From 80609743440467a69c4bdcd111c60d84f617d6c4 Mon Sep 17 00:00:00 2001
From: Erik Johnston <erik@matrix.org>
Date: Fri, 9 Jun 2017 16:40:52 +0100
Subject: [PATCH] Fix replication

---
 synapse/replication/slave/storage/events.py | 2 +-
 synapse/storage/state.py                    | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/synapse/replication/slave/storage/events.py b/synapse/replication/slave/storage/events.py
index 6cd3a843df..f0a367aa9b 100644
--- a/synapse/replication/slave/storage/events.py
+++ b/synapse/replication/slave/storage/events.py
@@ -108,7 +108,7 @@ class SlavedEventStore(BaseSlavedStore):
     get_current_state_ids = (
         StateStore.__dict__["get_current_state_ids"]
     )
-    get_state_group_delta = DataStore.get_state_group_delta.__func__
+    get_state_group_delta = StateStore.__dict__["get_state_group_delta"]
     _get_joined_hosts_cache = RoomMemberStore.__dict__["_get_joined_hosts_cache"]
     has_room_changed_since = DataStore.has_room_changed_since.__func__
 
diff --git a/synapse/storage/state.py b/synapse/storage/state.py
index 24503cd5aa..d1e679719b 100644
--- a/synapse/storage/state.py
+++ b/synapse/storage/state.py
@@ -37,7 +37,7 @@ class _GetStateGroupDelta(namedtuple("_GetStateGroupDelta", ("prev_group", "delt
     __slots__ = []
 
     def __len__(self):
-        return len(self.delta_ids) if self.delta_ids else None
+        return len(self.delta_ids) if self.delta_ids else 0
 
 
 class StateStore(SQLBaseStore):
-- 
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