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import { WritableStreamBuffer } from 'stream-buffers'
import WorkerInstance from './worker'
import { SHUTDOWN_TIMEOUT, BUFFER_OPTIONS } from './constants'
const log = logger('@wdio/local-runner')
export default class LocalRunner {
constructor (configFile, config) {
this.configFile = configFile
this.config = config
this.workerPool = {}
this.stdout = new WritableStreamBuffer(BUFFER_OPTIONS)
this.stderr = new WritableStreamBuffer(BUFFER_OPTIONS)
}
/**
* nothing to initialise when running locally
*/
initialise () {}
getWorkerCount () {
return Object.keys(this.workerPool).length
}
run ({ command, argv, ...options }) {
/**
* adjust max listeners on stdout/stderr when creating listeners
*/
const workerCnt = this.getWorkerCount()
Iif (workerCnt >= process.stdout.getMaxListeners() - 2) {
process.stdout.setMaxListeners(workerCnt + 2)
process.stderr.setMaxListeners(workerCnt + 2)
}
const worker = new WorkerInstance(this.config, options, this.stdout, this.stderr)
this.workerPool[options.cid] = worker
worker.postMessage(command, argv)
return worker
}
/**
* shutdown all worker processes
*
* @return {Promise} resolves when all worker have been shutdown or
* a timeout was reached
*/
shutdown () {
log.info('Shutting down spawned worker')
for (const [cid, worker] of Object.entries(this.workerPool)) {
const { caps, server, sessionId, config, isMultiremote, instances } = worker
let payload = {}
/**
* put connection information to payload if in watch mode
* in order to attach to browser session and kill it
*/
if (config && config.watch && (sessionId || isMultiremote)) {
payload = { config: { ...server, sessionId }, caps, watch: true, isMultiremote, instances }
} else if (!worker.isBusy) {
delete this.workerPool[cid]
continue
}
worker.postMessage('endSession', payload)
}
return new Promise((resolve) => {
const interval = setInterval(() => {
const busyWorker = Object.entries(this.workerPool)
.filter(([, worker]) => worker.isBusy).length
log.info(`Waiting for ${busyWorker} to shut down gracefully`)
if (busyWorker === 0) {
clearInterval(interval)
log.info('shutting down')
return resolve()
}
}, 250)
setTimeout(resolve, SHUTDOWN_TIMEOUT)
})
}
}
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