added disconnect method and event

lib/cluster.js

@@ -46,12 +46,13 @@ if (process.env.NODE_DEBUG && /cluster/.test(process.env.NODE_DEBUG)) {
 // Used in the master:
 var masterStarted = false;
 var ids = 0;
-var servers = {};
+var serverHandlers = {};
 var workerFilename;
 var workerArgs;
 var workerTotal;
 
 // Used in the worker:
+var serverLisenters = {};
 var queryIds = 0;
 var queryCallbacks = {};
 
@@ -91,6 +92,7 @@ cluster.setupMaster = function(options) {
   workerArgs = options.args || process.argv.slice(2);
   workerTotal = options.workers || os.cpus().length;
 
+  /*
   //This is really bad
   process.on('uncaughtException', function(e) {
     // Quickly try to kill all the workers.
@@ -105,7 +107,7 @@ cluster.setupMaster = function(options) {
     console.error('Please report this bug.');
     process.exit(1);
   });
-
+  */
 };
 
 // Check if a message is internal only
@@ -161,6 +163,8 @@ function handleMessage(message, handle, worker) {
     }
   }
 }
+
+//Messages to the master will be handled using this methods 
 if (cluster.isMaster) {
 
   //Handle online messages from workers
@@ -183,10 +187,10 @@ if (cluster.isMaster) {
     var key = args.join(':');
     var handler;
 
-    if (servers.hasOwnProperty(key)) {
-      handler = servers[key];
+    if (serverHandlers.hasOwnProperty(key)) {
+      handler = serverHandlers[key];
     } else {
-      handler = servers[key] = net._createServerHandle.apply(net, args);
+      handler = serverHandlers[key] = net._createServerHandle.apply(net, args);
     }
 
     //echo callback id, with the fd handler associated with it
@@ -219,6 +223,49 @@ if (cluster.isMaster) {
       worker.send(internalMessage({}, message));
     }
   };
+
+  //Handle disconnect messages from workers
+  messageHandingObject.disconnect = function(message, worker) {
+
+    if (message.state === "setState") {
+      worker.state = "disconnect";
+      worker.suicide = true;
+
+      //Send echo if requested
+      if (requireEcho(message)) {
+        worker.send(internalMessage({}, message));
+      }
+    }
+
+    else if (message.state === "done") {
+      //Send echo if requested before closing channel
+      if (requireEcho(message)) {
+        worker.send(internalMessage({}, message));
+      }
+
+      worker.process._channel.close();
+      worker.emit("disconnect", worker);
+      cluster.emit("disconnect", worker);
+    }
+
+  };
+
+}
+
+//Messages to a worker will be handled using this methods 
+else if (cluster.isWorker) {
+
+  //Handle disconnect messages from master
+  messageHandingObject.disconnect = function(message, worker) {
+    //Run disconnect
+    worker.disconnect();
+
+    //Send echo if requested
+    if (requireEcho(message)) {
+        worker.send(internalMessage({}, message));    
+    }
+  };
+
 }
 
 // Create a worker call there works both for master and worker
@@ -292,6 +339,25 @@ function Worker(env) {
     self.emit('exit', self);
     cluster.emit('death', self);
   });
+
+  //Handle disconnect
+  self.on('disconnect', function () {
+
+    //set state to disconnect
+    self.disconnect = 'disconnect';
+
+    //Make suicide a boolean
+    self.suicide = !!self.suicide;
+
+    //Remove from workers in the master
+    if (cluster.isMaster) {
+      delete cluster.workers[self.workerID];
+    }
+
+    //Emit exit and death
+    self.emit('exit', self);
+    cluster.emit('death', self);
+  });
 
 }
 util.inherits(Worker, EventEmitter);
@@ -338,6 +404,64 @@ Worker.prototype.kill = function() {
   }
 };
 
+// Kill the worker without restarting
+Worker.prototype.disconnect = function() {
+  var self = this;
+
+  if (cluster.isMaster) {
+    //Inform worker that is should disconnect from the master
+    this.send(internalMessage({cmd: 'disconnect'}));
+  } else {
+    //Inform master that about state and suicide and make it emit disconnect
+    this.send(internalMessage({cmd: 'disconnect', state: "setState"}), function () {
+        var item;
+
+        //Predefine closeState
+        var closeState = {master: false};
+        for (item in serverLisenters) {
+            if (serverLisenters.hasOwnProperty(item)) {
+                closeState[item] = false;
+            }
+        }
+
+        //Check closeState
+        var setState = function (name) {
+            return function () {
+                //Set State
+                closeState[name] = true;
+
+                //Check all closeStates
+                var state;
+                for (state in closeState) {
+                    if (closeState.hasOwnProperty(state) && closeState === false) {
+                        return undefined;
+                    }
+                }
+
+                //Emit a disconnect if all closeState are true
+                self.emit('disconnect', self);
+            };
+        };
+
+        //Close TCP connections
+        for (item in serverLisenters) {
+            if (serverLisenters.hasOwnProperty(item)) {
+
+                //Close TCP connection and set closeState when done
+                serverLisenters[item].once('end', setState(item));
+                serverLisenters[item].close();
+            }
+        }
+
+        //Make master emit a disconnect event
+        self.send(internalMessage({cmd: 'disconnect', state: "done"}), function () {
+            //Close connection to the master
+            setState('master')();
+        });
+    });
+  }
+};
+
 // Fork a new worker
 cluster.fork = function(env) {
   // This can only be called from the master.
@@ -402,7 +526,11 @@ cluster._setupWorker = function() {
 cluster._getServer = function(tcpSelf, address, port, addressType, cb) {
   // This can only be called from a worker.
   assert(cluster.isWorker);
-
+
+  //Store tcp instance for later use
+  var key = [address, port, addressType].join(":");
+  serverLisenters[key] = tcpSelf;
+
   //Send a listening message to the master
   tcpSelf.once('listening', function() {
     cluster.worker.state = 'listening';