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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 { ResolvedConfig, WorkerContext, WorkerRPC } from '../types'
import { distDir } from '../constants'
import { AggregateError } from '../utils'
import type { Vitest } from './core'
export type RunWithFiles = (files: string[], invalidates?: string[]) => Promise<void>
export interface WorkerPool {
runTests: RunWithFiles
close: () => Promise<void>
}
const workerPath = pathToFileURL(resolve(distDir, './worker.mjs')).href
export function createPool(ctx: Vitest): WorkerPool {
const threadsCount = ctx.config.watch
? Math.max(Math.floor(cpus().length / 2), 1)
: Math.max(cpus().length - 1, 1)
const maxThreads = ctx.config.maxThreads ?? threadsCount
const minThreads = ctx.config.minThreads ?? threadsCount
const options: TinypoolOptions = {
filename: workerPath,
// TODO: investigate further
// It seems atomics introduced V8 Fatal Error https://github.com/vitest-dev/vitest/issues/1191
useAtomics: false,
maxThreads,
minThreads,
}
if (ctx.config.isolate) {
options.isolateWorkers = true
options.concurrentTasksPerWorker = 1
}
if (!ctx.config.threads) {
options.concurrentTasksPerWorker = 1
options.maxThreads = 1
options.minThreads = 1
}
if (ctx.config.coverage.enabled)
process.env.NODE_V8_COVERAGE ||= ctx.config.coverage.tempDirectory
options.env = {
TEST: 'true',
VITEST: 'true',
NODE_ENV: ctx.config.mode || 'test',
VITEST_MODE: ctx.config.watch ? 'WATCH' : 'RUN',
...process.env,
...ctx.config.env,
}
const pool = new Tinypool(options)
const runWithFiles = (name: string): RunWithFiles => {
let id = 0
async function runFiles(config: ResolvedConfig, files: string[], invalidates: string[] = []) {
const { workerPort, port } = createChannel(ctx)
const workerId = ++id
const data: WorkerContext = {
port: workerPort,
config,
files,
invalidates,
workerId,
}
try {
await pool.run(data, { transferList: [workerPort], name })
}
finally {
port.close()
workerPort.close()
}
}
const Sequencer = ctx.config.sequence.sequencer
const sequencer = new Sequencer(ctx)
return async (files, invalidates) => {
const config = ctx.getSerializableConfig()
if (config.shard)
files = await sequencer.shard(files)
files = await sequencer.sort(files)
if (!ctx.config.threads) {
await runFiles(config, files)
}
else {
const results = await Promise.allSettled(files
.map(file => runFiles(config, [file], invalidates)))
const errors = results.filter((r): r is PromiseRejectedResult => r.status === 'rejected').map(r => r.reason)
if (errors.length > 0)
throw new AggregateError(errors, 'Errors occurred while running tests. For more information, see serialized error.')
}
}
}
return {
runTests: runWithFiles('run'),
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)
},
resolveSnapshotPath(testPath: string) {
return ctx.snapshot.resolvePath(testPath)
},
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)
},
onUnhandledRejection(err) {
ctx.state.catchError(err, 'Unhandled Rejection')
},
onFinished(files) {
ctx.report('onFinished', files, ctx.state.getUnhandledErrors())
},
},
{
post(v) {
port.postMessage(v)
},
on(fn) {
port.on('message', fn)
},
},
)
return { workerPort, port }
}