134 lines
5.2 KiB
Python
134 lines
5.2 KiB
Python
# Copyright 2016 Internap.
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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 kombu
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from oslo_log import log
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LOG = log.getLogger(__name__)
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class RetryAdapter(object):
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def __init__(self, config, connection, retry_producer=None, dead_producer=None):
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self.config = config
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self.connection = connection
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retry_exchange = self._configure_retry_exchanges(self.connection)
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dead_exchange = self._configure_dead_exchange(self.connection)
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self._retry_producer = retry_producer or kombu.Producer(self.connection, exchange=retry_exchange)
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self._dead_producer = dead_producer or kombu.Producer(self.connection, exchange=dead_exchange)
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def publish_to_dead_letter(self, message):
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death_count = self._get_rejected_count(message)
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LOG.info('Message die %d times', death_count)
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if death_count < self.config.collector.max_retries:
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LOG.info('Publishing message to retry queue')
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self._publish_message(self._retry_producer, message)
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else:
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LOG.info('Publishing message to dead letter queue')
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self._publish_message(self._dead_producer, message)
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def _configure_retry_exchanges(self, connection):
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def declare_queues():
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channel = connection.channel()
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retry_exchange = kombu.Exchange(
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name=self.config.collector.retry_exchange,
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type='direct',
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channel=channel)
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retry_queue = kombu.Queue(
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name=self.config.collector.retry_queue,
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exchange=retry_exchange,
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routing_key=self.config.collector.routing_key,
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queue_arguments=self._get_queue_arguments(),
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channel=channel)
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main_exchange = kombu.Exchange(
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name=self.config.collector.retry_return_exchange,
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type='direct',
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channel=channel)
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main_queue = kombu.Queue(
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name=self.config.collector.queue,
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exchange=main_exchange,
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durable=False,
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routing_key=self.config.collector.routing_key,
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channel=channel)
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retry_queue.declare()
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main_queue.declare()
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return retry_exchange
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def error_callback(exception, interval):
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LOG.error('Failed to declare queues and exchanges, retrying in %d seconds. %r', interval, exception)
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declare_queues = connection.ensure(connection, declare_queues, errback=error_callback,
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interval_start=0, interval_step=5, interval_max=30)
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return declare_queues()
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def _configure_dead_exchange(self, connection):
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def declare_dead_queue():
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channel = connection.channel()
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dead_exchange = kombu.Exchange(
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name=self.config.collector.dead_exchange,
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type='direct',
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channel=channel)
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dead_queue = kombu.Queue(
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name=self.config.collector.dead_queue,
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routing_key=self.config.collector.routing_key,
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exchange=dead_exchange,
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channel=channel)
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dead_queue.declare()
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return dead_exchange
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def error_callback(exception, interval):
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LOG.error('Failed to declare dead queue and exchange, retrying in %d seconds. %r',
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interval, exception)
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declare_dead_queue = connection.ensure(connection, declare_dead_queue, errback=error_callback,
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interval_start=0, interval_step=5, interval_max=30)
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return declare_dead_queue()
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def _get_queue_arguments(self):
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return {
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"x-message-ttl": self.config.collector.retry_ttl * 1000,
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"x-dead-letter-exchange": self.config.collector.retry_return_exchange,
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"x-dead-letter-routing-key": self.config.collector.routing_key,
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}
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def _get_rejected_count(self, message):
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if 'x-death' in message.headers:
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return len(message.headers['x-death'])
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return 0
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def _publish_message(self, producer, message):
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publish = self.connection.ensure(producer, producer.publish, errback=self._error_callback,
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interval_start=0, interval_step=5, interval_max=30)
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publish(message.body,
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routing_key=message.delivery_info['routing_key'],
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headers=message.headers,
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content_type=message.content_type,
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content_encoding=message.content_encoding)
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def _error_callback(self, exception, interval):
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LOG.error('Failed to publish message to dead letter queue, retrying in %d seconds. %r',
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interval, exception)
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