Fixed #30451 -- Added ASGI handler and coroutine-safety.

This adds an ASGI handler, asgi.py file for the default project layout,
a few async utilities and adds async-safety to many parts of Django.

2 files changed, 7 insertions, 5 deletions

diff --git a/django/urls/base.py b/django/urls/base.py
index 1200d9a25b..0e1c3d909c 100644
--- a/django/urls/base.py
+++ b/django/urls/base.py
@@ -1,6 +1,7 @@
-from threading import local
 from urllib.parse import urlsplit, urlunsplit
 
+from asgiref.local import Local
+
 from django.utils.encoding import iri_to_uri
 from django.utils.functional import lazy
 from django.utils.translation import override
@@ -12,10 +13,10 @@ from .utils import get_callable
 # SCRIPT_NAME prefixes for each thread are stored here. If there's no entry for
 # the current thread (which is the only one we ever access), it is assumed to
 # be empty.
-_prefixes = local()
+_prefixes = Local()
 
 # Overridden URLconfs for each thread are stored here.
-_urlconfs = local()
+_urlconfs = Local()
 
 
 def resolve(path, urlconf=None):
diff --git a/django/urls/resolvers.py b/django/urls/resolvers.py
index 9d3379a821..af0508f94e 100644
--- a/django/urls/resolvers.py
+++ b/django/urls/resolvers.py
@@ -8,10 +8,11 @@ attributes of the resolved URL match.
 import functools
 import inspect
 import re
-import threading
 from importlib import import_module
 from urllib.parse import quote
 
+from asgiref.local import Local
+
 from django.conf import settings
 from django.core.checks import Error, Warning
 from django.core.checks.urls import check_resolver
@@ -380,7 +381,7 @@ class URLResolver:
         # urlpatterns
         self._callback_strs = set()
         self._populated = False
-        self._local = threading.local()
+        self._local = Local()
 
     def __repr__(self):
         if isinstance(self.urlconf_name, list) and self.urlconf_name: