first commit

portchecker.js

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+/** 
+* LICENSE MIT
+* (C) Daniel Zelisko
+* http://github.com/danielzzz/node-portchecker
+*
+* a simple tcp port checker
+* Use it for checking if a service is up or to find available ports on a machine
+*/
+
+var sys = require('sys');
+var net = require('net');
+
+
+
+
+// start port, last port, host, callback
+exports.getFirstAvailable = function (p, m, host, callback) {
+    var notFree = false;
+    var conn = net.createConnection(p, host);
+    var onClose = function() {
+        if (notFree) {conn.connect(p); notFree = false; return;}
+        delete conn;
+        callback(p, host);    
+    };
+
+    var onOpen = function() {
+        notFree = true;
+        console.log(host+":"+p+" is taken");
+
+        //not found
+        if (p >= m) { 
+            conn.removeListener('close', onClose);
+            delete conn;
+            callback(-1, host); 
+
+        }
+
+        p++;
+        conn.end();
+    };
+
+    conn.on('close', onClose);
+    conn.on('error', function() {});
+
+    conn.on('connect', onOpen);
+
+
+}
+
+//usage example: find first available port between 2000 and 2100 on localhost
+this.getFirstAvailable(80, 8090, 'localhost', function(p, host) { console.log(host+":"+p+" is free");});