X-Git-Url: https://git.piment-noir.org/?a=blobdiff_plain;f=src%2Fworker%2Fabstract-worker.ts;h=54358ee64b58adfb1a4f9275f53a04185ea878e8;hb=b953022b2e57106ca7c52e641da5e03c2f9d5e07;hp=1ae7b65c7efbe67c6e9efafedd44301c5a80f15c;hpb=f2fdaa86fd9e6f3a5dc0b3146c065e3a7bfb44e0;p=poolifier.git diff --git a/src/worker/abstract-worker.ts b/src/worker/abstract-worker.ts index 1ae7b65c..54358ee6 100644 --- a/src/worker/abstract-worker.ts +++ b/src/worker/abstract-worker.ts @@ -1,89 +1,209 @@ import { AsyncResource } from 'async_hooks' +import type { Worker } from 'cluster' +import type { MessagePort } from 'worker_threads' import type { MessageValue } from '../utility-types' -import type { WorkerOptions } from './worker-options' +import { EMPTY_FUNCTION } from '../utils' +import type { KillBehavior, WorkerOptions } from './worker-options' +import { KillBehaviors } from './worker-options' +const DEFAULT_MAX_INACTIVE_TIME = 60000 +const DEFAULT_KILL_BEHAVIOR: KillBehavior = KillBehaviors.SOFT + +/** + * Base class that implements some shared logic for all poolifier workers. + * + * @template MainWorker Type of main worker. + * @template Data Type of data this worker receives from pool's execution. This can only be serializable data. + * @template Response Type of response the worker sends back to the main worker. This can only be serializable data. + */ export abstract class AbstractWorker< - MainWorker, + MainWorker extends Worker | MessagePort, Data = unknown, Response = unknown > extends AsyncResource { - protected readonly maxInactiveTime: number - protected readonly async: boolean - protected lastTask: number - protected readonly interval?: NodeJS.Timeout - /** + * Timestamp of the last task processed by this worker. + */ + protected lastTaskTimestamp: number + /** + * Handler Id of the `aliveInterval` worker alive check. + */ + protected readonly aliveInterval?: NodeJS.Timeout + /** + * Options for the worker. + */ + public readonly opts: WorkerOptions + /** + * Constructs a new poolifier worker. * * @param type The type of async event. - * @param isMain - * @param fn - * @param opts + * @param isMain Whether this is the main worker or not. + * @param fn Function processed by the worker when the pool's `execution` function is invoked. + * @param mainWorker Reference to main worker. + * @param opts Options for the worker. */ public constructor ( type: string, isMain: boolean, fn: (data: Data) => Response, - public readonly opts: WorkerOptions = {} + protected mainWorker: MainWorker | undefined | null, + opts: WorkerOptions = { + /** + * The kill behavior option on this Worker or its default value. + */ + killBehavior: DEFAULT_KILL_BEHAVIOR, + /** + * The maximum time to keep this worker alive while idle. + * The pool automatically checks and terminates this worker when the time expires. + */ + maxInactiveTime: DEFAULT_MAX_INACTIVE_TIME + } ) { super(type) - - 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 (!isMain) { - this.interval = setInterval( + this.opts = opts + this.checkFunctionInput(fn) + this.checkWorkerOptions(this.opts) + this.lastTaskTimestamp = Date.now() + // Keep the worker active + if (isMain === false) { + this.aliveInterval = setInterval( this.checkAlive.bind(this), - this.maxInactiveTime / 2 + (this.opts.maxInactiveTime ?? DEFAULT_MAX_INACTIVE_TIME) / 2 ) this.checkAlive.bind(this)() } + + this.mainWorker?.on('message', (value: MessageValue) => { + this.messageListener(value, fn) + }) + } + + protected messageListener ( + value: MessageValue, + fn: (data: Data) => Response + ): void { + if (value.data !== undefined && value.id !== undefined) { + // Here you will receive messages + if (this.opts.async === true) { + this.runInAsyncScope(this.runAsync.bind(this), this, fn, value) + } else { + this.runInAsyncScope(this.run.bind(this), this, fn, value) + } + } else if (value.parent !== undefined) { + // Save a reference of the main worker to communicate with it + // This will be received once + this.mainWorker = value.parent + } else if (value.kill !== undefined) { + // Here is time to kill this worker, just clearing the interval + if (this.aliveInterval) clearInterval(this.aliveInterval) + this.emitDestroy() + } + } + + private checkWorkerOptions (opts: WorkerOptions) { + this.opts.killBehavior = opts.killBehavior ?? DEFAULT_KILL_BEHAVIOR + this.opts.maxInactiveTime = + opts.maxInactiveTime ?? DEFAULT_MAX_INACTIVE_TIME + this.opts.async = !!opts.async + } + + /** + * Checks if the `fn` parameter is passed to the constructor. + * + * @param fn The function that should be defined. + */ + private checkFunctionInput (fn: (data: Data) => Response): void { + if (!fn) throw new Error('fn parameter is mandatory') } - protected abstract getMainWorker (): MainWorker + /** + * Returns the main worker. + * + * @returns Reference to the main worker. + */ + protected getMainWorker (): MainWorker { + if (!this.mainWorker) { + throw new Error('Main worker was not set') + } + return this.mainWorker + } + /** + * Sends a message to the main worker. + * + * @param message The response message. + */ protected abstract sendToMainWorker (message: MessageValue): void + /** + * Checks if the worker should be terminated, because its living too long. + */ protected checkAlive (): void { - if (Date.now() - this.lastTask > this.maxInactiveTime) { - this.sendToMainWorker({ kill: 1 }) + if ( + Date.now() - this.lastTaskTimestamp > + (this.opts.maxInactiveTime ?? DEFAULT_MAX_INACTIVE_TIME) + ) { + this.sendToMainWorker({ kill: this.opts.killBehavior }) } } + /** + * Handles an error and convert it to a string so it can be sent back to the main worker. + * + * @param e The error raised by the worker. + * @returns Message of the error. + */ protected handleError (e: Error | string): string { - return (e as unknown) as string + return e as string } + /** + * Runs the given function synchronously. + * + * @param fn Function that will be executed. + * @param value Input data for the given function. + */ protected run ( fn: (data?: Data) => Response, value: MessageValue ): void { try { + const startTaskTimestamp = Date.now() const res = fn(value.data) - this.sendToMainWorker({ data: res, id: value.id }) - this.lastTask = Date.now() + const taskRunTime = Date.now() - startTaskTimestamp + this.sendToMainWorker({ data: res, id: value.id, taskRunTime }) } catch (e) { - const err = this.handleError(e) + const err = this.handleError(e as Error) this.sendToMainWorker({ error: err, id: value.id }) - this.lastTask = Date.now() + } finally { + this.lastTaskTimestamp = Date.now() } } + /** + * Runs the given function asynchronously. + * + * @param fn Function that will be executed. + * @param value Input data for the given function. + */ protected runAsync ( fn: (data?: Data) => Promise, value: MessageValue ): void { + const startTaskTimestamp = Date.now() fn(value.data) .then(res => { - this.sendToMainWorker({ data: res, id: value.id }) - this.lastTask = Date.now() + const taskRunTime = Date.now() - startTaskTimestamp + this.sendToMainWorker({ data: res, id: value.id, taskRunTime }) return null }) .catch(e => { - const err = this.handleError(e) + const err = this.handleError(e as Error) this.sendToMainWorker({ error: err, id: value.id }) - this.lastTask = Date.now() }) + .finally(() => { + this.lastTaskTimestamp = Date.now() + }) + .catch(EMPTY_FUNCTION) } }