Correctly await on_logged_out callbacks

changelog.d/11786.bugfix

@@ -0,0 +1 @@
+Fix a bug introduced in Synapse 1.46.0 that prevented `on_logged_out` module callbacks from being correctly awaited by Synapse.

synapse/handlers/auth.py

@@ -2281,7 +2281,7 @@ async def on_logged_out(
         # call all of the on_logged_out callbacks
         for callback in self.on_logged_out_callbacks:
             try:
-                callback(user_id, device_id, access_token)
+                await callback(user_id, device_id, access_token)
             except Exception as e:
                 logger.warning("Failed to run module API callback %s: %s", callback, e)
                 continue

tests/handlers/test_password_providers.py

@@ -22,11 +22,12 @@
 import synapse
 from synapse.handlers.auth import load_legacy_password_auth_providers
 from synapse.module_api import ModuleApi
-from synapse.rest.client import devices, login
+from synapse.rest.client import devices, login, logout
 from synapse.types import JsonDict
 
 from tests import unittest
 from tests.server import FakeChannel
+from tests.test_utils import make_awaitable
 from tests.unittest import override_config
 
 # (possibly experimental) login flows we expect to appear in the list after the normal
@@ -155,6 +156,7 @@ class PasswordAuthProviderTests(unittest.HomeserverTestCase):
         synapse.rest.admin.register_servlets,
         login.register_servlets,
         devices.register_servlets,
+        logout.register_servlets,
     ]
 
     def setUp(self):
@@ -719,6 +721,25 @@ def custom_auth_no_local_user_fallback_test_body(self):
         channel = self._send_password_login("localuser", "localpass")
         self.assertEqual(channel.code, 400, channel.result)
 
+    def test_on_logged_out(self):
+        """Tests that the on_logged_out callback is called when the user logs out."""
+        self.register_user("rin", "password")
+        tok = self.login("rin", "password")
+
+        on_logged_out = Mock(return_value=make_awaitable(None))
+        self.hs.get_password_auth_provider().on_logged_out_callbacks.append(
+            on_logged_out
+        )
+
+        channel = self.make_request(
+            "POST",
+            "/_matrix/client/v3/logout",
+            {},
+            access_token=tok,
+        )
+        self.assertEqual(channel.code, 200)
+        on_logged_out.assert_called_once()
+
     def _get_login_flows(self) -> JsonDict:
         channel = self.make_request("GET", "/_matrix/client/r0/login")
         self.assertEqual(channel.code, 200, channel.result)