lib: fix hashing

lib/sticky-session.js

@@ -1,6 +1,25 @@
 var net = require('net'),
     cluster = require('cluster');
 
+function hash(ip, seed) {
+  var hash =  ip.reduce(function(r, num) {
+    r += parseInt(num, 10);
+    r %= 2147483648;
+    r += (r << 10)
+    r %= 2147483648;
+    r ^= r >> 6;
+    return r;
+  }, seed);
+
+  hash += hash << 3;
+  hash %= 2147483648;
+  hash ^= hash >> 11;
+  hash += hash << 15;
+  hash %= 2147483648;
+
+  return hash >>> 0;
+}
+
 module.exports = function sticky(num, callback) {
   var server;
 
@@ -28,22 +47,13 @@ module.exports = function sticky(num, callback) {
     server = net.createServer(function(c) {
       // Get int31 hash of ip
       var worker,
-          hash = c.remoteAddress.split(/\./g).reduce(function(r, num) {
-            r += num;
-            r += (r << 10) & 2147483647;
-            r ^= r >> 6;
-            return r & 2147483647;
-          }, seed);
-
-      hash += hash << 3;
-      hash ^= hash >> 11;
-      hash += (hash << 15) & 2147483647;
+          ipHash = hash((c.remoteAddress || '').split(/\./g), seed);
 
       // Pause socket (so we won't loose any data)
       c.pause();
 
       // Pass connection to worker
-      worker = workers[hash % workers.length];
+      worker = workers[ipHash % workers.length];
       worker.send('sticky-session:connection', c._handle);
 
       // And detach socket from master process