< Summary

Information
Class: IceRpc.Transports.Internal.DuplexConnectionReader
Assembly: IceRpc
File(s): /home/runner/work/icerpc-csharp/icerpc-csharp/src/IceRpc/Transports/Internal/DuplexConnectionReader.cs
Tag: 278_19370051549
Line coverage
82%
Covered lines: 91
Uncovered lines: 19
Coverable lines: 110
Total lines: 208
Line coverage: 82.7%
Branch coverage
76%
Covered branches: 32
Total branches: 42
Branch coverage: 76.1%
Method coverage
100%
Covered methods: 10
Total methods: 10
Method coverage: 100%

Metrics

MethodBranch coverage Crap Score Cyclomatic complexity Line coverage
Dispose()100%11100%
.ctor(...)100%11100%
AdvanceTo(...)100%11100%
AdvanceTo(...)100%11100%
FillBufferWriterAsync(...)83.33%1212100%
ReadFromConnectionAsync()87.5%10.37866.66%
ReadAsync(...)100%11100%
ReadAtLeastAsync(...)100%11100%
TryRead(...)66.66%66100%
ReadAsyncCore()68.75%22.211671.05%

File(s)

/home/runner/work/icerpc-csharp/icerpc-csharp/src/IceRpc/Transports/Internal/DuplexConnectionReader.cs

#LineLine coverage
 1// Copyright (c) ZeroC, Inc.
 2
 3using IceRpc.Internal;
 4using System.Buffers;
 5using System.Diagnostics;
 6using System.IO.Pipelines;
 7
 8namespace IceRpc.Transports.Internal;
 9
 10/// <summary>A helper class to efficiently read data from a duplex connection. It provides a PipeReader-like API but is
 11/// not a PipeReader. Like a PipeReader, its methods shouldn't be called concurrently.</summary>
 12internal class DuplexConnectionReader : IDisposable
 13{
 14    private readonly IDuplexConnection _connection;
 15    private readonly Pipe _pipe;
 16
 17    public void Dispose()
 179218    {
 179219        _pipe.Writer.Complete();
 179220        _pipe.Reader.Complete();
 179221    }
 22
 23    /// <summary>Constructs a duplex connection reader.</summary>
 24    /// <param name="connection">The duplex connection to reader from.</param>
 25    /// <param name="pool">The memory pool to use.</param>
 26    /// <param name="minimumSegmentSize">The minimum segment size for buffers allocated from <paramref name="pool"/>.
 27    /// </param>
 179428    internal DuplexConnectionReader(IDuplexConnection connection, MemoryPool<byte> pool, int minimumSegmentSize)
 179429    {
 179430        _connection = connection;
 31
 32        // The readerScheduler doesn't matter (we don't call _pipe.Reader.ReadAsync) and the writerScheduler doesn't
 33        // matter (_pipe.Writer.FlushAsync never blocks).
 179434        _pipe = new Pipe(new PipeOptions(
 179435            pool: pool,
 179436            minimumSegmentSize: minimumSegmentSize,
 179437            pauseWriterThreshold: 0,
 179438            useSynchronizationContext: false));
 179439    }
 40
 3527841    internal void AdvanceTo(SequencePosition consumed) => _pipe.Reader.AdvanceTo(consumed);
 42
 43    internal void AdvanceTo(SequencePosition consumed, SequencePosition examined) =>
 16144        _pipe.Reader.AdvanceTo(consumed, examined);
 45
 46    /// <summary>Writes <paramref name="byteCount" /> bytes read from this pipe reader or its underlying connection
 47    /// into <paramref name="bufferWriter" />.</summary>
 48    internal ValueTask FillBufferWriterAsync(
 49        IBufferWriter<byte> bufferWriter,
 50        int byteCount,
 51        CancellationToken cancellationToken)
 2456852    {
 2456853        if (byteCount == 0)
 103054        {
 103055            return default;
 56        }
 57
 58        // If there's still data on the pipe reader, copy the data from the pipe reader synchronously.
 2353859        if (_pipe.Reader.TryRead(out ReadResult readResult))
 2353860        {
 2353861            Debug.Assert(!readResult.IsCompleted && !readResult.IsCanceled && !readResult.Buffer.IsEmpty);
 62
 2353863            ReadOnlySequence<byte> buffer = readResult.Buffer;
 2353864            if (buffer.Length > byteCount)
 630665            {
 630666                buffer = buffer.Slice(0, byteCount);
 630667            }
 68
 2353869            bufferWriter.Write(buffer);
 2353870            _pipe.Reader.AdvanceTo(buffer.End);
 71
 2353872            byteCount -= (int)buffer.Length;
 73
 2353874            if (byteCount == 0)
 1138475            {
 1138476                return default;
 77            }
 1215478        }
 79
 1215480        return ReadFromConnectionAsync(byteCount);
 81
 82        // Read the remaining bytes directly from the connection into the buffer writer.
 83        async ValueTask ReadFromConnectionAsync(int byteCount)
 1215484        {
 85            try
 1215486            {
 87                do
 9540488                {
 9540489                    Memory<byte> buffer = bufferWriter.GetMemory();
 9540490                    if (buffer.Length > byteCount)
 217391                    {
 217392                        buffer = buffer[0..byteCount];
 217393                    }
 94
 9540495                    int read = await _connection.ReadAsync(buffer, cancellationToken).ConfigureAwait(false);
 9540296                    bufferWriter.Advance(read);
 9540297                    byteCount -= read;
 98
 9540299                    if (byteCount > 0 && read == 0)
 0100                    {
 101                        // The peer gracefully shut down the connection but returned less data than expected, it's
 102                        // considered as an error.
 0103                        throw new InvalidDataException("Received less data than expected.");
 104                    }
 95402105                }
 95402106                while (byteCount > 0);
 12152107            }
 0108            catch (ObjectDisposedException exception)
 0109            {
 0110                throw new IceRpcException(
 0111                    IceRpcError.OperationAborted,
 0112                    "The read operation was aborted by the disposal of the duplex connection.",
 0113                    exception);
 114            }
 12152115        }
 24568116    }
 117
 118    /// <summary>Reads and returns bytes from the underlying transport connection. The returned buffer can be empty if
 119    /// the peer shutdown its side of the connection.</summary>
 120    internal ValueTask<ReadOnlySequence<byte>> ReadAsync(CancellationToken cancellationToken = default) =>
 17925121        ReadAsyncCore(minimumSize: 1, canReturnEmptyBuffer: true, cancellationToken);
 122
 123    /// <summary>Reads and returns bytes from the underlying transport connection. The returned buffer has always
 124    /// at least minimumSize bytes.</summary>
 125    internal ValueTask<ReadOnlySequence<byte>> ReadAtLeastAsync(int minimumSize, CancellationToken cancellationToken = d
 9475126        ReadAsyncCore(minimumSize: minimumSize, canReturnEmptyBuffer: false, cancellationToken);
 127
 128    internal bool TryRead(out ReadOnlySequence<byte> buffer)
 27509129    {
 27509130        if (_pipe.Reader.TryRead(out ReadResult readResult))
 9584131        {
 9584132            Debug.Assert(!readResult.IsCompleted && !readResult.IsCanceled && !readResult.Buffer.IsEmpty);
 9584133            buffer = readResult.Buffer;
 9584134            return true;
 135        }
 136        else
 17925137        {
 17925138            buffer = default;
 17925139            return false;
 140        }
 27509141    }
 142
 143    /// <summary>Reads and returns bytes from the underlying transport connection. The returned buffer has always at
 144    /// least minimumSize bytes or if canReturnEmptyBuffer is true, the returned buffer can be empty if the peer
 145    /// shutdown the connection.</summary>
 146    private async ValueTask<ReadOnlySequence<byte>> ReadAsyncCore(
 147        int minimumSize,
 148        bool canReturnEmptyBuffer,
 149        CancellationToken cancellationToken = default)
 27400150    {
 27400151        Debug.Assert(minimumSize > 0);
 152
 153        // Read buffered data first.
 27400154        if (_pipe.Reader.TryRead(out ReadResult readResult))
 4710155        {
 4710156            Debug.Assert(!readResult.IsCompleted && !readResult.IsCanceled && !readResult.Buffer.IsEmpty);
 4710157            if (readResult.Buffer.Length >= minimumSize)
 4710158            {
 4710159                return readResult.Buffer;
 160            }
 0161            _pipe.Reader.AdvanceTo(readResult.Buffer.Start, readResult.Buffer.End);
 0162            minimumSize -= (int)readResult.Buffer.Length;
 0163        }
 164
 165        try
 22690166        {
 167            do
 22690168            {
 169                // Fill the pipe with data read from the connection.
 22690170                Memory<byte> buffer = _pipe.Writer.GetMemory();
 22690171                int read = await _connection.ReadAsync(buffer, cancellationToken).ConfigureAwait(false);
 172
 21432173                _pipe.Writer.Advance(read);
 21432174                minimumSize -= read;
 175
 176                // The peer shutdown its side of the connection, return an empty buffer if allowed.
 21432177                if (read == 0)
 265178                {
 265179                    if (canReturnEmptyBuffer)
 265180                    {
 265181                        break;
 182                    }
 183                    else
 0184                    {
 185                        // The connection was aborted or the peer gracefully shut down the connection but returned less
 186                        // data than expected.
 0187                        throw new IceRpcException(IceRpcError.ConnectionAborted);
 188                    }
 189                }
 21167190            }
 21167191            while (minimumSize > 0);
 21432192        }
 0193        catch (ObjectDisposedException exception)
 0194        {
 0195            throw new IceRpcException(
 0196                IceRpcError.OperationAborted,
 0197                "The read operation was aborted by the disposal of the duplex connection.",
 0198                exception);
 199        }
 200
 21432201        _ = await _pipe.Writer.FlushAsync(cancellationToken).ConfigureAwait(false);
 202
 21423203        _pipe.Reader.TryRead(out readResult);
 21423204        Debug.Assert(!readResult.IsCompleted && !readResult.IsCanceled);
 205
 21423206        return readResult.Buffer;
 26133207    }
 208}
Generated by: ReportGenerator 5.3.8.0
11/14/2025 - 16:01:03
GitHub | reportgenerator.io

Methods/Properties

Dispose()
.ctor(IceRpc.Transports.IDuplexConnection,System.Buffers.MemoryPool`1<System.Byte>,System.Int32)
AdvanceTo(System.SequencePosition)
AdvanceTo(System.SequencePosition,System.SequencePosition)
FillBufferWriterAsync(System.Buffers.IBufferWriter`1<System.Byte>,System.Int32,System.Threading.CancellationToken)
ReadFromConnectionAsync()
ReadAsync(System.Threading.CancellationToken)
ReadAtLeastAsync(System.Int32,System.Threading.CancellationToken)
TryRead(System.Buffers.ReadOnlySequence`1<System.Byte>&)
ReadAsyncCore()