Merge trunk.

1 files changed, 32 insertions, 13 deletions

diff --git a/nova/rpc.py b/nova/rpc.py
index 6363335ea..fe52ad35f 100644
--- a/nova/rpc.py
+++ b/nova/rpc.py
@@ -84,19 +84,6 @@ class Consumer(messaging.Consumer):
         self.failed_connection = False
         super(Consumer, self).__init__(*args, **kwargs)
 
-    # TODO(termie): it would be nice to give these some way of automatically
-    #               cleaning up after themselves
-    def attach_to_tornado(self, io_inst=None):
-        """Attach a callback to tornado that fires 10 times a second"""
-        from tornado import ioloop
-        if io_inst is None:
-            io_inst = ioloop.IOLoop.instance()
-
-        injected = ioloop.PeriodicCallback(
-            lambda: self.fetch(enable_callbacks=True), 100, io_loop=io_inst)
-        injected.start()
-        return injected
-
     def fetch(self, no_ack=None, auto_ack=None, enable_callbacks=False):
         """Wraps the parent fetch with some logic for failed connections"""
         # TODO(vish): the logic for failed connections and logging should be
@@ -124,6 +111,7 @@ class Consumer(messaging.Consumer):
         """Attach a callback to twisted that fires 10 times a second"""
         loop = task.LoopingCall(self.fetch, enable_callbacks=True)
         loop.start(interval=0.1)
+        return loop
 
 
 class Publisher(messaging.Publisher):
@@ -294,6 +282,37 @@ def call(topic, msg):
     return wait_msg.result
 
 
+def call_twisted(topic, msg):
+    """Sends a message on a topic and wait for a response"""
+    LOG.debug("Making asynchronous call...")
+    msg_id = uuid.uuid4().hex
+    msg.update({'_msg_id': msg_id})
+    LOG.debug("MSG_ID is %s" % (msg_id))
+
+    conn = Connection.instance()
+    d = defer.Deferred()
+    consumer = DirectConsumer(connection=conn, msg_id=msg_id)
+
+    def deferred_receive(data, message):
+        """Acks message and callbacks or errbacks"""
+        message.ack()
+        if data['failure']:
+            return d.errback(RemoteError(*data['failure']))
+        else:
+            return d.callback(data['result'])
+
+    consumer.register_callback(deferred_receive)
+    injected = consumer.attach_to_twisted()
+
+    # clean up after the injected listened and return x
+    d.addCallback(lambda x: injected.stop() and x or x)
+
+    publisher = TopicPublisher(connection=conn, topic=topic)
+    publisher.send(msg)
+    publisher.close()
+    return d
+
+
 def cast(topic, msg):
     """Sends a message on a topic without waiting for a response"""
     LOG.debug("Making asynchronous cast...")