Phase 2 Step 7: Implement Error Handling & Logging
Comprehensive error handling and logging system with production-ready features for monitoring, debugging, and user experience. Enhanced Logging System: - Implemented RotatingFileHandler (10MB per file, 10 backups, 100MB total) - Separate error log file for ERROR level messages with detailed tracebacks - Structured logging with request IDs, timestamps, and module names - RequestIDLogFilter for automatic request context injection - Console logging in debug mode with simplified format Request/Response Middleware: - Request ID generation using UUID (8-character prefix for readability) - Request timing with millisecond precision - User authentication context in all logs - Response duration tracking and headers (X-Request-ID, X-Request-Duration-Ms) - Security headers: X-Content-Type-Options, X-Frame-Options, X-XSS-Protection Database Error Handling: - Enabled SQLite WAL mode for better concurrency with background jobs - Busy timeout configuration (15 seconds) for lock handling - Automatic rollback on request exceptions via teardown handler - Dedicated SQLAlchemyError handler with explicit rollback - Connection pooling with pre-ping validation Comprehensive Error Handlers: - Content negotiation: JSON responses for API, HTML for web requests - Error handlers for 400, 401, 403, 404, 405, 500 - Database rollback in all error handlers - Full exception logging with traceback for debugging Custom Error Templates: - Created web/templates/errors/ directory with 6 templates - Dark theme matching application design (slate colors) - User-friendly error messages with navigation - Templates: 400, 401, 403, 404, 405, 500 Testing: - Comprehensive test suite (320+ lines) in tests/test_error_handling.py - Tests for JSON vs HTML error responses - Request ID and duration header verification - Security header validation - Log rotation configuration tests - Structured logging tests Bug Fix: - Fixed pagination bug in scans API endpoint - Changed paginated_result.total_pages to paginated_result.pages - Resolves AttributeError when listing scans Files Added: - tests/test_error_handling.py - web/templates/errors/400.html - web/templates/errors/401.html - web/templates/errors/403.html - web/templates/errors/404.html - web/templates/errors/405.html - web/templates/errors/500.html Files Modified: - web/app.py (logging, error handlers, request handlers, database config) - web/api/scans.py (pagination bug fix) - docs/ai/PHASE2.md (mark Step 7 complete, update progress to 86%) Phase 2 Progress: 12/14 days complete (86%)
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web/templates/errors/404.html
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84
web/templates/errors/404.html
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>404 - Page Not Found | SneakyScanner</title>
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<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0/dist/css/bootstrap.min.css" rel="stylesheet">
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<style>
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body {
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font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
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background-color: #0f172a;
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color: #e2e8f0;
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min-height: 100vh;
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display: flex;
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align-items: center;
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justify-content: center;
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}
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.error-container {
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text-align: center;
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max-width: 600px;
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padding: 2rem;
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}
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.error-code {
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font-size: 8rem;
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font-weight: 700;
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color: #60a5fa;
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line-height: 1;
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margin-bottom: 1rem;
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text-shadow: 0 0 20px rgba(96, 165, 250, 0.3);
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}
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.error-title {
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font-size: 2rem;
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font-weight: 600;
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color: #e2e8f0;
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margin-bottom: 1rem;
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}
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.error-message {
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font-size: 1.1rem;
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color: #94a3b8;
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margin-bottom: 2rem;
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line-height: 1.6;
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}
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.btn-primary {
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background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
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border: none;
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padding: 0.75rem 2rem;
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font-size: 1rem;
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font-weight: 500;
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border-radius: 0.5rem;
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transition: all 0.3s;
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box-shadow: 0 4px 6px rgba(59, 130, 246, 0.2);
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}
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.btn-primary:hover {
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transform: translateY(-2px);
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box-shadow: 0 6px 12px rgba(59, 130, 246, 0.3);
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background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
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}
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.error-icon {
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font-size: 4rem;
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margin-bottom: 1rem;
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}
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</style>
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</head>
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<body>
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<div class="error-container">
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<div class="error-icon">🔍</div>
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<div class="error-code">404</div>
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<h1 class="error-title">Page Not Found</h1>
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<p class="error-message">
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The page you're looking for doesn't exist or has been moved.
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<br>
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Let's get you back on track.
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</p>
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<a href="/" class="btn btn-primary">Go to Dashboard</a>
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</div>
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</body>
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</html>
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