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reimplment ReadAsync for BlockFileDataStream/SubStream

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This commit is contained in:
Stanley Dimant
2024-11-04 11:51:13 +01:00
parent 7acd36bb79
commit c80848fa2e
5 changed files with 128 additions and 77 deletions
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80
MareSynchronosServer/MareSynchronosStaticFilesServer/Utils/BlockFileDataStream.cs
View File

@@ -1,11 +1,12 @@
namespace MareSynchronosStaticFilesServer.Utils;

namespace MareSynchronosStaticFilesServer.Utils;
public sealed class BlockFileDataStream : Stream
{
private readonly List<BlockFileDataSubstream> _substreams;
private readonly IEnumerable<BlockFileDataSubstream> _substreams;
private int _currentStreamIndex = 0;
public BlockFileDataStream(List<BlockFileDataSubstream> substreams)
public BlockFileDataStream(IEnumerable<BlockFileDataSubstream> substreams)
{
_substreams = substreams;
}
@@ -16,17 +17,17 @@ public sealed class BlockFileDataStream : Stream
public override long Length => throw new NotSupportedException();
public override long Position { get => throw new NotSupportedException(); set => throw new NotSupportedException(); }
public override int Read(byte[] buffer, int offset, int count)
public override async Task<int> ReadAsync(byte[] buffer, int offset, int count, CancellationToken cancellationToken)
{
int totalRead = 0;
int currentOffset = 0;
int remainingCount = count;
while (totalRead < count && _currentStreamIndex < _substreams.Count)
while (totalRead < count && _currentStreamIndex < _substreams.Count())
{
var lastReadBytes = _substreams[_currentStreamIndex].Read(buffer, currentOffset, remainingCount);
var lastReadBytes = await _substreams.ElementAt(_currentStreamIndex).ReadAsync(buffer, currentOffset, remainingCount, cancellationToken).ConfigureAwait(false);
if (lastReadBytes < remainingCount)
{
_substreams[_currentStreamIndex].Dispose();
_substreams.ElementAt(_currentStreamIndex).Dispose();
_currentStreamIndex++;
}
@@ -38,6 +39,51 @@ public sealed class BlockFileDataStream : Stream
return totalRead;
}
public override int Read(byte[] buffer, int offset, int count)
{
int totalRead = 0;
int currentOffset = 0;
int remainingCount = count;
while (totalRead < count && _currentStreamIndex < _substreams.Count())
{
var lastReadBytes = _substreams.ElementAt(_currentStreamIndex).Read(buffer, currentOffset, remainingCount);
if (lastReadBytes < remainingCount)
{
_substreams.ElementAt(_currentStreamIndex).Dispose();
_currentStreamIndex++;
}
totalRead += lastReadBytes;
currentOffset += lastReadBytes;
remainingCount -= lastReadBytes;
}
return totalRead;
}
public override async ValueTask<int> ReadAsync(Memory<byte> buffer, CancellationToken cancellationToken = default)
{
int totalRead = 0;
while (totalRead < buffer.Length && _currentStreamIndex < _substreams.Count())
{
var substream = _substreams.ElementAt(_currentStreamIndex);
int bytesRead = await substream.ReadAsync(buffer.Slice(totalRead), cancellationToken).ConfigureAwait(false);
if (bytesRead == 0)
{
substream.Dispose();
_currentStreamIndex++;
}
else
{
totalRead += bytesRead;
}
}
return totalRead;
}
protected override void Dispose(bool disposing)
{
if (disposing)
@@ -52,23 +98,11 @@ public sealed class BlockFileDataStream : Stream
base.Dispose(disposing);
}
public override void Flush()
{
throw new NotSupportedException();
}
public override void Flush() => throw new NotSupportedException();
public override long Seek(long offset, SeekOrigin origin)
{
throw new NotSupportedException();
}
public override long Seek(long offset, SeekOrigin origin) => throw new NotSupportedException();
public override void SetLength(long value)
{
throw new NotSupportedException();
}
public override void SetLength(long value) => throw new NotSupportedException();
public override void Write(byte[] buffer, int offset, int count)
{
throw new NotSupportedException();
}
public override void Write(byte[] buffer, int offset, int count) => throw new NotSupportedException();
}

105
MareSynchronosServer/MareSynchronosStaticFilesServer/Utils/BlockFileDataSubstream.cs
View File

@@ -6,70 +6,87 @@ namespace MareSynchronosStaticFilesServer.Utils;
public sealed class BlockFileDataSubstream : IDisposable
{
private readonly MemoryStream _headerStream;
private readonly BinaryWriter _headerStreamWriter;
private readonly FileStream _dataStream;
private int _headerPosition = 0;
private long _dataPosition = 0;
private bool _disposed = false;
private readonly Lazy<FileStream> _dataStreamLazy;
private FileStream DataStream => _dataStreamLazy.Value;
private long RemainingHeaderLength => _headerStream.Length - _headerPosition;
private long RemainingDataLength => _dataStream.Length - _dataPosition;
public BlockFileDataSubstream(FileStream dataStream)
public BlockFileDataSubstream(FileInfo file)
{
_headerStream = new MemoryStream();
_headerStreamWriter = new BinaryWriter(_headerStream);
_headerStreamWriter.Write(Encoding.ASCII.GetBytes("#" + new FileInfo(dataStream.Name).Name + ":" + dataStream.Length.ToString(CultureInfo.InvariantCulture) + "#"));
_headerStreamWriter.Flush();
_headerStream.Position = 0;
_dataStream = dataStream;
_dataStreamLazy = new(() => File.Open(file.FullName, FileMode.Open, FileAccess.Read, FileShare.Read | FileShare.Inheritable));
_headerStream = new MemoryStream(Encoding.ASCII.GetBytes("#" + file.Name + ":" + file.Length.ToString(CultureInfo.InvariantCulture) + "#"));
}
public int Read(byte[] inputBuffer, int offset, int count)
{
int currentOffset = offset;
int currentCount = count;
int readHeaderBytes = 0;
int bytesRead = 0;
if (RemainingHeaderLength > 0)
// Read from header stream if it has remaining data
if (_headerStream.Position < _headerStream.Length)
{
bool readOnlyHeader = currentCount <= RemainingHeaderLength;
byte[] readHeaderBuffer = new byte[Math.Min(currentCount, RemainingHeaderLength)];
readHeaderBytes = _headerStream.Read(readHeaderBuffer, 0, readHeaderBuffer.Length);
_headerPosition += readHeaderBytes;
Buffer.BlockCopy(readHeaderBuffer, 0, inputBuffer, currentOffset, readHeaderBytes);
if (readOnlyHeader)
{
return readHeaderBytes;
}
currentOffset += readHeaderBytes;
currentCount -= readHeaderBytes;
int headerBytesToRead = (int)Math.Min(count, _headerStream.Length - _headerStream.Position);
bytesRead += _headerStream.Read(inputBuffer, offset, headerBytesToRead);
offset += bytesRead;
count -= bytesRead;
}
if (RemainingDataLength > 0)
// Read from data stream if there is still space in buffer
if (count > 0 && DataStream.Position < DataStream.Length)
{
byte[] readDataBuffer = new byte[currentCount];
var readDataBytes = _dataStream.Read(readDataBuffer, 0, readDataBuffer.Length);
_dataPosition += readDataBytes;
Buffer.BlockCopy(readDataBuffer, 0, inputBuffer, currentOffset, readDataBytes);
return readDataBytes + readHeaderBytes;
bytesRead += DataStream.Read(inputBuffer, offset, count);
}
return 0;
return bytesRead;
}
public async Task<int> ReadAsync(byte[] inputBuffer, int offset, int count, CancellationToken cancellationToken = default)
{
int bytesRead = 0;
// Async read from header stream
if (_headerStream.Position < _headerStream.Length)
{
int headerBytesToRead = (int)Math.Min(count, _headerStream.Length - _headerStream.Position);
bytesRead += await _headerStream.ReadAsync(inputBuffer.AsMemory(offset, headerBytesToRead), cancellationToken).ConfigureAwait(false);
offset += bytesRead;
count -= bytesRead;
}
// Async read from data stream
if (count > 0 && DataStream.Position < DataStream.Length)
{
bytesRead += await DataStream.ReadAsync(inputBuffer.AsMemory(offset, count), cancellationToken).ConfigureAwait(false);
}
return bytesRead;
}
public async ValueTask<int> ReadAsync(Memory<byte> buffer, CancellationToken cancellationToken = default)
{
int bytesRead = 0;
// Async read from header stream
if (_headerStream.Position < _headerStream.Length)
{
int headerBytesToRead = (int)Math.Min(buffer.Length, _headerStream.Length - _headerStream.Position);
bytesRead += await _headerStream.ReadAsync(buffer.Slice(0, headerBytesToRead), cancellationToken).ConfigureAwait(false);
buffer = buffer.Slice(headerBytesToRead);
}
// Async read from data stream
if (buffer.Length > 0 && DataStream.Position < DataStream.Length)
{
bytesRead += await DataStream.ReadAsync(buffer, cancellationToken).ConfigureAwait(false);
}
return bytesRead;
}
public void Dispose()
{
if (_disposed) return;
_headerStream.Dispose();
_headerStreamWriter.Dispose();
_dataStream.Dispose();
if (_dataStreamLazy.IsValueCreated)
DataStream.Dispose();
_disposed = true;
}
}