def send_subscribe_request(args_):
try:
self.connection.subscribe(channel,
args_,
callback=subscribe_callback)
except Exception as e:
logger.exception(e)
def _start_disconnecting(self):
logger.info('_start_disconnecting')
if self.connection:
try:
self.connection.stop()
except Exception as e:
logger.exception(e)
def _authenticate(self, auth_delegate, callback):
def callback_(outcome):
if type(outcome) == auth.Done:
if auth_delegate not in self._successful_auth_delegates:
self._successful_auth_delegates.append(auth_delegate)
callback(outcome)
try:
self.connection.authenticate(auth_delegate, callback=callback_)
except Exception as e:
logger.exception(e)
def _connect(self):
logger.info('_connect')
self._time_of_last_reconnect = time.time()
self.connection = Connection(self._endpoint, self._appkey, self,
self.https_proxy, self._protocol)
try:
self.connection.start()
self._queue.put(a.ConnectingComplete())
except Exception as e:
logger.exception(e)
self.last_connecting_error = e
self._queue.put(a.ConnectingFailed())
def _perform_state_callback(self, callback_name, *args):
try:
logger.info('entering callback %s', callback_name)
try:
callback = getattr(self.observer, callback_name)
callback(*args)
except AttributeError:
pass
except Exception as e:
logger.error('Caught exception in state callback')
logger.exception(e)
self._queue.put(a.Stop())
finally:
logger.info('exiting callback %s', callback_name)
def _perform_state_callback(self, callback_name, *args):
if self.observer:
current_thread_name = threading.current_thread().name
logger.debug('entering subscription callback %s on %s',
callback_name, current_thread_name)
callback = None
try:
callback = getattr(self.observer, callback_name)
except AttributeError:
pass
try:
if callback:
callback(*args)
except Exception as e:
logger.error('Caught exception in subscription callback')
logger.exception(e)
finally:
logger.debug('exiting subscription callback %s on %s',
callback_name, current_thread_name)
def _restore_auth_and_return_true_if_failed(self):
logger.info('_restore_auth_and_return_true_if_failed')
if not self.restore_auth_on_reconnect:
return False
counter = [len(self._successful_auth_delegates)]
logger.debug('Restoring %d authentications', counter[0])
if counter[0] == 0:
return False
ready_event = threading.Event()
def callback(outcome):
logger.debug('Outcome: %s', outcome)
if type(outcome) == auth.Done:
logger.debug('Restored auth')
counter[0] -= 1
if counter[0] == 0:
ready_event.set()
else:
ready_event.set()
for ad in self._successful_auth_delegates:
ready_event.clear()
try:
self.connection.authenticate(ad, callback)
except Exception as e:
logger.exception(e)
ready_event.wait(10)
if counter[0] == 0:
logger.debug('Restoring authentications: done')
return False
else:
logger.error('Failed to restore %d authentications', counter[0])
return True
def process_one_message(self, timeout=1):
'''Must be called from a single thread
returns True if the message was Dispose()'''
try:
m = self._queue.get(block=True, timeout=timeout)
except queue.Empty:
logger.debug('queue is empty')
return False
t = type(m)
logger.info('Begin handling %s', t.__name__)
if t == a.ChannelData:
data = m.data
channel = data['subscription_id']
subscription = self.subscriptions.get(channel)
if subscription:
try:
subscription.on_subscription_data(data)
except Exception as e:
logger.error("Exception in on_subscription_data")
logger.exception(e)
self._queue.put(a.Stop())
else:
logger.error('Subscription for %s not found', data)
elif t == a.Start:
self._sm.Start()
elif t == a.Stop:
self._sm.Stop()
elif t == a.Dispose:
self._sm.Dispose()
self._queue.task_done()
return True
elif t == a.Publish:
if self.is_connected():
try:
self.connection.publish_preserialized_message(
m.channel, m.message, m.callback)
except Exception as e:
logger.exception(e)
else:
self._offline_queue.append(m)
elif t == a.Subscribe:
self._subscribe(m.channel_or_subscription_id,
m.mode,
m.observer,
args=m.args)
elif t == a.Unsubscribe:
self._unsubscribe(m.channel_or_subscription_id)
elif t == a.Read:
self.connection.read(m.key, m.args, m.callback)
elif t == a.Write:
self.connection.write_preserialized_value(m.key, m.value,
m.callback)
elif t == a.Delete:
self.connection.delete(m.key, m.callback)
elif t == a.Authenticate:
if self.is_connected():
self._authenticate(m.auth_delegate, m.callback)
else:
self._offline_queue.append(m)
elif t == a.SolicitedPDU:
try:
m.callback(m.payload)
except Exception as e:
logger.error("Exception in a solicited PDU callback")
logger.exception(e)
self._queue.put(a.Stop())
elif t == a.Tick:
self._sm.Tick()
elif t == a.ConnectingComplete:
self._sm.ConnectingComplete()
elif t == a.ConnectingFailed:
self._sm.ConnectingFailed()
elif t == a.ConnectionClosed:
self._sm.ConnectionClosed()
elif t == a.ChannelError:
self._sm.ChannelError(m.channel, m.payload)
elif t == a.InternalError:
self._sm.InternalError(m.payload)
elif t == a.FastForward:
self._perform_state_callback('on_fast_forward', m.channel)
else:
logger.error('Unexpected event %s: %s', m, t)
self._queue.task_done()
logger.info('Finish handling %s', t.__name__)
return False
def send_unsubscribe_request():
try:
self.connection.unsubscribe(channel, unsubscribe_callback)
except Exception as e:
logger.exception(e)