From 1ffb64083358e4a586b0433d5878eef7cd42ad9b Mon Sep 17 00:00:00 2001
From: Tyler Renelle <tylerrenelle@gmail.com>
Date: Tue, 14 Oct 2014 15:10:13 -0600
Subject: [PATCH] tmp(memleak): temporary memleak measure to check avg
 response-time every 3mins. If >650ms (high mem) or ==0 (blackout), restart

---
 config.json.example |  2 ++
 src/middleware.js   | 23 +++++++++++++++++++++++
 2 files changed, 25 insertions(+)

diff --git a/config.json.example b/config.json.example
index 4078868cec..821bb91fc3 100644
--- a/config.json.example
+++ b/config.json.example
@@ -17,6 +17,8 @@
     "STRIPE_API_KEY":"aaaabbbbccccddddeeeeffff00001111",
     "STRIPE_PUB_KEY":"22223333444455556666777788889999",
     "NEW_RELIC_LICENSE_KEY":"NEW_RELIC_LICENSE_KEY",
+    "NEW_RELIC_APPLICATION_ID":"NEW_RELIC_APPLICATION_ID",
+    "NEW_RELIC_API_KEY":"NEW_RELIC_API_KEY",
     "GA_ID": "GA_ID",
     "PAYPAL_USERNAME": "PAYPAL_USERNAME",
     "PAYPAL_PASSWORD": "PAYPAL_PASSWORD",
diff --git a/src/middleware.js b/src/middleware.js
index 409f829668..1c9b723b52 100644
--- a/src/middleware.js
+++ b/src/middleware.js
@@ -9,6 +9,8 @@ var domainMiddleware = require('domain-middleware');
 var cluster = require('cluster');
 var i18n = require('./i18n.js');
 var shared = require('habitrpg-shared');
+var request = require('request');
+var moment = require('moment');
 
 module.exports.apiThrottle = function(app) {
   if (nconf.get('NODE_ENV') !== 'production') return;
@@ -29,6 +31,27 @@ module.exports.apiThrottle = function(app) {
 }
 
 module.exports.domainMiddleware = function(server,mongoose) {
+  if (nconf.get('NODE_ENV')=='production') {
+    var mins = 3;
+
+    //// Detect memory leak as high memory usage on the system. Tried this on prod for a few days, seems we can get blacked out even *without* memory being maxed.
+    //setInterval(function(){
+    //  if (os.freemem() / os.totalmem() < 0.3) throw 'Memory leak';
+    //}, mins*60*1000);
+
+    setInterval(function(){
+      // see https://docs.newrelic.com/docs/apm/apis/api-v2-examples/average-response-time-examples-api-v2, https://rpm.newrelic.com/api/explore/applications/data
+      request({
+        //url: 'https://api.newrelic.com/v2/applications/APPLICATION_ID/metrics/data.json?names[]=HttpDispatcher&values[]=average_call_time&values[]=call_count&from=2014-10-14T2014-03-01T20:59:00+00:00:44:00+00:00&to=2014-10-14Tto=2014-03-01T21:59:00+00:00:14:00+00:00&summarize=true',
+        url: 'https://api.newrelic.com/v2/applications/'+nconf.get('NEW_RELIC_APPLICATION_ID')+'/metrics/data.json?names[]=HttpDispatcher&values[]=average_response_time&from='+moment().subtract({minutes:mins}).utc().format()+'&to='+moment().utc().format()+'&summarize=true',
+        headers: {'X-Api-Key': nconf.get('NEW_RELIC_API_KEY')}
+      }, function(err, response, body){
+        var avgResponseTime = JSON.parse(body).metric_data.metrics[0].timeslices[0].values.average_response_time;
+        if (avgResponseTime > 650 || avgResponseTime == 0) throw 'Memory leak';
+      })
+    }, mins*60*1000);
+  }
+
   return domainMiddleware({
     server: {
       close:function(){