@xylabs/threads
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Web workers & worker threads as simple as a function call
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{"version":3,"sources":["../../../src/master/pool-browser.ts","../../../src/master/implementation.browser.ts","../../../src/master/pool-types.ts","../../../src/symbols.ts","../../../src/master/thread.ts"],"sourcesContent":["/* eslint-disable import-x/export */\n/* eslint-disable unicorn/no-thenable */\n\n/* eslint-disable @typescript-eslint/member-ordering */\n/* eslint-disable unicorn/no-array-reduce */\n/* eslint-disable @typescript-eslint/no-explicit-any */\n/* eslint-disable @typescript-eslint/no-namespace */\n\n/// <reference lib=\"esnext\" />\n\nimport DebugLogger from 'debug'\nimport {\n multicast, Observable, Subject,\n} from 'observable-fns'\n\nimport { defaultPoolSize } from './implementation.browser.ts'\nimport type {\n PoolEvent, QueuedTask, TaskRunFunction, WorkerDescriptor,\n} from './pool-types.ts'\nimport { PoolEventType } from './pool-types.ts'\nimport { Thread } from './thread.ts'\n\nexport declare namespace Pool {\n type Event<ThreadType extends Thread = any> = PoolEvent<ThreadType>\n type EventType = PoolEventType\n}\n\nlet nextPoolID = 1\n\nfunction createArray(size: number): number[] {\n const array: number[] = []\n for (let index = 0; index < size; index++) {\n array.push(index)\n }\n return array\n}\n\nfunction delay(ms: number) {\n return new Promise(resolve => setTimeout(resolve, ms))\n}\n\nfunction flatMap<In, Out>(array: In[], mapper: (element: In) => Out[]): Out[] {\n return array.reduce<Out[]>((flattened, element) => [...flattened, ...mapper(element)], [])\n}\n\nfunction slugify(text: string) {\n return text.replaceAll(/\\W/g, ' ').trim().replaceAll(/\\s+/g, '-')\n}\n\nfunction spawnWorkers<ThreadType extends Thread>(spawnWorker: () => Promise<ThreadType>, count: number): Array<WorkerDescriptor<ThreadType>> {\n return createArray(count).map(\n (): WorkerDescriptor<ThreadType> => ({\n init: spawnWorker(),\n runningTasks: [],\n }),\n )\n}\n\n/**\n * Thread pool managing a set of worker threads.\n * Use it to queue tasks that are run on those threads with limited\n * concurrency.\n */\nexport interface Pool<ThreadType extends Thread> {\n /**\n * Returns a promise that resolves once the task queue is emptied.\n * Promise will be rejected if any task fails.\n *\n * @param allowResolvingImmediately Set to `true` to resolve immediately if task queue is currently empty.\n */\n completed(allowResolvingImmediately?: boolean): Promise<any>\n\n /**\n * Returns a promise that resolves once the task queue is emptied.\n * Failing tasks will not cause the promise to be rejected.\n *\n * @param allowResolvingImmediately Set to `true` to resolve immediately if task queue is currently empty.\n */\n settled(allowResolvingImmediately?: boolean): Promise<Error[]>\n\n /**\n * Returns an observable that yields pool events.\n */\n events(): Observable<PoolEvent<ThreadType>>\n\n /**\n * Queue a task and return a promise that resolves once the task has been dequeued,\n * started and finished.\n *\n * @param task An async function that takes a thread instance and invokes it.\n */\n queue<Return>(task: TaskRunFunction<ThreadType, Return>): QueuedTask<ThreadType, Return>\n\n /**\n * Terminate all pool threads.\n *\n * @param force Set to `true` to kill the thread even if it cannot be stopped gracefully.\n */\n terminate(force?: boolean): Promise<void>\n}\n\ninterface PoolOptions {\n /** Maximum no. of tasks to run on one worker thread at a time. Defaults to one. */\n concurrency?: number\n\n /** Maximum no. of jobs to be queued for execution before throwing an error. */\n maxQueuedJobs?: number\n\n /** Gives that pool a name to be used for debug logging, letting you distinguish between log output of different pools. */\n name?: string\n\n /** No. of worker threads to spawn and to be managed by the pool. */\n size?: number\n}\n\nclass WorkerPool<ThreadType extends Thread> implements Pool<ThreadType> {\n static EventType = PoolEventType\n\n private readonly debug: DebugLogger.Debugger\n private readonly eventObservable: Observable<PoolEvent<ThreadType>>\n private readonly options: PoolOptions\n private readonly workers: Array<WorkerDescriptor<ThreadType>>\n\n private readonly eventSubject = new Subject<PoolEvent<ThreadType>>()\n private initErrors: Error[] = []\n private isClosing = false\n private nextTaskID = 1\n private taskQueue: Array<QueuedTask<ThreadType, any>> = []\n\n constructor(spawnWorker: () => Promise<ThreadType>, optionsOrSize?: number | PoolOptions) {\n const options: PoolOptions = typeof optionsOrSize === 'number' ? { size: optionsOrSize } : optionsOrSize || {}\n\n const { size = defaultPoolSize } = options\n\n this.debug = DebugLogger(`threads:pool:${slugify(options.name || String(nextPoolID++))}`)\n this.options = options\n this.workers = spawnWorkers(spawnWorker, size)\n\n this.eventObservable = multicast(Observable.from(this.eventSubject))\n\n Promise.all(this.workers.map(worker => worker.init)).then(\n () =>\n this.eventSubject.next({\n size: this.workers.length,\n type: PoolEventType.initialized,\n }),\n (error) => {\n this.debug('Error while initializing pool worker:', error)\n this.eventSubject.error(error)\n this.initErrors.push(error)\n },\n )\n }\n\n private findIdlingWorker(): WorkerDescriptor<ThreadType> | undefined {\n const { concurrency = 1 } = this.options\n return this.workers.find(worker => worker.runningTasks.length < concurrency)\n }\n\n private async runPoolTask(worker: WorkerDescriptor<ThreadType>, task: QueuedTask<ThreadType, any>) {\n const workerID = this.workers.indexOf(worker) + 1\n\n this.debug(`Running task #${task.id} on worker #${workerID}...`)\n this.eventSubject.next({\n taskID: task.id,\n type: PoolEventType.taskStart,\n workerID,\n })\n\n try {\n const returnValue = await task.run(await worker.init)\n\n this.debug(`Task #${task.id} completed successfully`)\n this.eventSubject.next({\n returnValue,\n taskID: task.id,\n type: PoolEventType.taskCompleted,\n workerID,\n })\n } catch (ex) {\n const error = ex as Error\n this.debug(`Task #${task.id} failed`)\n this.eventSubject.next({\n error,\n taskID: task.id,\n type: PoolEventType.taskFailed,\n workerID,\n })\n }\n }\n\n private run(worker: WorkerDescriptor<ThreadType>, task: QueuedTask<ThreadType, any>) {\n const runPromise = (async () => {\n const removeTaskFromWorkersRunningTasks = () => {\n worker.runningTasks = worker.runningTasks.filter(someRunPromise => someRunPromise !== runPromise)\n }\n\n // Defer task execution by one tick to give handlers time to subscribe\n await delay(0)\n\n try {\n await this.runPoolTask(worker, task)\n } finally {\n removeTaskFromWorkersRunningTasks()\n\n if (!this.isClosing) {\n this.scheduleWork()\n }\n }\n })()\n\n worker.runningTasks.push(runPromise)\n }\n\n private scheduleWork() {\n this.debug('Attempt de-queueing a task in order to run it...')\n\n const availableWorker = this.findIdlingWorker()\n if (!availableWorker) return\n\n const nextTask = this.taskQueue.shift()\n if (!nextTask) {\n this.debug('Task queue is empty')\n this.eventSubject.next({ type: PoolEventType.taskQueueDrained })\n return\n }\n\n this.run(availableWorker, nextTask)\n }\n\n private taskCompletion(taskID: number) {\n return new Promise<any>((resolve, reject) => {\n const eventSubscription = this.events().subscribe((event) => {\n if (event.type === PoolEventType.taskCompleted && event.taskID === taskID) {\n eventSubscription.unsubscribe()\n resolve(event.returnValue)\n } else if (event.type === PoolEventType.taskFailed && event.taskID === taskID) {\n eventSubscription.unsubscribe()\n reject(event.error)\n } else if (event.type === PoolEventType.terminated) {\n eventSubscription.unsubscribe()\n reject(new Error('Pool has been terminated before task was run.'))\n }\n })\n })\n }\n\n async settled(allowResolvingImmediately: boolean = false): Promise<Error[]> {\n const getCurrentlyRunningTasks = () => flatMap(this.workers, worker => worker.runningTasks)\n\n const taskFailures: Error[] = []\n\n const failureSubscription = this.eventObservable.subscribe((event) => {\n if (event.type === PoolEventType.taskFailed) {\n taskFailures.push(event.error)\n }\n })\n\n if (this.initErrors.length > 0) {\n throw this.initErrors[0]\n }\n if (allowResolvingImmediately && this.taskQueue.length === 0) {\n await Promise.allSettled(getCurrentlyRunningTasks())\n return taskFailures\n }\n\n await new Promise<void>((resolve, reject) => {\n const subscription = this.eventObservable.subscribe({\n error: reject,\n next(event) {\n if (event.type === PoolEventType.taskQueueDrained) {\n subscription.unsubscribe()\n resolve(void 0)\n }\n }, // make a pool-wide error reject the completed() result promise\n })\n })\n\n await Promise.allSettled(getCurrentlyRunningTasks())\n failureSubscription.unsubscribe()\n\n return taskFailures\n }\n\n async completed(allowResolvingImmediately: boolean = false) {\n const settlementPromise = this.settled(allowResolvingImmediately)\n\n const earlyExitPromise = new Promise<Error[]>((resolve, reject) => {\n const subscription = this.eventObservable.subscribe({\n error: reject,\n next(event) {\n if (event.type === PoolEventType.taskQueueDrained) {\n subscription.unsubscribe()\n resolve(settlementPromise)\n } else if (event.type === PoolEventType.taskFailed) {\n subscription.unsubscribe()\n reject(event.error)\n }\n }, // make a pool-wide error reject the completed() result promise\n })\n })\n\n const errors = await Promise.race([settlementPromise, earlyExitPromise])\n\n if (errors.length > 0) {\n throw errors[0]\n }\n }\n\n events() {\n return this.eventObservable\n }\n\n queue(taskFunction: TaskRunFunction<ThreadType, any>) {\n const { maxQueuedJobs = Number.POSITIVE_INFINITY } = this.options\n\n if (this.isClosing) {\n throw new Error('Cannot schedule pool tasks after terminate() has been called.')\n }\n if (this.initErrors.length > 0) {\n throw this.initErrors[0]\n }\n\n const taskID = this.nextTaskID++\n const taskCompletion = this.taskCompletion(taskID)\n\n taskCompletion.catch((error) => {\n // Prevent unhandled rejections here as we assume the user will use\n // `pool.completed()`, `pool.settled()` or `task.catch()` to handle errors\n this.debug(`Task #${taskID} errored:`, error)\n })\n\n const task: QueuedTask<ThreadType, any> = {\n cancel: () => {\n if (!this.taskQueue.includes(task)) return\n this.taskQueue = this.taskQueue.filter(someTask => someTask !== task)\n this.eventSubject.next({\n taskID: task.id,\n type: PoolEventType.taskCanceled,\n })\n },\n id: taskID,\n run: taskFunction,\n then: taskCompletion.then.bind(taskCompletion),\n }\n\n if (this.taskQueue.length >= maxQueuedJobs) {\n throw new Error(\n 'Maximum number of pool tasks queued. Refusing to queue another one.\\n'\n + 'This usually happens for one of two reasons: We are either at peak '\n + \"workload right now or some tasks just won't finish, thus blocking the pool.\",\n )\n }\n\n this.debug(`Queueing task #${task.id}...`)\n this.taskQueue.push(task)\n\n this.eventSubject.next({\n taskID: task.id,\n type: PoolEventType.taskQueued,\n })\n\n this.scheduleWork()\n return task\n }\n\n async terminate(force?: boolean) {\n this.isClosing = true\n if (!force) {\n await this.completed(true)\n }\n this.eventSubject.next({\n remainingQueue: [...this.taskQueue],\n type: PoolEventType.terminated,\n })\n this.eventSubject.complete()\n await Promise.all(this.workers.map(async worker => Thread.terminate(await worker.init)))\n }\n}\n\n/**\n * Thread pool constructor. Creates a new pool and spawns its worker threads.\n */\nfunction PoolConstructor<ThreadType extends Thread>(spawnWorker: () => Promise<ThreadType>, optionsOrSize?: number | PoolOptions) {\n // The function exists only so we don't need to use `new` to create a pool (we still can, though).\n // If the Pool is a class or not is an implementation detail that should not concern the user.\n return new WorkerPool(spawnWorker, optionsOrSize)\n}\n\n;(PoolConstructor as any).EventType = PoolEventType\n\n/**\n * Thread pool constructor. Creates a new pool and spawns its worker threads.\n */\nexport const Pool = PoolConstructor as typeof PoolConstructor & { EventType: typeof PoolEventType }\n\nexport type { PoolEvent, QueuedTask } from './pool-types.ts'\nexport { PoolEventType } from './pool-types.ts'\nexport { Thread } from './thread.ts'\n","/* eslint-disable @stylistic/max-len */\n/* eslint-disable import-x/no-internal-modules */\n// tslint:disable max-classes-per-file\n\nimport type { ImplementationExport, ThreadsWorkerOptions } from '../types/master.ts'\nimport { getBundleURL } from './get-bundle-url.browser.ts'\n\nexport const defaultPoolSize = typeof navigator !== 'undefined' && navigator.hardwareConcurrency ? navigator.hardwareConcurrency : 4\n\nconst isAbsoluteURL = (value: string) => /^[A-Za-z][\\d+.A-Za-z\\-]*:/.test(value)\n\nfunction createSourceBlobURL(code: string): string {\n const blob = new Blob([code], { type: 'application/javascript' })\n return URL.createObjectURL(blob)\n}\n\nfunction selectWorkerImplementation(): ImplementationExport {\n if (typeof Worker === 'undefined') {\n // Might happen on Safari, for instance\n // The idea is to only fail if the constructor is actually used\n return class NoWebWorker {\n constructor() {\n throw new Error(\n \"No web worker implementation available. You might have tried to spawn a worker within a worker in a browser that doesn't support workers in workers.\",\n )\n }\n } as unknown as ImplementationExport\n }\n\n class WebWorker extends Worker {\n constructor(url: string | URL, options?: ThreadsWorkerOptions) {\n if (typeof url === 'string' && options && options._baseURL) {\n url = new URL(url, options._baseURL)\n } else if (typeof url === 'string' && !isAbsoluteURL(url) && /^file:\\/\\//i.test(getBundleURL())) {\n url = new URL(url, getBundleURL().replace(/\\/[^/]+$/, '/'))\n if (options?.CORSWorkaround ?? true) {\n url = createSourceBlobURL(`importScripts(${JSON.stringify(url)});`)\n }\n }\n if (\n typeof url === 'string'\n && isAbsoluteURL(url) // Create source code blob loading JS file via `importScripts()`\n // to circumvent worker CORS restrictions\n && (options?.CORSWorkaround ?? true)\n ) {\n url = createSourceBlobURL(`importScripts(${JSON.stringify(url)});`)\n }\n super(url, options)\n }\n }\n\n class BlobWorker extends WebWorker {\n constructor(blob: Blob, options?: ThreadsWorkerOptions) {\n const url = globalThis.URL.createObjectURL(blob)\n super(url, options)\n }\n\n static fromText(source: string, options?: ThreadsWorkerOptions): WebWorker {\n const blob = new globalThis.Blob([source], { type: 'text/javascript' })\n return new BlobWorker(blob, options)\n }\n }\n\n return {\n blob: BlobWorker,\n default: WebWorker,\n }\n}\n\nlet implementation: ImplementationExport\n\nexport function getWorkerImplementation(): ImplementationExport {\n if (!implementation) {\n implementation = selectWorkerImplementation()\n }\n return implementation\n}\n\nexport function isWorkerRuntime() {\n const isWindowContext = typeof globalThis !== 'undefined' && typeof Window !== 'undefined' && globalThis instanceof Window\n return typeof globalThis !== 'undefined' && self['postMessage'] && !isWindowContext ? true : false\n}\n","/* eslint-disable @typescript-eslint/no-explicit-any */\n/* eslint-disable @typescript-eslint/member-ordering */\nimport type { Thread } from './thread.ts'\n\n/** Pool event type. Specifies the type of each `PoolEvent`. */\nexport enum PoolEventType {\n initialized = 'initialized',\n taskCanceled = 'taskCanceled',\n taskCompleted = 'taskCompleted',\n taskFailed = 'taskFailed',\n taskQueued = 'taskQueued',\n taskQueueDrained = 'taskQueueDrained',\n taskStart = 'taskStart',\n terminated = 'terminated',\n}\n\nexport type TaskRunFunction<ThreadType extends Thread, Return> = (worker: ThreadType) => Promise<Return>\n\n/** Pool event. Subscribe to those events using `pool.events()`. Useful for debugging. */\nexport type PoolEvent<ThreadType extends Thread> =\n | {\n type: PoolEventType.initialized\n size: number\n }\n | {\n type: PoolEventType.taskQueued\n taskID: number\n }\n | {\n type: PoolEventType.taskQueueDrained\n }\n | {\n type: PoolEventType.taskStart\n taskID: number\n workerID: number\n }\n | {\n type: PoolEventType.taskCompleted\n returnValue: any\n taskID: number\n workerID: number\n }\n | {\n type: PoolEventType.taskFailed\n error: Error\n taskID: number\n workerID: number\n }\n | {\n type: PoolEventType.taskCanceled\n taskID: number\n }\n | {\n type: PoolEventType.terminated\n remainingQueue: Array<QueuedTask<ThreadType, any>>\n }\n\nexport interface WorkerDescriptor<ThreadType extends Thread> {\n init: Promise<ThreadType>\n runningTasks: Array<Promise<any>>\n}\n\n/**\n * Task that has been `pool.queued()`-ed.\n */\nexport interface QueuedTask<ThreadType extends Thread, Return> {\n /** @private */\n id: number\n\n /** @private */\n run: TaskRunFunction<ThreadType, Return>\n\n /**\n * Queued tasks can be cancelled until the pool starts running them on a worker thread.\n */\n cancel(): void\n\n /**\n * `QueuedTask` is thenable, so you can `await` it.\n * Resolves when the task has successfully been executed. Rejects if the task fails.\n */\n then: Promise<Return>['then']\n}\n","export const $errors = Symbol('thread.errors')\nexport const $events = Symbol('thread.events')\nexport const $terminate = Symbol('thread.terminate')\nexport const $transferable = Symbol('thread.transferable')\nexport const $worker = Symbol('thread.worker')\n","/* eslint-disable import-x/no-internal-modules */\nimport type { Observable } from 'observable-fns'\n\nimport {\n $errors, $events, $terminate,\n} from '../symbols.ts'\nimport type { Thread as ThreadType, WorkerEvent } from '../types/master.ts'\n\nfunction fail(message: string): never {\n throw new Error(message)\n}\n\nexport type Thread = ThreadType\n\n/** Thread utility functions. Use them to manage or inspect a `spawn()`-ed thread. */\nexport const Thread = {\n /** Return an observable that can be used to subscribe to all errors happening in the thread. */\n errors<ThreadT extends ThreadType>(thread: ThreadT): Observable<Error> {\n return thread[$errors] || fail('Error observable not found. Make sure to pass a thread instance as returned by the spawn() promise.')\n },\n /** Return an observable that can be used to subscribe to internal events happening in the thread. Useful for debugging. */\n events<ThreadT extends ThreadType>(thread: ThreadT): Observable<WorkerEvent> {\n return thread[$events] || fail('Events observable not found. Make sure to pass a thread instance as returned by the spawn() promise.')\n },\n /** Terminate a thread. Remember to terminate every thread when you are done using it. */\n terminate<ThreadT extends ThreadType>(thread: ThreadT) {\n return thread[$terminate]()\n 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