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84 lines
2.5 KiB
84 lines
2.5 KiB
class ProgressStats {
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constructor (trackerName, totalTasks) {
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this.trackerName = trackerName
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this.totalTasks = totalTasks
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this.taskCounter = 0
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}
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logNext () {
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this.taskCounter++
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if (!this.beginTime) {
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this.beginTime = new Date()
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}
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}
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/**
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* Begin a new task. Print the current progress and then increment the number of tasks.
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* @param {string} A short message about the current task progress
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* @param {[boolean]} logTimeLeft whether or not to log the time left.
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*/
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beginTask (message, logTimeLeft) {
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this.printStats(message, logTimeLeft)
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this.logNext()
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}
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/**
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* Print the current progress.
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* @param {string} A short message about the current task progress
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* @param {[boolean]} logTimeLeft whether or not to log the time left.
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*/
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printStats (message, logTimeLeft) {
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message = `${message}; ${this.trackerName} progress: ${this.getPercentage()}% done`
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if (logTimeLeft) {
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message = `${message} - ${this.getTimeLeft()} left`
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}
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console.log(message)
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}
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/**
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* calculates the percentage of finished downloads
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* @returns {string}
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*/
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getPercentage () {
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var current = (this.taskCounter / this.totalTasks)
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return Math.round(current * 1000.0) / 10.0
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}
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/**
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* calculates the time left and outputs it in human readable format
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* calculation is based on the average time per task so far
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*
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* @returns {string}
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*/
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getTimeLeft () {
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if (this.taskCounter === 0) return '?'
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const averageTimePerTask = (Date.now() - this.beginTime.getTime()) / this.taskCounter
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var tasksLeft = this.totalTasks - this.taskCounter
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var millisecondsLeft = averageTimePerTask * tasksLeft
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return this.formatMilliseconds(millisecondsLeft)
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}
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/**
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* inspired from https://stackoverflow.com/questions/19700283/how-to-convert-time-milliseconds-to-hours-min-sec-format-in-javascript
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* @param millisec
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* @returns {string}
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*/
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formatMilliseconds (millisec) {
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var seconds = (millisec / 1000).toFixed(1)
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var minutes = (millisec / (1000 * 60)).toFixed(1)
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var hours = (millisec / (1000 * 60 * 60)).toFixed(1)
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var days = (millisec / (1000 * 60 * 60 * 24)).toFixed(1)
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if (seconds < 60) {
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return seconds + ' seconds'
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} else if (minutes < 60) {
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return minutes + ' minutes'
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} else if (hours < 24) {
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return hours + ' hours'
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} else {
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return days + ' days'
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}
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}
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}
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module.exports = ProgressStats
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