Remove the partial implementation of ack_on_error

The ack_on_error is not used by the abstraction layer, and only the
rabbitmq implements it.

This commit remove this feature, and next commit will add a new way for
this.

Partial implements blueprint notification-subscriber-server

Change-Id: I17eb23f2e3e374630251576438011f186e5b2150

oslo/messaging/_drivers/amqp.py

@@ -164,13 +164,11 @@ class ConnectionContext(rpc_common.Connection):
     def create_worker(self, topic, proxy, pool_name):
         self.connection.create_worker(topic, proxy, pool_name)
 
-    def join_consumer_pool(self, callback, pool_name, topic, exchange_name,
-                           ack_on_error=True):
+    def join_consumer_pool(self, callback, pool_name, topic, exchange_name):
         self.connection.join_consumer_pool(callback,
                                            pool_name,
                                            topic,
-                                           exchange_name,
-                                           ack_on_error)
+                                           exchange_name)
 
     def consume_in_thread(self):
         self.connection.consume_in_thread()

oslo/messaging/_drivers/impl_qpid.py

@@ -189,7 +189,6 @@ class ConsumerBase(object):
         except Exception:
             LOG.exception(_("Failed to process message... skipping it."))
         finally:
-            # TODO(sandy): Need support for optional ack_on_error.
             self.session.acknowledge(message)
 
     def get_receiver(self):
@@ -729,7 +728,7 @@ class Connection(object):
         return consumer
 
     def join_consumer_pool(self, callback, pool_name, topic,
-                           exchange_name=None, ack_on_error=True):
+                           exchange_name=None):
         """Register as a member of a group of consumers for a given topic from
         the specified exchange.
 

oslo/messaging/_drivers/impl_rabbit.py

@@ -134,7 +134,6 @@ 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):
@@ -147,32 +146,16 @@ class ConsumerBase(object):
     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.
+        Messages that are processed and ack'ed.
         """
 
-        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()
+            LOG.exception(_("Failed to process message"
+                            " ... skipping it."))
+        message.ack()
 
     def consume(self, *args, **kwargs):
         """Actually declare the consumer on the amqp channel.  This will
@@ -708,12 +691,11 @@ class Connection(object):
         self.declare_consumer(DirectConsumer, topic, callback)
 
     def declare_topic_consumer(self, topic, callback=None, queue_name=None,
-                               exchange_name=None, ack_on_error=True):
+                               exchange_name=None):
         """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)
 
@@ -779,7 +761,7 @@ class Connection(object):
         self.declare_topic_consumer(topic, proxy_cb, pool_name)
 
     def join_consumer_pool(self, callback, pool_name, topic,
-                           exchange_name=None, ack_on_error=True):
+                           exchange_name=None):
         """Register as a member of a group of consumers for a given topic from
         the specified exchange.
 
@@ -800,7 +782,6 @@ class Connection(object):
             topic=topic,
             exchange_name=exchange_name,
             callback=callback_wrapper,
-            ack_on_error=ack_on_error,
         )