Allow fake driver to consume multiple topics

This patch allow the fake driver to comsume multiple topics
with one listener.

Partial implements blueprint notification-subscriber-server

Change-Id: Ib52dc181e10b487854fbb398eda9f758232a1251

oslo/messaging/_drivers/amqpdriver.py

@@ -66,8 +66,8 @@ class AMQPIncomingMessage(base.IncomingMessage):
 
 class AMQPListener(base.Listener):
 
-    def __init__(self, driver, target, conn):
-        super(AMQPListener, self).__init__(driver, target)
+    def __init__(self, driver, conn):
+        super(AMQPListener, self).__init__(driver)
         self.conn = conn
         self.msg_id_cache = rpc_amqp._MsgIdCache()
         self.incoming = []
@@ -395,7 +395,7 @@ class AMQPDriverBase(base.BaseDriver):
     def listen(self, target):
         conn = self._get_connection(pooled=False)
 
-        listener = AMQPListener(self, target, conn)
+        listener = AMQPListener(self, conn)
 
         conn.declare_topic_consumer(target.topic, listener)
         conn.declare_topic_consumer('%s.%s' % (target.topic, target.server),

oslo/messaging/_drivers/base.py

@@ -41,10 +41,9 @@ class IncomingMessage(object):
 @six.add_metaclass(abc.ABCMeta)
 class Listener(object):
 
-    def __init__(self, driver, target):
+    def __init__(self, driver):
         self.conf = driver.conf
         self.driver = driver
-        self.target = target
 
     @abc.abstractmethod
     def poll(self):

oslo/messaging/_drivers/impl_fake.py

@@ -39,15 +39,17 @@ class FakeIncomingMessage(base.IncomingMessage):
 
 class FakeListener(base.Listener):
 
-    def __init__(self, driver, target, exchange):
-        super(FakeListener, self).__init__(driver, target)
+    def __init__(self, driver, exchange, targets):
+        super(FakeListener, self).__init__(driver)
         self._exchange = exchange
+        self._targets = targets
 
     def poll(self):
         while True:
-            (ctxt, message, reply_q) = self._exchange.poll(self.target)
-            if message is not None:
-                return FakeIncomingMessage(self, ctxt, message, reply_q)
+            for target in self._targets:
+                (ctxt, message, reply_q) = self._exchange.poll(target)
+                if message is not None:
+                    return FakeIncomingMessage(self, ctxt, message, reply_q)
             time.sleep(.05)
 
 
@@ -80,8 +82,9 @@ class FakeExchange(object):
 
     def poll(self, target):
         with self._queues_lock:
-            queue = self._get_server_queue(target.topic, target.server)
-            if not queue:
+            if target.server:
+                queue = self._get_server_queue(target.topic, target.server)
+            else:
                 queue = self._get_topic_queue(target.topic)
             return queue.pop(0) if queue else (None, None, None)
 
@@ -152,7 +155,11 @@ class FakeDriver(base.BaseDriver):
         exchange = self._get_exchange(target.exchange or
                                       self._default_exchange)
 
-        return FakeListener(self, target, exchange)
+        listener = FakeListener(self, exchange,
+                                [messaging.Target(topic=target.topic,
+                                                  server=target.server),
+                                 messaging.Target(topic=target.topic)])
+        return listener
 
     def cleanup(self):
         pass

oslo/messaging/_drivers/impl_zmq.py

@@ -846,8 +846,8 @@ class ZmqIncomingMessage(base.IncomingMessage):
 
 class ZmqListener(base.Listener):
 
-    def __init__(self, driver, target):
-        super(ZmqListener, self).__init__(driver, target)
+    def __init__(self, driver):
+        super(ZmqListener, self).__init__(driver)
         self.incoming_queue = moves.queue.Queue()
 
     def dispatch(self, ctxt, version, method, namespace, **kwargs):
@@ -948,7 +948,7 @@ class ZmqDriver(base.BaseDriver):
     def listen(self, target):
         conn = create_connection(self.conf)
 
-        listener = ZmqListener(self, target)
+        listener = ZmqListener(self)
 
         conn.create_consumer(target.topic, listener)
         conn.create_consumer('%s.%s' % (target.topic, target.server),