chiehwen / node-supervisor

node-supervisor

A little supervisor script for nodejs. It runs your program, and watches for code changes, so you can have hot-code reloading-ish behavior, without worrying about memory leaks and making sure you clean up all the inter-module references, and without a whole new require system.

node-supervisor -?

Node Supervisor is used to restart programs when they crash.
It can also be used to restart programs when a *.js file changes.

Usage:
  supervisor [options] <program>
  supervisor [options] -- <program> [args ...]

Required:
  <program>
    The program to run.

Options:
  -w|--watch <watchItems>
    A comma-delimited list of folders or js files to watch for changes.
    When a change to a js file occurs, reload the program
    Default is '.'

  -i|--ignore <ignoreItems>
    A comma-delimited list of folders to ignore for changes.
    No default

  -p|--poll-interval <milliseconds>
    How often to poll watched files for changes.
    Defaults to Node default.

  -e|--extensions <extensions>
    Specific file extensions to watch in addition to defaults.
    Used when --watch option includes folders
    Default is 'node|js'

  -x|--exec <executable>
    The executable that runs the specified program.
    Default is 'node'

  --debug
    Start node with --debug flag.

  --debug-brk
    Start node with --debug-brk flag.

  -n|--no-restart-on error|exit
    Don't automatically restart the supervised program if it ends.
    Supervisor will wait for a change in the source files.
    If "error", an exit code of 0 will still restart.
    If "exit", no restart regardless of exit code.

  -h|--help|-?
    Display these usage instructions.

  -q|--quiet
    Suppress DEBUG messages

Examples:
  supervisor myapp.js
  supervisor myapp.coffee
  supervisor -w scripts -e myext -x myrunner myapp
  supervisor -w lib,server.js,config.js server.js
  supervisor -- server.js -h host -p port

Simple Install

Install npm, and then do this:

npm install supervisor -g

You don't even need to download or fork this repo at all.

Fancy Install

Get this code, install npm, and then do this:

npm link

todo

1. Re-attach to a process by pid. If the supervisor is backgrounded, and then disowned, the child will keep running. At that point, the supervisor may be killed, but the child will keep on running. It'd be nice to have two supervisors that kept each other up, and could also perhaps run a child program.
2. Run more types of programs than just "node blargh.js".
3. Be able to run more than one program, so that you can have two supervisors supervise each other, and then also keep some child server up.
4. When watching, it'd be good to perhaps bring up a new child and then kill the old one gently, rather than just crashing the child abruptly.
5. Keep the pid in a safe place, so another supervisor can pull it out if told to supervise the same program.
6. It'd be pretty cool if this program could be run just like doing node blah.js, but could somehow "know" which files had been loaded, and restart whenever a touched file changes.