text: /*
   *
   * Copyright 2015, Google Inc.
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are
   * met:
   *
   *     * Redistributions of source code must retain the above copyright
   * notice, this list of conditions and the following disclaimer.
   *     * Redistributions in binary form must reproduce the above
   * copyright notice, this list of conditions and the following disclaimer
   * in the documentation and/or other materials provided with the
   * distribution.
   *     * Neither the name of Google Inc. nor the names of its
   * contributors may be used to endorse or promote products derived from
   * this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
   * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
   * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   *
   */
  
  'use strict';
  
  var grpc = require('..');
  var testProto = grpc.load(__dirname + '/../interop/test.proto').grpc.testing;
  var _ = require('lodash');
  var interop_server = require('../interop/interop_server.js');
  
  function runTest(iterations, callback) {
    var testServer = interop_server.getServer(0, false);
    testServer.server.listen();
    var client = new testProto.TestService('localhost:' + testServer.port,
                                           grpc.Credentials.createInsecure());
  
    function runIterations(finish) {
      var start = process.hrtime();
      var intervals = [];
      function next(i) {
        if (i >= iterations) {
          testServer.server.shutdown();
          var totalDiff = process.hrtime(start);
          finish({
            total: totalDiff[0] * 1000000 + totalDiff[1] / 1000,
            intervals: intervals
          });
        } else{
          var deadline = new Date();
          deadline.setSeconds(deadline.getSeconds() + 3);
          var startTime = process.hrtime();
          client.emptyCall({}, function(err, resp) {
            var timeDiff = process.hrtime(startTime);
            intervals[i] = timeDiff[0] * 1000000 + timeDiff[1] / 1000;
            next(i+1);
          }, {}, deadline);
        }
      }
      next(0);
    }
  
    function warmUp(num) {
      var pending = num;
      function startCall() {
        client.emptyCall({}, function(err, resp) {
          pending--;
          if (pending === 0) {
            runIterations(callback);
          }
        });
      }
      for (var i = 0; i < num; i++) {
        startCall();
      }
    }
    warmUp(100);
  }
  
  function percentile(arr, pct) {
    if (pct > 99) {
      pct = 99;
    }
    if (pct < 0) {
      pct = 0;
    }
    var index = Math.floor(arr.length * pct / 100);
    return arr[index];
  }
  
  if (require.main === module) {
    var count;
    if (process.argv.length >= 3) {
      count = process.argv[2];
    } else {
      count = 100;
    }
    runTest(count, function(results) {
      var sorted_intervals = _.sortBy(results.intervals, _.identity);
      console.log('count:', count);
      console.log('total time:', results.total, 'us');
      console.log('median:', percentile(sorted_intervals, 50), 'us');
      console.log('90th percentile:', percentile(sorted_intervals, 90), 'us');
      console.log('95th percentile:', percentile(sorted_intervals, 95), 'us');
      console.log('99th percentile:', percentile(sorted_intervals, 99), 'us');
      console.log('QPS:', (count / results.total) * 1000000);
    });
  }
  
  module.exports = runTest;
  