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pool.ts
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pool.ts
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import { MessageChannel } from 'worker_threads'
import { pathToFileURL } from 'url'
import { cpus } from 'os'
import { resolve } from 'pathe'
import type { Options as TinypoolOptions } from 'tinypool'
import { Tinypool } from 'tinypool'
import { createBirpc } from 'birpc'
import type { RawSourceMap } from 'vite-node'
import type { WorkerContext, WorkerRPC } from '../types'
import { distDir } from '../constants'
import type { Vitest } from './core'
export type RunWithFiles = (files: string[], invalidates?: string[]) => Promise<void>
export interface WorkerPool {
runTests: RunWithFiles
collectTests: RunWithFiles
close: () => Promise<void>
}
export function createPool(ctx: Vitest): WorkerPool {
if (ctx.config.threads)
return createWorkerPool(ctx)
else
return createFakePool(ctx)
}
const workerPath = pathToFileURL(resolve(distDir, './worker.js')).href
export function createFakePool(ctx: Vitest): WorkerPool {
const runWithFiles = (name: 'run' | 'collect'): RunWithFiles => {
return async(files, invalidates) => {
const worker = await import(workerPath)
const { workerPort, port } = createChannel(ctx)
const data: WorkerContext = {
port: workerPort,
config: ctx.getConfig(),
files,
invalidates,
id: 1,
}
await worker[name](data, { transferList: [workerPort] })
port.close()
workerPort.close()
}
}
return {
runTests: runWithFiles('run'),
collectTests: runWithFiles('collect'),
close: async() => {},
}
}
export function createWorkerPool(ctx: Vitest): WorkerPool {
const threadsCount = ctx.config.watch
? Math.max(cpus().length / 2, 1)
: Math.max(cpus().length - 1, 1)
const options: TinypoolOptions = {
filename: workerPath,
// Disable this for now for WebContainers
// https://github.com/vitest-dev/vitest/issues/93
useAtomics: typeof process.versions.webcontainer !== 'string',
maxThreads: ctx.config.maxThreads ?? threadsCount,
minThreads: ctx.config.minThreads ?? threadsCount,
}
if (ctx.config.isolate) {
options.isolateWorkers = true
options.concurrentTasksPerWorker = 1
}
const pool = new Tinypool(options)
const runWithFiles = (name: string): RunWithFiles => {
return async(files, invalidates) => {
let id = 0
await Promise.all(files.map(async(file) => {
const { workerPort, port } = createChannel(ctx)
const data: WorkerContext = {
port: workerPort,
config: ctx.getConfig(),
files: [file],
invalidates,
id: ++id,
}
await pool.run(data, { transferList: [workerPort], name })
port.close()
workerPort.close()
}))
}
}
return {
runTests: runWithFiles('run'),
collectTests: runWithFiles('collect'),
close: async() => {}, // TODO: not sure why this will cause Node crash: pool.destroy(),
}
}
function createChannel(ctx: Vitest) {
const channel = new MessageChannel()
const port = channel.port2
const workerPort = channel.port1
createBirpc<{}, WorkerRPC>(
{
onWorkerExit(code) {
process.exit(code || 1)
},
snapshotSaved(snapshot) {
ctx.snapshot.add(snapshot)
},
async getSourceMap(id, force) {
if (force) {
const mod = ctx.server.moduleGraph.getModuleById(id)
if (mod)
ctx.server.moduleGraph.invalidateModule(mod)
}
const r = await ctx.vitenode.transformRequest(id)
return r?.map as RawSourceMap | undefined
},
fetch(id) {
return ctx.vitenode.fetchModule(id)
},
resolveId(id, importer) {
return ctx.vitenode.resolveId(id, importer)
},
onCollected(files) {
ctx.state.collectFiles(files)
ctx.report('onCollected', files)
},
onTaskUpdate(packs) {
ctx.state.updateTasks(packs)
ctx.report('onTaskUpdate', packs)
},
onUserConsoleLog(log) {
ctx.state.updateUserLog(log)
ctx.report('onUserConsoleLog', log)
},
onFinished(files) {
ctx.report('onFinished', files)
},
},
{
post(v) {
port.postMessage(v)
},
on(fn) {
port.on('message', fn)
},
},
)
return { workerPort, port }
}