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background.js
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background.js
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const STORAGE_KEY = 'data';
const STORAGE_KEY_DATE_PREFIX = 'date::';
const STORAGE_DEBOUNCE_MS = 60000; // persist storage once per minute, max
// make this user-configurable
const DISPLAY_KEY = 'tabsLastCount';
let dateDataCache = null;
let tabIds = [];
const prefixes = {
tabsLastCount: '#',
tabsOpened: '+',
tabsClosed: '-',
tabsSwitched: '~'
};
// Listen for the reasons for activation, and pass
// to initialization function.
browser.runtime.onStartup.addListener(() => {
init('startup');
});
browser.runtime.onInstalled.addListener(() => {
init('install');
});
async function init(reason) {
//console.log('init', reason, getDateKey());
// TODO: This is so wrong. Figure out how to deterministically detect
// end of session restore.
if (reason == 'startup') {
//console.log('init: post-startup, so not listening to any tab events for 15s');
setTimeout(initEventListeners, 15000);
}
else {
initEventListeners();
}
// Populate UI
updateBadge();
}
// Save changes to persistent storage.
// But only every STORAGE_DEBOUNCE_MS.
let updateStorage = debounce(async function updateStorage() {
let dateKey = getDateKey();
let storageKey = STORAGE_KEY_DATE_PREFIX + dateKey;
let setParam = {};
setParam[storageKey] = dateDataCache;
await browser.storage.local.set(setParam);
}, STORAGE_DEBOUNCE_MS);
async function updateBadge() {
// get data for current date
const dateKey = getDateKey();
const dateData = await getDateData(dateKey);
// update badge data with default display value
const count = dateData[DISPLAY_KEY]
// 3 char display length limit on badge
const str = count > 999 ? '999' : count.toString();
browser.browserAction.setBadgeText({text: str});
// set icon tooltip to summary of all counters
let formattedCounts = Object.keys(prefixes).map(prefix => {
return prefixes[prefix] + dateData[prefix].toString();
});
browser.browserAction.setTitle({title: formattedCounts.join(' / ')});
}
async function updateData(eventType) {
const dateKey = getDateKey();
let dateData = await getDateData(dateKey);
if (eventType == 'onActivated') {
dateData.tabsSwitched++;
}
else {
if (eventType == 'onCreated') {
dateData.tabsOpened++;
dateData.tabsSwitched++;
}
else if (eventType == 'onRemoved') {
dateData.tabsClosed++;
}
let numTabs = await getTabCount();
if (eventType == 'onRemoved') {
numTabs--;
}
dateData.tabsLastCount = numTabs;
dateData.tabCounts[ (new Date()).getUTCHours() ] = numTabs;
if (numTabs > dateData.tabsMaxCount) {
dateData.tabsMaxCount = numTabs;
}
if (dateData.tabsMinCount === 0 || numTabs < dateData.tabsMinCount) {
dateData.tabsMinCount = numTabs;
}
}
// update UI
updateBadge();
await setDateData(dateKey, dateData);
}
function getDateKey() {
const d = new Date();
return [d.getUTCDate(), d.getUTCMonth(), d.getUTCFullYear()].join('-');
}
// Initializes persistent storage and cache if doesn't exist.
async function getDateData(dateKey) {
// If no cache (eg, we just started up)...
let dateData = getDateDataCache();
// Or date changed while we've been running...
if (!dateData || dateData.dateKey != dateKey) {
// Get data from storage.
const storageKey = STORAGE_KEY_DATE_PREFIX + dateKey;
let items = await browser.storage.local.get(storageKey);
// If no storage record for this date...
if (!items[storageKey]) {
// initialize date storage for the date.
dateData = {
dateKey: dateKey,
lastUpdated: (new Date()),
tabCounts: Array(24).fill(0),
tabsLastCount: 0,
tabsMaxCount: 0,
tabsMinCount: 0,
tabsOpened: 0,
tabsClosed: 0,
tabsSwitched: 0
};
// Store it.
await setDateData(dateKey, dateData);
}
else {
dateData = items[storageKey];
}
// Update cache
setDateDataCache(dateData);
}
return dateData;
}
// These are the only two bits touching that one global.
function getDateDataCache() {
return dateDataCache;
}
function setDateDataCache(dateData) {
dateDataCache = dateData;
}
async function setDateData(dateKey, dateData) {
setDateDataCache(dateData);
await updateStorage();
}
function initEventListeners() {
getTabCount();
browser.tabs.onCreated.addListener(tab => {
//console.log('onCreated');
updateData('onCreated');
});
browser.tabs.onRemoved.addListener(tab => {
//console.log('onRemoved');
updateData('onRemoved');
evictTabIdFromCache(tab.id);
});
browser.tabs.onActivated.addListener(info => {
//console.log('onActivated');
if (!isNewTabId(info.tabId)) {
updateData('onActivated');
}
});
}
/*
Tab Cache: Manually create and manage a cache of ids of current tabs
because the core APIs can't do things like let you know if a user
switched between two different tabs.
*/
async function getTabCount() {
const tabs = await browser.tabs.query({});
// exta work to make sure our tab cache is freshhhhhh
tabs.forEach(tab => { isNewTabId(tab.id) });
return tabs.length;
}
function isNewTabId(id) {
if (tabIds.indexOf(id) == -1) {
tabIds.push(id);
return true;
}
else {
return false;
}
}
function evictTabIdFromCache(id) {
const index = tabIds.indexOf(id);
if (index != -1) {
tabIds.splice(index, 1);
}
}
// https://davidwalsh.name/javascript-debounce-function
function debounce(func, wait, immediate) {
var timeout;
return function() {
var context = this, args = arguments;
var later = function() {
timeout = null;
if (!immediate) func.apply(context, args);
};
var callNow = immediate && !timeout;
clearTimeout(timeout);
timeout = setTimeout(later, wait);
if (callNow) func.apply(context, args);
};
}