Process Management Tool | Auto Restarts | Advanced Events | And More Warning 1.1.1 Breaking API Changes

Revive

A process management tool. Events, status, cluster, and automatic restarts.

Install

npm install revive

Example

const Revive = require('revive');

const options = {
	name: 'test',

	cmd: process.execPath,

	arg: ['app.js'],
	env: { PORT: 8000 },
	cwd: '/home/user/code/node/app/.',

	cluster: true,
	instances: 2,

	stdout: '/logs/stdout.log',
	stderr: '/logs/stderr.log',

	sleepTime: 1000,
	crashTime: 6 * 1000,
	maxCrashCount: 1000
};

const monitor = Revive(options);

monitor.on('start', function () {
	console.log(monitor.toJSON());
});

monitor.start();

Options

• name: String Defaults to null the name of the process.

• arg: Array, String Defaults to null arguments or node script.

• cwd: String Defaults to process.cwd() the current working directory.

• cmd: String Defaults to process.execPath the systems absolute executable/node path.

• cluster: Boolean Defaults to false.

• instances: Number Defaults to Os.cpus().length if cluster is set to true

• stdout: String Defaults to 'pipe' otherwise a file path. If a path is provided than this event will not fire.

• stderr: String Defaults to 'pipe' otherwise a file path. If a path is provided than this event will not fire.

• sleepTime: Array, Number Defaults to 1000 in milliseconds to sleep between start after a crash.

• crashTime: Number Defaults to 60000ms. The time until the maxCrashCount resets. So if 1000 crashes happen in 60s then the process will exit.

• maxCrashCount: Number Defaults to 1000 crashes. A crash is triggered and the process exited at nth + 1.

• env: {} Environment variables for the process.

• data: {} A custom object for you.

API

• monitor.start() Starts the monitor

• monitor.stop() Stops the monitor (kills the process if its running with SIGKILL).

• monitor.restart() Restarts the monitor by stopping then starting (process must be started).

• monitor.toJSON() Creates a stringyifiable object. The object returns stats and data about the process.

Cluster Events

• monitor.on('status', callback)

• monitor.on('start', callback) Starts the process. Warning async so process may not be available immediately.

• monitor.on('stop', callback) The process and it's tree is sent a SIGTERM signal. If the process does not terminate after ten seconds then the process is sent a SIGKILL signal.

• monitor.on('restart', callback) Same as stopping then starting or vice versa.

• monitor.on('stdout', callback) Emits an stdout. Only available if no Options.stdout is pipe.

  • Stdout Parameter the stdout message.

• monitor.on('stderr', callback) Emits an stderr. Only available if no Options.stderr is pipe.

  • Stderr Parameter the stderr message.

• monitor.on('error', callback) Emits when the process could not spawn, kill, or a message failed.

  • Error Parameter the error message.

• monitor.on('exit', callback) The process has exited.

  • Code The numeric exit code
  • Signal The string signal

Instance Events

• monitor.on('reload', callback) Zero downtime restart if cluster is set to true and instances is greater than one.

• monitor.on('sleep', callback) Triggered when process crashes and enters sleep.

• monitor.on('crash', callback) Triggered when the process crashes.

Issues

Immediate start then stop execution does not send the signals. This could be a problem with node.js.