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timers.js
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timers.js
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const _ = require('lodash')
const create = () => {
let paused
let flushing
let timerQueue
let cancelledTimerIds
const reset = () => {
paused = false
flushing = false
timerQueue = []
cancelledTimerIds = {}
}
const isPaused = () => {
return paused
}
const invoke = (contentWindow, fnOrCode, params = []) => {
if (_.isFunction(fnOrCode)) {
return fnOrCode(...params)
}
return contentWindow.eval(fnOrCode)
}
const flushTimerQueue = () => {
flushing = true
_.each(timerQueue, (timer) => {
const { timerId, type, fnOrCode, params, contentWindow } = timer
// if we are a setInterval and we're been cancelled
// then just return. this can happen when a setInterval
// queues many callbacks, and from within that callback
// we would have cancelled the original setInterval
if (type === 'setInterval' && cancelledTimerIds[timerId]) {
return
}
invoke(contentWindow, fnOrCode, params)
})
reset()
}
const pauseTimers = (pause) => {
paused = Boolean(pause)
if (!paused) {
flushTimerQueue()
}
}
const wrap = (contentWindow) => {
const originals = {
setTimeout: contentWindow.setTimeout,
setInterval: contentWindow.setInterval,
requestAnimationFrame: contentWindow.requestAnimationFrame,
clearTimeout: contentWindow.clearTimeout,
clearInterval: contentWindow.clearInterval,
// cancelAnimationFrame: contentWindow.cancelAnimationFrame,
}
const callThrough = (fnName, args) => {
return originals[fnName].apply(contentWindow, args)
}
const wrapCancel = (fnName) => {
return (timerId) => {
if (flushing) {
cancelledTimerIds[timerId] = true
}
return callThrough(fnName, [timerId])
}
}
const wrapTimer = (fnName) => {
return (...args) => {
let timerId
let [fnOrCode, delay, ...params] = args
const timerOverride = (...params) => {
// if we're currently paused then we need
// to enqueue this timer callback and invoke
// it immediately once we're unpaused
if (paused) {
timerQueue.push({
timerId,
fnOrCode,
params,
contentWindow,
type: fnName,
})
return
}
// else go ahead and invoke the real function
// the same way the browser otherwise would
return invoke(contentWindow, fnOrCode, params)
}
timerId = callThrough(fnName, [timerOverride, delay, ...params])
return timerId
}
}
contentWindow.setTimeout = wrapTimer('setTimeout')
contentWindow.setInterval = wrapTimer('setInterval')
contentWindow.requestAnimationFrame = wrapTimer('requestAnimationFrame')
contentWindow.clearTimeout = wrapCancel('clearTimeout')
contentWindow.clearInterval = wrapCancel('clearInterval')
// contentWindow.cancelAnimationFrame = wrapFn('cancelAnimationFrame')
}
// always initially reset to set the state
reset()
return {
wrap,
reset,
isPaused,
pauseTimers,
}
}
module.exports = {
create,
}