Finish moving some more logic to mixins

sanic/app.py

@@ -23,6 +23,7 @@ from sanic.blueprints import Blueprint
 from sanic.config import BASE_LOGO, Config
 from sanic.constants import HTTP_METHODS
 from sanic.exceptions import (
+    InvalidUsage,
     NotFound,
     SanicException,
     ServerError,
@@ -31,9 +32,17 @@ from sanic.exceptions import (
 from sanic.handlers import ErrorHandler, ListenerType, MiddlewareType
 from sanic.log import LOGGING_CONFIG_DEFAULTS, error_logger, logger
 from sanic.mixins.base import BaseMixin
+from sanic.mixins.exceptions import ExceptionMixin
+from sanic.mixins.listeners import ListenerEvent, ListenerMixin
 from sanic.mixins.middleware import MiddlewareMixin
 from sanic.mixins.routes import RouteMixin
-from sanic.models.futures import FutureMiddleware, FutureRoute, FutureStatic
+from sanic.models.futures import (
+    FutureException,
+    FutureListener,
+    FutureMiddleware,
+    FutureRoute,
+    FutureStatic,
+)
 from sanic.request import Request
 from sanic.response import BaseHTTPResponse, HTTPResponse
 from sanic.router import Router
@@ -49,7 +58,9 @@ from sanic.views import CompositionView
 from sanic.websocket import ConnectionClosed, WebSocketProtocol
 
 
-class Sanic(BaseMixin, RouteMixin, MiddlewareMixin):
+class Sanic(
+    BaseMixin, RouteMixin, MiddlewareMixin, ListenerMixin, ExceptionMixin
+):
     _app_registry: Dict[str, "Sanic"] = {}
     test_mode = False
 
@@ -144,17 +155,8 @@ class Sanic(BaseMixin, RouteMixin, MiddlewareMixin):
             )
 
     # Decorator
-    def listener(self, event):
-        """Create a listener from a decorated function.
-
-        :param event: event to listen to
-        """
-
-        def decorator(listener):
-            self.listeners[event].append(listener)
-            return listener
-
-        return decorator
+    def _apply_listener(self, listener: FutureListener):
+        return self.register_listener(listener.listener, listener.event)
 
     def register_listener(self, listener, event):
         """
@@ -165,7 +167,14 @@ class Sanic(BaseMixin, RouteMixin, MiddlewareMixin):
         :return: listener
         """
 
-        return self.listener(event)(listener)
+        try:
+            _event = ListenerEvent(event)
+        except ValueError:
+            valid = ", ".join(ListenerEvent.__members__.values())
+            raise InvalidUsage(f"Invalid event: {event}. Use one of: {valid}")
+
+        self.listeners[_event].append(listener)
+        return listener
 
     def _apply_route(self, route: FutureRoute) -> Route:
         return self.router.add(**route._asdict())
@@ -187,23 +196,20 @@ class Sanic(BaseMixin, RouteMixin, MiddlewareMixin):
         self.websocket_enabled = enable
 
     # Decorator
-    def exception(self, *exceptions):
+    def _apply_exception_handler(self, handler: FutureException):
         """Decorate a function to be registered as a handler for exceptions
 
         :param exceptions: exceptions
         :return: decorated function
         """
 
-        def response(handler):
-            for exception in exceptions:
-                if isinstance(exception, (tuple, list)):
-                    for e in exception:
-                        self.error_handler.add(e, handler)
-                else:
-                    self.error_handler.add(exception, handler)
-            return handler
-
-        return response
+        for exception in handler.exceptions:
+            if isinstance(exception, (tuple, list)):
+                for e in exception:
+                    self.error_handler.add(e, handler.handler)
+            else:
+                self.error_handler.add(exception, handler.handler)
+        return handler
 
     def register_middleware(self, middleware, attach_to="request"):
         """

sanic/blueprints.py

@@ -1,21 +1,17 @@
-from collections import defaultdict, namedtuple
+from collections import defaultdict
 
 from sanic.blueprint_group import BlueprintGroup
-from sanic.constants import HTTP_METHODS
 from sanic.mixins.base import BaseMixin
+from sanic.mixins.exceptions import ExceptionMixin
+from sanic.mixins.listeners import ListenerMixin
 from sanic.mixins.middleware import MiddlewareMixin
 from sanic.mixins.routes import RouteMixin
-from sanic.models.futures import (
-    FutureException,
-    FutureListener,
-    FutureMiddleware,
-    FutureRoute,
-    FutureStatic,
-)
-from sanic.views import CompositionView
+from sanic.models.futures import FutureRoute, FutureStatic
 
 
-class Blueprint(BaseMixin, RouteMixin, MiddlewareMixin):
+class Blueprint(
+    BaseMixin, RouteMixin, MiddlewareMixin, ListenerMixin, ExceptionMixin
+):
     def __init__(
         self,
         name,
@@ -61,6 +57,14 @@ class Blueprint(BaseMixin, RouteMixin, MiddlewareMixin):
         kwargs["apply"] = False
         return super().middleware(*args, **kwargs)
 
+    def listener(self, *args, **kwargs):
+        kwargs["apply"] = False
+        return super().listener(*args, **kwargs)
+
+    def exception(self, *args, **kwargs):
+        kwargs["apply"] = False
+        return super().exception(*args, **kwargs)
+
     @staticmethod
     def group(*blueprints, url_prefix=""):
         """
@@ -103,9 +107,6 @@ class Blueprint(BaseMixin, RouteMixin, MiddlewareMixin):
 
         routes = []
 
-        # TODO:
-        # - Add BP name to handler name for all routes
-
         # Routes
         for future in self._future_routes:
             # attach the blueprint name to the handler so that it can be
@@ -144,45 +145,12 @@ class Blueprint(BaseMixin, RouteMixin, MiddlewareMixin):
             app._apply_middleware(future, route_names)
 
         # Exceptions
-        for future in self.exceptions:
-            app.exception(*future.args, **future.kwargs)(future.handler)
+        for future in self._future_exceptions:
+            app._apply_exception_handler(future)
 
         # Event listeners
-        for event, listeners in self.listeners.items():
-            for listener in listeners:
-                app.listener(event)(listener)
-
-    def listener(self, event):
-        """Create a listener from a decorated function.
-
-        :param event: Event to listen to.
-        """
-
-        def decorator(listener):
-            self.listeners[event].append(listener)
-            return listener
-
-        return decorator
-
-    def exception(self, *args, **kwargs):
-        """
-        This method enables the process of creating a global exception
-        handler for the current blueprint under question.
-
-        :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
-            route registered under this blueprint.
-        """
-
-        def decorator(handler):
-            exception = FutureException(handler, args, kwargs)
-            self.exceptions.append(exception)
-            return handler
-
-        return decorator
+        for listener in self._future_listeners:
+            app._apply_listener(listener)
 
     def _generate_name(self, handler, name: str) -> str:
         return f"{self.name}.{name or handler.__name__}"

sanic/mixins/exceptions.py

@@ -0,0 +1,38 @@
+from enum import Enum, auto
+from functools import partial
+from typing import Set
+
+from sanic.models.futures import FutureException
+
+
+class ExceptionMixin:
+    def __init__(self, *args, **kwargs) -> None:
+        self._future_exceptions: Set[FutureException] = set()
+
+    def _apply_exception_handler(self, handler: FutureException):
+        raise NotImplementedError
+
+    def exception(self, *exceptions, apply=True):
+        """
+        This method enables the process of creating a global exception
+        handler for the current blueprint under question.
+
+        :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
+            route registered under this blueprint.
+        """
+
+        def decorator(handler):
+            nonlocal apply
+            nonlocal exceptions
+
+            future_exception = FutureException(handler, exceptions)
+            self._future_exceptions.add(future_exception)
+            if apply:
+                self._apply_exception_handler(future_exception)
+            return handler
+
+        return decorator

sanic/mixins/listeners.py

@@ -0,0 +1,55 @@
+from enum import Enum, auto
+from functools import partial
+from typing import Set
+
+from sanic.models.futures import FutureListener
+
+
+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()
+
+
+class ListenerMixin:
+    def __init__(self, *args, **kwargs) -> None:
+        self._future_listeners: Set[FutureListener] = set()
+
+    def _apply_listener(self, listener: FutureListener):
+        raise NotImplementedError
+
+    def listener(self, listener_or_event, event_or_none=None, apply=True):
+        """Create a listener from a decorated function.
+
+        :param event: Event to listen to.
+        """
+
+        def register_listener(listener, event):
+            nonlocal apply
+
+            future_listener = FutureListener(listener, event)
+            self._future_listeners.add(future_listener)
+            if apply:
+                self._apply_listener(future_listener)
+            return listener
+
+        if callable(listener_or_event):
+            return register_listener(listener_or_event, event_or_none)
+        else:
+            return partial(register_listener, event=listener_or_event)
+
+    def before_server_start(self, listener):
+        return self.listener(listener, "before_server_start")
+
+    def after_server_start(self, listener):
+        return self.listener(listener, "after_server_start")
+
+    def before_server_stop(self, listener):
+        return self.listener(listener, "before_server_stop")
+
+    def after_server_stop(self, listener):
+        return self.listener(listener, "after_server_stop")

sanic/mixins/middleware.py

@@ -23,12 +23,14 @@ class MiddlewareMixin:
             identifying which type of middleware is being registered.
         """
 
-        def register_middleware(_middleware, attach_to="request"):
-            future_middleware = FutureMiddleware(_middleware, attach_to)
+        def register_middleware(middleware, attach_to="request"):
+            nonlocal apply
+
+            future_middleware = FutureMiddleware(middleware, attach_to)
             self._future_middleware.add(future_middleware)
             if apply:
                 self._apply_middleware(future_middleware)
-            return _middleware
+            return middleware
 
         # Detect which way this was called, @middleware or @middleware('AT')
         if callable(middleware_or_request):
@@ -39,3 +41,9 @@ class MiddlewareMixin:
             return partial(
                 register_middleware, attach_to=middleware_or_request
             )
+
+    def on_request(self, middleware):
+        return self.middleware(middleware, "request")
+
+    def on_response(self, middleware):
+        return self.middleware(middleware, "response")

sanic/mixins/routes.py

@@ -1,9 +1,7 @@
 from functools import partial
 from inspect import signature
 from pathlib import PurePath
-from typing import List, Set, Union
-
-import websockets
+from typing import Set, Union
 
 from sanic_routing.route import Route
 

sanic/models/futures.py

@@ -15,11 +15,9 @@ FutureRoute = namedtuple(
         "ignore_body",
     ],
 )
-FutureListener = namedtuple(
-    "FutureListener", ["handler", "uri", "methods", "host"]
-)
+FutureListener = namedtuple("FutureListener", ["listener", "event"])
 FutureMiddleware = namedtuple("FutureMiddleware", ["middleware", "attach_to"])
-FutureException = namedtuple("FutureException", ["handler", "args", "kwargs"])
+FutureException = namedtuple("FutureException", ["handler", "exceptions"])
 FutureStatic = namedtuple(
     "FutureStatic",
     [

sanic/router.py

@@ -4,7 +4,6 @@ from sanic_routing import BaseRouter
 from sanic_routing.route import Route
 
 from sanic.constants import HTTP_METHODS
-from sanic.log import logger
 from sanic.request import Request
 
 

sanic/static.py

@@ -4,7 +4,6 @@ from os import path
 from pathlib import PurePath
 from re import sub
 from time import gmtime, strftime
-from typing import Union
 from urllib.parse import unquote
 
 from sanic.compat import stat_async