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Error Handling Implementation

This document describes the comprehensive error handling system implemented for the Muse AI Generated Art Marketplace to address issue #10.

Overview

The error handling system provides user-friendly error messages for API calls and wallet operations, ensuring users receive clear, actionable feedback when errors occur.

Backend Error Handling

Enhanced Error Middleware (apps/backend/src/middleware/errorHandler.ts)

New Features:

  • Error codes for categorization
  • User-friendly messages
  • Error details for debugging
  • Predefined error types

Error Types:

  • VALIDATION_ERROR - Input validation failures
  • NOT_FOUND - Resource not found
  • UNAUTHORIZED - Authentication required
  • FORBIDDEN - Permission denied
  • RATE_LIMIT_EXCEEDED - Too many requests
  • DATABASE_ERROR - Database operation failures
  • EXTERNAL_SERVICE_ERROR - Third-party service failures
  • SERVICE_UNAVAILABLE - Service temporarily down

Enhanced Controllers (apps/backend/src/controllers/artworkController.ts)

Improvements:

  • Comprehensive input validation
  • Specific error codes and messages
  • Better error categorization
  • User-friendly error responses

Example Response:

{
  "success": false,
  "error": {
    "code": "VALIDATION_ERROR",
    "message": "Validation failed",
    "userMessage": "Please check all required fields and try again.",
    "details": {
      "validationErrors": ["Title is required", "Price must be a valid number"]
    }
  }
}

Frontend Error Handling

Enhanced Error Utility (apps/frontend/src/utils/errorHandler.ts)

New Features:

  • Comprehensive error parsing
  • HTTP status code handling
  • Wallet-specific error handling
  • Timestamp tracking
  • Error categorization

Error Categories:

  • Network errors (connection issues)
  • API errors (server communication)
  • Wallet errors (Freighter wallet issues)
  • Validation errors (input problems)
  • Authentication errors (wallet connection)

Error Context (apps/frontend/src/contexts/ErrorContext.tsx)

Features:

  • Centralized error state management
  • Auto-dismissal of non-critical errors
  • Error deduplication
  • Error history (last 10 errors)

Error Toast Component (apps/frontend/src/components/ErrorToast.tsx)

Features:

  • Visual error notifications
  • Error-specific icons and colors
  • Dismissible notifications
  • Technical details expansion
  • Auto-dismissal for non-critical errors

Enhanced Wallet Hook (apps/frontend/src/hooks/useStellar.ts)

Improvements:

  • Better input validation
  • Transaction timeout handling
  • Comprehensive error categorization
  • State management on errors
  • User-friendly error messages

Error Message Examples

API Errors

  • Network Error: "Network connection failed. Please check your internet connection and try again."
  • Server Error: "Server error occurred. Please try again later."
  • Rate Limit: "Too many requests. Please wait a moment and try again."

Wallet Errors

  • Connection Failed: "Please connect your wallet to continue."
  • Insufficient Balance: "Insufficient balance for this transaction. Please add funds to your wallet."
  • Transaction Cancelled: "Transaction was cancelled. You can try again when ready."
  • Wallet Locked: "Wallet is locked. Please unlock your wallet and try again."

Validation Errors

  • Invalid Input: "Please check your input and try again."
  • Missing Fields: "Please check all required fields and try again."

Integration

The error handling system is integrated into:

  1. App.tsx - Global error boundaries and context providers
  2. API Services - Error handling in all API calls
  3. Wallet Operations - Comprehensive wallet error management
  4. Form Validation - User-friendly validation messages

Benefits

  1. Better User Experience: Clear, actionable error messages
  2. Improved Debugging: Structured error information
  3. Consistent Handling: Unified error management across the app
  4. Error Recovery: Guidance on how to resolve errors
  5. Error Tracking: Centralized error logging and management

Testing

The error handling system can be tested by:

  1. Simulating network failures
  2. Testing wallet connection issues
  3. Triggering validation errors
  4. Testing API error responses
  5. Verifying error toast notifications

Future Enhancements

  1. Error analytics and reporting
  2. Internationalization for error messages
  3. Custom error recovery actions
  4. Error severity levels
  5. Integration with monitoring services