From a8c8e4efd4055be316c2b38624e7afd77c57b971 Mon Sep 17 00:00:00 2001
From: Erik Johnston <erik@matrix.org>
Date: Tue, 11 Apr 2017 15:34:55 +0100
Subject: [PATCH] Comment

---
 synapse/federation/send_queue.py        | 8 +++++++-
 synapse/federation/transaction_queue.py | 2 ++
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/synapse/federation/send_queue.py b/synapse/federation/send_queue.py
index 7e52a55eda..19cb757acc 100644
--- a/synapse/federation/send_queue.py
+++ b/synapse/federation/send_queue.py
@@ -191,9 +191,15 @@ class FederationRemoteSendQueue(object):
         self.notifier.on_new_replication_data()
 
     def send_presence(self, states):
-        """As per TransactionQueue"""
+        """As per TransactionQueue
+
+        Args:
+            states (list(UserPresenceState))
+        """
         pos = self._next_pos()
 
+        # We only want to send presence for our own users, so lets always just
+        # filter here just in case.
         local_states = filter(lambda s: self.is_mine_id(s.user_id), states)
 
         self.presence_map.update({state.user_id: state for state in local_states})
diff --git a/synapse/federation/transaction_queue.py b/synapse/federation/transaction_queue.py
index 08ceda31a6..260a472255 100644
--- a/synapse/federation/transaction_queue.py
+++ b/synapse/federation/transaction_queue.py
@@ -251,6 +251,8 @@ class TransactionQueue(object):
 
         # First we queue up the new presence by user ID, so multiple presence
         # updates in quick successtion are correctly handled
+        # We only want to send presence for our own users, so lets always just
+        # filter here just in case.
         self.pending_presence.update({
             state.user_id: state for state in states
             if self.is_mine_id(state.user_id)
-- 
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