refactored hardlink service

2025-02-21 23:57:43 +02:00
parent 029f255351
commit 8c8d412ef1
6 changed files with 175 additions and 129 deletions
@@ -0,0 +1,55 @@
+using System.Runtime.InteropServices;
+using Microsoft.Extensions.Logging;
+using Microsoft.Win32.SafeHandles;
+
+namespace Infrastructure.Verticals.Files;
+
+public class WindowsHardlinkFileService
+{
+    private readonly ILogger<WindowsHardlinkFileService> _logger;
+
+    public WindowsHardlinkFileService(ILogger<WindowsHardlinkFileService> logger)
+    {
+        _logger = logger;
+    }
+    
+    public long GetWindowsHardLinkCount(string filePath)
+    {
+        try
+        {
+            using SafeFileHandle fileStream = File.OpenHandle(filePath);
+
+            if (GetFileInformationByHandle(fileStream, out var file))
+            {
+                return file.NumberOfLinks;
+            }
+        }
+        catch (Exception exception)
+        {
+            // TODO log download name?
+            _logger.LogError(exception, "failed to stat Windows file {file}", filePath);
+        }
+
+        return -1;
+    }
+
+    [DllImport("kernel32.dll", SetLastError = true)]
+    private static extern bool GetFileInformationByHandle(
+        SafeFileHandle hFile,
+        out BY_HANDLE_FILE_INFORMATION lpFileInformation
+    );
+
+    private struct BY_HANDLE_FILE_INFORMATION
+    {
+        public uint FileAttributes;
+        public System.Runtime.InteropServices.ComTypes.FILETIME CreationTime;
+        public System.Runtime.InteropServices.ComTypes.FILETIME LastAccessTime;
+        public System.Runtime.InteropServices.ComTypes.FILETIME LastWriteTime;
+        public uint VolumeSerialNumber;
+        public uint FileSizeHigh;
+        public uint FileSizeLow;
+        public uint NumberOfLinks;
+        public uint FileIndexHigh;
+        public uint FileIndexLow;
+    }
+}