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abstract-worker.ts
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import type { Worker } from 'node:cluster'
import { performance } from 'node:perf_hooks'
import type { MessagePort } from 'node:worker_threads'
import type {
MessageValue,
Task,
TaskFunctionProperties,
TaskPerformance,
WorkerStatistics
} from '../utility-types.js'
import {
buildTaskFunctionProperties,
DEFAULT_TASK_NAME,
EMPTY_FUNCTION,
isAsyncFunction,
isPlainObject
} from '../utils.js'
import type {
TaskAsyncFunction,
TaskFunction,
TaskFunctionObject,
TaskFunctionOperationResult,
TaskFunctions,
TaskSyncFunction
} from './task-functions.js'
import {
checkTaskFunctionName,
checkValidTaskFunctionObjectEntry,
checkValidWorkerOptions
} from './utils.js'
import { KillBehaviors, type WorkerOptions } from './worker-options.js'
const DEFAULT_MAX_INACTIVE_TIME = 60000
const DEFAULT_WORKER_OPTIONS: WorkerOptions = {
/**
* The kill behavior option on this worker or its default value.
*/
killBehavior: KillBehaviors.SOFT,
/**
* The maximum time to keep this worker active while idle.
* The pool automatically checks and terminates this worker when the time expires.
*/
maxInactiveTime: DEFAULT_MAX_INACTIVE_TIME,
/**
* The function to call when the worker is killed.
*/
killHandler: EMPTY_FUNCTION
}
/**
* 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 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
> {
/**
* Worker id.
*/
protected abstract id: number
/**
* Task function object(s) processed by the worker when the pool's `execution` function is invoked.
*/
protected taskFunctions!: Map<string, TaskFunctionObject<Data, Response>>
/**
* Timestamp of the last task processed by this worker.
*/
protected lastTaskTimestamp!: number
/**
* Performance statistics computation requirements.
*/
protected statistics?: WorkerStatistics
/**
* Handler id of the `activeInterval` worker activity check.
*/
protected activeInterval?: NodeJS.Timeout
/**
* Constructs a new poolifier worker.
*
* @param isMain - Whether this is the main worker or not.
* @param mainWorker - Reference to main worker.
* @param taskFunctions - Task function(s) processed by the worker when the pool's `execution` function is invoked. The first function is the default function.
* @param opts - Options for the worker.
*/
public constructor (
protected readonly isMain: boolean | undefined,
private readonly mainWorker: MainWorker | undefined | null,
taskFunctions: TaskFunction<Data, Response> | TaskFunctions<Data, Response>,
protected opts: WorkerOptions = DEFAULT_WORKER_OPTIONS
) {
if (this.isMain == null) {
throw new Error('isMain parameter is mandatory')
}
this.checkTaskFunctions(taskFunctions)
this.checkWorkerOptions(this.opts)
if (!this.isMain) {
// Should be once() but Node.js on windows has a bug that prevents it from working
this.getMainWorker().on('message', this.handleReadyMessage.bind(this))
}
}
private checkWorkerOptions (opts: WorkerOptions): void {
checkValidWorkerOptions(opts)
this.opts = { ...DEFAULT_WORKER_OPTIONS, ...opts }
}
/**
* Checks if the `taskFunctions` parameter is passed to the constructor and valid.
*
* @param taskFunctions - The task function(s) parameter that should be checked.
*/
private checkTaskFunctions (
taskFunctions:
| TaskFunction<Data, Response>
| TaskFunctions<Data, Response>
| undefined
): void {
if (taskFunctions == null) {
throw new Error('taskFunctions parameter is mandatory')
}
this.taskFunctions = new Map<string, TaskFunctionObject<Data, Response>>()
if (typeof taskFunctions === 'function') {
const fnObj = { taskFunction: taskFunctions.bind(this) }
this.taskFunctions.set(DEFAULT_TASK_NAME, fnObj)
this.taskFunctions.set(
typeof taskFunctions.name === 'string' &&
taskFunctions.name.trim().length > 0
? taskFunctions.name
: 'fn1',
fnObj
)
} else if (isPlainObject(taskFunctions)) {
let firstEntry = true
for (let [name, fnObj] of Object.entries(taskFunctions)) {
if (typeof fnObj === 'function') {
fnObj = { taskFunction: fnObj } satisfies TaskFunctionObject<
Data,
Response
>
}
checkValidTaskFunctionObjectEntry<Data, Response>(name, fnObj)
fnObj.taskFunction = fnObj.taskFunction.bind(this)
if (firstEntry) {
this.taskFunctions.set(DEFAULT_TASK_NAME, fnObj)
firstEntry = false
}
this.taskFunctions.set(name, fnObj)
}
if (firstEntry) {
throw new Error('taskFunctions parameter object is empty')
}
} else {
throw new TypeError(
'taskFunctions parameter is not a function or a plain object'
)
}
}
/**
* Checks if the worker has a task function with the given name.
*
* @param name - The name of the task function to check.
* @returns Whether the worker has a task function with the given name or not.
*/
public hasTaskFunction (name: string): TaskFunctionOperationResult {
try {
checkTaskFunctionName(name)
} catch (error) {
return { status: false, error: error as Error }
}
return { status: this.taskFunctions.has(name) }
}
/**
* Adds a task function to the worker.
* If a task function with the same name already exists, it is replaced.
*
* @param name - The name of the task function to add.
* @param fn - The task function to add.
* @returns Whether the task function was added or not.
*/
public addTaskFunction (
name: string,
fn: TaskFunction<Data, Response> | TaskFunctionObject<Data, Response>
): TaskFunctionOperationResult {
try {
checkTaskFunctionName(name)
if (name === DEFAULT_TASK_NAME) {
throw new Error(
'Cannot add a task function with the default reserved name'
)
}
if (typeof fn === 'function') {
fn = { taskFunction: fn } satisfies TaskFunctionObject<Data, Response>
}
checkValidTaskFunctionObjectEntry<Data, Response>(name, fn)
fn.taskFunction = fn.taskFunction.bind(this)
if (
this.taskFunctions.get(name) ===
this.taskFunctions.get(DEFAULT_TASK_NAME)
) {
this.taskFunctions.set(DEFAULT_TASK_NAME, fn)
}
this.taskFunctions.set(name, fn)
this.sendTaskFunctionsPropertiesToMainWorker()
return { status: true }
} catch (error) {
return { status: false, error: error as Error }
}
}
/**
* Removes a task function from the worker.
*
* @param name - The name of the task function to remove.
* @returns Whether the task function existed and was removed or not.
*/
public removeTaskFunction (name: string): TaskFunctionOperationResult {
try {
checkTaskFunctionName(name)
if (name === DEFAULT_TASK_NAME) {
throw new Error(
'Cannot remove the task function with the default reserved name'
)
}
if (
this.taskFunctions.get(name) ===
this.taskFunctions.get(DEFAULT_TASK_NAME)
) {
throw new Error(
'Cannot remove the task function used as the default task function'
)
}
const deleteStatus = this.taskFunctions.delete(name)
this.sendTaskFunctionsPropertiesToMainWorker()
return { status: deleteStatus }
} catch (error) {
return { status: false, error: error as Error }
}
}
/**
* Lists the properties of the worker's task functions.
*
* @returns The properties of the worker's task functions.
*/
public listTaskFunctionsProperties (): TaskFunctionProperties[] {
let defaultTaskFunctionName = DEFAULT_TASK_NAME
for (const [name, fnObj] of this.taskFunctions) {
if (
name !== DEFAULT_TASK_NAME &&
fnObj === this.taskFunctions.get(DEFAULT_TASK_NAME)
) {
defaultTaskFunctionName = name
break
}
}
const taskFunctionsProperties: TaskFunctionProperties[] = []
for (const [name, fnObj] of this.taskFunctions) {
if (name === DEFAULT_TASK_NAME || name === defaultTaskFunctionName) {
continue
}
taskFunctionsProperties.push(buildTaskFunctionProperties(name, fnObj))
}
return [
buildTaskFunctionProperties(
DEFAULT_TASK_NAME,
this.taskFunctions.get(DEFAULT_TASK_NAME)
),
buildTaskFunctionProperties(
defaultTaskFunctionName,
this.taskFunctions.get(defaultTaskFunctionName)
),
...taskFunctionsProperties
]
}
/**
* Sets the default task function to use in the worker.
*
* @param name - The name of the task function to use as default task function.
* @returns Whether the default task function was set or not.
*/
public setDefaultTaskFunction (name: string): TaskFunctionOperationResult {
try {
checkTaskFunctionName(name)
if (name === DEFAULT_TASK_NAME) {
throw new Error(
'Cannot set the default task function reserved name as the default task function'
)
}
if (!this.taskFunctions.has(name)) {
throw new Error(
'Cannot set the default task function to a non-existing task function'
)
}
// eslint-disable-next-line @typescript-eslint/no-non-null-assertion
this.taskFunctions.set(DEFAULT_TASK_NAME, this.taskFunctions.get(name)!)
this.sendTaskFunctionsPropertiesToMainWorker()
return { status: true }
} catch (error) {
return { status: false, error: error as Error }
}
}
/**
* Handles the ready message sent by the main worker.
*
* @param message - The ready message.
*/
protected abstract handleReadyMessage (message: MessageValue<Data>): void
/**
* Worker message listener.
*
* @param message - The received message.
*/
protected messageListener (message: MessageValue<Data>): void {
this.checkMessageWorkerId(message)
const {
statistics,
checkActive,
taskFunctionOperation,
taskId,
data,
kill
} = message
if (statistics != null) {
// Statistics message received
this.statistics = statistics
} else if (checkActive != null) {
// Check active message received
checkActive ? this.startCheckActive() : this.stopCheckActive()
} else if (taskFunctionOperation != null) {
// Task function operation message received
this.handleTaskFunctionOperationMessage(message)
} else if (taskId != null && data != null) {
// Task message received
this.run(message)
} else if (kill === true) {
// Kill message received
this.handleKillMessage(message)
}
}
protected handleTaskFunctionOperationMessage (
message: MessageValue<Data>
): void {
const { taskFunctionOperation, taskFunctionProperties, taskFunction } =
message
if (taskFunctionProperties == null) {
throw new Error(
'Cannot handle task function operation message without task function properties'
)
}
let response: TaskFunctionOperationResult
switch (taskFunctionOperation) {
case 'add':
response = this.addTaskFunction(taskFunctionProperties.name, {
// eslint-disable-next-line @typescript-eslint/no-implied-eval, no-new-func
taskFunction: new Function(
`return ${taskFunction}`
)() as TaskFunction<Data, Response>,
...(taskFunctionProperties.priority != null && {
priority: taskFunctionProperties.priority
}),
...(taskFunctionProperties.strategy != null && {
strategy: taskFunctionProperties.strategy
})
})
break
case 'remove':
response = this.removeTaskFunction(taskFunctionProperties.name)
break
case 'default':
response = this.setDefaultTaskFunction(taskFunctionProperties.name)
break
default:
response = { status: false, error: new Error('Unknown task operation') }
break
}
this.sendToMainWorker({
taskFunctionOperation,
taskFunctionOperationStatus: response.status,
taskFunctionProperties,
...(!response.status &&
response.error != null && {
workerError: {
name: taskFunctionProperties.name,
message: this.handleError(response.error as Error | string)
}
})
})
}
/**
* Handles a kill message sent by the main worker.
*
* @param message - The kill message.
*/
protected handleKillMessage (_message: MessageValue<Data>): void {
this.stopCheckActive()
if (isAsyncFunction(this.opts.killHandler)) {
(this.opts.killHandler() as Promise<void>)
.then(() => {
this.sendToMainWorker({ kill: 'success' })
return undefined
})
.catch(() => {
this.sendToMainWorker({ kill: 'failure' })
})
} else {
try {
// eslint-disable-next-line @typescript-eslint/no-invalid-void-type
this.opts.killHandler?.() as void
this.sendToMainWorker({ kill: 'success' })
} catch {
this.sendToMainWorker({ kill: 'failure' })
}
}
}
/**
* Check if the message worker id is set and matches the worker id.
*
* @param message - The message to check.
* @throws {@link https://nodejs.org/api/errors.html#class-error} If the message worker id is not set or does not match the worker id.
*/
private checkMessageWorkerId (message: MessageValue<Data>): void {
if (message.workerId == null) {
throw new Error('Message worker id is not set')
} else if (message.workerId !== this.id) {
throw new Error(
`Message worker id ${message.workerId} does not match the worker id ${this.id}`
)
}
}
/**
* Starts the worker check active interval.
*/
private startCheckActive (): void {
this.lastTaskTimestamp = performance.now()
this.activeInterval = setInterval(
this.checkActive.bind(this),
(this.opts.maxInactiveTime ?? DEFAULT_MAX_INACTIVE_TIME) / 2
)
}
/**
* Stops the worker check active interval.
*/
private stopCheckActive (): void {
if (this.activeInterval != null) {
clearInterval(this.activeInterval)
delete this.activeInterval
}
}
/**
* Checks if the worker should be terminated, because its living too long.
*/
private checkActive (): void {
if (
performance.now() - this.lastTaskTimestamp >
(this.opts.maxInactiveTime ?? DEFAULT_MAX_INACTIVE_TIME)
) {
this.sendToMainWorker({ kill: this.opts.killBehavior })
}
}
/**
* Returns the main worker.
*
* @returns Reference to the main worker.
* @throws {@link https://nodejs.org/api/errors.html#class-error} If the main worker is not set.
*/
protected getMainWorker (): MainWorker {
if (this.mainWorker == null) {
throw new Error('Main worker not set')
}
return this.mainWorker
}
/**
* Sends a message to main worker.
*
* @param message - The response message.
*/
protected abstract sendToMainWorker (
message: MessageValue<Response, Data>
): void
/**
* Sends task functions properties to the main worker.
*/
protected sendTaskFunctionsPropertiesToMainWorker (): void {
this.sendToMainWorker({
taskFunctionsProperties: this.listTaskFunctionsProperties()
})
}
/**
* Handles an error and convert it to a string so it can be sent back to the main worker.
*
* @param error - The error raised by the worker.
* @returns The error message.
*/
protected handleError (error: Error | string): string {
return error instanceof Error ? error.message : error
}
/**
* Runs the given task.
*
* @param task - The task to execute.
*/
protected readonly run = (task: Task<Data>): void => {
const { name, taskId, data } = task
const taskFunctionName = name ?? DEFAULT_TASK_NAME
if (!this.taskFunctions.has(taskFunctionName)) {
this.sendToMainWorker({
workerError: {
// eslint-disable-next-line @typescript-eslint/no-non-null-assertion
name: name!,
message: `Task function '${name}' not found`,
data
},
taskId
})
return
}
const fn = this.taskFunctions.get(taskFunctionName)?.taskFunction
if (isAsyncFunction(fn)) {
this.runAsync(fn as TaskAsyncFunction<Data, Response>, task)
} else {
this.runSync(fn as TaskSyncFunction<Data, Response>, task)
}
}
/**
* Runs the given task function synchronously.
*
* @param fn - Task function that will be executed.
* @param task - Input data for the task function.
*/
protected readonly runSync = (
fn: TaskSyncFunction<Data, Response>,
task: Task<Data>
): void => {
const { name, taskId, data } = task
try {
let taskPerformance = this.beginTaskPerformance(name)
const res = fn(data)
taskPerformance = this.endTaskPerformance(taskPerformance)
this.sendToMainWorker({
data: res,
taskPerformance,
taskId
})
} catch (error) {
this.sendToMainWorker({
workerError: {
// eslint-disable-next-line @typescript-eslint/no-non-null-assertion
name: name!,
message: this.handleError(error as Error | string),
data
},
taskId
})
} finally {
this.updateLastTaskTimestamp()
}
}
/**
* Runs the given task function asynchronously.
*
* @param fn - Task function that will be executed.
* @param task - Input data for the task function.
*/
protected readonly runAsync = (
fn: TaskAsyncFunction<Data, Response>,
task: Task<Data>
): void => {
const { name, taskId, data } = task
let taskPerformance = this.beginTaskPerformance(name)
fn(data)
.then(res => {
taskPerformance = this.endTaskPerformance(taskPerformance)
this.sendToMainWorker({
data: res,
taskPerformance,
taskId
})
return undefined
})
.catch((error: unknown) => {
this.sendToMainWorker({
workerError: {
// eslint-disable-next-line @typescript-eslint/no-non-null-assertion
name: name!,
message: this.handleError(error as Error | string),
data
},
taskId
})
})
.finally(() => {
this.updateLastTaskTimestamp()
})
.catch(EMPTY_FUNCTION)
}
private beginTaskPerformance (name?: string): TaskPerformance {
if (this.statistics == null) {
throw new Error('Performance statistics computation requirements not set')
}
return {
name: name ?? DEFAULT_TASK_NAME,
timestamp: performance.now(),
...(this.statistics.elu && {
elu: performance.eventLoopUtilization()
})
}
}
private endTaskPerformance (
taskPerformance: TaskPerformance
): TaskPerformance {
if (this.statistics == null) {
throw new Error('Performance statistics computation requirements not set')
}
return {
...taskPerformance,
...(this.statistics.runTime && {
runTime: performance.now() - taskPerformance.timestamp
}),
...(this.statistics.elu && {
elu: performance.eventLoopUtilization(taskPerformance.elu)
})
}
}
private updateLastTaskTimestamp (): void {
if (this.activeInterval != null) {
this.lastTaskTimestamp = performance.now()
}
}
}