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/* 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 */
var EXPORTED_SYMBOLS = ["TelemetryTimestamps"];
* This module's purpose is to collect timestamps for important
* application-specific events.
* The TelemetryController component attaches the timestamps stored by this module to
* the telemetry submission, substracting the process lifetime so that the times
* are relative to process startup. The overall goal is to produce a basic
* timeline of the startup process.
var timeStamps = {};
var TelemetryTimestamps = {
* Adds a timestamp to the list. The addition of TimeStamps that already have
* a value stored is ignored.
* @param name must be a unique, generally "camelCase" descriptor of what the
* timestamp represents. e.g.: "delayedStartupStarted"
* @param value is a timeStamp in milliseconds since the epoch. If omitted,
* defaults to
add: function TT_add(name, value) {
// Default to "now" if not specified
if (value == null) {
value =;
if (isNaN(value)) {
throw new Error("Value must be a timestamp");
// If there's an existing value, just ignore the new value.
if (timeStamps.hasOwnProperty(name)) {
timeStamps[name] = value;
* Returns a JS object containing all of the timeStamps as properties (can be
* easily serialized to JSON). Used by TelemetryController to retrieve the data
* to attach to the telemetry submission.
get: function TT_get() {
// Return a copy of the object.
return Cu.cloneInto(timeStamps, {});