Implement backup and restore functionality; add IBackupService and BackupService; refactor services to use DbContextFactory

2026-04-03 10:53:53 +02:00
parent 0923c037eb
commit 387c18e834
15 changed files with 411 additions and 71 deletions
@@ -0,0 +1,146 @@
+using System.Diagnostics;
+using System.Runtime.InteropServices;
+using Duempelkas.App.Services;
+using Microsoft.Data.Sqlite;
+
+namespace Duempelkas.Infrastructure.Services;
+
+public class BackupService : IBackupService
+{
+    private static readonly string DbPath = Path.Combine(
+        Path.GetDirectoryName(Environment.ProcessPath ?? AppContext.BaseDirectory) ?? AppContext.BaseDirectory,
+        "duempelkas.db");
+
+    public async Task<string> CreateBackupAsync()
+    {
+        if (!File.Exists(DbPath))
+        {
+            return "Keine Datenbankdatei gefunden.";
+        }
+
+        var suggestedFileName = $"duempelkas-backup-{DateTime.Now:yyMMdd-HHmm}.bak";
+        var backupPath = await ShowSaveDialogAsync(suggestedFileName);
+
+        if (string.IsNullOrWhiteSpace(backupPath))
+        {
+            return "Backup wurde abgebrochen.";
+        }
+
+        backupPath = Path.ChangeExtension(backupPath, ".bak");
+
+        try
+        {
+            File.Copy(DbPath, backupPath, overwrite: true);
+            return $"Backup gespeichert: {backupPath}";
+        }
+        catch (Exception ex)
+        {
+            return $"Backup fehlgeschlagen: {ex.Message}";
+        }
+    }
+
+    public async Task<string> RestoreBackupAsync()
+    {
+        var backupPath = await ShowOpenDialogAsync();
+        if (string.IsNullOrWhiteSpace(backupPath))
+        {
+            return "Wiederherstellung wurde abgebrochen.";
+        }
+
+        if (!File.Exists(backupPath))
+        {
+            return "Die gewählte Backup-Datei wurde nicht gefunden.";
+        }
+
+        try
+        {
+            // Ensure no pooled connection keeps stale handles to the previous DB file.
+            SqliteConnection.ClearAllPools();
+
+            var targetDirectory = Path.GetDirectoryName(DbPath);
+            if (!string.IsNullOrWhiteSpace(targetDirectory))
+            {
+                Directory.CreateDirectory(targetDirectory);
+            }
+
+            File.Copy(backupPath, DbPath, overwrite: true);
+            SqliteConnection.ClearAllPools();
+            return "Wiederherstellung erfolgreich. Die Datenbank wurde neu geladen.";
+        }
+        catch (Exception ex)
+        {
+            return $"Wiederherstellung fehlgeschlagen: {ex.Message}";
+        }
+    }
+
+    private static Task<string?> ShowSaveDialogAsync(string suggestedFileName)
+    {
+        return Task.Run(() =>
+        {
+            if (!RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
+            {
+                var documentsPath = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);
+                return Path.Combine(documentsPath, suggestedFileName);
+            }
+
+            var script = $@"
+Add-Type -AssemblyName System.Windows.Forms
+$dialog = New-Object System.Windows.Forms.SaveFileDialog
+$dialog.Filter = 'Backup-Dateien (*.bak)|*.bak'
+$dialog.DefaultExt = 'bak'
+$dialog.AddExtension = $true
+$dialog.OverwritePrompt = $true
+$dialog.FileName = '{suggestedFileName.Replace("'", "''")}'
+$dialog.Title = 'Backup speichern'
+if ($dialog.ShowDialog() -eq 'OK') {{ $dialog.FileName }} else {{ '' }}
+";
+
+            return RunPowerShellDialog(script);
+        });
+    }
+
+    private static Task<string?> ShowOpenDialogAsync()
+    {
+        return Task.Run(() =>
+        {
+            if (!RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
+            {
+                return null;
+            }
+
+            var script = @"
+Add-Type -AssemblyName System.Windows.Forms
+$dialog = New-Object System.Windows.Forms.OpenFileDialog
+$dialog.Filter = 'Backup-Dateien (*.bak)|*.bak'
+$dialog.Multiselect = $false
+$dialog.Title = 'Backup auswählen'
+if ($dialog.ShowDialog() -eq 'OK') { $dialog.FileName } else { '' }
+";
+
+            return RunPowerShellDialog(script);
+        });
+    }
+
+    private static string? RunPowerShellDialog(string script)
+    {
+        var psi = new ProcessStartInfo
+        {
+            FileName = "powershell",
+            Arguments = $"-NoProfile -Command \"{script.Replace("\"", "\\\"") }\"",
+            RedirectStandardOutput = true,
+            UseShellExecute = false,
+            CreateNoWindow = true
+        };
+
+        using var process = Process.Start(psi);
+        if (process == null)
+        {
+            return null;
+        }
+
+        var result = process.StandardOutput.ReadToEnd().Trim();
+        process.WaitForExit();
+
+        return string.IsNullOrWhiteSpace(result) ? null : result;
+    }
+}