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GuilhermeStrice
599
Services/RecoveryService.cs
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599
Services/RecoveryService.cs
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@ -0,0 +1,599 @@
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using System.Text.Json;
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using DatabaseSnapshotsService.Models;
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using MySqlConnector;
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using System.Text;
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namespace DatabaseSnapshotsService.Services
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{
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public class RecoveryService
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{
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private readonly SnapshotConfiguration _config;
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private readonly string _recoveryPointsPath;
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private readonly string _eventsPath;
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private readonly OptimizedFileService _fileService;
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private readonly EncryptionService _encryptionService;
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private int _nextPointId = 1;
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public RecoveryService(SnapshotConfiguration config)
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{
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_config = config;
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_recoveryPointsPath = Path.Combine(config.EventStore.Path, "recovery_points");
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_eventsPath = config.EventStore.Path;
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_fileService = new OptimizedFileService();
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// Initialize encryption service - match SnapshotService pattern
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_encryptionService = new EncryptionService(
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config.Security.EncryptionKey,
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config.Security.Encryption
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);
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// Ensure directories exist
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Directory.CreateDirectory(_recoveryPointsPath);
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Directory.CreateDirectory(_eventsPath);
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// Load next ID from existing recovery points
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LoadNextPointId();
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}
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public async Task<RecoveryPoint> CreateRecoveryPointAsync(string name, string? description = null)
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{
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// Check if name already exists
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if (await GetRecoveryPointAsync(name) != null)
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{
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throw new ArgumentException($"Recovery point '{name}' already exists");
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}
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var point = new RecoveryPoint
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{
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Id = _nextPointId++,
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Name = name,
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Timestamp = DateTimeOffset.UtcNow.ToUnixTimeSeconds(),
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Description = description,
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CreatedAt = DateTime.UtcNow,
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EventCount = await GetTotalEventCountAsync(),
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LastEventId = await GetLastEventIdAsync()
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};
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// Save recovery point
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await SaveRecoveryPointAsync(point);
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return point;
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}
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public async Task<List<RecoveryPoint>> ListRecoveryPointsAsync()
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{
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var points = new List<RecoveryPoint>();
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var pointFiles = Directory.GetFiles(_recoveryPointsPath, "*.json");
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foreach (var file in pointFiles)
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{
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try
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{
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var jsonBytes = await _fileService.ReadFileOptimizedAsync(file);
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var json = Encoding.UTF8.GetString(jsonBytes);
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var point = JsonSerializer.Deserialize<RecoveryPoint>(json);
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if (point != null)
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{
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points.Add(point);
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}
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}
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catch (Exception ex)
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{
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Console.WriteLine($"Warning: Could not load recovery point from {file}: {ex.Message}");
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}
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}
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return points.OrderByDescending(p => p.CreatedAt).ToList();
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}
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public async Task<RecoveryPoint?> GetRecoveryPointAsync(string name)
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{
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var pointFiles = Directory.GetFiles(_recoveryPointsPath, "*.json");
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foreach (var file in pointFiles)
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{
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try
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{
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var jsonBytes = await _fileService.ReadFileOptimizedAsync(file);
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var json = Encoding.UTF8.GetString(jsonBytes);
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var point = JsonSerializer.Deserialize<RecoveryPoint>(json);
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if (point?.Name == name)
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{
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return point;
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}
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}
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catch (Exception ex)
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{
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Console.WriteLine($"Warning: Could not load recovery point from {file}: {ex.Message}");
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}
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}
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return null;
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}
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public async Task<RestorePreview> PreviewRestoreAsync(long timestamp)
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{
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var preview = new RestorePreview
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{
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TargetTimestamp = timestamp,
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EventCount = 0,
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AffectedTables = new List<string>(),
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EstimatedDuration = TimeSpan.Zero,
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Warnings = new List<string>()
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};
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// Find the closest snapshot before the target timestamp
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var snapshotService = new SnapshotService(_config);
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var snapshots = await snapshotService.ListSnapshotsAsync();
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var closestSnapshot = snapshots
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.Where(s => s.Timestamp <= timestamp)
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.OrderByDescending(s => s.Timestamp)
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.FirstOrDefault();
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if (closestSnapshot != null)
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{
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preview.SnapshotId = closestSnapshot.Id;
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preview.Warnings.Add($"Will use snapshot {closestSnapshot.Id} as base");
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}
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else
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{
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preview.Warnings.Add("No suitable snapshot found - will restore from scratch");
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}
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// Count events that would be applied
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var events = await GetEventsInRangeAsync(closestSnapshot?.Timestamp ?? 0, timestamp);
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preview.EventCount = events.Count;
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// Get affected tables
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preview.AffectedTables = events
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.Select(e => e.Table)
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.Distinct()
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.ToList();
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// Estimate duration (rough calculation)
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preview.EstimatedDuration = TimeSpan.FromSeconds(events.Count * 0.001); // 1ms per event
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return preview;
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}
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public async Task RestoreAsync(long timestamp)
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{
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try
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{
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Console.WriteLine("=== PERFORMING ACTUAL RECOVERY ===");
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Console.WriteLine("This will modify the target database!");
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Console.WriteLine($"Starting restore to timestamp {timestamp}...");
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// Find the target snapshot and build restore chain
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var (targetSnapshot, restoreChain) = await BuildRestoreChainAsync(timestamp);
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if (targetSnapshot == null)
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{
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throw new Exception($"No snapshot found for timestamp {timestamp}");
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}
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Console.WriteLine($"Target snapshot: {targetSnapshot.Id} ({targetSnapshot.Type})");
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Console.WriteLine($"Restore chain: {restoreChain.Count} snapshots");
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// Restore the full snapshot (first in chain)
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var fullSnapshot = restoreChain.First();
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Console.WriteLine($"Restoring full snapshot {fullSnapshot.Id}...");
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await RestoreFromSnapshotAsync(fullSnapshot);
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// Apply incremental snapshots in order
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var incrementals = restoreChain.Skip(1).ToList();
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if (incrementals.Any())
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{
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Console.WriteLine($"Applying {incrementals.Count} incremental snapshots...");
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foreach (var incremental in incrementals)
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{
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Console.WriteLine($"Applying incremental snapshot {incremental.Id}...");
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await ApplyIncrementalSnapshotAsync(incremental);
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}
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}
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Console.WriteLine("Validating restore...");
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await ValidateRestoreAsync();
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Console.WriteLine("Database validation passed");
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Console.WriteLine("Restore completed successfully");
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}
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catch (Exception ex)
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{
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Console.WriteLine($"Restore failed: {ex.Message}");
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throw;
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}
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}
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private async Task<(SnapshotInfo? TargetSnapshot, List<SnapshotInfo> RestoreChain)> BuildRestoreChainAsync(long timestamp)
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{
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var snapshotService = new SnapshotService(_config);
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var snapshots = await snapshotService.ListSnapshotsAsync();
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// Find the target snapshot (closest to timestamp)
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var targetSnapshot = snapshots
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.Where(s => s.Timestamp <= timestamp)
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.OrderByDescending(s => s.Timestamp)
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.FirstOrDefault();
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if (targetSnapshot == null)
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return (null, new List<SnapshotInfo>());
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// Build restore chain: full snapshot + all incrementals up to target
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var restoreChain = new List<SnapshotInfo>();
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if (targetSnapshot.Type.Equals("Full", StringComparison.OrdinalIgnoreCase))
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{
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// Target is a full snapshot, just restore it
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restoreChain.Add(targetSnapshot);
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}
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else
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{
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// Target is incremental, need to find the full snapshot and all incrementals
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var current = targetSnapshot;
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var chain = new List<SnapshotInfo>();
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// Walk backwards to find the full snapshot
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while (current != null)
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{
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chain.Insert(0, current); // Add to front to maintain order
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if (current.Type.Equals("Full", StringComparison.OrdinalIgnoreCase))
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break;
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// Find parent snapshot
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current = snapshots.FirstOrDefault(s => s.Id == current.ParentSnapshotId);
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}
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restoreChain = chain;
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}
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return (targetSnapshot, restoreChain);
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}
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private async Task ApplyIncrementalSnapshotAsync(SnapshotInfo incremental)
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{
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Console.WriteLine($"Applying incremental snapshot {incremental.Id}...");
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if (!File.Exists(incremental.FilePath))
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{
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throw new FileNotFoundException($"Incremental snapshot file not found: {incremental.FilePath}");
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}
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// Read and decompress/decrypt the snapshot file
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var sqlContent = await ReadSnapshotFileAsync(incremental.FilePath);
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// Extract connection details from configuration
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var connectionString = _config.ConnectionString;
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var server = ExtractValue(connectionString, "Server") ?? "localhost";
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var port = ExtractValue(connectionString, "Port") ?? "3306";
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var database = ExtractValue(connectionString, "Database") ?? "trading_platform";
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var userId = ExtractValue(connectionString, "Uid") ?? "root";
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var password = ExtractValue(connectionString, "Pwd") ?? "";
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// Build mysql command arguments
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var mysqlArgs = $"-h{server} -P{port} -u{userId}";
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if (!string.IsNullOrEmpty(password))
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{
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mysqlArgs += $" -p{password}";
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}
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mysqlArgs += $" {database}";
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// Apply the SQL content using mysql via stdin
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var startInfo = new System.Diagnostics.ProcessStartInfo
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{
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FileName = "mysql",
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Arguments = mysqlArgs,
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RedirectStandardInput = true,
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RedirectStandardOutput = true,
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RedirectStandardError = true,
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UseShellExecute = false,
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CreateNoWindow = true
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};
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using var process = System.Diagnostics.Process.Start(startInfo);
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if (process != null)
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{
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// Write the SQL content to mysql stdin
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await process.StandardInput.WriteAsync(sqlContent);
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await process.StandardInput.FlushAsync();
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process.StandardInput.Close();
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string stdOut = await process.StandardOutput.ReadToEndAsync();
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string stdErr = await process.StandardError.ReadToEndAsync();
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await process.WaitForExitAsync();
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if (process.ExitCode != 0)
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{
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Console.WriteLine($"[mysql stdout] {stdOut}");
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Console.WriteLine($"[mysql stderr] {stdErr}");
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throw new Exception($"mysql failed with exit code {process.ExitCode}");
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}
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}
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}
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private async Task<long> GetTotalEventCountAsync()
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{
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var eventFiles = Directory.GetFiles(_eventsPath, "events_*.json");
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long totalCount = 0;
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foreach (var file in eventFiles)
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{
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try
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{
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var lines = await File.ReadAllLinesAsync(file);
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totalCount += lines.Length;
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}
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catch (Exception ex)
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{
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Console.WriteLine($"Warning: Could not read event file {file}: {ex.Message}");
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}
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}
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return totalCount;
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}
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private async Task<long> GetLastEventIdAsync()
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{
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var eventFiles = Directory.GetFiles(_eventsPath, "events_*.json");
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long lastId = 0;
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foreach (var file in eventFiles.OrderByDescending(f => f))
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{
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try
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{
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var lines = await File.ReadAllLinesAsync(file);
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if (lines.Length > 0)
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{
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var lastLine = lines.Last();
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var lastEvent = JsonSerializer.Deserialize<DatabaseEvent>(lastLine);
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if (lastEvent != null && lastEvent.Id > lastId)
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{
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lastId = lastEvent.Id;
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}
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}
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}
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catch (Exception ex)
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{
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Console.WriteLine($"Warning: Could not read event file {file}: {ex.Message}");
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}
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}
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return lastId;
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}
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private async Task<List<DatabaseEvent>> GetEventsInRangeAsync(long fromTimestamp, long toTimestamp)
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{
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var events = new List<DatabaseEvent>();
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var eventFiles = Directory.GetFiles(_eventsPath, "events_*.json");
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foreach (var file in eventFiles)
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{
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try
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{
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var lines = await File.ReadAllLinesAsync(file);
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foreach (var line in lines)
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{
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var evt = JsonSerializer.Deserialize<DatabaseEvent>(line);
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if (evt != null && evt.Timestamp >= fromTimestamp && evt.Timestamp <= toTimestamp)
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{
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events.Add(evt);
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}
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}
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}
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catch (Exception ex)
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{
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Console.WriteLine($"Warning: Could not read event file {file}: {ex.Message}");
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}
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}
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return events.OrderBy(e => e.Timestamp).ToList();
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}
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private async Task RestoreFromSnapshotAsync(SnapshotInfo snapshot)
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{
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Console.WriteLine($"Restoring database from snapshot {snapshot.Id}...");
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if (!File.Exists(snapshot.FilePath))
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{
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throw new FileNotFoundException($"Snapshot file not found: {snapshot.FilePath}");
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}
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// Use programmatic restoration (handles encryption/compression better)
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await RestoreProgrammaticallyAsync(snapshot);
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}
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private async Task RestoreProgrammaticallyAsync(SnapshotInfo snapshot)
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{
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// Read and decompress the snapshot file
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var sqlContent = await ReadSnapshotFileAsync(snapshot.FilePath);
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// Create a temporary file with the SQL content
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var tempFile = Path.GetTempFileName();
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await File.WriteAllTextAsync(tempFile, sqlContent);
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try
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{
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// Extract connection details from configuration
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var connectionString = _config.ConnectionString;
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var server = ExtractValue(connectionString, "Server") ?? "localhost";
|
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var port = ExtractValue(connectionString, "Port") ?? "3306";
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var database = ExtractValue(connectionString, "Database") ?? "trading_platform";
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var userId = ExtractValue(connectionString, "Uid") ?? "root";
|
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var password = ExtractValue(connectionString, "Pwd") ?? "";
|
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|
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// Build mysql command arguments
|
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var mysqlArgs = $"-h{server} -P{port} -u{userId}";
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if (!string.IsNullOrEmpty(password))
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{
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mysqlArgs += $" -p{password}";
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}
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mysqlArgs += $" {database}";
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// Use mysql command to restore the database
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var startInfo = new System.Diagnostics.ProcessStartInfo
|
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{
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FileName = "mysql",
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Arguments = mysqlArgs,
|
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RedirectStandardInput = true,
|
||||
RedirectStandardOutput = true,
|
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RedirectStandardError = true,
|
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UseShellExecute = false,
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CreateNoWindow = true
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};
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using var process = new System.Diagnostics.Process { StartInfo = startInfo };
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process.ErrorDataReceived += (sender, e) =>
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{
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if (!string.IsNullOrEmpty(e.Data))
|
||||
{
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Console.WriteLine($"[mysql restore] {e.Data}");
|
||||
}
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};
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||||
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process.Start();
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process.BeginErrorReadLine();
|
||||
|
||||
// Send the SQL content to mysql via stdin
|
||||
using var writer = process.StandardInput;
|
||||
await writer.WriteAsync(sqlContent);
|
||||
await writer.FlushAsync();
|
||||
writer.Close();
|
||||
|
||||
await process.WaitForExitAsync();
|
||||
|
||||
if (process.ExitCode != 0)
|
||||
{
|
||||
throw new Exception($"mysql restore failed with exit code {process.ExitCode}");
|
||||
}
|
||||
|
||||
Console.WriteLine("Database restore completed successfully using mysql command");
|
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}
|
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finally
|
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{
|
||||
// Clean up temporary file
|
||||
if (File.Exists(tempFile))
|
||||
{
|
||||
File.Delete(tempFile);
|
||||
}
|
||||
}
|
||||
}
|
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|
||||
private async Task<string> ReadSnapshotFileAsync(string filePath)
|
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{
|
||||
try
|
||||
{
|
||||
// Check if file is encrypted and compressed
|
||||
if (filePath.EndsWith(".lz4.enc"))
|
||||
{
|
||||
// First decrypt, then decompress
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var decryptedPath = filePath.Replace(".lz4.enc", ".lz4.tmp");
|
||||
var decompressedPath = filePath.Replace(".lz4.enc", ".sql.tmp");
|
||||
|
||||
try
|
||||
{
|
||||
// Decrypt the file using the instance field
|
||||
await _encryptionService.DecryptFileAsync(filePath, decryptedPath);
|
||||
|
||||
// Decompress the decrypted file
|
||||
await _fileService.DecompressFileStreamingAsync(decryptedPath, decompressedPath);
|
||||
|
||||
// Read the final SQL content
|
||||
var content = await _fileService.ReadFileOptimizedAsync(decompressedPath);
|
||||
return Encoding.UTF8.GetString(content);
|
||||
}
|
||||
finally
|
||||
{
|
||||
// Clean up temporary files
|
||||
if (File.Exists(decryptedPath)) File.Delete(decryptedPath);
|
||||
if (File.Exists(decompressedPath)) File.Delete(decompressedPath);
|
||||
}
|
||||
}
|
||||
else if (filePath.EndsWith(".lz4"))
|
||||
{
|
||||
// Only compressed, not encrypted
|
||||
var tempPath = filePath.Replace(".lz4", ".tmp");
|
||||
await _fileService.DecompressFileStreamingAsync(filePath, tempPath);
|
||||
|
||||
var content = await _fileService.ReadFileOptimizedAsync(tempPath);
|
||||
File.Delete(tempPath); // Clean up temp file
|
||||
return Encoding.UTF8.GetString(content);
|
||||
}
|
||||
else if (filePath.EndsWith(".enc"))
|
||||
{
|
||||
// Only encrypted, not compressed
|
||||
var tempPath = filePath.Replace(".enc", ".tmp");
|
||||
await _encryptionService.DecryptFileAsync(filePath, tempPath);
|
||||
|
||||
var content = await _fileService.ReadFileOptimizedAsync(tempPath);
|
||||
File.Delete(tempPath); // Clean up temp file
|
||||
return Encoding.UTF8.GetString(content);
|
||||
}
|
||||
else
|
||||
{
|
||||
// Plain text file
|
||||
var content = await _fileService.ReadFileOptimizedAsync(filePath);
|
||||
return Encoding.UTF8.GetString(content);
|
||||
}
|
||||
}
|
||||
catch (Exception ex)
|
||||
{
|
||||
throw new InvalidOperationException($"Failed to read snapshot file {filePath}: {ex.Message}", ex);
|
||||
}
|
||||
}
|
||||
|
||||
private async Task ValidateRestoreAsync()
|
||||
{
|
||||
// Basic validation - check if database is accessible and has expected data
|
||||
using var connection = new MySqlConnection(_config.ConnectionString);
|
||||
await connection.OpenAsync();
|
||||
|
||||
// Check if we can query the database
|
||||
using var command = new MySqlCommand("SELECT COUNT(*) FROM information_schema.tables WHERE table_schema = DATABASE()", connection);
|
||||
var tableCount = await command.ExecuteScalarAsync();
|
||||
|
||||
if (Convert.ToInt32(tableCount) == 0)
|
||||
{
|
||||
throw new Exception("Database validation failed: No tables found after restore");
|
||||
}
|
||||
}
|
||||
|
||||
private async Task SaveRecoveryPointAsync(RecoveryPoint point)
|
||||
{
|
||||
var pointFile = Path.Combine(_recoveryPointsPath, $"{point.Name}.json");
|
||||
var json = JsonSerializer.Serialize(point, new JsonSerializerOptions { WriteIndented = true });
|
||||
var jsonBytes = Encoding.UTF8.GetBytes(json);
|
||||
|
||||
await _fileService.WriteFileOptimizedAsync(pointFile, jsonBytes);
|
||||
}
|
||||
|
||||
private void LoadNextPointId()
|
||||
{
|
||||
var pointFiles = Directory.GetFiles(_recoveryPointsPath, "*.json");
|
||||
if (pointFiles.Length > 0)
|
||||
{
|
||||
var maxId = pointFiles
|
||||
.Select(f => Path.GetFileNameWithoutExtension(f))
|
||||
.Where(name => int.TryParse(name, out _))
|
||||
.Select(int.Parse)
|
||||
.DefaultIfEmpty(0)
|
||||
.Max();
|
||||
|
||||
_nextPointId = maxId + 1;
|
||||
}
|
||||
}
|
||||
|
||||
private string? ExtractValue(string connectionString, string key)
|
||||
{
|
||||
var pairs = connectionString.Split(';');
|
||||
foreach (var pair in pairs)
|
||||
{
|
||||
var keyValue = pair.Split('=');
|
||||
if (keyValue.Length == 2 && keyValue[0].Trim().Equals(key, StringComparison.OrdinalIgnoreCase))
|
||||
{
|
||||
return keyValue[1].Trim();
|
||||
}
|
||||
}
|
||||
return null;
|
||||
}
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user