errors.py

## this file is for global error handling
import logging
from flask import jsonify
from werkzeug.exceptions import HTTPException

logger = logging.getLogger(__name__)


class BadRequestError(Exception):
    """error 400 - uncorrect request"""

class NotFoundError(Exception):
    """404 - not found"""

class ConflictError(Exception):
    """409 - Data conflict"""

class DatabaseError(Exception):
    """500 - DataBase error"""

def register_error_handlers(app):

    @app.errorhandler(BadRequestError)
    def handle_bad_request(e):
        logger.warning("400 BadRequest: %s", e)
        return jsonify({'error': str(e)}), 400

    @app.errorhandler(NotFoundError)
    def handle_not_found(e):
        logger.warning("404 NotFound: %s", e)
        return jsonify({'error': str(e)}), 404

    @app.errorhandler(ConflictError)
    def handle_conflict(e):
        logger.warning("409 Conflict: %s", e)
        return jsonify({'error': str(e)}), 409

    @app.errorhandler(DatabaseError)
    def handle_db_error(e):
        logger.error("500 DatabaseError: %s", e, exc_info=True)
        return jsonify({'error': 'DB error'}), 500

   


    @app.errorhandler(HTTPException)
    def handle_http_exception(e: HTTPException):
        logger.warning("%s %s", e.code, e.description)
        return jsonify({'error': e.description}), e.code

    # every error that we didnt handle - consider as 500 error
    @app.errorhandler(Exception)
    def handle_unexpected(e):
        logger.error("500 Unexpected: %s", e, exc_info=True)
        return jsonify({'error': 'Internal server error'}), 500