bpo-36916: asyncio: Swallow unhandled write() exception (GH-13313)
diff --git a/Lib/asyncio/streams.py b/Lib/asyncio/streams.py
index d9a9f5e..146a338 100644
--- a/Lib/asyncio/streams.py
+++ b/Lib/asyncio/streams.py
@@ -329,6 +329,13 @@
closed.exception()
+def _swallow_unhandled_exception(task):
+ # Do a trick to suppress unhandled exception
+ # if stream.write() was used without await and
+ # stream.drain() was paused and resumed with an exception
+ task.exception()
+
+
class StreamWriter:
"""Wraps a Transport.
@@ -393,7 +400,9 @@
# fast path, the stream is not paused
# no need to wait for resume signal
return self._complete_fut
- return self._loop.create_task(self.drain())
+ ret = self._loop.create_task(self.drain())
+ ret.add_done_callback(_swallow_unhandled_exception)
+ return ret
def write_eof(self):
return self._transport.write_eof()