PYTHON-2966 Make MongoClient.event_listeners work as expected (#761)

pymongo/mongo_client.py

@@ -895,7 +895,7 @@ class MongoClient(common.BaseObject):
 
         See :mod:`~pymongo.monitoring` for details.
         """
-        return self._event_listeners.event_listeners
+        return self._event_listeners.event_listeners()
 
     @property
     def topology_description(self):

pymongo/monitoring.py

@@ -1318,10 +1318,11 @@ class _EventListeners(object):
 
     def event_listeners(self):
         """List of registered event listeners."""
-        return (self.__command_listeners[:],
-                self.__server_heartbeat_listeners[:],
-                self.__server_listeners[:],
-                self.__topology_listeners[:])
+        return (self.__command_listeners[:] +
+                self.__server_heartbeat_listeners[:] +
+                self.__server_listeners[:] +
+                self.__topology_listeners[:] +
+                self.__cmap_listeners)
 
     def publish_command_start(self, command, database_name,
                               request_id, connection_id, op_id=None,

test/test_client.py

@@ -35,7 +35,7 @@ from bson.codec_options import CodecOptions, TypeEncoder, TypeRegistry
 from bson.son import SON
 from bson.tz_util import utc
 import pymongo
-from pymongo import message, monitoring
+from pymongo import event_loggers, message, monitoring
 from pymongo.command_cursor import CommandCursor
 from pymongo.common import CONNECT_TIMEOUT, _UUID_REPRESENTATIONS
 from pymongo.compression_support import _HAVE_SNAPPY, _HAVE_ZSTD
@@ -463,6 +463,17 @@ class ClientUnitTest(unittest.TestCase):
         with self.assertRaises(InvalidURI):
             MongoClient(ssl=True, tls=False)
 
+    def test_event_listeners(self):
+        c = MongoClient(event_listeners=[], connect=False)
+        self.assertEqual(c.event_listeners, [])
+        listeners = [event_loggers.CommandLogger(),
+                     event_loggers.HeartbeatLogger(),
+                     event_loggers.ServerLogger(),
+                     event_loggers.TopologyLogger(),
+                     event_loggers.ConnectionPoolLogger()]
+        c = MongoClient(event_listeners=listeners, connect=False)
+        self.assertEqual(c.event_listeners, listeners)
+
 
 class TestClient(IntegrationTest):
     def test_multiple_uris(self):

test/test_session.py

@@ -104,7 +104,7 @@ class TestSession(IntegrationTest):
         self.assertLessEqual(used_lsids, current_lsids)
 
     def _test_ops(self, client, *ops):
-        listener = client.event_listeners()[0][0]
+        listener = client.event_listeners[0]
 
         for f, args, kw in ops:
             with client.start_session() as s:
@@ -626,7 +626,7 @@ class TestSession(IntegrationTest):
             lambda cursor: list(cursor))
 
     def _test_unacknowledged_ops(self, client, *ops):
-        listener = client.event_listeners()[0][0]
+        listener = client.event_listeners[0]
 
         for f, args, kw in ops:
             with client.start_session() as s: