-import { AsyncResource } from 'async_hooks'
+import type { Worker } from 'cluster'
import { isMaster, worker } from 'cluster'
-import type { MessageValue } from '../utility-types'
+import type { JSONValue, MessageValue } from '../utility-types'
+import { AbstractWorker } from './abstract-worker'
import type { WorkerOptions } from './worker-options'
/**
- * An example worker that will be always alive, you just need to **extend** this class if you want a static pool.
+ * A cluster worker used by a poolifier `ClusterPool`.
*
- * When this worker is inactive for more than 1 minute, it will send this info to the main worker,
- * if you are using DynamicClusterPool, the workers created after will be killed, the min num of worker will be guaranteed.
+ * When this worker is inactive for more than the given `maxInactiveTime`,
+ * it will send a termination request to its main worker.
+ *
+ * If you use a `DynamicClusterPool` the extra workers that were created will be terminated,
+ * but the minimum number of workers will be guaranteed.
+ *
+ * @template Data Type of data this worker receives from pool's execution.
+ * @template Response Type of response the worker sends back to the main worker.
*
* @author [Christopher Quadflieg](https://github.com/Shinigami92)
* @since 2.0.0
*/
-// eslint-disable-next-line @typescript-eslint/no-explicit-any
-export class ClusterWorker<Data = any, Response = any> extends AsyncResource {
- protected readonly maxInactiveTime: number
- protected readonly async: boolean
- protected lastTask: number
- protected readonly interval?: NodeJS.Timeout
-
- public constructor (
- fn: (data: Data) => Response,
- public readonly opts: WorkerOptions = {}
- ) {
- super('worker-cluster-pool:pioardi')
-
- this.maxInactiveTime = this.opts.maxInactiveTime ?? 1000 * 60
- this.async = !!this.opts.async
- this.lastTask = Date.now()
- if (!fn) throw new Error('Fn parameter is mandatory')
- // keep the worker active
- if (!isMaster) {
- // console.log('ClusterWorker#constructor', 'is not master')
- this.interval = setInterval(
- this.checkAlive.bind(this),
- this.maxInactiveTime / 2
- )
- this.checkAlive.bind(this)()
- }
- worker.on('message', (value: MessageValue<Data>) => {
- // console.log("cluster.on('message', value)", value)
- if (value?.data && value.id) {
- // here you will receive messages
- // console.log('This is the main worker ' + isMaster)
- if (this.async) {
- this.runInAsyncScope(this.runAsync.bind(this), this, fn, value)
- } else {
- this.runInAsyncScope(this.run.bind(this), this, fn, value)
- }
- } else if (value.kill) {
- // here is time to kill this worker, just clearing the interval
- if (this.interval) clearInterval(this.interval)
- this.emitDestroy()
- }
- })
- }
-
- protected checkAlive (): void {
- if (Date.now() - this.lastTask > this.maxInactiveTime) {
- worker.send({ kill: 1 })
- }
+export class ClusterWorker<
+ Data extends JSONValue = JSONValue,
+ Response extends JSONValue = JSONValue
+> extends AbstractWorker<Worker, Data, Response> {
+ /**
+ * Constructs a new poolifier cluster worker.
+ *
+ * @param fn Function processed by the worker when the pool's `execution` function is invoked.
+ * @param opts Options for the worker.
+ */
+ public constructor (fn: (data: Data) => Response, opts: WorkerOptions = {}) {
+ super('worker-cluster-pool:pioardi', isMaster, fn, worker, opts)
}
- protected run (
- fn: (data?: Data) => Response,
- value: MessageValue<Data>
- ): void {
- try {
- const res = fn(value.data as Data)
- worker.send({ data: res, id: value.id })
- this.lastTask = Date.now()
- } catch (e) {
- const err = e instanceof Error ? e.message : e
- worker.send({ error: err, id: value.id })
- this.lastTask = Date.now()
- }
+ protected sendToMainWorker (message: MessageValue<Response>): void {
+ this.getMainWorker().send(message)
}
- protected runAsync (
- fn: (data?: Data) => Promise<Response>,
- value: MessageValue<Data>
- ): void {
- fn(value.data)
- .then(res => {
- worker.send({ data: res, id: value.id })
- this.lastTask = Date.now()
- return null
- })
- .catch(e => {
- const err = e instanceof Error ? e.message : e
- worker.send({ error: err, id: value.id })
- this.lastTask = Date.now()
- })
+ protected handleError (e: Error | string): string {
+ return e instanceof Error ? e.message : e
}
}