Adblock Plus Crawler rewrite

lib/main.js

Index: lib/main.js
===================================================================
new file mode 100644
--- /dev/null
+++ b/lib/main.js
@@ -0,0 +1,92 @@
+/*
+ * 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/.
+ */
+
+/**
+ * @module main

[saroyanm, 2015/05/04 18:13:43]

I think this should be file overview, maybe smth like:
/*
 * @fileOverview Starts up Crawler
/*

[Wladimir Palant, 2015/05/07 00:04:59]

As Sebastian noted elsewhere, @module is actually appropriate here.

+ */
+
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+Cu.import("resource://gre/modules/Services.jsm");
+Cu.import("resource://gre/modules/Promise.jsm");
+
+require("commandLine");
+let {run} = require("crawler");
+
+let baseURL = null;
+
+/**
+ * Waits for the application to initialize.
+ * @type {Promise}
+ */
+let applicationReady = (function()
+{
+  let deferred = Promise.defer();

[saroyanm, 2015/05/04 18:13:43]

As mentioned in crawler.js please also don't use Deffered object here, but
Promises as well. This comment actually goes to other Deffered object usage in
the script.

[Wladimir Palant, 2015/05/07 00:04:59]

Done.

+
+  let observer = {
+    observe: function(subject, topic, data)
+    {
+      Services.obs.removeObserver(this, "sessionstore-windows-restored");
+      deferred.resolve();
+    },
+    QueryInterface: XPCOMUtils.generateQI([Ci.nsIObserver, Ci.nsISupportsWeakReference])
+  };
+
+  Services.obs.addObserver(observer, "sessionstore-windows-restored", true);
+  onShutdown.add(() => Services.obs.removeObserver(observer, "sessionstore-windows-restored"));
+
+  return deferred.promise;
+})();
+
+/**
+ * Startup function, called from command line handler.
+ *
+ * @param {int} port  Port to communicate with
+ */
+function startup(port)
+{
+  baseURL = "http://localhost:" + port + "/";
+
+  let request = new XMLHttpRequest();
+  request.open("GET", baseURL + "parameters");
+  request.addEventListener("load", onParametersLoaded, false);
+  request.addEventListener("error", onParametersFailed, false);
+  request.responseType = "json";
+  request.send();
+}
+exports.startup = startup;
+
+/**
+ * Called if parameters loaded succesfully.
+ *
+ * @param {Event} event
+ */
+function onParametersLoaded(event)
+{
+  let {urls, timeout, maxtabs} = event.target.response;
+
+  applicationReady.then(function()
+  {
+    let window = Services.wm.getMostRecentWindow("navigator:browser");
+    run(window, urls, timeout, maxtabs, baseURL + "save", function()
+    {
+      Services.startup.quit(Services.startup.eAttemptQuit);
+    });
+  }, function(exception)
+  {
+    Cu.reportError(exception);
+    dump(exception + "\n")
+  });
+}
+
+/**
+ * Called if requesting parameters failed.
+ *
+ * @param {Event} event
+ */
+function onParametersFailed(event)
+{
+  Cu.reportError("Failed loading parameters");

[saroyanm, 2015/05/04 18:13:43]

Maybe also make sense to print the message in the console, 
not to repeat the code, I think it make sense to create separate
"reportException" method, similar we have in crawler.js.

[Wladimir Palant, 2015/05/07 00:04:59]

Done.

+}