import { AsyncResource } from 'node:async_hooks'
import type { Worker } from 'node:cluster'
import type { MessagePort } from 'node:worker_threads'
-import { type EventLoopUtilization, performance } from 'node:perf_hooks'
+import { performance } from 'node:perf_hooks'
import type {
MessageValue,
- TaskFunctions,
- WorkerAsyncFunction,
- WorkerFunction,
- WorkerSyncFunction
+ TaskPerformance,
+ WorkerStatistics
} from '../utility-types'
import { EMPTY_FUNCTION, isPlainObject } from '../utils'
import {
KillBehaviors,
type WorkerOptions
} from './worker-options'
+import type {
+ TaskFunctions,
+ WorkerAsyncFunction,
+ WorkerFunction,
+ WorkerSyncFunction
+} from './worker-functions'
const DEFAULT_FUNCTION_NAME = 'default'
const DEFAULT_MAX_INACTIVE_TIME = 60000
const DEFAULT_KILL_BEHAVIOR: KillBehavior = KillBehaviors.SOFT
-interface TaskPerformance {
- timestamp: number
- waitTime: number
- runTime?: number
- elu: EventLoopUtilization
-}
-
/**
* Base class that implements some shared logic for all poolifier workers.
*
* @typeParam MainWorker - Type of main worker.
- * @typeParam Data - Type of data this worker receives from pool's execution. This can only be serializable data.
- * @typeParam Response - Type of response the worker sends back to the main worker. This can only be serializable data.
+ * @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.
*/
export abstract class AbstractWorker<
MainWorker extends Worker | MessagePort,
Data = unknown,
Response = unknown
> extends AsyncResource {
+ /**
+ * Worker id.
+ */
+ protected abstract id: number
/**
* Task function(s) processed by the worker when the pool's `execution` function is invoked.
*/
* Timestamp of the last task processed by this worker.
*/
protected lastTaskTimestamp!: number
+ /**
+ * Performance statistics computation requirements.
+ */
+ protected statistics!: WorkerStatistics
/**
* Handler id of the `aliveInterval` worker alive check.
*/
taskFunctions:
| WorkerFunction<Data, Response>
| TaskFunctions<Data, Response>,
- protected mainWorker: MainWorker | undefined | null,
+ protected readonly mainWorker: MainWorker,
protected readonly opts: WorkerOptions = {
/**
* The kill behavior option on this worker or its default value.
(this.opts.maxInactiveTime ?? DEFAULT_MAX_INACTIVE_TIME) / 2
)
this.checkAlive.bind(this)()
+ this.mainWorker?.on('message', this.messageListener.bind(this))
}
-
- this.mainWorker?.on('message', this.messageListener.bind(this))
}
private checkWorkerOptions (opts: WorkerOptions): void {
*
* @param message - Message received.
*/
- protected messageListener (message: MessageValue<Data, MainWorker>): void {
+ protected messageListener (message: MessageValue<Data, Data>): void {
if (message.id != null && message.data != null) {
// Task message received
const fn = this.getTaskFunction(message.name)
} else {
this.runInAsyncScope(this.runSync.bind(this), this, fn, message)
}
- } else if (message.parent != null) {
- // Main worker reference message received
- this.mainWorker = message.parent
+ } else if (message.statistics != null) {
+ // Statistics message received
+ this.statistics = message.statistics
} else if (message.kill != null) {
// Kill message received
this.aliveInterval != null && clearInterval(this.aliveInterval)
*/
protected getMainWorker (): MainWorker {
if (this.mainWorker == null) {
- throw new Error('Main worker was not set')
+ throw new Error('Main worker not set')
}
return this.mainWorker
}
*
* @param message - The response message.
*/
- protected abstract sendToMainWorker (message: MessageValue<Response>): void
+ protected abstract sendToMainWorker (
+ message: MessageValue<Response, Data>
+ ): void
/**
* Checks if the worker should be terminated, because its living too long.
* 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.
+ * @returns The error message.
*/
protected handleError (e: Error | string): string {
- return e as string
+ return e instanceof Error ? e.message : e
}
/**
message: MessageValue<Data>
): void {
try {
- const taskPerformance = this.beforeTaskRunHook(message)
+ let taskPerformance = this.beginTaskPerformance()
const res = fn(message.data)
- const { runTime, waitTime, elu } = this.afterTaskRunHook(taskPerformance)
+ taskPerformance = this.endTaskPerformance(taskPerformance)
this.sendToMainWorker({
data: res,
- runTime,
- waitTime,
- elu,
+ taskPerformance,
+ workerId: this.id,
id: message.id
})
} catch (e) {
- const err = this.handleError(e as Error)
+ const errorMessage = this.handleError(e as Error | string)
this.sendToMainWorker({
- error: err,
- errorData: message.data,
+ taskError: {
+ workerId: this.id,
+ message: errorMessage,
+ data: message.data
+ },
id: message.id
})
} finally {
fn: WorkerAsyncFunction<Data, Response>,
message: MessageValue<Data>
): void {
- const taskPerformance = this.beforeTaskRunHook(message)
+ let taskPerformance = this.beginTaskPerformance()
fn(message.data)
.then(res => {
- const { runTime, waitTime, elu } =
- this.afterTaskRunHook(taskPerformance)
+ taskPerformance = this.endTaskPerformance(taskPerformance)
this.sendToMainWorker({
data: res,
- runTime,
- waitTime,
- elu,
+ taskPerformance,
+ workerId: this.id,
id: message.id
})
return null
})
.catch(e => {
- const err = this.handleError(e as Error)
+ const errorMessage = this.handleError(e as Error | string)
this.sendToMainWorker({
- error: err,
- errorData: message.data,
+ taskError: {
+ workerId: this.id,
+ message: errorMessage,
+ data: message.data
+ },
id: message.id
})
})
return fn
}
- private beforeTaskRunHook (message: MessageValue<Data>): TaskPerformance {
- // TODO: conditional accounting
- const timestamp = performance.now()
+ private beginTaskPerformance (): TaskPerformance {
+ this.checkStatistics()
return {
- timestamp,
- waitTime: timestamp - (message.submissionTimestamp ?? 0),
- elu: performance.eventLoopUtilization()
+ timestamp: performance.now(),
+ ...(this.statistics.elu && { elu: performance.eventLoopUtilization() })
}
}
- private afterTaskRunHook (taskPerformance: TaskPerformance): TaskPerformance {
+ private endTaskPerformance (
+ taskPerformance: TaskPerformance
+ ): TaskPerformance {
+ this.checkStatistics()
return {
...taskPerformance,
- ...{
- runTime: performance.now() - taskPerformance.timestamp,
+ ...(this.statistics.runTime && {
+ runTime: performance.now() - taskPerformance.timestamp
+ }),
+ ...(this.statistics.elu && {
elu: performance.eventLoopUtilization(taskPerformance.elu)
- }
+ })
+ }
+ }
+
+ private checkStatistics (): void {
+ if (this.statistics == null) {
+ throw new Error('Performance statistics computation requirements not set')
}
}
}
repositories / poolifier.git / blobdiff