From 3f7a31d3663049eeab6fff90e18d060966c51853 Mon Sep 17 00:00:00 2001
From: "Paul \"LeoNerd\" Evans" <paul@matrix.org>
Date: Mon, 16 Mar 2015 18:31:29 +0000
Subject: [PATCH] Add a DistributionMetric to HTTP request/response processing
 time in the server

---
 synapse/http/server.py | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/synapse/http/server.py b/synapse/http/server.py
index f1376ee24..dee49b9e1 100644
--- a/synapse/http/server.py
+++ b/synapse/http/server.py
@@ -46,6 +46,11 @@ outgoing_responses_counter = metrics.register_counter(
     labels=["method", "code"],
 )
 
+response_timer = metrics.register_distribution(
+    "response_time",
+    labels=["method", "servlet"]
+)
+
 
 class HttpServer(object):
     """ Interface for registering callbacks on a HTTP server
@@ -169,6 +174,10 @@ class JsonResource(HttpServer, resource.Resource):
                 code, response = yield callback(request, *args)
 
                 self._send_response(request, code, response)
+                response_timer.inc_by(
+                    self.clock.time_msec() - start, request.method, servlet_classname
+                )
+
                 return
 
             # Huh. No one wanted to handle that? Fiiiiiine. Send 400.