def test_add_callback_from_signal_other_thread(self): # Very crude test, just to make sure that we cover this case. # This also happens to be the first test where we run an IOLoop in # a non-main thread. other_ioloop = IOLoop() thread = threading.Thread(target=other_ioloop.start) thread.start() other_ioloop.add_callback_from_signal(other_ioloop.stop) thread.join() other_ioloop.close()
class SwimpyProcess(multiprocessing.Process): def __init__(self, routes, node, pipe, *args, **kwargs): super(self.__class__, self).__init__(*args, **kwargs) self.routes = routes self.node = node self.pipe = pipe self.bind_addr = node.addr self.bind_port = node.port # We don't want to initialize these until after we fork self.ioloop = None self.server = None self.app = None def _handle_pipe_messages(self, *args, **kwargs): message = self.pipe.recv() unpacked_message = msgpack.unpackb(message) message_type = unpacked_message.pop('type') if message_type == Sync.MESSAGE_TYPE: self.pipe.send(self.app.nodes) def run(self): signal.signal(signal.SIGTERM, self.shutdown_sig_handler) signal.signal(signal.SIGINT, self.shutdown_sig_handler) from tornado.ioloop import IOLoop self.ioloop = IOLoop().current() # get a reference to the IOLoop post-fork LOGGER.info('Starting server on tcp://{}:{}'.format(self.bind_addr, self.bind_port)) self.app = Application(routes=self.routes, node=self.node, pipe=self.pipe) self.server = Server(message_handler=self.app.route_stream_message) self.server.listen(self.bind_port, address=self.bind_addr) self.ioloop.add_handler(self.pipe, self._handle_pipe_messages, self.ioloop.READ) self.ioloop.spawn_callback(self.app.send_buffered_gossip) # Ping a random node every PING_INVERVAL seconds, +/- 10% # This jitter should reduce the average aggregate peak network throughput # when running with large cluster sized PeriodicCallbackWithSplay(self.app.ping_random_node, PING_INTERVAL * 1000, splay_pct=10).start() LOGGER.info('Starting ioloop') self.ioloop.start() def stop(self, shutdown_timeout=SHUTDOWN_TIMEOUT, graceful=True): """ Trigger a graceful stop of the server and the server's ioloop, allowing in-flight connections to finish Fall back to a "less graceful" stop when stop is reached """ def poll_stop(): # Tornado uses a "waker" handler internally that we'd like to ignore here remaining_handlers = { k: v for k, v in self.ioloop._handlers.iteritems() if k != self.ioloop._waker.fileno() } # Poll for any remaining connections remaining_count = len(remaining_handlers) # Once all handlers have been removed, we can stop safely if remaining_count == 0: LOGGER.info('All finished! Graceful stop complete') self.ioloop.stop() else: LOGGER.info('Waiting on IO handlers ({} remaining). ' 'Handlers: {!r}'.format(remaining_count, remaining_handlers)) self.ioloop.remove_handler(self.pipe) self.server.shutdown() self.server.stop() if graceful: # Poll the IOLoop's handlers until they all shut down. poller = PeriodicCallback(poll_stop, 500, io_loop=self.ioloop) poller.start() self.ioloop.add_timeout(self.ioloop.time() + shutdown_timeout, self.ioloop.stop) else: self.ioloop.stop() def shutdown_sig_handler(self, sig, frame): """ Signal handler for "stop" signals (SIGTERM, SIGINT) """ LOGGER.warning('{!r} caught signal {!r}! Shutting down'.format(self, sig)) try: self.ioloop.add_callback_from_signal(self.stop) except Exception as e: LOGGER.error( 'Encountered exception while shutting down: {}'.format(e) ) sys.exit(1)