X-Git-Url: https://git.piment-noir.org/?a=blobdiff_plain;f=src%2Fworker%2FWorkerSet.ts;h=80f502c2f582d795c37211ce027586e73d29aeb7;hb=ccf11189ed15c2e4706eac4b29dee2f972c68db7;hp=a8a06a39a764fdc105f886e34ad8aab1d2075119;hpb=01f4001e733ebc61423d3023d87b1399b6afa215;p=e-mobility-charging-stations-simulator.git

diff --git a/src/worker/WorkerSet.ts b/src/worker/WorkerSet.ts
index a8a06a39..80f502c2 100644
--- a/src/worker/WorkerSet.ts
+++ b/src/worker/WorkerSet.ts
@@ -1,132 +1,232 @@
-// Partial Copyright Jerome Benoit. 2021-2023. All Rights Reserved.
+// Partial Copyright Jerome Benoit. 2021-2024. All Rights Reserved.
 
-import { Worker } from 'node:worker_threads';
+import { randomUUID } from 'node:crypto'
+import { EventEmitterAsyncResource } from 'node:events'
+import { SHARE_ENV, Worker } from 'node:worker_threads'
 
-import { WorkerAbstract } from './WorkerAbstract';
+import { WorkerAbstract } from './WorkerAbstract.js'
+import { EMPTY_FUNCTION, workerSetVersion } from './WorkerConstants.js'
 import {
-  type MessageHandler,
+  type SetInfo,
   type WorkerData,
+  type WorkerMessage,
   WorkerMessageEvents,
   type WorkerOptions,
   type WorkerSetElement,
-} from './WorkerTypes';
-import { WorkerUtils } from './WorkerUtils';
+  WorkerSetEvents
+} from './WorkerTypes.js'
+import { randomizeDelay, sleep } from './WorkerUtils.js'
 
-export class WorkerSet extends WorkerAbstract<WorkerData> {
-  private readonly workerSet: Set<WorkerSetElement>;
+interface ResponseWrapper<R extends WorkerData> {
+  resolve: (value: R | PromiseLike<R>) => void
+  reject: (reason?: unknown) => void
+  workerSetElement: WorkerSetElement
+}
+
+export class WorkerSet<D extends WorkerData, R extends WorkerData> extends WorkerAbstract<D, R> {
+  public readonly emitter: EventEmitterAsyncResource | undefined
+  private readonly workerSet: Set<WorkerSetElement>
+  private readonly promiseResponseMap: Map<
+    `${string}-${string}-${string}-${string}`,
+  ResponseWrapper<R>
+  >
+
+  private started: boolean
+  private workerStartup: boolean
 
   /**
-   * Create a new `WorkerSet`.
+   * Creates a new `WorkerSet`.
    *
    * @param workerScript -
    * @param workerOptions -
    */
-  constructor(workerScript: string, workerOptions?: WorkerOptions) {
-    super(workerScript, workerOptions);
-    this.workerSet = new Set<WorkerSetElement>();
+  constructor (workerScript: string, workerOptions: WorkerOptions) {
+    super(workerScript, workerOptions)
+    if (this.workerOptions.elementsPerWorker == null) {
+      throw new TypeError('Elements per worker is not defined')
+    }
+    if (!Number.isSafeInteger(this.workerOptions.elementsPerWorker)) {
+      throw new TypeError('Elements per worker must be an integer')
+    }
+    if (this.workerOptions.elementsPerWorker <= 0) {
+      throw new RangeError('Elements per worker must be greater than zero')
+    }
+    this.workerSet = new Set<WorkerSetElement>()
+    this.promiseResponseMap = new Map<
+      `${string}-${string}-${string}-${string}`,
+    ResponseWrapper<R>
+    >()
+    if (this.workerOptions.poolOptions?.enableEvents === true) {
+      this.emitter = new EventEmitterAsyncResource({ name: 'workerset' })
+    }
+    this.started = false
+    this.workerStartup = false
   }
 
-  get size(): number {
-    return this.workerSet.size;
+  get info (): SetInfo {
+    return {
+      version: workerSetVersion,
+      type: 'set',
+      worker: 'thread',
+      started: this.started,
+      size: this.size,
+      elementsExecuting: [...this.workerSet].reduce(
+        (accumulator, workerSetElement) => accumulator + workerSetElement.numberOfWorkerElements,
+        0
+      ),
+      // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+      elementsPerWorker: this.maxElementsPerWorker!
+    }
   }
 
-  get maxElementsPerWorker(): number | undefined {
-    return this.workerOptions.elementsPerWorker;
+  get size (): number {
+    return this.workerSet.size
   }
 
-  /**
-   *
-   * @param elementData -
-   * @returns
-   * @public
-   */
-  public async addElement(elementData: WorkerData): Promise<void> {
-    if (!this.workerSet) {
-      throw new Error("Cannot add a WorkerSet element: workers' set does not exist");
-    }
-    if (
-      this.workerSet.size === 0 ||
-      this.getLastWorkerSetElement().numberOfWorkerElements >= this.workerOptions.elementsPerWorker
-    ) {
-      await this.startWorker();
-    }
-    this.getLastWorker().postMessage({
-      id: WorkerMessageEvents.START_WORKER_ELEMENT,
-      data: elementData,
-    });
-    this.getLastWorkerSetElement().numberOfWorkerElements++;
-    // Start element sequentially to optimize memory at startup
-    if (this.workerOptions.elementStartDelay > 0) {
-      await WorkerUtils.sleep(this.workerOptions.elementStartDelay);
-    }
+  get maxElementsPerWorker (): number | undefined {
+    return this.workerOptions.elementsPerWorker
   }
 
-  /**
-   *
-   * @returns
-   * @public
-   */
-  public async start(): Promise<void> {
-    await this.startWorker();
+  /** @inheritDoc */
+  public async start (): Promise<void> {
+    this.addWorkerSetElement()
+    // Add worker set element sequentially to optimize memory at startup
+    // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+    this.workerOptions.workerStartDelay! > 0 &&
+      // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+      (await sleep(randomizeDelay(this.workerOptions.workerStartDelay!)))
+    this.emitter?.emit(WorkerSetEvents.started, this.info)
+    this.started = true
   }
 
-  /**
-   *
-   * @returns
-   * @public
-   */
-  public async stop(): Promise<void> {
+  /** @inheritDoc */
+  public async stop (): Promise<void> {
     for (const workerSetElement of this.workerSet) {
-      await workerSetElement.worker.terminate();
+      const worker = workerSetElement.worker
+      const waitWorkerExit = new Promise<void>(resolve => {
+        worker.once('exit', () => {
+          resolve()
+        })
+      })
+      worker.unref()
+      await worker.terminate()
+      await waitWorkerExit
+    }
+    this.emitter?.emit(WorkerSetEvents.stopped, this.info)
+    this.started = false
+    this.emitter?.emitDestroy()
+  }
+
+  /** @inheritDoc */
+  public async addElement (elementData: D): Promise<R> {
+    if (!this.started) {
+      throw new Error('Cannot add a WorkerSet element: not started')
     }
-    this.workerSet.clear();
+    const workerSetElement = await this.getWorkerSetElement()
+    const sendMessageToWorker = new Promise<R>((resolve, reject) => {
+      const message = {
+        uuid: randomUUID(),
+        event: WorkerMessageEvents.addWorkerElement,
+        data: elementData
+      } satisfies WorkerMessage<D>
+      workerSetElement.worker.postMessage(message)
+      this.promiseResponseMap.set(message.uuid, { resolve, reject, workerSetElement })
+    })
+    const response = await sendMessageToWorker
+    // Add element sequentially to optimize memory at startup
+    // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+    if (this.workerOptions.elementAddDelay! > 0) {
+      // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+      await sleep(randomizeDelay(this.workerOptions.elementAddDelay!))
+    }
+    return response
   }
 
   /**
-   * Start a new `Worker`.
+   * Adds a new `WorkerSetElement`.
    */
-  private async startWorker(): Promise<void> {
-    const worker = new Worker(this.workerScript);
-    worker.on(
-      'message',
-      (
-        this.workerOptions?.messageHandler ??
-        (() => {
-          /* This is intentional */
-        })
-      ).bind(this) as MessageHandler<Worker>
-    );
-    worker.on('error', WorkerUtils.defaultErrorHandler.bind(this) as (err: Error) => void);
-    worker.on('exit', (code) => {
-      WorkerUtils.defaultExitHandler(code);
-      this.workerSet.delete(this.getWorkerSetElementByWorker(worker));
-    });
-    this.workerSet.add({ worker, numberOfWorkerElements: 0 });
-    // Start worker sequentially to optimize memory at startup
-    this.workerOptions.workerStartDelay > 0 &&
-      (await WorkerUtils.sleep(this.workerOptions.workerStartDelay));
+  private addWorkerSetElement (): WorkerSetElement {
+    this.workerStartup = true
+    const worker = new Worker(this.workerScript, {
+      env: SHARE_ENV,
+      ...this.workerOptions.poolOptions?.workerOptions
+    })
+    worker.on('message', this.workerOptions.poolOptions?.messageHandler ?? EMPTY_FUNCTION)
+    worker.on('message', (message: WorkerMessage<R>) => {
+      const { uuid, event, data } = message
+      if (this.promiseResponseMap.has(uuid)) {
+        // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+        const { resolve, reject, workerSetElement } = this.promiseResponseMap.get(uuid)!
+        if (event === WorkerMessageEvents.addedWorkerElement) {
+          this.emitter?.emit(WorkerSetEvents.elementAdded, this.info)
+          workerSetElement.numberOfWorkerElements++
+          resolve(data)
+        } else if (event === WorkerMessageEvents.workerElementError) {
+          this.emitter?.emit(WorkerSetEvents.elementError, data)
+          reject(data)
+        }
+        this.promiseResponseMap.delete(uuid)
+      }
+    })
+    worker.on('error', this.workerOptions.poolOptions?.errorHandler ?? EMPTY_FUNCTION)
+    worker.on('error', error => {
+      this.emitter?.emit(WorkerSetEvents.error, error)
+      if (
+        this.workerOptions.poolOptions?.restartWorkerOnError === true &&
+        this.started &&
+        !this.workerStartup
+      ) {
+        this.addWorkerSetElement()
+      }
+      worker.unref()
+      worker.terminate().catch((error: unknown) => this.emitter?.emit(WorkerSetEvents.error, error))
+    })
+    worker.on('online', this.workerOptions.poolOptions?.onlineHandler ?? EMPTY_FUNCTION)
+    worker.on('exit', this.workerOptions.poolOptions?.exitHandler ?? EMPTY_FUNCTION)
+    worker.once('exit', () => {
+      this.removeWorkerSetElement(this.getWorkerSetElementByWorker(worker))
+    })
+    const workerSetElement: WorkerSetElement = { worker, numberOfWorkerElements: 0 }
+    this.workerSet.add(workerSetElement)
+    this.workerStartup = false
+    return workerSetElement
   }
 
-  private getLastWorkerSetElement(): WorkerSetElement {
-    let workerSetElement: WorkerSetElement;
-    for (workerSetElement of this.workerSet) {
-      /* This is intentional */
+  private removeWorkerSetElement (workerSetElement: WorkerSetElement | undefined): void {
+    if (workerSetElement == null) {
+      return
     }
-    return workerSetElement;
+    this.workerSet.delete(workerSetElement)
   }
 
-  private getLastWorker(): Worker {
-    return this.getLastWorkerSetElement().worker;
+  private async getWorkerSetElement (): Promise<WorkerSetElement> {
+    let chosenWorkerSetElement: WorkerSetElement | undefined
+    for (const workerSetElement of this.workerSet) {
+      // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+      if (workerSetElement.numberOfWorkerElements < this.workerOptions.elementsPerWorker!) {
+        chosenWorkerSetElement = workerSetElement
+        break
+      }
+    }
+    if (chosenWorkerSetElement == null) {
+      chosenWorkerSetElement = this.addWorkerSetElement()
+      // Add worker set element sequentially to optimize memory at startup
+      // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+      this.workerOptions.workerStartDelay! > 0 &&
+        // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+        (await sleep(randomizeDelay(this.workerOptions.workerStartDelay!)))
+    }
+    return chosenWorkerSetElement
   }
 
-  private getWorkerSetElementByWorker(worker: Worker): WorkerSetElement {
-    let workerSetElt: WorkerSetElement;
+  private getWorkerSetElementByWorker (worker: Worker): WorkerSetElement | undefined {
+    let workerSetElt: WorkerSetElement | undefined
     for (const workerSetElement of this.workerSet) {
       if (workerSetElement.worker.threadId === worker.threadId) {
-        workerSetElt = workerSetElement;
-        break;
+        workerSetElt = workerSetElement
+        break
       }
     }
-    return workerSetElt;
+    return workerSetElt
   }
 }