180 lines
5.8 KiB
Python
180 lines
5.8 KiB
Python
# Copyright 2015 - Mirantis, Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# 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 socket
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import threading
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import kombu
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from oslo_log import log as logging
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from mistral import context as auth_ctx
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from mistral.engine.rpc_backend import base as rpc_base
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from mistral.engine.rpc_backend.kombu import base as kombu_base
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from mistral import exceptions as exc
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LOG = logging.getLogger(__name__)
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class KombuRPCServer(rpc_base.RPCServer, kombu_base.Base):
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def __init__(self, conf):
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super(KombuRPCServer, self).__init__(conf)
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self._register_mistral_serialization()
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self.exchange = conf.get('exchange', '')
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self.user_id = conf.get('user_id', 'guest')
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self.password = conf.get('password', 'guest')
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self.topic = conf.get('topic', 'mistral')
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self.server_id = conf.get('server_id', '')
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self.host = conf.get('host', 'localhost')
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self.port = conf.get('port', 5672)
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self.virtual_host = conf.get('virtual_host', '/')
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self.durable_queue = conf.get('durable_queues', False)
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self.auto_delete = conf.get('auto_delete', False)
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self.routing_key = self.topic
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self.channel = None
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self.conn = None
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self._running = threading.Event()
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self.endpoints = []
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@property
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def is_running(self):
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"""Return whether server is running."""
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return self._running.is_set()
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def run(self, executor='blocking'):
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"""Start the server."""
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self.conn = self._make_connection(
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self.host,
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self.port,
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self.user_id,
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self.password,
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self.virtual_host,
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)
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LOG.info("Connected to AMQP at %s:%s" % (self.host, self.port))
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try:
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conn = kombu.connections[self.conn].acquire(block=True)
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exchange = self._make_exchange(
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self.exchange,
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durable=self.durable_queue,
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auto_delete=self.auto_delete
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)
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queue = self._make_queue(
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self.topic,
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exchange,
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routing_key=self.routing_key,
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durable=self.durable_queue,
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auto_delete=self.auto_delete
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)
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with conn.Consumer(
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queues=queue,
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callbacks=[self._on_message_safe],
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) as consumer:
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consumer.qos(prefetch_count=1)
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self._running.set()
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while self.is_running:
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try:
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conn.drain_events(timeout=1)
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except socket.timeout:
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pass
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except KeyboardInterrupt:
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self.stop()
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LOG.info("Server with id='{0}' stopped.".format(
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self.server_id))
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return
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except socket.error as e:
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raise exc.MistralException("Broker connection failed: %s" % e)
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def stop(self):
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"""Stop the server."""
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self._running.clear()
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def _get_rpc_method(self, method_name):
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for endpoint in self.endpoints:
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if hasattr(endpoint, method_name):
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return getattr(endpoint, method_name)
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return None
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@staticmethod
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def _set_auth_ctx(ctx):
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if not isinstance(ctx, dict):
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return
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context = auth_ctx.MistralContext(**ctx)
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auth_ctx.set_ctx(context)
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return context
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def publish_message(self, body, reply_to, corr_id, res_type='response'):
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with kombu.producers[self.conn].acquire(block=True) as producer:
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producer.publish(
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body=body,
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exchange=self.exchange,
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routing_key=reply_to,
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correlation_id=corr_id,
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serializer='pickle' if res_type == 'error'
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else 'mistral_serialization',
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type=res_type
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)
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def _on_message_safe(self, request, message):
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try:
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return self._on_message(request, message)
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except Exception as e:
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self.publish_message(
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e,
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message.properties['reply_to'],
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message.properties['correlation_id'],
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res_type='error'
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)
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finally:
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message.ack()
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def _on_message(self, request, message):
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LOG.debug('Received message %s',
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request)
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is_async = request.get('async', False)
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rpc_ctx = request.get('rpc_ctx')
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redelivered = message.delivery_info.get('redelivered', None)
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rpc_method_name = request.get('rpc_method')
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arguments = request.get('arguments')
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correlation_id = message.properties['correlation_id']
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reply_to = message.properties['reply_to']
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if redelivered is not None:
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rpc_ctx['redelivered'] = redelivered
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rpc_context = self._set_auth_ctx(rpc_ctx)
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rpc_method = self._get_rpc_method(rpc_method_name)
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if not rpc_method:
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raise exc.MistralException("No such method: %s" % rpc_method_name)
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response = rpc_method(rpc_ctx=rpc_context, **arguments)
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if not is_async:
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self.publish_message(
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response,
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reply_to,
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correlation_id
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)
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def register_endpoint(self, endpoint):
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self.endpoints.append(endpoint)
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