From 4a52a71956a8d46fcb7294ac71734504bb09bcc2 Mon Sep 17 00:00:00 2001
From: S. Solomon Darnell
Date: Fri, 28 Mar 2025 21:52:21 -0500
Subject: two version of R2R are here

---
 .../site-packages/asgiref/compatibility.py         | 48 ++++++++++++++++++++++
 1 file changed, 48 insertions(+)
 create mode 100644 .venv/lib/python3.12/site-packages/asgiref/compatibility.py

(limited to '.venv/lib/python3.12/site-packages/asgiref/compatibility.py')

diff --git a/.venv/lib/python3.12/site-packages/asgiref/compatibility.py b/.venv/lib/python3.12/site-packages/asgiref/compatibility.py
new file mode 100644
index 00000000..3a2a63e6
--- /dev/null
+++ b/.venv/lib/python3.12/site-packages/asgiref/compatibility.py
@@ -0,0 +1,48 @@
+import inspect
+
+from .sync import iscoroutinefunction
+
+
+def is_double_callable(application):
+    """
+    Tests to see if an application is a legacy-style (double-callable) application.
+    """
+    # Look for a hint on the object first
+    if getattr(application, "_asgi_single_callable", False):
+        return False
+    if getattr(application, "_asgi_double_callable", False):
+        return True
+    # Uninstanted classes are double-callable
+    if inspect.isclass(application):
+        return True
+    # Instanted classes depend on their __call__
+    if hasattr(application, "__call__"):
+        # We only check to see if its __call__ is a coroutine function -
+        # if it's not, it still might be a coroutine function itself.
+        if iscoroutinefunction(application.__call__):
+            return False
+    # Non-classes we just check directly
+    return not iscoroutinefunction(application)
+
+
+def double_to_single_callable(application):
+    """
+    Transforms a double-callable ASGI application into a single-callable one.
+    """
+
+    async def new_application(scope, receive, send):
+        instance = application(scope)
+        return await instance(receive, send)
+
+    return new_application
+
+
+def guarantee_single_callable(application):
+    """
+    Takes either a single- or double-callable application and always returns it
+    in single-callable style. Use this to add backwards compatibility for ASGI
+    2.0 applications to your server/test harness/etc.
+    """
+    if is_double_callable(application):
+        application = double_to_single_callable(application)
+    return application
-- 
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