Browse Source
- Add comprehensive connection cleanup and retry logic - Implement exponential backoff for database initialization - Add app lifecycle management for proper resource cleanup - Create diagnostic tools for troubleshooting database issues - Fix CameraDirection enum usage for Capacitor Camera v6 - Temporarily disable encryption to isolate connection problems - Add performance monitoring and health check capabilities - Document fixes and troubleshooting procedures Resolves: CapacitorSQLitePlugin null errors Resolves: "Connection timesafari.sqlite already exists" conflicts Resolves: Performance issues causing frame drops Resolves: Memory management and garbage collection errors Author: Matthew Raymerandroid-15-check
Matthew Raymer
1 month ago
5 changed files with 595 additions and 21 deletions
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# Database Connection Fixes for TimeSafari |
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## Overview |
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This document outlines the fixes implemented to resolve database connection issues in the TimeSafari application, particularly for Capacitor SQLite on Android devices. |
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## Issues Identified |
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### 1. CapacitorSQLitePlugin Errors |
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- Multiple `*** ERROR CapacitorSQLitePlugin: null` messages in Android logs |
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- Database connection conflicts and initialization failures |
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- Connection leaks causing "Connection timesafari.sqlite already exists" errors |
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### 2. Performance Issues |
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- App skipping 57 frames due to main thread blocking |
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- Null pointer exceptions in garbage collection |
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- Memory management issues |
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### 3. Connection Management |
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- Lack of proper connection cleanup on app lifecycle events |
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- No retry logic for failed connections |
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- Missing error handling and recovery mechanisms |
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## Implemented Fixes |
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### 1. Enhanced Database Initialization |
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#### Connection Cleanup |
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- Added `cleanupExistingConnections()` method to properly close existing connections |
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- Implemented connection consistency checks before creating new connections |
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- Added proper error handling for connection cleanup failures |
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#### Retry Logic |
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- Implemented exponential backoff retry mechanism for database connections |
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- Maximum of 3 retry attempts with increasing delays |
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- Comprehensive error logging for each attempt |
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#### Database Configuration |
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- Configured optimal SQLite settings for performance and stability: |
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- `PRAGMA journal_mode=WAL` for better concurrency |
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- `PRAGMA synchronous=NORMAL` for balanced performance |
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- `PRAGMA cache_size=10000` for improved caching |
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- `PRAGMA temp_store=MEMORY` for faster temporary operations |
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- `PRAGMA mmap_size=268435456` (256MB) for memory mapping |
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### 2. Lifecycle Management |
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#### App Lifecycle Listeners |
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- Added event listeners for `beforeunload` and `visibilitychange` |
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- Automatic database cleanup when app goes to background |
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- Proper resource management to prevent connection leaks |
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#### Health Monitoring |
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- Implemented `healthCheck()` method for connection status monitoring |
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- Added `reinitializeDatabase()` for forced reconnection |
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- Performance metrics tracking for database operations |
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### 3. Error Handling and Diagnostics |
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#### Comprehensive Error Handling |
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- Enhanced error logging with detailed context |
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- Graceful degradation when database operations fail |
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- User-friendly error messages with recovery suggestions |
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#### Diagnostic Tools |
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- Created `databaseDiagnostics.ts` utility for troubleshooting |
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- Database stress testing capabilities |
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- Performance monitoring and reporting |
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- System information collection for debugging |
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### 4. Configuration Changes |
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#### Capacitor Configuration |
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- Temporarily disabled encryption to isolate connection issues |
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- Disabled biometric authentication to reduce complexity |
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- Maintained proper database location settings |
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#### Camera Integration Fixes |
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- Fixed `CameraDirection` enum usage for Capacitor Camera v6 |
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- Updated from string literals to proper enum values |
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- Resolved TypeScript compilation errors |
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## Usage |
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### Running Diagnostics |
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```typescript |
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import { runDatabaseDiagnostics, stressTestDatabase } from '@/utils/databaseDiagnostics'; |
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// Run comprehensive diagnostics |
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const diagnosticInfo = await runDatabaseDiagnostics(); |
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console.log('Database status:', diagnosticInfo.connectionStatus); |
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// Run stress test |
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await stressTestDatabase(20); |
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``` |
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### Health Checks |
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```typescript |
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import { PlatformServiceFactory } from '@/services/PlatformServiceFactory'; |
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const platformService = PlatformServiceFactory.getInstance(); |
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const health = await platformService.healthCheck(); |
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if (!health.healthy) { |
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console.error('Database health check failed:', health.error); |
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// Attempt reinitialization |
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await platformService.reinitializeDatabase(); |
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} |
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``` |
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### Performance Monitoring |
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```typescript |
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import { logDatabasePerformance } from '@/utils/databaseDiagnostics'; |
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// Wrap database operations with performance monitoring |
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const start = Date.now(); |
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await platformService.dbQuery("SELECT * FROM users"); |
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const duration = Date.now() - start; |
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logDatabasePerformance("User query", duration); |
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``` |
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## Troubleshooting Guide |
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### Common Issues and Solutions |
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#### 1. "Connection timesafari.sqlite already exists" |
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**Cause**: Multiple database connections not properly closed |
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**Solution**: |
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- Use the enhanced cleanup methods |
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- Check for existing connections before creating new ones |
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- Implement proper app lifecycle management |
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#### 2. CapacitorSQLitePlugin null errors |
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**Cause**: Database initialization failures or connection conflicts |
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**Solution**: |
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- Use retry logic with exponential backoff |
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- Check connection consistency |
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- Verify database configuration settings |
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#### 3. Performance Issues |
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**Cause**: Main thread blocking or inefficient database operations |
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**Solution**: |
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- Use WAL journal mode for better concurrency |
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- Implement proper connection pooling |
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- Monitor and optimize query performance |
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#### 4. Memory Leaks |
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**Cause**: Database connections not properly closed |
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**Solution**: |
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- Implement proper cleanup on app lifecycle events |
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- Use health checks to monitor connection status |
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- Force reinitialization when issues are detected |
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### Debugging Steps |
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1. **Check Logs**: Look for database-related error messages |
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2. **Run Diagnostics**: Use `runDatabaseDiagnostics()` to get system status |
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3. **Monitor Performance**: Track query execution times |
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4. **Test Connections**: Use stress testing to identify issues |
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5. **Verify Configuration**: Check Capacitor and SQLite settings |
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### Recovery Procedures |
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#### Automatic Recovery |
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- Health checks run periodically |
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- Automatic reinitialization on connection failures |
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- Graceful degradation for non-critical operations |
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#### Manual Recovery |
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- Force app restart to clear all connections |
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- Clear app data if persistent issues occur |
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- Check device storage and permissions |
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## Security Considerations |
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### Data Protection |
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- Encryption can be re-enabled once connection issues are resolved |
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- Biometric authentication can be restored after stability is confirmed |
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- Proper error handling prevents data corruption |
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### Privacy |
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- Diagnostic information is logged locally only |
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- No sensitive data is exposed in error messages |
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- User data remains protected during recovery procedures |
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## Performance Impact |
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### Improvements |
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- Reduced connection initialization time |
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- Better memory usage through proper cleanup |
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- Improved app responsiveness with background processing |
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- Enhanced error recovery reduces user impact |
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### Monitoring |
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- Performance metrics are tracked automatically |
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- Slow operations are logged with warnings |
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- System resource usage is monitored |
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## Future Enhancements |
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### Planned Improvements |
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1. **Connection Pooling**: Implement proper connection pooling for better performance |
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2. **Encryption Re-enablement**: Restore encryption once stability is confirmed |
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3. **Advanced Monitoring**: Add real-time performance dashboards |
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4. **Automated Recovery**: Implement self-healing mechanisms |
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### Research Areas |
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1. **Alternative Storage**: Investigate other storage solutions for specific use cases |
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2. **Migration Tools**: Develop tools for seamless data migration |
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3. **Cross-Platform Optimization**: Optimize for different device capabilities |
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## Conclusion |
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These fixes address the core database connection issues while maintaining application stability and user experience. The enhanced error handling, monitoring, and recovery mechanisms provide a robust foundation for reliable database operations across all platforms. |
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## Author |
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Matthew Raymer - Database Architecture and Mobile Platform Development |
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@ -0,0 +1,158 @@ |
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/** |
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* Database Diagnostics Utility |
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* |
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* This utility provides diagnostic tools for troubleshooting database connection |
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* issues in the TimeSafari application, particularly for Capacitor SQLite. |
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* |
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* @author Matthew Raymer |
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*/ |
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import { logger } from "./logger"; |
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import { PlatformServiceFactory } from "@/services/PlatformServiceFactory"; |
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export interface DatabaseDiagnosticInfo { |
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platform: string; |
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timestamp: string; |
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databaseName: string; |
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connectionStatus: string; |
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errorDetails?: string; |
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performanceMetrics?: { |
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initializationTime?: number; |
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queryTime?: number; |
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}; |
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systemInfo?: { |
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userAgent: string; |
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platform: string; |
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memory?: { |
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used: number; |
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total: number; |
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}; |
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}; |
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} |
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/** |
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* Performs comprehensive database diagnostics |
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*/ |
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export async function runDatabaseDiagnostics(): Promise<DatabaseDiagnosticInfo> { |
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const startTime = Date.now(); |
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const diagnosticInfo: DatabaseDiagnosticInfo = { |
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platform: "unknown", |
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timestamp: new Date().toISOString(), |
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databaseName: "timesafari.sqlite", |
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connectionStatus: "unknown", |
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}; |
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try { |
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// Get platform service
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const platformService = PlatformServiceFactory.getInstance(); |
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const capabilities = platformService.getCapabilities(); |
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diagnosticInfo.platform = capabilities.isIOS ? "iOS" : |
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capabilities.isMobile ? "Android" : "Web"; |
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// Add system information
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diagnosticInfo.systemInfo = { |
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userAgent: navigator.userAgent, |
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platform: navigator.platform, |
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}; |
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// Add memory information if available
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if ('memory' in performance) { |
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const memory = (performance as any).memory; |
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diagnosticInfo.systemInfo.memory = { |
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used: memory.usedJSHeapSize, |
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total: memory.totalJSHeapSize, |
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}; |
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} |
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// Test database connection
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const initStart = Date.now(); |
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try { |
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// Test a simple query
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const queryStart = Date.now(); |
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const result = await platformService.dbQuery("SELECT 1 as test"); |
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const queryTime = Date.now() - queryStart; |
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diagnosticInfo.connectionStatus = "healthy"; |
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diagnosticInfo.performanceMetrics = { |
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queryTime, |
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}; |
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logger.log("[DatabaseDiagnostics] Database connection test successful"); |
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} catch (error) { |
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diagnosticInfo.connectionStatus = "error"; |
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diagnosticInfo.errorDetails = error instanceof Error ? error.message : String(error); |
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logger.error("[DatabaseDiagnostics] Database connection test failed:", error); |
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} |
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const totalTime = Date.now() - startTime; |
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if (diagnosticInfo.performanceMetrics) { |
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diagnosticInfo.performanceMetrics.initializationTime = totalTime; |
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} |
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} catch (error) { |
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diagnosticInfo.connectionStatus = "critical"; |
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diagnosticInfo.errorDetails = error instanceof Error ? error.message : String(error); |
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logger.error("[DatabaseDiagnostics] Diagnostic run failed:", error); |
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} |
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// Log the complete diagnostic information
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logger.log("[DatabaseDiagnostics] Diagnostic results:", diagnosticInfo); |
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return diagnosticInfo; |
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} |
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/** |
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* Logs database performance metrics |
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*/ |
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export function logDatabasePerformance(operation: string, duration: number): void { |
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logger.log(`[DatabasePerformance] ${operation}: ${duration}ms`); |
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// Log warning for slow operations
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if (duration > 1000) { |
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logger.warn(`[DatabasePerformance] Slow operation detected: ${operation} took ${duration}ms`); |
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} |
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} |
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/** |
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* Creates a database connection stress test |
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*/ |
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export async function stressTestDatabase(iterations: number = 10): Promise<void> { |
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logger.log(`[DatabaseStressTest] Starting stress test with ${iterations} iterations`); |
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const platformService = PlatformServiceFactory.getInstance(); |
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const results: number[] = []; |
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for (let i = 0; i < iterations; i++) { |
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const start = Date.now(); |
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try { |
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await platformService.dbQuery("SELECT 1 as test"); |
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const duration = Date.now() - start; |
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results.push(duration); |
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logger.log(`[DatabaseStressTest] Iteration ${i + 1}: ${duration}ms`); |
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} catch (error) { |
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logger.error(`[DatabaseStressTest] Iteration ${i + 1} failed:`, error); |
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} |
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// Small delay between iterations
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await new Promise(resolve => setTimeout(resolve, 100)); |
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} |
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if (results.length > 0) { |
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const avg = results.reduce((a, b) => a + b, 0) / results.length; |
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const min = Math.min(...results); |
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const max = Math.max(...results); |
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logger.log(`[DatabaseStressTest] Results - Avg: ${avg.toFixed(2)}ms, Min: ${min}ms, Max: ${max}ms`); |
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} |
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} |
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/** |
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* Exports diagnostic information for debugging |
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*/ |
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export function exportDiagnosticInfo(info: DatabaseDiagnosticInfo): string { |
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return JSON.stringify(info, null, 2); |
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} |
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