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# Licensed to the StackStorm, Inc ('StackStorm') under one or more |
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# contributor license agreements. See the NOTICE file distributed with |
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# this work for additional information regarding copyright ownership. |
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# The ASF licenses this file to You under the Apache License, Version 2.0 |
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# (the "License"); you may not use this file except in compliance with |
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# the License. You may obtain a copy of the License at |
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# |
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# http://www.apache.org/licenses/LICENSE-2.0 |
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# |
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# Unless required by applicable law or agreed to in writing, software |
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# distributed under the License is distributed on an "AS IS" BASIS, |
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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# See the License for the specific language governing permissions and |
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# limitations under the License. |
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import eventlet |
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from kombu import Connection, Queue |
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from kombu.mixins import ConsumerMixin |
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from oslo_config import cfg |
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from st2common.models.api.action import LiveActionAPI |
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from st2common.models.api.execution import ActionExecutionAPI |
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from st2common.transport import announcement, liveaction, execution, publishers |
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from st2common.transport import utils as transport_utils |
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from st2common import log as logging |
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__all__ = [ |
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'get_listener', |
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'get_listener_if_set' |
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] |
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LOG = logging.getLogger(__name__) |
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_listener = None |
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class Listener(ConsumerMixin): |
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def __init__(self, connection): |
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self.connection = connection |
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self.queues = [] |
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self._stopped = False |
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def get_consumers(self, consumer, channel): |
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return [ |
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consumer(queues=[announcement.get_queue(routing_key=publishers.ANY_RK, |
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exclusive=True)], |
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accept=['pickle'], |
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callbacks=[self.processor()]), |
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consumer(queues=[execution.get_queue(routing_key=publishers.ANY_RK, |
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exclusive=True)], |
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accept=['pickle'], |
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callbacks=[self.processor(ActionExecutionAPI)]), |
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consumer(queues=[Queue(None, |
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liveaction.LIVEACTION_XCHG, |
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routing_key=publishers.ANY_RK, |
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exclusive=True)], |
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accept=['pickle'], |
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callbacks=[self.processor(LiveActionAPI)]) |
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] |
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def processor(self, model=None): |
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def process(body, message): |
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from_model_kwargs = {'mask_secrets': cfg.CONF.api.mask_secrets} |
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meta = message.delivery_info |
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event_name = '%s__%s' % (meta.get('exchange'), meta.get('routing_key')) |
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try: |
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if model: |
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body = model.from_model(body, **from_model_kwargs) |
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self.emit(event_name, body) |
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finally: |
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message.ack() |
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return process |
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def emit(self, event, body): |
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pack = (event, body) |
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for queue in self.queues: |
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queue.put(pack) |
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def generator(self): |
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queue = eventlet.Queue() |
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self.queues.append(queue) |
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try: |
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while not self._stopped: |
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try: |
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yield queue.get(timeout=cfg.CONF.stream.heartbeat) |
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except eventlet.queue.Empty: |
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yield |
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finally: |
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self.queues.remove(queue) |
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def shutdown(self): |
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self._stopped = True |
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def listen(listener): |
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try: |
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listener.run() |
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finally: |
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listener.shutdown() |
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def get_listener(): |
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global _listener |
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if not _listener: |
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with Connection(transport_utils.get_messaging_urls()) as conn: |
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_listener = Listener(conn) |
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eventlet.spawn_n(listen, _listener) |
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return _listener |
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def get_listener_if_set(): |
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global _listener |
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return _listener |
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StackStorm /
st2
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Usage of
globalcan make code hard to read and test, its usage is generally not recommended unless you are dealing with legacy code.