-import type { SendHandle } from 'child_process'
-import { fork, isMaster, setupMaster, Worker } from 'cluster'
-import type { MessageValue } from '../../utility-types'
+import cluster, { type Worker } from 'node:cluster'
-export type WorkerWithMessageChannel = Worker // & Draft<MessageChannel>
+import type { MessageValue } from '../../utility-types.js'
+import { AbstractPool } from '../abstract-pool.js'
+import { type PoolOptions, type PoolType, PoolTypes } from '../pool.js'
+import { type WorkerType, WorkerTypes } from '../worker.js'
-export interface FixedClusterPoolOptions {
- /**
- * A function that will listen for error event on each worker.
- */
- errorHandler?: (this: Worker, e: Error) => void
- /**
- * A function that will listen for online event on each worker.
- */
- onlineHandler?: (this: Worker) => void
- /**
- * A function that will listen for exit event on each worker.
- */
- exitHandler?: (this: Worker, code: number) => void
- /**
- * This is just to avoid not useful warnings message, is used to set `maxListeners` on event emitters (workers are event emitters).
- *
- * @default 1000
- */
- maxTasks?: number
- /**
- * Key/value pairs to add to worker process environment.
- *
- * @see https://nodejs.org/api/cluster.html#cluster_cluster_fork_env
- */
- // eslint-disable-next-line @typescript-eslint/no-explicit-any
- env?: any
-}
+/**
+ * Options for a poolifier cluster pool.
+ */
+export type ClusterPoolOptions = PoolOptions<Worker>
/**
- * A cluster pool with a static number of workers, is possible to execute tasks in sync or async mode as you prefer.
- *
- * This pool will select the worker in a round robin fashion.
+ * A cluster pool with a fixed number of workers.
*
+ * @typeParam Data - Type of data sent to the worker. This can only be structured-cloneable data.
+ * @typeParam Response - Type of execution response. This can only be structured-cloneable data.
* @author [Christopher Quadflieg](https://github.com/Shinigami92)
* @since 2.0.0
*/
-// eslint-disable-next-line @typescript-eslint/no-explicit-any
-export class FixedClusterPool<Data = any, Response = any> {
- public readonly workers: WorkerWithMessageChannel[] = []
- public nextWorker: number = 0
-
- // workerId as key and an integer value
- public readonly tasks: Map<WorkerWithMessageChannel, number> = new Map<
- WorkerWithMessageChannel,
- number
- >()
-
- protected id: number = 0
-
+export class FixedClusterPool<
+ Data = unknown,
+ Response = unknown
+> extends AbstractPool<Worker, Data, Response> {
/**
- * @param numWorkers Number of workers for this pool.
- * @param filePath A file path with implementation of `ClusterWorker` class, relative path is fine.
- * @param opts An object with possible options for example `errorHandler`, `onlineHandler`. Default: `{ maxTasks: 1000 }`
+ * Constructs a new poolifier fixed cluster pool.
+ *
+ * @param numberOfWorkers - Number of workers for this pool.
+ * @param filePath - Path to an implementation of a `ClusterWorker` file, which can be relative or absolute.
+ * @param opts - Options for this fixed cluster pool.
*/
public constructor (
- public readonly numWorkers: number,
- public readonly filePath: string,
- public readonly opts: FixedClusterPoolOptions = { maxTasks: 1000 }
+ numberOfWorkers: number,
+ filePath: string,
+ opts: ClusterPoolOptions = {},
+ maximumNumberOfWorkers?: number
) {
- if (!isMaster) {
- throw new Error('Cannot start a cluster pool from a worker!')
- }
- // TODO christopher 2021-02-09: Improve this check e.g. with a pattern or blank check
- if (!this.filePath) {
- throw new Error('Please specify a file with a worker implementation')
- }
+ super(numberOfWorkers, filePath, opts, maximumNumberOfWorkers)
+ }
+
+ /** @inheritDoc */
+ protected setupHook (): void {
+ cluster.setupPrimary({ ...this.opts.settings, exec: this.filePath })
+ }
+
+ /** @inheritDoc */
+ protected isMain (): boolean {
+ return cluster.isPrimary
+ }
+
+ /** @inheritDoc */
+ protected sendToWorker (
+ workerNodeKey: number,
+ message: MessageValue<Data>
+ ): void {
+ this.workerNodes[workerNodeKey]?.worker.send({
+ ...message,
+ workerId: this.getWorkerInfo(workerNodeKey)?.id
+ } satisfies MessageValue<Data>)
+ }
- setupMaster({
- exec: this.filePath
+ /** @inheritDoc */
+ protected sendStartupMessageToWorker (workerNodeKey: number): void {
+ this.sendToWorker(workerNodeKey, {
+ ready: false
})
+ }
- for (let i = 1; i <= this.numWorkers; i++) {
- this.newWorker()
- }
+ /** @inheritDoc */
+ protected registerWorkerMessageListener<Message extends Data | Response>(
+ workerNodeKey: number,
+ listener: (message: MessageValue<Message>) => void
+ ): void {
+ this.workerNodes[workerNodeKey].worker.on('message', listener)
}
- public destroy (): void {
- for (const worker of this.workers) {
- worker.kill()
- }
+ /** @inheritDoc */
+ protected registerOnceWorkerMessageListener<Message extends Data | Response>(
+ workerNodeKey: number,
+ listener: (message: MessageValue<Message>) => void
+ ): void {
+ this.workerNodes[workerNodeKey].worker.once('message', listener)
}
- /**
- * Execute the task specified into the constructor with the data parameter.
- *
- * @param data The input for the task specified.
- * @returns Promise that is resolved when the task is done.
- */
- public execute (data: Data): Promise<Response> {
- // configure worker to handle message with the specified task
- const worker: WorkerWithMessageChannel = this.chooseWorker()
- // console.log('FixedClusterPool#execute choosen worker:', worker)
- const previousWorkerIndex = this.tasks.get(worker)
- if (previousWorkerIndex !== undefined) {
- this.tasks.set(worker, previousWorkerIndex + 1)
- } else {
- throw Error('Worker could not be found in tasks map')
- }
- const id: number = ++this.id
- const res: Promise<Response> = this.internalExecute(worker, id)
- // console.log('FixedClusterPool#execute send data to worker:', worker)
- worker.send({ data: data || {}, id: id })
- return res
+ /** @inheritDoc */
+ protected deregisterWorkerMessageListener<Message extends Data | Response>(
+ workerNodeKey: number,
+ listener: (message: MessageValue<Message>) => void
+ ): void {
+ this.workerNodes[workerNodeKey].worker.off('message', listener)
}
- protected internalExecute (
- worker: WorkerWithMessageChannel,
- id: number
- ): Promise<Response> {
- return new Promise((resolve, reject) => {
- const listener: (
- message: MessageValue<Response>,
- handle: SendHandle
- ) => void = message => {
- // console.log('FixedClusterPool#internalExecute listener:', message)
- if (message.id === id) {
- worker.removeListener('message', listener)
- const previousWorkerIndex = this.tasks.get(worker)
- if (previousWorkerIndex !== undefined) {
- this.tasks.set(worker, previousWorkerIndex + 1)
- } else {
- throw Error('Worker could not be found in tasks map')
- }
- if (message.error) reject(message.error)
- else resolve(message.data as Response)
- }
- }
- worker.on('message', listener)
- })
+ /** @inheritDoc */
+ protected shallCreateDynamicWorker (): boolean {
+ return false
+ }
+
+ /** @inheritDoc */
+ protected checkAndEmitDynamicWorkerCreationEvents (): void {
+ /* noop */
+ }
+
+ /** @inheritDoc */
+ protected get type (): PoolType {
+ return PoolTypes.fixed
}
- protected chooseWorker (): WorkerWithMessageChannel {
- if (this.workers.length - 1 === this.nextWorker) {
- this.nextWorker = 0
- return this.workers[this.nextWorker]
- } else {
- this.nextWorker++
- return this.workers[this.nextWorker]
- }
+ /** @inheritDoc */
+ protected get worker (): WorkerType {
+ return WorkerTypes.cluster
}
- protected newWorker (): WorkerWithMessageChannel {
- const worker: WorkerWithMessageChannel = fork(this.opts.env)
- worker.on('error', this.opts.errorHandler ?? (() => {}))
- worker.on('online', this.opts.onlineHandler ?? (() => {}))
- // TODO handle properly when a worker exit
- worker.on('exit', this.opts.exitHandler ?? (() => {}))
- this.workers.push(worker)
- // we will attach a listener for every task,
- // when task is completed the listener will be removed but to avoid warnings we are increasing the max listeners size
- worker.setMaxListeners(this.opts.maxTasks ?? 1000)
- // init tasks map
- this.tasks.set(worker, 0)
- return worker
+ /** @inheritDoc */
+ protected get busy (): boolean {
+ return this.internalBusy()
}
}
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