test-cluster-master-error.js

// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.


var common = require('../common');
var assert = require('assert');
var cluster = require('cluster');

// Cluster setup
if (cluster.isWorker) {
  var http = require('http');
  http.Server(function() {

  }).listen(common.PORT, '127.0.0.1');

} else if (process.argv[2] === 'cluster') {

  var totalWorkers = 2;

  // Send PID to testcase process
  var forkNum = 0;
  cluster.on('fork', function forkEvent(worker) {

    // Send PID
    process.send({
      cmd: 'worker',
      workerPID: worker.process.pid
    });

    // Stop listening when done
    if (++forkNum === totalWorkers) {
      cluster.removeListener('fork', forkEvent);
    }
  });

  // Throw accidently error when all workers are listening
  var listeningNum = 0;
  cluster.on('listening', function listeningEvent() {

    // When all workers are listening
    if (++listeningNum === totalWorkers) {
      // Stop listening
      cluster.removeListener('listening', listeningEvent);

      // throw accidently error
      process.nextTick(function() {
        throw 'accidently error';
      });
    }

  });

  // Startup a basic cluster
  cluster.fork();
  cluster.fork();

} else {
  // This is the testcase

  var fork = require('child_process').fork;

  var isAlive = function(pid) {
    try {
      //this will throw an error if the process is dead
      process.kill(pid, 0);

      return true;
    } catch (e) {
      return false;
    }
  };

  var existMaster = false;
  var existWorker = false;

  // List all workers
  var workers = [];

  // Spawn a cluster process
  var master = fork(process.argv[1], ['cluster'], {silent: true});

  // Handle messages from the cluster
  master.on('message', function(data) {

    // Add worker pid to list and progress tracker
    if (data.cmd === 'worker') {
      workers.push(data.workerPID);
    }
  });

  // When cluster is dead
  master.on('exit', function(code) {

    // Check that the cluster died accidently
    existMaster = (code === 1);

    // Give the workers time to shut down
    setTimeout(checkWorkers, 200);

    function checkWorkers() {
      // When master is dead all workers should be dead to
      var alive = false;
      workers.forEach(function(pid) {
        if (isAlive(pid)) {
          alive = true;
        }
      });

      // If a worker was alive this did not act as expected
      existWorker = !alive;
    }
  });

  process.once('exit', function() {
    var m = 'The master did not die after an error was throwed';
    assert.ok(existMaster, m);
    m = 'The workers did not die after an error in the master';
    assert.ok(existWorker, m);
  });

}