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const TIMEOUT_ERROR = 'timeout'
/**
* Promise-based Timer. Execute fn every tick.
* When fn is resolved — timer will stop
* @param {Number} delay - delay between ticks
* @param {Number} timeout - after that time timer will stop
* @param {Function} fn - function that returns promise. will execute every tick
* @param {Boolean} leading - should be function invoked on start
* @return {promise} Promise-based Timer.
*/
class Timer {
constructor (delay, timeout, fn, leading) {
this._delay = delay
this._timeout = timeout
this._fn = fn
this._leading = leading
this._conditionExecutedCnt = 0
/**
* only wrap waitUntil condition if:
* - wdio-sync is installed
* - function name is not async
*/
Iif (hasWdioSyncSupport && !fn.name.includes('async')) {
this._fn = () => runFnInFiberContext(fn)()
}
const retPromise = new Promise((resolve, reject) => {
this._resolve = resolve
this._reject = reject
})
this.start()
return retPromise
}
start () {
this._start = Date.now()
this._ticks = 0
if (this._leading) {
this.tick()
} else {
this._timeoutId = setTimeout(this.tick.bind(this), this._delay)
}
this._mainTimeoutId = setTimeout(() => {
/**
* make sure that condition was executed at least once
*/
Iif (!this.wasConditionExecuted()) {
return
}
const reason = this.lastError || new Error(TIMEOUT_ERROR)
this._reject(reason)
this.stop()
}, this._timeout)
}
stop () {
if (this._timeoutId) {
clearTimeout(this._timeoutId)
}
this._timeoutId = null
}
stopMain () {
clearTimeout(this._mainTimeoutId)
}
tick () {
const result = this._fn()
if (typeof result.then !== 'function') {
if (!result) {
return this.checkCondition(new Error('return value was never truthy'))
}
return this.checkCondition(null, result)
}
result.then(
(res) => this.checkCondition(null, res),
(err) => this.checkCondition(err)
)
}
checkCondition (err, res) {
++this._conditionExecutedCnt
this.lastError = err
// resolve timer only on truthy values
if (res) {
this._resolve(res)
this.stop()
this.stopMain()
return
}
// autocorrect timer
let diff = (Date.now() - this._start) - (this._ticks++ * this._delay)
let delay = Math.max(0, this._delay - diff)
// clear old timeoutID
this.stop()
// check if we have time to one more tick
if (this.hasTime(delay)) {
this._timeoutId = setTimeout(this.tick.bind(this), delay)
} else {
this.stopMain()
const reason = this.lastError || new Error(TIMEOUT_ERROR)
this._reject(reason)
}
}
hasTime (delay) {
return (Date.now() - this._start + delay) <= this._timeout
}
wasConditionExecuted () {
return this._conditionExecutedCnt > 0
}
}
export default Timer
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