public ReusableTask <int> ReadAsync(ITorrentManagerFile file, long offset, Memory <byte> buffer)
{
if (DoNotReadFrom.Contains(file))
{
return(ReusableTask.FromResult(0));
}
if (!Paths.Contains(file.FullPath))
{
Paths.Add(file.FullPath);
}
if ((offset + buffer.Length) > file.Length)
{
throw new ArgumentOutOfRangeException("Tried to read past the end of the file");
}
if (!DontWrite)
{
for (int i = 0; i < buffer.Length; i++)
{
buffer.Span[i] = (byte)i;
}
}
return(ReusableTask.FromResult(buffer.Length));
}
public async ReusableTask WriteAsync(ITorrentManagerFile file, long offset, ReadOnlyMemory <byte> buffer)
{
if (file is null)
{
throw new ArgumentNullException(nameof(file));
}
if (offset < 0 || offset + buffer.Length > file.Length)
{
throw new ArgumentOutOfRangeException(nameof(offset));
}
using (await Limiter.EnterAsync()) {
using var rented = await StreamCache.GetOrCreateStreamAsync(file, FileAccess.ReadWrite).ConfigureAwait(false);
// FileStream.WriteAsync does some work synchronously, according to the profiler.
// It looks like if the file is too small it is expanded (SetLength is called)
// synchronously before the asynchronous Write is performed.
//
// We also want the Seek operation to execute on the threadpool.
await SwitchToThreadpool();
rented.Stream !.Seek(offset, SeekOrigin.Begin);
rented.Stream.Write(buffer);
}
}
public async ReusableTask <int> ReadAsync(ITorrentManagerFile file, long offset, Memory <byte> buffer)
{
if (file is null)
{
throw new ArgumentNullException(nameof(file));
}
if (offset < 0 || offset + buffer.Length > file.Length)
{
throw new ArgumentOutOfRangeException(nameof(offset));
}
using (await Limiter.EnterAsync()) {
using var rented = await StreamCache.GetOrCreateStreamAsync(file, FileAccess.Read).ConfigureAwait(false);
await SwitchToThreadpool();
if (rented.Stream !.Length < offset + buffer.Length)
{
return(0);
}
if (rented.Stream.Position != offset)
{
rented.Stream.Seek(offset, SeekOrigin.Begin);
}
return(rented.Stream.Read(buffer));
}
}
public override async ReusableTask WriteAsync(ITorrentManagerFile file, long offset, ReadOnlyMemory <byte> buffer)
{
var tcs = new ReusableTaskCompletionSource <object> ();
Writes.Add(tcs);
await tcs.Task;
}
public ReusableTask <int> ReadAsync(ITorrentManagerFile file, long offset, Memory <byte> buffer)
{
if (read)
{
throw new Exception("read");
}
return(ReusableTask.FromResult(buffer.Length));
}
public ReusableTask MoveAsync(ITorrentManagerFile file, string newPath, bool overwrite)
{
if (move)
{
throw new Exception("move");
}
return(ReusableTask.CompletedTask);
}
public ReusableTask <bool> ExistsAsync(ITorrentManagerFile file)
{
if (exist)
{
throw new Exception("exists");
}
return(ReusableTask.FromResult(true));
}
public ReusableTask WriteAsync(ITorrentManagerFile file, long offset, ReadOnlyMemory <byte> buffer)
{
if (write)
{
throw new Exception("write");
}
return(ReusableTask.CompletedTask);
}
public ReusableTask CloseAsync(ITorrentManagerFile file)
{
if (close)
{
throw new Exception("close");
}
return(ReusableTask.CompletedTask);
}
public ReusableTask WriteAsync(ITorrentManagerFile file, long offset, ReadOnlyMemory <byte> buffer)
{
var result = new byte[buffer.Length];
buffer.CopyTo(result.AsMemory());
WrittenData.Add(Tuple.Create(file, offset, result));
return(ReusableTask.CompletedTask);
}
/// <summary>
/// Creates a <see cref="Stream"/> which can be used to access the given <see cref="TorrentFile"/>
/// while it is downloading. This stream is seekable and readable. This stream must be disposed
/// before another stream can be created.
/// </summary>
/// <param name="file">The file to open</param>
/// <param name="prebuffer">True if the first and last piece should be downloaded before the Stream is created.</param>
/// <param name="token">The cancellation token</param>
/// <returns></returns>
public async Task <IUriStream> CreateHttpStreamAsync(ITorrentManagerFile file, bool prebuffer, CancellationToken token)
{
var stream = await CreateStreamAsync(file, prebuffer, token);
var httpStreamer = new HttpStream(stream);
return(httpStreamer);
}
public ReusableTask FlushAsync(ITorrentManagerFile file)
{
if (flush)
{
throw new Exception("flush");
}
FlushedFiles.Add(file);
return(ReusableTask.CompletedTask);
}
internal async ReusableTask FlushAsync(ITorrentManagerFile file)
{
using var rented = await GetStream(file);
if (rented.Stream != null)
{
await rented.Stream.FlushAsync();
}
}
public async ReusableTask MoveAsync(ITorrentManagerFile file, string newPath, bool overwrite)
{
await StreamCache.CloseStreamAsync(file);
if (overwrite)
{
File.Delete(newPath);
}
if (File.Exists(file.FullPath))
{
Directory.CreateDirectory(Path.GetDirectoryName(newPath) !);
File.Move(file.FullPath, newPath);
}
}
internal async ReusableTask <RentedStream> GetOrCreateStreamAsync(ITorrentManagerFile file, FileAccess access)
{
if (!Streams.TryGetValue(file, out StreamData? data))
{
data = Streams[file] = new StreamData();
}
var releaser = await data.Locker.EnterAsync();
if (data.Stream != null)
{
// If we are requesting write access and the current stream does not have it
if (((access & FileAccess.Write) == FileAccess.Write) && !data.Stream.CanWrite)
{
data.Stream.Dispose();
data.Stream = null;
Count--;
}
}
if (data.Stream == null)
{
if (!File.Exists(file.FullPath))
{
if (Path.GetDirectoryName(file.FullPath) is string parentDirectory)
{
Directory.CreateDirectory(parentDirectory);
}
NtfsSparseFile.CreateSparse(file.FullPath, file.Length);
}
data.Stream = StreamCreator(file, access);
Count++;
// Ensure that we truncate existing files which are too large
if (data.Stream.Length > file.Length)
{
if (!data.Stream.CanWrite)
{
data.Stream.Dispose();
data.Stream = StreamCreator(file, FileAccess.ReadWrite);
}
data.Stream.SetLength(file.Length);
}
}
data.LastUsedStamp = Stopwatch.GetTimestamp();
MaybeRemoveOldestStream();
return(new RentedStream(data.Stream, releaser));
}
public void Setup()
{
var pieceLength = Constants.BlockSize * 2;
Temp = Path.GetTempPath() + "monotorrent_tests";
var files = TorrentFileInfo.Create(pieceLength,
("test1.file", 12345, Path.Combine(Temp, "test1.file")),
("test2.file", 12345, Path.Combine(Temp, "test2.file")),
("test3.file", 12345, Path.Combine(Temp, "test3.file")),
("test4.file", 12345, Path.Combine(Temp, "test4.file"))
);
TorrentFile = files.First();
Others = files.Skip(1).ToArray();
}
internal async ReusableTask <bool> CloseStreamAsync(ITorrentManagerFile file)
{
if (Streams.TryGetValue(file, out StreamData? data))
{
using var releaser = await data.Locker.EnterAsync();
if (data.Stream != null)
{
data.Stream.Dispose();
data.Stream = null;
Count--;
return(true);
}
}
return(false);
}
internal async ReusableTask <RentedStream> GetStream(ITorrentManagerFile file)
{
if (Streams.TryGetValue(file, out StreamData? data))
{
var releaser = await data.Locker.EnterAsync();
if (data.Stream == null)
{
releaser.Dispose();
}
else
{
data.LastUsedStamp = Stopwatch.GetTimestamp();
return(new RentedStream(data.Stream, releaser));
}
}
return(new RentedStream(null, default));
}
public ReusableTask <int> ReadAsync(ITorrentManagerFile file, long offset, Memory <byte> buffer)
{
ReadData.Add(Tuple.Create(file, offset, buffer.Length));
if (Data == null)
{
var fileData = WrittenData
.Where(t => t.Item1 == file)
.OrderBy(t => t.Item2)
.SelectMany(t => t.Item3)
.ToArray();
fileData.AsSpan((int)offset, buffer.Length).CopyTo(buffer.Span);
}
else
{
var data = Data[file];
data.AsSpan((int)offset, buffer.Length).CopyTo(buffer.Span);
}
return(ReusableTask.FromResult(buffer.Length));
}
public async Task SetFilePriorityAsync(ITorrentManagerFile file, Priority priority)
{
if (!Files.Contains(file))
{
throw new ArgumentNullException(nameof(file), "The file is not part of this torrent");
}
// No change
if (priority == file.Priority)
{
return;
}
await ClientEngine.MainLoop;
// If the old priority, or new priority, is 'DoNotDownload' then the selector needs to be refreshed
bool needsToUpdateSelector = file.Priority == Priority.DoNotDownload || priority == Priority.DoNotDownload;
((TorrentFileInfo)file).Priority = priority;
if (needsToUpdateSelector)
{
// If we change the priority of a file we need to figure out which files are marked
// as 'DoNotDownload' and which ones are downloadable.
PartialProgressSelector.SetAll(false);
if (Files.All(t => t.Priority != Priority.DoNotDownload))
{
PartialProgressSelector.SetAll(true);
}
else
{
PartialProgressSelector.SetAll(false);
foreach (var f in Files.Where(t => t.Priority != Priority.DoNotDownload))
{
PartialProgressSelector.SetTrue((f.StartPieceIndex, f.EndPieceIndex));
}
}
}
}
/// <summary>
/// Creates a <see cref="Stream"/> which can be used to access the given <see cref="TorrentFile"/>
/// while it is downloading. This stream is seekable and readable. The first and last pieces of
/// this file will be buffered before the stream is created if <paramref name="prebuffer"/> is
/// set to true. Finally, this stream must be disposed before another stream can be created.
/// </summary>
/// <param name="file">The file to open</param>
/// <param name="prebuffer">True if the first and last piece should be downloaded before the Stream is created.</param>
/// <param name="token">The cancellation token.</param>
/// <returns></returns>
public async Task <Stream> CreateStreamAsync(ITorrentManagerFile file, bool prebuffer, CancellationToken token)
{
if (file == null)
{
throw new ArgumentNullException(nameof(file));
}
if (Manager.Files == null)
{
throw new InvalidOperationException("The metadata for this torrent has not been downloaded. You must call WaitForMetadataAsync before creating a stream.");
}
if (Manager.State == TorrentState.Stopped || Manager.State == TorrentState.Stopping || Manager.State == TorrentState.Error)
{
throw new InvalidOperationException($"The torrent state was {Manager.State}. StreamProvider cannot be used unless the torrent manager has been successfully started.");
}
if (!Manager.Files.Contains(file))
{
throw new ArgumentException("The TorrentFile is not from this TorrentManager", nameof(file));
}
if (ActiveStream != null && !ActiveStream.Disposed)
{
throw new InvalidOperationException("You must Dispose the previous stream before creating a new one.");
}
ActiveStream = new LocalStream(Manager, file, PieceRequester);
var tcs = CancellationTokenSource.CreateLinkedTokenSource(Cancellation.Token, token);
if (prebuffer)
{
ActiveStream.Seek(ActiveStream.Length - Manager.Torrent !.PieceLength * 2, SeekOrigin.Begin);
await ActiveStream.ReadAsync(new byte[1], 0, 1, tcs.Token);
ActiveStream.Seek(0, SeekOrigin.Begin);
await ActiveStream.ReadAsync(new byte[1], 0, 1, tcs.Token);
}
ActiveStream.Seek(0, SeekOrigin.Begin);
return(ActiveStream);
}
public void Set(ITorrentManagerFile file, Priority priority) => ((TorrentFileInfo)file).Priority = priority;
public static long BytesDownloaded(this ITorrentManagerFile info) => (long)(info.BitField.PercentComplete * info.Length / 100.0);
internal async Task <bool> CheckFileExistsAsync(ITorrentManagerFile file)
{
await IOLoop;
return(await Cache.Writer.ExistsAsync(file).ConfigureAwait(false));
}
public ReusableTask CloseAsync(ITorrentManagerFile file)
{
return(ReusableTask.CompletedTask);
}
public ReusableTask WriteAsync(ITorrentManagerFile file, long offset, ReadOnlyMemory <byte> buffer)
{
return(ReusableTask.CompletedTask);
}
public ReusableTask MoveAsync(ITorrentManagerFile file, string newPath, bool overwrite)
{
return(ReusableTask.CompletedTask);
}
public ReusableTask <bool> ExistsAsync(ITorrentManagerFile file)
{
return(ReusableTask.FromResult(FilesThatExist.Contains(file)));
}
public ReusableTask <int> ReadAsync(ITorrentManagerFile file, long offset, Memory <byte> buffer)
{
return(ReusableTask.FromResult(0));
}
public Files(ITorrentManagerFile file)
{
Priority = file.Priority;
File = file;
}
