| // 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; |
| } |
| } |
| } |