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// Licensed to the Apache Software Foundation(ASF) under one
// or more contributor license agreements.See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
using System;
using System.IO;
using System.Threading;
using System.Threading.Tasks;
namespace Thrift.Transports.Client
{
//TODO: check for correct implementation
// ReSharper disable once InconsistentNaming
public class TFramedClientTransport : TClientTransport
{
private const int HeaderSize = 4;
private readonly byte[] _headerBuf = new byte[HeaderSize];
private readonly MemoryStream _readBuffer = new MemoryStream(1024);
private readonly TClientTransport _transport;
private readonly MemoryStream _writeBuffer = new MemoryStream(1024);
private bool _isDisposed;
public TFramedClientTransport(TClientTransport transport)
{
_transport = transport ?? throw new ArgumentNullException(nameof(transport));
InitWriteBuffer();
}
public override bool IsOpen => !_isDisposed && _transport.IsOpen;
public override async Task OpenAsync(CancellationToken cancellationToken)
{
CheckNotDisposed();
await _transport.OpenAsync(cancellationToken);
}
public override void Close()
{
CheckNotDisposed();
_transport.Close();
}
public override async Task<int> ReadAsync(byte[] buffer, int offset, int length,
CancellationToken cancellationToken)
{
CheckNotDisposed();
ValidateBufferArgs(buffer, offset, length);
if (!IsOpen)
{
throw new TTransportException(TTransportException.ExceptionType.NotOpen);
}
var got = await _readBuffer.ReadAsync(buffer, offset, length, cancellationToken);
if (got > 0)
{
return got;
}
// Read another frame of data
await ReadFrameAsync(cancellationToken);
return await _readBuffer.ReadAsync(buffer, offset, length, cancellationToken);
}
private async Task ReadFrameAsync(CancellationToken cancellationToken)
{
await _transport.ReadAllAsync(_headerBuf, 0, HeaderSize, cancellationToken);
var size = DecodeFrameSize(_headerBuf);
_readBuffer.SetLength(size);
_readBuffer.Seek(0, SeekOrigin.Begin);
ArraySegment<byte> bufSegment;
_readBuffer.TryGetBuffer(out bufSegment);
var buff = bufSegment.Array;
await _transport.ReadAllAsync(buff, 0, size, cancellationToken);
}
public override async Task WriteAsync(byte[] buffer, int offset, int length, CancellationToken cancellationToken)
{
CheckNotDisposed();
ValidateBufferArgs(buffer, offset, length);
if (!IsOpen)
{
throw new TTransportException(TTransportException.ExceptionType.NotOpen);
}
if (_writeBuffer.Length + length > int.MaxValue)
{
await FlushAsync(cancellationToken);
}
await _writeBuffer.WriteAsync(buffer, offset, length, cancellationToken);
}
public override async Task FlushAsync(CancellationToken cancellationToken)
{
CheckNotDisposed();
if (!IsOpen)
{
throw new TTransportException(TTransportException.ExceptionType.NotOpen);
}
//ArraySegment<byte> bufSegment;
//_writeBuffer.TryGetBuffer(out bufSegment);
//var buf = bufSegment.Array;
var buf = _writeBuffer.ToArray();
//var len = (int)_writeBuffer.Length;
var dataLen = (int) _writeBuffer.Length - HeaderSize;
if (dataLen < 0)
{
throw new InvalidOperationException(); // logic error actually
}
// Inject message header into the reserved buffer space
EncodeFrameSize(dataLen, buf);
// Send the entire message at once
await _transport.WriteAsync(buf, cancellationToken);
InitWriteBuffer();
await _transport.FlushAsync(cancellationToken);
}
private void InitWriteBuffer()
{
// Reserve space for message header to be put right before sending it out
_writeBuffer.SetLength(HeaderSize);
_writeBuffer.Seek(0, SeekOrigin.End);
}
private static void EncodeFrameSize(int frameSize, byte[] buf)
{
buf[0] = (byte) (0xff & (frameSize >> 24));
buf[1] = (byte) (0xff & (frameSize >> 16));
buf[2] = (byte) (0xff & (frameSize >> 8));
buf[3] = (byte) (0xff & (frameSize));
}
private static int DecodeFrameSize(byte[] buf)
{
return
((buf[0] & 0xff) << 24) |
((buf[1] & 0xff) << 16) |
((buf[2] & 0xff) << 8) |
(buf[3] & 0xff);
}
private void CheckNotDisposed()
{
if (_isDisposed)
{
throw new ObjectDisposedException("TFramedClientTransport");
}
}
// IDisposable
protected override void Dispose(bool disposing)
{
if (!_isDisposed)
{
if (disposing)
{
_readBuffer?.Dispose();
_writeBuffer?.Dispose();
_transport?.Dispose();
}
}
_isDisposed = true;
}
}
}
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