node-daemontools

Control daemontools (svc, svstat) with Node

Installation

npm install daemontools

Example

var daemontools = require('daemontools');

// check nginx status
daemontools.svstat('/service/nginx', function(err, stats) {
  if (err)
    throw err; // permission denied, service not found, etc.

  console.dir(stats);
});

// restart apache
daemontools.restart('/service/apache', function(err) {
  if (err)
    throw err; // permission denied, service not found, etc.

  // => service restarted
});

This example will show the current status of the nginx daemon, as well as restart the apache service.

Usage

daemontools.svstat(file, cb)

A function that mimics svstat(1) by reading a daemons status file and extracting meaningful data.

• file - a service file
• cb - a function in the form of function(err, stats)

example:

daemontools.svstat('/service/nginx', function(err, stats) {
  console.dir(stats);
})

output

{
  "name": "nginx",
  "path": "/service/nginx",
  "pid": 3985,
  "up": true,
  "paused": false,
  "want": "up",
  "changed": "2014-07-26T06:09:42.000Z",
  "elapsed": 5
}

daemontools.svc(file, data, cb)

mimics svc(1) by writing to a daemons control file

• file - a service file
• data - a string to pass to the control file, like d for down, u for up, etc.
• cb - a function in the form of function(err) (passed to fs.appendFile)

example:

daemontools.svc('/service/nginx', 'dx', function(err) {
  // => nginx is now disabled and exited
})

convenience functions

The following functions have been defined to call daemontools.svc with predefined arguments for convenience.

All functions take a file as the first argument and a callback as the second. The names were modeled after the arguments supported by the svc(1) program - http://cr.yp.to/daemontools/svc.html.

• daemontools.up(file, cb)
• daemontools.down(file, cb)
• daemontools.once(file, cb)
• daemontools.term(file, cb)
• daemontools.kill(file, cb)
• daemontools.exit(file, cb)
• daemontools.pause(file, cb)
• daemontools.cont(file, cb)
• daemontools.hup(file, cb)
• daemontools.int(file, cb)
• daemontools.alarm(file, cb)

And the following aliases have been defined

• daemontools.start(file, cb) - same as up
• daemontools.stop(file, cb) - same as down
• daemontools.restart(file, cb) - same as term

License

LICENSE - "MIT License" Copyright (c) 2013-2014 Voxer LLC. All rights reserved.

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.