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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
const PREF_APP_UPDATE_LASTUPDATETIME_FMT = "app.update.lastUpdateTime.%ID%";
const PREF_APP_UPDATE_TIMERMINIMUMDELAY = "app.update.timerMinimumDelay";
const PREF_APP_UPDATE_TIMERFIRSTINTERVAL = "app.update.timerFirstInterval";
const PREF_APP_UPDATE_LOG = "app.update.log";
const CATEGORY_UPDATE_TIMER = "update-timer";
const lazy = {};
XPCOMUtils.defineLazyPreferenceGetter(
lazy,
"gLogEnabled",
PREF_APP_UPDATE_LOG,
false
);
/**
* Logs a string to the error console.
* @param string
* The string to write to the error console.
* @param bool
* Whether to log even if logging is disabled.
*/
function LOG(string, alwaysLog = false) {
if (alwaysLog || lazy.gLogEnabled) {
dump("*** UTM:SVC " + string + "\n");
Services.console.logStringMessage("UTM:SVC " + string);
}
}
/**
* A manager for timers. Manages timers that fire over long periods of time
* (e.g. days, weeks, months).
* @constructor
*/
export function TimerManager() {
Services.obs.addObserver(this, "profile-before-change");
}
TimerManager.prototype = {
/**
* nsINamed
*/
name: "UpdateTimerManager",
/**
* The Checker Timer
*/
_timer: null,
/**
* The Checker Timer minimum delay interval as specified by the
* app.update.timerMinimumDelay pref. If the app.update.timerMinimumDelay
* pref doesn't exist this will default to 120000.
*/
_timerMinimumDelay: null,
/**
* The set of registered timers.
*/
_timers: {},
/**
* See nsIObserver.idl
*/
observe: function TM_observe(aSubject, aTopic) {
// Prevent setting the timer interval to a value of less than 30 seconds.
var minInterval = 30000;
// Prevent setting the first timer interval to a value of less than 10
// seconds.
var minFirstInterval = 10000;
switch (aTopic) {
case "utm-test-init":
// Enforce a minimum timer interval of 500 ms for tests and fall through
// to profile-after-change to initialize the timer.
minInterval = 500;
minFirstInterval = 500;
// fall through
case "profile-after-change":
this._timerMinimumDelay = Math.max(
1000 *
Services.prefs.getIntPref(PREF_APP_UPDATE_TIMERMINIMUMDELAY, 120),
minInterval
);
// Prevent the timer delay between notifications to other consumers from
// being greater than 5 minutes which is 300000 milliseconds.
this._timerMinimumDelay = Math.min(this._timerMinimumDelay, 300000);
// Prevent the first interval from being less than the value of minFirstInterval
let firstInterval = Math.max(
Services.prefs.getIntPref(PREF_APP_UPDATE_TIMERFIRSTINTERVAL, 30000),
minFirstInterval
);
// Prevent the first interval from being greater than 2 minutes which is
// 120000 milliseconds.
firstInterval = Math.min(firstInterval, 120000);
// Cancel the timer if it has already been initialized. This is primarily
// for tests.
this._canEnsureTimer = true;
this._ensureTimer(firstInterval);
break;
case "profile-before-change":
Services.obs.removeObserver(this, "profile-before-change");
// Release everything we hold onto.
this._cancelTimer();
for (var timerID in this._timers) {
delete this._timers[timerID];
}
this._timers = null;
break;
}
},
/**
* Called when the checking timer fires.
*
* We only fire one notification each time, so that the operations are
* staggered. We don't want too many to happen at once, which could
* negatively impact responsiveness.
*
* @param timer
* The checking timer that fired.
*/
notify: function TM_notify(timer) {
var nextDelay = null;
function updateNextDelay(delay) {
if (nextDelay === null || delay < nextDelay) {
nextDelay = delay;
}
}
// Each timer calls tryFire(), which figures out which is the one that
// wanted to be called earliest. That one will be fired; the others are
// skipped and will be done later.
var now = Math.round(Date.now() / 1000);
var callbacksToFire = [];
function tryFire(timerID, callback, intendedTime) {
if (intendedTime <= now) {
callbacksToFire.push({ timerID, callback, intendedTime });
} else {
updateNextDelay(intendedTime - now);
}
}
for (let { value } of Services.catMan.enumerateCategory(
CATEGORY_UPDATE_TIMER
)) {
let [cid, method, timerID, prefInterval, defaultInterval, maxInterval] =
value.split(",");
defaultInterval = parseInt(defaultInterval);
// cid and method are validated below when calling notify.
if (!timerID || !defaultInterval || isNaN(defaultInterval)) {
LOG(
"TimerManager:notify - update-timer category registered" +
(cid ? " for " + cid : "") +
" without required parameters - " +
"skipping"
);
continue;
}
let interval = Services.prefs.getIntPref(prefInterval, defaultInterval);
// Allow the update-timer category to specify a maximum value to prevent
// values larger than desired.
maxInterval = parseInt(maxInterval);
if (maxInterval && !isNaN(maxInterval)) {
interval = Math.min(interval, maxInterval);
}
let prefLastUpdate = PREF_APP_UPDATE_LASTUPDATETIME_FMT.replace(
/%ID%/,
timerID
);
// Initialize the last update time to 0 when the preference isn't set so
// the timer will be notified soon after a new profile's first use.
let lastUpdateTime = Services.prefs.getIntPref(prefLastUpdate, 0);
// If the last update time is greater than the current time then reset
// it to 0 and the timer manager will correct the value when it fires
// next for this consumer.
if (lastUpdateTime > now) {
lastUpdateTime = 0;
Services.prefs.setIntPref(prefLastUpdate, lastUpdateTime);
}
tryFire(
timerID,
function () {
ChromeUtils.idleDispatch(() => {
try {
let startTime = Cu.now();
Cc[cid][method](Ci.nsITimerCallback).notify(timer);
ChromeUtils.addProfilerMarker(
"UpdateTimer",
{ category: "Timer", startTime },
timerID
);
LOG("TimerManager:notify - notified " + cid);
} catch (e) {
LOG(
"TimerManager:notify - error notifying component id: " +
cid +
" ,error: " +
e
);
}
});
Services.prefs.setIntPref(prefLastUpdate, now);
updateNextDelay(interval);
},
lastUpdateTime + interval
);
}
for (let _timerID in this._timers) {
let timerID = _timerID; // necessary for the closure to work properly
let timerData = this._timers[timerID];
// If the last update time is greater than the current time then reset
// it to 0 and the timer manager will correct the value when it fires
// next for this consumer.
if (timerData.lastUpdateTime > now) {
let prefLastUpdate = PREF_APP_UPDATE_LASTUPDATETIME_FMT.replace(
/%ID%/,
timerID
);
timerData.lastUpdateTime = 0;
Services.prefs.setIntPref(prefLastUpdate, timerData.lastUpdateTime);
}
tryFire(
timerID,
function () {
if (timerData.callback && timerData.callback.notify) {
ChromeUtils.idleDispatch(() => {
try {
let startTime = Cu.now();
timerData.callback.notify(timer);
ChromeUtils.addProfilerMarker(
"UpdateTimer",
{ category: "Timer", startTime },
timerID
);
LOG(`TimerManager:notify - notified timerID: ${timerID}`);
} catch (e) {
LOG(
`TimerManager:notify - error notifying timerID: ${timerID}, error: ${e}`
);
}
});
} else {
LOG(
`TimerManager:notify - timerID: ${timerID} doesn't implement nsITimerCallback - skipping`
);
}
timerData.lastUpdateTime = now;
let prefLastUpdate = PREF_APP_UPDATE_LASTUPDATETIME_FMT.replace(
/%ID%/,
timerID
);
Services.prefs.setIntPref(prefLastUpdate, now);
updateNextDelay(timerData.interval);
},
timerData.lastUpdateTime + timerData.interval
);
}
if (callbacksToFire.length) {
callbacksToFire.sort((a, b) => a.intendedTime - b.intendedTime);
for (let { intendedTime, timerID, callback } of callbacksToFire) {
LOG(
`TimerManager:notify - fire timerID: ${timerID} ` +
`intended time: ${intendedTime} (${new Date(
intendedTime * 1000
).toISOString()})`
);
callback();
}
}
if (nextDelay !== null) {
timer.delay = Math.max(nextDelay * 1000, this._timerMinimumDelay);
this.lastTimerReset = Date.now();
} else {
this._cancelTimer();
}
},
/**
* Starts the timer, if necessary, and ensures that it will fire soon enough
* to happen after time |interval| (in milliseconds).
*/
_ensureTimer(interval) {
if (!this._canEnsureTimer) {
return;
}
if (!this._timer) {
this._timer = Cc["@mozilla.org/timer;1"].createInstance(Ci.nsITimer);
this._timer.initWithCallback(
this,
interval,
Ci.nsITimer.TYPE_REPEATING_SLACK
);
this.lastTimerReset = Date.now();
} else if (
Date.now() + interval <
this.lastTimerReset + this._timer.delay
) {
this._timer.delay = Math.max(
this.lastTimerReset + interval - Date.now(),
0
);
}
},
/**
* Stops the timer, if it is running.
*/
_cancelTimer() {
if (this._timer) {
this._timer.cancel();
this._timer = null;
}
},
/**
* See nsIUpdateTimerManager.idl
*/
registerTimer: function TM_registerTimer(id, callback, interval, skipFirst) {
let markerText = `timerID: ${id} interval: ${interval}s`;
if (skipFirst) {
markerText += " skipFirst";
}
ChromeUtils.addProfilerMarker(
"RegisterUpdateTimer",
{ category: "Timer" },
markerText
);
LOG(
`TimerManager:registerTimer - timerID: ${id} interval: ${interval} skipFirst: ${skipFirst}`
);
if (this._timers === null) {
// Use normal logging since reportError is not available while shutting
// down.
LOG(
"TimerManager:registerTimer called after profile-before-change " +
"notification. Ignoring timer registration for id: " +
id,
true
);
return;
}
if (id in this._timers && callback != this._timers[id].callback) {
LOG(
"TimerManager:registerTimer - Ignoring second registration for " + id
);
return;
}
let prefLastUpdate = PREF_APP_UPDATE_LASTUPDATETIME_FMT.replace(/%ID%/, id);
// Initialize the last update time to 0 when the preference isn't set so
// the timer will be notified soon after a new profile's first use.
let lastUpdateTime = Services.prefs.getIntPref(prefLastUpdate, 0);
let now = Math.round(Date.now() / 1000);
if (lastUpdateTime > now) {
lastUpdateTime = 0;
}
if (lastUpdateTime == 0) {
if (skipFirst) {
lastUpdateTime = now;
}
Services.prefs.setIntPref(prefLastUpdate, lastUpdateTime);
}
this._timers[id] = { callback, interval, lastUpdateTime };
this._ensureTimer(interval * 1000);
},
unregisterTimer: function TM_unregisterTimer(id) {
ChromeUtils.addProfilerMarker(
"UnregisterUpdateTimer",
{ category: "Timer" },
id
);
LOG("TimerManager:unregisterTimer - id: " + id);
if (id in this._timers) {
delete this._timers[id];
} else {
LOG(
"TimerManager:unregisterTimer - Ignoring unregistration request for " +
"unknown id: " +
id
);
}
},
classID: Components.ID("{B322A5C0-A419-484E-96BA-D7182163899F}"),
QueryInterface: ChromeUtils.generateQI([
"nsINamed",
"nsIObserver",
"nsITimerCallback",
"nsIUpdateTimerManager",
]),
};