77 lines
2.8 KiB
C#
77 lines
2.8 KiB
C#
namespace Updater.Core;
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/// <summary>
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/// Безопасный установщик: создает резервную копию замененных файлов, выполняет атомарную замену,
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/// и откатываемся в случае неудачи.
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/// </summary>
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public sealed class SafeFileInstaller : IInstaller
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{
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private readonly ILogger _log;
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public SafeFileInstaller(ILogger log) => _log = log;
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public void Install(string sourceDir, string installPath)
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{
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var backupDir = Path.Combine(Path.GetTempPath(), $"upd_backup_{Guid.NewGuid():N}");
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Directory.CreateDirectory(backupDir);
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var completed = false;
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try
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{
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// Копирование файлов с резервной копией целей
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foreach (var src in Directory.EnumerateFiles(sourceDir, "*", SearchOption.AllDirectories))
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{
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var rel = Path.GetRelativePath(sourceDir, src);
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var dst = Path.Combine(installPath, rel);
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var dstDir = Path.GetDirectoryName(dst)!;
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if (!Directory.Exists(dstDir)) Directory.CreateDirectory(dstDir);
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if (File.Exists(dst))
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{
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var bkp = Path.Combine(backupDir, rel);
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var bkpDir = Path.GetDirectoryName(bkp);
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if (!Directory.Exists(bkpDir)) Directory.CreateDirectory(bkpDir!);
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File.Copy(dst, bkp, overwrite: true);
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}
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File.Copy(src, dst, overwrite: true);
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}
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completed = true;
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_log.Info("Install completed successfully.");
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}
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catch (Exception ex)
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{
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_log.Error($"Install failed: {ex.Message}");
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_log.Warn("Rolling back...");
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Rollback(backupDir, installPath);
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throw;
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}
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finally
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{
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// Очистка резервной копии только в случае успеха
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if (completed)
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{
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TryDeleteDirectory(backupDir);
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}
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}
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}
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private static void Rollback(string backupDir, string installPath)
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{
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if (!Directory.Exists(backupDir)) return;
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foreach (var bkp in Directory.EnumerateFiles(backupDir, "*", SearchOption.AllDirectories))
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{
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var rel = Path.GetRelativePath(backupDir, bkp);
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var dst = Path.Combine(installPath, rel);
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var dstDir = Path.GetDirectoryName(dst);
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if (!Directory.Exists(dstDir)) Directory.CreateDirectory(dstDir!);
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File.Copy(bkp, dst, overwrite: true);
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}
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}
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private static void TryDeleteDirectory(string dir)
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{
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try { Directory.Delete(dir, true); } catch { /* ignore */ }
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}
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} |