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Fixes issue when asyncio read is cancelled and data is still sent by Dynamips hypervisor. Fixes #113.

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This commit is contained in:
grossmj 2015-03-28 19:23:01 -06:00
parent 056ff14437
commit ee8362d89a
1 changed files with 9 additions and 3 deletions
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12
gns3server/modules/dynamips/dynamips_hypervisor.py
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@ -265,6 +265,7 @@ class DynamipsHypervisor:
command = command.strip() + '\n'
log.debug("sending {}".format(command))
self._writer.write(command.encode())
yield from self._writer.drain()
except OSError as e:
raise DynamipsError("Lost communication with {host}:{port} :{error}, Dynamips process running: {run}"
.format(host=self._host, port=self._port, error=e, run=self.is_running()))
@ -274,11 +275,16 @@ class DynamipsHypervisor:
buf = ''
while True:
try:
chunk = yield from self._reader.read(1024) # match to Dynamips' buffer size
if not chunk:
try:
line = yield from self._reader.readline()
except asyncio.CancelledError:
# task has been canceled but continue to read
# any remaining data sent by the hypervisor
continue
if not line:
raise DynamipsError("No data returned from {host}:{port}, Dynamips process running: {run}"
.format(host=self._host, port=self._port, run=self.is_running()))
buf += chunk.decode()
buf += line.decode()
except OSError as e:
raise DynamipsError("Lost communication with {host}:{port} :{error}, Dynamips process running: {run}"
.format(host=self._host, port=self._port, error=e, run=self.is_running()))