Use autocommit connection to LISTEN

This is needed to receive notification in a timely manner.

issue9966
review333541002

trytond/bus.py

@@ -149,12 +149,11 @@ class LongPollingBus:
             raise NotImplementedException
 
         logger.info("listening on channel '%s'", cls._channel)
-        conn = db.get_connection()
+        conn = db.get_connection(autocommit=True)
         pid = os.getpid()
         try:
             cursor = conn.cursor()
             cursor.execute('LISTEN "%s"' % cls._channel)
-            conn.commit()
 
             cls._messages[database] = messages = _MessageQueue(_cache_timeout)
 

trytond/cache.py

@@ -293,13 +293,12 @@ class MemoryCache(BaseCache):
             raise NotImplementedError
 
         logger.info("listening on channel '%s' of '%s'", cls._channel, dbname)
-        conn = database.get_connection()
+        conn = database.get_connection(autocommit=True)
         pid = os.getpid()
         current_thread = threading.current_thread()
         try:
             cursor = conn.cursor()
             cursor.execute('LISTEN "%s"' % cls._channel)
-            conn.commit()
 
             while cls._listener.get((pid, dbname)) == current_thread:
                 readable, _, _ = select.select([conn], [], [])