odataserver/tests/helpers.js

OData server with support for BLOBs

// helpers.js
//------------------------------
//
// 2015-01-15, Jonas Colmsjö
//
//------------------------------
//
// Misc helpers fucntions
//
//
// Using Google JavaScript Style Guide
// http://google-styleguide.googlecode.com/svn/trunk/javascriptguide.xml
//
//------------------------------


var moduleSelf = this;

var h = {};

var http = require('http');
var https = require('https');
var util = require('util');
var h = require('../src/helpers.js');

var CONSTANTS = require('../src/constants.js');
var log = new h.log0(CONSTANTS.testLoggerOptions);

// Measure the latency in the https requests using
// an exponentially smoothed moving average (since it is easy to calculate)
moduleSelf.latency = 0;
moduleSelf.weight = 0.2;
moduleSelf.logIntervall = 100;
moduleSelf.counter = 0;

//
// Helper for making http requests
// -------------------------------

h.httpRequest = function(options, input, done) {
  var _data = '';
  var beforeReq = Date.now();

  var func = function(res) {
    // Keep track of the latency (handy when running the stress tests)
    var receivedRes = Date.now();
    moduleSelf.latency = (receivedRes - beforeReq) * moduleSelf.weight +
      (1 - moduleSelf.weight) * moduleSelf.latency;

    if (moduleSelf.counter++ % moduleSelf.logIntervall === 0) {
      log.log('httpRequest average latency: ' + moduleSelf.latency +
        '(ms)' +
        '[beforeReq: ' + beforeReq + ' receivedRes: ' + receivedRes +
        ' diff: ' + (receivedRes - beforeReq) + ']');
    }

    log.debug('status code:' + res.statusCode + ', headers: ' +
      JSON.stringify(res.headers));

    res.setEncoding('utf8');

    res.on('data', function(chunk) {
      _data += chunk;
    });

    res.on('end', function() {
      done(_data, res.statusCode);
    });
  };

  // Using a self-signed certificate for development and testing
  options.rejectUnauthorized = false;

  if (CONSTANTS.HTTPS_OPTIONS.USE_HTTPS) {
    // use a secure https server
    req = https.request(options, func);
  } else {
    // use a plain old http server
    req = http.request(options, func);
  }

  req.on('error', function(e) {
    log.log('problem with request: ' + e.message);
  });

  if (input !== null) {
    req.write(input);
  }

  req.end();
};

// Check if there is open requests in the event loop and open I/O handles 
h.checkOpen = function() {
  console.log('waiting a while for async operations to complete...');
  setTimeout(function() {
    var requests = process._getActiveRequests();
    var handles = process._getActiveHandles();

    console.log('open requests: ', util.inspect(requests, {colors: true}));
    console.log('open handles: ', util.inspect(handles, {colors: true}));

    console.log('#open requests: ', requests.length,
    ', #open handles: ', handles.length);
  }, 5000);
};

// Exports
// =======

module.exports = h;