Node Process Decorator

Install

 npm i -S node-decorator-child-process

Usage

• Import

import { RunInNewProcess } from "node-decorator-child-process";

• Usage

import { Controller, Get } from '@nestjs/common';
import { RunInNewProcess } from 'node-decorator-child-process';

@Controller()
export class HealthController {
  /**
   * Blocks the main thread for a specified duration in milliseconds.
   * This function runs in a new process due to the decorator `@RunInNewProcess`.
   *
   * @param {number} milliseconds - The time to block the thread in milliseconds.
   */
  @RunInNewProcess()
  blockMainThread(milliseconds: number) {
    const start = Date.now();
    while (Date.now() - start < milliseconds) {
      // Looping until time has passed
    }
    console.log("Finished new process", process.pid);
  }

  /**
   * Endpoint that returns health information of the service.
   * It will block the main thread for 10 seconds to simulate a heavy operation.
   *
   * @returns {Promise<string>} - A promise that resolves when the health check is completed.
   */
  @Get(['/health', '/'])
  async getHealth(): Promise<string> {
    console.log("Started process", process.pid);
    this.blockMainThread(10000); // Simulating blocking the thread for 10 seconds
    console.log("Health check completed");
    return "APP UP!"
  }
}

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License

It is available under the MIT license. License