[3.12] GH-106684: Close asyncio.StreamWriter when asyncio.StreamWriter is not closed by application (GH-107650) (#107656)

miss-islington · kumaraditya303 · web-flow · commit 7853c7690676 · 2023-08-10T11:24:22.000+02:00
GH-106684: raise `ResourceWarning` when `asyncio.StreamWriter` is not closed (GH-107650) (cherry picked from commit 41178e4) Co-authored-by: Kumar Aditya <kumaraditya@python.org> Co-authored-by: Kumar Aditya <59607654+kumaraditya303@users.noreply.github.com>
diff --git a/Lib/asyncio/streams.py b/Lib/asyncio/streams.py
@@ -392,6 +392,10 @@ async def start_tls(self, sslcontext, *,
         self._transport = new_transport
         protocol._replace_writer(self)
 
+    def __del__(self):
+        if not self._transport.is_closing():
+            self.close()
+
 
 class StreamReader:
 
diff --git a/Misc/NEWS.d/next/Library/2023-08-05-05-10-41.gh-issue-106684.P9zRXb.rst b/Misc/NEWS.d/next/Library/2023-08-05-05-10-41.gh-issue-106684.P9zRXb.rst
@@ -0,0 +1 @@
+Close :class:`asyncio.StreamWriter` when it is not closed by application leading to memory leaks. Patch by Kumar Aditya.

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1 @@`
	`1`	+Close :class:`asyncio.StreamWriter` when it is not closed by application leading to memory leaks. Patch by Kumar Aditya.