Issue 3375 - Issue reporter: move screenshot creation into the content process

lib/dataCollector.js

Index: lib/dataCollector.js
===================================================================
new file mode 100644
--- /dev/null
+++ b/lib/dataCollector.js
@@ -0,0 +1,61 @@
+/*
+ * This file is part of Adblock Plus <https://adblockplus.org/>,
+ * Copyright (C) 2006-2015 Eyeo GmbH
+ *
+ * Adblock Plus is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 3 as
+ * published by the Free Software Foundation.
+ *
+ * Adblock Plus is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/**
+ * @fileOverview Collects some data for a content window, to be attached to
+ * issue reports.
+ */
+
+"use strict";
+
+let {Utils} = require("utils");
+
+let maxResponseID = 0;
+let callbacks = new Map();
+
+let messageManager = Cc["@mozilla.org/parentprocessmessagemanager;1"]
+                       .getService(Ci.nsIMessageListenerManager)
+                       .QueryInterface(Ci.nsIMessageBroadcaster);
+
+Utils.addChildMessageListener("AdblockPlus:CollectDataResponse", onResponse);
+
+function onResponse({responseID, data})
+{
+  let callback = callbacks.get(responseID);
+  callbacks.delete(responseID);
+  if (typeof callback == "function")
+    callback(data);
+}
+
+/**
+ * Collects data for the given window.
+ * @param {number} outerWindowID  the ID of the window
+ * @param {number} screenshotWidth  width of the screenshot to be created
+ * @param {Function} callback  function to be called with the data
+ */
+function collectData(outerWindowID, screenshotWidth, callback)
+{
+  let id = ++maxResponseID;
+  callbacks.set(id, callback);
+
+  messageManager.broadcastAsyncMessage("AdblockPlus:CollectData", {
+    outerWindowID,
+    screenshotWidth,
+    responseID: id
+  });
+}
+exports.collectData = collectData;