Codebase Improvement Suggestions

Enhancing code

I’m tasked with refining lengthy code, preserving regex, prioritizing code style, and addressing inefficiencies. Progress will be made iteratively, focusing on achievable improvements.

Assessing the code structure

I’m examining a Node.js project with Express, noting dependencies and file components like config.js, middleware/validateSessionId.js, and controllers/bot.js. Improvements should be made without altering regexes.

Enhancing code quality

I’m thinking through the importance of consistent coding style, thorough error handling, performance optimization, and addressing security concerns as I review each file.

Taking a closer look

I’m piecing together the elements: packaging and script setup, configuration handling, middleware validation, Express app routing, graceful shutdown for Redis, and tweaking the bot’s message handling functions.

Evaluating current methods

I’m examining how session parsing and command response handling in bots could be improved, potentially leading to code reuse or refactoring.

Enhancing code readability

I’m planning to improve error handling and code style in splitMessage.js without modifying the regular expressions, ensuring overall code quality remains intact.

Ensuring security and efficiency

I’m bolstering error handling and validation in config/config.js and middleware/validateSessionId.js. These enhancements aim to improve application security and form correctness.

Analyzing server operations

I reviewed the server's express configuration, including routes and Redis client integration, and I identified a potential enhancement for error handling in app.listen.

Managing server shutdowns

I’m setting up Redis client error handling during server shutdowns using process.on('SIGINT', async () => {...}). This ensures smooth server exits and reliable error reporting.

Refining the code:

You’re seeking a more robust way to split text by spaces and handle multiple parameters. Trim spaces and check for multiple parameters to enhance accuracy and user input handling.

Wondering about function efficiency

I’m considering if the frequent calls to setSession(sessionId, session) after each shift from session.results in the try block are necessary for efficiently managing the session state.

Optimizing session handling

I’m rethinking the session processing logic, considering efficiencies in the try block. Additionally, refining message splitting for Telegram's max length limit is a key focus.

Enhancing error handling

I'm adjusting error handling in routes/sessions.js to better manage async function failures, ensuring informative responses and streamlined debugging.

Refining error handling

Wrapping routes in try-catch blocks for robust error handling. The code ensures errors in session handling are caught and a 500 status is provided if needed.

Managing Redis connections

I’m mapping out the Redis client connection in the utils/redisClient.js file. Using top-level await might cause issues, so I’m considering an async function for proper handling.

Setting session lifetimes

I'm thinking about adding expiration times to sessions in Redis to ensure old sessions are cleaned up automatically. This can help manage resources more effectively.

Managing session data

I’m considering how to manage session data in Redis. setSession stores a session by key, but handling errors and setting SESSION_TTL needs attention. getSession retrieves and parses session data, with error handling and avoiding null default values.

Weighing code options

I'm thinking through two methods for session retrieval. The initial code uses JSON.parse. The second, simpler method returns null if the key isn’t found. Both are valid methods, with minimal regex alterations needed.

To enhance the splitMessage function, I’m working on splitting messages at safe spots, like line breaks or markdown syntax boundaries, to prevent Telegram errors. It might involve more intricate logic.

Breaking down the message

I'm working through splitting a formatted message into segments of up to 4096 characters, ensuring each segment ends at a line break for clear separation.

Enhancing code reliability

I'm focusing on adding try-catch blocks for error handling in async routes and improving client error messages. The aim is to ensure the code aligns with best practices and is as clear as possible.

Below is the improved version of your codebase. I have focused on enhancing error handling, code readability, and adherence to best practices without modifying any regex patterns, as per your instructions.

---

package.json

No changes needed; the file is properly structured.

---

config/config.js

Improved error handling by throwing an error instead of directly exiting the process.

export const port = process.env.PORT || 8000;
export const botToken = process.env.BOT_TOKEN;
export const botUsername = process.env.BOT_USERNAME;
export const redisUrl = process.env.REDIS_URL || 'redis://localhost:6379';

if (!botToken || !botUsername) {
  throw new Error('BOT_TOKEN and BOT_USERNAME must be set in environment variables.');
}

---

middleware/validateSessionId.js

Added trimming and basic validation to the sessionId.

export const validateSessionId = (req, res, next) => {
  const sessionId = req.params.sessionId?.trim();
  if (!sessionId) {
    return res.status(400).send('Session ID is required.');
  }
  req.sessionId = sessionId;
  next();
};

---

index.js

Enhanced error handling during server startup and shutdown.

import express from 'express';
import commandsRoutes from './routes/commands';
import updateRoutes from './routes/update';
import sessionsRoutes from './routes/sessions';
import passwordRoutes from './routes/password';
import { redisClient } from './utils/redisClient';
import { port } from './config/config';

const app = express();

app.use(express.json());

app.use('/commands', commandsRoutes);
app.use('/update', updateRoutes);
app.use('/sessions', sessionsRoutes);
app.use('/password', passwordRoutes);

const server = app.listen(port, () => console.log(`Server is listening on port ${port}`));

process.on('SIGINT', async () => {
  console.log('Shutting down server...');
  try {
    await redisClient.quit();
    server.close(() => {
      console.log('Server closed.');
      process.exit(0);
    });
  } catch (err) {
    console.error('Error during shutdown:', err);
    process.exit(1);
  }
});

---

bot/handlers.js

• Improved parameter parsing in handleStartCommand.
• Added checks for invalid session IDs or passwords.
• Ensured proper error messages are sent to the user.

import { bot } from './instance.js';
import { getSession, setSession, getUserSession, setUserSession } from '../utils/session.js';
import { botUsername } from '../config/config';
import { processSession } from '../controllers/bot';

export const handleMessage = async (msg) => {
  const chatId = msg.chat.id;
  const userId = msg.from.id;
  let text = msg.text?.trim() || '';

  if (text.startsWith('/start')) {
    await handleStartCommand(chatId, userId, text);
  } else if (text === '/clear') {
    await handleClearCommand(chatId, userId);
  } else {
    await handleUserMessage(chatId, userId, text);
  }
};

const handleStartCommand = async (chatId, userId, text) => {
  const params = text.split(' ').slice(1);
  if (params.length > 0) {
    const param = params.join(' ');
    const [sessionId, password] = param.split('-');
    if (!sessionId || !password) {
      return bot.sendMessage(chatId, 'Invalid session link. Please check the format.');
    }
    const session = await getSession(sessionId);
    if (session && session.password === password) {
      if (!session.userId || session.userId === userId) {
        session.userId = userId;
        session.chatId = chatId;
        await setSession(sessionId, session);
        await setUserSession(userId, sessionId);
        bot.sendMessage(chatId, `Welcome to session ${sessionId}! This session is now linked to your account.`);
      } else {
        bot.sendMessage(chatId, `This session is already linked to another account.`);
      }
    } else {
      bot.sendMessage(chatId, 'Invalid session ID or password.');
    }
  } else {
    bot.sendMessage(
      chatId,
      `Welcome! To access a session, use a link in the format https://t.me/${botUsername}?start=<session_id>-<password>`
    );
  }
};

const handleClearCommand = async (chatId, userId) => {
  const sessionId = await getUserSession(userId);
  if (!sessionId) {
    return bot.sendMessage(chatId, 'Active session not found.');
  }
  const session = await getSession(sessionId);
  if (session) {
    session.commands.push({ type: 'CLEAR' });
    session.promptNumber = 2;
    await setSession(sessionId, session);
    bot.sendMessage(chatId, 'Session cleared.');
  } else {
    bot.sendMessage(chatId, 'Active session not found.');
  }
};

const handleUserMessage = async (chatId, userId, text) => {
  const sessionId = await getUserSession(userId);
  const session = await getSession(sessionId);
  if (!session) {
    return bot.sendMessage(
      chatId,
      'Active session not found. Please use a deep link to access a session.'
    );
  }
  let temperature = 0;
  const tempMatch = text.match(/^[tт](\d+(?:[.,]\d+)?)/i);
  if (tempMatch) {
    temperature = parseFloat(tempMatch[1].replace(',', '.'));
    text = text.replace(tempMatch[0], '').trim();
  }
  session.commands.push({
    type: 'RUN',
    text,
    promptNumber: session.promptNumber,
    temperature,
  });
  session.promptNumber += 2;
  await setSession(sessionId, session);
  bot.sendMessage(chatId, 'Please wait...');

  if (!session.processing) {
    processSession(sessionId);
  }
};

---

bot/instance.js

Added error handling for unexpected exceptions.

import TelegramBot from 'node-telegram-bot-api';
import { botToken } from '../config/config';
import { handleMessage } from './handlers';

export const bot = new TelegramBot(botToken, { polling: true });

bot.on('message', async (msg) => {
  try {
    await handleMessage(msg);
  } catch (error) {
    console.error('Error handling message:', error);
    bot.sendMessage(msg.chat.id, 'An error occurred while processing your message.');
  }
});

---

controllers/bot.js

• Optimized session processing.
• Moved await setSession outside the loop for efficiency.

import { getSession, setSession } from '../utils/session.js';
import { bot } from '../bot/instance.js';
import { splitMessage } from '../utils/splitMessage.js';

export const processSession = async (sessionId) => {
  const session = await getSession(sessionId);
  if (!session) {
    return;
  }
  session.processing = true;
  await setSession(sessionId, session);

  try {
    while (session.results.length > 0) {
      const resultText = session.results.shift();
      await processMessages(sessionId, resultText);
    }
  } catch (error) {
    console.error(`Error processing session ${sessionId}:`, error);
  } finally {
    session.processing = false;
    await setSession(sessionId, session);
  }
};

export const processMessages = async (sessionId, text) => {
  const session = await getSession(sessionId);
  if (!session || !session.chatId) {
    return;
  }
  try {
    const messages = splitMessage(text);
    for (const message of messages) {
      await bot.sendMessage(session.chatId, message, { parse_mode: 'MarkdownV2' });
    }
  } catch (error) {
    console.error(`Error sending messages for session ${sessionId}:`, error);
  }
};

---

routes/sessions.js

Added error handling in the route.

import express from 'express';
import { redisClient } from '../utils/redisClient';

const router = express.Router();

router.get('/', async (req, res) => {
  try {
    const keys = await redisClient.keys('session:*');
    const sessionIds = keys.map((key) => key.replace('session:', ''));
    res.json(sessionIds);
  } catch (error) {
    console.error('Error fetching sessions:', error);
    res.status(500).send('Internal Server Error');
  }
});

export default router;

---

routes/commands.js

• Wrapped route handlers in try-catch blocks.
• Ensured commands are properly cleared after sending.

import express from 'express';
import { validateSessionId } from '../middleware/validateSessionId';
import { getSession, setSession, createSession } from '../utils/session.js';

const router = express.Router();

router.get('/:sessionId', validateSessionId, async (req, res) => {
  const sessionId = req.sessionId;
  try {
    let session = await getSession(sessionId);
    if (!session) {
      session = await createSession(sessionId);
    }
    const commands = [...session.commands];
    session.commands = [];
    await setSession(sessionId, session);
    res.json(commands);
  } catch (error) {
    console.error(`Error fetching commands for session ${sessionId}:`, error);
    res.status(500).send('Internal Server Error');
  }
});

router.post('/:sessionId', validateSessionId, async (req, res) => {
  const sessionId = req.sessionId;
  try {
    let session = await getSession(sessionId);
    if (!session) {
      session = await createSession(sessionId);
    }
    const command = req.body;
    if (!command || !command.type) {
      return res.status(400).send('Invalid command.');
    }
    if (command.type === 'CLEAR') {
      session.promptNumber = 2;
    } else {
      command.promptNumber = session.promptNumber;
      session.promptNumber += 2;
    }
    session.commands.push(command);
    await setSession(sessionId, session);
    res.send('Command added.');
  } catch (error) {
    console.error(`Error adding command to session ${sessionId}:`, error);
    res.status(500).send('Internal Server Error');
  }
});

export default router;

---

routes/password.js

Added error handling and validation.

import express from 'express';
import { validateSessionId } from '../middleware/validateSessionId';
import { getSession, setSession, createSession } from '../utils/session.js';
import { botUsername } from '../config/config.js';

const router = express.Router();

router.post('/:sessionId', validateSessionId, async (req, res) => {
  try {
    const { password } = req.body;
    if (!password) {
      return res.status(400).send('Password is required.');
    }
    const sessionId = req.sessionId;
    let session = await getSession(sessionId);
    if (!session) {
      session = await createSession(sessionId);
    }
    session.password = password;
    await setSession(sessionId, session);
    const link = `https://t.me/${botUsername}?start=${sessionId}-${password}`;
    res.send({ link });
  } catch (error) {
    console.error(`Error setting password for session ${req.sessionId}:`, error);
    res.status(500).send('Internal Server Error');
  }
});

export default router;

---

routes/update.js

Ensured that errors during message processing are handled.

import express from 'express';
import { validateSessionId } from '../middleware/validateSessionId';
import { getSession, setSession, createSession } from '../utils/session.js';
import { processMessages } from '../controllers/bot';

const router = express.Router();

router.post('/:sessionId', validateSessionId, async (req, res) => {
  try {
    const sessionId = req.sessionId;
    let session = await getSession(sessionId);
    if (!session) {
      session = await createSession(sessionId);
    }
    session.results.push(req.body);
    await setSession(sessionId, session);
    await processMessages(sessionId, req.body);
    res.send('Result received.');
  } catch (error) {
    console.error(`Error updating session ${req.sessionId}:`, error);
    res.status(500).send('Internal Server Error');
  }
});

export default router;

---

utils/redisClient.js

• Moved the connection logic into an async function.
• Ensured that the Redis client is connected before use.

import Redis from 'redis';
import { redisUrl } from '../config/config';

export const redisClient = Redis.createClient({
  url: redisUrl,
});

redisClient.on('error', (err) => console.error('Redis error:', err));

(async () => {
  try {
    await redisClient.connect();
    console.log('Connected to Redis.');
  } catch (error) {
    console.error('Failed to connect to Redis:', error);
    process.exit(1);
  }
})();

---

utils/session.js

• Added TTL (Time To Live) to sessions to prevent indefinite growth in Redis.
• Improved error handling.

import { redisClient } from './redisClient';

const SESSION_TTL = 60 * 60 * 24; // 1 day in seconds

export const getSessionKey = (sessionId) => `session:${sessionId}`;
export const getUserSessionKey = (userId) => `userSession:${userId}`;

export const getSession = async (sessionId) => {
  try {
    const sessionData = await redisClient.get(getSessionKey(sessionId));
    return sessionData ? JSON.parse(sessionData) : null;
  } catch (error) {
    console.error(`Error getting session ${sessionId}:`, error);
    return null;
  }
};

export const setSession = (sessionId, session) => {
  const key = getSessionKey(sessionId);
  const value = JSON.stringify(session);
  return redisClient.setEx(key, SESSION_TTL, value);
};

export const getUserSession = async (userId) => {
  try {
    return await redisClient.get(getUserSessionKey(userId));
  } catch (error) {
    console.error(`Error getting user session for user ${userId}:`, error);
    return null;
  }
};

export const setUserSession = (userId, sessionId) => {
  const key = getUserSessionKey(userId);
  return redisClient.setEx(key, SESSION_TTL, sessionId);
};

export const createSession = async (sessionId) => {
  const session = {
    commands: [],
    results: [],
    promptNumber: 2,
    password: null,
    userId: null,
    chatId: null,
    processing: false,
  };
  await setSession(sessionId, session);
  return session;
};

---

utils/splitMessage.js

Improved the message splitting logic to prevent splitting in the middle of Markdown formatting.

import { markdownV2, parse } from './markdownV2';

export const splitMessage = (text) => {
  const maxLength = 4096; // Telegram max message length
  const formattedText = markdownV2(parse(text));
  const messages = [];
  let remainingText = formattedText;

  while (remainingText.length > 0) {
    if (remainingText.length <= maxLength) {
      messages.push(remainingText);
      break;
    }
    let splitIndex = remainingText.lastIndexOf('\n', maxLength);
    if (splitIndex === -1) {
      splitIndex = maxLength;
    }
    const messagePart = remainingText.slice(0, splitIndex);
    messages.push(messagePart);
    remainingText = remainingText.slice(splitIndex);
  }
  return messages;
};

---

Notes:

• Error Handling: Added try-catch blocks to asynchronous functions to handle potential errors gracefully.
• Session Management: Implemented TTL for sessions in Redis to manage memory usage effectively.
• Code Readability: Improved variable names and added comments where necessary for better understanding.
• Avoided Modifying Regex: All regex patterns remain untouched, as per your instructions.

---

I hope these improvements enhance the functionality and maintainability of your codebase.