Refactor exception handling to avoid broad exception capture and improve error specificity in `routers/code_generator.py`.

[tawada]

Certainly! After reviewing the code, here is one issue that stands out:

Issue

Faulty Exception Handling in routers/code_generator.py:

When handling exceptions in the generate_code_from_issue_and_reply and generate_readme functions, generic Exception and OSError are caught. This is problematic for a few reasons:

1. Broad Exception Capture: Catching Exception and OSError might catch exceptions that are unrelated to the intended error handling logic. This can mask other bugs and make debugging difficult.
2. Lack of Specific Error Information: By catching such broad exceptions, the code doesn't provide specific error information, making it hard to determine the root cause of an issue.

Code Example:

try:
    services.github.checkout_new_branch(repo, "update-readme")
except services.github.exceptions.GitBranchAlreadyExistsException as err:
    log(f"Error while checking out a new branch: {err}", level="error")
    raise
except FileNotFoundError as err:
    log(f"Error while checking out a new branch: {err}", level="error")
    raise
except Exception as err:  # Broad Exception Capture
    log(f"Error to checkout a new branch: {err}", level="error")
    raise

Recommendation:

1. Use Specific Exceptions: Wherever possible, catch specific exceptions. For general cases, use custom exception types that provide more context.
2. Provide Detailed Logs: Ensure that logs provide sufficient detail to understand the context of the error.

Example:

try:
    services.github.checkout_new_branch(repo, "update-readme")
except services.github.exceptions.GitBranchAlreadyExistsException as err:
    log(f"Branch 'update-readme' already exists: {err}", level="error")
    raise
except FileNotFoundError as err:
    log(f"Repository path not found when attempting to checkout 'update-readme': {err}", level="error")
    raise
# Avoiding general exception unless absolutely necessary with specific handling
except (PermissionError, IOError) as err:
    log(f"File operation error: {err}", level="error")
    raise
except Exception as err:
    log(f"Unexpected error during branch checkout: {err}", level="error")
    raise

By refining exception handling in this way, the code will be more robust, easier to debug, and provide better insights into the nature of any issues that arise.