From a81f1408807683d212b7bf3c4f5f36df4b0e0d33 Mon Sep 17 00:00:00 2001
From: Erik Johnston <erik@matrix.org>
Date: Wed, 22 Aug 2018 10:11:21 +0100
Subject: [PATCH] Add assert to ensure handler is only run on master

---
 synapse/handlers/profile.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/synapse/handlers/profile.py b/synapse/handlers/profile.py
index ec9cb1f50c..278f131d5e 100644
--- a/synapse/handlers/profile.py
+++ b/synapse/handlers/profile.py
@@ -282,6 +282,8 @@ class MasterProfileHandler(WorkerProfileHandler):
     def __init__(self, hs):
         super(MasterProfileHandler, self).__init__(hs)
 
+        assert hs.config.worker_app is None
+
         self.clock.looping_call(
             self._start_update_remote_profile_cache, self.PROFILE_UPDATE_MS,
         )