Updated to use ASGI v3 applications internally. (#275)

Used guarantee_single_callable().
Removed unneeded --asgi-protocol CLI option.
Updated tests.

Co-authored-by: Carlton Gibson <carlton.gibson@noumenal.es>

daphne/cli.py

@@ -1,10 +1,9 @@
 import argparse
-import functools
 import logging
 import sys
 from argparse import ArgumentError, Namespace
 
-from asgiref.compatibility import is_double_callable
+from asgiref.compatibility import guarantee_single_callable
 
 from .access import AccessLogGenerator
 from .endpoints import build_endpoint_description_strings
@@ -17,19 +16,6 @@ DEFAULT_HOST = "127.0.0.1"
 DEFAULT_PORT = 8000
 
 
-class ASGI3Middleware:
-    def __init__(self, app):
-        self.app = app
-
-    def __call__(self, scope):
-        scope.setdefault("asgi", {})
-        scope["asgi"]["version"] = "3.0"
-        return functools.partial(self.asgi, scope=scope)
-
-    async def asgi(self, receive, send, scope):
-        await self.app(scope, receive, send)
-
-
 class CommandLineInterface(object):
     """
     Acts as the main CLI entry point for running the server.
@@ -129,13 +115,6 @@ class CommandLineInterface(object):
             help="The WebSocket protocols you wish to support",
             default=None,
         )
-        self.parser.add_argument(
-            "--asgi-protocol",
-            dest="asgi_protocol",
-            help="The version of the ASGI protocol to use",
-            default="auto",
-            choices=["asgi2", "asgi3", "auto"],
-        )
         self.parser.add_argument(
             "--root-path",
             dest="root_path",
@@ -247,16 +226,11 @@ class CommandLineInterface(object):
                 access_log_stream = open(args.access_log, "a", 1)
         elif args.verbosity >= 1:
             access_log_stream = sys.stdout
+
         # Import application
         sys.path.insert(0, ".")
         application = import_by_path(args.application)
-
-        asgi_protocol = args.asgi_protocol
-        if asgi_protocol == "auto":
-            asgi_protocol = "asgi2" if is_double_callable(application) else "asgi3"
-
-        if asgi_protocol == "asgi3":
-            application = ASGI3Middleware(application)
+        application = guarantee_single_callable(application)
 
         # Set up port/host bindings
         if not any(

daphne/server.py

@@ -199,15 +199,17 @@ class Server(object):
         assert "application_instance" not in self.connections[protocol]
         # Make an instance of the application
         input_queue = asyncio.Queue()
-        application_instance = self.application(scope=scope)
+        scope.setdefault("asgi", {"version": "3.0"})
+        application_instance = self.application(
+            scope=scope,
+            receive=input_queue.get,
+            send=lambda message: self.handle_reply(protocol, message),
+        )
         # Run it, and stash the future for later checking
         if protocol not in self.connections:
             return None
         self.connections[protocol]["application_instance"] = asyncio.ensure_future(
-            application_instance(
-                receive=input_queue.get,
-                send=lambda message: self.handle_reply(protocol, message),
-            ),
+            application_instance,
             loop=asyncio.get_event_loop(),
         )
         return input_queue

daphne/testing.py

@@ -5,7 +5,6 @@ import pickle
 import tempfile
 import traceback
 from concurrent.futures import CancelledError
-from functools import partial
 
 
 class DaphneTestingInstance:
@@ -43,7 +42,7 @@ class DaphneTestingInstance:
         # Start up process
         self.process = DaphneProcess(
             host=self.host,
-            application=partial(TestApplication, lock=self.lock),
+            application=TestApplication(lock=self.lock),
             kwargs=kwargs,
             setup=self.process_setup,
             teardown=self.process_teardown,
@@ -173,12 +172,12 @@ class TestApplication:
     setup_storage = os.path.join(tempfile.gettempdir(), "setup.testio")
     result_storage = os.path.join(tempfile.gettempdir(), "result.testio")
 
-    def __init__(self, scope, lock):
-        self.scope = scope
+    def __init__(self, lock):
         self.lock = lock
         self.messages = []
 
-    async def __call__(self, send, receive):
+    async def __call__(self, scope, receive, send):
+        self.scope = scope
         # Receive input and send output
         logging.debug("test app coroutine alive")
         try:

tests/test_http_request.py

@@ -24,6 +24,7 @@ class TestHTTPRequest(DaphneTestCase):
         # Check overall keys
         self.assert_key_sets(
             required_keys={
+                "asgi",
                 "type",
                 "http_version",
                 "method",
@@ -35,6 +36,7 @@ class TestHTTPRequest(DaphneTestCase):
             optional_keys={"scheme", "root_path", "client", "server"},
             actual_keys=scope.keys(),
         )
+        self.assertEqual(scope["asgi"]["version"], "3.0")
         # Check that it is the right type
         self.assertEqual(scope["type"], "http")
         # Method (uppercased unicode string)
@@ -120,10 +122,7 @@ class TestHTTPRequest(DaphneTestCase):
         self.assert_valid_http_scope(scope, "GET", request_path, params=request_params)
         self.assert_valid_http_request_message(messages[0], body=b"")
 
-    @given(
-        request_path=http_strategies.http_path(),
-        chunk_size=integers(min_value=1),
-    )
+    @given(request_path=http_strategies.http_path(), chunk_size=integers(min_value=1))
     @settings(max_examples=5, deadline=5000)
     def test_request_body_chunking(self, request_path, chunk_size):
         """

tests/test_websocket.py

@@ -23,10 +23,18 @@ class TestWebsocket(DaphneTestCase):
         """
         # Check overall keys
         self.assert_key_sets(
-            required_keys={"type", "path", "raw_path", "query_string", "headers"},
+            required_keys={
+                "asgi",
+                "type",
+                "path",
+                "raw_path",
+                "query_string",
+                "headers",
+            },
             optional_keys={"scheme", "root_path", "client", "server", "subprotocols"},
             actual_keys=scope.keys(),
         )
+        self.assertEqual(scope["asgi"]["version"], "3.0")
         # Check that it is the right type
         self.assertEqual(scope["type"], "websocket")
         # Path