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-rw-r--r--asyncio/streams.py11
1 files changed, 11 insertions, 0 deletions
diff --git a/asyncio/streams.py b/asyncio/streams.py
index 6484c43..409b2f9 100644
--- a/asyncio/streams.py
+++ b/asyncio/streams.py
@@ -153,15 +153,25 @@ class FlowControlMixin(protocols.Protocol):
self._paused = False
self._drain_waiter = None
self._connection_lost = False
+ self._transport = None
+
+ def connection_made(self, transport):
+ self._transport = transport
def pause_writing(self):
assert not self._paused
+ if self._transport is not None and self._transport.closing:
+ raise RuntimeError('Cannot call pause_writing() '
+ 'on closing or closed transport')
self._paused = True
if self._loop.get_debug():
logger.debug("%r pauses writing", self)
def resume_writing(self):
assert self._paused
+ if self._transport is not None and self._transport.closing:
+ raise RuntimeError('Cannot call resume_writing() '
+ 'on closing or closed transport')
self._paused = False
if self._loop.get_debug():
logger.debug("%r resumes writing", self)
@@ -217,6 +227,7 @@ class StreamReaderProtocol(FlowControlMixin, protocols.Protocol):
self._client_connected_cb = client_connected_cb
def connection_made(self, transport):
+ super().connection_made(transport)
self._stream_reader.set_transport(transport)
if self._client_connected_cb is not None:
self._stream_writer = StreamWriter(transport, self,