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import importlib
from django.conf import settings
from django.core.exceptions import ImproperlyConfigured
from django.urls.exceptions import Resolver404
from django.urls.resolvers import URLResolver
All Routing instances inside this file are also valid ASGI applications - with
new Channels routing, whatever you end up with as the top level object is just
served up as the "ASGI application".
def get_default_application():
Gets the default application, set in the ASGI_APPLICATION setting.
path, name = settings.ASGI_APPLICATION.rsplit(".", 1)
except (ValueError, AttributeError):
raise ImproperlyConfigured("Cannot find ASGI_APPLICATION setting.")
module = importlib.import_module(path)
except ImportError:
raise ImproperlyConfigured("Cannot import ASGI_APPLICATION module %r" % path)
value = getattr(module, name)
except AttributeError:
raise ImproperlyConfigured(
"Cannot find %r in ASGI_APPLICATION module %s" % (name, path)
return value
Using ProtocolTypeRouter without an explicit "http" key is deprecated.
Given that you have not passed the "http" you likely should use Django's
from django.core.asgi import get_asgi_application
application = ProtocolTypeRouter(
"http": get_asgi_application()
# Other protocols here.
class ProtocolTypeRouter:
Takes a mapping of protocol type names to other Application instances,
and dispatches to the right one based on protocol name (or raises an error)
def __init__(self, application_mapping):
self.application_mapping = application_mapping
async def __call__(self, scope, receive, send):
if scope["type"] in self.application_mapping:
application = self.application_mapping[scope["type"]]
return await application(scope, receive, send)
raise ValueError(
"No application configured for scope type %r" % scope["type"]
class URLRouter:
Routes to different applications/consumers based on the URL path.
Works with anything that has a ``path`` key, but intended for WebSocket
and HTTP. Uses Django's django.urls objects for resolution -
path() or re_path().
#: This router wants to do routing based on scope[path] or
#: scope[path_remaining]. ``path()`` entries in URLRouter should not be
#: treated as endpoints (ended with ``$``), but similar to ``include()``.
_path_routing = True
def __init__(self, routes):
self.routes = routes
for route in self.routes:
# The inner ASGI app wants to do additional routing, route
# must not be an endpoint
if getattr(route.callback, "_path_routing", False) is True:
route.pattern._is_endpoint = False
if not route.callback and isinstance(route, URLResolver):
raise ImproperlyConfigured(
"%s: include() is not supported in URLRouter. Use nested"
" URLRouter instances instead." % (route,)
async def __call__(self, scope, receive, send):
# Get the path
path = scope.get("path_remaining", scope.get("path", None))
if path is None:
raise ValueError("No 'path' key in connection scope, cannot route URLs")
# Remove leading / to match Django's handling
path = path.lstrip("/")
# Run through the routes we have until one matches
for route in self.routes:
match = route.pattern.match(path)
if match:
new_path, args, kwargs = match
# Add defaults to kwargs from the URL pattern.
# Add args or kwargs into the scope
outer = scope.get("url_route", {})
application = route.callback
return await application(
"args": outer.get("args", ()) + args,
"kwargs": {**outer.get("kwargs", {}), **kwargs},
except Resolver404:
if "path_remaining" in scope:
raise Resolver404("No route found for path %r." % path)
# We are the outermost URLRouter
raise ValueError("No route found for path %r." % path)
class ChannelNameRouter:
Maps to different applications based on a "channel" key in the scope
(intended for the Channels worker mode)
def __init__(self, application_mapping):
self.application_mapping = application_mapping
async def __call__(self, scope, receive, send):
if "channel" not in scope:
raise ValueError(
"ChannelNameRouter got a scope without a 'channel' key. "
+ "Did you make sure it's only being used for 'channel' type messages?"
if scope["channel"] in self.application_mapping:
application = self.application_mapping[scope["channel"]]
return await application(scope, receive, send)
raise ValueError(
"No application configured for channel name %r" % scope["channel"]