add .fork option (mafintosh#18)

* add .fork option

* add .silent

* forward ipc messages

README.md

@@ -23,7 +23,8 @@ var monitor = respawn(['node', 'server.js'], {
  // or -1 for infinite restarts
  sleep:1000, // time to sleep between restarts,
  kill:30000, // wait 30s before force killing after stopping
- stdio: [...] // forward stdio options
+ stdio: [...], // forward stdio options
+ fork: true // fork instead of spawn
 })
 
 monitor.start() // spawn and watch

index.js

@@ -1,5 +1,6 @@
 var events = require('events')
 var spawn = require('child_process').spawn
+var fork = require('child_process').fork
 var exec = require('child_process').exec
 var ps = require('ps-tree')
 var util = require('util')
@@ -51,7 +52,11 @@ var Monitor = function(command, opts) {
  this.stdio = opts.stdio
  this.stdout = opts.stdout
  this.stderr = opts.stderr
+ this.silent = opts.silent
  this.windowsVerbatimArguments = opts.windowsVerbatimArguments
+ this.spawnFn = opts.fork
+ ? fork
+ : spawn
 
  this.crashed = false
  this.sleep = typeof opts.sleep === 'function' ? opts.sleep : defaultSleep(opts.sleep)
@@ -106,12 +111,13 @@ Monitor.prototype.start = function() {
 
  var loop = function() {
  var cmd = typeof self.command === 'function' ? self.command() : self.command
- var child = spawn(cmd[0], cmd.slice(1), {
+ var child = self.spawnFn(cmd[0], cmd.slice(1), {
  cwd: self.cwd,
  env: xtend(process.env, self.env),
  uid: self.uid,
  gid: self.gid,
  stdio: self.stdio,
+ silent: self.silent,
  windowsVerbatimArguments: self.windowsVerbatimArguments
  })
 
@@ -143,6 +149,10 @@ Monitor.prototype.start = function() {
  }
  }
 
+ child.on('message', function(message) {
+ self.emit('message', message)
+ })
+
  var clear = function() {
  if (self.child !== child) return false
  self.child = null

test/apps/fork.js

@@ -0,0 +1 @@
+process.send({ foo: 'bar' })

test/index.js

@@ -7,6 +7,7 @@ var crash = path.join(__dirname, 'apps', 'crash.js')
 var run = path.join(__dirname, 'apps', 'run.js')
 var hello = path.join(__dirname, 'apps', 'hello-world.js')
 var env = path.join(__dirname, 'apps', 'env.js')
+var fork = path.join(__dirname, 'apps', 'fork.js')
 var node = process.execPath
 
 test('restart', function(t) {
@@ -290,3 +291,23 @@ test('restart using restart strategy function', function (t) {
  })
  mon.start()
 })
+
+test('fork', function(t) {
+ t.plan(1)
+
+ var mon = respawn([fork], {fork:true, maxRestarts:1, sleep:1})
+ var messages = []
+
+ mon.on('message', function(message) {
+ messages.push(message)
+ })
+
+ mon.on('stop', function() {
+ t.deepEqual(messages, [
+ {foo: 'bar'},
+ {foo: 'bar'}
+ ])
+ })
+
+ mon.start()
+})