서버에서 나는 Exception을 텔레그램 봇으로 알림을 받아보자

CatchApiServerExceptionWithTelegramBot.js

import express from 'express';
import fetch from 'node-fetch';

const app = express();

app.get('/error/:number', (request, response) => {
  try {
    const result = occurError(request.params.number);
    response.json(result);
  } catch (error) {
    errorHandler(request, response, error);
  }
});

app.listen(3000, () => {
  console.log('Web Server Listen 3000 port..!');
});

class HttpError extends Error {
  constructor(status, code, message) {
    super();
    this.status = status || 500;
    this.code = code || 'UNEXPECTED_ERROR';
    this.message = message || 'What the Unexpected Error?!?!';
  }
}

function occurError(numberParameter) {
  if (!parseInt(numberParameter, 10)) {
    throw new HttpError(403, 'PARAMETER_TYPE_EXCEPTION', 'numberParameter is require Number');
  }
  return 'This is Good Statement';
};

const TOKEN = '11111:TelegramBotToken'; // your Bot TOKEN
const TELEGRAM_BOT_URL = `https://api.telegram.org/bot${TOKEN}/sendMessage`;
const CHAT_ID = 123456789; // your chat ID

function errorHandler(request, response, error) {
  const status = error.status || 500;
  const code = error.code || 'UNEXPECTED_ERROR';
  const message = error.message || error.toString();

  if ([500, 403, 401].indexOf(status) >= 0) {
    const text = `Occur ${code} Error..!\n\n- IP: ${request.ip}\n- URI: ${request.method} ${request.originalUrl}\n- HEADERS: ${JSON.stringify(request.headers)}\n- BODY: ${JSON.stringify(request.body)}\n\n- STATUS: ${status}\n- CODE: ${code}\n- STACK: ${error.stack}`;
    fetch(TELEGRAM_BOT_URL, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        chat_id: CHAT_ID,
        text
      }),
    }).then(result => result.json())
    .catch(telegramError => console.error(telegramError));
  }

  response.status(status).send({ code, message });
}