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check that stream is open before trying to read #2670

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merged 2 commits into from
Jun 9, 2019
Merged

check that stream is open before trying to read #2670

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97e506e
check that stream is open before reading from stream
Zsailer Jun 3, 2019
1a7e997
extra space to follow black format
Zsailer Jun 3, 2019
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1 change: 1 addition & 0 deletions tornado/iostream.py
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Original file line number Diff line number Diff line change
Expand Up @@ -794,6 +794,7 @@ def _handle_read(self) -> None:
self._read_from_buffer(pos)

def _start_read(self) -> Future:
self._check_closed() # Before reading, check that stream is not closed.
assert self._read_future is None, "Already reading"
self._read_future = Future()
return self._read_future
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