feat: randomize startup delays

[e-mobility-charging-stations-simulator.git] / src / worker / WorkerUtils.ts

import { webcrypto } from 'node:crypto';

import chalk from 'chalk';

export const sleep = async (milliSeconds: number): Promise<NodeJS.Timeout> => {
  return new Promise<NodeJS.Timeout>((resolve) => setTimeout(resolve as () => void, milliSeconds));
};

export const defaultExitHandler = (code: number): void => {
  if (code === 0) {
    console.info(chalk.green('Worker exited successfully'));
  } else if (code === 1) {
    console.info(chalk.green('Worker terminated successfully'));
  } else if (code > 1) {
    console.error(chalk.red(`Worker exited with exit code: ${code.toString()}`));
  }
};

export const defaultErrorHandler = (error: Error): void => {
  console.error(chalk.red('Worker errored: '), error);
};

export const randomizeDelay = (delay: number): number => {
  const random = secureRandom();
  const sign = random < 0.5 ? -1 : 1;
  const randomSum = delay * 0.2 * random; // 0-20% of the delay
  return delay + sign * randomSum;
};

/**
 * Generates a cryptographically secure random number in the [0,1[ range
 *
 * @returns A number in the [0,1[ range
 * @internal
 */
const secureRandom = (): number => {
  return webcrypto.getRandomValues(new Uint32Array(1))[0] / 0x100000000;
};