/// <summary>
/// Forwards all bytes coming from a <see cref="PipeReader"/> to the specified <see cref="PipeWriter"/>.
/// </summary>
/// <param name="reader">The reader to get bytes from.</param>
/// <param name="writer">The writer to copy bytes to.</param>
/// <param name="cancellationToken">A cancellation token.</param>
/// <returns>
/// A <see cref="Task"/> that completes when the <paramref name="reader"/> has finished producing bytes, or an error occurs.
/// This <see cref="Task"/> never faults, since any exceptions are used to complete the <paramref name="writer"/>.
/// </returns>
/// <remarks>
/// If an error occurs during reading or writing, the <paramref name="writer"/> is completed with the exception.
/// </remarks>
internal static Task LinkToAsync(this PipeReader reader, PipeWriter writer, CancellationToken cancellationToken = default)
{
Requires.NotNull(reader, nameof(reader));
Requires.NotNull(writer, nameof(writer));
return(Task.Run(async delegate
{
try
{
while (true)
{
cancellationToken.ThrowIfCancellationRequested();
var result = await reader.ReadAsync(cancellationToken).ConfigureAwait(false);
writer.Write(result.Buffer);
reader.AdvanceTo(result.Buffer.End);
result.ScrubAfterAdvanceTo();
await writer.FlushAsync(cancellationToken).ConfigureAwait(false);
if (result.IsCompleted)
{
await writer.CompleteAsync().ConfigureAwait(false);
break;
}
}
await reader.CompleteAsync().ConfigureAwait(false);
}
catch (Exception ex)
{
await writer.CompleteAsync(ex).ConfigureAwait(false);
await reader.CompleteAsync(ex).ConfigureAwait(false);
}
}));
}
private async Task ReceiveDataAsync(PipeReader reader, Memory <byte> destinationMemory, CancellationToken cancellationToken)
{
var position = 0;
while (true)
{
var result = await reader.ReadAsync(cancellationToken);
var buffer = result.Buffer;
foreach (var memory in buffer)
{
memory.CopyTo(destinationMemory.Slice(position, memory.Length));
position += memory.Length;
}
reader.AdvanceTo(buffer.End, buffer.End);
if (result.IsCompleted)
{
break;
}
}
await reader.CompleteAsync();
}
static async Task ReadPipeAsync(PipeReader reader, CsvWriter csvWriter, Mapper mapper)
{
while (true)
{
var result = await reader.ReadAsync();
ReadOnlySequence <byte> buffer = result.Buffer;
while (TryReadCarUpdateDatagram(ref buffer, out var completeDatagram))
{
var carData = StructSerializer
.Deserialize <CarUpdateDatagram>(completeDatagram.ToArray(), 0);
var carModel = mapper.Map <CarStateModel>(carData);
csvWriter.NextRecord();
csvWriter.WriteRecord(carModel);
}
reader.AdvanceTo(buffer.Start, buffer.End);
if (result.IsCompleted)
{
break;
}
}
await reader.CompleteAsync();
}
/// <summary>
/// Liest die Pipe aus, parsed die Daten und gibt diese weiter an die API. (Wird erst beenden, wenn cancellationToken abgebrochen wird)
/// </summary>
/// <param name="reader">Der Reader von der Pipe, welche ausgelesen werden soll</param>
/// <param name="cancellationToken"></param>
/// <returns>Wird erst beenden, wenn cancellationToken abgebrochen wird</returns>
private async Task ReadPipeAsync(PipeReader reader, CancellationToken cancellationToken)
{
var keepRunning = true;
cancellationToken.Register(() => keepRunning = false);
while (keepRunning)
{
ReadResult result = await reader.ReadAsync();
ReadOnlySequence <byte> buffer = result.Buffer;
while (this.TryReadMessage(ref buffer, out ReadOnlySequence <byte> line, "\n"))
{
// Process the line.
//this.ProcessLine(line);
}
// Tell the PipeReader how much of the buffer has been consumed.
reader.AdvanceTo(buffer.Start, buffer.End);
// Stop reading if there's no more data coming.
if (result.IsCompleted)
{
break;
}
}
// Mark the PipeReader as complete.
await reader.CompleteAsync();
}
private async Task RunProcessAsync(PipeReader reader,
CancellationToken cancellationToken = default)
{
ReadResult readResult = default;
FlushResult flushResult = default;
try
{
while (!readResult.IsCompleted && !flushResult.IsCompleted)
{
cancellationToken.ThrowIfCancellationRequested();
readResult = await reader
.ReadAsync(cancellationToken);
var buffer = readResult.Buffer;
var consumed = buffer.Start;
var examined = buffer.End;
if (await TryProcessPacketAsync(ref buffer,
cancellationToken))
{
consumed = buffer.Start;
examined = consumed;
}
reader.AdvanceTo(consumed, examined);
}
}
finally
{
await reader.CompleteAsync();
}
}
private async Task ReadPipeAsync(PipeReader reader)
{
try
{
int?length = null;
while (true)
{
// Read data written to the pipe that has been made available.
var result = await reader.ReadAsync()
.ConfigureAwait(false);
var buffer = result.Buffer;
while (true)
{
if (!length.HasValue)
{
if (buffer.Length < sizeof(int))
{
// The length prefix has not been received yet.
break;
}
// Enough data is available to read the length prefix.
length = ReadLengthPrefix(buffer);
// Slice away the part that contains the length prefix.
buffer = buffer.Slice(sizeof(int));
}
if (buffer.Length < length.Value)
{
// The remaining data has not been received yet.
break;
}
// Restart the disconnection timer, because a message has just been received.
_disconnectTimer.Change(DisconnectTimeout, Timeout.Infinite);
DataReceived?.Invoke(this, buffer.Slice(0, length.Value));
// Slice away the bytes that have been processed.
buffer = buffer.Slice(length.Value);
length = null;
}
// Mark the processed data as consumed and indicate that the rest has been examined.
reader.AdvanceTo(buffer.Start, buffer.End);
if (result.IsCompleted)
{
break;
}
}
}
finally
{
await reader.CompleteAsync()
.ConfigureAwait(false);
}
}
private async ValueTask StartReadPipe(PipeReader pipeReader, CancellationToken cancellationToken)
{
var processor = new PacketsProcessor(_channelWriter);
try
{
while (true)
{
cancellationToken.ThrowIfCancellationRequested();
var result = await pipeReader.ReadAsync(cancellationToken);
var length = await processor.ProcessBytesAsync(result.Buffer, cancellationToken);
pipeReader.AdvanceTo(result.Buffer.GetPosition(length));
if (result.IsCompleted)
{
break;
}
}
}
catch (SocketException e)
{
await pipeReader.CompleteAsync(e);
_channelWriter.Complete(e);
}
}
/// <summary>
/// Deserializes the header part of the fits document
/// </summary>
/// <param name="dataStream">the stream from which to read the data from (should be at position 0)</param>
/// <exception cref="InvalidDataException"></exception>
public async Task <Header> DeserializeAsync(PipeReader dataStream)
{
PreValidateStream(dataStream);
var endOfHeaderReached = false;
var headerEntries = new List <HeaderEntry>();
while (!endOfHeaderReached)
{
var result = await dataStream.ReadAsync().ConfigureAwait(false);
var headerBlock = result.Buffer;
if (result.IsCompleted || result.Buffer.Length < HeaderBlockSize)
{
await dataStream.CompleteAsync().ConfigureAwait(false);
throw new InvalidDataException("No END marker found for the fits header, fits file might be corrupted");
}
headerEntries.AddRange(ParseHeaderBlock(headerBlock, out endOfHeaderReached));
dataStream.AdvanceTo(result.Buffer.GetPosition(HeaderBlockSize), result.Buffer.End);
}
return(new Header(headerEntries));
}
protected virtual async Task Receive(PipeReader reader)
{
try
{
while (!cancellationToken.IsCancellationRequested)
{
ReadResult result = await reader.ReadAsync(cancellationToken);
if (result.IsCompleted)
{
break;
}
ReadOnlySequence <byte> buffer = result.Buffer;
while (TryReadLine(ref buffer, out ReadOnlySequence <byte> line))
{
await ProcessLine(Id, line);
}
reader.AdvanceTo(buffer.Start, buffer.End);
}
}
catch (Exception e)
{
await LogException(e.Message);
}
finally
{
await reader.CompleteAsync();
Stop();
Dispose();
}
}
private async Task PipeProcessorAsync(PipeReader reader, CancellationToken cancelationToken = default)
{
while (!cancelationToken.IsCancellationRequested)
{
var result = await reader.ReadAsync(cancelationToken);
var buffer = result.Buffer;
SequencePosition?position;
do
{
position = buffer.PositionOf((byte)'\n');
if (position != null)
{
var notif = msgProc.PushMessage(buffer.Slice(0, position.Value).ToArray());
if (notif.HasValue)
{
dispatcher.Invoke(notif.Value);
}
// +2 = skipping \n\r
buffer = buffer.Slice(buffer.GetPosition(2, position.Value));
}
} while (position != null);
reader.AdvanceTo(buffer.Start, buffer.End);
if (result.IsCompleted || result.IsCanceled)
{
break;
}
}
await reader.CompleteAsync();
}
private static async Task <List <byte[]> > ListenAsync(PipeReader input)
{
var messages = new List <byte[]>();
const int messageLength = 3;
while (true)
{
var result = await input.ReadAsync();
var buffer = result.Buffer;
while (!buffer.IsEmpty)
{
var payload = buffer.Slice(0, messageLength);
messages.Add(payload.ToArray());
buffer = buffer.Slice(messageLength);
}
input.AdvanceTo(buffer.Start, buffer.End);
if (result.IsCompleted)
{
break;
}
}
await input.CompleteAsync();
return(messages);
}
private static async IAsyncEnumerable <ReadOnlySequence <byte> > GetReaderResult(
PipeReader reader, [EnumeratorCancellation] CancellationToken token = default)
{
while (true && !token.IsCancellationRequested)
{
ReadResult result = await reader.ReadAsync();
ReadOnlySequence <byte> buffer = result.Buffer;
if (buffer.Length < 4)
{
yield break;
}
var position = buffer.GetPosition(sizeof(int));
Console.WriteLine("Reading...");
yield return(buffer.Slice(0, position));
buffer = buffer.Slice(position);
reader.AdvanceTo(buffer.Start, position);
// Tell the PipeReader how much of the buffer has been consumed.
// Stop reading if there's no more data coming.
if (result.IsCompleted)
{
break;
}
}
// Mark the PipeReader as complete.
await reader.CompleteAsync();
}
protected override async Task ExecuteAsync(CancellationToken cancellationToken)
{
_logger.LogInformation("Worker started");
_payloadReadyEvent.Wait(cancellationToken);
_payloadReadyEvent.Reset();
while (!cancellationToken.IsCancellationRequested)
{
_logger.LogInformation("Worker running at: {time}", DateTimeOffset.UtcNow);
if (!File.Exists(Constants.EXPECTED_ZIP_FILE_NAME))
{
// The package hasn't arrived yet
_logger.LogDebug("Compressed payload not found {filename}", Constants.EXPECTED_ZIP_FILE_NAME);
await Task.Delay(TimeSpan.FromSeconds(1), cancellationToken);
continue;
}
using ZipArchive zipArchive = ZipFile.OpenRead(Constants.EXPECTED_ZIP_FILE_NAME);
ZipArchiveEntry dataEntry = zipArchive.Entries.SingleOrDefault();
Stream zipEntryStream = dataEntry.Open();
StreamPipeReaderOptions streamOptions =
new StreamPipeReaderOptions(bufferSize: MINIMUM_BUFFER_SIZE);
PipeReader pipeReader = PipeReader.Create(zipEntryStream, streamOptions);
while (true)
{
_logger.LogDebug("Reading stream into pipe buffer");
ReadResult result = await pipeReader.ReadAsync(cancellationToken);
ReadOnlySequence <byte> buffer = result.Buffer;
// Notify the PipeReader how much buffer was used
pipeReader.AdvanceTo(buffer.Start, buffer.End);
if (!result.IsCompleted)
{
continue;
}
_logger.LogDebug("Payload read");
JsonDocument documentFromBuffer = InspectBuffer(buffer);
_ = await _payloadChannel.AddPayloadAsync(documentFromBuffer, cancellationToken);
break;
}
await pipeReader.CompleteAsync();
await Task.Delay(TimeSpan.FromSeconds(1), cancellationToken);
return;
}
if (cancellationToken.IsCancellationRequested)
{
_logger.LogWarning("Operation cancelled");
}
}
private async Task ReadPipeAsync(PipeReader reader, CancellationToken cancellationToken)
{
while (!cancellationToken.IsCancellationRequested)
{
var result = await reader.ReadAsync(cancellationToken);
var buffer = new ByteReader(result.Buffer);
while (!buffer.IsEnd)
{
try
{
if (!await ProcessAsync(buffer))
{
break;
}
}
catch (Exception ex)
{
LogError(ex);
break;
}
}
// 告诉PipeReader我们已经处理多少缓冲
reader.AdvanceTo(buffer.Start, buffer.End);
// 如果没有更多的数据，停止都去
if (result.IsCompleted)
{
break;
}
}
// 将PipeReader标记为完成
await reader.CompleteAsync();
}
private static async Task ProcessLinesAsync(Socket socket)
{
Console.WriteLine($"[{socket.RemoteEndPoint}]: connected");
NetworkStream stream = new NetworkStream(socket);
PipeReader reader = PipeReader.Create(stream);
while (true)
{
ReadResult result = await reader.ReadAsync();
ReadOnlySequence <byte> buffer = result.Buffer;
while (TryReadLine(ref buffer, out ReadOnlySequence <byte> line))
{
ProcessLine(line);
}
reader.AdvanceTo(buffer.Start, buffer.End);
if (result.IsCompleted)
{
break;
}
}
await reader.CompleteAsync();
Console.WriteLine($"[{socket.RemoteEndPoint}]: disconnected");
}
public static async IAsyncEnumerable <ResultRow> Reader(PipeReader reader)
{
var keys = new FastSerializableKeys <string>();
while (true)
{
var result = await reader.ReadAsync().ConfigureAwait(false);
var buffer = result.Buffer;
SequencePosition?position;
do
{
position = buffer.PositionOf((byte)'\n');
if (position == null)
{
continue;
}
var row = DeserializeRow(keys, buffer.Slice(0, position.Value));
yield return(row);
buffer = buffer.Slice(buffer.GetPosition(1, position.Value));
} while (position != null);
reader.AdvanceTo(buffer.Start, buffer.End);
if (result.IsCompleted)
{
break;
}
}
await reader.CompleteAsync().ConfigureAwait(false);
}
async Task ReadPipeAsync(PipeReader reader)
{
while (true)
{
ReadResult result = await reader.ReadAsync();
ReadOnlySequence <byte> buffer = result.Buffer;
while (TryReadLine(ref buffer, out ReadOnlySequence <byte> line))
{
// Process the line.
ProcessLine(line);
}
// Tell the PipeReader how much of the buffer has been consumed.
reader.AdvanceTo(buffer.Start, buffer.End);
// Stop reading if there's no more data coming.
if (result.IsCompleted)
{
break;
}
}
// Mark the PipeReader as complete.
await reader.CompleteAsync();
}
private async Task ReadPipeAsync(PipeReader reader, CancellationToken cancellationToken = default)
{
while (true)
{
if (cancellationToken.IsCancellationRequested)
{
reader.CancelPendingRead();
await reader.CompleteAsync();
break;
}
bool isAny = reader.TryRead(out ReadResult result);
if (!isAny)
{
continue;
}
ReadOnlySequence <byte> buffer = result.Buffer;
// In the event that no message is parsed successfully, mark consumed
// as nothing and examined as the entire buffer.
SequencePosition consumed = buffer.Start;
SequencePosition examined = buffer.End;
try
{
if (parser.TryParse(ref buffer, out Message message, out int bConsumed, GetName()))
{
// A single message was successfully parsed so mark the start as the
// parsed buffer as consumed. TryParseMessage trims the buffer to
// point to the data after the message was parsed.
consumed = buffer.GetPosition(bConsumed);
// Examined is marked the same as consumed here, so the next call
// to ReadSingleMessageAsync will process the next message if there's
// one.
examined = consumed;
Console.WriteLine();
if (!(message is null))
{
foreach (var observer in observers)
{
observer.OnNext(message);
}
}
}
}
catch (Exception e)
{
Console.WriteLine(e);
foreach (var observer in observers)
{
observer.OnError(e);
}
}
finally
{
reader.AdvanceTo(consumed, examined);
}
}
}
public async Task RunAsync(
CancellationToken cancellationToken = default)
{
mp3dec_t decoder;
unsafe
{
mp3dec_init(&decoder);
}
try
{
FlushResult flushResult = default;
ReadResult readResult = default;
while (!flushResult.IsCompleted)
{
readResult = await _input.ReadAsync();
var buffer = readResult.Buffer;
if (buffer.IsEmpty && readResult.IsCompleted)
{
return;
}
while (TryReadFrame(ref buffer, out var frame))
{
var block = _outputPipe.Writer.GetMemory(
(MINIMP3_MAX_SAMPLES_PER_FRAME * sizeof(short))
+ sizeof(short));
var success = TryProcessFrame(frame, ref decoder,
block.Span, out var bytesWritten);
_outputPipe.Writer.Advance(bytesWritten);
// invalid data was passed, so bail out
if (!success)
{
return;
}
}
flushResult = await _outputPipe.Writer.FlushAsync(
cancellationToken);
_input.AdvanceTo(buffer.Start, buffer.End);
}
}
finally
{
_ = await _outputPipe.Writer.FlushAsync(cancellationToken);
await _input.CompleteAsync();
await _outputPipe.Writer.CompleteAsync();
}
private async Task ReadAsync()
{
try
{
while (!_cancellation.IsCancellationRequested)
{
var result = await _pipeReader.ReadAsync(_cancellation.Token);
var buffer = result.Buffer;
var readLength = 0L;
try
{
if (0 < buffer.Length)
{
readLength = OnRead(ref buffer);
}
if (result.IsCanceled)
{
readLength = buffer.Length;
break;
}
if (result.IsCompleted)
{
readLength = buffer.Length;
break;
}
}
catch (Exception ex)
{
readLength = buffer.Length;
OnError(ex);
break;
}
finally
{
_pipeReader.AdvanceTo(buffer.GetPosition(readLength));
}
}
}
catch (OperationCanceledException)
{
// cancel~
}
catch (Exception ex)
{
OnError(ex);
}
finally
{
await _pipeReader.CompleteAsync();
}
}
static async Task ProcessMessagesAsync(
PipeReader reader,
PipeWriter writer)
{
try
{
while (true)
{
ReadResult readResult = await reader.ReadAsync();
ReadOnlySequence <byte> buffer = readResult.Buffer;
try
{
if (readResult.IsCanceled)
{
break;
}
if (TryParseLines(ref buffer, out string message))
{
FlushResult flushResult =
await WriteMessagesAsync(writer, message);
if (flushResult.IsCanceled || flushResult.IsCompleted)
{
break;
}
}
if (readResult.IsCompleted)
{
if (!buffer.IsEmpty)
{
throw new InvalidDataException("Incomplete message.");
}
break;
}
}
finally
{
reader.AdvanceTo(buffer.Start, buffer.End);
}
}
}
catch (Exception ex)
{
Console.Error.WriteLine(ex);
}
finally
{
await reader.CompleteAsync();
await writer.CompleteAsync();
}
}
private async Task ReadPipeAsync(PipeReader reader)
{
try
{
while (State == EstablishedConnectionState.Opened)
{
ReadResult result = await reader.ReadAsync(cts.Token).ConfigureAwait(false);
ReadOnlySequence <byte> buffer = result.Buffer;
if (buffer.Length == 0)
{
continue;
}
SequencePosition consumed;
SequencePosition examined;
try
{
(consumed, examined) = ReadFrames(ref buffer);
Debug.WriteLine($"ADVANCE_TO consumed: {consumed.GetInteger()}, examined: {examined.GetInteger()}");
}
catch (Exception ex)
{
OnError(ErrorCode.FailedToReadFrames, ex);
consumed = buffer.End;
examined = buffer.End;
}
reader.AdvanceTo(consumed, examined);
if (result.IsCompleted)
{
break;
}
}
await reader.CompleteAsync().ConfigureAwait(false);
}
catch (Exception ex)
{
OnError(ErrorCode.ReadPipe, ex);
await reader.CompleteAsync(ex).ConfigureAwait(false);
}
}
/// <inheritdoc/>
public async Task RunAsync(
CancellationToken cancellationToken = default)
{
bool identified = false;
_codec = new TaskCompletionSource <MpegAudioCodec>();
try
{
FlushResult flushResult = default;
ReadResult readResult = default;
while (!flushResult.IsCompleted)
{
readResult = await _input.ReadAsync(cancellationToken);
var buffer = readResult.Buffer;
if (buffer.IsEmpty && readResult.IsCompleted)
{
return;
}
while (TryReadMpegFrame(ref buffer, out var frame,
out var version, out var layer, out var bitrate,
out var samplingRate, out var channelCount))
{
if (!identified)
{
identified = true;
_ = _codec.TrySetResult(
new MpegAudioCodec(version, layer,
samplingRate, channelCount, bitrate));
}
if (!TryWriteFrame(frame, _outputPipe.Writer))
{
return;
}
}
flushResult = await _outputPipe.Writer.FlushAsync(
cancellationToken);
_input.AdvanceTo(buffer.Start, buffer.End);
}
}
finally
{
_ = await _outputPipe.Writer.FlushAsync(cancellationToken);
await _input.CompleteAsync();
await _outputPipe.Writer.CompleteAsync();
}
/// <inheritdoc/>
public async Task RunAsync(
CancellationToken cancellationToken = default)
{
try
{
FlushResult flushResult = default;
ReadResult readResult = default;
while (!flushResult.IsCompleted)
{
readResult = await _input.ReadAsync(cancellationToken);
var buffer = readResult.Buffer;
if (buffer.IsEmpty && readResult.IsCompleted)
{
return;
}
while (TryHandleElement(ref buffer, out var status))
{
if (status == EbmlHandleStatus.NewBlock &&
!TryWriteBlock(_bestAudioTrack, _outputPipe.Writer,
_state.BlockData))
{
return;
}
if (status == EbmlHandleStatus.UnsupportedFile ||
status == EbmlHandleStatus.NoMoreData)
{
return;
}
if (status == EbmlHandleStatus.MissingData)
{
break;
}
}
flushResult = await _outputPipe.Writer.FlushAsync(
cancellationToken);
_input.AdvanceTo(buffer.Start, buffer.End);
}
}
finally
{
_ = await _outputPipe.Writer.FlushAsync(cancellationToken);
await _input.CompleteAsync();
await _outputPipe.Writer.CompleteAsync();
}
/// <summary>
/// Receive multiple messages from a pipe
/// </summary>
public static async IAsyncEnumerable <T> ReceiveAsync <T>(PipeReader source, MessagePipeOptions options = default)
{
if (source == null)
{
throw new ArgumentNullException(nameof(source));
}
options = options.Normalize();
while (true)
{
// obtain the next buffer
options.OnLog("ReceiveAsync obtaining buffer...");
if (!source.TryRead(out var result))
{
result = await source.ReadAsync(options.CancellationToken).ConfigureAwait(false);
}
if (result.IsCanceled)
{
ThrowCancelled();
}
// consume the buffer
var buffer = result.Buffer;
options.OnLog($"ReceiveAsync got {buffer.Length} bytes");
int processed = 0;
while (options.TryRead <T>(ref buffer, out var item))
{
processed++;
yield return(item);
}
if (processed == 0 && result.IsCompleted) // check for termination
{
// we have everything, and there will never be any more; was it clean?
if (!buffer.IsEmpty)
{
ThrowInputCompletedWithPartialPayload();
}
break;
}
// mark what we consumed (the "ref buffer" means we've sliced it already)
source.AdvanceTo(buffer.Start, buffer.End);
}
if (options.MarkComplete)
{
await source.CompleteAsync().ConfigureAwait(false);
}
options.OnLog("ReceiveAsync completed successfully");
}
private async Task ProcessMessagesAsync(CancellationToken cancellationToken)
{
try
{
while (true)
{
SequencePosition?position;
ReadResult result = await _reader.ReadAsync(cancellationToken);
ReadOnlySequence <byte> buffer = result.Buffer;
do
{
position = buffer.PositionOf(SubscriptionSession.Delimiter);
if (position is not null)
{
await _pipeline.ProcessAsync(
_connection,
buffer.Slice(0, position.Value),
cancellationToken);
// Skip the message which was read.
buffer = buffer.Slice(buffer.GetPosition(1, position.Value));
}
}while (position != null);
_reader.AdvanceTo(buffer.Start, buffer.End);
if (result.IsCompleted)
{
break;
}
}
}
catch (OperationCanceledException) when(cancellationToken.IsCancellationRequested)
{
}
catch (WebSocketException)
{
// we will just stop receiving
}
finally
{
// reader should be completed always, so that related pipe writer can
// stop write new messages
await _reader.CompleteAsync();
}
}
public async IAsyncEnumerable <IPacket> ReadPacketAsync(TimeSpan timeout, [EnumeratorCancellation] CancellationToken cancellationToken = default)
{
while (!cancellationToken.IsCancellationRequested)
{
ReadResult result = await _pipeReader.ReadAsync(cancellationToken)
.AsTask()
.WithTimeout(timeout, TimeoutConstants.Message);
ReadOnlySequence <byte> buffer = result.Buffer;
while (!cancellationToken.IsCancellationRequested)
{
// We can't calculate packet size without the packet header
if (buffer.Length < PacketConstants.HeaderSize)
{
break;
}
// Make sure the packet fits in the buffer
// See: https://mariadb.com/kb/en/library/0-packet/
var bodySize = GetBodySize(buffer);
var packetSize = PacketConstants.HeaderSize + bodySize;
if (buffer.Length < packetSize)
{
break;
}
// Process packet and repeat in case there are more packets in the buffer
var packet = TryReadPacket(buffer.Slice(PacketConstants.HeaderSize, bodySize));
if (packet != null)
{
yield return(packet);
}
buffer = buffer.Slice(buffer.GetPosition(packetSize));
}
_pipeReader.AdvanceTo(buffer.Start, buffer.End);
if (result.IsCompleted)
{
break;
}
}
await _pipeReader.CompleteAsync();
}
public async IAsyncEnumerable <ReadOnlySequence <byte> > Frames([EnumeratorCancellation] CancellationToken cancellationToken)
{
ThrowIfDisposed();
_ = FillPipe(cancellationToken);
try
{
while (true)
{
var result = await _reader.ReadAsync(cancellationToken).ConfigureAwait(false);
var buffer = result.Buffer;
while (true)
{
if (buffer.Length < 4)
{
break;
}
var frameSize = buffer.ReadUInt32(0, true);
var totalSize = frameSize + 4;
if (buffer.Length < totalSize)
{
break;
}
yield return(buffer.Slice(4, frameSize));
buffer = buffer.Slice(totalSize);
}
if (result.IsCompleted)
{
break;
}
_reader.AdvanceTo(buffer.Start);
}
}
finally
{
await _reader.CompleteAsync().ConfigureAwait(false);
}
}
private static async Task ProcessMessagesAsync(
PipeReader reader,
ProcessAsync processAsync,
CancellationToken cancellationToken)
{
try
{
while (true)
{
ReadResult result = await reader
.ReadAsync(cancellationToken)
.ConfigureAwait(false);
ReadOnlySequence <byte> buffer = result.Buffer;
SequencePosition? position = null;
do
{
position = buffer.PositionOf(Delimiter);
if (position != null)
{
await processAsync(
buffer.Slice(0, position.Value),
cancellationToken)
.ConfigureAwait(false);
// Skip the message which was read.
buffer = buffer.Slice(buffer.GetPosition(1, position.Value));
}
} while (position != null);
reader.AdvanceTo(buffer.Start, buffer.End);
if (result.IsCompleted)
{
break;
}
}
}
catch (TaskCanceledException) { }
finally
{
await reader.CompleteAsync().ConfigureAwait(false);
}
}
private async ValueTask ConsumeAsync(PipeReader reader, CancellationToken cancellationToken)
{
while (true)
{
var result = await reader.ReadAsync(cancellationToken);
var buffer = result.Buffer;
reader.AdvanceTo(buffer.End, buffer.End);
if (result.IsCompleted)
{
break;
}
}
await reader.CompleteAsync();
}
