improved durability

[JacobZwang]

No description provided.

[mesa-dot-dev]

Mesa Description

TL;DR

Significantly enhanced application durability and reliability, especially for chat streams, through comprehensive refactoring, new resilience patterns, and improved error handling.

Why we made these changes

To prevent chat stream interruptions, improve user experience during network issues, provide better error feedback, and ensure overall system stability and observability.

What changed?

• Core Architecture: Refactored /api/chat to delegate to a new ChatService that orchestrates chat flow with integrated resilience, error handling, and monitoring.
• Resilience & Observability:
  • Added new Resilience class for retry and circuit breaker patterns.
  • Introduced ErrorHandler for centralized API error handling and Monitoring for tracking performance and health.
  • Added /api/health endpoint for application health status and metrics.
• Stream Management: Enhanced StreamManager with health monitoring, concurrency control (connection pooling), and improved error handling for robust streaming.
• Client-Side Durability: Implemented useStreamRecovery hook and enhanced useChatSafe for automated stream recovery, improved error display, and reload functionality in the Chat UI component.
• Library Cleanup: Streamlined src/lib/index.ts exports, re-categorized legacy components, and removed the outdated src/lib/README.md.

Validation

• Chat streams remain stable under varying network conditions.
• Stream recovery mechanisms (retry, reload) function correctly on client-side.
• Error messages are user-friendly and consistent.
• /api/health accurately reports system status and metrics.
• Circuit breaker and retry patterns protect backend services as expected.

[mesa-dot-dev]

Performed full review of 4d4c9ef...dc47b0b

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