From 45fbe4ff67b7a7b51cbe474572947dc8e7b8c0da Mon Sep 17 00:00:00 2001
From: Ilya Zhuravlev <whatever@xyz.is>
Date: Thu, 2 Nov 2017 22:49:43 +0300
Subject: [PATCH 1/3] Fix appservices being backlogged and not receiving new
 events due to a bug in notify_interested_services

---
 synapse/handlers/appservice.py | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/synapse/handlers/appservice.py b/synapse/handlers/appservice.py
index 05af54d31b..5ce752a196 100644
--- a/synapse/handlers/appservice.py
+++ b/synapse/handlers/appservice.py
@@ -74,7 +74,7 @@ class ApplicationServicesHandler(object):
                 limit = 100
                 while True:
                     upper_bound, events = yield self.store.get_new_events_for_appservice(
-                        upper_bound, limit
+                        self.current_max, limit
                     )
 
                     if not events:
@@ -105,9 +105,6 @@ class ApplicationServicesHandler(object):
                             )
 
                     yield self.store.set_appservice_last_pos(upper_bound)
-
-                    if len(events) < limit:
-                        break
             finally:
                 self.is_processing = False
 

From 8a4a0ddea60260014ff09eb0a72b9e30fe43c9e8 Mon Sep 17 00:00:00 2001
From: Ilya Zhuravlev <whatever@xyz.is>
Date: Thu, 2 Nov 2017 23:11:28 +0300
Subject: [PATCH 2/3] Fix appservice tests to account for new behavior of
 notify_interested_services

---
 tests/handlers/test_appservice.py | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/tests/handlers/test_appservice.py b/tests/handlers/test_appservice.py
index 7fe88172c0..a667fb6f0e 100644
--- a/tests/handlers/test_appservice.py
+++ b/tests/handlers/test_appservice.py
@@ -53,7 +53,10 @@ class AppServiceHandlerTestCase(unittest.TestCase):
             type="m.room.message",
             room_id="!foo:bar"
         )
-        self.mock_store.get_new_events_for_appservice.return_value = (0, [event])
+        self.mock_store.get_new_events_for_appservice.side_effect = [
+            (0, [event]),
+            (0, [])
+        ]
         self.mock_as_api.push = Mock()
         yield self.handler.notify_interested_services(0)
         self.mock_scheduler.submit_event_for_as.assert_called_once_with(
@@ -75,7 +78,10 @@ class AppServiceHandlerTestCase(unittest.TestCase):
         )
         self.mock_as_api.push = Mock()
         self.mock_as_api.query_user = Mock()
-        self.mock_store.get_new_events_for_appservice.return_value = (0, [event])
+        self.mock_store.get_new_events_for_appservice.side_effect = [
+            (0, [event]),
+            (0, [])
+        ]
         yield self.handler.notify_interested_services(0)
         self.mock_as_api.query_user.assert_called_once_with(
             services[0], user_id
@@ -98,7 +104,10 @@ class AppServiceHandlerTestCase(unittest.TestCase):
         )
         self.mock_as_api.push = Mock()
         self.mock_as_api.query_user = Mock()
-        self.mock_store.get_new_events_for_appservice.return_value = (0, [event])
+        self.mock_store.get_new_events_for_appservice.side_effect = [
+            (0, [event]),
+            (0, [])
+        ]
         yield self.handler.notify_interested_services(0)
         self.assertFalse(
             self.mock_as_api.query_user.called,

From d46386d57e4756e3bd5ca6ed17337d54e73dbbbf Mon Sep 17 00:00:00 2001
From: Ilya Zhuravlev <whatever@xyz.is>
Date: Tue, 7 Nov 2017 22:23:22 +0300
Subject: [PATCH 3/3] Remove useless assignment in notify_interested_services

---
 synapse/handlers/appservice.py | 1 -
 1 file changed, 1 deletion(-)

diff --git a/synapse/handlers/appservice.py b/synapse/handlers/appservice.py
index 5ce752a196..543bf28aec 100644
--- a/synapse/handlers/appservice.py
+++ b/synapse/handlers/appservice.py
@@ -70,7 +70,6 @@ class ApplicationServicesHandler(object):
         with Measure(self.clock, "notify_interested_services"):
             self.is_processing = True
             try:
-                upper_bound = self.current_max
                 limit = 100
                 while True:
                     upper_bound, events = yield self.store.get_new_events_for_appservice(