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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.Diagnostics;
using System.IO;
using System.Threading;
using System.Threading.Tasks;
namespace Thrift.Transport
{
//TODO: think about client info
// ReSharper disable once InconsistentNaming
public abstract class TTransport : IDisposable
{
//TODO: think how to avoid peek byte
private readonly byte[] _peekBuffer = new byte[1];
private bool _hasPeekByte;
public abstract bool IsOpen { get; }
public abstract TConfiguration Configuration { get; }
public abstract void UpdateKnownMessageSize(long size);
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
public async ValueTask<bool> PeekAsync(CancellationToken cancellationToken)
{
//If we already have a byte read but not consumed, do nothing.
if (_hasPeekByte)
{
return true;
}
//If transport closed we can't peek.
if (!IsOpen)
{
return false;
}
//Try to read one byte. If succeeds we will need to store it for the next read.
try
{
var bytes = await ReadAsync(_peekBuffer, 0, 1, cancellationToken);
if (bytes == 0)
{
return false;
}
}
catch (IOException)
{
return false;
}
_hasPeekByte = true;
return true;
}
public virtual async Task OpenAsync()
{
await OpenAsync(CancellationToken.None);
}
public abstract Task OpenAsync(CancellationToken cancellationToken);
public abstract void Close();
protected static void ValidateBufferArgs(byte[] buffer, int offset, int length)
{
if (buffer == null)
{
throw new ArgumentNullException(nameof(buffer));
}
#if DEBUG // let it fail with OutOfRange in RELEASE mode
if (offset < 0)
{
throw new ArgumentOutOfRangeException(nameof(offset), "Buffer offset must be >= 0");
}
if (length < 0)
{
throw new ArgumentOutOfRangeException(nameof(length), "Buffer length must be >= 0");
}
if (offset + length > buffer.Length)
{
throw new ArgumentOutOfRangeException(nameof(buffer), "Not enough data");
}
#endif
}
public virtual async ValueTask<int> ReadAsync(byte[] buffer, int offset, int length)
{
return await ReadAsync(buffer, offset, length, CancellationToken.None);
}
public abstract ValueTask<int> ReadAsync(byte[] buffer, int offset, int length, CancellationToken cancellationToken);
public virtual async ValueTask<int> ReadAllAsync(byte[] buffer, int offset, int length)
{
return await ReadAllAsync(buffer, offset, length, CancellationToken.None);
}
public virtual async ValueTask<int> ReadAllAsync(byte[] buffer, int offset, int length, CancellationToken cancellationToken)
{
ValidateBufferArgs(buffer, offset, length);
if (cancellationToken.IsCancellationRequested)
return await Task.FromCanceled<int>(cancellationToken);
if (length <= 0)
return 0;
// If we previously peeked a byte, we need to use that first.
var totalBytes = 0;
if (_hasPeekByte)
{
buffer[offset++] = _peekBuffer[0];
_hasPeekByte = false;
if (1 == length)
{
return 1; // we're done
}
++totalBytes;
}
var remaining = length - totalBytes;
Debug.Assert(remaining > 0); // any other possible cases should have been handled already
while (true)
{
var numBytes = await ReadAsync(buffer, offset, remaining, cancellationToken);
totalBytes += numBytes;
if (totalBytes >= length)
{
return totalBytes; // we're done
}
if (numBytes <= 0)
{
throw new TTransportException(TTransportException.ExceptionType.EndOfFile,
"Cannot read, Remote side has closed");
}
remaining -= numBytes;
offset += numBytes;
}
}
public virtual async Task WriteAsync(byte[] buffer)
{
await WriteAsync(buffer, CancellationToken.None);
}
public virtual async Task WriteAsync(byte[] buffer, CancellationToken cancellationToken)
{
await WriteAsync(buffer, 0, buffer.Length, CancellationToken.None);
}
public virtual async Task WriteAsync(byte[] buffer, int offset, int length)
{
await WriteAsync(buffer, offset, length, CancellationToken.None);
}
public abstract Task WriteAsync(byte[] buffer, int offset, int length, CancellationToken cancellationToken);
public virtual async Task FlushAsync()
{
await FlushAsync(CancellationToken.None);
}
public abstract Task FlushAsync(CancellationToken cancellationToken);
protected abstract void Dispose(bool disposing);
}
}
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