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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.Collections.Generic;
using System.Diagnostics;
using System.Text;
namespace Thrift.Transport
{
abstract public class TEndpointTransport : TTransport
{
protected long MaxMessageSize { get => Configuration.MaxMessageSize; }
protected long KnownMessageSize { get; private set; }
protected long RemainingMessageSize { get; private set; }
private readonly TConfiguration _configuration;
public override TConfiguration Configuration { get => _configuration; }
public TEndpointTransport( TConfiguration config)
{
_configuration = config ?? new TConfiguration();
Debug.Assert(Configuration != null);
ResetConsumedMessageSize();
}
/// <summary>
/// Resets RemainingMessageSize to the configured maximum
/// </summary>
protected void ResetConsumedMessageSize(long newSize = -1)
{
// full reset
if (newSize < 0)
{
KnownMessageSize = MaxMessageSize;
RemainingMessageSize = MaxMessageSize;
return;
}
// update only: message size can shrink, but not grow
Debug.Assert(KnownMessageSize <= MaxMessageSize);
if (newSize > KnownMessageSize)
throw new TTransportException(TTransportException.ExceptionType.EndOfFile, "MaxMessageSize reached");
KnownMessageSize = newSize;
RemainingMessageSize = newSize;
}
/// <summary>
/// Updates RemainingMessageSize to reflect then known real message size (e.g. framed transport).
/// Will throw if we already consumed too many bytes or if the new size is larger than allowed.
/// </summary>
/// <param name="size"></param>
public override void UpdateKnownMessageSize(long size)
{
var consumed = KnownMessageSize - RemainingMessageSize;
ResetConsumedMessageSize(size);
CountConsumedMessageBytes(consumed);
}
/// <summary>
/// Throws if there are not enough bytes in the input stream to satisfy a read of numBytes bytes of data
/// </summary>
/// <param name="numBytes"></param>
public override void CheckReadBytesAvailable(long numBytes)
{
if (RemainingMessageSize < numBytes)
throw new TTransportException(TTransportException.ExceptionType.EndOfFile, "MaxMessageSize reached");
}
/// <summary>
/// Consumes numBytes from the RemainingMessageSize.
/// </summary>
/// <param name="numBytes"></param>
protected void CountConsumedMessageBytes(long numBytes)
{
if (RemainingMessageSize >= numBytes)
{
RemainingMessageSize -= numBytes;
}
else
{
RemainingMessageSize = 0;
throw new TTransportException(TTransportException.ExceptionType.EndOfFile, "MaxMessageSize reached");
}
}
}
}
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