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.

1 files changed, 10 insertions, 0 deletions

diff --git a/django/core/exceptions.py b/django/core/exceptions.py
index 0e85397b9c..dc084b8692 100644
--- a/django/core/exceptions.py
+++ b/django/core/exceptions.py
@@ -63,6 +63,11 @@ class RequestDataTooBig(SuspiciousOperation):
     pass
 
 
+class RequestAborted(Exception):
+    """The request was closed before it was completed, or timed out."""
+    pass
+
+
 class PermissionDenied(Exception):
     """The user did not have permission to do that"""
     pass
@@ -181,3 +186,8 @@ class ValidationError(Exception):
 class EmptyResultSet(Exception):
     """A database query predicate is impossible."""
     pass
+
+
+class SynchronousOnlyOperation(Exception):
+    """The user tried to call a sync-only function from an async context."""
+    pass