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Unified Diff: lib/child/frameScript.js

Issue 29338242: Issue 3792 - Fix to support multiprocess firefox (Closed)
Patch Set: fix Created Sept. 29, 2016, 8:59 p.m.
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Index: lib/child/frameScript.js
diff --git a/lib/child/frameScript.js b/lib/child/frameScript.js
new file mode 100644
index 0000000000000000000000000000000000000000..883595f7fb30307849eb868f1ecbecbb18d31d1f
--- /dev/null
+++ b/lib/child/frameScript.js
@@ -0,0 +1,129 @@
+/*
+ * This Source Code is subject to the terms of the Mozilla Public License
+ * version 2.0 (the "License"). You can obtain a copy of the License at
+ * http://mozilla.org/MPL/2.0/.
+ */
+
+"use strict";
+
+const {classes: Cc, interfaces: Ci, utils: Cu, results: Cr} = Components;
+
+/**
+ * @param e exception
+ */
+function reportException(e)
+{
+ let stack = "";
+ if (e && typeof e == "object" && "stack" in e)
+ stack = e.stack + "\n";
+
+ Cu.reportError(e);
+ dump(e + "\n" + stack + "\n");
+}
+
+const {XPCOMUtils} = Cu.import("resource://gre/modules/XPCOMUtils.jsm", {});
+
+/**
+ * Progress listener capturing the data of the current page and calling
+ * onPageLoaded(data) when loading is finished, where data contains
+ * HTTP status and headers.
+ *
+ * @type nsIWebProgressListener
+ */
+let webProgressListener =
+{
+ onStateChange: function(webProgress, request, flags, status)
+ {
+ if (webProgress.DOMWindow == content &&
+ (flags & Ci.nsIWebProgressListener.STATE_STOP))
+ {
+ // First time we receive STATE_STOP for about:blank and the second time
+ // for our interested URL which is distinct from about:blank.
+ // However we should not process about:blank because it can happen that
+ // the message with information about about:blank is delivered when the
+ // code in crawler.js is already waiting for a message from this tab.
+ // Another not interesting for us case is about:newtab.
Wladimir Palant 2016/09/30 07:43:12 Nit: "Another case we are not interested in is abo
sergei 2016/09/30 13:27:23 Done.
+ if (content.location.protocol == "about:")
+ return;
+ let pageInfo = {channelStatus: status};
+ if (request instanceof Ci.nsIHttpChannel)
+ {
+ try
+ {
+ pageInfo.headers = [];
+ pageInfo.headers.push("HTTP/x.x " + request.responseStatus + " " + request.responseStatusText);
+ request.visitResponseHeaders((header, value) => pageInfo.headers.push(header + ": " + value));
+ }
+ catch (e)
+ {
+ reportException(e);
+ }
+ }
+ onPageLoaded(pageInfo);
+ }
+ },
+
+ onLocationChange: function() {},
+ onProgressChange: function() {},
+ onStatusChange: function() {},
+ onSecurityChange: function() {},
+
+ QueryInterface: XPCOMUtils.generateQI([Ci.nsIWebProgressListener, Ci.nsISupportsWeakReference])
+};
+
+function onPageLoaded(pageInfo)
+{
+ Object.assign(pageInfo, gatherPageInfo(content));
+ sendAsyncMessage("abpcrawler:pageInfoGathered", pageInfo);
+};
+
+let webProgress = docShell.QueryInterface(Ci.nsIInterfaceRequestor).getInterface(Ci.nsIWebProgress);
+webProgress.addProgressListener(webProgressListener, Ci.nsIWebProgress.NOTIFY_STATE_WINDOW);
+
+/**
+ * Gathers information about a DOM window.
+ * Currently
+ * - creates a screenshot of the page
+ * - serializes the page source code
+ * @param {nsIDOMWindow} wnd window to process
+ * @return {Object} the object containing "screenshot" and "source" properties.
+ */
+function gatherPageInfo(wnd)
+{
+ let document = wnd.document;
+ let result = {errors:[]};
+ if (!document.documentElement)
+ {
+ result.errors.push("No document.documentElement");
+ return result;
+ }
+
+ try
+ {
+ let canvas = document.createElementNS("http://www.w3.org/1999/xhtml", "canvas");
+ canvas.width = document.documentElement.scrollWidth;
+ canvas.height = document.documentElement.scrollHeight;
+ let context = canvas.getContext("2d");
+ context.drawWindow(wnd, 0, 0, canvas.width, canvas.height, "rgb(255, 255, 255)");
+ result.screenshot = canvas.toDataURL("image/jpeg", 0.8);
+ }
+ catch (e)
+ {
+ reportException(e);
+ result.errors.push("Cannot make page screenshot");
+ }
+
+ try
+ {
+ // TODO: Capture frames as well?
+ let serializer = new wnd.XMLSerializer();
+ result.source = serializer.serializeToString(document.documentElement);
+ }
+ catch(e)
+ {
+ reportException(e);
+ result.errors.push("Cannot obtain page source code");
+ }
+
+ return result;
+}
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