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cluster-worker.ts
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cluster-worker.ts
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import cluster, { type Worker } from 'node:cluster'
import type { MessageValue } from '../utility-types.js'
import { AbstractWorker } from './abstract-worker.js'
import type { TaskFunction, TaskFunctions } from './task-functions.js'
import type { WorkerOptions } from './worker-options.js'
/**
* A cluster worker used by a poolifier `ClusterPool`.
*
* 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.
*
* @typeParam Data - Type of data this worker receives from pool's execution. This can only be structured-cloneable data.
* @typeParam Response - Type of response the worker sends back to the main worker. This can only be structured-cloneable data.
* @author [Christopher Quadflieg](https://github.com/Shinigami92)
* @since 2.0.0
*/
export class ClusterWorker<
Data = unknown,
Response = unknown
> extends AbstractWorker<Worker, Data, Response> {
/**
* Constructs a new poolifier cluster worker.
*
* @param taskFunctions - Task function(s) processed by the worker when the pool's `execution` function is invoked.
* @param opts - Options for the worker.
*/
public constructor (
taskFunctions: TaskFunction<Data, Response> | TaskFunctions<Data, Response>,
opts: WorkerOptions = {}
) {
super(cluster.isPrimary, cluster.worker, taskFunctions, opts)
}
/** @inheritDoc */
protected handleReadyMessage (message: MessageValue<Data>): void {
if (message.workerId === this.id && message.ready === false) {
try {
this.getMainWorker().on('message', this.messageListener.bind(this))
this.sendToMainWorker({
ready: true,
taskFunctionsProperties: this.listTaskFunctionsProperties()
})
} catch {
this.sendToMainWorker({
ready: false,
taskFunctionsProperties: this.listTaskFunctionsProperties()
})
}
}
}
/** @inheritDoc */
protected get id (): number {
return this.getMainWorker().id
}
/** @inheritDoc */
protected readonly sendToMainWorker = (
message: MessageValue<Response>
): void => {
this.getMainWorker().send({
...message,
workerId: this.id
} satisfies MessageValue<Response>)
}
}