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106 lines
3.4 KiB
JavaScript
106 lines
3.4 KiB
JavaScript
/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
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/* vim: set ts=2 et sw=2 tw=80 filetype=javascript: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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"use strict";
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/**
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* Read the data saved by nsTerminator during shutdown and feed it to the
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* relevant telemetry histograms.
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*/
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const Cc = Components.classes;
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const Ci = Components.interfaces;
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const Cu = Components.utils;
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const Cr = Components.results;
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Cu.import("resource://gre/modules/XPCOMUtils.jsm");
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XPCOMUtils.defineLazyModuleGetter(this, "OS",
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"resource://gre/modules/osfile.jsm");
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XPCOMUtils.defineLazyModuleGetter(this, "Promise",
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"resource://gre/modules/Promise.jsm");
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XPCOMUtils.defineLazyModuleGetter(this, "Task",
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"resource://gre/modules/Task.jsm");
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XPCOMUtils.defineLazyModuleGetter(this, "setTimeout",
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"resource://gre/modules/Timer.jsm");
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XPCOMUtils.defineLazyModuleGetter(this, "Services",
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"resource://gre/modules/Services.jsm");
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function nsTerminatorTelemetry() {}
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var HISTOGRAMS = {
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"quit-application": "SHUTDOWN_PHASE_DURATION_TICKS_QUIT_APPLICATION",
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"profile-change-teardown": "SHUTDOWN_PHASE_DURATION_TICKS_PROFILE_CHANGE_TEARDOWN",
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"profile-before-change": "SHUTDOWN_PHASE_DURATION_TICKS_PROFILE_BEFORE_CHANGE",
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"xpcom-will-shutdown": "SHUTDOWN_PHASE_DURATION_TICKS_XPCOM_WILL_SHUTDOWN",
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};
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nsTerminatorTelemetry.prototype = {
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classID: Components.ID("{3f78ada1-cba2-442a-82dd-d5fb300ddea7}"),
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_xpcom_factory: XPCOMUtils.generateSingletonFactory(nsTerminatorTelemetry),
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//////////////////////////////////////////////////////////////////////////////
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//// nsISupports
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QueryInterface: XPCOMUtils.generateQI([Ci.nsIObserver]),
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//////////////////////////////////////////////////////////////////////////////
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//// nsIObserver
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observe: function DS_observe(aSubject, aTopic, aData)
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{
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Task.spawn(function*() {
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//
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// This data is hardly critical, reading it can wait for a few seconds.
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//
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yield new Promise(resolve => setTimeout(resolve, 3000));
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let PATH = OS.Path.join(OS.Constants.Path.localProfileDir,
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"ShutdownDuration.json");
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let raw;
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try {
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raw = yield OS.File.read(PATH, { encoding: "utf-8" });
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} catch (ex if ex.becauseNoSuchFile) {
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return;
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}
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// Let other errors be reported by Promise's error-reporting.
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// Clean up
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OS.File.remove(PATH);
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OS.File.remove(PATH + ".tmp");
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let data = JSON.parse(raw);
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for (let k of Object.keys(data)) {
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let id = HISTOGRAMS[k];
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try {
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let histogram = Services.telemetry.getHistogramById(id);
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if (!histogram) {
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throw new Error("Unknown histogram " + id);
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}
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histogram.add(Number.parseInt(data[k]));
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} catch (ex) {
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// Make sure that the error is reported and causes test failures,
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// but otherwise, ignore it.
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Promise.reject(ex);
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continue;
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}
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}
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// Inform observers that we are done.
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Services.obs.notifyObservers(null,
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"shutdown-terminator-telemetry-updated",
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"");
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});
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},
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};
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////////////////////////////////////////////////////////////////////////////////
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//// Module
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this.NSGetFactory = XPCOMUtils.generateNSGetFactory([nsTerminatorTelemetry]);
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