diff options
Diffstat (limited to 'openstack/common/rpc/impl_kombu.py')
| -rw-r--r-- | openstack/common/rpc/impl_kombu.py | 53 |
1 files changed, 40 insertions, 13 deletions
diff --git a/openstack/common/rpc/impl_kombu.py b/openstack/common/rpc/impl_kombu.py index c062d9a..8fb3504 100644 --- a/openstack/common/rpc/impl_kombu.py +++ b/openstack/common/rpc/impl_kombu.py @@ -30,6 +30,7 @@ import kombu.entity import kombu.messaging from oslo.config import cfg +from openstack.common import excutils from openstack.common.gettextutils import _ from openstack.common import network_utils from openstack.common.rpc import amqp as rpc_amqp @@ -129,6 +130,7 @@ class ConsumerBase(object): self.tag = str(tag) self.kwargs = kwargs self.queue = None + self.ack_on_error = kwargs.get('ack_on_error', True) self.reconnect(channel) def reconnect(self, channel): @@ -138,6 +140,36 @@ class ConsumerBase(object): self.queue = kombu.entity.Queue(**self.kwargs) self.queue.declare() + def _callback_handler(self, message, callback): + """Call callback with deserialized message. + + Messages that are processed without exception are ack'ed. + + If the message processing generates an exception, it will be + ack'ed if ack_on_error=True. Otherwise it will be .reject()'ed. + Rejection is better than waiting for the message to timeout. + Rejected messages are immediately requeued. + """ + + ack_msg = False + try: + msg = rpc_common.deserialize_msg(message.payload) + callback(msg) + ack_msg = True + except Exception: + if self.ack_on_error: + ack_msg = True + LOG.exception(_("Failed to process message" + " ... skipping it.")) + else: + LOG.exception(_("Failed to process message" + " ... will requeue.")) + finally: + if ack_msg: + message.ack() + else: + message.reject() + def consume(self, *args, **kwargs): """Actually declare the consumer on the amqp channel. This will start the flow of messages from the queue. Using the @@ -150,8 +182,6 @@ class ConsumerBase(object): If kwargs['nowait'] is True, then this call will block until a message is read. - Messages will automatically be acked if the callback doesn't - raise an exception """ options = {'consumer_tag': self.tag} @@ -162,13 +192,7 @@ class ConsumerBase(object): def _callback(raw_message): message = self.channel.message_to_python(raw_message) - try: - msg = rpc_common.deserialize_msg(message.payload) - callback(msg) - except Exception: - LOG.exception(_("Failed to process message... skipping it.")) - finally: - message.ack() + self._callback_handler(message, callback) self.queue.consume(*args, callback=_callback, **options) @@ -635,8 +659,8 @@ class Connection(object): def _consume(): if info['do_consume']: - queues_head = self.consumers[:-1] - queues_tail = self.consumers[-1] + queues_head = self.consumers[:-1] # not fanout. + queues_tail = self.consumers[-1] # fanout for queue in queues_head: queue.consume(nowait=True) queues_tail.consume(nowait=False) @@ -685,11 +709,12 @@ class Connection(object): self.declare_consumer(DirectConsumer, topic, callback) def declare_topic_consumer(self, topic, callback=None, queue_name=None, - exchange_name=None): + exchange_name=None, ack_on_error=True): """Create a 'topic' consumer.""" self.declare_consumer(functools.partial(TopicConsumer, name=queue_name, exchange_name=exchange_name, + ack_on_error=ack_on_error, ), topic, callback) @@ -724,6 +749,7 @@ class Connection(object): def consume_in_thread(self): """Consumer from all queues/consumers in a greenthread.""" + @excutils.forever_retry_uncaught_exceptions def _consumer_thread(): try: self.consume() @@ -754,7 +780,7 @@ class Connection(object): self.declare_topic_consumer(topic, proxy_cb, pool_name) def join_consumer_pool(self, callback, pool_name, topic, - exchange_name=None): + exchange_name=None, ack_on_error=True): """Register as a member of a group of consumers for a given topic from the specified exchange. @@ -775,6 +801,7 @@ class Connection(object): topic=topic, exchange_name=exchange_name, callback=callback_wrapper, + ack_on_error=ack_on_error, ) |