manage reconnections

lib/cartodb/varnish.js

@@ -12,11 +12,26 @@ function VarnishClient(host, port, ready_callback) {
     var ready = false;
     var cmd_callback = null;
     var client = null;
+    var connected = false;
+    var connecting = false;
 
     function connect() {
+        if(connecting) return;
+        connecting = true;
+        console.log("VARNISH: connection");
         ready = false;
+        if(!client) {
             client = net.createConnection(port, host);
+            client.on('connect', function () {
+                console.log("VARNISH: connected");
+                connected = true;
+                connecting = false;
+            });
+        } else {
+            client.connect(port, host);
         }
+    }
+
 
     connect();
 
@@ -45,19 +60,27 @@ function VarnishClient(host, port, ready_callback) {
     });
 
     client.on('close', function() {
+        console.log("[INFO] closed varnish connection");
         self.close();
+        connected = false;
+        connecting = false;
     });
 
     // sends the command to the server
     function _send(cmd, callback) {
       cmd_callback = callback;
+      if(connected) {
         client.write(cmd + '\n');
+      } else {
+        connect();
+      }
     }
 
     // run command if there is no peding response
     // fist param of the callback are the error, null
     // if all went ok
     this.run_cmd = function(cmd, callback) {
+       if(!connected) connect();
        if(!cmd_callback) {
          _send(cmd, callback);
        } else {