: 1000
+  method-count:
+    config:
+      threshold: 40
+  complex-logic:
+    enabled: false

.coveragerc

@@ -1,7 +1,12 @@
 [run]
 branch = True
 source = sanic
-omit = site-packages, sanic/utils.py, sanic/__main__.py
+omit =
+    site-packages
+    sanic/__main__.py
+    sanic/reloader_helpers.py
+    sanic/simple.py
+    sanic/utils.py
 
 [html]
 directory = coverage

.github/workflows/codeql-analysis.yml

@@ -1,22 +1,10 @@
-# For most projects, this workflow file will not need changing; you simply need
-# to commit it to your repository.
-#
-# You may wish to alter this file to override the set of languages analyzed,
-# or to provide custom queries or build logic.
-#
-# ******** NOTE ********
-# We have attempted to detect the languages in your repository. Please check
-# the `language` matrix defined below to confirm you have the correct set of
-# supported CodeQL languages.
-#
 name: "CodeQL"
 
 on:
   push:
-    branches: [ master ]
+    branches: [ main ]
   pull_request:
-    # The branches below must be a subset of the branches above
-    branches: [ master ]
+    branches: [ main ]
   schedule:
     - cron: '25 16 * * 0'
 
@@ -29,39 +17,18 @@ jobs:
       fail-fast: false
       matrix:
         language: [ 'python' ]
-        # CodeQL supports [ 'cpp', 'csharp', 'go', 'java', 'javascript', 'python' ]
-        # Learn more:
-        # https://docs.github.com/en/free-pro-team@latest/github/finding-security-vulnerabilities-and-errors-in-your-code/configuring-code-scanning#changing-the-languages-that-are-analyzed
 
     steps:
     - name: Checkout repository
       uses: actions/checkout@v2
 
-    # Initializes the CodeQL tools for scanning.
     - name: Initialize CodeQL
       uses: github/codeql-action/init@v1
       with:
         languages: ${{ matrix.language }}
-        # If you wish to specify custom queries, you can do so here or in a config file.
-        # By default, queries listed here will override any specified in a config file.
-        # Prefix the list here with "+" to use these queries and those in the config file.
-        # queries: ./path/to/local/query, your-org/your-repo/queries@main
 
-    # Autobuild attempts to build any compiled languages  (C/C++, C#, or Java).
-    # If this step fails, then you should remove it and run the build manually (see below)
     - name: Autobuild
       uses: github/codeql-action/autobuild@v1
 
-    # ℹ️ Command-line programs to run using the OS shell.
-    # 📚 https://git.io/JvXDl
-
-    # ✏️ If the Autobuild fails above, remove it and uncomment the following three lines
-    #    and modify them (or add more) to build your code if your project
-    #    uses a compiled language
-
-    #- run: |
-    #   make bootstrap
-    #   make release
-
     - name: Perform CodeQL Analysis
       uses: github/codeql-action/analyze@v1

.github/workflows/coverage.yml

@@ -0,0 +1,40 @@
+name: Coverage check
+# on:
+#   push:
+#     branches:
+#       - main
+#     tags:
+#       - "!*" # Do not execute on tags
+#     paths:
+#       - sanic/*
+#       - tests/*
+#   pull_request:
+#     paths:
+#       - "!*.MD"
+on: [push, pull_request]
+jobs:
+  test:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        python-version: [3.9]
+        os: [ubuntu-latest]
+      fail-fast: false
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - uses: actions/setup-python@v1
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Install dependencies 🔨
+        run: |
+          python -m pip install --upgrade pip
+          pip install tox
+      - uses: paambaati/codeclimate-action@v2.5.3
+        if: always()
+        env:
+          CC_TEST_REPORTER_ID: ${{ secrets.CODECLIMATE }}
+        with:
+          coverageCommand: tox -e coverage

.github/workflows/on-demand.yml

@@ -0,0 +1,39 @@
+name: On Demand Task
+on:
+  workflow_dispatch:
+    inputs:
+      python-version:
+        description: 'Version of Python to use for running Test'
+        required: false
+        default: "3.8"
+      tox-env:
+        description: 'Test Environment to Run'
+        required: true
+        default: ''
+      os:
+        description: 'Operating System to Run Test on'
+        required: false
+        default: ubuntu-latest
+jobs:
+  onDemand:
+    name: tox-${{ matrix.config.tox-env }}-on-${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: ["${{ github.event.inputs.os}}"]
+        config:
+          - { tox-env: "${{ github.event.inputs.tox-env }}", py-version: "${{ github.event.inputs.python-version }}"}
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@v2
+
+      - name: Run tests
+        uses: harshanarayana/custom-actions@main
+        with:
+          python-version: ${{ matrix.config.py-version }}
+          test-infra-tool: tox
+          test-infra-version: latest
+          action: tests
+          test-additional-args: "-e=${{ matrix.config.tox-env }}"
+          experimental-ignore-error: "yes"

.github/workflows/pr-bandit.yml

@@ -0,0 +1,32 @@
+name: Security Analysis
+on:
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  bandit:
+    name: type-check-${{ matrix.config.python-version }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest]
+        config:
+          - { python-version: 3.7, tox-env: security}
+          - { python-version: 3.8, tox-env: security}
+          - { python-version: 3.9, tox-env: security}
+    steps:
+      - name: Checkout the repository
+        uses: actions/checkout@v2
+        id: checkout-branch
+
+      - name: Run Linter Checks
+        id: linter-check
+        uses: harshanarayana/custom-actions@main
+        with:
+          python-version: ${{ matrix.config.python-version }}
+          test-infra-tool: tox
+          test-infra-version: latest
+          action: tests
+          test-additional-args: "-e=${{ matrix.config.tox-env }}"

.github/workflows/pr-docs.yml

@@ -0,0 +1,29 @@
+name: Document Linter
+on:
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  docsLinter:
+    name: Lint Documentation
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        config:
+          - {python-version: "3.8", tox-env: "docs"}
+      fail-fast: false
+
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Run Document Linter
+        uses: harshanarayana/custom-actions@main
+        with:
+          python-version: ${{ matrix.config.python-version }}
+          test-infra-tool: tox
+          test-infra-version: latest
+          action: tests
+          test-additional-args: "-e=${{ matrix.config.tox-env }}"

.github/workflows/pr-linter.yml

@@ -0,0 +1,30 @@
+name: Linter Checks
+on:
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  linter:
+    name: lint
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest]
+        config:
+          - { python-version: 3.8, tox-env: lint}
+    steps:
+      - name: Checkout the repository
+        uses: actions/checkout@v2
+        id: checkout-branch
+
+      - name: Run Linter Checks
+        id: linter-check
+        uses: harshanarayana/custom-actions@main
+        with:
+          python-version: ${{ matrix.config.python-version }}
+          test-infra-tool: tox
+          test-infra-version: latest
+          action: tests
+          test-additional-args: "-e=${{ matrix.config.tox-env }}"

.github/workflows/pr-python-pypy.yml

@@ -0,0 +1,41 @@
+name: Python PyPy Tests
+on:
+  workflow_dispatch:
+    inputs:
+      tox-env:
+        description: "Tox Env to run on the PyPy Infra"
+        required: false
+        default: "pypy37"
+      pypy-version:
+        description: "Version of PyPy to use"
+        required: false
+        default: "pypy-3.7"
+jobs:
+  testPyPy:
+    name: ut-${{ matrix.config.tox-env }}-${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        # os: [ubuntu-latest, macos-latest]
+        os: [ubuntu-latest]
+        config:
+          - {
+              python-version: "${{ github.event.inputs.pypy-version }}",
+              tox-env: "${{ github.event.inputs.tox-env }}",
+            }
+    steps:
+      - name: Checkout the Repository
+        uses: actions/checkout@v2
+        id: checkout-branch
+
+      - name: Run Unit Tests
+        uses: harshanarayana/custom-actions@main
+        with:
+          python-version: ${{ matrix.config.python-version }}
+          test-infra-tool: tox
+          test-infra-version: latest
+          action: tests
+          test-additional-args: "-e=${{ matrix.config.tox-env }}"
+          experimental-ignore-error: "true"
+          command-timeout: "600000"

.github/workflows/pr-python37.yml

@@ -0,0 +1,38 @@
+name: Python 3.7 Tests
+on:
+  pull_request:
+    branches:
+      - main
+  push:
+    branches:
+      - main
+    paths:
+      - sanic/*
+      - tests/*
+
+jobs:
+  testPy37:
+    name: ut-${{ matrix.config.tox-env }}-${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        #         os: [ubuntu-latest, macos-latest]
+        os: [ubuntu-latest]
+        config:
+          - { python-version: 3.7, tox-env: py37 }
+          - { python-version: 3.7, tox-env: py37-no-ext }
+    steps:
+      - name: Checkout the Repository
+        uses: actions/checkout@v2
+        id: checkout-branch
+
+      - name: Run Unit Tests
+        uses: harshanarayana/custom-actions@main
+        with:
+          python-version: ${{ matrix.config.python-version }}
+          test-infra-tool: tox
+          test-infra-version: latest
+          action: tests
+          test-additional-args: "-e=${{ matrix.config.tox-env }}"
+          test-failure-retry: "3"

.github/workflows/pr-python38.yml

@@ -0,0 +1,38 @@
+name: Python 3.8 Tests
+on:
+  pull_request:
+    branches:
+      - main
+  push:
+    branches:
+      - main
+    paths:
+      - sanic/*
+      - tests/*
+
+jobs:
+  testPy38:
+    name: ut-${{ matrix.config.tox-env }}-${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        # os: [ubuntu-latest, macos-latest]
+        os: [ubuntu-latest]
+        config:
+          - { python-version: 3.8, tox-env: py38 }
+          - { python-version: 3.8, tox-env: py38-no-ext }
+    steps:
+      - name: Checkout the Repository
+        uses: actions/checkout@v2
+        id: checkout-branch
+
+      - name: Run Unit Tests
+        uses: harshanarayana/custom-actions@main
+        with:
+          python-version: ${{ matrix.config.python-version }}
+          test-infra-tool: tox
+          test-infra-version: latest
+          action: tests
+          test-additional-args: "-e=${{ matrix.config.tox-env }}"
+          test-failure-retry: "3"

.github/workflows/pr-python39.yml

@@ -0,0 +1,50 @@
+name: Python 3.9 Tests
+on:
+  pull_request:
+    branches:
+      - main
+  push:
+    branches:
+      - main
+    paths:
+      - sanic/*
+      - tests/*
+
+jobs:
+  testPy39:
+    name: ut-${{ matrix.config.tox-env }}-${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        # os: [ubuntu-latest, macos-latest]
+        os: [ubuntu-latest]
+        config:
+          - {
+              python-version: 3.9,
+              tox-env: py39,
+              ignore-error-flake: "false",
+              command-timeout: "0",
+            }
+          - {
+              python-version: 3.9,
+              tox-env: py39-no-ext,
+              ignore-error-flake: "true",
+              command-timeout: "600000",
+            }
+    steps:
+      - name: Checkout the Repository
+        uses: actions/checkout@v2
+        id: checkout-branch
+
+      - name: Run Unit Tests
+        uses: harshanarayana/custom-actions@main
+        with:
+          python-version: ${{ matrix.config.python-version }}
+          test-infra-tool: tox
+          test-infra-version: latest
+          action: tests
+          test-additional-args: "-e=${{ matrix.config.tox-env }},-vv=''"
+          experimental-ignore-error: "${{ matrix.config.ignore-error-flake }}"
+          command-timeout: "${{ matrix.config.command-timeout }}"
+          test-failure-retry: "3"

.github/workflows/pr-type-check.yml

@@ -0,0 +1,32 @@
+name: Typing Checks
+on:
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  typeChecking:
+    name: type-check-${{ matrix.config.python-version }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest]
+        config:
+          - { python-version: 3.7, tox-env: type-checking}
+          - { python-version: 3.8, tox-env: type-checking}
+          - { python-version: 3.9, tox-env: type-checking}
+    steps:
+      - name: Checkout the repository
+        uses: actions/checkout@v2
+        id: checkout-branch
+
+      - name: Run Linter Checks
+        id: linter-check
+        uses: harshanarayana/custom-actions@main
+        with:
+          python-version: ${{ matrix.config.python-version }}
+          test-infra-tool: tox
+          test-infra-version: latest
+          action: tests
+          test-additional-args: "-e=${{ matrix.config.tox-env }}"

.github/workflows/pr-windows.yml

@@ -0,0 +1,34 @@
+name: Run Unit Tests on Windows
+on:
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  testsOnWindows:
+    name: ut-${{ matrix.config.tox-env }}
+    runs-on: windows-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        config:
+          - { python-version: 3.7, tox-env: py37-no-ext }
+          - { python-version: 3.8, tox-env: py38-no-ext }
+          - { python-version: 3.9, tox-env: py39-no-ext }
+          - { python-version: pypy-3.7, tox-env: pypy37-no-ext }
+
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@v2
+
+      - name: Run Unit Tests
+        uses: ahopkins/custom-actions@pip-extra-args
+        with:
+          python-version: ${{ matrix.config.python-version }}
+          test-infra-tool: tox
+          test-infra-version: latest
+          action: tests
+          test-additional-args: "-e=${{ matrix.config.tox-env }}"
+          experimental-ignore-error: "true"
+          command-timeout: "600000"
+          pip-extra-args: "--user"

.github/workflows/publish-images.yml

@@ -0,0 +1,48 @@
+name: Publish Docker Images
+on:
+  workflow_run:
+    workflows:
+      - 'Publish Artifacts'
+    types:
+      - completed
+
+jobs:
+  publishDockerImages:
+    name: Docker Image Build [${{ matrix.python-version }}]
+    runs-on: ubuntu-latest
+
+    strategy:
+      fail-fast: true
+      matrix:
+        python-version: ["3.7", "3.8", "3.9"]
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Build Latest Base images for ${{ matrix.python-version }}
+        uses: harshanarayana/custom-actions@main
+        with:
+          docker-image-base-name: sanicframework/sanic-build
+          ignore-python-setup: 'true'
+          dockerfile-base-dir: './docker'
+          action: 'image-publish'
+          docker-image-tag: "${{ matrix.python-version }}"
+          docker-file-suffix: "base"
+          docker-build-args: "PYTHON_VERSION=${{ matrix.python-version }}"
+          registry-auth-user: ${{ secrets.DOCKER_ACCESS_USER }}
+          registry-auth-password: ${{ secrets.DOCKER_ACCESS_TOKEN }}
+          push-images: 'true'
+
+      - name: Publish Sanic Docker Image for ${{ matrix.python-version }}
+        uses: harshanarayana/custom-actions@main
+        with:
+          docker-image-base-name: sanicframework/sanic
+          ignore-python-setup: 'true'
+          dockerfile-base-dir: './docker'
+          action: 'image-publish'
+          docker-build-args: "BASE_IMAGE_TAG=${{ matrix.python-version }}"
+          docker-image-prefix: "${{ matrix.python-version }}"
+          registry-auth-user: ${{ secrets.DOCKER_ACCESS_USER }}
+          registry-auth-password: ${{ secrets.DOCKER_ACCESS_TOKEN }}
+          push-images: 'true'

.github/workflows/publish-package.yml

@@ -0,0 +1,28 @@
+name: Publish Artifacts
+on:
+  release:
+    types: [created]
+
+jobs:
+  publishPythonPackage:
+    name: Publishing Sanic Release Artifacts
+    runs-on: ubuntu-latest
+
+    strategy:
+      fail-fast: true
+      matrix:
+        python-version: ["3.8"]
+
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@v2
+
+      - name: Publish Python Package
+        uses: harshanarayana/custom-actions@main
+        with:
+          python-version: ${{ matrix.python-version }}
+          package-infra-name: "twine"
+          pypi-user: __token__
+          pypi-access-token: ${{ secrets.PYPI_ACCESS_TOKEN }}
+          action: "package-publish"
+          pypi-verify-metadata: "true"

.gitignore

@@ -6,6 +6,7 @@
 .coverage
 .coverage.*
 coverage
+coverage.xml
 .tox
 settings.py
 .idea/*
@@ -18,3 +19,6 @@ build/*
 .DS_Store
 dist/*
 pip-wheel-metadata/
+.pytest_cache/*
+.venv/*
+.vscode/*

.travis.yml

@@ -1,94 +0,0 @@
-sudo: false
-language: python
-cache:
-  directories:
-    - $HOME/.cache/pip
-matrix:
-  include:
-    - env: TOX_ENV=py37
-      python: 3.7
-      dist: xenial
-      sudo: true
-      name: "Python 3.7 with Extensions"
-    - env: TOX_ENV=py37-no-ext
-      python: 3.7
-      dist: xenial
-      sudo: true
-      name: "Python 3.7 without Extensions"
-    - env: TOX_ENV=py38
-      python: 3.8
-      dist: xenial
-      sudo: true
-      name: "Python 3.8 with Extensions"
-    - env: TOX_ENV=py38-no-ext
-      python: 3.8
-      dist: xenial
-      sudo: true
-      name: "Python 3.8 without Extensions"
-    - env: TOX_ENV=py39
-      python: 3.9
-      dist: bionic
-      sudo: true
-      name: "Python 3.9 with Extensions"
-    - env: TOX_ENV=py39-no-ext
-      python: 3.9
-      dist: bionic
-      sudo: true
-      name: "Python 3.9 without Extensions"
-    - env: TOX_ENV=type-checking
-      python: 3.7
-      name: "Python 3.7 Type checks"
-    - env: TOX_ENV=type-checking
-      python: 3.8
-      name: "Python 3.8 Type checks"
-    - env: TOX_ENV=type-checking
-      python: 3.9
-      dist: bionic
-      name: "Python 3.9 Type checks"
-    - env: TOX_ENV=security
-      python: 3.7
-      dist: xenial
-      sudo: true
-      name: "Python 3.7 Bandit security scan"
-    - env: TOX_ENV=security
-      python: 3.8
-      dist: xenial
-      sudo: true
-      name: "Python 3.8 Bandit security scan"
-    - env: TOX_ENV=security
-      python: 3.9
-      dist: bionic
-      sudo: true
-      name: "Python 3.9 Bandit security scan"
-    - env: TOX_ENV=docs
-      python: 3.7
-      dist: xenial
-      sudo: true
-      name: "Python 3.7 Documentation tests"
-    - env: TOX_ENV=pyNightly
-      python: "nightly"
-      name: "Python nightly with Extensions"
-    - env: TOX_ENV=pyNightly-no-ext
-      python: "nightly"
-      name: "Python nightly without Extensions"
-  allow_failures:
-    - env: TOX_ENV=pyNightly
-      python: "nightly"
-      name: "Python nightly with Extensions"
-    - env: TOX_ENV=pyNightly-no-ext
-      python: "nightly"
-      name: "Python nightly without Extensions"
-install:
-  - pip install -U tox
-  - pip install codecov
-script: travis_retry tox -e $TOX_ENV
-after_success:
-  - codecov
-deploy:
-  provider: pypi
-  user: brewmaster
-  password:
-    secure: "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"
-  on:
-    tags: true
-  distributions: "sdist bdist_wheel"

CHANGELOG.rst

@@ -1,3 +1,114 @@
+.. note::
+
+  From v21.9, CHANGELOG files are maintained in ``./docs/sanic/releases``
+
+Version 21.6.1
+--------------
+
+Bugfixes
+********
+
+  * `#2178 <https://github.com/sanic-org/sanic/pull/2178>`_
+    Update sanic-routing to allow for better splitting of complex URI templates
+  * `#2183 <https://github.com/sanic-org/sanic/pull/2183>`_
+    Proper handling of chunked request bodies to resolve phantom 503 in logs
+  * `#2181 <https://github.com/sanic-org/sanic/pull/2181>`_
+    Resolve regression in exception logging
+  * `#2201 <https://github.com/sanic-org/sanic/pull/2201>`_
+    Cleanup request info in pipelined requests
+
+Version 21.6.0
+--------------
+
+Features
+********
+
+  * `#2094 <https://github.com/sanic-org/sanic/pull/2094>`_
+    Add ``response.eof()`` method for closing a stream in a handler
+  * `#2097 <https://github.com/sanic-org/sanic/pull/2097>`_
+    Allow case-insensitive HTTP Upgrade header
+  * `#2104 <https://github.com/sanic-org/sanic/pull/2104>`_
+    Explicit usage of CIMultiDict getters
+  * `#2109 <https://github.com/sanic-org/sanic/pull/2109>`_
+    Consistent use of error loggers
+  * `#2114 <https://github.com/sanic-org/sanic/pull/2114>`_
+    New ``client_ip`` access of connection info instance
+  * `#2119 <https://github.com/sanic-org/sanic/pull/2119>`_
+    Alternatate classes on instantiation for ``Config`` and ``Sanic.ctx``
+  * `#2133 <https://github.com/sanic-org/sanic/pull/2133>`_
+    Implement new version of AST router
+
+      * Proper differentiation between ``alpha`` and ``string`` param types
+      * Adds a ``slug`` param type, example: ``<foo:slug>``
+      * Deprecates ``<foo:string>`` in favor of ``<foo:str>``
+      * Deprecates ``<foo:number>`` in favor of ``<foo:float>``
+      * Adds a ``route.uri`` accessor
+  * `#2136 <https://github.com/sanic-org/sanic/pull/2136>`_
+    CLI improvements with new optional params
+  * `#2137 <https://github.com/sanic-org/sanic/pull/2137>`_
+    Add ``version_prefix`` to URL builders
+  * `#2140 <https://github.com/sanic-org/sanic/pull/2140>`_
+    Event autoregistration with ``EVENT_AUTOREGISTER``
+  * `#2146 <https://github.com/sanic-org/sanic/pull/2146>`_, `#2147 <https://github.com/sanic-org/sanic/pull/2147>`_
+    Require stricter names on  ``Sanic()`` and ``Blueprint()``
+  * `#2150 <https://github.com/sanic-org/sanic/pull/2150>`_
+    Infinitely reusable and nestable ``Blueprint`` and ``BlueprintGroup``
+  * `#2154 <https://github.com/sanic-org/sanic/pull/2154>`_
+    Upgrade ``websockets`` dependency to min version
+  * `#2155 <https://github.com/sanic-org/sanic/pull/2155>`_
+    Allow for maximum header sizes to be increased: ``REQUEST_MAX_HEADER_SIZE``
+  * `#2157 <https://github.com/sanic-org/sanic/pull/2157>`_
+    Allow app factory pattern in CLI
+  * `#2165 <https://github.com/sanic-org/sanic/pull/2165>`_
+    Change HTTP methods to enums
+  * `#2167 <https://github.com/sanic-org/sanic/pull/2167>`_
+    Allow auto-reloading on additional directories
+  * `#2168 <https://github.com/sanic-org/sanic/pull/2168>`_
+    Add simple HTTP server to CLI
+  * `#2170 <https://github.com/sanic-org/sanic/pull/2170>`_
+    Additional methods for attaching ``HTTPMethodView``
+
+Bugfixes
+********
+
+  * `#2091 <https://github.com/sanic-org/sanic/pull/2091>`_
+    Fix ``UserWarning`` in ASGI mode for missing ``__slots__``
+  * `#2099 <https://github.com/sanic-org/sanic/pull/2099>`_
+    Fix static request handler logging exception on 404
+  * `#2110 <https://github.com/sanic-org/sanic/pull/2110>`_
+    Fix request.args.pop removes parameters inconsistently
+  * `#2107 <https://github.com/sanic-org/sanic/pull/2107>`_
+    Fix type hinting for load_env
+  * `#2127 <https://github.com/sanic-org/sanic/pull/2127>`_
+    Make sure ASGI ws subprotocols is a list
+  * `#2128 <https://github.com/sanic-org/sanic/pull/2128>`_
+    Fix issue where Blueprint exception handlers do not consistently route to proper handler
+
+
+Deprecations and Removals
+*************************
+
+  * `#2156 <https://github.com/sanic-org/sanic/pull/2156>`_
+    Remove config value ``REQUEST_BUFFER_QUEUE_SIZE``
+  * `#2170 <https://github.com/sanic-org/sanic/pull/2170>`_
+    ``CompositionView`` deprecated and marked for removal in 21.12
+  * `#2172 <https://github.com/sanic-org/sanic/pull/2170>`_
+    Deprecate StreamingHTTPResponse
+
+Developer infrastructure
+************************
+
+  * `#2149 <https://github.com/sanic-org/sanic/pull/2149>`_
+    Remove Travis CI in favor of GitHub Actions
+
+Improved Documentation
+**********************
+
+  * `#2164 <https://github.com/sanic-org/sanic/pull/2164>`_
+    Fix typo in documentation
+  * `#2100 <https://github.com/sanic-org/sanic/pull/2100>`_
+    Remove documentation for non-existent arguments
+
 Version 21.3.2
 --------------
 

CONTRIBUTING.rst

@@ -19,7 +19,7 @@ a virtual environment already set up, then run:
 
 .. code-block:: bash
 
-   pip3 install -e . ".[dev]"
+   pip install -e ".[dev]"
 
 Dependency Changes
 ------------------
@@ -87,7 +87,7 @@ Permform ``flake8``\ , ``black`` and ``isort`` checks.
    tox -e lint
 
 Run type annotation checks
----------------
+--------------------------
 
 ``tox`` environment -> ``[testenv:type-checking]``
 

Makefile

@@ -49,6 +49,9 @@ test: clean
 test-coverage: clean
 	python setup.py test --pytest-args="--cov sanic --cov-report term --cov-append "
 
+view-coverage:
+	sanic ./coverage --simple
+
 install:
 	python setup.py install
 
@@ -85,8 +88,7 @@ docs-test: docs-clean
 	cd docs && make dummy
 
 docs-serve:
-	# python -m http.server --directory=./docs/_build/html 9999
-	sphinx-autobuild docs docs/_build/html --port 9999 --watch ./sanic
+	sphinx-autobuild docs docs/_build/html --port 9999 --watch ./
 
 changelog:
 	python scripts/changelog.py

README.rst

@@ -11,7 +11,7 @@ Sanic | Build fast. Run fast.
     :stub-columns: 1
 
     * - Build
-      - | |Build Status| |AppVeyor Build Status| |Codecov|
+      - | |Py39Test| |Py38Test| |Py37Test| |Codecov|
     * - Docs
       - | |UserGuide| |Documentation|
     * - Package
@@ -29,10 +29,12 @@ Sanic | Build fast. Run fast.
    :target: https://discord.gg/FARQzAEMAA
 .. |Codecov| image:: https://codecov.io/gh/sanic-org/sanic/branch/master/graph/badge.svg
     :target: https://codecov.io/gh/sanic-org/sanic
-.. |Build Status| image:: https://travis-ci.com/sanic-org/sanic.svg?branch=master
-   :target: https://travis-ci.com/sanic-org/sanic
-.. |AppVeyor Build Status| image:: https://ci.appveyor.com/api/projects/status/d8pt3ids0ynexi8c/branch/master?svg=true
-   :target: https://ci.appveyor.com/project/sanic-org/sanic
+.. |Py39Test| image:: https://github.com/sanic-org/sanic/actions/workflows/pr-python39.yml/badge.svg?branch=main
+   :target: https://github.com/sanic-org/sanic/actions/workflows/pr-python39.yml
+.. |Py38Test| image:: https://github.com/sanic-org/sanic/actions/workflows/pr-python38.yml/badge.svg?branch=main
+   :target: https://github.com/sanic-org/sanic/actions/workflows/pr-python38.yml
+.. |Py37Test| image:: https://github.com/sanic-org/sanic/actions/workflows/pr-python37.yml/badge.svg?branch=main
+   :target: https://github.com/sanic-org/sanic/actions/workflows/pr-python37.yml
 .. |Documentation| image:: https://readthedocs.org/projects/sanic/badge/?version=latest
    :target: http://sanic.readthedocs.io/en/latest/?badge=latest
 .. |PyPI| image:: https://img.shields.io/pypi/v/sanic.svg
@@ -75,17 +77,7 @@ The goal of the project is to provide a simple way to get up and running a highl
 Sponsor
 -------
 
-|Try CodeStream|
-
-.. |Try CodeStream| image:: https://alt-images.codestream.com/codestream_logo_sanicorg.png
-   :target: https://codestream.com/?utm_source=github&utm_campaign=sanicorg&utm_medium=banner
-   :alt: Try CodeStream
-
-Manage pull requests and conduct code reviews in your IDE with full source-tree context. Comment on any line, not just the diffs. Use jump-to-definition, your favorite keybindings, and code intelligence with more of your workflow.
-
-`Learn More <https://codestream.com/?utm_source=github&amp;utm_campaign=sanicorg&amp;utm_medium=banner>`_
-
-Thank you to our sponsor. Check out `open collective <https://opencollective.com/sanic-org>`_ to learn more about helping to fund Sanic.
+Check out `open collective <https://opencollective.com/sanic-org>`_ to learn more about helping to fund Sanic.
 
 Installation
 ------------

codecov.yml

@@ -1,14 +0,0 @@
-codecov:
-  require_ci_to_pass: no
-coverage:
-  precision: 3
-  round: nearest
-  status:
-    project:
-      default:
-        target: auto
-        threshold: 0.5%
-    patch:
-      default:
-        target: auto
-        threshold: 0.75%

docker/Dockerfile

@@ -1,28 +1,9 @@
-FROM alpine:3.7
+ARG BASE_IMAGE_TAG
 
-RUN apk add --no-cache --update \
-        curl \
-        bash \
-        build-base \
-        ca-certificates \
-        git \
-        bzip2-dev \
-        linux-headers \
-        ncurses-dev \
-        openssl \
-        openssl-dev \
-        readline-dev \
-        sqlite-dev
+FROM sanicframework/sanic-build:${BASE_IMAGE_TAG}
 
+RUN apk update
 RUN update-ca-certificates
-RUN rm -rf /var/cache/apk/*
 
-ENV PYENV_ROOT="/root/.pyenv"
-ENV PATH="$PYENV_ROOT/bin:$PATH"
-
-ADD . /app
-WORKDIR /app
-
-RUN /app/docker/bin/install_python.sh 3.5.4 3.6.4
-
-ENTRYPOINT ["./docker/bin/entrypoint.sh"]
+RUN pip install sanic
+RUN apk del build-base

docker/Dockerfile-base

@@ -0,0 +1,9 @@
+ARG PYTHON_VERSION
+
+FROM python:${PYTHON_VERSION}-alpine
+RUN apk update
+RUN apk add --no-cache --update build-base \
+        ca-certificates \
+        openssl
+RUN update-ca-certificates
+RUN rm -rf /var/cache/apk/*

docker/bin/entrypoint.sh

@@ -1,11 +0,0 @@
-#!/bin/bash
-set -e
-
-eval "$(pyenv init -)"
-eval "$(pyenv virtualenv-init -)"
-source /root/.pyenv/completions/pyenv.bash
-
-pip install tox
-
-exec $@
-

docker/bin/install_python.sh

@@ -1,17 +0,0 @@
-#!/bin/bash
-set -e
-
-export CFLAGS='-O2'
-export EXTRA_CFLAGS="-DTHREAD_STACK_SIZE=0x100000"
-
-curl -L https://raw.githubusercontent.com/pyenv/pyenv-installer/master/bin/pyenv-installer | bash
-eval "$(pyenv init -)"
-
-for ver in $@
-do
-    pyenv install $ver
-done
-
-pyenv global $@
-pip install --upgrade pip
-pyenv rehash

docs/conf.py

@@ -10,10 +10,8 @@
 import os
 import sys
 
-# Add support for auto-doc
-import recommonmark
 
-from recommonmark.transform import AutoStructify
+# Add support for auto-doc
 
 
 # Ensure that sanic is present in the path, to allow sphinx-apidoc to
@@ -26,7 +24,7 @@ import sanic
 
 # -- General configuration ------------------------------------------------
 
-extensions = ["sphinx.ext.autodoc", "recommonmark"]
+extensions = ["sphinx.ext.autodoc", "m2r2"]
 
 templates_path = ["_templates"]
 
@@ -162,20 +160,6 @@ autodoc_default_options = {
     "member-order": "groupwise",
 }
 
-
-# app setup hook
-def setup(app):
-    app.add_config_value(
-        "recommonmark_config",
-        {
-            "enable_eval_rst": True,
-            "enable_auto_doc_ref": False,
-        },
-        True,
-    )
-    app.add_transform(AutoStructify)
-
-
 html_theme_options = {
     "style_external_links": False,
 }

docs/sanic/api/app.rst

@@ -0,0 +1,17 @@
+Application
+===========
+
+sanic.app
+---------
+
+.. automodule:: sanic.app
+    :members:
+    :show-inheritance:
+    :inherited-members:
+
+sanic.config
+------------
+
+.. automodule:: sanic.config
+    :members:
+    :show-inheritance:

docs/sanic/api/blueprints.rst

@@ -0,0 +1,17 @@
+Blueprints
+==========
+
+sanic.blueprints
+----------------
+
+.. automodule:: sanic.blueprints
+    :members:
+    :show-inheritance:
+    :inherited-members:
+
+sanic.blueprint_group
+---------------------
+
+.. automodule:: sanic.blueprint_group
+    :members:
+    :special-members:

docs/sanic/api/core.rst

@@ -0,0 +1,47 @@
+Core
+====
+
+sanic.cookies
+-------------
+
+.. automodule:: sanic.cookies
+    :members:
+    :show-inheritance:
+
+
+sanic.handlers
+--------------
+
+.. automodule:: sanic.handlers
+    :members:
+    :show-inheritance:
+
+
+sanic.request
+-------------
+
+.. automodule:: sanic.request
+    :members:
+    :show-inheritance:
+
+sanic.response
+--------------
+
+.. automodule:: sanic.response
+    :members:
+    :show-inheritance:
+
+
+sanic.views
+-----------
+
+.. automodule:: sanic.views
+    :members:
+    :show-inheritance:
+
+sanic.websocket
+---------------
+
+.. automodule:: sanic.websocket
+    :members:
+    :show-inheritance:

docs/sanic/api/exceptions.rst

@@ -0,0 +1,16 @@
+Exceptions
+==========
+
+sanic.errorpages
+----------------
+
+.. automodule:: sanic.errorpages
+    :members:
+    :show-inheritance:
+
+sanic.exceptions
+----------------
+
+.. automodule:: sanic.exceptions
+    :members:
+    :show-inheritance:

docs/sanic/api/router.rst

@@ -0,0 +1,18 @@
+Routing
+=======
+
+sanic_routing models
+--------------------
+
+.. autoclass:: sanic_routing.route::Route
+    :members:
+
+.. autoclass:: sanic_routing.group::RouteGroup
+    :members:
+
+sanic.router
+------------
+
+.. automodule:: sanic.router
+    :members:
+    :show-inheritance:

docs/sanic/api/server.rst

@@ -0,0 +1,25 @@
+Sanic Server
+============
+
+sanic.http
+----------
+
+.. automodule:: sanic.http
+    :members:
+    :show-inheritance:
+
+
+sanic.server
+------------
+
+.. automodule:: sanic.server
+    :members:
+    :show-inheritance:
+
+
+sanic.worker
+------------
+
+.. automodule:: sanic.worker
+    :members:
+    :show-inheritance:

docs/sanic/api/utility.rst

@@ -0,0 +1,16 @@
+Utility
+=======
+
+sanic.compat
+------------
+
+.. automodule:: sanic.compat
+    :members:
+    :show-inheritance:
+
+sanic.log
+---------
+
+.. automodule:: sanic.log
+    :members:
+    :show-inheritance:

docs/sanic/api_reference.rst

@@ -1,132 +1,13 @@
 📑 API Reference
 ================
 
-sanic.app
----------
+.. toctree::
+   :maxdepth: 2
 
-.. automodule:: sanic.app
-    :members:
-    :show-inheritance:
-    :inherited-members:
-
-sanic.blueprints
-----------------
-
-.. automodule:: sanic.blueprints
-    :members:
-    :show-inheritance:
-    :inherited-members:
-
-sanic.blueprint_group
----------------------
-
-.. automodule:: sanic.blueprint_group
-    :members:
-    :special-members:
-
-
-sanic.compat
-------------
-
-.. automodule:: sanic.compat
-    :members:
-    :show-inheritance:
-
-sanic.config
-------------
-
-.. automodule:: sanic.config
-    :members:
-    :show-inheritance:
-
-sanic.cookies
--------------
-
-.. automodule:: sanic.cookies
-    :members:
-    :show-inheritance:
-
-sanic.errorpages
-----------------
-
-.. automodule:: sanic.errorpages
-    :members:
-    :show-inheritance:
-
-sanic.exceptions
-----------------
-
-.. automodule:: sanic.exceptions
-    :members:
-    :show-inheritance:
-
-sanic.handlers
---------------
-
-.. automodule:: sanic.handlers
-    :members:
-    :show-inheritance:
-
-sanic.http
-----------
-
-.. automodule:: sanic.http
-    :members:
-    :show-inheritance:
-
-sanic.log
----------
-
-.. automodule:: sanic.log
-    :members:
-    :show-inheritance:
-
-sanic.request
--------------
-
-.. automodule:: sanic.request
-    :members:
-    :show-inheritance:
-
-sanic.response
---------------
-
-.. automodule:: sanic.response
-    :members:
-    :show-inheritance:
-
-sanic.router
-------------
-
-.. automodule:: sanic.router
-    :members:
-    :show-inheritance:
-
-sanic.server
-------------
-
-.. automodule:: sanic.server
-    :members:
-    :show-inheritance:
-
-
-sanic.views
------------
-
-.. automodule:: sanic.views
-    :members:
-    :show-inheritance:
-
-sanic.websocket
----------------
-
-.. automodule:: sanic.websocket
-    :members:
-    :show-inheritance:
-
-sanic.worker
-------------
-
-.. automodule:: sanic.worker
-    :members:
-    :show-inheritance:
+   api/app
+   api/blueprints
+   api/core
+   api/exceptions
+   api/router
+   api/server
+   api/utility

docs/sanic/changelog.rst

@@ -1,4 +1,6 @@
 📜 Changelog
 ============
 
+.. mdinclude:: ./releases/21.9.md
+
 .. include:: ../../CHANGELOG.rst

docs/sanic/releases/21.9.md

@@ -0,0 +1,40 @@
+## Version 21.9
+
+### Features
+- [#2158](https://github.com/sanic-org/sanic/pull/2158), [#2248](https://github.com/sanic-org/sanic/pull/2248) Complete overhaul of I/O to websockets
+- [#2160](https://github.com/sanic-org/sanic/pull/2160) Add new 17 signals into server and request lifecycles
+- [#2162](https://github.com/sanic-org/sanic/pull/2162) Smarter `auto` fallback formatting upon exception
+- [#2184](https://github.com/sanic-org/sanic/pull/2184) Introduce implementation for copying a Blueprint
+- [#2200](https://github.com/sanic-org/sanic/pull/2200) Accept header parsing
+- [#2207](https://github.com/sanic-org/sanic/pull/2207) Log remote address if available
+- [#2209](https://github.com/sanic-org/sanic/pull/2209) Add convenience methods to BP groups
+- [#2216](https://github.com/sanic-org/sanic/pull/2216) Add default messages to SanicExceptions
+- [#2225](https://github.com/sanic-org/sanic/pull/2225) Type annotation convenience for annotated handlers with path parameters
+- [#2236](https://github.com/sanic-org/sanic/pull/2236) Allow Falsey (but not-None) responses from route handlers
+- [#2238](https://github.com/sanic-org/sanic/pull/2238) Add `exception` decorator to Blueprint Groups
+- [#2244](https://github.com/sanic-org/sanic/pull/2244) Explicit static directive for serving file or dir (ex: `static(..., resource_type="file")`)
+- [#2245](https://github.com/sanic-org/sanic/pull/2245) Close HTTP loop when connection task cancelled
+
+### Bugfixes
+- [#2188](https://github.com/sanic-org/sanic/pull/2188) Fix the handling of the end of a chunked request
+- [#2195](https://github.com/sanic-org/sanic/pull/2195) Resolve unexpected error handling on static requests
+- [#2208](https://github.com/sanic-org/sanic/pull/2208) Make blueprint-based exceptions attach and trigger in a more intuitive manner
+- [#2211](https://github.com/sanic-org/sanic/pull/2211) Fixed for handling exceptions of asgi app call
+- [#2213](https://github.com/sanic-org/sanic/pull/2213) Fix bug where ws exceptions not being logged
+- [#2231](https://github.com/sanic-org/sanic/pull/2231) Cleaner closing of tasks by using `abort()` in strategic places to avoid dangling sockets
+- [#2247](https://github.com/sanic-org/sanic/pull/2247) Fix logging of auto-reload status in debug mode
+- [#2246](https://github.com/sanic-org/sanic/pull/2246) Account for BP with exception handler but no routes
+
+### Developer infrastructure  
+- [#2194](https://github.com/sanic-org/sanic/pull/2194) HTTP unit tests with raw client
+- [#2199](https://github.com/sanic-org/sanic/pull/2199) Switch to codeclimate
+- [#2214](https://github.com/sanic-org/sanic/pull/2214) Try Reopening Windows Tests
+- [#2229](https://github.com/sanic-org/sanic/pull/2229) Refactor `HttpProtocol` into a base class
+- [#2230](https://github.com/sanic-org/sanic/pull/2230) Refactor `server.py` into multi-file module
+
+### Miscellaneous
+- [#2173](https://github.com/sanic-org/sanic/pull/2173) Remove Duplicated Dependencies and PEP 517 Support 
+- [#2193](https://github.com/sanic-org/sanic/pull/2193), [#2196](https://github.com/sanic-org/sanic/pull/2196), [#2217](https://github.com/sanic-org/sanic/pull/2217) Type annotation changes
+
+
+

examples/run_async_advanced.py

@@ -1,29 +1,44 @@
-from sanic import Sanic
-from sanic import response
-from signal import signal, SIGINT
 import asyncio
+
+from signal import SIGINT, signal
+
 import uvloop
 
+from sanic import Sanic, response
+from sanic.server import AsyncioServer
+
+
 app = Sanic(__name__)
 
-@app.listener('after_server_start')
+
+@app.listener("after_server_start")
 async def after_start_test(app, loop):
     print("Async Server Started!")
 
+
 @app.route("/")
 async def test(request):
     return response.json({"answer": "42"})
 
+
 asyncio.set_event_loop(uvloop.new_event_loop())
-serv_coro = app.create_server(host="0.0.0.0", port=8000, return_asyncio_server=True)
+serv_coro = app.create_server(
+    host="0.0.0.0", port=8000, return_asyncio_server=True
+)
 loop = asyncio.get_event_loop()
 serv_task = asyncio.ensure_future(serv_coro, loop=loop)
 signal(SIGINT, lambda s, f: loop.stop())
-server = loop.run_until_complete(serv_task)
+server: AsyncioServer = loop.run_until_complete(serv_task)  # type: ignore
+server.startup()
+
+# When using app.run(), this actually triggers before the serv_coro.
+# But, in this example, we are using the convenience method, even if it is
+# out of order.
+server.before_start()
 server.after_start()
 try:
     loop.run_forever()
-except KeyboardInterrupt as e:
+except KeyboardInterrupt:
     loop.stop()
 finally:
     server.before_stop()

examples/websocket.py

@@ -1,13 +1,14 @@
 from sanic import Sanic
-from sanic.response import file
+from sanic.response import redirect
 
 app = Sanic(__name__)
 
 
-@app.route('/')
-async def index(request):
-    return await file('websocket.html')
+app.static('index.html', "websocket.html")
 
+@app.route('/')
+def index(request):
+    return redirect("index.html")
 
 @app.websocket('/feed')
 async def feed(request, ws):

hack/Dockerfile

@@ -0,0 +1,6 @@
+FROM catthehacker/ubuntu:act-latest
+SHELL [ "/bin/bash", "-c" ]
+ENTRYPOINT []
+RUN apt-get update
+RUN apt-get install gcc -y
+RUN apt-get install -y --no-install-recommends g++

pyproject.toml

@@ -0,0 +1,3 @@
+[build-system]
+requires = ["setuptools", "wheel"]
+build-backend = "setuptools.build_meta"

sanic/__init__.py

@@ -1,6 +1,7 @@
 from sanic.__version__ import __version__
 from sanic.app import Sanic
 from sanic.blueprints import Blueprint
+from sanic.constants import HTTPMethod
 from sanic.request import Request
 from sanic.response import HTTPResponse, html, json, text
 
@@ -9,6 +10,7 @@ __all__ = (
     "__version__",
     "Sanic",
     "Blueprint",
+    "HTTPMethod",
     "HTTPResponse",
     "Request",
     "html",

sanic/__main__.py

@@ -1,21 +1,25 @@
 import os
 import sys
 
-from argparse import ArgumentParser, RawDescriptionHelpFormatter
+from argparse import ArgumentParser, RawTextHelpFormatter
 from importlib import import_module
+from pathlib import Path
 from typing import Any, Dict, Optional
 
+from sanic_routing import __version__ as __routing_version__  # type: ignore
+
 from sanic import __version__
 from sanic.app import Sanic
 from sanic.config import BASE_LOGO
-from sanic.log import logger
+from sanic.log import error_logger
+from sanic.simple import create_simple_server
 
 
 class SanicArgumentParser(ArgumentParser):
     def add_bool_arguments(self, *args, **kwargs):
         group = self.add_mutually_exclusive_group()
         group.add_argument(*args, action="store_true", **kwargs)
-        kwargs["help"] = "no " + kwargs["help"]
+        kwargs["help"] = f"no {kwargs['help']}\n "
         group.add_argument(
             "--no-" + args[0][2:], *args[1:], action="store_false", **kwargs
         )
@@ -25,7 +29,30 @@ def main():
     parser = SanicArgumentParser(
         prog="sanic",
         description=BASE_LOGO,
-        formatter_class=RawDescriptionHelpFormatter,
+        formatter_class=lambda prog: RawTextHelpFormatter(
+            prog, max_help_position=33
+        ),
+    )
+    parser.add_argument(
+        "-v",
+        "--version",
+        action="version",
+        version=f"Sanic {__version__}; Routing {__routing_version__}",
+    )
+    parser.add_argument(
+        "--factory",
+        action="store_true",
+        help=(
+            "Treat app as an application factory, "
+            "i.e. a () -> <Sanic app> callable"
+        ),
+    )
+    parser.add_argument(
+        "-s",
+        "--simple",
+        dest="simple",
+        action="store_true",
+        help="Run Sanic as a Simple Server (module arg should be a path)\n ",
     )
     parser.add_argument(
         "-H",
@@ -33,7 +60,7 @@ def main():
         dest="host",
         type=str,
         default="127.0.0.1",
-        help="host address [default 127.0.0.1]",
+        help="Host address [default 127.0.0.1]",
     )
     parser.add_argument(
         "-p",
@@ -41,7 +68,7 @@ def main():
         dest="port",
         type=int,
         default=8000,
-        help="port to serve on [default 8000]",
+        help="Port to serve on [default 8000]",
     )
     parser.add_argument(
         "-u",
@@ -49,13 +76,16 @@ def main():
         dest="unix",
         type=str,
         default="",
-        help="location of unix socket",
+        help="location of unix socket\n ",
     )
     parser.add_argument(
-        "--cert", dest="cert", type=str, help="location of certificate for SSL"
+        "--cert", dest="cert", type=str, help="Location of certificate for SSL"
     )
     parser.add_argument(
-        "--key", dest="key", type=str, help="location of keyfile for SSL."
+        "--key", dest="key", type=str, help="location of keyfile for SSL\n "
+    )
+    parser.add_bool_arguments(
+        "--access-logs", dest="access_log", help="display access logs"
     )
     parser.add_argument(
         "-w",
@@ -63,20 +93,31 @@ def main():
         dest="workers",
         type=int,
         default=1,
-        help="number of worker processes [default 1]",
+        help="number of worker processes [default 1]\n ",
     )
-    parser.add_argument("--debug", dest="debug", action="store_true")
-    parser.add_bool_arguments(
-        "--access-logs", dest="access_log", help="display access logs"
+    parser.add_argument("-d", "--debug", dest="debug", action="store_true")
+    parser.add_argument(
+        "-r",
+        "--reload",
+        "--auto-reload",
+        dest="auto_reload",
+        action="store_true",
+        help="Watch source directory for file changes and reload on changes",
     )
     parser.add_argument(
-        "-v",
-        "--version",
-        action="version",
-        version=f"Sanic {__version__}",
+        "-R",
+        "--reload-dir",
+        dest="path",
+        action="append",
+        help="Extra directories to watch and reload on changes\n ",
     )
     parser.add_argument(
-        "module", help="path to your Sanic app. Example: path.to.server:app"
+        "module",
+        help=(
+            "Path to your Sanic app. Example: path.to.server:app\n"
+            "If running a Simple Server, path to directory to serve. "
+            "Example: ./\n"
+        ),
     )
     args = parser.parse_args()
 
@@ -85,47 +126,71 @@ def main():
         if module_path not in sys.path:
             sys.path.append(module_path)
 
-        if ":" in args.module:
-            module_name, app_name = args.module.rsplit(":", 1)
+        if args.simple:
+            path = Path(args.module)
+            app = create_simple_server(path)
         else:
-            module_parts = args.module.split(".")
-            module_name = ".".join(module_parts[:-1])
-            app_name = module_parts[-1]
+            delimiter = ":" if ":" in args.module else "."
+            module_name, app_name = args.module.rsplit(delimiter, 1)
 
-        module = import_module(module_name)
-        app = getattr(module, app_name, None)
-        app_name = type(app).__name__
+            if app_name.endswith("()"):
+                args.factory = True
+                app_name = app_name[:-2]
 
-        if not isinstance(app, Sanic):
-            raise ValueError(
-                f"Module is not a Sanic app, it is a {app_name}.  "
-                f"Perhaps you meant {args.module}.app?"
-            )
+            module = import_module(module_name)
+            app = getattr(module, app_name, None)
+            if args.factory:
+                app = app()
+
+            app_type_name = type(app).__name__
+
+            if not isinstance(app, Sanic):
+                raise ValueError(
+                    f"Module is not a Sanic app, it is a {app_type_name}.  "
+                    f"Perhaps you meant {args.module}.app?"
+                )
         if args.cert is not None or args.key is not None:
-            ssl = {
+            ssl: Optional[Dict[str, Any]] = {
                 "cert": args.cert,
                 "key": args.key,
-            }  # type: Optional[Dict[str, Any]]
+            }
         else:
             ssl = None
 
-        app.run(
-            host=args.host,
-            port=args.port,
-            unix=args.unix,
-            workers=args.workers,
-            debug=args.debug,
-            access_log=args.access_log,
-            ssl=ssl,
-        )
+        kwargs = {
+            "host": args.host,
+            "port": args.port,
+            "unix": args.unix,
+            "workers": args.workers,
+            "debug": args.debug,
+            "access_log": args.access_log,
+            "ssl": ssl,
+        }
+        if args.auto_reload:
+            kwargs["auto_reload"] = True
+
+        if args.path:
+            if args.auto_reload or args.debug:
+                kwargs["reload_dir"] = args.path
+            else:
+                error_logger.warning(
+                    "Ignoring '--reload-dir' since auto reloading was not "
+                    "enabled. If you would like to watch directories for "
+                    "changes, consider using --debug or --auto-reload."
+                )
+
+        app.run(**kwargs)
     except ImportError as e:
-        logger.error(
-            f"No module named {e.name} found.\n"
-            f"  Example File: project/sanic_server.py -> app\n"
-            f"  Example Module: project.sanic_server.app"
-        )
+        if module_name.startswith(e.name):
+            error_logger.error(
+                f"No module named {e.name} found.\n"
+                "  Example File: project/sanic_server.py -> app\n"
+                "  Example Module: project.sanic_server.app"
+            )
+        else:
+            raise e
     except ValueError:
-        logger.exception("Failed to run app")
+        error_logger.exception("Failed to run app")
 
 
 if __name__ == "__main__":

sanic/__version__.py

@@ -1 +1 @@
-__version__ = "21.3.2"
+__version__ = "21.9.1"

sanic/app.py

@@ -1,9 +1,12 @@
+from __future__ import annotations
+
 import logging
 import logging.config
 import os
 import re
 
 from asyncio import (
+    AbstractEventLoop,
     CancelledError,
     Protocol,
     ensure_future,
@@ -14,12 +17,14 @@ from asyncio.futures import Future
 from collections import defaultdict, deque
 from functools import partial
 from inspect import isawaitable
+from pathlib import Path
 from socket import socket
 from ssl import Purpose, SSLContext, create_default_context
 from traceback import format_exc
 from types import SimpleNamespace
 from typing import (
     Any,
+    AnyStr,
     Awaitable,
     Callable,
     Coroutine,
@@ -29,6 +34,7 @@ from typing import (
     List,
     Optional,
     Set,
+    Tuple,
     Type,
     Union,
 )
@@ -43,7 +49,7 @@ from sanic.asgi import ASGIApp
 from sanic.base import BaseSanic
 from sanic.blueprint_group import BlueprintGroup
 from sanic.blueprints import Blueprint
-from sanic.config import BASE_LOGO, Config
+from sanic.config import BASE_LOGO, SANIC_PREFIX, Config
 from sanic.exceptions import (
     InvalidUsage,
     SanicException,
@@ -68,19 +74,29 @@ from sanic.router import Router
 from sanic.server import AsyncioServer, HttpProtocol
 from sanic.server import Signal as ServerSignal
 from sanic.server import serve, serve_multiple, serve_single
+from sanic.server.protocols.websocket_protocol import WebSocketProtocol
+from sanic.server.websockets.impl import ConnectionClosed
 from sanic.signals import Signal, SignalRouter
-from sanic.websocket import ConnectionClosed, WebSocketProtocol
+from sanic.touchup import TouchUp, TouchUpMeta
 
 
-class Sanic(BaseSanic):
+class Sanic(BaseSanic, metaclass=TouchUpMeta):
     """
     The main application instance
     """
 
+    __touchup__ = (
+        "handle_request",
+        "handle_exception",
+        "_run_response_middleware",
+        "_run_request_middleware",
+    )
     __fake_slots__ = (
+        "_asgi_app",
         "_app_registry",
         "_asgi_client",
         "_blueprint_order",
+        "_delayed_tasks",
         "_future_routes",
         "_future_statics",
         "_future_middleware",
@@ -89,6 +105,7 @@ class Sanic(BaseSanic):
         "_future_signals",
         "_test_client",
         "_test_manager",
+        "auto_reload",
         "asgi",
         "blueprints",
         "config",
@@ -103,6 +120,7 @@ class Sanic(BaseSanic):
         "name",
         "named_request_middleware",
         "named_response_middleware",
+        "reload_dirs",
         "request_class",
         "request_middleware",
         "response_middleware",
@@ -121,45 +139,55 @@ class Sanic(BaseSanic):
     def __init__(
         self,
         name: str = None,
+        config: Optional[Config] = None,
+        ctx: Optional[Any] = None,
         router: Optional[Router] = None,
         signal_router: Optional[SignalRouter] = None,
         error_handler: Optional[ErrorHandler] = None,
-        load_env: bool = True,
+        load_env: Union[bool, str] = True,
+        env_prefix: Optional[str] = SANIC_PREFIX,
         request_class: Optional[Type[Request]] = None,
         strict_slashes: bool = False,
         log_config: Optional[Dict[str, Any]] = None,
         configure_logging: bool = True,
         register: Optional[bool] = None,
-        dumps: Optional[Callable[..., str]] = None,
+        dumps: Optional[Callable[..., AnyStr]] = None,
     ) -> None:
-        super().__init__()
+        super().__init__(name=name)
 
-        if name is None:
-            raise SanicException(
-                "Sanic instance cannot be unnamed. "
-                "Please use Sanic(name='your_application_name') instead.",
-            )
         # logging
         if configure_logging:
             logging.config.dictConfig(log_config or LOGGING_CONFIG_DEFAULTS)
 
+        if config and (load_env is not True or env_prefix != SANIC_PREFIX):
+            raise SanicException(
+                "When instantiating Sanic with config, you cannot also pass "
+                "load_env or env_prefix"
+            )
+
         self._asgi_client = None
         self._blueprint_order: List[Blueprint] = []
+        self._delayed_tasks: List[str] = []
         self._test_client = None
         self._test_manager = None
         self.asgi = False
+        self.auto_reload = False
         self.blueprints: Dict[str, Blueprint] = {}
-        self.config = Config(load_env=load_env)
+        self.config = config or Config(
+            load_env=load_env, env_prefix=env_prefix
+        )
         self.configure_logging = configure_logging
-        self.ctx = SimpleNamespace()
+        self.ctx = ctx or SimpleNamespace()
         self.debug = None
-        self.error_handler = error_handler or ErrorHandler()
+        self.error_handler = error_handler or ErrorHandler(
+            fallback=self.config.FALLBACK_ERROR_FORMAT,
+        )
         self.is_running = False
         self.is_stopping = False
         self.listeners: Dict[str, List[ListenerType]] = defaultdict(list)
-        self.name = name
         self.named_request_middleware: Dict[str, Deque[MiddlewareType]] = {}
         self.named_response_middleware: Dict[str, Deque[MiddlewareType]] = {}
+        self.reload_dirs: Set[Path] = set()
         self.request_class = request_class
         self.request_middleware: Deque[MiddlewareType] = deque()
         self.response_middleware: Deque[MiddlewareType] = deque()
@@ -175,14 +203,14 @@ class Sanic(BaseSanic):
 
         if register is not None:
             self.config.REGISTER = register
-
         if self.config.REGISTER:
             self.__class__.register_app(self)
 
         self.router.ctx.app = self
+        self.signal_router.ctx.app = self
 
         if dumps:
-            BaseHTTPResponse._dumps = dumps
+            BaseHTTPResponse._dumps = dumps  # type: ignore
 
     @property
     def loop(self):
@@ -220,9 +248,12 @@ class Sanic(BaseSanic):
             loop = self.loop  # Will raise SanicError if loop is not started
             self._loop_add_task(task, self, loop)
         except SanicException:
-            self.listener("before_server_start")(
-                partial(self._loop_add_task, task)
-            )
+            task_name = f"sanic.delayed_task.{hash(task)}"
+            if not self._delayed_tasks:
+                self.after_server_start(partial(self.dispatch_delayed_tasks))
+
+            self.signal(task_name)(partial(self.run_delayed_task, task=task))
+            self._delayed_tasks.append(task_name)
 
     def register_listener(self, listener: Callable, event: str) -> Any:
         """
@@ -234,12 +265,20 @@ class Sanic(BaseSanic):
         """
 
         try:
-            _event = ListenerEvent(event)
-        except ValueError:
-            valid = ", ".join(ListenerEvent.__members__.values())
+            _event = ListenerEvent[event.upper()]
+        except (ValueError, AttributeError):
+            valid = ", ".join(
+                map(lambda x: x.lower(), ListenerEvent.__members__.keys())
+            )
             raise InvalidUsage(f"Invalid event: {event}. Use one of: {valid}")
 
-        self.listeners[_event].append(listener)
+        if "." in _event:
+            self.signal(_event.value)(
+                partial(self._listener, listener=listener)
+            )
+        else:
+            self.listeners[_event.value].append(listener)
+
         return listener
 
     def register_middleware(self, middleware, attach_to: str = "request"):
@@ -298,7 +337,11 @@ class Sanic(BaseSanic):
                     self.named_response_middleware[_rn].appendleft(middleware)
         return middleware
 
-    def _apply_exception_handler(self, handler: FutureException):
+    def _apply_exception_handler(
+        self,
+        handler: FutureException,
+        route_names: Optional[List[str]] = None,
+    ):
         """Decorate a function to be registered as a handler for exceptions
 
         :param exceptions: exceptions
@@ -308,9 +351,9 @@ class Sanic(BaseSanic):
         for exception in handler.exceptions:
             if isinstance(exception, (tuple, list)):
                 for e in exception:
-                    self.error_handler.add(e, handler.handler)
+                    self.error_handler.add(e, handler.handler, route_names)
             else:
-                self.error_handler.add(exception, handler.handler)
+                self.error_handler.add(exception, handler.handler, route_names)
         return handler.handler
 
     def _apply_listener(self, listener: FutureListener):
@@ -367,18 +410,32 @@ class Sanic(BaseSanic):
         *,
         condition: Optional[Dict[str, str]] = None,
         context: Optional[Dict[str, Any]] = None,
+        fail_not_found: bool = True,
+        inline: bool = False,
+        reverse: bool = False,
     ) -> Coroutine[Any, Any, Awaitable[Any]]:
         return self.signal_router.dispatch(
             event,
             context=context,
             condition=condition,
+            inline=inline,
+            reverse=reverse,
+            fail_not_found=fail_not_found,
         )
 
-    def event(self, event: str, timeout: Optional[Union[int, float]] = None):
+    async def event(
+        self, event: str, timeout: Optional[Union[int, float]] = None
+    ):
         signal = self.signal_router.name_index.get(event)
         if not signal:
-            raise NotFound("Could not find signal %s" % event)
-        return wait_for(signal.ctx.event.wait(), timeout=timeout)
+            if self.config.EVENT_AUTOREGISTER:
+                self.signal_router.reset()
+                self.add_signal(None, event)
+                signal = self.signal_router.name_index[event]
+                self.signal_router.finalize()
+            else:
+                raise NotFound("Could not find signal %s" % event)
+        return await wait_for(signal.ctx.event.wait(), timeout=timeout)
 
     def enable_websocket(self, enable=True):
         """Enable or disable the support for websocket.
@@ -393,7 +450,13 @@ class Sanic(BaseSanic):
 
         self.websocket_enabled = enable
 
-    def blueprint(self, blueprint, **options):
+    def blueprint(
+        self,
+        blueprint: Union[
+            Blueprint, List[Blueprint], Tuple[Blueprint], BlueprintGroup
+        ],
+        **options: Any,
+    ):
         """Register a blueprint on the application.
 
         :param blueprint: Blueprint object or (list, tuple) thereof
@@ -402,7 +465,33 @@ class Sanic(BaseSanic):
         """
         if isinstance(blueprint, (list, tuple, BlueprintGroup)):
             for item in blueprint:
-                self.blueprint(item, **options)
+                params = {**options}
+                if isinstance(blueprint, BlueprintGroup):
+                    if blueprint.url_prefix:
+                        merge_from = [
+                            options.get("url_prefix", ""),
+                            blueprint.url_prefix,
+                        ]
+                        if not isinstance(item, BlueprintGroup):
+                            merge_from.append(item.url_prefix or "")
+                        merged_prefix = "/".join(
+                            u.strip("/") for u in merge_from
+                        ).rstrip("/")
+                        params["url_prefix"] = f"/{merged_prefix}"
+
+                    for _attr in ["version", "strict_slashes"]:
+                        if getattr(item, _attr) is None:
+                            params[_attr] = getattr(
+                                blueprint, _attr
+                            ) or options.get(_attr)
+                    if item.version_prefix == "/v":
+                        if blueprint.version_prefix == "/v":
+                            params["version_prefix"] = options.get(
+                                "version_prefix"
+                            )
+                        else:
+                            params["version_prefix"] = blueprint.version_prefix
+                self.blueprint(item, **params)
             return
         if blueprint.name in self.blueprints:
             assert self.blueprints[blueprint.name] is blueprint, (
@@ -567,7 +656,12 @@ class Sanic(BaseSanic):
             # determine if the parameter supplied by the caller
             # passes the test in the URL
             if param_info.pattern:
-                passes_pattern = param_info.pattern.match(supplied_param)
+                pattern = (
+                    param_info.pattern[1]
+                    if isinstance(param_info.pattern, tuple)
+                    else param_info.pattern
+                )
+                passes_pattern = pattern.match(supplied_param)
                 if not passes_pattern:
                     if param_info.cast != str:
                         msg = (
@@ -575,13 +669,13 @@ class Sanic(BaseSanic):
                             f"for parameter `{param_info.name}` does "
                             "not match pattern for type "
                             f"`{param_info.cast.__name__}`: "
-                            f"{param_info.pattern.pattern}"
+                            f"{pattern.pattern}"
                         )
                     else:
                         msg = (
                             f'Value "{supplied_param}" for parameter '
                             f"`{param_info.name}` does not satisfy "
-                            f"pattern {param_info.pattern.pattern}"
+                            f"pattern {pattern.pattern}"
                         )
                     raise URLBuildError(msg)
 
@@ -602,7 +696,7 @@ class Sanic(BaseSanic):
 
     async def handle_exception(
         self, request: Request, exception: BaseException
-    ):
+    ):  # no cov
         """
         A handler that catches specific exceptions and outputs a response.
 
@@ -612,6 +706,12 @@ class Sanic(BaseSanic):
         :type exception: BaseException
         :raises ServerError: response 500
         """
+        await self.dispatch(
+            "http.lifecycle.exception",
+            inline=True,
+            context={"request": request, "exception": exception},
+        )
+
         # -------------------------------------------- #
         # Request Middleware
         # -------------------------------------------- #
@@ -658,41 +758,60 @@ class Sanic(BaseSanic):
                 f"Invalid response type {response!r} (need HTTPResponse)"
             )
 
-    async def handle_request(self, request: Request):
+    async def handle_request(self, request: Request):  # no cov
         """Take a request from the HTTP Server and return a response object
         to be sent back The HTTP Server only expects a response object, so
         exception handling must be done here
 
         :param request: HTTP Request object
-        :param write_callback: Synchronous response function to be
-            called with the response as the only argument
-        :param stream_callback: Coroutine that handles streaming a
-            StreamingHTTPResponse if produced by the handler.
-
         :return: Nothing
         """
+        await self.dispatch(
+            "http.lifecycle.handle",
+            inline=True,
+            context={"request": request},
+        )
+
         # Define `response` var here to remove warnings about
         # allocation before assignment below.
         response = None
         try:
+
+            await self.dispatch(
+                "http.routing.before",
+                inline=True,
+                context={"request": request},
+            )
             # Fetch handler from router
             route, handler, kwargs = self.router.get(
-                request.path, request.method, request.headers.get("host")
+                request.path,
+                request.method,
+                request.headers.getone("host", None),
             )
 
-            request._match_info = kwargs
+            request._match_info = {**kwargs}
             request.route = route
 
+            await self.dispatch(
+                "http.routing.after",
+                inline=True,
+                context={
+                    "request": request,
+                    "route": route,
+                    "kwargs": kwargs,
+                    "handler": handler,
+                },
+            )
+
             if (
-                request.stream.request_body  # type: ignore
+                request.stream
+                and request.stream.request_body
                 and not route.ctx.ignore_body
             ):
 
                 if hasattr(handler, "is_stream"):
                     # Streaming handler: lift the size limit
-                    request.stream.request_max_size = float(  # type: ignore
-                        "inf"
-                    )
+                    request.stream.request_max_size = float("inf")
                 else:
                     # Non-streaming handler: preload body
                     await request.receive_body()
@@ -719,23 +838,28 @@ class Sanic(BaseSanic):
                     )
 
                 # Run response handler
-                response = handler(request, **kwargs)
+                response = handler(request, **request.match_info)
                 if isawaitable(response):
                     response = await response
 
-            if response:
+            if response is not None:
                 response = await request.respond(response)
-            else:
+            elif not hasattr(handler, "is_websocket"):
                 response = request.stream.response  # type: ignore
-            # Make sure that response is finished / run StreamingHTTP callback
 
+            # Make sure that response is finished / run StreamingHTTP callback
             if isinstance(response, BaseHTTPResponse):
+                await self.dispatch(
+                    "http.lifecycle.response",
+                    inline=True,
+                    context={
+                        "request": request,
+                        "response": response,
+                    },
+                )
                 await response.send(end_stream=True)
             else:
-                try:
-                    # Fastest method for checking if the property exists
-                    handler.is_websocket  # type: ignore
-                except AttributeError:
+                if not hasattr(handler, "is_websocket"):
                     raise ServerError(
                         f"Invalid response type {response!r} "
                         "(need HTTPResponse)"
@@ -750,22 +874,11 @@ class Sanic(BaseSanic):
     async def _websocket_handler(
         self, handler, request, *args, subprotocols=None, **kwargs
     ):
-        request.app = self
-        if not getattr(handler, "__blueprintname__", False):
-            request._name = handler.__name__
-        else:
-            request._name = (
-                getattr(handler, "__blueprintname__", "") + handler.__name__
-            )
-
-            pass
-
         if self.asgi:
             ws = request.transport.get_websocket_connection()
+            await ws.accept(subprotocols)
         else:
             protocol = request.transport.get_protocol()
-            protocol.app = self
-
             ws = await protocol.websocket_handshake(request, subprotocols)
 
         # schedule the application handler
@@ -773,13 +886,19 @@ class Sanic(BaseSanic):
         # needs to be cancelled due to the server being stopped
         fut = ensure_future(handler(request, ws, *args, **kwargs))
         self.websocket_tasks.add(fut)
+        cancelled = False
         try:
             await fut
+        except Exception as e:
+            self.error_handler.log(request, e)
         except (CancelledError, ConnectionClosed):
-            pass
+            cancelled = True
         finally:
             self.websocket_tasks.remove(fut)
-            await ws.close()
+            if cancelled:
+                ws.end_connection(1000)
+            else:
+                await ws.close()
 
     # -------------------------------------------------------------------- #
     # Testing
@@ -825,7 +944,7 @@ class Sanic(BaseSanic):
         *,
         debug: bool = False,
         auto_reload: Optional[bool] = None,
-        ssl: Union[dict, SSLContext, None] = None,
+        ssl: Union[Dict[str, str], SSLContext, None] = None,
         sock: Optional[socket] = None,
         workers: int = 1,
         protocol: Optional[Type[Protocol]] = None,
@@ -834,6 +953,7 @@ class Sanic(BaseSanic):
         access_log: Optional[bool] = None,
         unix: Optional[str] = None,
         loop: None = None,
+        reload_dir: Optional[Union[List[str], str]] = None,
     ) -> None:
         """
         Run the HTTP Server and listen until keyboard interrupt or term
@@ -868,6 +988,18 @@ class Sanic(BaseSanic):
         :type unix: str
         :return: Nothing
         """
+        if reload_dir:
+            if isinstance(reload_dir, str):
+                reload_dir = [reload_dir]
+
+            for directory in reload_dir:
+                direc = Path(directory)
+                if not direc.is_dir():
+                    logger.warning(
+                        f"Directory {directory} could not be located"
+                    )
+                self.reload_dirs.add(Path(directory))
+
         if loop is not None:
             raise TypeError(
                 "loop is not a valid argument. To use an existing loop, "
@@ -877,8 +1009,9 @@ class Sanic(BaseSanic):
             )
 
         if auto_reload or auto_reload is None and debug:
+            self.auto_reload = True
             if os.environ.get("SANIC_SERVER_RUNNING") != "true":
-                return reloader_helpers.watchdog(1.0)
+                return reloader_helpers.watchdog(1.0, self)
 
         if sock is None:
             host, port = host or "127.0.0.1", port or 8000
@@ -941,7 +1074,7 @@ class Sanic(BaseSanic):
         port: Optional[int] = None,
         *,
         debug: bool = False,
-        ssl: Union[dict, SSLContext, None] = None,
+        ssl: Union[Dict[str, str], SSLContext, None] = None,
         sock: Optional[socket] = None,
         protocol: Type[Protocol] = None,
         backlog: int = 100,
@@ -1013,11 +1146,6 @@ class Sanic(BaseSanic):
             run_async=return_asyncio_server,
         )
 
-        # Trigger before_start events
-        await self.trigger_events(
-            server_settings.get("before_start", []),
-            server_settings.get("loop"),
-        )
         main_start = server_settings.pop("main_start", None)
         main_stop = server_settings.pop("main_stop", None)
         if main_start or main_stop:
@@ -1030,17 +1158,9 @@ class Sanic(BaseSanic):
             asyncio_server_kwargs=asyncio_server_kwargs, **server_settings
         )
 
-    async def trigger_events(self, events, loop):
-        """Trigger events (functions or async)
-        :param events: one or more sync or async functions to execute
-        :param loop: event loop
-        """
-        for event in events:
-            result = event(loop)
-            if isawaitable(result):
-                await result
-
-    async def _run_request_middleware(self, request, request_name=None):
+    async def _run_request_middleware(
+        self, request, request_name=None
+    ):  # no cov
         # The if improves speed.  I don't know why
         named_middleware = self.named_request_middleware.get(
             request_name, deque()
@@ -1053,25 +1173,67 @@ class Sanic(BaseSanic):
             request.request_middleware_started = True
 
             for middleware in applicable_middleware:
+                await self.dispatch(
+                    "http.middleware.before",
+                    inline=True,
+                    context={
+                        "request": request,
+                        "response": None,
+                    },
+                    condition={"attach_to": "request"},
+                )
+
                 response = middleware(request)
                 if isawaitable(response):
                     response = await response
+
+                await self.dispatch(
+                    "http.middleware.after",
+                    inline=True,
+                    context={
+                        "request": request,
+                        "response": None,
+                    },
+                    condition={"attach_to": "request"},
+                )
+
                 if response:
                     return response
         return None
 
     async def _run_response_middleware(
         self, request, response, request_name=None
-    ):
+    ):  # no cov
         named_middleware = self.named_response_middleware.get(
             request_name, deque()
         )
         applicable_middleware = self.response_middleware + named_middleware
         if applicable_middleware:
             for middleware in applicable_middleware:
+                await self.dispatch(
+                    "http.middleware.before",
+                    inline=True,
+                    context={
+                        "request": request,
+                        "response": response,
+                    },
+                    condition={"attach_to": "response"},
+                )
+
                 _response = middleware(request, response)
                 if isawaitable(_response):
                     _response = await _response
+
+                await self.dispatch(
+                    "http.middleware.after",
+                    inline=True,
+                    context={
+                        "request": request,
+                        "response": _response if _response else response,
+                    },
+                    condition={"attach_to": "response"},
+                )
+
                 if _response:
                     response = _response
                     if isinstance(response, BaseHTTPResponse):
@@ -1097,10 +1259,6 @@ class Sanic(BaseSanic):
     ):
         """Helper function used by `run` and `create_server`."""
 
-        self.listeners["before_server_start"] = [
-            self.finalize
-        ] + self.listeners["before_server_start"]
-
         if isinstance(ssl, dict):
             # try common aliaseses
             cert = ssl.get("cert") or ssl.get("certificate")
@@ -1137,10 +1295,6 @@ class Sanic(BaseSanic):
         # Register start/stop events
 
         for event_name, settings_name, reverse in (
-            ("before_server_start", "before_start", False),
-            ("after_server_start", "after_start", False),
-            ("before_server_stop", "before_stop", True),
-            ("after_server_stop", "after_stop", True),
             ("main_process_start", "main_start", False),
             ("main_process_stop", "main_stop", True),
         ):
@@ -1177,6 +1331,11 @@ class Sanic(BaseSanic):
             else:
                 logger.info(f"Goin' Fast @ {proto}://{host}:{port}")
 
+        debug_mode = "enabled" if self.debug else "disabled"
+        reload_mode = "enabled" if auto_reload else "disabled"
+        logger.debug(f"Sanic auto-reload: {reload_mode}")
+        logger.debug(f"Sanic debug mode: {debug_mode}")
+
         return server_settings
 
     def _build_endpoint_name(self, *parts):
@@ -1184,20 +1343,44 @@ class Sanic(BaseSanic):
         return ".".join(parts)
 
     @classmethod
-    def _loop_add_task(cls, task, app, loop):
+    def _prep_task(cls, task, app, loop):
         if callable(task):
             try:
-                loop.create_task(task(app))
+                task = task(app)
             except TypeError:
-                loop.create_task(task())
-        else:
-            loop.create_task(task)
+                task = task()
+
+        return task
+
+    @classmethod
+    def _loop_add_task(cls, task, app, loop):
+        prepped = cls._prep_task(task, app, loop)
+        loop.create_task(prepped)
 
     @classmethod
     def _cancel_websocket_tasks(cls, app, loop):
         for task in app.websocket_tasks:
             task.cancel()
 
+    @staticmethod
+    async def dispatch_delayed_tasks(app, loop):
+        for name in app._delayed_tasks:
+            await app.dispatch(name, context={"app": app, "loop": loop})
+        app._delayed_tasks.clear()
+
+    @staticmethod
+    async def run_delayed_task(app, loop, task):
+        prepped = app._prep_task(task, app, loop)
+        await prepped
+
+    @staticmethod
+    async def _listener(
+        app: Sanic, loop: AbstractEventLoop, listener: ListenerType
+    ):
+        maybe_coro = listener(app, loop)
+        if maybe_coro and isawaitable(maybe_coro):
+            await maybe_coro
+
     # -------------------------------------------------------------------- #
     # ASGI
     # -------------------------------------------------------------------- #
@@ -1271,15 +1454,52 @@ class Sanic(BaseSanic):
             raise SanicException(f'Sanic app name "{name}" not found.')
 
     # -------------------------------------------------------------------- #
-    # Static methods
+    # Lifecycle
     # -------------------------------------------------------------------- #
 
-    @staticmethod
-    async def finalize(app, _):
+    def finalize(self):
         try:
-            app.router.finalize()
-            if app.signal_router.routes:
-                app.signal_router.finalize()  # noqa
+            self.router.finalize()
         except FinalizationError as e:
             if not Sanic.test_mode:
-                raise e  # noqa
+                raise e
+
+    def signalize(self):
+        try:
+            self.signal_router.finalize()
+        except FinalizationError as e:
+            if not Sanic.test_mode:
+                raise e
+
+    async def _startup(self):
+        self.signalize()
+        self.finalize()
+        ErrorHandler.finalize(self.error_handler)
+        TouchUp.run(self)
+
+    async def _server_event(
+        self,
+        concern: str,
+        action: str,
+        loop: Optional[AbstractEventLoop] = None,
+    ) -> None:
+        event = f"server.{concern}.{action}"
+        if action not in ("before", "after") or concern not in (
+            "init",
+            "shutdown",
+        ):
+            raise SanicException(f"Invalid server event: {event}")
+        logger.debug(f"Triggering server events: {event}")
+        reverse = concern == "shutdown"
+        if loop is None:
+            loop = self.loop
+        await self.dispatch(
+            event,
+            fail_not_found=False,
+            reverse=reverse,
+            inline=True,
+            context={
+                "app": self,
+                "loop": loop,
+            },
+        )

sanic/asgi.py

@@ -1,6 +1,5 @@
 import warnings
 
-from inspect import isawaitable
 from typing import Optional
 from urllib.parse import quote
 
@@ -11,21 +10,27 @@ from sanic.exceptions import ServerError
 from sanic.models.asgi import ASGIReceive, ASGIScope, ASGISend, MockTransport
 from sanic.request import Request
 from sanic.server import ConnInfo
-from sanic.websocket import WebSocketConnection
+from sanic.server.websockets.connection import WebSocketConnection
 
 
 class Lifespan:
     def __init__(self, asgi_app: "ASGIApp") -> None:
         self.asgi_app = asgi_app
 
-        if "before_server_start" in self.asgi_app.sanic_app.listeners:
+        if (
+            "server.init.before"
+            in self.asgi_app.sanic_app.signal_router.name_index
+        ):
             warnings.warn(
                 'You have set a listener for "before_server_start" '
                 "in ASGI mode. "
                 "It will be executed as early as possible, but not before "
                 "the ASGI server is started."
             )
-        if "after_server_stop" in self.asgi_app.sanic_app.listeners:
+        if (
+            "server.shutdown.after"
+            in self.asgi_app.sanic_app.signal_router.name_index
+        ):
             warnings.warn(
                 'You have set a listener for "after_server_stop" '
                 "in ASGI mode. "
@@ -42,19 +47,9 @@ class Lifespan:
         in sequence since the ASGI lifespan protocol only supports a single
         startup event.
         """
-        self.asgi_app.sanic_app.router.finalize()
-        if self.asgi_app.sanic_app.signal_router.routes:
-            self.asgi_app.sanic_app.signal_router.finalize()
-        listeners = self.asgi_app.sanic_app.listeners.get(
-            "before_server_start", []
-        ) + self.asgi_app.sanic_app.listeners.get("after_server_start", [])
-
-        for handler in listeners:
-            response = handler(
-                self.asgi_app.sanic_app, self.asgi_app.sanic_app.loop
-            )
-            if response and isawaitable(response):
-                await response
+        await self.asgi_app.sanic_app._startup()
+        await self.asgi_app.sanic_app._server_event("init", "before")
+        await self.asgi_app.sanic_app._server_event("init", "after")
 
     async def shutdown(self) -> None:
         """
@@ -65,16 +60,8 @@ class Lifespan:
         in sequence since the ASGI lifespan protocol only supports a single
         shutdown event.
         """
-        listeners = self.asgi_app.sanic_app.listeners.get(
-            "before_server_stop", []
-        ) + self.asgi_app.sanic_app.listeners.get("after_server_stop", [])
-
-        for handler in listeners:
-            response = handler(
-                self.asgi_app.sanic_app, self.asgi_app.sanic_app.loop
-            )
-            if response and isawaitable(response):
-                await response
+        await self.asgi_app.sanic_app._server_event("shutdown", "before")
+        await self.asgi_app.sanic_app._server_event("shutdown", "after")
 
     async def __call__(
         self, scope: ASGIScope, receive: ASGIReceive, send: ASGISend
@@ -140,7 +127,6 @@ class ASGIApp:
                 instance.ws = instance.transport.create_websocket_connection(
                     send, receive
                 )
-                await instance.ws.accept()
             else:
                 raise ServerError("Received unknown ASGI scope")
 
@@ -164,10 +150,12 @@ class ASGIApp:
         Read and stream the body in chunks from an incoming ASGI message.
         """
         message = await self.transport.receive()
+        body = message.get("body", b"")
         if not message.get("more_body", False):
             self.request_body = False
-            return None
-        return message.get("body", b"")
+            if not body:
+                return None
+        return body
 
     async def __aiter__(self):
         while self.request_body:
@@ -206,4 +194,7 @@ class ASGIApp:
         """
         Handle the incoming request.
         """
-        await self.sanic_app.handle_request(self.request)
+        try:
+            await self.sanic_app.handle_request(self.request)
+        except Exception as e:
+            await self.sanic_app.handle_exception(self.request, e)

sanic/base.py

@@ -1,6 +1,9 @@
+import re
+
 from typing import Any, Tuple
 from warnings import warn
 
+from sanic.exceptions import SanicException
 from sanic.mixins.exceptions import ExceptionMixin
 from sanic.mixins.listeners import ListenerMixin
 from sanic.mixins.middleware import MiddlewareMixin
@@ -8,6 +11,9 @@ from sanic.mixins.routes import RouteMixin
 from sanic.mixins.signals import SignalMixin
 
 
+VALID_NAME = re.compile(r"^[a-zA-Z][a-zA-Z0-9_\-]*$")
+
+
 class BaseSanic(
     RouteMixin,
     MiddlewareMixin,
@@ -17,7 +23,25 @@ class BaseSanic(
 ):
     __fake_slots__: Tuple[str, ...]
 
-    def __init__(self, *args, **kwargs) -> None:
+    def __init__(self, name: str = None, *args, **kwargs) -> None:
+        class_name = self.__class__.__name__
+
+        if name is None:
+            raise SanicException(
+                f"{class_name} instance cannot be unnamed. "
+                "Please use Sanic(name='your_application_name') instead.",
+            )
+
+        if not VALID_NAME.match(name):
+            warn(
+                f"{class_name} instance named '{name}' uses a format that is"
+                f"deprecated. Starting in version 21.12, {class_name} objects "
+                "must be named only using alphanumeric characters, _, or -.",
+                DeprecationWarning,
+            )
+
+        self.name = name
+
         for base in BaseSanic.__bases__:
             base.__init__(self, *args, **kwargs)  # type: ignore
 
@@ -34,8 +58,9 @@ class BaseSanic(
         if name not in self.__fake_slots__:
             warn(
                 f"Setting variables on {self.__class__.__name__} instances is "
-                "deprecated and will be removed in version 21.9. You should "
+                "deprecated and will be removed in version 21.12. You should "
                 f"change your {self.__class__.__name__} instance to use "
-                f"instance.ctx.{name} instead."
+                f"instance.ctx.{name} instead.",
+                DeprecationWarning,
             )
         super().__setattr__(name, value)

sanic/blueprint_group.py

@@ -1,7 +1,12 @@
-from collections.abc import MutableSequence
-from typing import List, Optional, Union
+from __future__ import annotations
 
-import sanic
+from collections.abc import MutableSequence
+from functools import partial
+from typing import TYPE_CHECKING, List, Optional, Union
+
+
+if TYPE_CHECKING:
+    from sanic.blueprints import Blueprint
 
 
 class BlueprintGroup(MutableSequence):
@@ -54,9 +59,21 @@ class BlueprintGroup(MutableSequence):
         app.blueprint(bpg)
     """
 
-    __slots__ = ("_blueprints", "_url_prefix", "_version", "_strict_slashes")
+    __slots__ = (
+        "_blueprints",
+        "_url_prefix",
+        "_version",
+        "_strict_slashes",
+        "_version_prefix",
+    )
 
-    def __init__(self, url_prefix=None, version=None, strict_slashes=None):
+    def __init__(
+        self,
+        url_prefix: Optional[str] = None,
+        version: Optional[Union[int, str, float]] = None,
+        strict_slashes: Optional[bool] = None,
+        version_prefix: str = "/v",
+    ):
         """
         Create a new Blueprint Group
 
@@ -65,13 +82,14 @@ class BlueprintGroup(MutableSequence):
             inherited by each of the Blueprint
         :param strict_slashes: URL Strict slash behavior indicator
         """
-        self._blueprints = []
+        self._blueprints: List[Blueprint] = []
         self._url_prefix = url_prefix
         self._version = version
+        self._version_prefix = version_prefix
         self._strict_slashes = strict_slashes
 
     @property
-    def url_prefix(self) -> str:
+    def url_prefix(self) -> Optional[Union[int, str, float]]:
         """
         Retrieve the URL prefix being used for the Current Blueprint Group
 
@@ -80,7 +98,7 @@ class BlueprintGroup(MutableSequence):
         return self._url_prefix
 
     @property
-    def blueprints(self) -> List["sanic.Blueprint"]:
+    def blueprints(self) -> List[Blueprint]:
         """
         Retrieve a list of all the available blueprints under this group.
 
@@ -107,6 +125,15 @@ class BlueprintGroup(MutableSequence):
         """
         return self._strict_slashes
 
+    @property
+    def version_prefix(self) -> str:
+        """
+        Version prefix; defaults to ``/v``
+
+        :return: str
+        """
+        return self._version_prefix
+
     def __iter__(self):
         """
         Tun the class Blueprint Group into an Iterable item
@@ -161,34 +188,37 @@ class BlueprintGroup(MutableSequence):
         """
         return len(self._blueprints)
 
-    def _sanitize_blueprint(self, bp: "sanic.Blueprint") -> "sanic.Blueprint":
-        """
-        Sanitize the Blueprint Entity to override the Version and strict slash
-        behaviors as required.
-
-        :param bp: Sanic Blueprint entity Object
-        :return: Modified Blueprint
-        """
-        if self._url_prefix:
-            merged_prefix = "/".join(
-                u.strip("/") for u in [self._url_prefix, bp.url_prefix or ""]
-            ).rstrip("/")
-            bp.url_prefix = f"/{merged_prefix}"
-        for _attr in ["version", "strict_slashes"]:
-            if getattr(bp, _attr) is None:
-                setattr(bp, _attr, getattr(self, _attr))
-        return bp
-
-    def append(self, value: "sanic.Blueprint") -> None:
+    def append(self, value: Blueprint) -> None:
         """
         The Abstract class `MutableSequence` leverages this append method to
         perform the `BlueprintGroup.append` operation.
         :param value: New `Blueprint` object.
         :return: None
         """
-        self._blueprints.append(self._sanitize_blueprint(bp=value))
+        self._blueprints.append(value)
 
-    def insert(self, index: int, item: "sanic.Blueprint") -> None:
+    def exception(self, *exceptions, **kwargs):
+        """
+        A decorator that can be used to implement a global exception handler
+        for all the Blueprints that belong to this Blueprint Group.
+
+        In case of nested Blueprint Groups, the same handler is applied
+        across each of the Blueprints recursively.
+
+        :param args: List of Python exceptions to be caught by the handler
+        :param kwargs: Additional optional arguments to be passed to the
+            exception handler
+        :return a decorated method to handle global exceptions for any
+            blueprint registered under this group.
+        """
+
+        def register_exception_handler_for_blueprints(fn):
+            for blueprint in self.blueprints:
+                blueprint.exception(*exceptions, **kwargs)(fn)
+
+        return register_exception_handler_for_blueprints
+
+    def insert(self, index: int, item: Blueprint) -> None:
         """
         The Abstract class `MutableSequence` leverages this insert method to
         perform the `BlueprintGroup.append` operation.
@@ -197,7 +227,7 @@ class BlueprintGroup(MutableSequence):
         :param item: New `Blueprint` object.
         :return: None
         """
-        self._blueprints.insert(index, self._sanitize_blueprint(item))
+        self._blueprints.insert(index, item)
 
     def middleware(self, *args, **kwargs):
         """
@@ -221,3 +251,15 @@ class BlueprintGroup(MutableSequence):
             args = list(args)[1:]
             return register_middleware_for_blueprints(fn)
         return register_middleware_for_blueprints
+
+    def on_request(self, middleware=None):
+        if callable(middleware):
+            return self.middleware(middleware, "request")
+        else:
+            return partial(self.middleware, attach_to="request")
+
+    def on_response(self, middleware=None):
+        if callable(middleware):
+            return self.middleware(middleware, "response")
+        else:
+            return partial(self.middleware, attach_to="response")

sanic/blueprints.py

@@ -3,6 +3,7 @@ from __future__ import annotations
 import asyncio
 
 from collections import defaultdict
+from copy import deepcopy
 from types import SimpleNamespace
 from typing import TYPE_CHECKING, Dict, Iterable, List, Optional, Set, Union
 
@@ -12,6 +13,7 @@ from sanic_routing.route import Route  # type: ignore
 from sanic.base import BaseSanic
 from sanic.blueprint_group import BlueprintGroup
 from sanic.exceptions import SanicException
+from sanic.helpers import Default, _default
 from sanic.models.futures import FutureRoute, FutureStatic
 from sanic.models.handler_types import (
     ListenerType,
@@ -40,7 +42,7 @@ class Blueprint(BaseSanic):
     :param host: IP Address of FQDN for the sanic server to use.
     :param version: Blueprint Version
     :param strict_slashes: Enforce the API urls are requested with a
-        training */*
+        trailing */*
     """
 
     __fake_slots__ = (
@@ -62,28 +64,23 @@ class Blueprint(BaseSanic):
         "strict_slashes",
         "url_prefix",
         "version",
+        "version_prefix",
         "websocket_routes",
     )
 
     def __init__(
         self,
-        name: str,
+        name: str = None,
         url_prefix: Optional[str] = None,
         host: Optional[str] = None,
-        version: Optional[int] = None,
+        version: Optional[Union[int, str, float]] = None,
         strict_slashes: Optional[bool] = None,
+        version_prefix: str = "/v",
     ):
-        super().__init__()
-
-        self._apps: Set[Sanic] = set()
+        super().__init__(name=name)
+        self.reset()
         self.ctx = SimpleNamespace()
-        self.exceptions: List[RouteHandler] = []
         self.host = host
-        self.listeners: Dict[str, List[ListenerType]] = {}
-        self.middlewares: List[MiddlewareType] = []
-        self.name = name
-        self.routes: List[Route] = []
-        self.statics: List[RouteHandler] = []
         self.strict_slashes = strict_slashes
         self.url_prefix = (
             url_prefix[:-1]
@@ -91,7 +88,7 @@ class Blueprint(BaseSanic):
             else url_prefix
         )
         self.version = version
-        self.websocket_routes: List[Route] = []
+        self.version_prefix = version_prefix
 
     def __repr__(self) -> str:
         args = ", ".join(
@@ -142,8 +139,89 @@ class Blueprint(BaseSanic):
         kwargs["apply"] = False
         return super().signal(event, *args, **kwargs)
 
+    def reset(self):
+        self._apps: Set[Sanic] = set()
+        self.exceptions: List[RouteHandler] = []
+        self.listeners: Dict[str, List[ListenerType]] = {}
+        self.middlewares: List[MiddlewareType] = []
+        self.routes: List[Route] = []
+        self.statics: List[RouteHandler] = []
+        self.websocket_routes: List[Route] = []
+
+    def copy(
+        self,
+        name: str,
+        url_prefix: Optional[Union[str, Default]] = _default,
+        version: Optional[Union[int, str, float, Default]] = _default,
+        version_prefix: Union[str, Default] = _default,
+        strict_slashes: Optional[Union[bool, Default]] = _default,
+        with_registration: bool = True,
+        with_ctx: bool = False,
+    ):
+        """
+        Copy a blueprint instance with some optional parameters to
+        override the values of attributes in the old instance.
+
+        :param name: unique name of the blueprint
+        :param url_prefix: URL to be prefixed before all route URLs
+        :param version: Blueprint Version
+        :param version_prefix: the prefix of the version number shown in the
+            URL.
+        :param strict_slashes: Enforce the API urls are requested with a
+            trailing */*
+        :param with_registration: whether register new blueprint instance with
+            sanic apps that were registered with the old instance or not.
+        :param with_ctx: whether ``ctx`` will be copied or not.
+        """
+
+        attrs_backup = {
+            "_apps": self._apps,
+            "routes": self.routes,
+            "websocket_routes": self.websocket_routes,
+            "middlewares": self.middlewares,
+            "exceptions": self.exceptions,
+            "listeners": self.listeners,
+            "statics": self.statics,
+        }
+
+        self.reset()
+        new_bp = deepcopy(self)
+        new_bp.name = name
+
+        if not isinstance(url_prefix, Default):
+            new_bp.url_prefix = url_prefix
+        if not isinstance(version, Default):
+            new_bp.version = version
+        if not isinstance(strict_slashes, Default):
+            new_bp.strict_slashes = strict_slashes
+        if not isinstance(version_prefix, Default):
+            new_bp.version_prefix = version_prefix
+
+        for key, value in attrs_backup.items():
+            setattr(self, key, value)
+
+        if with_registration and self._apps:
+            if new_bp._future_statics:
+                raise SanicException(
+                    "Static routes registered with the old blueprint instance,"
+                    " cannot be registered again."
+                )
+            for app in self._apps:
+                app.blueprint(new_bp)
+
+        if not with_ctx:
+            new_bp.ctx = SimpleNamespace()
+
+        return new_bp
+
     @staticmethod
-    def group(*blueprints, url_prefix="", version=None, strict_slashes=None):
+    def group(
+        *blueprints: Union[Blueprint, BlueprintGroup],
+        url_prefix: Optional[str] = None,
+        version: Optional[Union[int, str, float]] = None,
+        strict_slashes: Optional[bool] = None,
+        version_prefix: str = "/v",
+    ):
         """
         Create a list of blueprints, optionally grouping them under a
         general URL prefix.
@@ -160,8 +238,6 @@ class Blueprint(BaseSanic):
             for i in nested:
                 if isinstance(i, (list, tuple)):
                     yield from chain(i)
-                elif isinstance(i, BlueprintGroup):
-                    yield from i.blueprints
                 else:
                     yield i
 
@@ -169,6 +245,7 @@ class Blueprint(BaseSanic):
             url_prefix=url_prefix,
             version=version,
             strict_slashes=strict_slashes,
+            version_prefix=version_prefix,
         )
         for bp in chain(blueprints):
             bps.append(bp)
@@ -186,6 +263,12 @@ class Blueprint(BaseSanic):
 
         self._apps.add(app)
         url_prefix = options.get("url_prefix", self.url_prefix)
+        opt_version = options.get("version", None)
+        opt_strict_slashes = options.get("strict_slashes", None)
+        opt_version_prefix = options.get("version_prefix", self.version_prefix)
+        error_format = options.get(
+            "error_format", app.config.FALLBACK_ERROR_FORMAT
+        )
 
         routes = []
         middleware = []
@@ -200,12 +283,22 @@ class Blueprint(BaseSanic):
             # Prepend the blueprint URI prefix if available
             uri = url_prefix + future.uri if url_prefix else future.uri
 
-            strict_slashes = (
-                self.strict_slashes
-                if future.strict_slashes is None
-                and self.strict_slashes is not None
-                else future.strict_slashes
+            version_prefix = self.version_prefix
+            for prefix in (
+                future.version_prefix,
+                opt_version_prefix,
+            ):
+                if prefix and prefix != "/v":
+                    version_prefix = prefix
+                    break
+
+            version = self._extract_value(
+                future.version, opt_version, self.version
             )
+            strict_slashes = self._extract_value(
+                future.strict_slashes, opt_strict_slashes, self.strict_slashes
+            )
+
             name = app._generate_name(future.name)
 
             apply_route = FutureRoute(
@@ -215,13 +308,15 @@ class Blueprint(BaseSanic):
                 future.host or self.host,
                 strict_slashes,
                 future.stream,
-                future.version or self.version,
+                version,
                 name,
                 future.ignore_body,
                 future.websocket,
                 future.subprotocols,
                 future.unquote,
                 future.static,
+                version_prefix,
+                error_format,
             )
 
             route = app._apply_route(apply_route)
@@ -240,26 +335,27 @@ class Blueprint(BaseSanic):
 
         route_names = [route.name for route in routes if route]
 
-        # Middleware
         if route_names:
+            # Middleware
             for future in self._future_middleware:
                 middleware.append(app._apply_middleware(future, route_names))
 
-        # Exceptions
-        for future in self._future_exceptions:
-            exception_handlers.append(app._apply_exception_handler(future))
+            # Exceptions
+            for future in self._future_exceptions:
+                exception_handlers.append(
+                    app._apply_exception_handler(future, route_names)
+                )
 
         # Event listeners
         for listener in self._future_listeners:
             listeners[listener.event].append(app._apply_listener(listener))
 
+        # Signals
         for signal in self._future_signals:
             signal.condition.update({"blueprint": self.name})
             app._apply_signal(signal)
 
         self.routes = [route for route in routes if isinstance(route, Route)]
-
-        # Deprecate these in 21.6
         self.websocket_routes = [
             route for route in self.routes if route.ctx.websocket
         ]
@@ -288,3 +384,12 @@ class Blueprint(BaseSanic):
             return_when=asyncio.FIRST_COMPLETED,
             timeout=timeout,
         )
+
+    @staticmethod
+    def _extract_value(*values):
+        value = values[-1]
+        for v in values:
+            if v is not None:
+                value = v
+                break
+        return value

sanic/config.py

@@ -1,7 +1,11 @@
 from inspect import isclass
 from os import environ
 from pathlib import Path
-from typing import Any, Union
+from typing import Any, Dict, Optional, Union
+from warnings import warn
+
+from sanic.errorpages import check_error_format
+from sanic.http import Http
 
 from .utils import load_module_from_file_location, str_to_bool
 
@@ -15,33 +19,59 @@ BASE_LOGO = """
 """
 
 DEFAULT_CONFIG = {
-    "REQUEST_MAX_SIZE": 100000000,  # 100 megabytes
-    "REQUEST_BUFFER_QUEUE_SIZE": 100,
+    "ACCESS_LOG": True,
+    "EVENT_AUTOREGISTER": False,
+    "FALLBACK_ERROR_FORMAT": "auto",
+    "FORWARDED_FOR_HEADER": "X-Forwarded-For",
+    "FORWARDED_SECRET": None,
+    "GRACEFUL_SHUTDOWN_TIMEOUT": 15.0,  # 15 sec
+    "KEEP_ALIVE_TIMEOUT": 5,  # 5 seconds
+    "KEEP_ALIVE": True,
+    "PROXIES_COUNT": None,
+    "REAL_IP_HEADER": None,
+    "REGISTER": True,
     "REQUEST_BUFFER_SIZE": 65536,  # 64 KiB
+    "REQUEST_MAX_HEADER_SIZE": 8192,  # 8 KiB, but cannot exceed 16384
+    "REQUEST_ID_HEADER": "X-Request-ID",
+    "REQUEST_MAX_SIZE": 100000000,  # 100 megabytes
     "REQUEST_TIMEOUT": 60,  # 60 seconds
     "RESPONSE_TIMEOUT": 60,  # 60 seconds
-    "KEEP_ALIVE": True,
-    "KEEP_ALIVE_TIMEOUT": 5,  # 5 seconds
     "WEBSOCKET_MAX_SIZE": 2 ** 20,  # 1 megabyte
-    "WEBSOCKET_MAX_QUEUE": 32,
-    "WEBSOCKET_READ_LIMIT": 2 ** 16,
-    "WEBSOCKET_WRITE_LIMIT": 2 ** 16,
-    "WEBSOCKET_PING_TIMEOUT": 20,
     "WEBSOCKET_PING_INTERVAL": 20,
-    "GRACEFUL_SHUTDOWN_TIMEOUT": 15.0,  # 15 sec
-    "ACCESS_LOG": True,
-    "FORWARDED_SECRET": None,
-    "REAL_IP_HEADER": None,
-    "PROXIES_COUNT": None,
-    "FORWARDED_FOR_HEADER": "X-Forwarded-For",
-    "REQUEST_ID_HEADER": "X-Request-ID",
-    "FALLBACK_ERROR_FORMAT": "html",
-    "REGISTER": True,
+    "WEBSOCKET_PING_TIMEOUT": 20,
 }
 
 
 class Config(dict):
-    def __init__(self, defaults=None, load_env=True, keep_alive=None):
+    ACCESS_LOG: bool
+    EVENT_AUTOREGISTER: bool
+    FALLBACK_ERROR_FORMAT: str
+    FORWARDED_FOR_HEADER: str
+    FORWARDED_SECRET: Optional[str]
+    GRACEFUL_SHUTDOWN_TIMEOUT: float
+    KEEP_ALIVE_TIMEOUT: int
+    KEEP_ALIVE: bool
+    PROXIES_COUNT: Optional[int]
+    REAL_IP_HEADER: Optional[str]
+    REGISTER: bool
+    REQUEST_BUFFER_SIZE: int
+    REQUEST_MAX_HEADER_SIZE: int
+    REQUEST_ID_HEADER: str
+    REQUEST_MAX_SIZE: int
+    REQUEST_TIMEOUT: int
+    RESPONSE_TIMEOUT: int
+    SERVER_NAME: str
+    WEBSOCKET_MAX_SIZE: int
+    WEBSOCKET_PING_INTERVAL: int
+    WEBSOCKET_PING_TIMEOUT: int
+
+    def __init__(
+        self,
+        defaults: Dict[str, Union[str, bool, int, float, None]] = None,
+        load_env: Optional[Union[bool, str]] = True,
+        env_prefix: Optional[str] = SANIC_PREFIX,
+        keep_alive: Optional[bool] = None,
+    ):
         defaults = defaults or {}
         super().__init__({**DEFAULT_CONFIG, **defaults})
 
@@ -50,9 +80,23 @@ class Config(dict):
         if keep_alive is not None:
             self.KEEP_ALIVE = keep_alive
 
-        if load_env:
-            prefix = SANIC_PREFIX if load_env is True else load_env
-            self.load_environment_vars(prefix=prefix)
+        if env_prefix != SANIC_PREFIX:
+            if env_prefix:
+                self.load_environment_vars(env_prefix)
+        elif load_env is not True:
+            if load_env:
+                self.load_environment_vars(prefix=load_env)
+            warn(
+                "Use of load_env is deprecated and will be removed in "
+                "21.12. Modify the configuration prefix by passing "
+                "env_prefix instead.",
+                DeprecationWarning,
+            )
+        else:
+            self.load_environment_vars(SANIC_PREFIX)
+
+        self._configure_header_size()
+        self._check_error_format()
 
     def __getattr__(self, attr):
         try:
@@ -62,6 +106,24 @@ class Config(dict):
 
     def __setattr__(self, attr, value):
         self[attr] = value
+        if attr in (
+            "REQUEST_MAX_HEADER_SIZE",
+            "REQUEST_BUFFER_SIZE",
+            "REQUEST_MAX_SIZE",
+        ):
+            self._configure_header_size()
+        elif attr == "FALLBACK_ERROR_FORMAT":
+            self._check_error_format()
+
+    def _configure_header_size(self):
+        Http.set_header_max_size(
+            self.REQUEST_MAX_HEADER_SIZE,
+            self.REQUEST_BUFFER_SIZE - 4096,
+            self.REQUEST_MAX_SIZE,
+        )
+
+    def _check_error_format(self):
+        check_error_format(self.FALLBACK_ERROR_FORMAT)
 
     def load_environment_vars(self, prefix=SANIC_PREFIX):
         """

sanic/constants.py

@@ -1,2 +1,28 @@
-HTTP_METHODS = ("GET", "POST", "PUT", "HEAD", "OPTIONS", "PATCH", "DELETE")
+from enum import Enum, auto
+
+
+class HTTPMethod(str, Enum):
+    def _generate_next_value_(name, start, count, last_values):
+        return name.upper()
+
+    def __eq__(self, value: object) -> bool:
+        value = str(value).upper()
+        return super().__eq__(value)
+
+    def __hash__(self) -> int:
+        return hash(self.value)
+
+    def __str__(self) -> str:
+        return self.value
+
+    GET = auto()
+    POST = auto()
+    PUT = auto()
+    HEAD = auto()
+    OPTIONS = auto()
+    PATCH = auto()
+    DELETE = auto()
+
+
+HTTP_METHODS = tuple(HTTPMethod.__members__.values())
 DEFAULT_HTTP_CONTENT_TYPE = "application/octet-stream"

sanic/errorpages.py

@@ -340,41 +340,138 @@ RENDERERS_BY_CONFIG = {
 }
 
 RENDERERS_BY_CONTENT_TYPE = {
-    "multipart/form-data": HTMLRenderer,
-    "application/json": JSONRenderer,
     "text/plain": TextRenderer,
+    "application/json": JSONRenderer,
+    "multipart/form-data": HTMLRenderer,
+    "text/html": HTMLRenderer,
 }
+CONTENT_TYPE_BY_RENDERERS = {
+    v: k for k, v in RENDERERS_BY_CONTENT_TYPE.items()
+}
+
+RESPONSE_MAPPING = {
+    "empty": "html",
+    "json": "json",
+    "text": "text",
+    "raw": "text",
+    "html": "html",
+    "file": "html",
+    "file_stream": "text",
+    "stream": "text",
+    "redirect": "html",
+    "text/plain": "text",
+    "text/html": "html",
+    "application/json": "json",
+}
+
+
+def check_error_format(format):
+    if format not in RENDERERS_BY_CONFIG and format != "auto":
+        raise SanicException(f"Unknown format: {format}")
 
 
 def exception_response(
     request: Request,
     exception: Exception,
     debug: bool,
+    fallback: str,
+    base: t.Type[BaseRenderer],
     renderer: t.Type[t.Optional[BaseRenderer]] = None,
 ) -> HTTPResponse:
     """
     Render a response for the default FALLBACK exception handler.
     """
+    content_type = None
 
     if not renderer:
-        renderer = HTMLRenderer
+        # Make sure we have something set
+        renderer = base
+        render_format = fallback
 
         if request:
-            if request.app.config.FALLBACK_ERROR_FORMAT == "auto":
+            # If there is a request, try and get the format
+            # from the route
+            if request.route:
                 try:
-                    renderer = JSONRenderer if request.json else HTMLRenderer
-                except InvalidUsage:
+                    render_format = request.route.ctx.error_format
+                except AttributeError:
+                    ...
+
+            content_type = request.headers.getone("content-type", "").split(
+                ";"
+            )[0]
+
+            acceptable = request.accept
+
+            # If the format is auto still, make a guess
+            if render_format == "auto":
+                # First, if there is an Accept header, check if text/html
+                # is the first option
+                # According to MDN Web Docs, all major browsers use text/html
+                # as the primary value in Accept (with the exception of IE 8,
+                # and, well, if you are supporting IE 8, then you have bigger
+                # problems to concern yourself with than what default exception
+                # renderer is used)
+                # Source:
+                # https://developer.mozilla.org/en-US/docs/Web/HTTP/Content_negotiation/List_of_default_Accept_values
+
+                if acceptable and acceptable[0].match(
+                    "text/html",
+                    allow_type_wildcard=False,
+                    allow_subtype_wildcard=False,
+                ):
                     renderer = HTMLRenderer
 
-                content_type, *_ = request.headers.get(
-                    "content-type", ""
-                ).split(";")
-                renderer = RENDERERS_BY_CONTENT_TYPE.get(
-                    content_type, renderer
-                )
+                # Second, if there is an Accept header, check if
+                # application/json is an option, or if the content-type
+                # is application/json
+                elif (
+                    acceptable
+                    and acceptable.match(
+                        "application/json",
+                        allow_type_wildcard=False,
+                        allow_subtype_wildcard=False,
+                    )
+                    or content_type == "application/json"
+                ):
+                    renderer = JSONRenderer
+
+                # Third, if there is no Accept header, assume we want text.
+                # The likely use case here is a raw socket.
+                elif not acceptable:
+                    renderer = TextRenderer
+                else:
+                    # Fourth, look to see if there was a JSON body
+                    # When in this situation, the request is probably coming
+                    # from curl, an API client like Postman or Insomnia, or a
+                    # package like requests or httpx
+                    try:
+                        # Give them the benefit of the doubt if they did:
+                        # $ curl localhost:8000 -d '{"foo": "bar"}'
+                        # And provide them with JSONRenderer
+                        renderer = JSONRenderer if request.json else base
+                    except InvalidUsage:
+                        renderer = base
             else:
-                render_format = request.app.config.FALLBACK_ERROR_FORMAT
                 renderer = RENDERERS_BY_CONFIG.get(render_format, renderer)
 
+            # Lastly, if there is an Accept header, make sure
+            # our choice is okay
+            if acceptable:
+                type_ = CONTENT_TYPE_BY_RENDERERS.get(renderer)  # type: ignore
+                if type_ and type_ not in acceptable:
+                    # If the renderer selected is not in the Accept header
+                    # look through what is in the Accept header, and select
+                    # the first option that matches. Otherwise, just drop back
+                    # to the original default
+                    for accept in acceptable:
+                        mtype = f"{accept.type_}/{accept.subtype}"
+                        maybe = RENDERERS_BY_CONTENT_TYPE.get(mtype)
+                        if maybe:
+                            renderer = maybe
+                            break
+                    else:
+                        renderer = base
+
     renderer = t.cast(t.Type[BaseRenderer], renderer)
     return renderer(request, exception, debug).render()

sanic/exceptions.py

@@ -3,26 +3,22 @@ from typing import Optional, Union
 from sanic.helpers import STATUS_CODES
 
 
-_sanic_exceptions = {}
-
-
-def add_status_code(code, quiet=None):
-    """
-    Decorator used for adding exceptions to :class:`SanicException`.
-    """
-
-    def class_decorator(cls):
-        cls.status_code = code
-        if quiet or quiet is None and code != 500:
-            cls.quiet = True
-        _sanic_exceptions[code] = cls
-        return cls
-
-    return class_decorator
-
-
 class SanicException(Exception):
-    def __init__(self, message, status_code=None, quiet=None):
+    message: str = ""
+
+    def __init__(
+        self,
+        message: Optional[Union[str, bytes]] = None,
+        status_code: Optional[int] = None,
+        quiet: Optional[bool] = None,
+    ) -> None:
+        if message is None:
+            if self.message:
+                message = self.message
+            elif status_code is not None:
+                msg: bytes = STATUS_CODES.get(status_code, b"")
+                message = msg.decode("utf8")
+
         super().__init__(message)
 
         if status_code is not None:
@@ -33,45 +29,45 @@ class SanicException(Exception):
             self.quiet = True
 
 
-@add_status_code(404)
 class NotFound(SanicException):
     """
     **Status**: 404 Not Found
     """
 
-    pass
+    status_code = 404
+    quiet = True
 
 
-@add_status_code(400)
 class InvalidUsage(SanicException):
     """
     **Status**: 400 Bad Request
     """
 
-    pass
+    status_code = 400
+    quiet = True
 
 
-@add_status_code(405)
 class MethodNotSupported(SanicException):
     """
     **Status**: 405 Method Not Allowed
     """
 
+    status_code = 405
+    quiet = True
+
     def __init__(self, message, method, allowed_methods):
         super().__init__(message)
         self.headers = {"Allow": ", ".join(allowed_methods)}
 
 
-@add_status_code(500)
 class ServerError(SanicException):
     """
     **Status**: 500 Internal Server Error
     """
 
-    pass
+    status_code = 500
 
 
-@add_status_code(503)
 class ServiceUnavailable(SanicException):
     """
     **Status**: 503 Service Unavailable
@@ -80,7 +76,8 @@ class ServiceUnavailable(SanicException):
     down for maintenance). Generally, this is a temporary state.
     """
 
-    pass
+    status_code = 503
+    quiet = True
 
 
 class URLBuildError(ServerError):
@@ -88,7 +85,7 @@ class URLBuildError(ServerError):
     **Status**: 500 Internal Server Error
     """
 
-    pass
+    status_code = 500
 
 
 class FileNotFound(NotFound):
@@ -102,7 +99,6 @@ class FileNotFound(NotFound):
         self.relative_url = relative_url
 
 
-@add_status_code(408)
 class RequestTimeout(SanicException):
     """The Web server (running the Web site) thinks that there has been too
     long an interval of time between 1) the establishment of an IP
@@ -112,16 +108,17 @@ class RequestTimeout(SanicException):
     server has 'timed out' on that particular socket connection.
     """
 
-    pass
+    status_code = 408
+    quiet = True
 
 
-@add_status_code(413)
 class PayloadTooLarge(SanicException):
     """
     **Status**: 413 Payload Too Large
     """
 
-    pass
+    status_code = 413
+    quiet = True
 
 
 class HeaderNotFound(InvalidUsage):
@@ -129,36 +126,42 @@ class HeaderNotFound(InvalidUsage):
     **Status**: 400 Bad Request
     """
 
-    pass
+
+class InvalidHeader(InvalidUsage):
+    """
+    **Status**: 400 Bad Request
+    """
 
 
-@add_status_code(416)
 class ContentRangeError(SanicException):
     """
     **Status**: 416 Range Not Satisfiable
     """
 
+    status_code = 416
+    quiet = True
+
     def __init__(self, message, content_range):
         super().__init__(message)
         self.headers = {"Content-Range": f"bytes */{content_range.total}"}
 
 
-@add_status_code(417)
 class HeaderExpectationFailed(SanicException):
     """
     **Status**: 417 Expectation Failed
     """
 
-    pass
+    status_code = 417
+    quiet = True
 
 
-@add_status_code(403)
 class Forbidden(SanicException):
     """
     **Status**: 403 Forbidden
     """
 
-    pass
+    status_code = 403
+    quiet = True
 
 
 class InvalidRangeType(ContentRangeError):
@@ -166,7 +169,8 @@ class InvalidRangeType(ContentRangeError):
     **Status**: 416 Range Not Satisfiable
     """
 
-    pass
+    status_code = 416
+    quiet = True
 
 
 class PyFileError(Exception):
@@ -174,7 +178,6 @@ class PyFileError(Exception):
         super().__init__("could not execute config file %s", file)
 
 
-@add_status_code(401)
 class Unauthorized(SanicException):
     """
     **Status**: 401 Unauthorized
@@ -210,6 +213,9 @@ class Unauthorized(SanicException):
                            realm="Restricted Area")
     """
 
+    status_code = 401
+    quiet = True
+
     def __init__(self, message, status_code=None, scheme=None, **kwargs):
         super().__init__(message, status_code)
 
@@ -231,6 +237,11 @@ class InvalidSignal(SanicException):
     pass
 
 
+class WebsocketClosed(SanicException):
+    quiet = True
+    message = "Client has closed the websocket connection"
+
+
 def abort(status_code: int, message: Optional[Union[str, bytes]] = None):
     """
     Raise an exception based on SanicException. Returns the HTTP response
@@ -241,9 +252,13 @@ def abort(status_code: int, message: Optional[Union[str, bytes]] = None):
     :param status_code: The HTTP status code to return.
     :param message: The HTTP response body. Defaults to the messages in
     """
-    if message is None:
-        msg: bytes = STATUS_CODES[status_code]
-        # These are stored as bytes in the STATUS_CODES dict
-        message = msg.decode("utf8")
-    sanic_exception = _sanic_exceptions.get(status_code, SanicException)
-    raise sanic_exception(message=message, status_code=status_code)
+    import warnings
+
+    warnings.warn(
+        "sanic.exceptions.abort has been marked as deprecated, and will be "
+        "removed in release 21.12.\n To migrate your code, simply replace "
+        "abort(status_code, msg) with raise SanicException(msg, status_code), "
+        "or even better, raise an appropriate SanicException subclass."
+    )
+
+    raise SanicException(message=message, status_code=status_code)

sanic/handlers.py

@@ -1,12 +1,14 @@
-from traceback import format_exc
+from inspect import signature
+from typing import Dict, List, Optional, Tuple, Type
 
-from sanic.errorpages import exception_response
+from sanic.errorpages import BaseRenderer, HTMLRenderer, exception_response
 from sanic.exceptions import (
     ContentRangeError,
     HeaderNotFound,
     InvalidRangeType,
 )
-from sanic.log import logger
+from sanic.log import error_logger
+from sanic.models.handler_types import RouteHandler
 from sanic.response import text
 
 
@@ -23,16 +25,47 @@ class ErrorHandler:
 
     """
 
-    handlers = None
-    cached_handlers = None
-    _missing = object()
-
-    def __init__(self):
-        self.handlers = []
-        self.cached_handlers = {}
+    # Beginning in v22.3, the base renderer will be TextRenderer
+    def __init__(
+        self, fallback: str = "auto", base: Type[BaseRenderer] = HTMLRenderer
+    ):
+        self.handlers: List[Tuple[Type[BaseException], RouteHandler]] = []
+        self.cached_handlers: Dict[
+            Tuple[Type[BaseException], Optional[str]], Optional[RouteHandler]
+        ] = {}
         self.debug = False
+        self.fallback = fallback
+        self.base = base
 
-    def add(self, exception, handler):
+    @classmethod
+    def finalize(cls, error_handler):
+        if not isinstance(error_handler, cls):
+            error_logger.warning(
+                f"Error handler is non-conforming: {type(error_handler)}"
+            )
+
+        sig = signature(error_handler.lookup)
+        if len(sig.parameters) == 1:
+            error_logger.warning(
+                DeprecationWarning(
+                    "You are using a deprecated error handler. The lookup "
+                    "method should accept two positional parameters: "
+                    "(exception, route_name: Optional[str]). "
+                    "Until you upgrade your ErrorHandler.lookup, Blueprint "
+                    "specific exceptions will not work properly. Beginning "
+                    "in v22.3, the legacy style lookup method will not "
+                    "work at all."
+                ),
+            )
+            error_handler._lookup = error_handler._legacy_lookup
+
+    def _full_lookup(self, exception, route_name: Optional[str] = None):
+        return self.lookup(exception, route_name)
+
+    def _legacy_lookup(self, exception, route_name: Optional[str] = None):
+        return self.lookup(exception)
+
+    def add(self, exception, handler, route_names: Optional[List[str]] = None):
         """
         Add a new exception handler to an already existing handler object.
 
@@ -45,9 +78,16 @@ class ErrorHandler:
 
         :return: None
         """
+        # self.handlers is deprecated and will be removed in version 22.3
         self.handlers.append((exception, handler))
 
-    def lookup(self, exception):
+        if route_names:
+            for route in route_names:
+                self.cached_handlers[(exception, route)] = handler
+        else:
+            self.cached_handlers[(exception, None)] = handler
+
+    def lookup(self, exception, route_name: Optional[str] = None):
         """
         Lookup the existing instance of :class:`ErrorHandler` and fetch the
         registered handler for a specific type of exception.
@@ -61,16 +101,32 @@ class ErrorHandler:
 
         :return: Registered function if found ``None`` otherwise
         """
-        handler = self.cached_handlers.get(type(exception), self._missing)
-        if handler is self._missing:
-            for exception_class, handler in self.handlers:
-                if isinstance(exception, exception_class):
-                    self.cached_handlers[type(exception)] = handler
+        exception_class = type(exception)
+
+        for name in (route_name, None):
+            exception_key = (exception_class, name)
+            handler = self.cached_handlers.get(exception_key)
+            if handler:
+                return handler
+
+        for name in (route_name, None):
+            for ancestor in type.mro(exception_class):
+                exception_key = (ancestor, name)
+                if exception_key in self.cached_handlers:
+                    handler = self.cached_handlers[exception_key]
+                    self.cached_handlers[
+                        (exception_class, route_name)
+                    ] = handler
                     return handler
-            self.cached_handlers[type(exception)] = None
-            handler = None
+
+                if ancestor is BaseException:
+                    break
+        self.cached_handlers[(exception_class, route_name)] = None
+        handler = None
         return handler
 
+    _lookup = _full_lookup
+
     def response(self, request, exception):
         """Fetches and executes an exception handler and returns a response
         object
@@ -85,7 +141,8 @@ class ErrorHandler:
         :return: Wrap the return value obtained from :func:`default`
             or registered handler for that type of exception.
         """
-        handler = self.lookup(exception)
+        route_name = request.name if request else None
+        handler = self._lookup(exception, route_name)
         response = None
         try:
             if handler:
@@ -93,7 +150,6 @@ class ErrorHandler:
             if response is None:
                 response = self.default(request, exception)
         except Exception:
-            self.log(format_exc())
             try:
                 url = repr(request.url)
             except AttributeError:
@@ -101,7 +157,7 @@ class ErrorHandler:
             response_message = (
                 "Exception raised in exception handler " '"%s" for uri: %s'
             )
-            logger.exception(response_message, handler.__name__, url)
+            error_logger.exception(response_message, handler.__name__, url)
 
             if self.debug:
                 return text(response_message % (handler.__name__, url), 500)
@@ -109,11 +165,6 @@ class ErrorHandler:
                 return text("An error occurred while handling an error", 500)
         return response
 
-    def log(self, message, level="error"):
-        """
-        Deprecated, do not use.
-        """
-
     def default(self, request, exception):
         """
         Provide a default behavior for the objects of :class:`ErrorHandler`.
@@ -129,6 +180,17 @@ class ErrorHandler:
             :class:`Exception`
         :return:
         """
+        self.log(request, exception)
+        return exception_response(
+            request,
+            exception,
+            debug=self.debug,
+            base=self.base,
+            fallback=self.fallback,
+        )
+
+    @staticmethod
+    def log(request, exception):
         quiet = getattr(exception, "quiet", False)
         if quiet is False:
             try:
@@ -136,10 +198,9 @@ class ErrorHandler:
             except AttributeError:
                 url = "unknown"
 
-            self.log(format_exc())
-            logger.exception("Exception occurred while handling uri: %s", url)
-
-        return exception_response(request, exception, self.debug)
+            error_logger.exception(
+                "Exception occurred while handling uri: %s", url
+            )
 
 
 class ContentRangeHandler:
@@ -165,7 +226,7 @@ class ContentRangeHandler:
 
     def __init__(self, request, stats):
         self.total = stats.st_size
-        _range = request.headers.get("Range")
+        _range = request.headers.getone("range", None)
         if _range is None:
             raise HeaderNotFound("Range Header Not Found")
         unit, _, value = tuple(map(str.strip, _range.partition("=")))

sanic/headers.py

@@ -1,8 +1,11 @@
+from __future__ import annotations
+
 import re
 
 from typing import Any, Dict, Iterable, List, Optional, Tuple, Union
 from urllib.parse import unquote
 
+from sanic.exceptions import InvalidHeader
 from sanic.helpers import STATUS_CODES
 
 
@@ -30,6 +33,175 @@ _host_re = re.compile(
 # For more information, consult ../tests/test_requests.py
 
 
+def parse_arg_as_accept(f):
+    def func(self, other, *args, **kwargs):
+        if not isinstance(other, Accept) and other:
+            other = Accept.parse(other)
+        return f(self, other, *args, **kwargs)
+
+    return func
+
+
+class MediaType(str):
+    def __new__(cls, value: str):
+        return str.__new__(cls, value)
+
+    def __init__(self, value: str) -> None:
+        self.value = value
+        self.is_wildcard = self.check_if_wildcard(value)
+
+    def __eq__(self, other):
+        if self.is_wildcard:
+            return True
+
+        if self.match(other):
+            return True
+
+        other_is_wildcard = (
+            other.is_wildcard
+            if isinstance(other, MediaType)
+            else self.check_if_wildcard(other)
+        )
+
+        return other_is_wildcard
+
+    def match(self, other):
+        other_value = other.value if isinstance(other, MediaType) else other
+        return self.value == other_value
+
+    @staticmethod
+    def check_if_wildcard(value):
+        return value == "*"
+
+
+class Accept(str):
+    def __new__(cls, value: str, *args, **kwargs):
+        return str.__new__(cls, value)
+
+    def __init__(
+        self,
+        value: str,
+        type_: MediaType,
+        subtype: MediaType,
+        *,
+        q: str = "1.0",
+        **kwargs: str,
+    ):
+        qvalue = float(q)
+        if qvalue > 1 or qvalue < 0:
+            raise InvalidHeader(
+                f"Accept header qvalue must be between 0 and 1, not: {qvalue}"
+            )
+        self.value = value
+        self.type_ = type_
+        self.subtype = subtype
+        self.qvalue = qvalue
+        self.params = kwargs
+
+    def _compare(self, other, method):
+        try:
+            return method(self.qvalue, other.qvalue)
+        except (AttributeError, TypeError):
+            return NotImplemented
+
+    @parse_arg_as_accept
+    def __lt__(self, other: Union[str, Accept]):
+        return self._compare(other, lambda s, o: s < o)
+
+    @parse_arg_as_accept
+    def __le__(self, other: Union[str, Accept]):
+        return self._compare(other, lambda s, o: s <= o)
+
+    @parse_arg_as_accept
+    def __eq__(self, other: Union[str, Accept]):  # type: ignore
+        return self._compare(other, lambda s, o: s == o)
+
+    @parse_arg_as_accept
+    def __ge__(self, other: Union[str, Accept]):
+        return self._compare(other, lambda s, o: s >= o)
+
+    @parse_arg_as_accept
+    def __gt__(self, other: Union[str, Accept]):
+        return self._compare(other, lambda s, o: s > o)
+
+    @parse_arg_as_accept
+    def __ne__(self, other: Union[str, Accept]):  # type: ignore
+        return self._compare(other, lambda s, o: s != o)
+
+    @parse_arg_as_accept
+    def match(
+        self,
+        other,
+        *,
+        allow_type_wildcard: bool = True,
+        allow_subtype_wildcard: bool = True,
+    ) -> bool:
+        type_match = (
+            self.type_ == other.type_
+            if allow_type_wildcard
+            else (
+                self.type_.match(other.type_)
+                and not self.type_.is_wildcard
+                and not other.type_.is_wildcard
+            )
+        )
+        subtype_match = (
+            self.subtype == other.subtype
+            if allow_subtype_wildcard
+            else (
+                self.subtype.match(other.subtype)
+                and not self.subtype.is_wildcard
+                and not other.subtype.is_wildcard
+            )
+        )
+
+        return type_match and subtype_match
+
+    @classmethod
+    def parse(cls, raw: str) -> Accept:
+        invalid = False
+        mtype = raw.strip()
+
+        try:
+            media, *raw_params = mtype.split(";")
+            type_, subtype = media.split("/")
+        except ValueError:
+            invalid = True
+
+        if invalid or not type_ or not subtype:
+            raise InvalidHeader(f"Header contains invalid Accept value: {raw}")
+
+        params = dict(
+            [
+                (key.strip(), value.strip())
+                for key, value in (param.split("=", 1) for param in raw_params)
+            ]
+        )
+
+        return cls(mtype, MediaType(type_), MediaType(subtype), **params)
+
+
+class AcceptContainer(list):
+    def __contains__(self, o: object) -> bool:
+        return any(item.match(o) for item in self)
+
+    def match(
+        self,
+        o: object,
+        *,
+        allow_type_wildcard: bool = True,
+        allow_subtype_wildcard: bool = True,
+    ) -> bool:
+        return any(
+            item.match(
+                o,
+                allow_type_wildcard=allow_type_wildcard,
+                allow_subtype_wildcard=allow_subtype_wildcard,
+            )
+            for item in self
+        )
+
+
 def parse_content_header(value: str) -> Tuple[str, Options]:
     """Parse content-type and content-disposition header values.
 
@@ -102,7 +274,7 @@ def parse_xforwarded(headers, config) -> Optional[Options]:
     """Parse traditional proxy headers."""
     real_ip_header = config.REAL_IP_HEADER
     proxies_count = config.PROXIES_COUNT
-    addr = real_ip_header and headers.get(real_ip_header)
+    addr = real_ip_header and headers.getone(real_ip_header, None)
     if not addr and proxies_count:
         assert proxies_count > 0
         try:
@@ -131,7 +303,7 @@ def parse_xforwarded(headers, config) -> Optional[Options]:
             ("port", "x-forwarded-port"),
             ("path", "x-forwarded-path"),
         ):
-            yield key, headers.get(header)
+            yield key, headers.getone(header, None)
 
     return fwd_normalize(options())
 
@@ -194,3 +366,31 @@ def format_http1_response(status: int, headers: HeaderBytesIterable) -> bytes:
         ret += b"%b: %b\r\n" % h
     ret += b"\r\n"
     return ret
+
+
+def _sort_accept_value(accept: Accept):
+    return (
+        accept.qvalue,
+        len(accept.params),
+        accept.subtype != "*",
+        accept.type_ != "*",
+    )
+
+
+def parse_accept(accept: str) -> AcceptContainer:
+    """Parse an Accept header and order the acceptable media types in
+    accorsing to RFC 7231, s. 5.3.2
+    https://datatracker.ietf.org/doc/html/rfc7231#section-5.3.2
+    """
+    media_types = accept.split(",")
+    accept_list: List[Accept] = []
+
+    for mtype in media_types:
+        if not mtype:
+            continue
+
+        accept_list.append(Accept.parse(mtype))
+
+    return AcceptContainer(
+        sorted(accept_list, key=_sort_accept_value, reverse=True)
+    )

sanic/helpers.py

@@ -155,3 +155,17 @@ def import_string(module_name, package=None):
     if ismodule(obj):
         return obj
     return obj()
+
+
+class Default:
+    """
+    It is used to replace `None` or `object()` as a sentinel
+    that represents a default value. Sometimes we want to set
+    a value to `None` so we cannot use `None` to represent the
+    default value, and `object()` is hard to be typed.
+    """
+
+    pass
+
+
+_default = Default()

sanic/http.py

@@ -20,7 +20,8 @@ from sanic.exceptions import (
 )
 from sanic.headers import format_http1_response
 from sanic.helpers import has_message_body
-from sanic.log import access_logger, logger
+from sanic.log import access_logger, error_logger, logger
+from sanic.touchup import TouchUpMeta
 
 
 class Stage(Enum):
@@ -45,7 +46,7 @@ class Stage(Enum):
 HTTP_CONTINUE = b"HTTP/1.1 100 Continue\r\n\r\n"
 
 
-class Http:
+class Http(metaclass=TouchUpMeta):
     """
     Internal helper for managing the HTTP request/response cycle
 
@@ -64,9 +65,18 @@ class Http:
     :raises RuntimeError:
     """
 
+    HEADER_CEILING = 16_384
+    HEADER_MAX_SIZE = 0
+
+    __touchup__ = (
+        "http1_request_header",
+        "http1_response_header",
+        "read",
+    )
     __slots__ = [
         "_send",
         "_receive_more",
+        "dispatch",
         "recv_buffer",
         "protocol",
         "expecting_continue",
@@ -82,6 +92,7 @@ class Http:
         "request_max_size",
         "response",
         "response_func",
+        "response_size",
         "response_bytes_left",
         "upgrade_websocket",
     ]
@@ -91,19 +102,24 @@ class Http:
         self._receive_more = protocol.receive_more
         self.recv_buffer = protocol.recv_buffer
         self.protocol = protocol
-        self.expecting_continue: bool = False
+        self.keep_alive = True
         self.stage: Stage = Stage.IDLE
+        self.dispatch = self.protocol.app.dispatch
+        self.init_for_request()
+
+    def init_for_request(self):
+        """Init/reset all per-request variables."""
+        self.exception = None
+        self.expecting_continue: bool = False
+        self.head_only = None
         self.request_body = None
         self.request_bytes = None
         self.request_bytes_left = None
-        self.request_max_size = protocol.request_max_size
-        self.keep_alive = True
-        self.head_only = None
+        self.request_max_size = self.protocol.request_max_size
         self.request: Request = None
         self.response: BaseHTTPResponse = None
-        self.exception = None
-        self.url = None
         self.upgrade_websocket = False
+        self.url = None
 
     def __bool__(self):
         """Test if request handling is in progress"""
@@ -132,6 +148,12 @@ class Http:
                     await self.response.send(end_stream=True)
             except CancelledError:
                 # Write an appropriate response before exiting
+                if not self.protocol.transport:
+                    logger.info(
+                        f"Request: {self.request.method} {self.request.url} "
+                        "stopped. Transport is closed."
+                    )
+                    return
                 e = self.exception or ServiceUnavailable("Cancelled")
                 self.exception = None
                 self.keep_alive = False
@@ -143,8 +165,11 @@ class Http:
             # Try to consume any remaining request body
             if self.request_body:
                 if self.response and 200 <= self.response.status < 300:
-                    logger.error(f"{self.request} body not consumed.")
-
+                    error_logger.error(f"{self.request} body not consumed.")
+                # Limit the size because the handler may have set it infinite
+                self.request_max_size = min(
+                    self.request_max_size, self.protocol.request_max_size
+                )
                 try:
                     async for _ in self:
                         pass
@@ -156,19 +181,26 @@ class Http:
                     await sleep(0.001)
                     self.keep_alive = False
 
+            # Clean up to free memory and for the next request
+            if self.request:
+                self.request.stream = None
+                if self.response:
+                    self.response.stream = None
+
             # Exit and disconnect if no more requests can be taken
             if self.stage is not Stage.IDLE or not self.keep_alive:
                 break
 
-            # Wait for next request
+            self.init_for_request()
+
+            # Wait for the next request
             if not self.recv_buffer:
                 await self._receive_more()
 
-    async def http1_request_header(self):
+    async def http1_request_header(self):  # no cov
         """
         Receive and parse request header into self.request.
         """
-        HEADER_MAX_SIZE = min(8192, self.request_max_size)
         # Receive until full header is in buffer
         buf = self.recv_buffer
         pos = 0
@@ -179,12 +211,12 @@ class Http:
                 break
 
             pos = max(0, len(buf) - 3)
-            if pos >= HEADER_MAX_SIZE:
+            if pos >= self.HEADER_MAX_SIZE:
                 break
 
             await self._receive_more()
 
-        if pos >= HEADER_MAX_SIZE:
+        if pos >= self.HEADER_MAX_SIZE:
             raise PayloadTooLarge("Request header exceeds the size limit")
 
         # Parse header content
@@ -194,6 +226,12 @@ class Http:
             reqline, *split_headers = raw_headers.split("\r\n")
             method, self.url, protocol = reqline.split(" ")
 
+            await self.dispatch(
+                "http.lifecycle.read_head",
+                inline=True,
+                context={"head": bytes(head)},
+            )
+
             if protocol == "HTTP/1.1":
                 self.keep_alive = True
             elif protocol == "HTTP/1.0":
@@ -218,7 +256,9 @@ class Http:
             raise InvalidUsage("Bad Request")
 
         headers_instance = Header(headers)
-        self.upgrade_websocket = headers_instance.get("upgrade") == "websocket"
+        self.upgrade_websocket = (
+            headers_instance.getone("upgrade", "").lower() == "websocket"
+        )
 
         # Prepare a Request object
         request = self.protocol.request_class(
@@ -230,12 +270,17 @@ class Http:
             transport=self.protocol.transport,
             app=self.protocol.app,
         )
+        await self.dispatch(
+            "http.lifecycle.request",
+            inline=True,
+            context={"request": request},
+        )
 
         # Prepare for request body
         self.request_bytes_left = self.request_bytes = 0
         if request_body:
             headers = request.headers
-            expect = headers.get("expect")
+            expect = headers.getone("expect", None)
 
             if expect is not None:
                 if expect.lower() == "100-continue":
@@ -243,7 +288,7 @@ class Http:
                 else:
                     raise HeaderExpectationFailed(f"Unknown Expect: {expect}")
 
-            if headers.get("transfer-encoding") == "chunked":
+            if headers.getone("transfer-encoding", None) == "chunked":
                 self.request_body = "chunked"
                 pos -= 2  # One CRLF stays in buffer
             else:
@@ -260,7 +305,7 @@ class Http:
 
     async def http1_response_header(
         self, data: bytes, end_stream: bool
-    ) -> None:
+    ) -> None:  # no cov
         res = self.response
 
         # Compatibility with simple response body
@@ -270,6 +315,7 @@ class Http:
         size = len(data)
         headers = res.headers
         status = res.status
+        self.response_size = size
 
         if not isinstance(status, int) or status < 200:
             raise RuntimeError(f"Invalid response status {status!r}")
@@ -424,13 +470,15 @@ class Http:
         req, res = self.request, self.response
         extra = {
             "status": getattr(res, "status", 0),
-            "byte": getattr(self, "response_bytes_left", -1),
+            "byte": getattr(
+                self, "response_bytes_left", getattr(self, "response_size", -1)
+            ),
             "host": "UNKNOWN",
             "request": "nil",
         }
         if req is not None:
-            if req.ip:
-                extra["host"] = f"{req.ip}:{req.port}"
+            if req.remote_addr or req.ip:
+                extra["host"] = f"{req.remote_addr or req.ip}:{req.port}"
             extra["request"] = f"{req.method} {req.url}"
         access_logger.info("", extra=extra)
 
@@ -446,7 +494,7 @@ class Http:
             if data:
                 yield data
 
-    async def read(self) -> Optional[bytes]:
+    async def read(self) -> Optional[bytes]:  # no cov
         """
         Read some bytes of request body.
         """
@@ -478,8 +526,6 @@ class Http:
                 self.keep_alive = False
                 raise InvalidUsage("Bad chunked encoding")
 
-            del buf[: pos + 2]
-
             if size <= 0:
                 self.request_body = None
 
@@ -487,8 +533,17 @@ class Http:
                     self.keep_alive = False
                     raise InvalidUsage("Bad chunked encoding")
 
+                # Consume CRLF, chunk size 0 and the two CRLF that follow
+                pos += 4
+                # Might need to wait for the final CRLF
+                while len(buf) < pos:
+                    await self._receive_more()
+                del buf[:pos]
                 return None
 
+            # Remove CRLF, chunk size and the CRLF that follows
+            del buf[: pos + 2]
+
             self.request_bytes_left = size
             self.request_bytes += size
 
@@ -513,6 +568,12 @@ class Http:
 
         self.request_bytes_left -= size
 
+        await self.dispatch(
+            "http.lifecycle.read_body",
+            inline=True,
+            context={"body": data},
+        )
+
         return data
 
     # Response methods
@@ -535,3 +596,10 @@ class Http:
     @property
     def send(self):
         return self.response_func
+
+    @classmethod
+    def set_header_max_size(cls, *sizes: int):
+        cls.HEADER_MAX_SIZE = min(
+            *sizes,
+            cls.HEADER_CEILING,
+        )

sanic/mixins/listeners.py

@@ -1,18 +1,19 @@
 from enum import Enum, auto
 from functools import partial
-from typing import Any, Callable, Coroutine, List, Optional, Union
+from typing import List, Optional, Union
 
 from sanic.models.futures import FutureListener
+from sanic.models.handler_types import ListenerType
 
 
 class ListenerEvent(str, Enum):
     def _generate_next_value_(name: str, *args) -> str:  # type: ignore
         return name.lower()
 
-    BEFORE_SERVER_START = auto()
-    AFTER_SERVER_START = auto()
-    BEFORE_SERVER_STOP = auto()
-    AFTER_SERVER_STOP = auto()
+    BEFORE_SERVER_START = "server.init.before"
+    AFTER_SERVER_START = "server.init.after"
+    BEFORE_SERVER_STOP = "server.shutdown.before"
+    AFTER_SERVER_STOP = "server.shutdown.after"
     MAIN_PROCESS_START = auto()
     MAIN_PROCESS_STOP = auto()
 
@@ -26,16 +27,14 @@ class ListenerMixin:
 
     def listener(
         self,
-        listener_or_event: Union[
-            Callable[..., Coroutine[Any, Any, None]], str
-        ],
+        listener_or_event: Union[ListenerType, str],
         event_or_none: Optional[str] = None,
         apply: bool = True,
     ):
         """
         Create a listener from a decorated function.
 
-        To be used as a deocrator:
+        To be used as a decorator:
 
         .. code-block:: python
 
@@ -63,20 +62,20 @@ class ListenerMixin:
         else:
             return partial(register_listener, event=listener_or_event)
 
-    def main_process_start(self, listener):
+    def main_process_start(self, listener: ListenerType) -> ListenerType:
         return self.listener(listener, "main_process_start")
 
-    def main_process_stop(self, listener):
+    def main_process_stop(self, listener: ListenerType) -> ListenerType:
         return self.listener(listener, "main_process_stop")
 
-    def before_server_start(self, listener):
+    def before_server_start(self, listener: ListenerType) -> ListenerType:
         return self.listener(listener, "before_server_start")
 
-    def after_server_start(self, listener):
+    def after_server_start(self, listener: ListenerType) -> ListenerType:
         return self.listener(listener, "after_server_start")
 
-    def before_server_stop(self, listener):
+    def before_server_stop(self, listener: ListenerType) -> ListenerType:
         return self.listener(listener, "before_server_stop")
 
-    def after_server_stop(self, listener):
+    def after_server_stop(self, listener: ListenerType) -> ListenerType:
         return self.listener(listener, "after_server_stop")

sanic/mixins/routes.py

@@ -1,17 +1,20 @@
+from ast import NodeVisitor, Return, parse
 from functools import partial, wraps
-from inspect import signature
+from inspect import getsource, signature
 from mimetypes import guess_type
 from os import path
 from pathlib import PurePath
 from re import sub
+from textwrap import dedent
 from time import gmtime, strftime
-from typing import Iterable, List, Optional, Set, Union
+from typing import Any, Callable, Iterable, List, Optional, Set, Tuple, Union
 from urllib.parse import unquote
 
 from sanic_routing.route import Route  # type: ignore
 
 from sanic.compat import stat_async
 from sanic.constants import DEFAULT_HTTP_CONTENT_TYPE, HTTP_METHODS
+from sanic.errorpages import RESPONSE_MAPPING
 from sanic.exceptions import (
     ContentRangeError,
     FileNotFound,
@@ -21,15 +24,22 @@ from sanic.exceptions import (
 from sanic.handlers import ContentRangeHandler
 from sanic.log import error_logger
 from sanic.models.futures import FutureRoute, FutureStatic
+from sanic.models.handler_types import RouteHandler
 from sanic.response import HTTPResponse, file, file_stream
 from sanic.views import CompositionView
 
 
+RouteWrapper = Callable[
+    [RouteHandler], Union[RouteHandler, Tuple[Route, RouteHandler]]
+]
+
+
 class RouteMixin:
+    name: str
+
     def __init__(self, *args, **kwargs) -> None:
         self._future_routes: Set[FutureRoute] = set()
         self._future_statics: Set[FutureStatic] = set()
-        self.name = ""
         self.strict_slashes: Optional[bool] = False
 
     def _apply_route(self, route: FutureRoute) -> List[Route]:
@@ -45,7 +55,7 @@ class RouteMixin:
         host: Optional[str] = None,
         strict_slashes: Optional[bool] = None,
         stream: bool = False,
-        version: Optional[int] = None,
+        version: Optional[Union[int, str, float]] = None,
         name: Optional[str] = None,
         ignore_body: bool = False,
         apply: bool = True,
@@ -53,7 +63,9 @@ class RouteMixin:
         websocket: bool = False,
         unquote: bool = False,
         static: bool = False,
-    ):
+        version_prefix: str = "/v",
+        error_format: Optional[str] = None,
+    ) -> RouteWrapper:
         """
         Decorate a function to be registered as a route
 
@@ -66,6 +78,8 @@ class RouteMixin:
         :param name: user defined route name for url_for
         :param ignore_body: whether the handler should ignore request
             body (eg. GET requests)
+        :param version_prefix: URL path that should be before the version
+            value; default: ``/v``
         :return: tuple of routes, decorated function
         """
 
@@ -92,6 +106,8 @@ class RouteMixin:
             nonlocal subprotocols
             nonlocal websocket
             nonlocal static
+            nonlocal version_prefix
+            nonlocal error_format
 
             if isinstance(handler, tuple):
                 # if a handler fn is already wrapped in a route, the handler
@@ -110,10 +126,16 @@ class RouteMixin:
                         "Expected either string or Iterable of host strings, "
                         "not %s" % host
                     )
-
-            if isinstance(subprotocols, (list, tuple, set)):
+            if isinstance(subprotocols, list):
+                # Ordered subprotocols, maintain order
+                subprotocols = tuple(subprotocols)
+            elif isinstance(subprotocols, set):
+                # subprotocol is unordered, keep it unordered
                 subprotocols = frozenset(subprotocols)
 
+            if not error_format or error_format == "auto":
+                error_format = self._determine_error_format(handler)
+
             route = FutureRoute(
                 handler,
                 uri,
@@ -128,6 +150,8 @@ class RouteMixin:
                 subprotocols,
                 unquote,
                 static,
+                version_prefix,
+                error_format,
             )
 
             self._future_routes.add(route)
@@ -154,13 +178,15 @@ class RouteMixin:
             if apply:
                 self._apply_route(route)
 
-            return route, handler
+            if static:
+                return route, handler
+            return handler
 
         return decorator
 
     def add_route(
         self,
-        handler,
+        handler: RouteHandler,
         uri: str,
         methods: Iterable[str] = frozenset({"GET"}),
         host: Optional[str] = None,
@@ -168,7 +194,9 @@ class RouteMixin:
         version: Optional[int] = None,
         name: Optional[str] = None,
         stream: bool = False,
-    ):
+        version_prefix: str = "/v",
+        error_format: Optional[str] = None,
+    ) -> RouteHandler:
         """A helper method to register class instance or
         functions as a handler to the application url
         routes.
@@ -182,6 +210,8 @@ class RouteMixin:
         :param version:
         :param name: user defined route name for url_for
         :param stream: boolean specifying if the handler is a stream handler
+        :param version_prefix: URL path that should be before the version
+            value; default: ``/v``
         :return: function or class instance
         """
         # Handle HTTPMethodView differently
@@ -189,7 +219,8 @@ class RouteMixin:
             methods = set()
 
             for method in HTTP_METHODS:
-                _handler = getattr(handler.view_class, method.lower(), None)
+                view_class = getattr(handler, "view_class")
+                _handler = getattr(view_class, method.lower(), None)
                 if _handler:
                     methods.add(method)
                     if hasattr(_handler, "is_stream"):
@@ -214,6 +245,8 @@ class RouteMixin:
             stream=stream,
             version=version,
             name=name,
+            version_prefix=version_prefix,
+            error_format=error_format,
         )(handler)
         return handler
 
@@ -226,7 +259,9 @@ class RouteMixin:
         version: Optional[int] = None,
         name: Optional[str] = None,
         ignore_body: bool = True,
-    ):
+        version_prefix: str = "/v",
+        error_format: Optional[str] = None,
+    ) -> RouteWrapper:
         """
         Add an API URL under the **GET** *HTTP* method
 
@@ -236,6 +271,8 @@ class RouteMixin:
             URLs need to terminate with a */*
         :param version: API Version
         :param name: Unique name that can be used to identify the Route
+        :param version_prefix: URL path that should be before the version
+            value; default: ``/v``
         :return: Object decorated with :func:`route` method
         """
         return self.route(
@@ -246,6 +283,8 @@ class RouteMixin:
             version=version,
             name=name,
             ignore_body=ignore_body,
+            version_prefix=version_prefix,
+            error_format=error_format,
         )
 
     def post(
@@ -256,7 +295,9 @@ class RouteMixin:
         stream: bool = False,
         version: Optional[int] = None,
         name: Optional[str] = None,
-    ):
+        version_prefix: str = "/v",
+        error_format: Optional[str] = None,
+    ) -> RouteWrapper:
         """
         Add an API URL under the **POST** *HTTP* method
 
@@ -266,6 +307,8 @@ class RouteMixin:
             URLs need to terminate with a */*
         :param version: API Version
         :param name: Unique name that can be used to identify the Route
+        :param version_prefix: URL path that should be before the version
+            value; default: ``/v``
         :return: Object decorated with :func:`route` method
         """
         return self.route(
@@ -276,6 +319,8 @@ class RouteMixin:
             stream=stream,
             version=version,
             name=name,
+            version_prefix=version_prefix,
+            error_format=error_format,
         )
 
     def put(
@@ -286,7 +331,9 @@ class RouteMixin:
         stream: bool = False,
         version: Optional[int] = None,
         name: Optional[str] = None,
-    ):
+        version_prefix: str = "/v",
+        error_format: Optional[str] = None,
+    ) -> RouteWrapper:
         """
         Add an API URL under the **PUT** *HTTP* method
 
@@ -296,6 +343,8 @@ class RouteMixin:
             URLs need to terminate with a */*
         :param version: API Version
         :param name: Unique name that can be used to identify the Route
+        :param version_prefix: URL path that should be before the version
+            value; default: ``/v``
         :return: Object decorated with :func:`route` method
         """
         return self.route(
@@ -306,6 +355,8 @@ class RouteMixin:
             stream=stream,
             version=version,
             name=name,
+            version_prefix=version_prefix,
+            error_format=error_format,
         )
 
     def head(
@@ -316,7 +367,9 @@ class RouteMixin:
         version: Optional[int] = None,
         name: Optional[str] = None,
         ignore_body: bool = True,
-    ):
+        version_prefix: str = "/v",
+        error_format: Optional[str] = None,
+    ) -> RouteWrapper:
         """
         Add an API URL under the **HEAD** *HTTP* method
 
@@ -334,6 +387,8 @@ class RouteMixin:
         :param ignore_body: whether the handler should ignore request
             body (eg. GET requests), defaults to True
         :type ignore_body: bool, optional
+        :param version_prefix: URL path that should be before the version
+            value; default: ``/v``
         :return: Object decorated with :func:`route` method
         """
         return self.route(
@@ -344,6 +399,8 @@ class RouteMixin:
             version=version,
             name=name,
             ignore_body=ignore_body,
+            version_prefix=version_prefix,
+            error_format=error_format,
         )
 
     def options(
@@ -354,7 +411,9 @@ class RouteMixin:
         version: Optional[int] = None,
         name: Optional[str] = None,
         ignore_body: bool = True,
-    ):
+        version_prefix: str = "/v",
+        error_format: Optional[str] = None,
+    ) -> RouteWrapper:
         """
         Add an API URL under the **OPTIONS** *HTTP* method
 
@@ -372,6 +431,8 @@ class RouteMixin:
         :param ignore_body: whether the handler should ignore request
             body (eg. GET requests), defaults to True
         :type ignore_body: bool, optional
+        :param version_prefix: URL path that should be before the version
+            value; default: ``/v``
         :return: Object decorated with :func:`route` method
         """
         return self.route(
@@ -382,6 +443,8 @@ class RouteMixin:
             version=version,
             name=name,
             ignore_body=ignore_body,
+            version_prefix=version_prefix,
+            error_format=error_format,
         )
 
     def patch(
@@ -392,7 +455,9 @@ class RouteMixin:
         stream=False,
         version: Optional[int] = None,
         name: Optional[str] = None,
-    ):
+        version_prefix: str = "/v",
+        error_format: Optional[str] = None,
+    ) -> RouteWrapper:
         """
         Add an API URL under the **PATCH** *HTTP* method
 
@@ -412,6 +477,8 @@ class RouteMixin:
         :param ignore_body: whether the handler should ignore request
             body (eg. GET requests), defaults to True
         :type ignore_body: bool, optional
+        :param version_prefix: URL path that should be before the version
+            value; default: ``/v``
         :return: Object decorated with :func:`route` method
         """
         return self.route(
@@ -422,6 +489,8 @@ class RouteMixin:
             stream=stream,
             version=version,
             name=name,
+            version_prefix=version_prefix,
+            error_format=error_format,
         )
 
     def delete(
@@ -432,7 +501,9 @@ class RouteMixin:
         version: Optional[int] = None,
         name: Optional[str] = None,
         ignore_body: bool = True,
-    ):
+        version_prefix: str = "/v",
+        error_format: Optional[str] = None,
+    ) -> RouteWrapper:
         """
         Add an API URL under the **DELETE** *HTTP* method
 
@@ -442,6 +513,8 @@ class RouteMixin:
             URLs need to terminate with a */*
         :param version: API Version
         :param name: Unique name that can be used to identify the Route
+        :param version_prefix: URL path that should be before the version
+            value; default: ``/v``
         :return: Object decorated with :func:`route` method
         """
         return self.route(
@@ -452,6 +525,8 @@ class RouteMixin:
             version=version,
             name=name,
             ignore_body=ignore_body,
+            version_prefix=version_prefix,
+            error_format=error_format,
         )
 
     def websocket(
@@ -463,6 +538,8 @@ class RouteMixin:
         version: Optional[int] = None,
         name: Optional[str] = None,
         apply: bool = True,
+        version_prefix: str = "/v",
+        error_format: Optional[str] = None,
     ):
         """
         Decorate a function to be registered as a websocket route
@@ -474,6 +551,8 @@ class RouteMixin:
         :param subprotocols: optional list of str with supported subprotocols
         :param name: A unique name assigned to the URL so that it can
                      be used with :func:`url_for`
+        :param version_prefix: URL path that should be before the version
+            value; default: ``/v``
         :return: tuple of routes, decorated function
         """
         return self.route(
@@ -486,6 +565,8 @@ class RouteMixin:
             apply=apply,
             subprotocols=subprotocols,
             websocket=True,
+            version_prefix=version_prefix,
+            error_format=error_format,
         )
 
     def add_websocket_route(
@@ -497,6 +578,8 @@ class RouteMixin:
         subprotocols=None,
         version: Optional[int] = None,
         name: Optional[str] = None,
+        version_prefix: str = "/v",
+        error_format: Optional[str] = None,
     ):
         """
         A helper method to register a function as a websocket route.
@@ -513,6 +596,8 @@ class RouteMixin:
                 handshake
         :param name: A unique name assigned to the URL so that it can
                 be used with :func:`url_for`
+        :param version_prefix: URL path that should be before the version
+            value; default: ``/v``
         :return: Objected decorated by :func:`websocket`
         """
         return self.websocket(
@@ -522,6 +607,8 @@ class RouteMixin:
             subprotocols=subprotocols,
             version=version,
             name=name,
+            version_prefix=version_prefix,
+            error_format=error_format,
         )(handler)
 
     def static(
@@ -537,6 +624,7 @@ class RouteMixin:
         strict_slashes=None,
         content_type=None,
         apply=True,
+        resource_type=None,
     ):
         """
         Register a root to serve files from. The input can either be a
@@ -586,6 +674,7 @@ class RouteMixin:
             host,
             strict_slashes,
             content_type,
+            resource_type,
         )
         self._future_statics.add(static)
 
@@ -665,7 +754,10 @@ class RouteMixin:
                 modified_since = strftime(
                     "%a, %d %b %Y %H:%M:%S GMT", gmtime(stats.st_mtime)
                 )
-                if request.headers.get("If-Modified-Since") == modified_since:
+                if (
+                    request.headers.getone("if-modified-since", None)
+                    == modified_since
+                ):
                     return HTTPResponse(status=304)
                 headers["Last-Modified"] = modified_since
             _range = None
@@ -718,16 +810,19 @@ class RouteMixin:
                 return await file(file_path, headers=headers, _range=_range)
         except ContentRangeError:
             raise
-        except Exception:
-            error_logger.exception(
-                f"File not found: path={file_or_directory}, "
-                f"relative_url={__file_uri__}"
-            )
+        except FileNotFoundError:
             raise FileNotFound(
                 "File not found",
                 path=file_or_directory,
                 relative_url=__file_uri__,
             )
+        except Exception:
+            error_logger.exception(
+                f"Exception in static request handler: "
+                f"path={file_or_directory}, "
+                f"relative_url={__file_uri__}"
+            )
+            raise
 
     def _register_static(
         self,
@@ -775,8 +870,27 @@ class RouteMixin:
         name = static.name
         # If we're not trying to match a file directly,
         # serve from the folder
-        if not path.isfile(file_or_directory):
+        if not static.resource_type:
+            if not path.isfile(file_or_directory):
+                uri += "/<__file_uri__:path>"
+        elif static.resource_type == "dir":
+            if path.isfile(file_or_directory):
+                raise TypeError(
+                    "Resource type improperly identified as directory. "
+                    f"'{file_or_directory}'"
+                )
             uri += "/<__file_uri__:path>"
+        elif static.resource_type == "file" and not path.isfile(
+            file_or_directory
+        ):
+            raise TypeError(
+                "Resource type improperly identified as file. "
+                f"'{file_or_directory}'"
+            )
+        elif static.resource_type != "file":
+            raise ValueError(
+                "The resource_type should be set to 'file' or 'dir'"
+            )
 
         # special prefix for static files
         # if not static.name.startswith("_static_"):
@@ -793,7 +907,7 @@ class RouteMixin:
             )
         )
 
-        route, _ = self.route(
+        route, _ = self.route(  # type: ignore
             uri=uri,
             methods=["GET", "HEAD"],
             name=name,
@@ -803,3 +917,43 @@ class RouteMixin:
         )(_handler)
 
         return route
+
+    def _determine_error_format(self, handler) -> str:
+        if not isinstance(handler, CompositionView):
+            try:
+                src = dedent(getsource(handler))
+                tree = parse(src)
+                http_response_types = self._get_response_types(tree)
+
+                if len(http_response_types) == 1:
+                    return next(iter(http_response_types))
+            except (OSError, TypeError):
+                ...
+
+        return "auto"
+
+    def _get_response_types(self, node):
+        types = set()
+
+        class HttpResponseVisitor(NodeVisitor):
+            def visit_Return(self, node: Return) -> Any:
+                nonlocal types
+
+                try:
+                    checks = [node.value.func.id]  # type: ignore
+                    if node.value.keywords:  # type: ignore
+                        checks += [
+                            k.value
+                            for k in node.value.keywords  # type: ignore
+                            if k.arg == "content_type"
+                        ]
+
+                    for check in checks:
+                        if check in RESPONSE_MAPPING:
+                            types.add(RESPONSE_MAPPING[check])
+                except AttributeError:
+                    ...
+
+        HttpResponseVisitor().visit(node)
+
+        return types

sanic/mixins/signals.py

@@ -1,4 +1,4 @@
-from typing import Any, Callable, Dict, Set
+from typing import Any, Callable, Dict, Optional, Set
 
 from sanic.models.futures import FutureSignal
 from sanic.models.handler_types import SignalHandler
@@ -23,7 +23,7 @@ class SignalMixin:
         *,
         apply: bool = True,
         condition: Dict[str, Any] = None,
-    ) -> Callable[[SignalHandler], FutureSignal]:
+    ) -> Callable[[SignalHandler], SignalHandler]:
         """
         For creating a signal handler, used similar to a route handler:
 
@@ -54,16 +54,22 @@ class SignalMixin:
             if apply:
                 self._apply_signal(future_signal)
 
-            return future_signal
+            return handler
 
         return decorator
 
     def add_signal(
         self,
-        handler,
+        handler: Optional[Callable[..., Any]],
         event: str,
         condition: Dict[str, Any] = None,
     ):
+        if not handler:
+
+            async def noop():
+                ...
+
+            handler = noop
         self.signal(event=event, condition=condition)(handler)
         return handler
 

sanic/models/asgi.py

@@ -3,7 +3,7 @@ import asyncio
 from typing import Any, Awaitable, Callable, MutableMapping, Optional, Union
 
 from sanic.exceptions import InvalidUsage
-from sanic.websocket import WebSocketConnection
+from sanic.server.websockets.connection import WebSocketConnection
 
 
 ASGIScope = MutableMapping[str, Any]

sanic/models/futures.py

@@ -23,6 +23,8 @@ class FutureRoute(NamedTuple):
     subprotocols: Optional[List[str]]
     unquote: bool
     static: bool
+    version_prefix: str
+    error_format: Optional[str]
 
 
 class FutureListener(NamedTuple):
@@ -51,6 +53,7 @@ class FutureStatic(NamedTuple):
     host: Optional[str]
     strict_slashes: Optional[bool]
     content_type: Optional[bool]
+    resource_type: Optional[str]
 
 
 class FutureSignal(NamedTuple):

sanic/models/handler_types.py

@@ -21,5 +21,5 @@ MiddlewareType = Union[RequestMiddlewareType, ResponseMiddlewareType]
 ListenerType = Callable[
     [Sanic, AbstractEventLoop], Optional[Coroutine[Any, Any, None]]
 ]
-RouteHandler = Callable[..., Coroutine[Any, Any, HTTPResponse]]
+RouteHandler = Callable[..., Coroutine[Any, Any, Optional[HTTPResponse]]]
 SignalHandler = Callable[..., Coroutine[Any, Any, None]]

sanic/models/server_types.py

@@ -0,0 +1,52 @@
+from types import SimpleNamespace
+
+from sanic.models.protocol_types import TransportProtocol
+
+
+class Signal:
+    stopped = False
+
+
+class ConnInfo:
+    """
+    Local and remote addresses and SSL status info.
+    """
+
+    __slots__ = (
+        "client_port",
+        "client",
+        "client_ip",
+        "ctx",
+        "peername",
+        "server_port",
+        "server",
+        "sockname",
+        "ssl",
+    )
+
+    def __init__(self, transport: TransportProtocol, unix=None):
+        self.ctx = SimpleNamespace()
+        self.peername = None
+        self.server = self.client = ""
+        self.server_port = self.client_port = 0
+        self.client_ip = ""
+        self.sockname = addr = transport.get_extra_info("sockname")
+        self.ssl: bool = bool(transport.get_extra_info("sslcontext"))
+
+        if isinstance(addr, str):  # UNIX socket
+            self.server = unix or addr
+            return
+
+        # IPv4 (ip, port) or IPv6 (ip, port, flowinfo, scopeid)
+        if isinstance(addr, tuple):
+            self.server = addr[0] if len(addr) == 2 else f"[{addr[0]}]"
+            self.server_port = addr[1]
+            # self.server gets non-standard port appended
+            if addr[1] != (443 if self.ssl else 80):
+                self.server = f"{self.server}:{addr[1]}"
+        self.peername = addr = transport.get_extra_info("peername")
+
+        if isinstance(addr, tuple):
+            self.client = addr[0] if len(addr) == 2 else f"[{addr[0]}]"
+            self.client_ip = addr[0]
+            self.client_port = addr[1]

sanic/reloader_helpers.py

@@ -1,3 +1,4 @@
+import itertools
 import os
 import signal
 import subprocess
@@ -5,6 +6,9 @@ import sys
 
 from time import sleep
 
+from sanic.config import BASE_LOGO
+from sanic.log import logger
+
 
 def _iter_module_files():
     """This iterates over all relevant Python files.
@@ -56,7 +60,21 @@ def restart_with_reloader():
     )
 
 
-def watchdog(sleep_interval):
+def _check_file(filename, mtimes):
+    need_reload = False
+
+    mtime = os.stat(filename).st_mtime
+    old_time = mtimes.get(filename)
+    if old_time is None:
+        mtimes[filename] = mtime
+    elif mtime > old_time:
+        mtimes[filename] = mtime
+        need_reload = True
+
+    return need_reload
+
+
+def watchdog(sleep_interval, app):
     """Watch project files, restart worker process if a change happened.
 
     :param sleep_interval: interval in second.
@@ -73,21 +91,25 @@ def watchdog(sleep_interval):
 
     worker_process = restart_with_reloader()
 
+    if app.config.LOGO:
+        logger.debug(
+            app.config.LOGO if isinstance(app.config.LOGO, str) else BASE_LOGO
+        )
+
     try:
         while True:
             need_reload = False
 
-            for filename in _iter_module_files():
+            for filename in itertools.chain(
+                _iter_module_files(),
+                *(d.glob("**/*") for d in app.reload_dirs),
+            ):
                 try:
-                    mtime = os.stat(filename).st_mtime
+                    check = _check_file(filename, mtimes)
                 except OSError:
                     continue
 
-                old_time = mtimes.get(filename)
-                if old_time is None:
-                    mtimes[filename] = mtime
-                elif mtime > old_time:
-                    mtimes[filename] = mtime
+                if check:
                     need_reload = True
 
             if need_reload:

sanic/request.py

@@ -34,7 +34,9 @@ from sanic.compat import CancelledErrors, Header
 from sanic.constants import DEFAULT_HTTP_CONTENT_TYPE
 from sanic.exceptions import InvalidUsage
 from sanic.headers import (
+    AcceptContainer,
     Options,
+    parse_accept,
     parse_content_header,
     parse_forwarded,
     parse_host,
@@ -94,6 +96,7 @@ class Request:
         "head",
         "headers",
         "method",
+        "parsed_accept",
         "parsed_args",
         "parsed_not_grouped_args",
         "parsed_files",
@@ -125,7 +128,7 @@ class Request:
         self._name: Optional[str] = None
         self.app = app
 
-        self.headers = headers
+        self.headers = Header(headers)
         self.version = version
         self.method = method
         self.transport = transport
@@ -136,6 +139,7 @@ class Request:
         self.conn_info: Optional[ConnInfo] = None
         self.ctx = SimpleNamespace()
         self.parsed_forwarded: Optional[Options] = None
+        self.parsed_accept: Optional[AcceptContainer] = None
         self.parsed_json = None
         self.parsed_form = None
         self.parsed_files = None
@@ -262,7 +266,7 @@ class Request:
             app = Sanic("MyApp", request_class=IntRequest)
         """
         if not self._id:
-            self._id = self.headers.get(
+            self._id = self.headers.getone(
                 self.app.config.REQUEST_ID_HEADER,
                 self.__class__.generate_id(self),  # type: ignore
             )
@@ -296,6 +300,13 @@ class Request:
 
         return self.parsed_json
 
+    @property
+    def accept(self) -> AcceptContainer:
+        if self.parsed_accept is None:
+            accept_header = self.headers.getone("accept", "")
+            self.parsed_accept = parse_accept(accept_header)
+        return self.parsed_accept
+
     @property
     def token(self):
         """Attempt to return the auth header token.
@@ -303,7 +314,7 @@ class Request:
         :return: token related to request
         """
         prefixes = ("Bearer", "Token")
-        auth_header = self.headers.get("Authorization")
+        auth_header = self.headers.getone("authorization", None)
 
         if auth_header is not None:
             for prefix in prefixes:
@@ -317,8 +328,8 @@ class Request:
         if self.parsed_form is None:
             self.parsed_form = RequestParameters()
             self.parsed_files = RequestParameters()
-            content_type = self.headers.get(
-                "Content-Type", DEFAULT_HTTP_CONTENT_TYPE
+            content_type = self.headers.getone(
+                "content-type", DEFAULT_HTTP_CONTENT_TYPE
             )
             content_type, parameters = parse_content_header(content_type)
             try:
@@ -378,9 +389,12 @@ class Request:
         :type errors: str
         :return: RequestParameters
         """
-        if not self.parsed_args[
-            (keep_blank_values, strict_parsing, encoding, errors)
-        ]:
+        if (
+            keep_blank_values,
+            strict_parsing,
+            encoding,
+            errors,
+        ) not in self.parsed_args:
             if self.query_string:
                 self.parsed_args[
                     (keep_blank_values, strict_parsing, encoding, errors)
@@ -434,9 +448,12 @@ class Request:
         :type errors: str
         :return: list
         """
-        if not self.parsed_not_grouped_args[
-            (keep_blank_values, strict_parsing, encoding, errors)
-        ]:
+        if (
+            keep_blank_values,
+            strict_parsing,
+            encoding,
+            errors,
+        ) not in self.parsed_not_grouped_args:
             if self.query_string:
                 self.parsed_not_grouped_args[
                     (keep_blank_values, strict_parsing, encoding, errors)
@@ -465,7 +482,7 @@ class Request:
         """
 
         if self._cookies is None:
-            cookie = self.headers.get("Cookie")
+            cookie = self.headers.getone("cookie", None)
             if cookie is not None:
                 cookies: SimpleCookie = SimpleCookie()
                 cookies.load(cookie)
@@ -482,7 +499,7 @@ class Request:
         :return: Content-Type header form the request
         :rtype: str
         """
-        return self.headers.get("Content-Type", DEFAULT_HTTP_CONTENT_TYPE)
+        return self.headers.getone("content-type", DEFAULT_HTTP_CONTENT_TYPE)
 
     @property
     def match_info(self):
@@ -491,6 +508,10 @@ class Request:
         """
         return self._match_info
 
+    @match_info.setter
+    def match_info(self, value):
+        self._match_info = value
+
     # Transport properties (obtained from local interface only)
 
     @property
@@ -499,7 +520,7 @@ class Request:
         :return: peer ip of the socket
         :rtype: str
         """
-        return self.conn_info.client if self.conn_info else ""
+        return self.conn_info.client_ip if self.conn_info else ""
 
     @property
     def port(self) -> int:
@@ -581,7 +602,7 @@ class Request:
 
         if (
             self.app.websocket_enabled
-            and self.headers.get("upgrade") == "websocket"
+            and self.headers.getone("upgrade", "").lower() == "websocket"
         ):
             scheme = "ws"
         else:
@@ -608,7 +629,9 @@ class Request:
         server_name = self.app.config.get("SERVER_NAME")
         if server_name:
             return server_name.split("//", 1)[-1].split("/", 1)[0]
-        return str(self.forwarded.get("host") or self.headers.get("host", ""))
+        return str(
+            self.forwarded.get("host") or self.headers.getone("host", "")
+        )
 
     @property
     def server_name(self) -> str:

sanic/response.py

@@ -143,7 +143,7 @@ class StreamingHTTPResponse(BaseHTTPResponse):
 
     .. warning::
 
-        **Deprecated** and set for removal in v21.6. You can now achieve the
+        **Deprecated** and set for removal in v21.12. You can now achieve the
         same functionality without a callback.
 
         .. code-block:: python
@@ -174,12 +174,16 @@ class StreamingHTTPResponse(BaseHTTPResponse):
         status: int = 200,
         headers: Optional[Union[Header, Dict[str, str]]] = None,
         content_type: str = "text/plain; charset=utf-8",
-        chunked="deprecated",
+        ignore_deprecation_notice: bool = False,
     ):
-        if chunked != "deprecated":
+        if not ignore_deprecation_notice:
             warn(
-                "The chunked argument has been deprecated and will be "
-                "removed in v21.6"
+                "Use of the StreamingHTTPResponse is deprecated in v21.6, and "
+                "will be removed in v21.12. Please upgrade your streaming "
+                "response implementation. You can learn more here: "
+                "https://sanicframework.org/en/guide/advanced/streaming.html"
+                "#response-streaming. If you use the builtin stream() or "
+                "file_stream() methods, this upgrade will be be done for you."
             )
 
         super().__init__()
@@ -203,6 +207,9 @@ class StreamingHTTPResponse(BaseHTTPResponse):
             self.streaming_fn = None
         await super().send(*args, **kwargs)
 
+    async def eof(self):
+        raise NotImplementedError
+
 
 class HTTPResponse(BaseHTTPResponse):
     """
@@ -235,6 +242,15 @@ class HTTPResponse(BaseHTTPResponse):
         self.headers = Header(headers or {})
         self._cookies = None
 
+    async def eof(self):
+        await self.send("", True)
+
+    async def __aenter__(self):
+        return self.send
+
+    async def __aexit__(self, *_):
+        await self.eof()
+
 
 def empty(
     status=204, headers: Optional[Dict[str, str]] = None
@@ -396,7 +412,6 @@ async def file_stream(
     mime_type: Optional[str] = None,
     headers: Optional[Dict[str, str]] = None,
     filename: Optional[str] = None,
-    chunked="deprecated",
     _range: Optional[Range] = None,
 ) -> StreamingHTTPResponse:
     """Return a streaming response object with file data.
@@ -409,12 +424,6 @@ async def file_stream(
     :param chunked: Deprecated
     :param _range:
     """
-    if chunked != "deprecated":
-        warn(
-            "The chunked argument has been deprecated and will be "
-            "removed in v21.6"
-        )
-
     headers = headers or {}
     if filename:
         headers.setdefault(
@@ -453,6 +462,7 @@ async def file_stream(
         status=status,
         headers=headers,
         content_type=mime_type,
+        ignore_deprecation_notice=True,
     )
 
 
@@ -461,7 +471,6 @@ def stream(
     status: int = 200,
     headers: Optional[Dict[str, str]] = None,
     content_type: str = "text/plain; charset=utf-8",
-    chunked="deprecated",
 ):
     """Accepts an coroutine `streaming_fn` which can be used to
     write chunks to a streaming response. Returns a `StreamingHTTPResponse`.
@@ -482,17 +491,12 @@ def stream(
     :param headers: Custom Headers.
     :param chunked: Deprecated
     """
-    if chunked != "deprecated":
-        warn(
-            "The chunked argument has been deprecated and will be "
-            "removed in v21.6"
-        )
-
     return StreamingHTTPResponse(
         streaming_fn,
         headers=headers,
         content_type=content_type,
         status=status,
+        ignore_deprecation_notice=True,
     )
 
 

sanic/router.py

@@ -1,5 +1,9 @@
+from __future__ import annotations
+
 from functools import lru_cache
+from inspect import signature
 from typing import Any, Dict, Iterable, List, Optional, Tuple, Union
+from uuid import UUID
 
 from sanic_routing import BaseRouter  # type: ignore
 from sanic_routing.exceptions import NoMethod  # type: ignore
@@ -9,6 +13,7 @@ from sanic_routing.exceptions import (
 from sanic_routing.route import Route  # type: ignore
 
 from sanic.constants import HTTP_METHODS
+from sanic.errorpages import check_error_format
 from sanic.exceptions import MethodNotSupported, NotFound, SanicException
 from sanic.models.handler_types import RouteHandler
 
@@ -33,7 +38,7 @@ class Router(BaseRouter):
             return self.resolve(
                 path=path,
                 method=method,
-                extra={"host": host},
+                extra={"host": host} if host else None,
             )
         except RoutingNotFound as e:
             raise NotFound("Requested URL {} not found".format(e.path))
@@ -73,6 +78,8 @@ class Router(BaseRouter):
         name: Optional[str] = None,
         unquote: bool = False,
         static: bool = False,
+        version_prefix: str = "/v",
+        error_format: Optional[str] = None,
     ) -> Union[Route, List[Route]]:
         """
         Add a handler to the router
@@ -103,12 +110,14 @@ class Router(BaseRouter):
         """
         if version is not None:
             version = str(version).strip("/").lstrip("v")
-            uri = "/".join([f"/v{version}", uri.lstrip("/")])
+            uri = "/".join([f"{version_prefix}{version}", uri.lstrip("/")])
+
+        uri = self._normalize(uri, handler)
 
         params = dict(
             path=uri,
             handler=handler,
-            methods=methods,
+            methods=frozenset(map(str, methods)) if methods else None,
             name=name,
             strict=strict_slashes,
             unquote=unquote,
@@ -130,6 +139,11 @@ class Router(BaseRouter):
             route.ctx.stream = stream
             route.ctx.hosts = hosts
             route.ctx.static = static
+            route.ctx.error_format = (
+                error_format or self.ctx.app.config.FALLBACK_ERROR_FORMAT
+            )
+
+            check_error_format(route.ctx.error_format)
 
             routes.append(route)
 
@@ -161,7 +175,7 @@ class Router(BaseRouter):
 
     @property
     def routes_all(self):
-        return self.routes
+        return {route.parts: route for route in self.routes}
 
     @property
     def routes_static(self):
@@ -186,3 +200,24 @@ class Router(BaseRouter):
                 raise SanicException(
                     f"Invalid route: {route}. Parameter names cannot use '__'."
                 )
+
+    def _normalize(self, uri: str, handler: RouteHandler) -> str:
+        if "<" not in uri:
+            return uri
+
+        sig = signature(handler)
+        mapping = {
+            param.name: param.annotation.__name__.lower()
+            for param in sig.parameters.values()
+            if param.annotation in (str, int, float, UUID)
+        }
+
+        reconstruction = []
+        for part in uri.split("/"):
+            if part.startswith("<") and ":" not in part:
+                name = part[1:-1]
+                annotation = mapping.get(name)
+                if annotation:
+                    part = f"<{name}:{annotation}>"
+            reconstruction.append(part)
+        return "/".join(reconstruction)

sanic/server.py

@@ -1,794 +0,0 @@
-from __future__ import annotations
-
-from ssl import SSLContext
-from types import SimpleNamespace
-from typing import (
-    TYPE_CHECKING,
-    Any,
-    Callable,
-    Dict,
-    Iterable,
-    Optional,
-    Type,
-    Union,
-)
-
-from sanic.models.handler_types import ListenerType
-
-
-if TYPE_CHECKING:
-    from sanic.app import Sanic
-
-import asyncio
-import multiprocessing
-import os
-import secrets
-import socket
-import stat
-
-from asyncio import CancelledError
-from asyncio.transports import Transport
-from functools import partial
-from inspect import isawaitable
-from ipaddress import ip_address
-from signal import SIG_IGN, SIGINT, SIGTERM, Signals
-from signal import signal as signal_func
-from time import monotonic as current_time
-
-from sanic.compat import OS_IS_WINDOWS, ctrlc_workaround_for_windows
-from sanic.config import Config
-from sanic.exceptions import RequestTimeout, ServiceUnavailable
-from sanic.http import Http, Stage
-from sanic.log import logger
-from sanic.models.protocol_types import TransportProtocol
-from sanic.request import Request
-
-
-try:
-    import uvloop  # type: ignore
-
-    if not isinstance(asyncio.get_event_loop_policy(), uvloop.EventLoopPolicy):
-        asyncio.set_event_loop_policy(uvloop.EventLoopPolicy())
-except ImportError:
-    pass
-
-
-class Signal:
-    stopped = False
-
-
-class ConnInfo:
-    """
-    Local and remote addresses and SSL status info.
-    """
-
-    __slots__ = (
-        "client_port",
-        "client",
-        "ctx",
-        "peername",
-        "server_port",
-        "server",
-        "sockname",
-        "ssl",
-    )
-
-    def __init__(self, transport: TransportProtocol, unix=None):
-        self.ctx = SimpleNamespace()
-        self.peername = None
-        self.server = self.client = ""
-        self.server_port = self.client_port = 0
-        self.sockname = addr = transport.get_extra_info("sockname")
-        self.ssl: bool = bool(transport.get_extra_info("sslcontext"))
-
-        if isinstance(addr, str):  # UNIX socket
-            self.server = unix or addr
-            return
-
-        # IPv4 (ip, port) or IPv6 (ip, port, flowinfo, scopeid)
-        if isinstance(addr, tuple):
-            self.server = addr[0] if len(addr) == 2 else f"[{addr[0]}]"
-            self.server_port = addr[1]
-            # self.server gets non-standard port appended
-            if addr[1] != (443 if self.ssl else 80):
-                self.server = f"{self.server}:{addr[1]}"
-        self.peername = addr = transport.get_extra_info("peername")
-
-        if isinstance(addr, tuple):
-            self.client = addr[0] if len(addr) == 2 else f"[{addr[0]}]"
-            self.client_port = addr[1]
-
-
-class HttpProtocol(asyncio.Protocol):
-    """
-    This class provides a basic HTTP implementation of the sanic framework.
-    """
-
-    __slots__ = (
-        # app
-        "app",
-        # event loop, connection
-        "loop",
-        "transport",
-        "connections",
-        "signal",
-        "conn_info",
-        "ctx",
-        # request params
-        "request",
-        # request config
-        "request_handler",
-        "request_timeout",
-        "response_timeout",
-        "keep_alive_timeout",
-        "request_max_size",
-        "request_buffer_queue_size",
-        "request_class",
-        "error_handler",
-        # enable or disable access log purpose
-        "access_log",
-        # connection management
-        "state",
-        "url",
-        "_handler_task",
-        "_can_write",
-        "_data_received",
-        "_time",
-        "_task",
-        "_http",
-        "_exception",
-        "recv_buffer",
-        "_unix",
-    )
-
-    def __init__(
-        self,
-        *,
-        loop,
-        app: Sanic,
-        signal=None,
-        connections=None,
-        state=None,
-        unix=None,
-        **kwargs,
-    ):
-        asyncio.set_event_loop(loop)
-        self.loop = loop
-        self.app: Sanic = app
-        self.url = None
-        self.transport: Optional[Transport] = None
-        self.conn_info: Optional[ConnInfo] = None
-        self.request: Optional[Request] = None
-        self.signal = signal or Signal()
-        self.access_log = self.app.config.ACCESS_LOG
-        self.connections = connections if connections is not None else set()
-        self.request_handler = self.app.handle_request
-        self.error_handler = self.app.error_handler
-        self.request_timeout = self.app.config.REQUEST_TIMEOUT
-        self.request_buffer_queue_size = (
-            self.app.config.REQUEST_BUFFER_QUEUE_SIZE
-        )
-        self.response_timeout = self.app.config.RESPONSE_TIMEOUT
-        self.keep_alive_timeout = self.app.config.KEEP_ALIVE_TIMEOUT
-        self.request_max_size = self.app.config.REQUEST_MAX_SIZE
-        self.request_class = self.app.request_class or Request
-        self.state = state if state else {}
-        if "requests_count" not in self.state:
-            self.state["requests_count"] = 0
-        self._data_received = asyncio.Event()
-        self._can_write = asyncio.Event()
-        self._can_write.set()
-        self._exception = None
-        self._unix = unix
-
-    def _setup_connection(self):
-        self._http = Http(self)
-        self._time = current_time()
-        self.check_timeouts()
-
-    async def connection_task(self):
-        """
-        Run a HTTP connection.
-
-        Timeouts and some additional error handling occur here, while most of
-        everything else happens in class Http or in code called from there.
-        """
-        try:
-            self._setup_connection()
-            await self._http.http1()
-        except CancelledError:
-            pass
-        except Exception:
-            logger.exception("protocol.connection_task uncaught")
-        finally:
-            if self.app.debug and self._http:
-                ip = self.transport.get_extra_info("peername")
-                logger.error(
-                    "Connection lost before response written"
-                    f" @ {ip} {self._http.request}"
-                )
-            self._http = None
-            self._task = None
-            try:
-                self.close()
-            except BaseException:
-                logger.exception("Closing failed")
-
-    async def receive_more(self):
-        """
-        Wait until more data is received into the Server protocol's buffer
-        """
-        self.transport.resume_reading()
-        self._data_received.clear()
-        await self._data_received.wait()
-
-    def check_timeouts(self):
-        """
-        Runs itself periodically to enforce any expired timeouts.
-        """
-        try:
-            if not self._task:
-                return
-            duration = current_time() - self._time
-            stage = self._http.stage
-            if stage is Stage.IDLE and duration > self.keep_alive_timeout:
-                logger.debug("KeepAlive Timeout. Closing connection.")
-            elif stage is Stage.REQUEST and duration > self.request_timeout:
-                logger.debug("Request Timeout. Closing connection.")
-                self._http.exception = RequestTimeout("Request Timeout")
-            elif stage is Stage.HANDLER and self._http.upgrade_websocket:
-                logger.debug("Handling websocket. Timeouts disabled.")
-                return
-            elif (
-                stage in (Stage.HANDLER, Stage.RESPONSE, Stage.FAILED)
-                and duration > self.response_timeout
-            ):
-                logger.debug("Response Timeout. Closing connection.")
-                self._http.exception = ServiceUnavailable("Response Timeout")
-            else:
-                interval = (
-                    min(
-                        self.keep_alive_timeout,
-                        self.request_timeout,
-                        self.response_timeout,
-                    )
-                    / 2
-                )
-                self.loop.call_later(max(0.1, interval), self.check_timeouts)
-                return
-            self._task.cancel()
-        except Exception:
-            logger.exception("protocol.check_timeouts")
-
-    async def send(self, data):
-        """
-        Writes data with backpressure control.
-        """
-        await self._can_write.wait()
-        if self.transport.is_closing():
-            raise CancelledError
-        self.transport.write(data)
-        self._time = current_time()
-
-    def close_if_idle(self) -> bool:
-        """
-        Close the connection if a request is not being sent or received
-
-        :return: boolean - True if closed, false if staying open
-        """
-        if self._http is None or self._http.stage is Stage.IDLE:
-            self.close()
-            return True
-        return False
-
-    def close(self):
-        """
-        Force close the connection.
-        """
-        # Cause a call to connection_lost where further cleanup occurs
-        if self.transport:
-            self.transport.close()
-            self.transport = None
-
-    # -------------------------------------------- #
-    # Only asyncio.Protocol callbacks below this
-    # -------------------------------------------- #
-
-    def connection_made(self, transport):
-        try:
-            # TODO: Benchmark to find suitable write buffer limits
-            transport.set_write_buffer_limits(low=16384, high=65536)
-            self.connections.add(self)
-            self.transport = transport
-            self._task = self.loop.create_task(self.connection_task())
-            self.recv_buffer = bytearray()
-            self.conn_info = ConnInfo(self.transport, unix=self._unix)
-        except Exception:
-            logger.exception("protocol.connect_made")
-
-    def connection_lost(self, exc):
-        try:
-            self.connections.discard(self)
-            self.resume_writing()
-            if self._task:
-                self._task.cancel()
-        except Exception:
-            logger.exception("protocol.connection_lost")
-
-    def pause_writing(self):
-        self._can_write.clear()
-
-    def resume_writing(self):
-        self._can_write.set()
-
-    def data_received(self, data: bytes):
-        try:
-            self._time = current_time()
-            if not data:
-                return self.close()
-            self.recv_buffer += data
-
-            if (
-                len(self.recv_buffer) > self.app.config.REQUEST_BUFFER_SIZE
-                and self.transport
-            ):
-                self.transport.pause_reading()
-
-            if self._data_received:
-                self._data_received.set()
-        except Exception:
-            logger.exception("protocol.data_received")
-
-
-def trigger_events(events: Optional[Iterable[Callable[..., Any]]], loop):
-    """
-    Trigger event callbacks (functions or async)
-
-    :param events: one or more sync or async functions to execute
-    :param loop: event loop
-    """
-    if events:
-        for event in events:
-            result = event(loop)
-            if isawaitable(result):
-                loop.run_until_complete(result)
-
-
-class AsyncioServer:
-    """
-    Wraps an asyncio server with functionality that might be useful to
-    a user who needs to manage the server lifecycle manually.
-    """
-
-    __slots__ = (
-        "loop",
-        "serve_coro",
-        "_after_start",
-        "_before_stop",
-        "_after_stop",
-        "server",
-        "connections",
-    )
-
-    def __init__(
-        self,
-        loop,
-        serve_coro,
-        connections,
-        after_start: Optional[Iterable[ListenerType]],
-        before_stop: Optional[Iterable[ListenerType]],
-        after_stop: Optional[Iterable[ListenerType]],
-    ):
-        # Note, Sanic already called "before_server_start" events
-        # before this helper was even created. So we don't need it here.
-        self.loop = loop
-        self.serve_coro = serve_coro
-        self._after_start = after_start
-        self._before_stop = before_stop
-        self._after_stop = after_stop
-        self.server = None
-        self.connections = connections
-
-    def after_start(self):
-        """
-        Trigger "after_server_start" events
-        """
-        trigger_events(self._after_start, self.loop)
-
-    def before_stop(self):
-        """
-        Trigger "before_server_stop" events
-        """
-        trigger_events(self._before_stop, self.loop)
-
-    def after_stop(self):
-        """
-        Trigger "after_server_stop" events
-        """
-        trigger_events(self._after_stop, self.loop)
-
-    def is_serving(self) -> bool:
-        if self.server:
-            return self.server.is_serving()
-        return False
-
-    def wait_closed(self):
-        if self.server:
-            return self.server.wait_closed()
-
-    def close(self):
-        if self.server:
-            self.server.close()
-            coro = self.wait_closed()
-            task = asyncio.ensure_future(coro, loop=self.loop)
-            return task
-
-    def start_serving(self):
-        if self.server:
-            try:
-                return self.server.start_serving()
-            except AttributeError:
-                raise NotImplementedError(
-                    "server.start_serving not available in this version "
-                    "of asyncio or uvloop."
-                )
-
-    def serve_forever(self):
-        if self.server:
-            try:
-                return self.server.serve_forever()
-            except AttributeError:
-                raise NotImplementedError(
-                    "server.serve_forever not available in this version "
-                    "of asyncio or uvloop."
-                )
-
-    def __await__(self):
-        """
-        Starts the asyncio server, returns AsyncServerCoro
-        """
-        task = asyncio.ensure_future(self.serve_coro)
-        while not task.done():
-            yield
-        self.server = task.result()
-        return self
-
-
-def serve(
-    host,
-    port,
-    app,
-    before_start: Optional[Iterable[ListenerType]] = None,
-    after_start: Optional[Iterable[ListenerType]] = None,
-    before_stop: Optional[Iterable[ListenerType]] = None,
-    after_stop: Optional[Iterable[ListenerType]] = None,
-    ssl: Optional[SSLContext] = None,
-    sock: Optional[socket.socket] = None,
-    unix: Optional[str] = None,
-    reuse_port: bool = False,
-    loop=None,
-    protocol: Type[asyncio.Protocol] = HttpProtocol,
-    backlog: int = 100,
-    register_sys_signals: bool = True,
-    run_multiple: bool = False,
-    run_async: bool = False,
-    connections=None,
-    signal=Signal(),
-    state=None,
-    asyncio_server_kwargs=None,
-):
-    """Start asynchronous HTTP Server on an individual process.
-
-    :param host: Address to host on
-    :param port: Port to host on
-    :param before_start: function to be executed before the server starts
-                         listening. Takes arguments `app` instance and `loop`
-    :param after_start: function to be executed after the server starts
-                        listening. Takes  arguments `app` instance and `loop`
-    :param before_stop: function to be executed when a stop signal is
-                        received before it is respected. Takes arguments
-                        `app` instance and `loop`
-    :param after_stop: function to be executed when a stop signal is
-                       received after it is respected. Takes arguments
-                       `app` instance and `loop`
-    :param ssl: SSLContext
-    :param sock: Socket for the server to accept connections from
-    :param unix: Unix socket to listen on instead of TCP port
-    :param reuse_port: `True` for multiple workers
-    :param loop: asyncio compatible event loop
-    :param run_async: bool: Do not create a new event loop for the server,
-                      and return an AsyncServer object rather than running it
-    :param asyncio_server_kwargs: key-value args for asyncio/uvloop
-                                  create_server method
-    :return: Nothing
-    """
-    if not run_async and not loop:
-        # create new event_loop after fork
-        loop = asyncio.new_event_loop()
-        asyncio.set_event_loop(loop)
-
-    if app.debug:
-        loop.set_debug(app.debug)
-
-    app.asgi = False
-
-    connections = connections if connections is not None else set()
-    protocol_kwargs = _build_protocol_kwargs(protocol, app.config)
-    server = partial(
-        protocol,
-        loop=loop,
-        connections=connections,
-        signal=signal,
-        app=app,
-        state=state,
-        unix=unix,
-        **protocol_kwargs,
-    )
-    asyncio_server_kwargs = (
-        asyncio_server_kwargs if asyncio_server_kwargs else {}
-    )
-    # UNIX sockets are always bound by us (to preserve semantics between modes)
-    if unix:
-        sock = bind_unix_socket(unix, backlog=backlog)
-    server_coroutine = loop.create_server(
-        server,
-        None if sock else host,
-        None if sock else port,
-        ssl=ssl,
-        reuse_port=reuse_port,
-        sock=sock,
-        backlog=backlog,
-        **asyncio_server_kwargs,
-    )
-
-    if run_async:
-        return AsyncioServer(
-            loop=loop,
-            serve_coro=server_coroutine,
-            connections=connections,
-            after_start=after_start,
-            before_stop=before_stop,
-            after_stop=after_stop,
-        )
-
-    trigger_events(before_start, loop)
-
-    try:
-        http_server = loop.run_until_complete(server_coroutine)
-    except BaseException:
-        logger.exception("Unable to start server")
-        return
-
-    trigger_events(after_start, loop)
-
-    # Ignore SIGINT when run_multiple
-    if run_multiple:
-        signal_func(SIGINT, SIG_IGN)
-
-    # Register signals for graceful termination
-    if register_sys_signals:
-        if OS_IS_WINDOWS:
-            ctrlc_workaround_for_windows(app)
-        else:
-            for _signal in [SIGTERM] if run_multiple else [SIGINT, SIGTERM]:
-                loop.add_signal_handler(_signal, app.stop)
-    pid = os.getpid()
-    try:
-        logger.info("Starting worker [%s]", pid)
-        loop.run_forever()
-    finally:
-        logger.info("Stopping worker [%s]", pid)
-
-        # Run the on_stop function if provided
-        trigger_events(before_stop, loop)
-
-        # Wait for event loop to finish and all connections to drain
-        http_server.close()
-        loop.run_until_complete(http_server.wait_closed())
-
-        # Complete all tasks on the loop
-        signal.stopped = True
-        for connection in connections:
-            connection.close_if_idle()
-
-        # Gracefully shutdown timeout.
-        # We should provide graceful_shutdown_timeout,
-        # instead of letting connection hangs forever.
-        # Let's roughly calcucate time.
-        graceful = app.config.GRACEFUL_SHUTDOWN_TIMEOUT
-        start_shutdown: float = 0
-        while connections and (start_shutdown < graceful):
-            loop.run_until_complete(asyncio.sleep(0.1))
-            start_shutdown = start_shutdown + 0.1
-
-        # Force close non-idle connection after waiting for
-        # graceful_shutdown_timeout
-        coros = []
-        for conn in connections:
-            if hasattr(conn, "websocket") and conn.websocket:
-                coros.append(conn.websocket.close_connection())
-            else:
-                conn.close()
-
-        _shutdown = asyncio.gather(*coros)
-        loop.run_until_complete(_shutdown)
-
-        trigger_events(after_stop, loop)
-
-        remove_unix_socket(unix)
-
-
-def _build_protocol_kwargs(
-    protocol: Type[asyncio.Protocol], config: Config
-) -> Dict[str, Union[int, float]]:
-    if hasattr(protocol, "websocket_handshake"):
-        return {
-            "websocket_max_size": config.WEBSOCKET_MAX_SIZE,
-            "websocket_max_queue": config.WEBSOCKET_MAX_QUEUE,
-            "websocket_read_limit": config.WEBSOCKET_READ_LIMIT,
-            "websocket_write_limit": config.WEBSOCKET_WRITE_LIMIT,
-            "websocket_ping_timeout": config.WEBSOCKET_PING_TIMEOUT,
-            "websocket_ping_interval": config.WEBSOCKET_PING_INTERVAL,
-        }
-    return {}
-
-
-def bind_socket(host: str, port: int, *, backlog=100) -> socket.socket:
-    """Create TCP server socket.
-    :param host: IPv4, IPv6 or hostname may be specified
-    :param port: TCP port number
-    :param backlog: Maximum number of connections to queue
-    :return: socket.socket object
-    """
-    try:  # IP address: family must be specified for IPv6 at least
-        ip = ip_address(host)
-        host = str(ip)
-        sock = socket.socket(
-            socket.AF_INET6 if ip.version == 6 else socket.AF_INET
-        )
-    except ValueError:  # Hostname, may become AF_INET or AF_INET6
-        sock = socket.socket()
-    sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
-    sock.bind((host, port))
-    sock.listen(backlog)
-    return sock
-
-
-def bind_unix_socket(path: str, *, mode=0o666, backlog=100) -> socket.socket:
-    """Create unix socket.
-    :param path: filesystem path
-    :param backlog: Maximum number of connections to queue
-    :return: socket.socket object
-    """
-    """Open or atomically replace existing socket with zero downtime."""
-    # Sanitise and pre-verify socket path
-    path = os.path.abspath(path)
-    folder = os.path.dirname(path)
-    if not os.path.isdir(folder):
-        raise FileNotFoundError(f"Socket folder does not exist: {folder}")
-    try:
-        if not stat.S_ISSOCK(os.stat(path, follow_symlinks=False).st_mode):
-            raise FileExistsError(f"Existing file is not a socket: {path}")
-    except FileNotFoundError:
-        pass
-    # Create new socket with a random temporary name
-    tmp_path = f"{path}.{secrets.token_urlsafe()}"
-    sock = socket.socket(socket.AF_UNIX)
-    try:
-        # Critical section begins (filename races)
-        sock.bind(tmp_path)
-        try:
-            os.chmod(tmp_path, mode)
-            # Start listening before rename to avoid connection failures
-            sock.listen(backlog)
-            os.rename(tmp_path, path)
-        except:  # noqa: E722
-            try:
-                os.unlink(tmp_path)
-            finally:
-                raise
-    except:  # noqa: E722
-        try:
-            sock.close()
-        finally:
-            raise
-    return sock
-
-
-def remove_unix_socket(path: Optional[str]) -> None:
-    """Remove dead unix socket during server exit."""
-    if not path:
-        return
-    try:
-        if stat.S_ISSOCK(os.stat(path, follow_symlinks=False).st_mode):
-            # Is it actually dead (doesn't belong to a new server instance)?
-            with socket.socket(socket.AF_UNIX) as testsock:
-                try:
-                    testsock.connect(path)
-                except ConnectionRefusedError:
-                    os.unlink(path)
-    except FileNotFoundError:
-        pass
-
-
-def serve_single(server_settings):
-    main_start = server_settings.pop("main_start", None)
-    main_stop = server_settings.pop("main_stop", None)
-
-    if not server_settings.get("run_async"):
-        # create new event_loop after fork
-        loop = asyncio.new_event_loop()
-        asyncio.set_event_loop(loop)
-        server_settings["loop"] = loop
-
-    trigger_events(main_start, server_settings["loop"])
-    serve(**server_settings)
-    trigger_events(main_stop, server_settings["loop"])
-
-    server_settings["loop"].close()
-
-
-def serve_multiple(server_settings, workers):
-    """Start multiple server processes simultaneously.  Stop on interrupt
-    and terminate signals, and drain connections when complete.
-
-    :param server_settings: kw arguments to be passed to the serve function
-    :param workers: number of workers to launch
-    :param stop_event: if provided, is used as a stop signal
-    :return:
-    """
-    server_settings["reuse_port"] = True
-    server_settings["run_multiple"] = True
-
-    main_start = server_settings.pop("main_start", None)
-    main_stop = server_settings.pop("main_stop", None)
-    loop = asyncio.new_event_loop()
-    asyncio.set_event_loop(loop)
-
-    trigger_events(main_start, loop)
-
-    # Create a listening socket or use the one in settings
-    sock = server_settings.get("sock")
-    unix = server_settings["unix"]
-    backlog = server_settings["backlog"]
-    if unix:
-        sock = bind_unix_socket(unix, backlog=backlog)
-        server_settings["unix"] = unix
-    if sock is None:
-        sock = bind_socket(
-            server_settings["host"], server_settings["port"], backlog=backlog
-        )
-        sock.set_inheritable(True)
-        server_settings["sock"] = sock
-        server_settings["host"] = None
-        server_settings["port"] = None
-
-    processes = []
-
-    def sig_handler(signal, frame):
-        logger.info("Received signal %s. Shutting down.", Signals(signal).name)
-        for process in processes:
-            os.kill(process.pid, SIGTERM)
-
-    signal_func(SIGINT, lambda s, f: sig_handler(s, f))
-    signal_func(SIGTERM, lambda s, f: sig_handler(s, f))
-    mp = multiprocessing.get_context("fork")
-
-    for _ in range(workers):
-        process = mp.Process(target=serve, kwargs=server_settings)
-        process.daemon = True
-        process.start()
-        processes.append(process)
-
-    for process in processes:
-        process.join()
-
-    # the above processes will block this until they're stopped
-    for process in processes:
-        process.terminate()
-
-    trigger_events(main_stop, loop)
-
-    sock.close()
-    loop.close()
-    remove_unix_socket(unix)

sanic/server/__init__.py

@@ -0,0 +1,26 @@
+import asyncio
+
+from sanic.models.server_types import ConnInfo, Signal
+from sanic.server.async_server import AsyncioServer
+from sanic.server.protocols.http_protocol import HttpProtocol
+from sanic.server.runners import serve, serve_multiple, serve_single
+
+
+try:
+    import uvloop  # type: ignore
+
+    if not isinstance(asyncio.get_event_loop_policy(), uvloop.EventLoopPolicy):
+        asyncio.set_event_loop_policy(uvloop.EventLoopPolicy())
+except ImportError:
+    pass
+
+
+__all__ = (
+    "AsyncioServer",
+    "ConnInfo",
+    "HttpProtocol",
+    "Signal",
+    "serve",
+    "serve_multiple",
+    "serve_single",
+)

sanic/server/async_server.py

@@ -0,0 +1,115 @@
+from __future__ import annotations
+
+import asyncio
+
+from sanic.exceptions import SanicException
+
+
+class AsyncioServer:
+    """
+    Wraps an asyncio server with functionality that might be useful to
+    a user who needs to manage the server lifecycle manually.
+    """
+
+    __slots__ = ("app", "connections", "loop", "serve_coro", "server", "init")
+
+    def __init__(
+        self,
+        app,
+        loop,
+        serve_coro,
+        connections,
+    ):
+        # Note, Sanic already called "before_server_start" events
+        # before this helper was even created. So we don't need it here.
+        self.app = app
+        self.connections = connections
+        self.loop = loop
+        self.serve_coro = serve_coro
+        self.server = None
+        self.init = False
+
+    def startup(self):
+        """
+        Trigger "before_server_start" events
+        """
+        self.init = True
+        return self.app._startup()
+
+    def before_start(self):
+        """
+        Trigger "before_server_start" events
+        """
+        return self._server_event("init", "before")
+
+    def after_start(self):
+        """
+        Trigger "after_server_start" events
+        """
+        return self._server_event("init", "after")
+
+    def before_stop(self):
+        """
+        Trigger "before_server_stop" events
+        """
+        return self._server_event("shutdown", "before")
+
+    def after_stop(self):
+        """
+        Trigger "after_server_stop" events
+        """
+        return self._server_event("shutdown", "after")
+
+    def is_serving(self) -> bool:
+        if self.server:
+            return self.server.is_serving()
+        return False
+
+    def wait_closed(self):
+        if self.server:
+            return self.server.wait_closed()
+
+    def close(self):
+        if self.server:
+            self.server.close()
+            coro = self.wait_closed()
+            task = asyncio.ensure_future(coro, loop=self.loop)
+            return task
+
+    def start_serving(self):
+        if self.server:
+            try:
+                return self.server.start_serving()
+            except AttributeError:
+                raise NotImplementedError(
+                    "server.start_serving not available in this version "
+                    "of asyncio or uvloop."
+                )
+
+    def serve_forever(self):
+        if self.server:
+            try:
+                return self.server.serve_forever()
+            except AttributeError:
+                raise NotImplementedError(
+                    "server.serve_forever not available in this version "
+                    "of asyncio or uvloop."
+                )
+
+    def _server_event(self, concern: str, action: str):
+        if not self.init:
+            raise SanicException(
+                "Cannot dispatch server event without "
+                "first running server.startup()"
+            )
+        return self.app._server_event(concern, action, loop=self.loop)
+
+    def __await__(self):
+        """
+        Starts the asyncio server, returns AsyncServerCoro
+        """
+        task = asyncio.ensure_future(self.serve_coro)
+        while not task.done():
+            yield
+        self.server = task.result()
+        return self

sanic/server/events.py

@@ -0,0 +1,16 @@
+from inspect import isawaitable
+from typing import Any, Callable, Iterable, Optional
+
+
+def trigger_events(events: Optional[Iterable[Callable[..., Any]]], loop):
+    """
+    Trigger event callbacks (functions or async)
+
+    :param events: one or more sync or async functions to execute
+    :param loop: event loop
+    """
+    if events:
+        for event in events:
+            result = event(loop)
+            if isawaitable(result):
+                loop.run_until_complete(result)

sanic/server/protocols/base_protocol.py

@@ -0,0 +1,143 @@
+from __future__ import annotations
+
+from typing import TYPE_CHECKING, Optional
+
+
+if TYPE_CHECKING:
+    from sanic.app import Sanic
+
+import asyncio
+
+from asyncio import CancelledError
+from asyncio.transports import Transport
+from time import monotonic as current_time
+
+from sanic.log import error_logger
+from sanic.models.server_types import ConnInfo, Signal
+
+
+class SanicProtocol(asyncio.Protocol):
+    __slots__ = (
+        "app",
+        # event loop, connection
+        "loop",
+        "transport",
+        "connections",
+        "conn_info",
+        "signal",
+        "_can_write",
+        "_time",
+        "_task",
+        "_unix",
+        "_data_received",
+    )
+
+    def __init__(
+        self,
+        *,
+        loop,
+        app: Sanic,
+        signal=None,
+        connections=None,
+        unix=None,
+        **kwargs,
+    ):
+        asyncio.set_event_loop(loop)
+        self.loop = loop
+        self.app: Sanic = app
+        self.signal = signal or Signal()
+        self.transport: Optional[Transport] = None
+        self.connections = connections if connections is not None else set()
+        self.conn_info: Optional[ConnInfo] = None
+        self._can_write = asyncio.Event()
+        self._can_write.set()
+        self._unix = unix
+        self._time = 0.0  # type: float
+        self._task = None  # type: Optional[asyncio.Task]
+        self._data_received = asyncio.Event()
+
+    @property
+    def ctx(self):
+        if self.conn_info is not None:
+            return self.conn_info.ctx
+        else:
+            return None
+
+    async def send(self, data):
+        """
+        Generic data write implementation with backpressure control.
+        """
+        await self._can_write.wait()
+        if self.transport.is_closing():
+            raise CancelledError
+        self.transport.write(data)
+        self._time = current_time()
+
+    async def receive_more(self):
+        """
+        Wait until more data is received into the Server protocol's buffer
+        """
+        self.transport.resume_reading()
+        self._data_received.clear()
+        await self._data_received.wait()
+
+    def close(self, timeout: Optional[float] = None):
+        """
+        Attempt close the connection.
+        """
+        # Cause a call to connection_lost where further cleanup occurs
+        if self.transport:
+            self.transport.close()
+            if timeout is None:
+                timeout = self.app.config.GRACEFUL_SHUTDOWN_TIMEOUT
+            self.loop.call_later(timeout, self.abort)
+
+    def abort(self):
+        """
+        Force close the connection.
+        """
+        # Cause a call to connection_lost where further cleanup occurs
+        if self.transport:
+            self.transport.abort()
+            self.transport = None
+
+    # asyncio.Protocol API Callbacks #
+    # ------------------------------ #
+    def connection_made(self, transport):
+        """
+        Generic connection-made, with no connection_task, and no recv_buffer.
+        Override this for protocol-specific connection implementations.
+        """
+        try:
+            transport.set_write_buffer_limits(low=16384, high=65536)
+            self.connections.add(self)
+            self.transport = transport
+            self.conn_info = ConnInfo(self.transport, unix=self._unix)
+        except Exception:
+            error_logger.exception("protocol.connect_made")
+
+    def connection_lost(self, exc):
+        try:
+            self.connections.discard(self)
+            self.resume_writing()
+            if self._task:
+                self._task.cancel()
+        except BaseException:
+            error_logger.exception("protocol.connection_lost")
+
+    def pause_writing(self):
+        self._can_write.clear()
+
+    def resume_writing(self):
+        self._can_write.set()
+
+    def data_received(self, data: bytes):
+        try:
+            self._time = current_time()
+            if not data:
+                return self.close()
+
+            if self._data_received:
+                self._data_received.set()
+        except BaseException:
+            error_logger.exception("protocol.data_received")

sanic/server/protocols/http_protocol.py

@@ -0,0 +1,238 @@
+from __future__ import annotations
+
+from typing import TYPE_CHECKING, Optional
+
+from sanic.touchup.meta import TouchUpMeta
+
+
+if TYPE_CHECKING:
+    from sanic.app import Sanic
+
+from asyncio import CancelledError
+from time import monotonic as current_time
+
+from sanic.exceptions import RequestTimeout, ServiceUnavailable
+from sanic.http import Http, Stage
+from sanic.log import error_logger, logger
+from sanic.models.server_types import ConnInfo
+from sanic.request import Request
+from sanic.server.protocols.base_protocol import SanicProtocol
+
+
+class HttpProtocol(SanicProtocol, metaclass=TouchUpMeta):
+    """
+    This class provides implements the HTTP 1.1 protocol on top of our
+    Sanic Server transport
+    """
+
+    __touchup__ = (
+        "send",
+        "connection_task",
+    )
+    __slots__ = (
+        # request params
+        "request",
+        # request config
+        "request_handler",
+        "request_timeout",
+        "response_timeout",
+        "keep_alive_timeout",
+        "request_max_size",
+        "request_class",
+        "error_handler",
+        # enable or disable access log purpose
+        "access_log",
+        # connection management
+        "state",
+        "url",
+        "_handler_task",
+        "_http",
+        "_exception",
+        "recv_buffer",
+    )
+
+    def __init__(
+        self,
+        *,
+        loop,
+        app: Sanic,
+        signal=None,
+        connections=None,
+        state=None,
+        unix=None,
+        **kwargs,
+    ):
+        super().__init__(
+            loop=loop,
+            app=app,
+            signal=signal,
+            connections=connections,
+            unix=unix,
+        )
+        self.url = None
+        self.request: Optional[Request] = None
+        self.access_log = self.app.config.ACCESS_LOG
+        self.request_handler = self.app.handle_request
+        self.error_handler = self.app.error_handler
+        self.request_timeout = self.app.config.REQUEST_TIMEOUT
+        self.response_timeout = self.app.config.RESPONSE_TIMEOUT
+        self.keep_alive_timeout = self.app.config.KEEP_ALIVE_TIMEOUT
+        self.request_max_size = self.app.config.REQUEST_MAX_SIZE
+        self.request_class = self.app.request_class or Request
+        self.state = state if state else {}
+        if "requests_count" not in self.state:
+            self.state["requests_count"] = 0
+        self._exception = None
+
+    def _setup_connection(self):
+        self._http = Http(self)
+        self._time = current_time()
+        self.check_timeouts()
+
+    async def connection_task(self):  # no cov
+        """
+        Run a HTTP connection.
+
+        Timeouts and some additional error handling occur here, while most of
+        everything else happens in class Http or in code called from there.
+        """
+        try:
+            self._setup_connection()
+            await self.app.dispatch(
+                "http.lifecycle.begin",
+                inline=True,
+                context={"conn_info": self.conn_info},
+            )
+            await self._http.http1()
+        except CancelledError:
+            pass
+        except Exception:
+            error_logger.exception("protocol.connection_task uncaught")
+        finally:
+            if (
+                self.app.debug
+                and self._http
+                and self.transport
+                and not self._http.upgrade_websocket
+            ):
+                ip = self.transport.get_extra_info("peername")
+                error_logger.error(
+                    "Connection lost before response written"
+                    f" @ {ip} {self._http.request}"
+                )
+            self._http = None
+            self._task = None
+            try:
+                self.close()
+            except BaseException:
+                error_logger.exception("Closing failed")
+            finally:
+                await self.app.dispatch(
+                    "http.lifecycle.complete",
+                    inline=True,
+                    context={"conn_info": self.conn_info},
+                )
+                # Important to keep this Ellipsis here for the TouchUp module
+                ...
+
+    def check_timeouts(self):
+        """
+        Runs itself periodically to enforce any expired timeouts.
+        """
+        try:
+            if not self._task:
+                return
+            duration = current_time() - self._time
+            stage = self._http.stage
+            if stage is Stage.IDLE and duration > self.keep_alive_timeout:
+                logger.debug("KeepAlive Timeout. Closing connection.")
+            elif stage is Stage.REQUEST and duration > self.request_timeout:
+                logger.debug("Request Timeout. Closing connection.")
+                self._http.exception = RequestTimeout("Request Timeout")
+            elif stage is Stage.HANDLER and self._http.upgrade_websocket:
+                logger.debug("Handling websocket. Timeouts disabled.")
+                return
+            elif (
+                stage in (Stage.HANDLER, Stage.RESPONSE, Stage.FAILED)
+                and duration > self.response_timeout
+            ):
+                logger.debug("Response Timeout. Closing connection.")
+                self._http.exception = ServiceUnavailable("Response Timeout")
+            else:
+                interval = (
+                    min(
+                        self.keep_alive_timeout,
+                        self.request_timeout,
+                        self.response_timeout,
+                    )
+                    / 2
+                )
+                self.loop.call_later(max(0.1, interval), self.check_timeouts)
+                return
+            self._task.cancel()
+        except Exception:
+            error_logger.exception("protocol.check_timeouts")
+
+    async def send(self, data):  # no cov
+        """
+        Writes HTTP data with backpressure control.
+        """
+        await self._can_write.wait()
+        if self.transport.is_closing():
+            raise CancelledError
+        await self.app.dispatch(
+            "http.lifecycle.send",
+            inline=True,
+            context={"data": data},
+        )
+        self.transport.write(data)
+        self._time = current_time()
+
+    def close_if_idle(self) -> bool:
+        """
+        Close the connection if a request is not being sent or received
+
+        :return: boolean - True if closed, false if staying open
+        """
+        if self._http is None or self._http.stage is Stage.IDLE:
+            self.close()
+            return True
+        return False
+
+    # -------------------------------------------- #
+    # Only asyncio.Protocol callbacks below this
+    # -------------------------------------------- #
+
+    def connection_made(self, transport):
+        """
+        HTTP-protocol-specific new connection handler
+        """
+        try:
+            # TODO: Benchmark to find suitable write buffer limits
+            transport.set_write_buffer_limits(low=16384, high=65536)
+            self.connections.add(self)
+            self.transport = transport
+            self._task = self.loop.create_task(self.connection_task())
+            self.recv_buffer = bytearray()
+            self.conn_info = ConnInfo(self.transport, unix=self._unix)
+        except Exception:
+            error_logger.exception("protocol.connect_made")
+
+    def data_received(self, data: bytes):
+
+        try:
+            self._time = current_time()
+            if not data:
+                return self.close()
+            self.recv_buffer += data
+
+            if (
+                len(self.recv_buffer) >= self.app.config.REQUEST_BUFFER_SIZE
+                and self.transport
+            ):
+                self.transport.pause_reading()
+
+            if self._data_received:
+                self._data_received.set()
+        except Exception:
+            error_logger.exception("protocol.data_received")

sanic/server/protocols/websocket_protocol.py

@@ -0,0 +1,164 @@
+from typing import TYPE_CHECKING, Optional, Sequence
+
+from websockets.connection import CLOSED, CLOSING, OPEN
+from websockets.server import ServerConnection
+
+from sanic.exceptions import ServerError
+from sanic.log import error_logger
+from sanic.server import HttpProtocol
+
+from ..websockets.impl import WebsocketImplProtocol
+
+
+if TYPE_CHECKING:
+    from websockets import http11
+
+
+class WebSocketProtocol(HttpProtocol):
+
+    websocket: Optional[WebsocketImplProtocol]
+    websocket_timeout: float
+    websocket_max_size = Optional[int]
+    websocket_ping_interval = Optional[float]
+    websocket_ping_timeout = Optional[float]
+
+    def __init__(
+        self,
+        *args,
+        websocket_timeout: float = 10.0,
+        websocket_max_size: Optional[int] = None,
+        websocket_max_queue: Optional[int] = None,  # max_queue is deprecated
+        websocket_read_limit: Optional[int] = None,  # read_limit is deprecated
+        websocket_write_limit: Optional[int] = None,  # write_limit deprecated
+        websocket_ping_interval: Optional[float] = 20.0,
+        websocket_ping_timeout: Optional[float] = 20.0,
+        **kwargs,
+    ):
+        super().__init__(*args, **kwargs)
+        self.websocket = None
+        self.websocket_timeout = websocket_timeout
+        self.websocket_max_size = websocket_max_size
+        if websocket_max_queue is not None and websocket_max_queue > 0:
+            # TODO: Reminder remove this warning in v22.3
+            error_logger.warning(
+                DeprecationWarning(
+                    "Websocket no longer uses queueing, so websocket_max_queue"
+                    " is no longer required."
+                )
+            )
+        if websocket_read_limit is not None and websocket_read_limit > 0:
+            # TODO: Reminder remove this warning in v22.3
+            error_logger.warning(
+                DeprecationWarning(
+                    "Websocket no longer uses read buffers, so "
+                    "websocket_read_limit is not required."
+                )
+            )
+        if websocket_write_limit is not None and websocket_write_limit > 0:
+            # TODO: Reminder remove this warning in v22.3
+            error_logger.warning(
+                DeprecationWarning(
+                    "Websocket no longer uses write buffers, so "
+                    "websocket_write_limit is not required."
+                )
+            )
+        self.websocket_ping_interval = websocket_ping_interval
+        self.websocket_ping_timeout = websocket_ping_timeout
+
+    def connection_lost(self, exc):
+        if self.websocket is not None:
+            self.websocket.connection_lost(exc)
+        super().connection_lost(exc)
+
+    def data_received(self, data):
+        if self.websocket is not None:
+            self.websocket.data_received(data)
+        else:
+            # Pass it to HttpProtocol handler first
+            # That will (hopefully) upgrade it to a websocket.
+            super().data_received(data)
+
+    def eof_received(self) -> Optional[bool]:
+        if self.websocket is not None:
+            return self.websocket.eof_received()
+        else:
+            return False
+
+    def close(self, timeout: Optional[float] = None):
+        # Called by HttpProtocol at the end of connection_task
+        # If we've upgraded to websocket, we do our own closing
+        if self.websocket is not None:
+            # Note, we don't want to use websocket.close()
+            # That is used for user's application code to send a
+            # websocket close packet. This is different.
+            self.websocket.end_connection(1001)
+        else:
+            super().close()
+
+    def close_if_idle(self):
+        # Called by Sanic Server when shutting down
+        # If we've upgraded to websocket, shut it down
+        if self.websocket is not None:
+            if self.websocket.connection.state in (CLOSING, CLOSED):
+                return True
+            elif self.websocket.loop is not None:
+                self.websocket.loop.create_task(self.websocket.close(1001))
+            else:
+                self.websocket.end_connection(1001)
+        else:
+            return super().close_if_idle()
+
+    async def websocket_handshake(
+        self, request, subprotocols=Optional[Sequence[str]]
+    ):
+        # let the websockets package do the handshake with the client
+        try:
+            if subprotocols is not None:
+                # subprotocols can be a set or frozenset,
+                # but ServerConnection needs a list
+                subprotocols = list(subprotocols)
+            ws_conn = ServerConnection(
+                max_size=self.websocket_max_size,
+                subprotocols=subprotocols,
+                state=OPEN,
+                logger=error_logger,
+            )
+            resp: "http11.Response" = ws_conn.accept(request)
+        except Exception:
+            msg = (
+                "Failed to open a WebSocket connection.\n"
+                "See server log for more information.\n"
+            )
+            raise ServerError(msg, status_code=500)
+        if 100 <= resp.status_code <= 299:
+            rbody = "".join(
+                [
+                    "HTTP/1.1 ",
+                    str(resp.status_code),
+                    " ",
+                    resp.reason_phrase,
+                    "\r\n",
+                ]
+            )
+            rbody += "".join(f"{k}: {v}\r\n" for k, v in resp.headers.items())
+            if resp.body is not None:
+                rbody += f"\r\n{resp.body}\r\n\r\n"
+            else:
+                rbody += "\r\n"
+            await super().send(rbody.encode())
+        else:
+            raise ServerError(resp.body, resp.status_code)
+        self.websocket = WebsocketImplProtocol(
+            ws_conn,
+            ping_interval=self.websocket_ping_interval,
+            ping_timeout=self.websocket_ping_timeout,
+            close_timeout=self.websocket_timeout,
+        )
+        loop = (
+            request.transport.loop
+            if hasattr(request, "transport")
+            and hasattr(request.transport, "loop")
+            else None
+        )
+        await self.websocket.connection_made(self, loop=loop)
+        return self.websocket

sanic/server/runners.py

@@ -0,0 +1,280 @@
+from __future__ import annotations
+
+from ssl import SSLContext
+from typing import TYPE_CHECKING, Dict, Optional, Type, Union
+
+from sanic.config import Config
+from sanic.server.events import trigger_events
+
+
+if TYPE_CHECKING:
+    from sanic.app import Sanic
+
+import asyncio
+import multiprocessing
+import os
+import socket
+
+from functools import partial
+from signal import SIG_IGN, SIGINT, SIGTERM, Signals
+from signal import signal as signal_func
+
+from sanic.compat import OS_IS_WINDOWS, ctrlc_workaround_for_windows
+from sanic.log import error_logger, logger
+from sanic.models.server_types import Signal
+from sanic.server.async_server import AsyncioServer
+from sanic.server.protocols.http_protocol import HttpProtocol
+from sanic.server.socket import (
+    bind_socket,
+    bind_unix_socket,
+    remove_unix_socket,
+)
+
+
+def serve(
+    host,
+    port,
+    app: Sanic,
+    ssl: Optional[SSLContext] = None,
+    sock: Optional[socket.socket] = None,
+    unix: Optional[str] = None,
+    reuse_port: bool = False,
+    loop=None,
+    protocol: Type[asyncio.Protocol] = HttpProtocol,
+    backlog: int = 100,
+    register_sys_signals: bool = True,
+    run_multiple: bool = False,
+    run_async: bool = False,
+    connections=None,
+    signal=Signal(),
+    state=None,
+    asyncio_server_kwargs=None,
+):
+    """Start asynchronous HTTP Server on an individual process.
+
+    :param host: Address to host on
+    :param port: Port to host on
+    :param before_start: function to be executed before the server starts
+                         listening. Takes arguments `app` instance and `loop`
+    :param after_start: function to be executed after the server starts
+                        listening. Takes  arguments `app` instance and `loop`
+    :param before_stop: function to be executed when a stop signal is
+                        received before it is respected. Takes arguments
+                        `app` instance and `loop`
+    :param after_stop: function to be executed when a stop signal is
+                       received after it is respected. Takes arguments
+                       `app` instance and `loop`
+    :param ssl: SSLContext
+    :param sock: Socket for the server to accept connections from
+    :param unix: Unix socket to listen on instead of TCP port
+    :param reuse_port: `True` for multiple workers
+    :param loop: asyncio compatible event loop
+    :param run_async: bool: Do not create a new event loop for the server,
+                      and return an AsyncServer object rather than running it
+    :param asyncio_server_kwargs: key-value args for asyncio/uvloop
+                                  create_server method
+    :return: Nothing
+    """
+    if not run_async and not loop:
+        # create new event_loop after fork
+        loop = asyncio.new_event_loop()
+        asyncio.set_event_loop(loop)
+
+    if app.debug:
+        loop.set_debug(app.debug)
+
+    app.asgi = False
+
+    connections = connections if connections is not None else set()
+    protocol_kwargs = _build_protocol_kwargs(protocol, app.config)
+    server = partial(
+        protocol,
+        loop=loop,
+        connections=connections,
+        signal=signal,
+        app=app,
+        state=state,
+        unix=unix,
+        **protocol_kwargs,
+    )
+    asyncio_server_kwargs = (
+        asyncio_server_kwargs if asyncio_server_kwargs else {}
+    )
+    # UNIX sockets are always bound by us (to preserve semantics between modes)
+    if unix:
+        sock = bind_unix_socket(unix, backlog=backlog)
+    server_coroutine = loop.create_server(
+        server,
+        None if sock else host,
+        None if sock else port,
+        ssl=ssl,
+        reuse_port=reuse_port,
+        sock=sock,
+        backlog=backlog,
+        **asyncio_server_kwargs,
+    )
+
+    if run_async:
+        return AsyncioServer(
+            app=app,
+            loop=loop,
+            serve_coro=server_coroutine,
+            connections=connections,
+        )
+
+    loop.run_until_complete(app._startup())
+    loop.run_until_complete(app._server_event("init", "before"))
+
+    try:
+        http_server = loop.run_until_complete(server_coroutine)
+    except BaseException:
+        error_logger.exception("Unable to start server")
+        return
+
+    # Ignore SIGINT when run_multiple
+    if run_multiple:
+        signal_func(SIGINT, SIG_IGN)
+
+    # Register signals for graceful termination
+    if register_sys_signals:
+        if OS_IS_WINDOWS:
+            ctrlc_workaround_for_windows(app)
+        else:
+            for _signal in [SIGTERM] if run_multiple else [SIGINT, SIGTERM]:
+                loop.add_signal_handler(_signal, app.stop)
+
+    loop.run_until_complete(app._server_event("init", "after"))
+    pid = os.getpid()
+    try:
+        logger.info("Starting worker [%s]", pid)
+        loop.run_forever()
+    finally:
+        logger.info("Stopping worker [%s]", pid)
+
+        # Run the on_stop function if provided
+        loop.run_until_complete(app._server_event("shutdown", "before"))
+
+        # Wait for event loop to finish and all connections to drain
+        http_server.close()
+        loop.run_until_complete(http_server.wait_closed())
+
+        # Complete all tasks on the loop
+        signal.stopped = True
+        for connection in connections:
+            connection.close_if_idle()
+
+        # Gracefully shutdown timeout.
+        # We should provide graceful_shutdown_timeout,
+        # instead of letting connection hangs forever.
+        # Let's roughly calcucate time.
+        graceful = app.config.GRACEFUL_SHUTDOWN_TIMEOUT
+        start_shutdown: float = 0
+        while connections and (start_shutdown < graceful):
+            loop.run_until_complete(asyncio.sleep(0.1))
+            start_shutdown = start_shutdown + 0.1
+
+        # Force close non-idle connection after waiting for
+        # graceful_shutdown_timeout
+        for conn in connections:
+            if hasattr(conn, "websocket") and conn.websocket:
+                conn.websocket.fail_connection(code=1001)
+            else:
+                conn.abort()
+        loop.run_until_complete(app._server_event("shutdown", "after"))
+
+        remove_unix_socket(unix)
+
+
+def serve_single(server_settings):
+    main_start = server_settings.pop("main_start", None)
+    main_stop = server_settings.pop("main_stop", None)
+
+    if not server_settings.get("run_async"):
+        # create new event_loop after fork
+        loop = asyncio.new_event_loop()
+        asyncio.set_event_loop(loop)
+        server_settings["loop"] = loop
+
+    trigger_events(main_start, server_settings["loop"])
+    serve(**server_settings)
+    trigger_events(main_stop, server_settings["loop"])
+
+    server_settings["loop"].close()
+
+
+def serve_multiple(server_settings, workers):
+    """Start multiple server processes simultaneously.  Stop on interrupt
+    and terminate signals, and drain connections when complete.
+
+    :param server_settings: kw arguments to be passed to the serve function
+    :param workers: number of workers to launch
+    :param stop_event: if provided, is used as a stop signal
+    :return:
+    """
+    server_settings["reuse_port"] = True
+    server_settings["run_multiple"] = True
+
+    main_start = server_settings.pop("main_start", None)
+    main_stop = server_settings.pop("main_stop", None)
+    loop = asyncio.new_event_loop()
+    asyncio.set_event_loop(loop)
+
+    trigger_events(main_start, loop)
+
+    # Create a listening socket or use the one in settings
+    sock = server_settings.get("sock")
+    unix = server_settings["unix"]
+    backlog = server_settings["backlog"]
+    if unix:
+        sock = bind_unix_socket(unix, backlog=backlog)
+        server_settings["unix"] = unix
+    if sock is None:
+        sock = bind_socket(
+            server_settings["host"], server_settings["port"], backlog=backlog
+        )
+        sock.set_inheritable(True)
+        server_settings["sock"] = sock
+        server_settings["host"] = None
+        server_settings["port"] = None
+
+    processes = []
+
+    def sig_handler(signal, frame):
+        logger.info("Received signal %s. Shutting down.", Signals(signal).name)
+        for process in processes:
+            os.kill(process.pid, SIGTERM)
+
+    signal_func(SIGINT, lambda s, f: sig_handler(s, f))
+    signal_func(SIGTERM, lambda s, f: sig_handler(s, f))
+    mp = multiprocessing.get_context("fork")
+
+    for _ in range(workers):
+        process = mp.Process(target=serve, kwargs=server_settings)
+        process.daemon = True
+        process.start()
+        processes.append(process)
+
+    for process in processes:
+        process.join()
+
+    # the above processes will block this until they're stopped
+    for process in processes:
+        process.terminate()
+
+    trigger_events(main_stop, loop)
+
+    sock.close()
+    loop.close()
+    remove_unix_socket(unix)
+
+
+def _build_protocol_kwargs(
+    protocol: Type[asyncio.Protocol], config: Config
+) -> Dict[str, Union[int, float]]:
+    if hasattr(protocol, "websocket_handshake"):
+        return {
+            "websocket_max_size": config.WEBSOCKET_MAX_SIZE,
+            "websocket_ping_timeout": config.WEBSOCKET_PING_TIMEOUT,
+            "websocket_ping_interval": config.WEBSOCKET_PING_INTERVAL,
+        }
+    return {}

sanic/server/socket.py

@@ -0,0 +1,87 @@
+from __future__ import annotations
+
+import os
+import secrets
+import socket
+import stat
+
+from ipaddress import ip_address
+from typing import Optional
+
+
+def bind_socket(host: str, port: int, *, backlog=100) -> socket.socket:
+    """Create TCP server socket.
+    :param host: IPv4, IPv6 or hostname may be specified
+    :param port: TCP port number
+    :param backlog: Maximum number of connections to queue
+    :return: socket.socket object
+    """
+    try:  # IP address: family must be specified for IPv6 at least
+        ip = ip_address(host)
+        host = str(ip)
+        sock = socket.socket(
+            socket.AF_INET6 if ip.version == 6 else socket.AF_INET
+        )
+    except ValueError:  # Hostname, may become AF_INET or AF_INET6
+        sock = socket.socket()
+    sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
+    sock.bind((host, port))
+    sock.listen(backlog)
+    return sock
+
+
+def bind_unix_socket(path: str, *, mode=0o666, backlog=100) -> socket.socket:
+    """Create unix socket.
+    :param path: filesystem path
+    :param backlog: Maximum number of connections to queue
+    :return: socket.socket object
+    """
+    """Open or atomically replace existing socket with zero downtime."""
+    # Sanitise and pre-verify socket path
+    path = os.path.abspath(path)
+    folder = os.path.dirname(path)
+    if not os.path.isdir(folder):
+        raise FileNotFoundError(f"Socket folder does not exist: {folder}")
+    try:
+        if not stat.S_ISSOCK(os.stat(path, follow_symlinks=False).st_mode):
+            raise FileExistsError(f"Existing file is not a socket: {path}")
+    except FileNotFoundError:
+        pass
+    # Create new socket with a random temporary name
+    tmp_path = f"{path}.{secrets.token_urlsafe()}"
+    sock = socket.socket(socket.AF_UNIX)
+    try:
+        # Critical section begins (filename races)
+        sock.bind(tmp_path)
+        try:
+            os.chmod(tmp_path, mode)
+            # Start listening before rename to avoid connection failures
+            sock.listen(backlog)
+            os.rename(tmp_path, path)
+        except:  # noqa: E722
+            try:
+                os.unlink(tmp_path)
+            finally:
+                raise
+    except:  # noqa: E722
+        try:
+            sock.close()
+        finally:
+            raise
+    return sock
+
+
+def remove_unix_socket(path: Optional[str]) -> None:
+    """Remove dead unix socket during server exit."""
+    if not path:
+        return
+    try:
+        if stat.S_ISSOCK(os.stat(path, follow_symlinks=False).st_mode):
+            # Is it actually dead (doesn't belong to a new server instance)?
+            with socket.socket(socket.AF_UNIX) as testsock:
+                try:
+                    testsock.connect(path)
+                except ConnectionRefusedError:
+                    os.unlink(path)
+    except FileNotFoundError:
+        pass

sanic/server/websockets/connection.py

@@ -0,0 +1,82 @@
+from typing import (
+    Any,
+    Awaitable,
+    Callable,
+    Dict,
+    List,
+    MutableMapping,
+    Optional,
+    Union,
+)
+
+
+ASIMessage = MutableMapping[str, Any]
+
+
+class WebSocketConnection:
+    """
+    This is for ASGI Connections.
+    It provides an interface similar to WebsocketProtocol, but
+    sends/receives over an ASGI connection.
+    """
+
+    # TODO
+    # - Implement ping/pong
+
+    def __init__(
+        self,
+        send: Callable[[ASIMessage], Awaitable[None]],
+        receive: Callable[[], Awaitable[ASIMessage]],
+        subprotocols: Optional[List[str]] = None,
+    ) -> None:
+        self._send = send
+        self._receive = receive
+        self._subprotocols = subprotocols or []
+
+    async def send(self, data: Union[str, bytes], *args, **kwargs) -> None:
+        message: Dict[str, Union[str, bytes]] = {"type": "websocket.send"}
+
+        if isinstance(data, bytes):
+            message.update({"bytes": data})
+        else:
+            message.update({"text": str(data)})
+
+        await self._send(message)
+
+    async def recv(self, *args, **kwargs) -> Optional[str]:
+        message = await self._receive()
+
+        if message["type"] == "websocket.receive":
+            return message["text"]
+        elif message["type"] == "websocket.disconnect":
+            pass
+
+        return None
+
+    receive = recv
+
+    async def accept(self, subprotocols: Optional[List[str]] = None) -> None:
+        subprotocol = None
+        if subprotocols:
+            for subp in subprotocols:
+                if subp in self.subprotocols:
+                    subprotocol = subp
+                    break
+
+        await self._send(
+            {
+                "type": "websocket.accept",
+                "subprotocol": subprotocol,
+            }
+        )
+
+    async def close(self, code: int = 1000, reason: str = "") -> None:
+        pass
+
+    @property
+    def subprotocols(self):
+        return self._subprotocols
+
+    @subprotocols.setter
+    def subprotocols(self, subprotocols: Optional[List[str]] = None):
+        self._subprotocols = subprotocols or []

sanic/server/websockets/frame.py

@@ -0,0 +1,294 @@
+import asyncio
+import codecs
+
+from typing import TYPE_CHECKING, AsyncIterator, List, Optional
+
+from websockets.frames import Frame, Opcode
+from websockets.typing import Data
+
+from sanic.exceptions import ServerError
+
+
+if TYPE_CHECKING:
+    from .impl import WebsocketImplProtocol
+
+UTF8Decoder = codecs.getincrementaldecoder("utf-8")
+
+
+class WebsocketFrameAssembler:
+    """
+    Assemble a message from frames.
+    Code borrowed from aaugustin/websockets project:
+    https://github.com/aaugustin/websockets/blob/6eb98dd8fa5b2c896b9f6be7e8d117708da82a39/src/websockets/sync/messages.py
+    """
+
+    __slots__ = (
+        "protocol",
+        "read_mutex",
+        "write_mutex",
+        "message_complete",
+        "message_fetched",
+        "get_in_progress",
+        "decoder",
+        "completed_queue",
+        "chunks",
+        "chunks_queue",
+        "paused",
+        "get_id",
+        "put_id",
+    )
+    if TYPE_CHECKING:
+        protocol: "WebsocketImplProtocol"
+        read_mutex: asyncio.Lock
+        write_mutex: asyncio.Lock
+        message_complete: asyncio.Event
+        message_fetched: asyncio.Event
+        completed_queue: asyncio.Queue
+        get_in_progress: bool
+        decoder: Optional[codecs.IncrementalDecoder]
+        # For streaming chunks rather than messages:
+        chunks: List[Data]
+        chunks_queue: Optional[asyncio.Queue[Optional[Data]]]
+        paused: bool
+
+    def __init__(self, protocol) -> None:
+
+        self.protocol = protocol
+
+        self.read_mutex = asyncio.Lock()
+        self.write_mutex = asyncio.Lock()
+
+        self.completed_queue = asyncio.Queue(
+            maxsize=1
+        )  # type: asyncio.Queue[Data]
+
+        # put() sets this event to tell get() that a message can be fetched.
+        self.message_complete = asyncio.Event()
+        # get() sets this event to let put()
+        self.message_fetched = asyncio.Event()
+
+        # This flag prevents concurrent calls to get() by user code.
+        self.get_in_progress = False
+
+        # Decoder for text frames, None for binary frames.
+        self.decoder = None
+
+        # Buffer data from frames belonging to the same message.
+        self.chunks = []
+
+        # When switching from "buffering" to "streaming", we use a thread-safe
+        # queue for transferring frames from the writing thread (library code)
+        # to the reading thread (user code). We're buffering when chunks_queue
+        # is None and streaming when it's a Queue. None is a sentinel
+        # value marking the end of the stream, superseding message_complete.
+
+        # Stream data from frames belonging to the same message.
+        self.chunks_queue = None
+
+        # Flag to indicate we've paused the protocol
+        self.paused = False
+
+    async def get(self, timeout: Optional[float] = None) -> Optional[Data]:
+        """
+        Read the next message.
+        :meth:`get` returns a single :class:`str` or :class:`bytes`.
+        If the :message was fragmented, :meth:`get` waits until the last frame
+        is received, then it reassembles the message.
+        If ``timeout`` is set and elapses before a complete message is
+        received, :meth:`get` returns ``None``.
+        """
+        async with self.read_mutex:
+            if timeout is not None and timeout <= 0:
+                if not self.message_complete.is_set():
+                    return None
+            if self.get_in_progress:
+                # This should be guarded against with the read_mutex,
+                # exception is only here as a failsafe
+                raise ServerError(
+                    "Called get() on Websocket frame assembler "
+                    "while asynchronous get is already in progress."
+                )
+            self.get_in_progress = True
+
+            # If the message_complete event isn't set yet, release the lock to
+            # allow put() to run and eventually set it.
+            # Locking with get_in_progress ensures only one task can get here.
+            if timeout is None:
+                completed = await self.message_complete.wait()
+            elif timeout <= 0:
+                completed = self.message_complete.is_set()
+            else:
+                try:
+                    await asyncio.wait_for(
+                        self.message_complete.wait(), timeout=timeout
+                    )
+                except asyncio.TimeoutError:
+                    ...
+                finally:
+                    completed = self.message_complete.is_set()
+
+            # Unpause the transport, if its paused
+            if self.paused:
+                self.protocol.resume_frames()
+                self.paused = False
+            if not self.get_in_progress:
+                # This should be guarded against with the read_mutex,
+                # exception is here as a failsafe
+                raise ServerError(
+                    "State of Websocket frame assembler was modified while an "
+                    "asynchronous get was in progress."
+                )
+            self.get_in_progress = False
+
+            # Waiting for a complete message timed out.
+            if not completed:
+                return None
+            if not self.message_complete.is_set():
+                return None
+
+            self.message_complete.clear()
+
+            joiner: Data = b"" if self.decoder is None else ""
+            # mypy cannot figure out that chunks have the proper type.
+            message: Data = joiner.join(self.chunks)  # type: ignore
+            if self.message_fetched.is_set():
+                # This should be guarded against with the read_mutex,
+                # and get_in_progress check, this exception is here
+                # as a failsafe
+                raise ServerError(
+                    "Websocket get() found a message when "
+                    "state was already fetched."
+                )
+            self.message_fetched.set()
+            self.chunks = []
+            # this should already be None, but set it here for safety
+            self.chunks_queue = None
+            return message
+
+    async def get_iter(self) -> AsyncIterator[Data]:
+        """
+        Stream the next message.
+        Iterating the return value of :meth:`get_iter` yields a :class:`str`
+        or :class:`bytes` for each frame in the message.
+        """
+        async with self.read_mutex:
+            if self.get_in_progress:
+                # This should be guarded against with the read_mutex,
+                # exception is only here as a failsafe
+                raise ServerError(
+                    "Called get_iter on Websocket frame assembler "
+                    "while asynchronous get is already in progress."
+                )
+            self.get_in_progress = True
+
+            chunks = self.chunks
+            self.chunks = []
+            self.chunks_queue = asyncio.Queue()
+
+            # Sending None in chunk_queue supersedes setting message_complete
+            # when switching to "streaming". If message is already complete
+            # when the switch happens, put() didn't send None, so we have to.
+            if self.message_complete.is_set():
+                await self.chunks_queue.put(None)
+
+            # Locking with get_in_progress ensures only one task can get here
+            for c in chunks:
+                yield c
+            while True:
+                chunk = await self.chunks_queue.get()
+                if chunk is None:
+                    break
+                yield chunk
+
+            # Unpause the transport, if its paused
+            if self.paused:
+                self.protocol.resume_frames()
+                self.paused = False
+            if not self.get_in_progress:
+                # This should be guarded against with the read_mutex,
+                # exception is here as a failsafe
+                raise ServerError(
+                    "State of Websocket frame assembler was modified while an "
+                    "asynchronous get was in progress."
+                )
+            self.get_in_progress = False
+            if not self.message_complete.is_set():
+                # This should be guarded against with the read_mutex,
+                # exception is here as a failsafe
+                raise ServerError(
+                    "Websocket frame assembler chunks queue ended before "
+                    "message was complete."
+                )
+            self.message_complete.clear()
+            if self.message_fetched.is_set():
+                # This should be guarded against with the read_mutex,
+                # and get_in_progress check, this exception is
+                # here as a failsafe
+                raise ServerError(
+                    "Websocket get_iter() found a message when state was "
+                    "already fetched."
+                )
+
+            self.message_fetched.set()
+            # this should already be empty, but set it here for safety
+            self.chunks = []
+            self.chunks_queue = None
+
+    async def put(self, frame: Frame) -> None:
+        """
+        Add ``frame`` to the next message.
+        When ``frame`` is the final frame in a message, :meth:`put` waits
+        until the message is fetched, either by calling :meth:`get` or by
+        iterating the return value of :meth:`get_iter`.
+        :meth:`put` assumes that the stream of frames respects the protocol.
+        If it doesn't, the behavior is undefined.
+        """
+
+        async with self.write_mutex:
+            if frame.opcode is Opcode.TEXT:
+                self.decoder = UTF8Decoder(errors="strict")
+            elif frame.opcode is Opcode.BINARY:
+                self.decoder = None
+            elif frame.opcode is Opcode.CONT:
+                pass
+            else:
+                # Ignore control frames.
+                return
+            data: Data
+            if self.decoder is not None:
+                data = self.decoder.decode(frame.data, frame.fin)
+            else:
+                data = frame.data
+            if self.chunks_queue is None:
+                self.chunks.append(data)
+            else:
+                await self.chunks_queue.put(data)
+
+            if not frame.fin:
+                return
+            if not self.get_in_progress:
+                # nobody is waiting for this frame, so try to pause subsequent
+                # frames at the protocol level
+                self.paused = self.protocol.pause_frames()
+            # Message is complete. Wait until it's fetched to return.
+
+            if self.chunks_queue is not None:
+                await self.chunks_queue.put(None)
+            if self.message_complete.is_set():
+                # This should be guarded against with the write_mutex
+                raise ServerError(
+                    "Websocket put() got a new message when a message was "
+                    "already in its chamber."
+                )
+            self.message_complete.set()  # Signal to get() it can serve the
+            if self.message_fetched.is_set():
+                # This should be guarded against with the write_mutex
+                raise ServerError(
+                    "Websocket put() got a new message when the previous "
+                    "message was not yet fetched."
+                )
+
+            # Allow get() to run and eventually set the event.
+            await self.message_fetched.wait()
+            self.message_fetched.clear()
+            self.decoder = None

sanic/server/websockets/impl.py

@@ -0,0 +1,834 @@
+import asyncio
+import random
+import struct
+
+from typing import (
+    AsyncIterator,
+    Dict,
+    Iterable,
+    Mapping,
+    Optional,
+    Sequence,
+    Union,
+)
+
+from websockets.connection import CLOSED, CLOSING, OPEN, Event
+from websockets.exceptions import ConnectionClosed, ConnectionClosedError
+from websockets.frames import Frame, Opcode
+from websockets.server import ServerConnection
+from websockets.typing import Data
+
+from sanic.log import error_logger, logger
+from sanic.server.protocols.base_protocol import SanicProtocol
+
+from ...exceptions import ServerError, WebsocketClosed
+from .frame import WebsocketFrameAssembler
+
+
+class WebsocketImplProtocol:
+    connection: ServerConnection
+    io_proto: Optional[SanicProtocol]
+    loop: Optional[asyncio.AbstractEventLoop]
+    max_queue: int
+    close_timeout: float
+    ping_interval: Optional[float]
+    ping_timeout: Optional[float]
+    assembler: WebsocketFrameAssembler
+    # Dict[bytes, asyncio.Future[None]]
+    pings: Dict[bytes, asyncio.Future]
+    conn_mutex: asyncio.Lock
+    recv_lock: asyncio.Lock
+    recv_cancel: Optional[asyncio.Future]
+    process_event_mutex: asyncio.Lock
+    can_pause: bool
+    # Optional[asyncio.Future[None]]
+    data_finished_fut: Optional[asyncio.Future]
+    # Optional[asyncio.Future[None]]
+    pause_frame_fut: Optional[asyncio.Future]
+    # Optional[asyncio.Future[None]]
+    connection_lost_waiter: Optional[asyncio.Future]
+    keepalive_ping_task: Optional[asyncio.Task]
+    auto_closer_task: Optional[asyncio.Task]
+
+    def __init__(
+        self,
+        connection,
+        max_queue=None,
+        ping_interval: Optional[float] = 20,
+        ping_timeout: Optional[float] = 20,
+        close_timeout: float = 10,
+        loop=None,
+    ):
+        self.connection = connection
+        self.io_proto = None
+        self.loop = None
+        self.max_queue = max_queue
+        self.close_timeout = close_timeout
+        self.ping_interval = ping_interval
+        self.ping_timeout = ping_timeout
+        self.assembler = WebsocketFrameAssembler(self)
+        self.pings = {}
+        self.conn_mutex = asyncio.Lock()
+        self.recv_lock = asyncio.Lock()
+        self.recv_cancel = None
+        self.process_event_mutex = asyncio.Lock()
+        self.data_finished_fut = None
+        self.can_pause = True
+        self.pause_frame_fut = None
+        self.keepalive_ping_task = None
+        self.auto_closer_task = None
+        self.connection_lost_waiter = None
+
+    @property
+    def subprotocol(self):
+        return self.connection.subprotocol
+
+    def pause_frames(self):
+        if not self.can_pause:
+            return False
+        if self.pause_frame_fut:
+            logger.debug("Websocket connection already paused.")
+            return False
+        if (not self.loop) or (not self.io_proto):
+            return False
+        if self.io_proto.transport:
+            self.io_proto.transport.pause_reading()
+        self.pause_frame_fut = self.loop.create_future()
+        logger.debug("Websocket connection paused.")
+        return True
+
+    def resume_frames(self):
+        if not self.pause_frame_fut:
+            logger.debug("Websocket connection not paused.")
+            return False
+        if (not self.loop) or (not self.io_proto):
+            logger.debug(
+                "Websocket attempting to resume reading frames, "
+                "but connection is gone."
+            )
+            return False
+        if self.io_proto.transport:
+            self.io_proto.transport.resume_reading()
+        self.pause_frame_fut.set_result(None)
+        self.pause_frame_fut = None
+        logger.debug("Websocket connection unpaused.")
+        return True
+
+    async def connection_made(
+        self,
+        io_proto: SanicProtocol,
+        loop: Optional[asyncio.AbstractEventLoop] = None,
+    ):
+        if not loop:
+            try:
+                loop = getattr(io_proto, "loop")
+            except AttributeError:
+                loop = asyncio.get_event_loop()
+        if not loop:
+            # This catch is for mypy type checker
+            # to assert loop is not None here.
+            raise ServerError("Connection received with no asyncio loop.")
+        if self.auto_closer_task:
+            raise ServerError(
+                "Cannot call connection_made more than once "
+                "on a websocket connection."
+            )
+        self.loop = loop
+        self.io_proto = io_proto
+        self.connection_lost_waiter = self.loop.create_future()
+        self.data_finished_fut = asyncio.shield(self.loop.create_future())
+
+        if self.ping_interval:
+            self.keepalive_ping_task = asyncio.create_task(
+                self.keepalive_ping()
+            )
+        self.auto_closer_task = asyncio.create_task(
+            self.auto_close_connection()
+        )
+
+    async def wait_for_connection_lost(self, timeout=None) -> bool:
+        """
+        Wait until the TCP connection is closed or ``timeout`` elapses.
+        If timeout is None, wait forever.
+        Recommend you should pass in self.close_timeout as timeout
+
+        Return ``True`` if the connection is closed and ``False`` otherwise.
+
+        """
+        if not self.connection_lost_waiter:
+            return False
+        if self.connection_lost_waiter.done():
+            return True
+        else:
+            try:
+                await asyncio.wait_for(
+                    asyncio.shield(self.connection_lost_waiter), timeout
+                )
+                return True
+            except asyncio.TimeoutError:
+                # Re-check self.connection_lost_waiter.done() synchronously
+                # because connection_lost() could run between the moment the
+                # timeout occurs and the moment this coroutine resumes running
+                return self.connection_lost_waiter.done()
+
+    async def process_events(self, events: Sequence[Event]) -> None:
+        """
+        Process a list of incoming events.
+        """
+        # Wrapped in a mutex lock, to prevent other incoming events
+        # from processing at the same time
+        async with self.process_event_mutex:
+            for event in events:
+                if not isinstance(event, Frame):
+                    # Event is not a frame. Ignore it.
+                    continue
+                if event.opcode == Opcode.PONG:
+                    await self.process_pong(event)
+                elif event.opcode == Opcode.CLOSE:
+                    if self.recv_cancel:
+                        self.recv_cancel.cancel()
+                else:
+                    await self.assembler.put(event)
+
+    async def process_pong(self, frame: Frame) -> None:
+        if frame.data in self.pings:
+            # Acknowledge all pings up to the one matching this pong.
+            ping_ids = []
+            for ping_id, ping in self.pings.items():
+                ping_ids.append(ping_id)
+                if not ping.done():
+                    ping.set_result(None)
+                if ping_id == frame.data:
+                    break
+            else:  # noqa
+                raise ServerError("ping_id is not in self.pings")
+            # Remove acknowledged pings from self.pings.
+            for ping_id in ping_ids:
+                del self.pings[ping_id]
+
+    async def keepalive_ping(self) -> None:
+        """
+        Send a Ping frame and wait for a Pong frame at regular intervals.
+        This coroutine exits when the connection terminates and one of the
+        following happens:
+        - :meth:`ping` raises :exc:`ConnectionClosed`, or
+        - :meth:`auto_close_connection` cancels :attr:`keepalive_ping_task`.
+        """
+        if self.ping_interval is None:
+            return
+
+        try:
+            while True:
+                await asyncio.sleep(self.ping_interval)
+
+                # ping() raises CancelledError if the connection is closed,
+                # when auto_close_connection() cancels keepalive_ping_task.
+
+                # ping() raises ConnectionClosed if the connection is lost,
+                # when connection_lost() calls abort_pings().
+
+                ping_waiter = await self.ping()
+
+                if self.ping_timeout is not None:
+                    try:
+                        await asyncio.wait_for(ping_waiter, self.ping_timeout)
+                    except asyncio.TimeoutError:
+                        error_logger.warning(
+                            "Websocket timed out waiting for pong"
+                        )
+                        self.fail_connection(1011)
+                        break
+        except asyncio.CancelledError:
+            # It is expected for this task to be cancelled during during
+            # normal operation, when the connection is closed.
+            logger.debug("Websocket keepalive ping task was cancelled.")
+        except (ConnectionClosed, WebsocketClosed):
+            logger.debug("Websocket closed. Keepalive ping task exiting.")
+        except Exception as e:
+            error_logger.warning(
+                "Unexpected exception in websocket keepalive ping task."
+            )
+            logger.debug(str(e))
+
+    def _force_disconnect(self) -> bool:
+        """
+        Internal methdod used by end_connection and fail_connection
+        only when the graceful auto-closer cannot be used
+        """
+        if self.auto_closer_task and not self.auto_closer_task.done():
+            self.auto_closer_task.cancel()
+        if self.data_finished_fut and not self.data_finished_fut.done():
+            self.data_finished_fut.cancel()
+            self.data_finished_fut = None
+        if self.keepalive_ping_task and not self.keepalive_ping_task.done():
+            self.keepalive_ping_task.cancel()
+            self.keepalive_ping_task = None
+        if self.loop and self.io_proto and self.io_proto.transport:
+            self.io_proto.transport.close()
+            self.loop.call_later(
+                self.close_timeout, self.io_proto.transport.abort
+            )
+        # We were never open, or already closed
+        return True
+
+    def fail_connection(self, code: int = 1006, reason: str = "") -> bool:
+        """
+        Fail the WebSocket Connection
+        This requires:
+        1. Stopping all processing of incoming data, which means cancelling
+           pausing the underlying io protocol. The close code will be 1006
+           unless a close frame was received earlier.
+        2. Sending a close frame with an appropriate code if the opening
+           handshake succeeded and the other side is likely to process it.
+        3. Closing the connection. :meth:`auto_close_connection` takes care
+           of this.
+        (The specification describes these steps in the opposite order.)
+        """
+        if self.io_proto and self.io_proto.transport:
+            # Stop new data coming in
+            # In Python Version 3.7: pause_reading is idempotent
+            # ut can be called when the transport is already paused or closed
+            self.io_proto.transport.pause_reading()
+
+            # Keeping fail_connection() synchronous guarantees it can't
+            # get stuck and simplifies the implementation of the callers.
+            # Not draining the write buffer is acceptable in this context.
+
+            # clear the send buffer
+            _ = self.connection.data_to_send()
+            # If we're not already CLOSED or CLOSING, then send the close.
+            if self.connection.state is OPEN:
+                if code in (1000, 1001):
+                    self.connection.send_close(code, reason)
+                else:
+                    self.connection.fail(code, reason)
+                try:
+                    data_to_send = self.connection.data_to_send()
+                    while (
+                        len(data_to_send)
+                        and self.io_proto
+                        and self.io_proto.transport
+                    ):
+                        frame_data = data_to_send.pop(0)
+                        self.io_proto.transport.write(frame_data)
+                except Exception:
+                    # sending close frames may fail if the
+                    # transport closes during this period
+                    ...
+        if code == 1006:
+            # Special case: 1006 consider the transport already closed
+            self.connection.state = CLOSED
+        if self.data_finished_fut and not self.data_finished_fut.done():
+            # We have a graceful auto-closer. Use it to close the connection.
+            self.data_finished_fut.cancel()
+            self.data_finished_fut = None
+        if (not self.auto_closer_task) or self.auto_closer_task.done():
+            return self._force_disconnect()
+        return False
+
+    def end_connection(self, code=1000, reason=""):
+        # This is like slightly more graceful form of fail_connection
+        # Use this instead of close() when you need an immediate
+        # close and cannot await websocket.close() handshake.
+
+        if code == 1006 or not self.io_proto or not self.io_proto.transport:
+            return self.fail_connection(code, reason)
+
+        # Stop new data coming in
+        # In Python Version 3.7: pause_reading is idempotent
+        # i.e. it can be called when the transport is already paused or closed.
+        self.io_proto.transport.pause_reading()
+        if self.connection.state == OPEN:
+            data_to_send = self.connection.data_to_send()
+            self.connection.send_close(code, reason)
+            data_to_send.extend(self.connection.data_to_send())
+            try:
+                while (
+                    len(data_to_send)
+                    and self.io_proto
+                    and self.io_proto.transport
+                ):
+                    frame_data = data_to_send.pop(0)
+                    self.io_proto.transport.write(frame_data)
+            except Exception:
+                # sending close frames may fail if the
+                # transport closes during this period
+                # But that doesn't matter at this point
+                ...
+        if self.data_finished_fut and not self.data_finished_fut.done():
+            # We have the ability to signal the auto-closer
+            # try to trigger it to auto-close the connection
+            self.data_finished_fut.cancel()
+            self.data_finished_fut = None
+        if (not self.auto_closer_task) or self.auto_closer_task.done():
+            # Auto-closer is not running, do force disconnect
+            return self._force_disconnect()
+        return False
+
+    async def auto_close_connection(self) -> None:
+        """
+        Close the WebSocket Connection
+        When the opening handshake succeeds, :meth:`connection_open` starts
+        this coroutine in a task. It waits for the data transfer phase to
+        complete then it closes the TCP connection cleanly.
+        When the opening handshake fails, :meth:`fail_connection` does the
+        same. There's no data transfer phase in that case.
+        """
+        try:
+            # Wait for the data transfer phase to complete.
+            if self.data_finished_fut:
+                try:
+                    await self.data_finished_fut
+                    logger.debug(
+                        "Websocket task finished. Closing the connection."
+                    )
+                except asyncio.CancelledError:
+                    # Cancelled error is called when data phase is cancelled
+                    # if an error occurred or the client closed the connection
+                    logger.debug(
+                        "Websocket handler cancelled. Closing the connection."
+                    )
+
+            # Cancel the keepalive ping task.
+            if self.keepalive_ping_task:
+                self.keepalive_ping_task.cancel()
+                self.keepalive_ping_task = None
+
+            # Half-close the TCP connection if possible (when there's no TLS).
+            if (
+                self.io_proto
+                and self.io_proto.transport
+                and self.io_proto.transport.can_write_eof()
+            ):
+                logger.debug("Websocket half-closing TCP connection")
+                self.io_proto.transport.write_eof()
+                if self.connection_lost_waiter:
+                    if await self.wait_for_connection_lost(timeout=0):
+                        return
+        except asyncio.CancelledError:
+            ...
+        finally:
+            # The try/finally ensures that the transport never remains open,
+            # even if this coroutine is cancelled (for example).
+            if (not self.io_proto) or (not self.io_proto.transport):
+                # we were never open, or done. Can't do any finalization.
+                return
+            elif (
+                self.connection_lost_waiter
+                and self.connection_lost_waiter.done()
+            ):
+                # connection confirmed closed already, proceed to abort waiter
+                ...
+            elif self.io_proto.transport.is_closing():
+                # Connection is already closing (due to half-close above)
+                # proceed to abort waiter
+                ...
+            else:
+                self.io_proto.transport.close()
+            if not self.connection_lost_waiter:
+                # Our connection monitor task isn't running.
+                try:
+                    await asyncio.sleep(self.close_timeout)
+                except asyncio.CancelledError:
+                    ...
+                if self.io_proto and self.io_proto.transport:
+                    self.io_proto.transport.abort()
+            else:
+                if await self.wait_for_connection_lost(
+                    timeout=self.close_timeout
+                ):
+                    # Connection aborted before the timeout expired.
+                    return
+                error_logger.warning(
+                    "Timeout waiting for TCP connection to close. Aborting"
+                )
+                if self.io_proto and self.io_proto.transport:
+                    self.io_proto.transport.abort()
+
+    def abort_pings(self) -> None:
+        """
+        Raise ConnectionClosed in pending keepalive pings.
+        They'll never receive a pong once the connection is closed.
+        """
+        if self.connection.state is not CLOSED:
+            raise ServerError(
+                "Webscoket about_pings should only be called "
+                "after connection state is changed to CLOSED"
+            )
+
+        for ping in self.pings.values():
+            ping.set_exception(ConnectionClosedError(None, None))
+            # If the exception is never retrieved, it will be logged when ping
+            # is garbage-collected. This is confusing for users.
+            # Given that ping is done (with an exception), canceling it does
+            # nothing, but it prevents logging the exception.
+            ping.cancel()
+
+    async def close(self, code: int = 1000, reason: str = "") -> None:
+        """
+        Perform the closing handshake.
+        This is a websocket-protocol level close.
+        :meth:`close` waits for the other end to complete the handshake and
+        for the TCP connection to terminate.
+        :meth:`close` is idempotent: it doesn't do anything once the
+        connection is closed.
+        :param code: WebSocket close code
+        :param reason: WebSocket close reason
+        """
+        if code == 1006:
+            self.fail_connection(code, reason)
+            return
+        async with self.conn_mutex:
+            if self.connection.state is OPEN:
+                self.connection.send_close(code, reason)
+                data_to_send = self.connection.data_to_send()
+                await self.send_data(data_to_send)
+
+    async def recv(self, timeout: Optional[float] = None) -> Optional[Data]:
+        """
+        Receive the next message.
+        Return a :class:`str` for a text frame and :class:`bytes` for a binary
+        frame.
+        When the end of the message stream is reached, :meth:`recv` raises
+        :exc:`~websockets.exceptions.ConnectionClosed`. Specifically, it
+        raises :exc:`~websockets.exceptions.ConnectionClosedOK` after a normal
+        connection closure and
+        :exc:`~websockets.exceptions.ConnectionClosedError` after a protocol
+        error or a network failure.
+        If ``timeout`` is ``None``, block until a message is received. Else,
+        if no message is received within ``timeout`` seconds, return ``None``.
+        Set ``timeout`` to ``0`` to check if a message was already received.
+        :raises ~websockets.exceptions.ConnectionClosed: when the
+            connection is closed
+        :raises asyncio.CancelledError: if the websocket closes while waiting
+        :raises ServerError: if two tasks call :meth:`recv` or
+            :meth:`recv_streaming` concurrently
+        """
+
+        if self.recv_lock.locked():
+            raise ServerError(
+                "cannot call recv while another task is "
+                "already waiting for the next message"
+            )
+        await self.recv_lock.acquire()
+        if self.connection.state is CLOSED:
+            self.recv_lock.release()
+            raise WebsocketClosed(
+                "Cannot receive from websocket interface after it is closed."
+            )
+        try:
+            self.recv_cancel = asyncio.Future()
+            done, pending = await asyncio.wait(
+                (self.recv_cancel, self.assembler.get(timeout)),
+                return_when=asyncio.FIRST_COMPLETED,
+            )
+            done_task = next(iter(done))
+            if done_task is self.recv_cancel:
+                # recv was cancelled
+                for p in pending:
+                    p.cancel()
+                raise asyncio.CancelledError()
+            else:
+                self.recv_cancel.cancel()
+                return done_task.result()
+        finally:
+            self.recv_cancel = None
+            self.recv_lock.release()
+
+    async def recv_burst(self, max_recv=256) -> Sequence[Data]:
+        """
+        Receive the messages which have arrived since last checking.
+        Return a :class:`list` containing :class:`str` for a text frame
+        and :class:`bytes` for a binary frame.
+        When the end of the message stream is reached, :meth:`recv_burst`
+        raises :exc:`~websockets.exceptions.ConnectionClosed`. Specifically,
+        it raises :exc:`~websockets.exceptions.ConnectionClosedOK` after a
+        normal connection closure and
+        :exc:`~websockets.exceptions.ConnectionClosedError` after a protocol
+        error or a network failure.
+        :raises ~websockets.exceptions.ConnectionClosed: when the
+            connection is closed
+        :raises ServerError: if two tasks call :meth:`recv_burst` or
+            :meth:`recv_streaming` concurrently
+        """
+
+        if self.recv_lock.locked():
+            raise ServerError(
+                "cannot call recv_burst while another task is already waiting "
+                "for the next message"
+            )
+        await self.recv_lock.acquire()
+        if self.connection.state is CLOSED:
+            self.recv_lock.release()
+            raise WebsocketClosed(
+                "Cannot receive from websocket interface after it is closed."
+            )
+        messages = []
+        try:
+            # Prevent pausing the transport when we're
+            # receiving a burst of messages
+            self.can_pause = False
+            self.recv_cancel = asyncio.Future()
+            while True:
+                done, pending = await asyncio.wait(
+                    (self.recv_cancel, self.assembler.get(timeout=0)),
+                    return_when=asyncio.FIRST_COMPLETED,
+                )
+                done_task = next(iter(done))
+                if done_task is self.recv_cancel:
+                    # recv_burst was cancelled
+                    for p in pending:
+                        p.cancel()
+                    raise asyncio.CancelledError()
+                m = done_task.result()
+                if m is None:
+                    # None left in the burst. This is good!
+                    break
+                messages.append(m)
+                if len(messages) >= max_recv:
+                    # Too much data in the pipe. Hit our burst limit.
+                    break
+                # Allow an eventloop iteration for the
+                # next message to pass into the Assembler
+                await asyncio.sleep(0)
+            self.recv_cancel.cancel()
+        finally:
+            self.recv_cancel = None
+            self.can_pause = True
+            self.recv_lock.release()
+        return messages
+
+    async def recv_streaming(self) -> AsyncIterator[Data]:
+        """
+        Receive the next message frame by frame.
+        Return an iterator of :class:`str` for a text frame and :class:`bytes`
+        for a binary frame. The iterator should be exhausted, or else the
+        connection will become unusable.
+        With the exception of the return value, :meth:`recv_streaming` behaves
+        like :meth:`recv`.
+        """
+        if self.recv_lock.locked():
+            raise ServerError(
+                "Cannot call recv_streaming while another task "
+                "is already waiting for the next message"
+            )
+        await self.recv_lock.acquire()
+        if self.connection.state is CLOSED:
+            self.recv_lock.release()
+            raise WebsocketClosed(
+                "Cannot receive from websocket interface after it is closed."
+            )
+        try:
+            cancelled = False
+            self.recv_cancel = asyncio.Future()
+            self.can_pause = False
+            async for m in self.assembler.get_iter():
+                if self.recv_cancel.done():
+                    cancelled = True
+                    break
+                yield m
+            if cancelled:
+                raise asyncio.CancelledError()
+        finally:
+            self.can_pause = True
+            self.recv_cancel = None
+            self.recv_lock.release()
+
+    async def send(self, message: Union[Data, Iterable[Data]]) -> None:
+        """
+        Send a message.
+        A string (:class:`str`) is sent as a `Text frame`_. A bytestring or
+        bytes-like object (:class:`bytes`, :class:`bytearray`, or
+        :class:`memoryview`) is sent as a `Binary frame`_.
+        .. _Text frame: https://tools.ietf.org/html/rfc6455#section-5.6
+        .. _Binary frame: https://tools.ietf.org/html/rfc6455#section-5.6
+        :meth:`send` also accepts an iterable of strings, bytestrings, or
+        bytes-like objects. In that case the message is fragmented. Each item
+        is treated as a message fragment and sent in its own frame. All items
+        must be of the same type, or else :meth:`send` will raise a
+        :exc:`TypeError` and the connection will be closed.
+        :meth:`send` rejects dict-like objects because this is often an error.
+        If you wish to send the keys of a dict-like object as fragments, call
+        its :meth:`~dict.keys` method and pass the result to :meth:`send`.
+        :raises TypeError: for unsupported inputs
+        """
+        async with self.conn_mutex:
+
+            if self.connection.state in (CLOSED, CLOSING):
+                raise WebsocketClosed(
+                    "Cannot write to websocket interface after it is closed."
+                )
+            if (not self.data_finished_fut) or self.data_finished_fut.done():
+                raise ServerError(
+                    "Cannot write to websocket interface after it is finished."
+                )
+
+            # Unfragmented message -- this case must be handled first because
+            # strings and bytes-like objects are iterable.
+
+            if isinstance(message, str):
+                self.connection.send_text(message.encode("utf-8"))
+                await self.send_data(self.connection.data_to_send())
+
+            elif isinstance(message, (bytes, bytearray, memoryview)):
+                self.connection.send_binary(message)
+                await self.send_data(self.connection.data_to_send())
+
+            elif isinstance(message, Mapping):
+                # Catch a common mistake -- passing a dict to send().
+                raise TypeError("data is a dict-like object")
+
+            elif isinstance(message, Iterable):
+                # Fragmented message -- regular iterator.
+                raise NotImplementedError(
+                    "Fragmented websocket messages are not supported."
+                )
+            else:
+                raise TypeError("Websocket data must be bytes, str.")
+
+    async def ping(self, data: Optional[Data] = None) -> asyncio.Future:
+        """
+        Send a ping.
+        Return an :class:`~asyncio.Future` that will be resolved when the
+        corresponding pong is received. You can ignore it if you don't intend
+        to wait.
+        A ping may serve as a keepalive or as a check that the remote endpoint
+        received all messages up to this point::
+            await pong_event = ws.ping()
+            await pong_event # only if you want to wait for the pong
+        By default, the ping contains four random bytes. This payload may be
+        overridden with the optional ``data`` argument which must be a string
+        (which will be encoded to UTF-8) or a bytes-like object.
+        """
+        async with self.conn_mutex:
+            if self.connection.state in (CLOSED, CLOSING):
+                raise WebsocketClosed(
+                    "Cannot send a ping when the websocket interface "
+                    "is closed."
+                )
+            if (not self.io_proto) or (not self.io_proto.loop):
+                raise ServerError(
+                    "Cannot send a ping when the websocket has no I/O "
+                    "protocol attached."
+                )
+            if data is not None:
+                if isinstance(data, str):
+                    data = data.encode("utf-8")
+                elif isinstance(data, (bytearray, memoryview)):
+                    data = bytes(data)
+
+            # Protect against duplicates if a payload is explicitly set.
+            if data in self.pings:
+                raise ValueError(
+                    "already waiting for a pong with the same data"
+                )
+
+            # Generate a unique random payload otherwise.
+            while data is None or data in self.pings:
+                data = struct.pack("!I", random.getrandbits(32))
+
+            self.pings[data] = self.io_proto.loop.create_future()
+
+            self.connection.send_ping(data)
+            await self.send_data(self.connection.data_to_send())
+
+            return asyncio.shield(self.pings[data])
+
+    async def pong(self, data: Data = b"") -> None:
+        """
+        Send a pong.
+        An unsolicited pong may serve as a unidirectional heartbeat.
+        The payload may be set with the optional ``data`` argument which must
+        be a string (which will be encoded to UTF-8) or a bytes-like object.
+        """
+        async with self.conn_mutex:
+            if self.connection.state in (CLOSED, CLOSING):
+                # Cannot send pong after transport is shutting down
+                return
+            if isinstance(data, str):
+                data = data.encode("utf-8")
+            elif isinstance(data, (bytearray, memoryview)):
+                data = bytes(data)
+            self.connection.send_pong(data)
+            await self.send_data(self.connection.data_to_send())
+
+    async def send_data(self, data_to_send):
+        for data in data_to_send:
+            if data:
+                await self.io_proto.send(data)
+            else:
+                # Send an EOF - We don't actually send it,
+                # just trigger to autoclose the connection
+                if (
+                    self.auto_closer_task
+                    and not self.auto_closer_task.done()
+                    and self.data_finished_fut
+                    and not self.data_finished_fut.done()
+                ):
+                    # Auto-close the connection
+                    self.data_finished_fut.set_result(None)
+                else:
+                    # This will fail the connection appropriately
+                    SanicProtocol.close(self.io_proto, timeout=1.0)
+
+    async def async_data_received(self, data_to_send, events_to_process):
+        if self.connection.state in (OPEN, CLOSING) and len(data_to_send) > 0:
+            # receiving data can generate data to send (eg, pong for a ping)
+            # send connection.data_to_send()
+            await self.send_data(data_to_send)
+        if len(events_to_process) > 0:
+            await self.process_events(events_to_process)
+
+    def data_received(self, data):
+        self.connection.receive_data(data)
+        data_to_send = self.connection.data_to_send()
+        events_to_process = self.connection.events_received()
+        if len(data_to_send) > 0 or len(events_to_process) > 0:
+            asyncio.create_task(
+                self.async_data_received(data_to_send, events_to_process)
+            )
+
+    async def async_eof_received(self, data_to_send, events_to_process):
+        # receiving EOF can generate data to send
+        # send connection.data_to_send()
+        if self.connection.state in (OPEN, CLOSING) and len(data_to_send) > 0:
+            await self.send_data(data_to_send)
+        if len(events_to_process) > 0:
+            await self.process_events(events_to_process)
+        if self.recv_cancel:
+            self.recv_cancel.cancel()
+        if (
+            self.auto_closer_task
+            and not self.auto_closer_task.done()
+            and self.data_finished_fut
+            and not self.data_finished_fut.done()
+        ):
+            # Auto-close the connection
+            self.data_finished_fut.set_result(None)
+            # Cancel the running handler if its waiting
+        else:
+            # This will fail the connection appropriately
+            SanicProtocol.close(self.io_proto, timeout=1.0)
+
+    def eof_received(self) -> Optional[bool]:
+        self.connection.receive_eof()
+        data_to_send = self.connection.data_to_send()
+        events_to_process = self.connection.events_received()
+        asyncio.create_task(
+            self.async_eof_received(data_to_send, events_to_process)
+        )
+        return False
+
+    def connection_lost(self, exc):
+        """
+        The WebSocket Connection is Closed.
+        """
+        if not self.connection.state == CLOSED:
+            # signal to the websocket connection handler
+            # we've lost the connection
+            self.connection.fail(code=1006)
+            self.connection.state = CLOSED
+
+        self.abort_pings()
+        if self.connection_lost_waiter:
+            self.connection_lost_waiter.set_result(None)

sanic/signals.py

@@ -5,32 +5,52 @@ import asyncio
 from inspect import isawaitable
 from typing import Any, Dict, List, Optional, Tuple, Union
 
-from sanic_routing import BaseRouter, Route  # type: ignore
+from sanic_routing import BaseRouter, Route, RouteGroup  # type: ignore
 from sanic_routing.exceptions import NotFound  # type: ignore
 from sanic_routing.utils import path_to_parts  # type: ignore
 
 from sanic.exceptions import InvalidSignal
+from sanic.log import error_logger, logger
 from sanic.models.handler_types import SignalHandler
 
 
-RESERVED_NAMESPACES = (
-    "server",
-    "http",
-)
+RESERVED_NAMESPACES = {
+    "server": (
+        # "server.main.start",
+        # "server.main.stop",
+        "server.init.before",
+        "server.init.after",
+        "server.shutdown.before",
+        "server.shutdown.after",
+    ),
+    "http": (
+        "http.lifecycle.begin",
+        "http.lifecycle.complete",
+        "http.lifecycle.exception",
+        "http.lifecycle.handle",
+        "http.lifecycle.read_body",
+        "http.lifecycle.read_head",
+        "http.lifecycle.request",
+        "http.lifecycle.response",
+        "http.routing.after",
+        "http.routing.before",
+        "http.lifecycle.send",
+        "http.middleware.after",
+        "http.middleware.before",
+    ),
+}
+
+
+def _blank():
+    ...
 
 
 class Signal(Route):
-    def get_handler(self, raw_path, method, _):
-        method = method or self.router.DEFAULT_METHOD
-        raw_path = raw_path.lstrip(self.router.delimiter)
-        try:
-            return self.handlers[raw_path][method]
-        except (IndexError, KeyError):
-            raise self.router.method_handler_exception(
-                f"Method '{method}' not found on {self}",
-                method=method,
-                allowed_methods=set(self.methods[raw_path]),
-            )
+    ...
+
+
+class SignalGroup(RouteGroup):
+    ...
 
 
 class SignalRouter(BaseRouter):
@@ -38,6 +58,7 @@ class SignalRouter(BaseRouter):
         super().__init__(
             delimiter=".",
             route_class=Signal,
+            group_class=SignalGroup,
             stacking=True,
         )
         self.ctx.loop = None
@@ -49,7 +70,13 @@ class SignalRouter(BaseRouter):
     ):
         extra = condition or {}
         try:
-            return self.resolve(f".{event}", extra=extra)
+            group, param_basket = self.find_route(
+                f".{event}",
+                self.DEFAULT_METHOD,
+                self,
+                {"__params__": {}, "__matches__": {}},
+                extra=extra,
+            )
         except NotFound:
             message = "Could not find signal %s"
             terms: List[Union[str, Optional[Dict[str, str]]]] = [event]
@@ -58,27 +85,60 @@ class SignalRouter(BaseRouter):
                 terms.append(extra)
             raise NotFound(message % tuple(terms))
 
+        # Regex routes evaluate and can extract params directly. They are set
+        # on param_basket["__params__"]
+        params = param_basket["__params__"]
+        if not params:
+            # If param_basket["__params__"] does not exist, we might have
+            # param_basket["__matches__"], which are indexed based matches
+            # on path segments. They should already be cast types.
+            params = {
+                param.name: param_basket["__matches__"][idx]
+                for idx, param in group.params.items()
+            }
+
+        return group, [route.handler for route in group], params
+
     async def _dispatch(
         self,
         event: str,
         context: Optional[Dict[str, Any]] = None,
         condition: Optional[Dict[str, str]] = None,
-    ) -> None:
-        signal, handlers, params = self.get(event, condition=condition)
+        fail_not_found: bool = True,
+        reverse: bool = False,
+    ) -> Any:
+        try:
+            group, handlers, params = self.get(event, condition=condition)
+        except NotFound as e:
+            if fail_not_found:
+                raise e
+            else:
+                if self.ctx.app.debug:
+                    error_logger.warning(str(e))
+                return None
 
-        signal_event = signal.ctx.event
-        signal_event.set()
+        events = [signal.ctx.event for signal in group]
+        for signal_event in events:
+            signal_event.set()
         if context:
             params.update(context)
 
+        if not reverse:
+            handlers = handlers[::-1]
         try:
             for handler in handlers:
                 if condition is None or condition == handler.__requirements__:
                     maybe_coroutine = handler(**params)
                     if isawaitable(maybe_coroutine):
-                        await maybe_coroutine
+                        retval = await maybe_coroutine
+                        if retval:
+                            return retval
+                    elif maybe_coroutine:
+                        return maybe_coroutine
+            return None
         finally:
-            signal_event.clear()
+            for signal_event in events:
+                signal_event.clear()
 
     async def dispatch(
         self,
@@ -86,14 +146,23 @@ class SignalRouter(BaseRouter):
         *,
         context: Optional[Dict[str, Any]] = None,
         condition: Optional[Dict[str, str]] = None,
-    ) -> asyncio.Task:
-        task = self.ctx.loop.create_task(
-            self._dispatch(
-                event,
-                context=context,
-                condition=condition,
-            )
+        fail_not_found: bool = True,
+        inline: bool = False,
+        reverse: bool = False,
+    ) -> Union[asyncio.Task, Any]:
+        dispatch = self._dispatch(
+            event,
+            context=context,
+            condition=condition,
+            fail_not_found=fail_not_found and inline,
+            reverse=reverse,
         )
+        logger.debug(f"Dispatching signal: {event}")
+
+        if inline:
+            return await dispatch
+
+        task = asyncio.get_running_loop().create_task(dispatch)
         await asyncio.sleep(0)
         return task
 
@@ -116,19 +185,21 @@ class SignalRouter(BaseRouter):
             handler,
             requirements=condition,
             name=name,
-            overwrite=True,
+            append=True,
         )  # type: ignore
 
-    def finalize(self, do_compile: bool = True):
+    def finalize(self, do_compile: bool = True, do_optimize: bool = False):
+        self.add(_blank, "sanic.__signal__.__init__")
+
         try:
             self.ctx.loop = asyncio.get_running_loop()
         except RuntimeError:
             raise RuntimeError("Cannot finalize signals outside of event loop")
 
-        for signal in self.routes.values():
+        for signal in self.routes:
             signal.ctx.event = asyncio.Event()
 
-        return super().finalize(do_compile=do_compile)
+        return super().finalize(do_compile=do_compile, do_optimize=do_optimize)
 
     def _build_event_parts(self, event: str) -> Tuple[str, str, str]:
         parts = path_to_parts(event, self.delimiter)
@@ -139,7 +210,11 @@ class SignalRouter(BaseRouter):
         ):
             raise InvalidSignal("Invalid signal event: %s" % event)
 
-        if parts[0] in RESERVED_NAMESPACES:
+        if (
+            parts[0] in RESERVED_NAMESPACES
+            and event not in RESERVED_NAMESPACES[parts[0]]
+            and not (parts[2].startswith("<") and parts[2].endswith(">"))
+        ):
             raise InvalidSignal(
                 "Cannot declare reserved signal event: %s" % event
             )

sanic/simple.py

@@ -0,0 +1,21 @@
+from pathlib import Path
+
+from sanic import Sanic
+from sanic.exceptions import SanicException
+from sanic.response import redirect
+
+
+def create_simple_server(directory: Path):
+    if not directory.is_dir():
+        raise SanicException(
+            "Cannot setup Sanic Simple Server without a path to a directory"
+        )
+
+    app = Sanic("SimpleServer")
+    app.static("/", directory, name="main")
+
+    @app.get("/")
+    def index(_):
+        return redirect(app.url_for("main", filename="index.html"))
+
+    return app

sanic/touchup/__init__.py

@@ -0,0 +1,8 @@
+from .meta import TouchUpMeta
+from .service import TouchUp
+
+
+__all__ = (
+    "TouchUp",
+    "TouchUpMeta",
+)

sanic/touchup/meta.py

@@ -0,0 +1,22 @@
+from sanic.exceptions import SanicException
+
+from .service import TouchUp
+
+
+class TouchUpMeta(type):
+    def __new__(cls, name, bases, attrs, **kwargs):
+        gen_class = super().__new__(cls, name, bases, attrs, **kwargs)
+
+        methods = attrs.get("__touchup__")
+        attrs["__touched__"] = False
+        if methods:
+
+            for method in methods:
+                if method not in attrs:
+                    raise SanicException(
+                        "Cannot perform touchup on non-existent method: "
+                        f"{name}.{method}"
+                    )
+                TouchUp.register(gen_class, method)
+
+        return gen_class

sanic/touchup/schemes/__init__.py

@@ -0,0 +1,5 @@
+from .base import BaseScheme
+from .ode import OptionalDispatchEvent  # noqa
+
+
+__all__ = ("BaseScheme",)

sanic/touchup/schemes/base.py

@@ -0,0 +1,20 @@
+from abc import ABC, abstractmethod
+from typing import Set, Type
+
+
+class BaseScheme(ABC):
+    ident: str
+    _registry: Set[Type] = set()
+
+    def __init__(self, app) -> None:
+        self.app = app
+
+    @abstractmethod
+    def run(self, method, module_globals) -> None:
+        ...
+
+    def __init_subclass__(cls):
+        BaseScheme._registry.add(cls)
+
+    def __call__(self, method, module_globals):
+        return self.run(method, module_globals)

sanic/touchup/schemes/ode.py

@@ -0,0 +1,67 @@
+from ast import Attribute, Await, Dict, Expr, NodeTransformer, parse
+from inspect import getsource
+from textwrap import dedent
+from typing import Any
+
+from sanic.log import logger
+
+from .base import BaseScheme
+
+
+class OptionalDispatchEvent(BaseScheme):
+    ident = "ODE"
+
+    def __init__(self, app) -> None:
+        super().__init__(app)
+
+        self._registered_events = [
+            signal.path for signal in app.signal_router.routes
+        ]
+
+    def run(self, method, module_globals):
+        raw_source = getsource(method)
+        src = dedent(raw_source)
+        tree = parse(src)
+        node = RemoveDispatch(self._registered_events).visit(tree)
+        compiled_src = compile(node, method.__name__, "exec")
+        exec_locals: Dict[str, Any] = {}
+        exec(compiled_src, module_globals, exec_locals)  # nosec
+
+        return exec_locals[method.__name__]
+
+
+class RemoveDispatch(NodeTransformer):
+    def __init__(self, registered_events) -> None:
+        self._registered_events = registered_events
+
+    def visit_Expr(self, node: Expr) -> Any:
+        call = node.value
+        if isinstance(call, Await):
+            call = call.value
+
+        func = getattr(call, "func", None)
+        args = getattr(call, "args", None)
+        if not func or not args:
+            return node
+
+        if isinstance(func, Attribute) and func.attr == "dispatch":
+            event = args[0]
+            if hasattr(event, "s"):
+                event_name = getattr(event, "value", event.s)
+                if self._not_registered(event_name):
+                    logger.debug(f"Disabling event: {event_name}")
+                    return None
+        return node
+
+    def _not_registered(self, event_name):
+        dynamic = []
+        for event in self._registered_events:
+            if event.endswith(">"):
+                namespace_concern, _ = event.rsplit(".", 1)
+                dynamic.append(namespace_concern)
+
+        namespace_concern, _ = event_name.rsplit(".", 1)
+        return (
+            event_name not in self._registered_events
+            and namespace_concern not in dynamic
+        )

sanic/touchup/service.py

@@ -0,0 +1,33 @@
+from inspect import getmembers, getmodule
+from typing import Set, Tuple, Type
+
+from .schemes import BaseScheme
+
+
+class TouchUp:
+    _registry: Set[Tuple[Type, str]] = set()
+
+    @classmethod
+    def run(cls, app):
+        for target, method_name in cls._registry:
+            method = getattr(target, method_name)
+
+            if app.test_mode:
+                placeholder = f"_{method_name}"
+                if hasattr(target, placeholder):
+                    method = getattr(target, placeholder)
+                else:
+                    setattr(target, placeholder, method)
+
+            module = getmodule(target)
+            module_globals = dict(getmembers(module))
+
+            for scheme in BaseScheme._registry:
+                modified = scheme(app)(method, module_globals)
+                setattr(target, method_name, modified)
+
+            target.__touched__ = True
+
+    @classmethod
+    def register(cls, target, method_name):
+        cls._registry.add((target, method_name))

sanic/utils.py

@@ -105,6 +105,7 @@ def load_module_from_file_location(
             _mod_spec = spec_from_file_location(
                 name, location, *args, **kwargs
             )
+            assert _mod_spec is not None  # type assertion for mypy
             module = module_from_spec(_mod_spec)
             _mod_spec.loader.exec_module(module)  # type: ignore
 

sanic/views.py

@@ -1,7 +1,24 @@
-from typing import Any, Callable, List
+from __future__ import annotations
+
+from typing import (
+    TYPE_CHECKING,
+    Any,
+    Callable,
+    Iterable,
+    List,
+    Optional,
+    Union,
+)
+from warnings import warn
 
 from sanic.constants import HTTP_METHODS
 from sanic.exceptions import InvalidUsage
+from sanic.models.handler_types import RouteHandler
+
+
+if TYPE_CHECKING:
+    from sanic import Sanic
+    from sanic.blueprints import Blueprint
 
 
 class HTTPMethodView:
@@ -40,12 +57,37 @@ class HTTPMethodView:
 
     decorators: List[Callable[[Callable[..., Any]], Callable[..., Any]]] = []
 
+    def __init_subclass__(
+        cls,
+        attach: Optional[Union[Sanic, Blueprint]] = None,
+        uri: str = "",
+        methods: Iterable[str] = frozenset({"GET"}),
+        host: Optional[str] = None,
+        strict_slashes: Optional[bool] = None,
+        version: Optional[int] = None,
+        name: Optional[str] = None,
+        stream: bool = False,
+        version_prefix: str = "/v",
+    ) -> None:
+        if attach:
+            cls.attach(
+                attach,
+                uri=uri,
+                methods=methods,
+                host=host,
+                strict_slashes=strict_slashes,
+                version=version,
+                name=name,
+                stream=stream,
+                version_prefix=version_prefix,
+            )
+
     def dispatch_request(self, request, *args, **kwargs):
         handler = getattr(self, request.method.lower(), None)
         return handler(request, *args, **kwargs)
 
     @classmethod
-    def as_view(cls, *class_args, **class_kwargs):
+    def as_view(cls, *class_args: Any, **class_kwargs: Any) -> RouteHandler:
         """Return view function for use with the routing system, that
         dispatches request to appropriate handler method.
         """
@@ -59,12 +101,37 @@ class HTTPMethodView:
             for decorator in cls.decorators:
                 view = decorator(view)
 
-        view.view_class = cls
+        view.view_class = cls  # type: ignore
         view.__doc__ = cls.__doc__
         view.__module__ = cls.__module__
         view.__name__ = cls.__name__
         return view
 
+    @classmethod
+    def attach(
+        cls,
+        to: Union[Sanic, Blueprint],
+        uri: str,
+        methods: Iterable[str] = frozenset({"GET"}),
+        host: Optional[str] = None,
+        strict_slashes: Optional[bool] = None,
+        version: Optional[int] = None,
+        name: Optional[str] = None,
+        stream: bool = False,
+        version_prefix: str = "/v",
+    ) -> None:
+        to.add_route(
+            cls.as_view(),
+            uri=uri,
+            methods=methods,
+            host=host,
+            strict_slashes=strict_slashes,
+            version=version,
+            name=name,
+            stream=stream,
+            version_prefix=version_prefix,
+        )
+
 
 def stream(func):
     func.is_stream = True
@@ -91,6 +158,11 @@ class CompositionView:
     def __init__(self):
         self.handlers = {}
         self.name = self.__class__.__name__
+        warn(
+            "CompositionView has been deprecated and will be removed in "
+            "v21.12. Please update your view to HTTPMethodView.",
+            DeprecationWarning,
+        )
 
     def __name__(self):
         return self.name

sanic/websocket.py

@@ -1,184 +0,0 @@
-from typing import (
-    Any,
-    Awaitable,
-    Callable,
-    Dict,
-    List,
-    MutableMapping,
-    Optional,
-    Union,
-)
-
-from httptools import HttpParserUpgrade  # type: ignore
-from websockets import (  # type: ignore
-    ConnectionClosed,
-    InvalidHandshake,
-    WebSocketCommonProtocol,
-    handshake,
-)
-
-from sanic.exceptions import InvalidUsage
-from sanic.server import HttpProtocol
-
-
-__all__ = ["ConnectionClosed", "WebSocketProtocol", "WebSocketConnection"]
-
-ASIMessage = MutableMapping[str, Any]
-
-
-class WebSocketProtocol(HttpProtocol):
-    def __init__(
-        self,
-        *args,
-        websocket_timeout=10,
-        websocket_max_size=None,
-        websocket_max_queue=None,
-        websocket_read_limit=2 ** 16,
-        websocket_write_limit=2 ** 16,
-        websocket_ping_interval=20,
-        websocket_ping_timeout=20,
-        **kwargs
-    ):
-        super().__init__(*args, **kwargs)
-        self.websocket = None
-        # self.app = None
-        self.websocket_timeout = websocket_timeout
-        self.websocket_max_size = websocket_max_size
-        self.websocket_max_queue = websocket_max_queue
-        self.websocket_read_limit = websocket_read_limit
-        self.websocket_write_limit = websocket_write_limit
-        self.websocket_ping_interval = websocket_ping_interval
-        self.websocket_ping_timeout = websocket_ping_timeout
-
-    # timeouts make no sense for websocket routes
-    def request_timeout_callback(self):
-        if self.websocket is None:
-            super().request_timeout_callback()
-
-    def response_timeout_callback(self):
-        if self.websocket is None:
-            super().response_timeout_callback()
-
-    def keep_alive_timeout_callback(self):
-        if self.websocket is None:
-            super().keep_alive_timeout_callback()
-
-    def connection_lost(self, exc):
-        if self.websocket is not None:
-            self.websocket.connection_lost(exc)
-        super().connection_lost(exc)
-
-    def data_received(self, data):
-        if self.websocket is not None:
-            # pass the data to the websocket protocol
-            self.websocket.data_received(data)
-        else:
-            try:
-                super().data_received(data)
-            except HttpParserUpgrade:
-                # this is okay, it just indicates we've got an upgrade request
-                pass
-
-    def write_response(self, response):
-        if self.websocket is not None:
-            # websocket requests do not write a response
-            self.transport.close()
-        else:
-            super().write_response(response)
-
-    async def websocket_handshake(self, request, subprotocols=None):
-        # let the websockets package do the handshake with the client
-        headers = {}
-
-        try:
-            key = handshake.check_request(request.headers)
-            handshake.build_response(headers, key)
-        except InvalidHandshake:
-            raise InvalidUsage("Invalid websocket request")
-
-        subprotocol = None
-        if subprotocols and "Sec-Websocket-Protocol" in request.headers:
-            # select a subprotocol
-            client_subprotocols = [
-                p.strip()
-                for p in request.headers["Sec-Websocket-Protocol"].split(",")
-            ]
-            for p in client_subprotocols:
-                if p in subprotocols:
-                    subprotocol = p
-                    headers["Sec-Websocket-Protocol"] = subprotocol
-                    break
-
-        # write the 101 response back to the client
-        rv = b"HTTP/1.1 101 Switching Protocols\r\n"
-        for k, v in headers.items():
-            rv += k.encode("utf-8") + b": " + v.encode("utf-8") + b"\r\n"
-        rv += b"\r\n"
-        request.transport.write(rv)
-
-        # hook up the websocket protocol
-        self.websocket = WebSocketCommonProtocol(
-            close_timeout=self.websocket_timeout,
-            max_size=self.websocket_max_size,
-            max_queue=self.websocket_max_queue,
-            read_limit=self.websocket_read_limit,
-            write_limit=self.websocket_write_limit,
-            ping_interval=self.websocket_ping_interval,
-            ping_timeout=self.websocket_ping_timeout,
-        )
-        # Following two lines are required for websockets 8.x
-        self.websocket.is_client = False
-        self.websocket.side = "server"
-        self.websocket.subprotocol = subprotocol
-        self.websocket.connection_made(request.transport)
-        self.websocket.connection_open()
-        return self.websocket
-
-
-class WebSocketConnection:
-
-    # TODO
-    # - Implement ping/pong
-
-    def __init__(
-        self,
-        send: Callable[[ASIMessage], Awaitable[None]],
-        receive: Callable[[], Awaitable[ASIMessage]],
-        subprotocols: Optional[List[str]] = None,
-    ) -> None:
-        self._send = send
-        self._receive = receive
-        self.subprotocols = subprotocols or []
-
-    async def send(self, data: Union[str, bytes], *args, **kwargs) -> None:
-        message: Dict[str, Union[str, bytes]] = {"type": "websocket.send"}
-
-        if isinstance(data, bytes):
-            message.update({"bytes": data})
-        else:
-            message.update({"text": str(data)})
-
-        await self._send(message)
-
-    async def recv(self, *args, **kwargs) -> Optional[str]:
-        message = await self._receive()
-
-        if message["type"] == "websocket.receive":
-            return message["text"]
-        elif message["type"] == "websocket.disconnect":
-            pass
-
-        return None
-
-    receive = recv
-
-    async def accept(self) -> None:
-        await self._send(
-            {
-                "type": "websocket.accept",
-                "subprotocol": ",".join(list(self.subprotocols)),
-            }
-        )
-
-    async def close(self) -> None:
-        pass

sanic/worker.py

@@ -8,8 +8,8 @@ import traceback
 from gunicorn.workers import base  # type: ignore
 
 from sanic.log import logger
-from sanic.server import HttpProtocol, Signal, serve, trigger_events
-from sanic.websocket import WebSocketProtocol
+from sanic.server import HttpProtocol, Signal, serve
+from sanic.server.protocols.websocket_protocol import WebSocketProtocol
 
 
 try:
@@ -68,10 +68,10 @@ class GunicornWorker(base.Worker):
         )
         self._server_settings["signal"] = self.signal
         self._server_settings.pop("sock")
-        trigger_events(
-            self._server_settings.get("before_start", []), self.loop
+        self._await(self.app.callable._startup())
+        self._await(
+            self.app.callable._server_event("init", "before", loop=self.loop)
         )
-        self._server_settings["before_start"] = ()
 
         main_start = self._server_settings.pop("main_start", None)
         main_stop = self._server_settings.pop("main_stop", None)
@@ -82,24 +82,29 @@ class GunicornWorker(base.Worker):
                 "with GunicornWorker"
             )
 
-        self._runner = asyncio.ensure_future(self._run(), loop=self.loop)
         try:
-            self.loop.run_until_complete(self._runner)
+            self._await(self._run())
             self.app.callable.is_running = True
-            trigger_events(
-                self._server_settings.get("after_start", []), self.loop
+            self._await(
+                self.app.callable._server_event(
+                    "init", "after", loop=self.loop
+                )
             )
             self.loop.run_until_complete(self._check_alive())
-            trigger_events(
-                self._server_settings.get("before_stop", []), self.loop
+            self._await(
+                self.app.callable._server_event(
+                    "shutdown", "before", loop=self.loop
+                )
             )
             self.loop.run_until_complete(self.close())
         except BaseException:
             traceback.print_exc()
         finally:
             try:
-                trigger_events(
-                    self._server_settings.get("after_stop", []), self.loop
+                self._await(
+                    self.app.callable._server_event(
+                        "shutdown", "after", loop=self.loop
+                    )
                 )
             except BaseException:
                 traceback.print_exc()
@@ -137,14 +142,11 @@ class GunicornWorker(base.Worker):
 
             # Force close non-idle connection after waiting for
             # graceful_shutdown_timeout
-            coros = []
             for conn in self.connections:
                 if hasattr(conn, "websocket") and conn.websocket:
-                    coros.append(conn.websocket.close_connection())
+                    conn.websocket.fail_connection(code=1001)
                 else:
-                    conn.close()
-            _shutdown = asyncio.gather(*coros, loop=self.loop)
-            await _shutdown
+                    conn.abort()
 
     async def _run(self):
         for sock in self.sockets:
@@ -238,3 +240,7 @@ class GunicornWorker(base.Worker):
         self.exit_code = 1
         self.cfg.worker_abort(self)
         sys.exit(1)
+
+    def _await(self, coro):
+        fut = asyncio.ensure_future(coro, loop=self.loop)
+        self.loop.run_until_complete(fut)

setup.py

@@ -81,60 +81,63 @@ env_dependency = (
 )
 ujson = "ujson>=1.35" + env_dependency
 uvloop = "uvloop>=0.5.3" + env_dependency
-
+types_ujson = "types-ujson" + env_dependency
 requirements = [
-    "sanic-routing",
+    "sanic-routing~=0.7",
     "httptools>=0.0.10",
     uvloop,
     ujson,
     "aiofiles>=0.6.0",
-    "websockets>=8.1,<9.0",
+    "websockets>=10.0",
     "multidict>=5.0,<6.0",
 ]
 
 tests_require = [
-    "sanic-testing",
+    "sanic-testing>=0.7.0",
     "pytest==5.2.1",
-    "multidict>=5.0,<6.0",
+    "coverage==5.3",
     "gunicorn==20.0.4",
     "pytest-cov",
     "beautifulsoup4",
-    uvloop,
-    ujson,
     "pytest-sanic",
     "pytest-sugar",
     "pytest-benchmark",
+    "chardet==3.*",
+    "flake8",
+    "black",
+    "isort>=5.0.0",
+    "bandit",
+    "mypy>=0.901",
+    "docutils",
+    "pygments",
+    "uvicorn<0.15.0",
+    types_ujson,
 ]
 
 docs_require = [
     "sphinx>=2.1.2",
-    "sphinx_rtd_theme",
-    "recommonmark>=0.5.0",
+    "sphinx_rtd_theme>=0.4.3",
     "docutils",
     "pygments",
+    "m2r2",
 ]
 
 dev_require = tests_require + [
-    "aiofiles",
     "tox",
-    "black",
-    "flake8",
-    "bandit",
     "towncrier",
 ]
 
-all_require = dev_require + docs_require
+all_require = list(set(dev_require + docs_require))
 
 if strtobool(os.environ.get("SANIC_NO_UJSON", "no")):
     print("Installing without uJSON")
     requirements.remove(ujson)
-    tests_require.remove(ujson)
+    tests_require.remove(types_ujson)
 
 # 'nt' means windows OS
 if strtobool(os.environ.get("SANIC_NO_UVLOOP", "no")):
     print("Installing without uvLoop")
     requirements.remove(uvloop)
-    tests_require.remove(uvloop)
 
 extras_require = {
     "test": tests_require,

tests/conftest.py

@@ -1,3 +1,5 @@
+import asyncio
+import logging
 import random
 import re
 import string
@@ -9,12 +11,15 @@ from typing import Tuple
 import pytest
 
 from sanic_routing.exceptions import RouteExists
+from sanic_testing.testing import PORT
 
 from sanic import Sanic
 from sanic.constants import HTTP_METHODS
 from sanic.router import Router
+from sanic.touchup.service import TouchUp
 
 
+slugify = re.compile(r"[^a-zA-Z0-9_\-]")
 random.seed("Pack my box with five dozen liquor jugs.")
 Sanic.test_mode = True
 
@@ -22,11 +27,6 @@ if sys.platform in ["win32", "cygwin"]:
     collect_ignore = ["test_worker.py"]
 
 
-@pytest.fixture
-def caplog(caplog):
-    yield caplog
-
-
 async def _handler(request):
     """
     Dummy placeholder method used for route resolver when creating a new
@@ -40,33 +40,32 @@ async def _handler(request):
 
 
 TYPE_TO_GENERATOR_MAP = {
-    "string": lambda: "".join(
+    "str": lambda: "".join(
         [random.choice(string.ascii_lowercase) for _ in range(4)]
     ),
     "int": lambda: random.choice(range(1000000)),
-    "number": lambda: random.random(),
+    "float": lambda: random.random(),
     "alpha": lambda: "".join(
         [random.choice(string.ascii_lowercase) for _ in range(4)]
     ),
     "uuid": lambda: str(uuid.uuid1()),
 }
 
+CACHE = {}
+
 
 class RouteStringGenerator:
 
     ROUTE_COUNT_PER_DEPTH = 100
     HTTP_METHODS = HTTP_METHODS
-    ROUTE_PARAM_TYPES = ["string", "int", "number", "alpha", "uuid"]
+    ROUTE_PARAM_TYPES = ["str", "int", "float", "alpha", "uuid"]
 
     def generate_random_direct_route(self, max_route_depth=4):
         routes = []
         for depth in range(1, max_route_depth + 1):
             for _ in range(self.ROUTE_COUNT_PER_DEPTH):
                 route = "/".join(
-                    [
-                        TYPE_TO_GENERATOR_MAP.get("string")()
-                        for _ in range(depth)
-                    ]
+                    [TYPE_TO_GENERATOR_MAP.get("str")() for _ in range(depth)]
                 )
                 route = route.replace(".", "", -1)
                 route_detail = (random.choice(self.HTTP_METHODS), route)
@@ -82,7 +81,7 @@ class RouteStringGenerator:
             new_route_part = "/".join(
                 [
                     "<{}:{}>".format(
-                        TYPE_TO_GENERATOR_MAP.get("string")(),
+                        TYPE_TO_GENERATOR_MAP.get("str")(),
                         random.choice(self.ROUTE_PARAM_TYPES),
                     )
                     for _ in range(max_route_depth - current_length)
@@ -97,7 +96,7 @@ class RouteStringGenerator:
     def generate_url_for_template(template):
         url = template
         for pattern, param_type in re.findall(
-            re.compile(r"((?:<\w+:(string|int|number|alpha|uuid)>)+)"),
+            re.compile(r"((?:<\w+:(str|int|float|alpha|uuid)>)+)"),
             template,
         ):
             value = TYPE_TO_GENERATOR_MAP.get(param_type)()
@@ -110,6 +109,7 @@ def sanic_router(app):
     # noinspection PyProtectedMember
     def _setup(route_details: tuple) -> Tuple[Router, tuple]:
         router = Router()
+        router.ctx.app = app
         added_router = []
         for method, route in route_details:
             try:
@@ -140,5 +140,33 @@ def url_param_generator():
 
 @pytest.fixture(scope="function")
 def app(request):
-    app = Sanic(request.node.name)
-    return app
+    if not CACHE:
+        for target, method_name in TouchUp._registry:
+            CACHE[method_name] = getattr(target, method_name)
+    app = Sanic(slugify.sub("-", request.node.name))
+    yield app
+    for target, method_name in TouchUp._registry:
+        setattr(target, method_name, CACHE[method_name])
+
+
+@pytest.fixture(scope="function")
+def run_startup(caplog):
+    def run(app):
+        nonlocal caplog
+        loop = asyncio.new_event_loop()
+        asyncio.set_event_loop(loop)
+        with caplog.at_level(logging.DEBUG):
+            server = app.create_server(
+                debug=True, return_asyncio_server=True, port=PORT
+            )
+            loop._stopping = False
+
+            _server = loop.run_until_complete(server)
+
+            _server.close()
+            loop.run_until_complete(_server.wait_closed())
+            app.stop()
+
+        return caplog.record_tuples
+
+    return run

tests/fake/server.py

@@ -0,0 +1,36 @@
+import json
+import logging
+
+from sanic import Sanic, text
+from sanic.log import LOGGING_CONFIG_DEFAULTS, logger
+
+
+LOGGING_CONFIG = {**LOGGING_CONFIG_DEFAULTS}
+LOGGING_CONFIG["formatters"]["generic"]["format"] = "%(message)s"
+LOGGING_CONFIG["loggers"]["sanic.root"]["level"] = "DEBUG"
+
+app = Sanic(__name__, log_config=LOGGING_CONFIG)
+
+
+@app.get("/")
+async def handler(request):
+    return text(request.ip)
+
+
+@app.before_server_start
+async def app_info_dump(app: Sanic, _):
+    app_data = {
+        "access_log": app.config.ACCESS_LOG,
+        "auto_reload": app.auto_reload,
+        "debug": app.debug,
+    }
+    logger.info(json.dumps(app_data))
+
+
+@app.after_server_start
+async def shutdown(app: Sanic, _):
+    app.stop()
+
+
+def create_app():
+    return app

tests/test_app.py

@@ -9,6 +9,7 @@ from unittest.mock import Mock, patch
 import pytest
 
 from sanic import Sanic
+from sanic.config import Config
 from sanic.exceptions import SanicException
 from sanic.response import text
 
@@ -177,9 +178,6 @@ def test_app_enable_websocket(app, websocket_enabled, enable):
 @patch("sanic.app.WebSocketProtocol")
 def test_app_websocket_parameters(websocket_protocol_mock, app):
     app.config.WEBSOCKET_MAX_SIZE = 44
-    app.config.WEBSOCKET_MAX_QUEUE = 45
-    app.config.WEBSOCKET_READ_LIMIT = 46
-    app.config.WEBSOCKET_WRITE_LIMIT = 47
     app.config.WEBSOCKET_PING_TIMEOUT = 48
     app.config.WEBSOCKET_PING_INTERVAL = 50
 
@@ -196,11 +194,6 @@ def test_app_websocket_parameters(websocket_protocol_mock, app):
     websocket_protocol_call_args = websocket_protocol_mock.call_args
     ws_kwargs = websocket_protocol_call_args[1]
     assert ws_kwargs["websocket_max_size"] == app.config.WEBSOCKET_MAX_SIZE
-    assert ws_kwargs["websocket_max_queue"] == app.config.WEBSOCKET_MAX_QUEUE
-    assert ws_kwargs["websocket_read_limit"] == app.config.WEBSOCKET_READ_LIMIT
-    assert (
-        ws_kwargs["websocket_write_limit"] == app.config.WEBSOCKET_WRITE_LIMIT
-    )
     assert (
         ws_kwargs["websocket_ping_timeout"]
         == app.config.WEBSOCKET_PING_TIMEOUT
@@ -276,7 +269,7 @@ def test_handle_request_with_nested_sanic_exception(app, monkeypatch, caplog):
     assert response.status == 500
     assert "Mock SanicException" in response.text
     assert (
-        "sanic.root",
+        "sanic.error",
         logging.ERROR,
         f"Exception occurred while handling uri: 'http://127.0.0.1:{port}/'",
     ) in caplog.record_tuples
@@ -389,13 +382,13 @@ def test_app_no_registry_env():
 
 
 def test_app_set_attribute_warning(app):
-    with pytest.warns(UserWarning) as record:
+    with pytest.warns(DeprecationWarning) as record:
         app.foo = 1
 
     assert len(record) == 1
     assert record[0].message.args[0] == (
         "Setting variables on Sanic instances is deprecated "
-        "and will be removed in version 21.9. You should change your "
+        "and will be removed in version 21.12. You should change your "
         "Sanic instance to use instance.ctx.foo instead."
     )
 
@@ -412,3 +405,42 @@ def test_subclass_initialisation():
         pass
 
     CustomSanic("test_subclass_initialisation")
+
+
+def test_bad_custom_config():
+    with pytest.raises(
+        SanicException,
+        match=(
+            "When instantiating Sanic with config, you cannot also pass "
+            "load_env or env_prefix"
+        ),
+    ):
+        Sanic("test", config=1, load_env=1)
+    with pytest.raises(
+        SanicException,
+        match=(
+            "When instantiating Sanic with config, you cannot also pass "
+            "load_env or env_prefix"
+        ),
+    ):
+        Sanic("test", config=1, env_prefix=1)
+
+
+def test_custom_config():
+    class CustomConfig(Config):
+        ...
+
+    config = CustomConfig()
+    app = Sanic("custom", config=config)
+
+    assert app.config == config
+
+
+def test_custom_context():
+    class CustomContext:
+        ...
+
+    ctx = CustomContext()
+    app = Sanic("custom", ctx=ctx)
+
+    assert app.ctx == ctx

tests/test_asgi.py

@@ -1,5 +1,4 @@
 import asyncio
-import sys
 
 from collections import deque, namedtuple
 
@@ -8,10 +7,10 @@ import uvicorn
 
 from sanic import Sanic
 from sanic.asgi import MockTransport
-from sanic.exceptions import InvalidUsage
+from sanic.exceptions import Forbidden, InvalidUsage, ServiceUnavailable
 from sanic.request import Request
 from sanic.response import json, text
-from sanic.websocket import WebSocketConnection
+from sanic.server.websockets.connection import WebSocketConnection
 
 
 @pytest.fixture
@@ -219,7 +218,7 @@ async def test_websocket_accept_with_no_subprotocols(
 
     message = message_stack.popleft()
     assert message["type"] == "websocket.accept"
-    assert message["subprotocol"] == ""
+    assert message["subprotocol"] is None
     assert "bytes" not in message
 
 
@@ -228,7 +227,7 @@ async def test_websocket_accept_with_subprotocol(send, receive, message_stack):
     subprotocols = ["graphql-ws"]
 
     ws = WebSocketConnection(send, receive, subprotocols)
-    await ws.accept()
+    await ws.accept(subprotocols)
 
     assert len(message_stack) == 1
 
@@ -245,13 +244,13 @@ async def test_websocket_accept_with_multiple_subprotocols(
     subprotocols = ["graphql-ws", "hello", "world"]
 
     ws = WebSocketConnection(send, receive, subprotocols)
-    await ws.accept()
+    await ws.accept(["hello", "world"])
 
     assert len(message_stack) == 1
 
     message = message_stack.popleft()
     assert message["type"] == "websocket.accept"
-    assert message["subprotocol"] == "graphql-ws,hello,world"
+    assert message["subprotocol"] == "hello"
     assert "bytes" not in message
 
 
@@ -347,3 +346,33 @@ async def test_content_type(app):
 
     _, response = await app.asgi_client.get("/custom")
     assert response.headers.get("content-type") == "somethingelse"
+
+
+@pytest.mark.asyncio
+async def test_request_handle_exception(app):
+    @app.get("/error-prone")
+    def _request(request):
+        raise ServiceUnavailable(message="Service unavailable")
+
+    _, response = await app.asgi_client.get("/wrong-path")
+    assert response.status_code == 404
+
+    _, response = await app.asgi_client.get("/error-prone")
+    assert response.status_code == 503
+
+
+@pytest.mark.asyncio
+async def test_request_exception_suppressed_by_middleware(app):
+    @app.get("/error-prone")
+    def _request(request):
+        raise ServiceUnavailable(message="Service unavailable")
+
+    @app.on_request
+    def forbidden(request):
+        raise Forbidden(message="forbidden")
+
+    _, response = await app.asgi_client.get("/wrong-path")
+    assert response.status_code == 403
+
+    _, response = await app.asgi_client.get("/error-prone")
+    assert response.status_code == 403