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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,3 @@ | ||
| export { PromiseAgent } from "./promise-agent"; | ||
| export { WorkerAgent } from "./worker-agent"; | ||
|
|
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,115 @@ | ||
| import { createId as generateOperationId } from "@paralleldrive/cuid2"; | ||
| import { Worker, WorkerOptions } from "node:worker_threads"; | ||
| import { | ||
| MessageFromWorker, | ||
| MessageToWorker, | ||
| WorkerData, | ||
| workerModuleId | ||
| } from "./protocol"; | ||
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|
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| type PromiseResolver<T> = (value: T) => void; | ||
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| type PromiseRejector = (err: Error) => void; | ||
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| export class PromiseAgent<TInput, TOutput> { | ||
| private readonly worker: Worker; | ||
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| private readonly operationPromiseHandlesByCorrelationId = new Map< | ||
| string, | ||
| [PromiseResolver<TOutput>, PromiseRejector] | ||
| >(); | ||
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| private workerError?: Error; | ||
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| constructor(operationModuleId: string, logToConsole = false) { | ||
| const workerData: WorkerData = { | ||
| operationModuleId, | ||
| logToConsole | ||
| }; | ||
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| const workerOptions: WorkerOptions = { | ||
| workerData | ||
| }; | ||
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| this.worker = new Worker(workerModuleId, workerOptions) | ||
| .on("message", this.handleWorkerMessage.bind(this)) | ||
| .on("error", this.handleWorkerError.bind(this)) | ||
| .on("messageerror", this.handleWorkerError.bind(this)); | ||
| } | ||
|
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| private handleWorkerMessage(message: MessageFromWorker): void { | ||
| const correlationId = message.correlationId; | ||
| if (!correlationId) { | ||
| throw new Error("The message has no correlation id!"); | ||
| } | ||
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|
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| const promiseHandles = | ||
| this.operationPromiseHandlesByCorrelationId.get(correlationId); | ||
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| if (!promiseHandles) { | ||
| throw new Error(`Unknown correlation id: '${message.correlationId}'`); | ||
| } | ||
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| this.operationPromiseHandlesByCorrelationId.delete(correlationId); | ||
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| const [resolve, reject] = promiseHandles; | ||
|
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| switch (message.type) { | ||
| case "operationOutput": | ||
| resolve(message.value as TOutput); | ||
| return; | ||
|
|
||
| case "error": | ||
| reject(new Error(message.formattedError)); | ||
| return; | ||
| } | ||
| } | ||
|
|
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| private handleWorkerError(err: Error): void { | ||
| this.workerError = err; | ||
|
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||
| for (const [ | ||
| , | ||
| reject | ||
| ] of this.operationPromiseHandlesByCorrelationId.values()) { | ||
| reject(err); | ||
| } | ||
|
|
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| this.operationPromiseHandlesByCorrelationId.clear(); | ||
| } | ||
|
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| runOperation(input: TInput): Promise<TOutput> { | ||
| if (this.workerError) { | ||
| return Promise.reject(this.workerError); | ||
| } | ||
|
|
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| return new Promise<TOutput>((resolve, reject) => { | ||
| const correlationId = generateOperationId(); | ||
|
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| this.operationPromiseHandlesByCorrelationId.set(correlationId, [ | ||
| resolve, | ||
| reject | ||
| ]); | ||
|
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| const message: MessageToWorker = { | ||
| type: "operationInput", | ||
| correlationId, | ||
| value: input | ||
| }; | ||
| this.worker.postMessage(message); | ||
| }); | ||
| } | ||
|
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| requestExit(): Promise<number> { | ||
| if (this.workerError) { | ||
| return Promise.resolve(1); | ||
| } | ||
|
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| return new Promise<number>(resolve => { | ||
| this.worker.on("exit", resolve); | ||
|
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| const message: MessageToWorker = { type: "end" }; | ||
| this.worker.postMessage(message); | ||
| }); | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,29 @@ | ||
| import { join } from "node:path"; | ||
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| export const workerModuleId = join(__dirname, "worker"); | ||
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| export type WorkerData = { | ||
| operationModuleId: string; | ||
| logToConsole: boolean; | ||
| }; | ||
|
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| export type MessageToWorker = | ||
| | { | ||
| type: "operationInput"; | ||
| correlationId?: string; | ||
| value: unknown; | ||
| } | ||
| | { | ||
| type: "end"; | ||
| }; | ||
|
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| export type MessageFromWorker = { correlationId?: string } & ( | ||
| | { | ||
| type: "operationOutput"; | ||
| value: unknown; | ||
| } | ||
| | { | ||
| type: "error"; | ||
| formattedError: string; | ||
| } | ||
| ); |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,104 @@ | ||
| import { Worker, WorkerOptions } from "node:worker_threads"; | ||
| import { | ||
| MessageFromWorker, | ||
| MessageToWorker, | ||
| WorkerData, | ||
| workerModuleId | ||
| } from "./protocol"; | ||
|
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| type GenericCallback = (...args: any[]) => void; | ||
|
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| type WorkerEventSubscriptionMethod = ( | ||
| workerEvent: string, | ||
| callback: GenericCallback | ||
| ) => void; | ||
|
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| export class WorkerAgent<TInput, TOutput> { | ||
| private readonly worker: Worker; | ||
|
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| constructor(operationModuleId: string, logToConsole = false) { | ||
| const workerData: WorkerData = { | ||
| operationModuleId, | ||
| logToConsole | ||
| }; | ||
|
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| const workerOptions: WorkerOptions = { | ||
| workerData | ||
| }; | ||
|
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| this.worker = new Worker(workerModuleId, workerOptions); | ||
| } | ||
|
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| runOperation(input: TInput): void { | ||
| const message: MessageToWorker = { | ||
| type: "operationInput", | ||
| value: input | ||
| }; | ||
| this.worker.postMessage(message); | ||
| } | ||
|
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| requestExit(): void { | ||
| const message: MessageToWorker = { type: "end" }; | ||
| this.worker.postMessage(message); | ||
| } | ||
|
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| on( | ||
| event: "result", | ||
| callback: (err: Error | null, output: TOutput | null) => void | ||
| ): this; | ||
| on(event: "error", callback: (error: Error) => void): this; | ||
| on(event: "exit", callback: (exitCode: number) => void): this; | ||
|
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| on(event: string, callback: GenericCallback): this { | ||
| return this.registerEventListener(this.worker.on, event, callback); | ||
| } | ||
|
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| once( | ||
| event: "result", | ||
| callback: (err: Error | null, output: TOutput | null) => void | ||
| ): this; | ||
| once(event: "error", callback: (error: Error) => void): this; | ||
| once(event: "exit", callback: (exitCode: number) => void): this; | ||
|
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| once(event: string, callback: GenericCallback): this { | ||
| return this.registerEventListener(this.worker.once, event, callback); | ||
| } | ||
|
|
||
| private registerEventListener( | ||
| workerEventSubscriptionMethod: WorkerEventSubscriptionMethod, | ||
| agentEvent: string, | ||
| callback: GenericCallback | ||
| ): this { | ||
| switch (agentEvent) { | ||
| case "result": | ||
| this.registerResultListener(workerEventSubscriptionMethod, callback); | ||
| break; | ||
|
|
||
| case "exit": | ||
| case "error": | ||
| workerEventSubscriptionMethod.call(this.worker, agentEvent, callback); | ||
| break; | ||
| } | ||
|
|
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| return this; | ||
| } | ||
|
|
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| private registerResultListener( | ||
| workerSubscriptionMethod: WorkerEventSubscriptionMethod, | ||
| callback: GenericCallback | ||
| ): void { | ||
| workerSubscriptionMethod.call( | ||
| this.worker, | ||
| "message", | ||
| (message: MessageFromWorker) => { | ||
| switch (message.type) { | ||
| case "operationOutput": | ||
| return callback(null, message.value); | ||
|
|
||
| case "error": | ||
| return callback(new Error(message.formattedError), null); | ||
| } | ||
| } | ||
| ); | ||
| } | ||
| } |
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