From 5614b4dafb2e1dd59fac55fe4e8b29cd4bc3e785 Mon Sep 17 00:00:00 2001
From: Erik Johnston <erik@matrix.org>
Date: Fri, 19 Feb 2016 09:50:54 +0000
Subject: [PATCH] Add presence metrics

---
 synapse/handlers/presence.py | 8 ++++++++
 synapse/util/wheel_timer.py  | 6 ++++++
 2 files changed, 14 insertions(+)

diff --git a/synapse/handlers/presence.py b/synapse/handlers/presence.py
index fb9536cee3..86b94ab84b 100644
--- a/synapse/handlers/presence.py
+++ b/synapse/handlers/presence.py
@@ -44,6 +44,9 @@ logger = logging.getLogger(__name__)
 
 metrics = synapse.metrics.get_metrics_for(__name__)
 
+notified_presence_counter = metrics.register_counter("notified_presence")
+presence_updates_counter = metrics.register_counter("presence_updates")
+
 
 # If a user was last active in the last LAST_ACTIVE_GRANULARITY, consider them
 # "currently_active"
@@ -170,6 +173,8 @@ class PresenceHandler(BaseHandler):
             5000,
         )
 
+        metrics.register_callback("wheel_timer_size", lambda: len(self.wheel_timer))
+
     @defer.inlineCallbacks
     def _on_shutdown(self):
         """Gets called when shutting down. This lets us persist any updates that
@@ -233,7 +238,10 @@ class PresenceHandler(BaseHandler):
 
         # TODO: We should probably ensure there are no races hereafter
 
+        presence_updates_counter.inc_by(len(new_states))
+
         if to_notify:
+            notified_presence_counter.inc_by(len(to_notify))
             yield self._persist_and_notify(to_notify.values())
 
         self.unpersisted_users_changes |= set(s.user_id for s in new_states)
diff --git a/synapse/util/wheel_timer.py b/synapse/util/wheel_timer.py
index 2c9f957616..7412fc57a4 100644
--- a/synapse/util/wheel_timer.py
+++ b/synapse/util/wheel_timer.py
@@ -89,3 +89,9 @@ class WheelTimer(object):
             ret.extend(self.entries.pop(0).queue)
 
         return ret
+
+    def __len__(self):
+        l = 0
+        for entry in self.entries:
+            l += len(entry.queue)
+        return l