cfork

cluster fork and restart easy way.

• Easy fork with worker file path
• Handle worker restart, event it was exit unexpected.
• Auto error log process uncaughtException event

Install

$ npm install cfork --save

Usage

Example

var cfork = require('cfork');
var util = require('util');

cfork({
  exec: '/your/app/worker.js',
  // count: require('os').cpus().length,
})
.on('fork', function (worker) {
  console.warn('[%s] [worker:%d] new worker start', Date(), worker.process.pid);
})
.on('disconnect', function (worker) {
  console.warn('[%s] [master:%s] wroker:%s disconnect, suicide: %s, state: %s.',
    Date(), process.pid, worker.process.pid, worker.suicide, worker.state);
})
.on('exit', function (worker, code, signal) {
  var exitCode = worker.process.exitCode;
  var err = new Error(util.format('worker %s died (code: %s, signal: %s, suicide: %s, state: %s)',
    worker.process.pid, exitCode, signal, worker.suicide, worker.state));
  err.name = 'WorkerDiedError';
  console.error('[%s] [master:%s] wroker exit: %s', Date(), process.pid, err.stack);
})

// if you do not listen to this event
// cfork will output this message to stderr
.on('unexpectedExit', function (worker, code, signal) {
  // logger what you want
});

// if you do not listen to this event
// cfork will listen it and output the error message to stderr
process.on('uncaughtException', function (err) {
  // do what you want
});

// emit when reach refork times limit
.on('reachReforkLimit', function () {
  // do what you want
});

Options

• exec : exec file path
• args : exec arguments
• count : fork worker nums, default is os.cpus().length
• refork : refork when worker disconnect or unexpected exit, default is true
• limit: limit refork times within the duration, default is 60
• duration: default is 60000, one minute (so, the refork times < limit / duration)
• autoCoverage: auto fork with istanbul when running_under_istanbul env set, default is false

License

(The MIT License)

Copyright (c) 2014 - 2015 node-modules and other 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.