Bug Fixes: Error Handling and Stability Improvements #108

[chojuninengu]

This PR addresses issue #108 by improving the application's error handling and session state management with the following changes:

Error Handling Improvements

• Added specific error types (ValidationError, ProcessingError, QueryEngineError, SessionError)
• Implemented retry mechanism for API calls with configurable retries and delay
• Enhanced error messages with more context and better user feedback
• Added proper cleanup procedures in error cases
• Improved logging with timestamps and log levels

Session State Management

• Created dedicated session state initialization function
• Added proper cleanup procedures for resources
• Improved state variable organization
• Added context management for better data handling

Code Organization

• Separated concerns into dedicated functions
• Added proper docstrings and type hints
• Improved function signatures
• Better error handling patterns

These changes make the application more robust, easier to maintain, and provide better feedback to users when errors occur.

Closes #108

Summary by CodeRabbit

• New Features

  • Improved error messages with more specific feedback for different error types.
  • Added automatic retry for certain operations to increase reliability.
  • Enhanced session management with better cleanup and reset capabilities.

• Refactor

  • Streamlined and modularized the user interface for easier navigation and clearer workflows.
  • Improved logging with timestamps and log levels for better user support and troubleshooting.

• Bug Fixes

  • Resolved issues with session cleanup and error handling during repository loading and chat interactions.

[coderabbitai[bot]]

Walkthrough

The code refactors the Streamlit application in github-rag/app.py by introducing structured exception classes for different error categories, replacing generic exceptions. It adds a retry decorator to handle transient failures and modularizes the application logic into dedicated functions for session state initialization, repository loading, and chat message handling. Session cleanup is centralized in a new function that manages cached files and memory. Error handling is enhanced with specific exceptions, user-friendly messages, and detailed logging. The main application flow is restructured for clarity, and logging is improved with timestamps and log levels.

Changes

File(s)	Change Summary
github-rag/app.py	Refactored to introduce custom exception classes for validation, processing, query engine, and session errors; added a retry decorator for retrying operations; modularized logic into functions for session state, repository loading, and chat handling; centralized session cleanup; improved error handling and logging; restructured main Streamlit app flow.

Sequence Diagram(s)

sequenceDiagram
    participant User
    participant StreamlitApp
    participant RepoProcessor
    participant QueryEngine

    User->>StreamlitApp: Enter GitHub URL & click Load
    StreamlitApp->>RepoProcessor: validate_github_url(url)
    RepoProcessor-->>StreamlitApp: ValidationError? (if invalid)
    StreamlitApp->>RepoProcessor: process_with_gitingets(url) (with retry)
    RepoProcessor-->>StreamlitApp: ProcessingError? (on failure)
    RepoProcessor->>QueryEngine: create_query_engine(content_path, repo_name)
    QueryEngine-->>StreamlitApp: QueryEngineError? (on failure)
    StreamlitApp->>SessionState: Update with repo & engine

    User->>StreamlitApp: Enter chat prompt
    StreamlitApp->>QueryEngine: Query with prompt
    QueryEngine-->>StreamlitApp: Return response
    StreamlitApp->>SessionState: Append chat history

    User->>StreamlitApp: Click Reset
    StreamlitApp->>SessionState: cleanup_session()

Assessment against linked issues

Objective	Addressed	Explanation
Standardize error handling, improve error messages, add recovery mechanisms (#108)	✅
Implement retry mechanisms and standardize error handling for API/integration (#108)	✅
Implement proper session cleanup, resource management, and standardize session state (#108)	✅
Address Unsloth/model loading warnings and memory management (#108)	❌	No changes related to Unsloth or model loading in this PR.

Possibly related PRs

• patchy631/ai-engineering-hub#109: Extends and modularizes error handling and session management, introducing similar exception subclasses, retry logic, and Streamlit app refactoring.

Suggested reviewers

• patchy631

Poem

In the garden of code, I hop with delight,
Structured errors now guide us through night.
With retries and logs, the bugs take their flight,
Sessions are tidy, the logic is bright.
Modular bunnies, we leap without fright—
This patch brings stability, all feels just right!
🐇✨

✨ Finishing Touches

• [ ] 📝 Generate Docstrings

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