Fix gorhill#10

Postpone client messages until document is visible

Author: el1t

platform/safari/vapi-background.js

@@ -828,7 +828,7 @@
 
         CallbackWrapper.prototype.init = function(port, request, timeout) {
             this.port = port;
-            this.request = request;
+            this.request = request || port;
             this.timerId = timeout !== undefined ?
                 vAPI.setTimeout(this.callback, timeout) :
                 null;
@@ -841,7 +841,7 @@
                 delete toAuxPending[this.timerId];
                 this.timerId = null;
             }
-            this.port.dispatchMessage(this.request.name, {
+            this.port.target.page.dispatchMessage(this.request.name, {
                 auxProcessId: this.request.message.auxProcessId,
                 channelName: this.request.message.channelName,
                 msg: response !== undefined ? response : null
@@ -931,7 +931,7 @@
             // Auxiliary process to auxiliary process
             if ( message.toTabId !== undefined ) {
                 // TODO: this doesn't work.
-                toAux(message, request.target.page);
+                toAux(message, request);
                 return;
             }
 
@@ -944,7 +944,7 @@
             // Auxiliary process to main process: prepare response
             var callback = messaging.NOOPFUNC;
             if ( message.auxProcessId !== undefined ) {
-                callback = callbackWrapperFactory(request.target.page, request).callback;
+                callback = callbackWrapperFactory(request).callback;
             }
 
             var sender = {

platform/safari/vapi-client.js

@@ -319,8 +319,11 @@
     vAPI.messaging = {
 	    channels: Object.create(null),
 	    channelCount: 0,
+        // Waiting for response
 	    pending: Object.create(null),
 	    pendingCount: 0,
+        // Waiting to send
+        queued: [],
 	    auxProcessId: 1,
 	    shuttingDown: false,
 
@@ -414,6 +417,16 @@
                     Function(msg.details.code).call(self);
                 }
             });
+            // Handle queued messages when page becomes visible
+            document.addEventListener('visibilitychange', function() {
+                if (document.hidden === true) return;
+                var message;
+                for (var i = 0; i < this.queued.length; i++) {
+                    message = this.queued[i];
+                    this.postMessage(message.auxProcessId, message);
+                }
+                this.queued.length = 0;
+            }.bind(this));
 	    },
 
 	    send: function(channelName, message, callback) {
@@ -437,14 +450,19 @@
             if (!this.connector) {
                 this.connect();
             }
-            this.postMessage(auxProcessId, {
+            message = {
                 channelName: channelName,
                 auxProcessId: auxProcessId,
                 toTabId: toTabId,
                 toChannel: toChannel,
                 msg: message
-            });
-
+            };
+            if (document.hidden === true) {
+                // Wait for visibility change
+                this.queued.push(message);
+            } else {
+                this.postMessage(auxProcessId, message);
+            }
 	    },
 
         postMessage: function(auxProcessId, message) {