Only measure latency when websocket seems idle

plugins/c9.vfs.client/vfs.ping.js

@@ -9,6 +9,7 @@ define(function(require, exports, module) {
         var Plugin = imports.Plugin;
         var c9 = imports.c9;
         var ext = imports.ext;
+        var vfs = imports.vfs;
 
         /***** Initialization *****/
 
@@ -61,6 +62,9 @@ define(function(require, exports, module) {
             }
 
             if (!api) return callback(new Error("Client is offline"));
+            
+            if (!vfs.isIdle())
+                return vfs.connection.once("message", ping.bind(null, callback));
 
             var start = Date.now();
             api.ping("serverTime", function(err, response) {

plugins/c9.vfs.client/vfs_client.js

@@ -329,6 +329,11 @@ define(function(require, exports, module) {
                 bufferedVfsCalls.push([method, path, options, callback]);
         }
         
+        function isIdle() {
+            return !Object.keys(connection.unacked).length &&
+                consumer && !Object.keys(consumer.callbacks || {}).length;
+        }
+        
         /***** Lifecycle *****/
         
         plugin.on("load", function(){
@@ -429,7 +434,9 @@ define(function(require, exports, module) {
             // Extending the API
             use: vfsCall.bind(null, "use"),
             extend: vfsCall.bind(null, "extend"),
-            unextend: vfsCall.bind(null, "unextend")
+            unextend: vfsCall.bind(null, "unextend"),
+            
+            isIdle: isIdle,
         });
         
         register(null, {