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A decorator function that wraps another function to provide database transaction management capabilities, currently implemented as a placeholder for future transaction handling.

Purpose

This decorator is designed to wrap functions that perform database operations, ensuring they execute within a transaction context. When fully implemented, it will start a transaction before executing the wrapped function, commit on success, and rollback on failure. Currently, it serves as a structural placeholder that logs errors and re-raises exceptions while maintaining the wrapped function's metadata.

Source Code

def transaction(func):
    """
    Decorator to wrap function in database transaction.
    This is a placeholder for future implementation.
    """
    @wraps(func)
    def wrapper(*args, **kwargs):
        # Future: Start transaction
        try:
            result = func(*args, **kwargs)
            # Future: Commit transaction
            return result
        except Exception as e:
            # Future: Rollback transaction
            logger.error(f"Transaction error in {func.__name__}: {e}")
            raise
    return wrapper

Parameters

Parameter Details

func: The function to be wrapped with transaction management. This should be a callable that performs database operations. The decorator preserves the original function's signature and metadata using functools.wraps.

Return Value

Returns a wrapper function that has the same signature as the input function. When called, the wrapper executes the original function and returns its result. If an exception occurs, it logs the error with the function name and re-raises the exception. The return type matches whatever the wrapped function returns.

Dependencies

• logging
• functools

Required Imports

import logging
from functools import wraps

Usage Example

import logging
from functools import wraps

logger = logging.getLogger(__name__)

def transaction(func):
    @wraps(func)
    def wrapper(*args, **kwargs):
        try:
            result = func(*args, **kwargs)
            return result
        except Exception as e:
            logger.error(f"Transaction error in {func.__name__}: {e}")
            raise
    return wrapper

@transaction
def update_user_record(user_id, name):
    # Simulated database operation
    print(f"Updating user {user_id} with name {name}")
    return {"user_id": user_id, "name": name}

# Usage
try:
    result = update_user_record(123, "John Doe")
    print(f"Success: {result}")
except Exception as e:
    print(f"Failed: {e}")

Best Practices

• Ensure a logger instance is properly configured before using this decorator
• This is a placeholder implementation - do not rely on actual transaction management until fully implemented
• The decorator preserves the original function's metadata using @wraps, making it suitable for debugging and introspection
• Always handle exceptions appropriately in the calling code, as this decorator re-raises all exceptions after logging
• When implementing the full version, ensure proper database connection management and transaction isolation levels
• Consider adding transaction timeout parameters and nested transaction support in future implementations
• The decorator can be applied to any function, but is intended for database operation functions

Tags

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