hermes - 💡(How to fix) Fix reliability(server): add database transaction for user creation [1 participants]

TL;DR

Wrap the role verification and user insertion within a SQL transaction to ensure atomicity and prevent partial user creation.

Guidance

• Review the database documentation to determine the correct syntax for starting and committing a transaction in your SQL dialect.
• Modify the /api/users endpoint in server/src/routes/users.ts to begin a transaction before the role existence check and commit it after the INSERT query, rolling back if any errors occur.
• Consider adding error handling to catch and log any transaction rollback events for further debugging.
• Test the updated endpoint with various scenarios, including successful user creation and intentional failures during the role check or INSERT query.

Example

// server/src/routes/users.ts (simplified example)
import { pool } from '../db';

const createUser = async (user: User) => {
  const client = await pool.connect();
  try {
    await client.query('BEGIN');
    // Role existence check
    const roleResult = await client.query('SELECT * FROM roles WHERE id = $1', [user.roleId]);
    if (roleResult.rows.length === 0) {
      throw new Error('Role does not exist');
    }
    // INSERT query
    await client.query('INSERT INTO users (name, email, role_id) VALUES ($1, $2, $3)', [user.name, user.email, user.roleId]);
    await client.query('COMMIT');
  } catch (error) {
    await client.query('ROLLBACK');
    throw error;
  } finally {
    client.release();
  }
};

Notes

This approach assumes that the database system supports transactions and that the connection pool is properly configured to handle transactional queries.

Recommendation

Apply workaround: Wrap the role verification and user insertion within a SQL transaction, as this ensures data consistency without requiring significant changes to the existing codebase or database schema.