Merge "Fix rabbitmq driver with blocking executor"

oslo_messaging/_drivers/amqpdriver.py

@@ -56,6 +56,13 @@ class MessageOperationsHandler(object):
             target=self._process_in_background)
         self._shutdown_thread.daemon = True
 
+        # HACK(sileht): this is set by the server.Server temporary
+        # to not have to rewrite the entire internal API to pass
+        # executor everywhere to make Listener aware of the server
+        # executor. All this hack is only for the blocking executor.
+        # And it's deprecated so...
+        self._executor = None
+
     def stop(self):
         self._shutdown.set()
 
@@ -85,9 +92,16 @@ class MessageOperationsHandler(object):
 
     def do(self, task):
         "Put the task in the queue and waits until the task is completed."
-        event = threading.Event()
-        self._tasks.put((task, event))
-        event.wait()
+        if self._executor is None:
+            raise RuntimeError("Unexpected error, no executor is setuped")
+        elif self._executor == "blocking":
+            # NOTE(sileht): Blocking will hang forever if we waiting the
+            # polling thread
+            task()
+        else:
+            event = threading.Event()
+            self._tasks.put((task, event))
+            event.wait()
 
 
 class AMQPIncomingMessage(base.RpcIncomingMessage):

oslo_messaging/server.py

@@ -417,6 +417,18 @@ class MessageHandlingServer(service.ServiceBase, _OrderedTaskRunner):
         except driver_base.TransportDriverError as ex:
             raise ServerListenError(self.target, ex)
 
+        # HACK(sileht): We temporary pass the executor to the rabbit
+        # listener to fix a race with the deprecated blocking executor.
+        # We do this hack because this is need only for 'synchronous'
+        # executor like blocking. And this one is deprecated. Making
+        # driver working in an sync and an async way is complicated
+        # and blocking have 0% tests coverage.
+        if hasattr(self.listener, '_poll_style_listener'):
+            l = self.listener._poll_style_listener
+            if hasattr(l, "_message_operations_handler"):
+                l._message_operations_handler._executor = (
+                    self.executor_type)
+
         self.listener.start(self._on_incoming)
 
     @ordered(after='start')