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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tests/test_error_handling.py
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tests/test_error_handling.py
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"""
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Tests for error handling and logging functionality.
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Tests error handlers, request/response logging, database rollback on errors,
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and proper error responses (JSON vs HTML).
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"""
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import json
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import logging
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import pytest
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from flask import Flask
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from sqlalchemy.exc import SQLAlchemyError
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from web.app import create_app
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@pytest.fixture
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def app():
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"""Create test Flask app."""
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test_config = {
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'TESTING': True,
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'SQLALCHEMY_DATABASE_URI': 'sqlite:///:memory:',
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'SECRET_KEY': 'test-secret-key',
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'WTF_CSRF_ENABLED': False
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}
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app = create_app(test_config)
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return app
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@pytest.fixture
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def client(app):
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"""Create test client."""
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return app.test_client()
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class TestErrorHandlers:
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"""Test error handler functionality."""
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def test_404_json_response(self, client):
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"""Test 404 error returns JSON for API requests."""
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response = client.get('/api/nonexistent')
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assert response.status_code == 404
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assert response.content_type == 'application/json'
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data = json.loads(response.data)
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assert 'error' in data
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assert data['error'] == 'Not Found'
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assert 'message' in data
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def test_404_html_response(self, client):
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"""Test 404 error returns HTML for web requests."""
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response = client.get('/nonexistent')
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assert response.status_code == 404
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assert 'text/html' in response.content_type
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assert b'404' in response.data
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def test_400_json_response(self, client):
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"""Test 400 error returns JSON for API requests."""
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# Trigger 400 by sending invalid JSON
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response = client.post(
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'/api/scans',
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data='invalid json',
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content_type='application/json'
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)
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assert response.status_code in [400, 401] # 401 if auth required
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def test_405_method_not_allowed(self, client):
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"""Test 405 error for method not allowed."""
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# Try POST to health check (only GET allowed)
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response = client.post('/api/scans/health')
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assert response.status_code == 405
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data = json.loads(response.data)
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assert 'error' in data
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assert data['error'] == 'Method Not Allowed'
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def test_json_accept_header(self, client):
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"""Test JSON response when Accept header specifies JSON."""
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response = client.get(
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'/nonexistent',
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headers={'Accept': 'application/json'}
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)
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assert response.status_code == 404
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assert response.content_type == 'application/json'
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class TestLogging:
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"""Test logging functionality."""
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def test_request_logging(self, client, caplog):
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"""Test that requests are logged."""
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with caplog.at_level(logging.INFO):
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response = client.get('/api/scans/health')
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# Check log messages
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log_messages = [record.message for record in caplog.records]
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# Should log incoming request and response
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assert any('GET /api/scans/health' in msg for msg in log_messages)
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def test_error_logging(self, client, caplog):
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"""Test that errors are logged with full context."""
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with caplog.at_level(logging.INFO):
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client.get('/api/nonexistent')
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# Check that 404 was logged
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log_messages = [record.message for record in caplog.records]
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assert any('not found' in msg.lower() or '404' in msg for msg in log_messages)
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def test_request_id_in_logs(self, client, caplog):
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"""Test that request ID is included in log records."""
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with caplog.at_level(logging.INFO):
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client.get('/api/scans/health')
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# Check that log records have request_id attribute
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for record in caplog.records:
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assert hasattr(record, 'request_id')
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assert record.request_id # Should not be empty
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class TestRequestResponseHandlers:
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"""Test request and response handler middleware."""
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def test_request_id_header(self, client):
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"""Test that response includes X-Request-ID header for API requests."""
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response = client.get('/api/scans/health')
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assert 'X-Request-ID' in response.headers
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def test_request_duration_header(self, client):
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"""Test that response includes X-Request-Duration-Ms header."""
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response = client.get('/api/scans/health')
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assert 'X-Request-Duration-Ms' in response.headers
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duration = float(response.headers['X-Request-Duration-Ms'])
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assert duration >= 0 # Should be non-negative
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def test_security_headers(self, client):
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"""Test that security headers are added to API responses."""
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response = client.get('/api/scans/health')
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# Check security headers
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assert response.headers.get('X-Content-Type-Options') == 'nosniff'
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assert response.headers.get('X-Frame-Options') == 'DENY'
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assert response.headers.get('X-XSS-Protection') == '1; mode=block'
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def test_request_timing(self, client):
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"""Test that request timing is calculated correctly."""
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response = client.get('/api/scans/health')
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duration_header = response.headers.get('X-Request-Duration-Ms')
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assert duration_header is not None
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duration = float(duration_header)
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# Should complete in reasonable time (less than 5 seconds)
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assert duration < 5000
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class TestDatabaseErrorHandling:
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"""Test database error handling and rollback."""
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def test_database_rollback_on_error(self, app):
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"""Test that database session is rolled back on error."""
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# This test would require triggering a database error
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# For now, just verify the error handler is registered
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from sqlalchemy.exc import SQLAlchemyError
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# Check that SQLAlchemyError handler is registered
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assert SQLAlchemyError in app.error_handler_spec[None]
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class TestLogRotation:
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"""Test log rotation configuration."""
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def test_log_files_created(self, app, tmp_path):
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"""Test that log files are created in logs directory."""
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import os
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from pathlib import Path
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# Check that logs directory exists
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log_dir = Path('logs')
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# Note: In test environment, logs may not be created immediately
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# Just verify the configuration is set up
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# Verify app logger has handlers
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assert len(app.logger.handlers) > 0
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# Verify at least one handler is a RotatingFileHandler
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from logging.handlers import RotatingFileHandler
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has_rotating_handler = any(
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isinstance(h, RotatingFileHandler)
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for h in app.logger.handlers
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)
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assert has_rotating_handler, "Should have RotatingFileHandler configured"
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def test_log_handler_configuration(self, app):
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"""Test that log handlers are configured correctly."""
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from logging.handlers import RotatingFileHandler
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# Find RotatingFileHandler
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rotating_handlers = [
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h for h in app.logger.handlers
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if isinstance(h, RotatingFileHandler)
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]
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assert len(rotating_handlers) > 0, "Should have rotating file handlers"
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# Check handler configuration
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for handler in rotating_handlers:
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# Should have max size configured
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assert handler.maxBytes > 0
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# Should have backup count configured
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assert handler.backupCount > 0
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class TestStructuredLogging:
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"""Test structured logging features."""
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def test_log_format_includes_request_id(self, client, caplog):
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"""Test that log format includes request ID."""
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with caplog.at_level(logging.INFO):
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client.get('/api/scans/health')
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# Verify log records have request_id
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for record in caplog.records:
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assert hasattr(record, 'request_id')
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def test_error_log_includes_traceback(self, app, caplog):
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"""Test that errors are logged with traceback."""
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with app.test_request_context('/api/test'):
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with caplog.at_level(logging.ERROR):
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try:
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raise ValueError("Test error")
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except ValueError as e:
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app.logger.error("Test error occurred", exc_info=True)
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# Check that traceback is in logs
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log_output = caplog.text
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assert 'Test error' in log_output
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assert 'Traceback' in log_output or 'ValueError' in log_output
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class TestErrorTemplates:
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"""Test error template rendering."""
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def test_404_template_exists(self, client):
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"""Test that 404 error template is rendered."""
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response = client.get('/nonexistent')
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assert response.status_code == 404
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assert b'404' in response.data
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assert b'Page Not Found' in response.data or b'Not Found' in response.data
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def test_500_template_exists(self, app):
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"""Test that 500 error template can be rendered."""
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# We can't easily trigger a 500 without breaking the app
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# Just verify the template file exists
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from pathlib import Path
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template_path = Path('web/templates/errors/500.html')
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assert template_path.exists(), "500 error template should exist"
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def test_error_template_styling(self, client):
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"""Test that error templates include styling."""
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response = client.get('/nonexistent')
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# Should include CSS styling
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assert b'style' in response.data or b'css' in response.data.lower()
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if __name__ == '__main__':
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pytest.main([__file__, '-v'])
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