[api test doc] Expose .fork() through forever for node-specific processes. Currently blocked by nodejs/node-v0.x-archive#2454

Author: indexzero

examples/process-send.js

@@ -0,0 +1,6 @@
+
+setInterval(function () {
+  if (process.send) {
+    process.send({ from: 'child' });
+  }
+}, 1000)

lib/forever/monitor.js

@@ -9,6 +9,7 @@
 var events = require('events'),
     fs = require('fs'),
     path = require('path'),
+    fork = require('child_process').fork,
     spawn = require('child_process').spawn,
     broadway = require('broadway'),
     psTree = require('ps-tree'),
@@ -156,9 +157,17 @@ Monitor.prototype.start = function (restart) {
     self.emit(restart ? 'restart' : 'start', self, self.data);
   });
 
+  function reemit() {
+    self.emit.apply(self, arguments);
+  }
+
+  // Re-emit messages from the child process
+  this.child.on('message', reemit);
+
   child.on('exit', function (code) {
     var spinning = Date.now() - self.ctime < self.minUptime;
     self.warn('Forever detected script exited with code: ' + code);
+    child.removeListener('message', reemit);
 
     function letChildDie() {
       self.running = false;
@@ -200,6 +209,9 @@ Monitor.prototype.start = function (restart) {
 // trying to execute a script with an env: e.g. node myfile.js
 //
 Monitor.prototype.trySpawn = function () {
+  var execPath = process.execPath,
+      forked;
+  
   if (this.command === 'node' || (this.checkFile && !this.childExists)) {
     try {
       var stats = fs.statSync(this.args[0]);
@@ -213,7 +225,14 @@ Monitor.prototype.trySpawn = function () {
   this.spawnWith.cwd = this.cwd || this.spawnWith.cwd;
   this.spawnWith.env = this._getEnv();
 
-  return spawn(this.command, this.args, this.spawnWith);
+  if (this.command === 'node' || this.fork) {
+    process.execPath = this.command;
+    forked = fork(this.options[0], this.options.slice(1), this.spawnWith);
+    process.execPath = execPath;
+    return forked;
+  }
+
+  return spawn(this.command, this.options, this.spawnWith);
 };
 
 //

test/fork-test.js

@@ -0,0 +1,29 @@
+/*
+ * spin-test.js: Tests for spin restarts in forever.
+ *
+ * (C) 2010 Nodejitsu Inc.
+ * MIT LICENCE
+ *
+ */
+
+var assert = require('assert'),
+    path = require('path'),
+    vows = require('vows'),
+    forever = require('../lib/forever');
+
+vows.describe('forever/spin-restart').addBatch({
+  "When using forever": {
+    "and spawning a script that uses `process.send()`": {
+      topic: function () {
+        var script = path.join(__dirname, '..', 'examples', 'process-send.js'),
+            child = new (forever.Monitor)(script, { silent: true, minUptime: 2000, max: 1 });
+
+        child.on('message', this.callback.bind(null, null));
+        child.start();
+      },
+      "should reemit the message correctly": function (err, child, spinning) {
+        console.dir(arguments);
+      }
+    }
+  }
+}).export(module);