From 41178e41995992bbe417f94bce158de93f9e3188 Mon Sep 17 00:00:00 2001
From: Kumar Aditya <kumaraditya@python.org>
Date: Sat, 5 Aug 2023 17:48:15 +0530
Subject: GH-106684: raise `ResourceWarning` when `asyncio.StreamWriter` is not
 closed (#107650)

---
 Lib/asyncio/streams.py | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'Lib/asyncio/streams.py')

diff --git a/Lib/asyncio/streams.py b/Lib/asyncio/streams.py
index bf15f517e50..b7ad365709b 100644
--- a/Lib/asyncio/streams.py
+++ b/Lib/asyncio/streams.py
@@ -5,6 +5,7 @@ __all__ = (
 import collections
 import socket
 import sys
+import warnings
 import weakref
 
 if hasattr(socket, 'AF_UNIX'):
@@ -392,6 +393,11 @@ class StreamWriter:
         self._transport = new_transport
         protocol._replace_writer(self)
 
+    def __del__(self, warnings=warnings):
+        if not self._transport.is_closing():
+            self.close()
+            warnings.warn(f"unclosed {self!r}", ResourceWarning)
+
 
 class StreamReader:
 
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