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Graceful shutdown support #2

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Graceful shutdown support #2

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23 changes: 23 additions & 0 deletions msgpackrpc/loop.py
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Original file line number Diff line number Diff line change
@@ -1,4 +1,6 @@
from tornado import ioloop
import signal
from time import time

class Loop(object):
"""\
Expand All @@ -19,6 +21,10 @@ def start(self):
Starts the Tornado's ioloop if it's not running.
"""

handler = _LoopShutdownHandler(self._ioloop)
signal.signal(signal.SIGINT, handler)
signal.signal(signal.SIGTERM, handler)
signal.signal(signal.SIGHUP, handler)
self._ioloop.start()

def stop(self):
Expand All @@ -42,3 +48,20 @@ def dettach_periodic_callback(self):
if self._periodic_callback is not None:
self._periodic_callback.stop()
self._periodic_callback = None


class _LoopShutdownHandler:
def __init__(self, loop):
self._ioloop = loop

def __call__(self, *args, **argv):
loop = self._ioloop
deadline = time() + 3

def stop():
now = time()
if now < deadline and (loop._callbacks or loop._timeouts):
loop.add_timeout(now + 1, stop)
else:
loop.stop()
stop()