Speed up decompression

MareSynchronos/FileCache/FileCompactor.cs

@@ -90,6 +90,26 @@ public sealed class FileCompactor
         CompactFile(filePath);
     }
 
+    public void RenameAndCompact(string filePath, string originalFilePath)
+    {
+        try
+        {
+            File.Move(originalFilePath, filePath);
+        }
+        catch (IOException)
+        {
+            // File already exists
+            return;
+        }
+
+        if (_dalamudUtilService.IsWine || !_mareConfigService.Current.UseCompactor)
+        {
+            return;
+        }
+
+        CompactFile(filePath);
+    }
+
     [DllImport("kernel32.dll")]
     private static extern int DeviceIoControl(IntPtr hDevice, uint dwIoControlCode, IntPtr lpInBuffer, uint nInBufferSize, IntPtr lpOutBuffer, uint nOutBufferSize, out IntPtr lpBytesReturned, out IntPtr lpOverlapped);
 

MareSynchronos/WebAPI/Files/FileDownloadManager.cs

@@ -305,6 +305,8 @@ public partial class FileDownloadManager : DisposableMediatorSubscriberBase
             }
 
             FileStream? fileBlockStream = null;
+            var threadCount = Math.Clamp((int)(Environment.ProcessorCount / 2.0f), 2, 8);
+            var tasks = new List<Task>();
             try
             {
                 if (_downloadStatus.TryGetValue(fileGroup.Key, out var status))
@@ -316,28 +318,49 @@ public partial class FileDownloadManager : DisposableMediatorSubscriberBase
                 while (fileBlockStream.Position < fileBlockStream.Length)
                 {
                     (string fileHash, long fileLengthBytes) = ReadBlockFileHeader(fileBlockStream);
+                    var chunkPosition = fileBlockStream.Position;
+                    fileBlockStream.Position += fileLengthBytes;
+
+                    while (tasks.Count > threadCount && tasks.Where(t => !t.IsCompleted).Count() > 4)
+                        await Task.Delay(10, CancellationToken.None);
 
-                    try
-                    {
                     var fileExtension = fileReplacement.First(f => string.Equals(f.Hash, fileHash, StringComparison.OrdinalIgnoreCase)).GamePaths[0].Split(".")[^1];
+                    var tmpPath = _fileDbManager.GetCacheFilePath(Guid.NewGuid().ToString(), "tmp");
                     var filePath = _fileDbManager.GetCacheFilePath(fileHash, fileExtension);
+
                     Logger.LogDebug("{dlName}: Decompressing {file}:{le} => {dest}", fi.Name, fileHash, fileLengthBytes, filePath);
 
-                        using var decompressedFile = new MemoryStream(64 * 1024);
+                    tasks.Add(Task.Run(() => {
-                        using var innerFileStream = new LimitedStream(fileBlockStream, fileLengthBytes);
+                        try
-                        innerFileStream.DisposeUnderlying = false;
+                        {
-                        using var decStream = LZ4Stream.Decode(innerFileStream, 0, true);
+                            using var tmpFileStream = new FileStream(tmpPath, new FileStreamOptions()
-                        long startPos = fileBlockStream.Position;
+                            {
-                        await decStream.CopyToAsync(decompressedFile, CancellationToken.None).ConfigureAwait(false);
+                                Mode = FileMode.CreateNew,
-                        long readBytes = fileBlockStream.Position - startPos;
+                                Access = FileAccess.Write,
+                                Share = FileShare.None
+                            });
+
+                            using var fileChunkStream = new FileStream(blockFile, new FileStreamOptions()
+                            {
+                                BufferSize = 80000,
+                                Mode = FileMode.Open,
+                                Access = FileAccess.Read
+                            });
+                            fileChunkStream.Position = chunkPosition;
+
+                            using var innerFileStream = new LimitedStream(fileChunkStream, fileLengthBytes);
+                            using var decoder = LZ4Frame.Decode(innerFileStream);
+                            long startPos = fileChunkStream.Position;
+                            decoder.AsStream().CopyTo(tmpFileStream);
+                            long readBytes = fileChunkStream.Position - startPos;
 
                             if (readBytes != fileLengthBytes)
                             {
                                 throw new EndOfStreamException();
                             }
 
-                        await _fileCompactor.WriteAllBytesAsync(filePath, decompressedFile.ToArray(), CancellationToken.None).ConfigureAwait(false);
+                            tmpFileStream.Close();
-
+                            _fileCompactor.RenameAndCompact(filePath, tmpPath);
                             PersistFileToStorage(fileHash, filePath, fileLengthBytes);
                         }
                         catch (EndOfStreamException)
@@ -351,7 +374,15 @@ public partial class FileDownloadManager : DisposableMediatorSubscriberBase
                             foreach (var fr in fileReplacement)
                                 Logger.LogWarning(" - {h}: {x}", fr.Hash, fr.GamePaths[0]);
                         }
+                        finally
+                        {
+                            if (File.Exists(tmpPath))
+                                File.Delete(tmpPath);
                         }
+                    }));
+                }
+
+                Task.WaitAll([..tasks], CancellationToken.None);
             }
             catch (EndOfStreamException)
             {
@@ -363,6 +394,7 @@ public partial class FileDownloadManager : DisposableMediatorSubscriberBase
             }
             finally
             {
+                Task.WaitAll([..tasks], CancellationToken.None);
                 _orchestrator.ReleaseDownloadSlot();
                 if (fileBlockStream != null)
                     await fileBlockStream.DisposeAsync().ConfigureAwait(false);
@@ -384,18 +416,6 @@ public partial class FileDownloadManager : DisposableMediatorSubscriberBase
 
     private void PersistFileToStorage(string fileHash, string filePath, long? compressedSize = null)
     {
-        var fi = new FileInfo(filePath);
-        Func<DateTime> RandomDayInThePast()
-        {
-            DateTime start = new(1995, 1, 1, 1, 1, 1, DateTimeKind.Local);
-            Random gen = new();
-            int range = (DateTime.Today - start).Days;
-            return () => start.AddDays(gen.Next(range));
-        }
-
-        fi.CreationTime = RandomDayInThePast().Invoke();
-        fi.LastAccessTime = DateTime.Today;
-        fi.LastWriteTime = RandomDayInThePast().Invoke();
         try
         {
             var entry = _fileDbManager.CreateCacheEntry(filePath);
@@ -404,6 +424,7 @@ public partial class FileDownloadManager : DisposableMediatorSubscriberBase
                 Logger.LogError("Hash mismatch after extracting, got {hash}, expected {expectedHash}, deleting file", entry.Hash, fileHash);
                 File.Delete(filePath);
                 _fileDbManager.RemoveHashedFile(entry.Hash, entry.PrefixedFilePath);
+                entry = null;
             }
             if (entry != null)
                 entry.CompressedSize = compressedSize;