kowalski/logger.js

const fs = require('fs');
const util = require('util');

const logFile = 'log.txt';
const logStream = fs.createWriteStream(logFile, { flags: 'a' });

const getFormattedDate = () => {
  const date = new Date();
  const year = date.getFullYear();
  const month = ('0' + (date.getMonth() + 1)).slice(-2);
  const day = ('0' + date.getDate()).slice(-2);
  const hours = ('0' + date.getHours()).slice(-2);
  const minutes = ('0' + date.getMinutes()).slice(-2);
  const seconds = ('0' + date.getSeconds()).slice(-2);
  return `[${year}-${month}-${day} ${hours}:${minutes}:${seconds}]`;
};

const logMessage = async (message) => {
  const timestamp = getFormattedDate();
  const formattedMessage = `${timestamp} ${util.format(message)}`;
  
  process.stdout.write(formattedMessage + '\n');
  
  return new Promise((resolve, reject) => {
    logStream.write(formattedMessage + '\n', (err) => {
      if (err) {
        reject(err);
      } else {
        resolve();
      }
    });
  });
};

console.log = (message) => {
  logMessage(message).catch(err => {
    process.stderr.write(`WARN: Error writing to log: ${err}\n`);
  });
};

module.exports = logMessage;