Added the tests, code formatting changes, and the Range Request feature.

sanic/exceptions.py

@@ -1,8 +1,3 @@
-from .response import text, html
-from .log import log
-from traceback import format_exc, extract_tb
-import sys
-
 TRACEBACK_STYLE = '''
     <style>
         body {
@@ -104,6 +99,7 @@ INTERNAL_SERVER_ERROR_HTML = '''
 class SanicException(Exception):
     def __init__(self, message, status_code=None):
         super().__init__(message)
+
         if status_code is not None:
             self.status_code = status_code
 
@@ -137,68 +133,20 @@ class PayloadTooLarge(SanicException):
     status_code = 413
 
 
-class Handler:
-    handlers = None
+class HeaderNotFound(SanicException):
+    status_code = 400
 
-    def __init__(self):
-        self.handlers = {}
-        self.debug = False
 
-    def _render_traceback_html(self, exception, request):
-        exc_type, exc_value, tb = sys.exc_info()
-        frames = extract_tb(tb)
+class ContentRangeError(SanicException):
+    status_code = 416
 
-        frame_html = []
-        for frame in frames:
-            frame_html.append(TRACEBACK_LINE_HTML.format(frame))
+    def __init__(self, message, content_range):
+        super().__init__(message)
+        self.headers = {
+            'Content-Type': 'text/plain',
+            "Content-Range": "bytes */%s" % (content_range.total,)
+        }
 
-        return TRACEBACK_WRAPPER_HTML.format(
-            style=TRACEBACK_STYLE,
-            exc_name=exc_type.__name__,
-            exc_value=exc_value,
-            frame_html=''.join(frame_html),
-            uri=request.url)
 
-    def add(self, exception, handler):
-        self.handlers[exception] = handler
-
-    def response(self, request, exception):
-        """
-        Fetches and executes an exception handler and returns a response object
-
-        :param request: Request
-        :param exception: Exception to handle
-        :return: Response object
-        """
-        handler = self.handlers.get(type(exception), self.default)
-        try:
-            response = handler(request=request, exception=exception)
-        except:
-            log.error(format_exc())
-            if self.debug:
-                response_message = (
-                    'Exception raised in exception handler "{}" '
-                    'for uri: "{}"\n{}').format(
-                        handler.__name__, request.url, format_exc())
-                log.error(response_message)
-                return text(response_message, 500)
-            else:
-                return text('An error occurred while handling an error', 500)
-        return response
-
-    def default(self, request, exception):
-        log.error(format_exc())
-        if isinstance(exception, SanicException):
-            return text(
-                'Error: {}'.format(exception),
-                status=getattr(exception, 'status_code', 500))
-        elif self.debug:
-            html_output = self._render_traceback_html(exception, request)
-
-            response_message = (
-                'Exception occurred while handling uri: "{}"\n{}'.format(
-                    request.url, format_exc()))
-            log.error(response_message)
-            return html(html_output, status=500)
-        else:
-            return html(INTERNAL_SERVER_ERROR_HTML, status=500)
+class InvalidRangeType(ContentRangeError):
+    pass

sanic/handlers.py

@@ -0,0 +1,128 @@
+import sys
+from traceback import format_exc, extract_tb
+
+from .exceptions import ContentRangeError
+from .exceptions import INTERNAL_SERVER_ERROR_HTML, TRACEBACK_LINE_HTML
+from .exceptions import SanicException, HeaderNotFound, InvalidRangeType
+from .exceptions import TRACEBACK_STYLE, TRACEBACK_WRAPPER_HTML
+from .log import log
+from .response import text, html
+
+
+class ErrorHandler:
+    handlers = None
+
+    def __init__(self):
+        self.handlers = {}
+        self.debug = False
+
+    def _render_traceback_html(self, exception, request):
+        exc_type, exc_value, tb = sys.exc_info()
+        frames = extract_tb(tb)
+
+        frame_html = []
+        for frame in frames:
+            frame_html.append(TRACEBACK_LINE_HTML.format(frame))
+
+        return TRACEBACK_WRAPPER_HTML.format(
+            style=TRACEBACK_STYLE,
+            exc_name=exc_type.__name__,
+            exc_value=exc_value,
+            frame_html=''.join(frame_html),
+            uri=request.url)
+
+    def add(self, exception, handler):
+        self.handlers[exception] = handler
+
+    def response(self, request, exception):
+        """
+        Fetches and executes an exception handler and returns a response object
+
+        :param request: Request
+        :param exception: Exception to handle
+        :return: Response object
+        """
+        handler = self.handlers.get(type(exception), self.default)
+        try:
+            response = handler(request=request, exception=exception)
+        except Exception:
+            log.error(format_exc())
+            if self.debug:
+                response_message = (
+                    'Exception raised in exception handler "{}" '
+                    'for uri: "{}"\n{}').format(
+                        handler.__name__, request.url, format_exc())
+                log.error(response_message)
+                return text(response_message, 500)
+            else:
+                return text('An error occurred while handling an error', 500)
+        return response
+
+    def default(self, request, exception):
+        log.error(format_exc())
+        if issubclass(type(exception), SanicException):
+            return text(
+                'Error: {}'.format(exception),
+                status=getattr(exception, 'status_code', 500),
+                headers=getattr(exception, 'headers', dict())
+            )
+        elif self.debug:
+            html_output = self._render_traceback_html(exception, request)
+
+            response_message = (
+                'Exception occurred while handling uri: "{}"\n{}'.format(
+                    request.url, format_exc()))
+            log.error(response_message)
+            return html(html_output, status=500)
+        else:
+            return html(INTERNAL_SERVER_ERROR_HTML, status=500)
+
+
+class ContentRangeHandler:
+    """
+    This class is for parsing the request header
+    """
+    __slots__ = ('start', 'end', 'size', 'total', 'headers')
+
+    def __init__(self, request, stats):
+        self.total = stats.st_size
+        _range = request.headers.get('Range')
+        if _range is None:
+            raise HeaderNotFound('Range Header Not Found')
+        unit, _, value = tuple(map(str.strip, _range.partition('=')))
+        if unit != 'bytes':
+            raise InvalidRangeType(
+                '%s is not a valid Range Type' % (unit,), self)
+        start_b, _, end_b = tuple(map(str.strip, value.partition('-')))
+        try:
+            self.start = int(start_b) if start_b else None
+        except ValueError:
+            raise ContentRangeError(
+                '\'%s\' is invalid for Content Range' % (start_b,), self)
+        try:
+            self.end = int(end_b) if end_b else None
+        except ValueError:
+            raise ContentRangeError(
+                '\'%s\' is invalid for Content Range' % (end_b,), self)
+        if self.end is None:
+            if self.start is None:
+                raise ContentRangeError(
+                    'Invalid for Content Range parameters', self)
+            else:
+                # this case represents `Content-Range: bytes 5-`
+                self.end = self.total
+        else:
+            if self.start is None:
+                # this case represents `Content-Range: bytes -5`
+                self.start = self.total - self.end
+                self.end = self.total
+        if self.start >= self.end:
+            raise ContentRangeError(
+                'Invalid for Content Range parameters', self)
+        self.size = self.end - self.start
+        self.headers = {
+            'Content-Range': "bytes %s-%s/%s" % (
+                self.start, self.end, self.total)}
+
+    def __bool__(self):
+        return self.size > 0

sanic/response.py

@@ -1,9 +1,10 @@
-from aiofiles import open as open_async
+from collections import ChainMap
 from mimetypes import guess_type
 from os import path
-
 from ujson import dumps as json_dumps
 
+from aiofiles import open as open_async
+
 from .cookies import CookieJar
 
 COMMON_STATUS_CODES = {
@@ -97,21 +98,25 @@ class HTTPResponse:
     def output(self, version="1.1", keep_alive=False, keep_alive_timeout=None):
         # This is all returned in a kind-of funky way
         # We tried to make this as fast as possible in pure python
-        timeout_header = b''
-        if keep_alive and keep_alive_timeout:
-            timeout_header = b'Keep-Alive: timeout=%d\r\n' % keep_alive_timeout
-
+        default_header = dict()
+        if keep_alive:
+            if keep_alive_timeout:
+                default_header['Keep-Alive'] = keep_alive_timeout
+            default_header['Connection'] = 'keep-alive'
+        else:
+            default_header['Connection'] = 'close'
+        default_header['Content-Length'] = len(self.body)
+        default_header['Content-Type'] = self.content_type
         headers = b''
-        if self.headers:
-            for name, value in self.headers.items():
-                try:
-                    headers += (
-                        b'%b: %b\r\n' % (name.encode(), value.encode('utf-8')))
-                except AttributeError:
-                    headers += (
-                        b'%b: %b\r\n' % (
-                            str(name).encode(), str(value).encode('utf-8')))
-
+        for name, value in ChainMap(self.headers, default_header).items():
+            try:
+                headers += (
+                    b'%b: %b\r\n' % (
+                        name.encode(), value.encode('utf-8')))
+            except AttributeError:
+                headers += (
+                    b'%b: %b\r\n' % (
+                        str(name).encode(), str(value).encode('utf-8')))
         # Try to pull from the common codes first
         # Speeds up response rate 6% over pulling from all
         status = COMMON_STATUS_CODES.get(self.status)
@@ -119,18 +124,11 @@ class HTTPResponse:
             status = ALL_STATUS_CODES.get(self.status)
 
         return (b'HTTP/%b %d %b\r\n'
-                b'Content-Type: %b\r\n'
-                b'Content-Length: %d\r\n'
-                b'Connection: %b\r\n'
-                b'%b%b\r\n'
+                b'%b\r\n'
                 b'%b') % (
             version.encode(),
             self.status,
             status,
-            self.content_type.encode(),
-            len(self.body),
-            b'keep-alive' if keep_alive else b'close',
-            timeout_header,
             headers,
             self.body
         )
@@ -148,7 +146,7 @@ def json(body, status=200, headers=None, **kwargs):
     :param body: Response data to be serialized.
     :param status: Response code.
     :param headers: Custom Headers.
-    :param \**kwargs: Remaining arguments that are passed to the json encoder.
+    :param kwargs: Remaining arguments that are passed to the json encoder.
     """
     return HTTPResponse(json_dumps(body, **kwargs), headers=headers,
                         status=status, content_type="application/json")
@@ -176,17 +174,24 @@ def html(body, status=200, headers=None):
                         content_type="text/html; charset=utf-8")
 
 
-async def file(location, mime_type=None, headers=None):
+async def file(location, mime_type=None, headers=None, _range=None):
     """
     Returns response object with file data.
     :param location: Location of file on system.
     :param mime_type: Specific mime_type.
     :param headers: Custom Headers.
+    :param _range:
     """
     filename = path.split(location)[-1]
 
     async with open_async(location, mode='rb') as _file:
-        out_stream = await _file.read()
+        if _range:
+            await _file.seek(_range.start)
+            out_stream = await _file.read(_range.size)
+            headers['Content-Range'] = 'bytes %s-%s/%s' % (
+                _range.start, _range.end, _range.total)
+        else:
+            out_stream = await _file.read()
 
     mime_type = mime_type or guess_type(filename)[0] or 'text/plain'
 

sanic/sanic.py

@@ -1,15 +1,15 @@
 import logging
+import warnings
 from asyncio import get_event_loop
 from collections import deque
 from functools import partial
 from inspect import isawaitable, stack, getmodulename
 from traceback import format_exc
-import warnings
 
 from .config import Config
 from .constants import HTTP_METHODS
-from .exceptions import Handler
 from .exceptions import ServerError
+from .handlers import ErrorHandler
 from .log import log
 from .response import HTTPResponse
 from .router import Router
@@ -34,7 +34,7 @@ class Sanic:
             name = getmodulename(frame_records[1])
         self.name = name
         self.router = router or Router()
-        self.error_handler = error_handler or Handler()
+        self.error_handler = error_handler or ErrorHandler()
         self.config = Config()
         self.request_middleware = deque()
         self.response_middleware = deque()
@@ -58,6 +58,7 @@ class Sanic:
 
         :param uri: path of the URL
         :param methods: list or tuple of methods allowed
+        :param host:
         :return: decorated function
         """
 
@@ -75,25 +76,25 @@ class Sanic:
 
     # Shorthand method decorators
     def get(self, uri, host=None):
-        return self.route(uri, methods=["GET"], host=host)
+        return self.route(uri, methods=frozenset({"GET"}), host=host)
 
     def post(self, uri, host=None):
-        return self.route(uri, methods=["POST"], host=host)
+        return self.route(uri, methods=frozenset({"POST"}), host=host)
 
     def put(self, uri, host=None):
-        return self.route(uri, methods=["PUT"], host=host)
+        return self.route(uri, methods=frozenset({"PUT"}), host=host)
 
     def head(self, uri, host=None):
-        return self.route(uri, methods=["HEAD"], host=host)
+        return self.route(uri, methods=frozenset({"HEAD"}), host=host)
 
     def options(self, uri, host=None):
-        return self.route(uri, methods=["OPTIONS"], host=host)
+        return self.route(uri, methods=frozenset({"OPTIONS"}), host=host)
 
     def patch(self, uri, host=None):
-        return self.route(uri, methods=["PATCH"], host=host)
+        return self.route(uri, methods=frozenset({"PATCH"}), host=host)
 
     def delete(self, uri, host=None):
-        return self.route(uri, methods=["DELETE"], host=host)
+        return self.route(uri, methods=frozenset({"DELETE"}), host=host)
 
     def add_route(self, handler, uri, methods=frozenset({'GET'}), host=None):
         """
@@ -105,6 +106,7 @@ class Sanic:
         :param uri: path of the URL
         :param methods: list or tuple of methods allowed, these are overridden
                         if using a HTTPMethodView
+        :param host:
         :return: function or class instance
         """
         # Handle HTTPMethodView differently
@@ -121,7 +123,7 @@ class Sanic:
         """
         Decorates a function to be registered as a handler for exceptions
 
-        :param \*exceptions: exceptions
+        :param exceptions: exceptions
         :return: decorated function
         """
 
@@ -156,13 +158,13 @@ class Sanic:
 
     # Static Files
     def static(self, uri, file_or_directory, pattern='.+',
-               use_modified_since=True):
+               use_modified_since=True, use_content_range=False):
         """
         Registers a root to serve files from.  The input can either be a file
         or a directory.  See
         """
         static_register(self, uri, file_or_directory, pattern,
-                        use_modified_since)
+                        use_modified_since, use_content_range)
 
     def blueprint(self, blueprint, **options):
         """
@@ -303,6 +305,10 @@ class Sanic:
         :param sock: Socket for the server to accept connections from
         :param workers: Number of processes
                         received before it is respected
+        :param loop:
+        :param backlog:
+        :param stop_event:
+        :param register_sys_signals:
         :param protocol: Subclass of asyncio protocol class
         :return: Nothing
         """
@@ -317,11 +323,9 @@ class Sanic:
                 serve(**server_settings)
             else:
                 serve_multiple(server_settings, workers, stop_event)
-
         except Exception as e:
             log.exception(
                 'Experienced exception while trying to serve')
-
         log.info("Server Stopped")
 
     def stop(self):
@@ -341,7 +345,7 @@ class Sanic:
             after_start=after_start, before_stop=before_stop,
             after_stop=after_stop, ssl=ssl, sock=sock, loop=loop,
             protocol=protocol, backlog=backlog, stop_event=stop_event,
-            async_run=True)
+            run_async=True)
 
         # Serve
         proto = "http"
@@ -397,7 +401,7 @@ class Sanic:
                 ("after_server_start", "after_start", after_start, False),
                 ("before_server_stop", "before_stop", before_stop, True),
                 ("after_server_stop", "after_stop", after_stop, True),
-                ):
+        ):
             listeners = []
             for blueprint in self.blueprints.values():
                 listeners += blueprint.listeners[event_name]

sanic/static.py

@@ -1,15 +1,20 @@
-from aiofiles.os import stat
+from mimetypes import guess_type
 from os import path
 from re import sub
 from time import strftime, gmtime
 from urllib.parse import unquote
 
-from .exceptions import FileNotFound, InvalidUsage
+from aiofiles.os import stat
+
+from .exceptions import FileNotFound, InvalidUsage, ContentRangeError
+from .exceptions import HeaderNotFound
+from .handlers import ContentRangeHandler
 from .response import file, HTTPResponse
 
 
-def register(app, uri, file_or_directory, pattern, use_modified_since):
-    # TODO: Though sanic is not a file server, I feel like we should atleast
+def register(app, uri, file_or_directory, pattern,
+             use_modified_since, use_content_range):
+    # TODO: Though sanic is not a file server, I feel like we should at least
     #       make a good effort here.  Modified-since is nice, but we could
     #       also look into etags, expires, and caching
     """
@@ -23,8 +28,9 @@ def register(app, uri, file_or_directory, pattern, use_modified_since):
     :param use_modified_since: If true, send file modified time, and return
                                not modified if the browser's matches the
                                server's
+    :param use_content_range: If true, process header for range requests
+                              and sends the file part that is requested
     """
-
     # If we're not trying to match a file directly,
     # serve from the folder
     if not path.isfile(file_or_directory):
@@ -50,18 +56,41 @@ def register(app, uri, file_or_directory, pattern, use_modified_since):
             headers = {}
             # Check if the client has been sent this file before
             # and it has not been modified since
+            stats = None
             if use_modified_since:
                 stats = await stat(file_path)
-                modified_since = strftime('%a, %d %b %Y %H:%M:%S GMT',
-                                          gmtime(stats.st_mtime))
+                modified_since = strftime(
+                    '%a, %d %b %Y %H:%M:%S GMT', gmtime(stats.st_mtime))
                 if request.headers.get('If-Modified-Since') == modified_since:
                     return HTTPResponse(status=304)
                 headers['Last-Modified'] = modified_since
-
-            return await file(file_path, headers=headers)
-        except:
+            _range = None
+            if use_content_range:
+                _range = None
+                if not stats:
+                    stats = await stat(file_path)
+                headers['Accept-Ranges'] = 'bytes'
+                headers['Content-Length'] = str(stats.st_size)
+                if request.method != 'HEAD':
+                    try:
+                        _range = ContentRangeHandler(request, stats)
+                    except HeaderNotFound:
+                        pass
+                    else:
+                        del headers['Content-Length']
+                        for key, value in _range.headers.items():
+                            headers[key] = value
+            if request.method == 'HEAD':
+                return HTTPResponse(
+                    headers=headers,
+                    content_type=guess_type(file_path)[0] or 'text/plain')
+            else:
+                return await file(file_path, headers=headers, _range=_range)
+        except ContentRangeError:
+            raise
+        except Exception:
             raise FileNotFound('File not found',
                                path=file_or_directory,
                                relative_url=file_uri)
 
-    app.route(uri, methods=['GET'])(_handler)
+    app.route(uri, methods=['GET', 'HEAD'])(_handler)

tests/test_requests.py

@@ -1,11 +1,13 @@
 from json import loads as json_loads, dumps as json_dumps
-from sanic import Sanic
-from sanic.response import json, text, redirect
-from sanic.utils import sanic_endpoint_test
-from sanic.exceptions import ServerError
 
 import pytest
 
+from sanic import Sanic
+from sanic.exceptions import ServerError
+from sanic.response import json, text, redirect
+from sanic.utils import sanic_endpoint_test
+
+
 # ------------------------------------------------------------ #
 #  GET
 # ------------------------------------------------------------ #
@@ -112,7 +114,8 @@ def test_query_string():
     async def handler(request):
         return text('OK')
 
-    request, response = sanic_endpoint_test(app, params=[("test1", "1"), ("test2", "false"), ("test2", "true")])
+    request, response = sanic_endpoint_test(
+        app, params=[("test1", "1"), ("test2", "false"), ("test2", "true")])
 
     assert request.args.get('test1') == '1'
     assert request.args.get('test2') == 'false'
@@ -150,7 +153,8 @@ def test_post_json():
     payload = {'test': 'OK'}
     headers = {'content-type': 'application/json'}
 
-    request, response = sanic_endpoint_test(app, data=json_dumps(payload), headers=headers)
+    request, response = sanic_endpoint_test(
+        app, data=json_dumps(payload), headers=headers)
 
     assert request.json.get('test') == 'OK'
     assert response.text == 'OK'

tests/test_static.py

@@ -60,3 +60,94 @@ def test_static_url_decode_file(static_file_directory):
     request, response = sanic_endpoint_test(app, uri='/dir/decode me.txt')
     assert response.status == 200
     assert response.body == decode_me_contents
+
+
+def test_static_head_request(static_file_path, static_file_content):
+    app = Sanic('test_static')
+    app.static('/testing.file', static_file_path, use_content_range=True)
+
+    request, response = sanic_endpoint_test(
+        app, uri='/testing.file', method='head')
+    assert response.status == 200
+    assert 'Accept-Ranges' in response.headers
+    assert 'Content-Length' in response.headers
+    assert int(response.headers['Content-Length']) == len(static_file_content)
+
+
+def test_static_content_range_correct(static_file_path, static_file_content):
+    app = Sanic('test_static')
+    app.static('/testing.file', static_file_path, use_content_range=True)
+
+    headers = {
+        'Range': 'bytes=12-19'
+    }
+    request, response = sanic_endpoint_test(
+        app, uri='/testing.file', headers=headers)
+    assert response.status == 200
+    assert 'Content-Length' in response.headers
+    assert 'Content-Range' in response.headers
+    static_content = bytes(static_file_content)[12:19]
+    assert int(response.headers['Content-Length']) == len(static_content)
+    assert response.body == static_content
+
+
+def test_static_content_range_front(static_file_path, static_file_content):
+    app = Sanic('test_static')
+    app.static('/testing.file', static_file_path, use_content_range=True)
+
+    headers = {
+        'Range': 'bytes=12-'
+    }
+    request, response = sanic_endpoint_test(
+        app, uri='/testing.file', headers=headers)
+    assert response.status == 200
+    assert 'Content-Length' in response.headers
+    assert 'Content-Range' in response.headers
+    static_content = bytes(static_file_content)[12:]
+    assert int(response.headers['Content-Length']) == len(static_content)
+    assert response.body == static_content
+
+
+def test_static_content_range_back(static_file_path, static_file_content):
+    app = Sanic('test_static')
+    app.static('/testing.file', static_file_path, use_content_range=True)
+
+    headers = {
+        'Range': 'bytes=-12'
+    }
+    request, response = sanic_endpoint_test(
+        app, uri='/testing.file', headers=headers)
+    assert response.status == 200
+    assert 'Content-Length' in response.headers
+    assert 'Content-Range' in response.headers
+    static_content = bytes(static_file_content)[-12:]
+    assert int(response.headers['Content-Length']) == len(static_content)
+    assert response.body == static_content
+
+
+def test_static_content_range_empty(static_file_path, static_file_content):
+    app = Sanic('test_static')
+    app.static('/testing.file', static_file_path, use_content_range=True)
+
+    request, response = sanic_endpoint_test(app, uri='/testing.file')
+    assert response.status == 200
+    assert 'Content-Length' in response.headers
+    assert 'Content-Range' not in response.headers
+    assert int(response.headers['Content-Length']) == len(static_file_content)
+    assert response.body == bytes(static_file_content)
+
+
+def test_static_content_range_error(static_file_path, static_file_content):
+    app = Sanic('test_static')
+    app.static('/testing.file', static_file_path, use_content_range=True)
+
+    headers = {
+        'Range': 'bytes=1-0'
+    }
+    request, response = sanic_endpoint_test(
+        app, uri='/testing.file', headers=headers)
+    assert response.status == 416
+    assert 'Content-Length' in response.headers
+    assert 'Content-Range' in response.headers
+    assert response.headers['Content-Range'] == "bytes */%s" % (
+        len(static_file_content),)