25ee61d3cb
We use timers to decide when to query and delete expired messages or when to perform signed key rotations. Internally, timers are counters that get updated when the CPU ticks, so if the CPU sleeps, the timer will stop counting, and start again after it wakes up, ignoring the intervening passage of wall clock time. To fix this, without having to query the database or other potentially high overhead operations too often, use an interval to frequently check the wall clock time. If time jumps forward, trigger a global event so other listeners can update their possibly-inaccurate timers. https://stackoverflow.com/questions/6346849/what-happens-to-settimeout-when-the-computer-goes-to-sleep https://stackoverflow.com/questions/4079115/can-any-desktop-browsers-detect-when-the-computer-resumes-from-sleep // FREEBIE
103 lines
3 KiB
JavaScript
103 lines
3 KiB
JavaScript
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/*
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* vim: ts=4:sw=4:expandtab
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*/
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;(function() {
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'use strict';
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window.Whisper = window.Whisper || {};
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function destroyExpiredMessages() {
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// Load messages that have expired and destroy them
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var expired = new Whisper.MessageCollection();
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expired.on('add', function(message) {
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console.log('message', message.get('sent_at'), 'expired');
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message.destroy();
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message.getConversation().trigger('expired', message);
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});
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expired.on('reset', checkExpiringMessages);
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expired.fetchExpired();
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}
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var timeout;
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function checkExpiringMessages() {
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// Look up the next expiring message and set a timer to destroy it
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var expiring = new Whisper.MessageCollection();
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expiring.once('add', function(next) {
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var expires_at = next.get('expires_at');
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console.log('next message expires', new Date(expires_at));
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var wait = expires_at - Date.now();
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if (wait < 0) { wait = 0; }
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clearTimeout(timeout);
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timeout = setTimeout(destroyExpiredMessages, wait);
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});
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expiring.fetchNextExpiring();
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}
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window.ExpiringMessagesListener = {
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init: function() {
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checkExpiringMessages();
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window.events.on('timetravel', checkExpiringMessages);
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},
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update: checkExpiringMessages
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};
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var TimerOption = Backbone.Model.extend({
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getName: function() {
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return i18n([
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'timerOption', this.get('time'), this.get('unit'),
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].join('_')) || moment.duration(this.get('time'), this.get('unit')).humanize();
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},
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getAbbreviated: function() {
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return i18n([
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'timerOption', this.get('time'), this.get('unit'), 'abbreviated'
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].join('_'));
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}
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});
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Whisper.ExpirationTimerOptions = new (Backbone.Collection.extend({
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model: TimerOption,
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getName: function(seconds) {
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if (!seconds) {
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seconds = 0;
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}
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var o = this.findWhere({seconds: seconds});
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if (o) { return o.getName(); }
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else {
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return [seconds, 'seconds'].join(' ');
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}
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},
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getAbbreviated: function(seconds) {
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if (!seconds) {
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seconds = 0;
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}
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var o = this.findWhere({seconds: seconds});
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if (o) { return o.getAbbreviated(); }
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else {
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return [seconds, 's'].join('');
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}
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}
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}))([
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[ 0, 'seconds' ],
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[ 5, 'seconds' ],
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[ 10, 'seconds' ],
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[ 30, 'seconds' ],
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[ 1, 'minute' ],
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[ 5, 'minutes' ],
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[ 30, 'minutes' ],
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[ 1, 'hour' ],
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[ 6, 'hours' ],
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[ 12, 'hours' ],
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[ 1, 'day' ],
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[ 1, 'week' ],
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].map(function(o) {
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var duration = moment.duration(o[0], o[1]); // 5, 'seconds'
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return {
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time: o[0],
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unit: o[1],
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seconds: duration.asSeconds()
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};
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}));
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})();
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