server/web/middlewares/pending-request.js

   1 'use strict';
   2
   3 var onHeaders = require('on-headers');
   4 var env = require('gitter-web-env');
   5 var logger = env.logger;
   6 var config = env.config;
   7
   8 var statsd = env.createStatsClient({
   9   prefix: config.get('stats:statsd:prefix'),
  10   includeNodeVersionTags: true
  11 });
  12
  13 var TIMEOUT = 60 * 1000;
  14
  15 function getRouteTag(req) {
  16   // This is put here by the identify-route middleware
  17   if (req.routeIdentifier) {
  18     return req.routeIdentifier;
  19   }
  20
  21   // Fallback to the old method...
  22   var path = req.route && req.route.path;
  23   if (!path) {
  24     return;
  25   }
  26
  27   path = path
  28     .replace(/(\.:format\?|\([^\)]*\))/g, '')
  29     .replace(/:/g, '_')
  30     .replace(/[^\w\-\/]/g, '');
  31
  32   return path;
  33 }
  34
  35 function getUserId(req) {
  36   var user = req.user;
  37   if (!user) return;
  38
  39   return user.id || user._id; // Learn objects or not
  40 }
  41
  42 function getClientId(req) {
  43   var authInfo = req.authInfo;
  44   if (!authInfo) return;
  45   var client = authInfo.client;
  46   if (!client) return;
  47   return client.id || client._id;
  48 }
  49
  50 module.exports = function(req, res, next) {
  51   var timeout;
  52
  53   function reportDroppedRequest() {
  54     var userId = getUserId(req);
  55     var clientId = getClientId(req);
  56     var routeTag = getRouteTag(req);
  57     var method = req.method;
  58
  59     logger.warn('HTTP request still pending after ' + TIMEOUT + 'ms', {
  60       routeIdentifier: routeTag,
  61       userId: userId,
  62       clientId: clientId,
  63       method: method,
  64       path: req.originalUrl,
  65       body: req.body
  66     });
  67
  68     var tags = ['method:' + method];
  69     if (routeTag) {
  70       tags.push('route:' + routeTag);
  71     }
  72
  73     statsd.increment('http.request.pending', 1, tags);
  74   }
  75
  76   function clearDroppedRequestTimeout() {
  77     clearTimeout(timeout);
  78   }
  79
  80   timeout = setTimeout(reportDroppedRequest, TIMEOUT);
  81
  82   onHeaders(res, clearDroppedRequestTimeout);
  83   next();
  84 };