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