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index.js
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index.js
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import { monitorEventLoopDelay } from 'node:perf_hooks'
import { styleText as style, inspect } from 'node:util'
import { Table, printTable } from 'console-table-printer'
import histograms from './src/histograms.js'
import timeline from './src/timeline.js'
import errors from './src/errors.js'
import utils from './src/utils.js'
import Task from './src/task.js'
class Bench {
#state
constructor() {
this.tasks = []
this.entries = []
this.loopHs = new monitorEventLoopDelay({ resolution: 10 })
this.#state = 'ready'
}
async run(taskItems = []) {
this.#validateTasks(taskItems)
this.#throwIfEnded()
this.#throwIfRunning()
this.tasks = taskItems.map(item => new Task(item))
this.#transitionState('running')
this.loopHs.enable()
for (const task of this.tasks)
this.entries = this.entries.concat(await task.run())
return this.#end()
}
toTimeline() {
this.#throwIfNotEnded()
const table = new Table({
title: 'timeline',
columns: [
{ name: 'type', alignment: 'right' },
{ name: 'name', alignment: 'right' },
{ name: 'value', alignment: 'left' },
{ name: 'detail', alignment: 'left' }
]
})
table.addRows(timeline.computeHeaderRows({
column: 'type',
columns: ['type', 'name', 'value', 'detail'],
value: style(['white', 'bold', 'underline'], 'Startup')
}))
this.entries.forEach(entry => {
const isTask = entry.detail && entry.detail.length &&
Object.hasOwn(entry.detail[0], 'taskname')
return isTask ?
timeline.addRowForCycle(table, entry) :
timeline.addRowForEntry(table, entry)
})
process.env.NODE_ENV === 'test' ?
null : table.printTable()
return table
}
toHistogram() {
this.#throwIfNotEnded()
const table = new Table({
title: 'histograms',
columns: histograms.computeHistogramColumns()
})
histograms.addRowsForHeader(table, { name: 'tasks' })
histograms.addRowsForTasks(table, this.tasks)
histograms.addRowsForHeader(table, { name: 'entry' })
histograms.addRowsForMarks(table, this.entries)
histograms.addRowsForHeader(table, { name: 'measures' })
histograms.addRowsForMeasures(table, this.entries)
histograms.addRowsForHeader(table, { name: 'entry types' })
histograms.addRowsForEntryType(table, this.entries, { entryType: 'gc' })
histograms.addRowsForEntryType(table, this.entries, { entryType: 'dns' })
histograms.addRowsForEntryType(table, this.entries, { entryType: 'net' })
histograms.addRowsForHeader(table, { name: 'vitals' })
histograms.addRowsForHistogram(table, this.loopHs, { name: 'loop latency' })
process.env.NODE_ENV === 'test' ?
null : table.printTable()
return table
}
toPlots() {
this.#throwIfNotEnded()
this.tasks.forEach(task => console.log(task.plot.get(), '\n'))
return this
}
toEntries() {
this.#throwIfNotEnded()
return this.tasks.map(task => {
return {
name: task.name,
entries: task.entries.flat()
}
})
}
async #end() {
this.loopHs.disable()
this.#transitionState('ended')
}
#transitionState(state) {
if (!['running', 'ended'].includes(state))
throw new errors.InvalidStateError(state)
this.#state = state
return this
}
#validateTasks(taskItems) {
if (!Array.isArray(taskItems) || !taskItems.length)
throw new Error(`Expected taskItems to be an Array with length`)
taskItems.forEach((item, i) => {
if (!item || typeof taskItems !== 'object')
throw new Error(`Expected task ${i} to be an object`)
if (!Object.hasOwn(item, 'name') || item.name.length < 1)
throw new Error(`Expected task ${i} to have a valid name property `)
if (!Object.hasOwn(item, 'fn') || typeof item.fn !== 'function')
throw new Error(`Expected task ${i} to have a valid fn property `)
if (!Object.hasOwn(item, 'cycles') || item.cycles < 1)
throw new Error(`Expected task.${i}.cycles to be a positive integer`)
})
return taskItems
}
#throwIfNotEnded() {
if (this.#state !== 'ended')
throw new errors.RunNotEndedError()
}
#throwIfEnded() {
if (this.#state === 'ended')
throw new errors.AlreadyEndedError()
}
#throwIfRunning() {
if (this.#state === 'running')
throw new errors.StillRunningError()
}
}
export default Bench