public Task StartAsync(CancellationToken cancellationToken)
{
Logger.LogInformation($"JT808 TCP Server start at {IPAddress.Any}:{Configuration.TcpPort}.");
Task.Factory.StartNew(async() =>
{
while (!cancellationToken.IsCancellationRequested)
{
var socket = await server.AcceptAsync();
UnionTcpSession jT808TcpSession = new UnionTcpSession(socket);
SessionManager.TryAdd(jT808TcpSession);
await Task.Factory.StartNew(async(state) =>
{
var session = (UnionTcpSession)state;
if (Logger.IsEnabled(LogLevel.Information))
{
Logger.LogInformation($"[Connected]:{session.Client.RemoteEndPoint}");
}
var pipe = new Pipe();
Task writing = FillPipeAsync(session, pipe.Writer);
Task reading = ReadPipeAsync(session, pipe.Reader);
await Task.WhenAll(reading, writing);
SessionManager.RemoveBySessionId(session.SessionID);
}, jT808TcpSession);
}
}, cancellationToken);
return(Task.CompletedTask);
}
private async Task FillPipeAsync(UnionTcpSession session, PipeWriter writer)
{
while (true)
{
try
{
Memory <byte> memory = writer.GetMemory(Configuration.MiniNumBufferSize);
//设备多久没发数据就断开连接 Receive Timeout.
int bytesRead = await session.Client.ReceiveAsync(memory, SocketFlags.None, session.ReceiveTimeout.Token);
if (bytesRead == 0)
{
break;
}
writer.Advance(bytesRead);
}
catch (OperationCanceledException ex)
{
Logger.LogError($"[Receive Timeout]:{session.Client.RemoteEndPoint}");
break;
}
catch (System.Net.Sockets.SocketException ex)
{
Logger.LogError($"[{ex.SocketErrorCode.ToString()},{ex.Message}]:{session.Client.RemoteEndPoint}");
break;
}
#pragma warning disable CA1031 // Do not catch general exception types
catch (Exception ex)
{
Logger.LogError(ex, $"[Receive Error]:{session.Client.RemoteEndPoint}");
break;
}
#pragma warning restore CA1031 // Do not catch general exception types
FlushResult result = await writer.FlushAsync();
if (result.IsCompleted)
{
break;
}
}
writer.Complete();
}
private async Task ReadPipeAsync(UnionTcpSession session, PipeReader reader)
{
while (true)
{
ReadResult result = await reader.ReadAsync();
if (result.IsCompleted)
{
break;
}
ReadOnlySequence <byte> buffer = result.Buffer;
SequencePosition consumed = buffer.Start;
SequencePosition examined = buffer.End;
try
{
if (result.IsCanceled)
{
break;
}
if (buffer.Length > 0)
{
ReaderBuffer(ref buffer, session, out consumed, out examined);
}
}
#pragma warning disable CA1031 // Do not catch general exception types
catch (Exception ex)
{
Logger.LogError(ex, $"[ReadPipe Error]:{session.Client.RemoteEndPoint}");
break;
}
#pragma warning restore CA1031 // Do not catch general exception types
finally
{
reader.AdvanceTo(consumed, examined);
}
}
reader.Complete();
}
private void ReaderBuffer(ref ReadOnlySequence <byte> buffer, UnionTcpSession session, out SequencePosition consumed, out SequencePosition examined)
{
consumed = buffer.Start;
examined = buffer.End;
SequenceReader <byte> seqReader = new SequenceReader <byte>(buffer);
if (seqReader.TryPeek(out byte beginMark))
{
if (beginMark != JT808Package.BeginFlag)
{
throw new ArgumentException("Not JT808 Packages.");
}
}
byte mark = 0;
long totalConsumed = 0;
while (!seqReader.End)
{
if (seqReader.IsNext(JT808Package.BeginFlag, advancePast: true))
{
if (mark == 1)
{
ReadOnlySpan <byte> contentSpan = ReadOnlySpan <byte> .Empty;
try
{
contentSpan = seqReader.Sequence.Slice(totalConsumed, seqReader.Consumed - totalConsumed).FirstSpan;
//过滤掉不是808标准包（14）
//（头）1+（消息 ID ）2+（消息体属性）2+（终端手机号）6+（消息流水号）2+（检验码 ）1+（尾）1
if (contentSpan.Length > 14)
{
var package = Serializer.HeaderDeserialize(contentSpan, minBufferSize: 10240);
AtomicCounterService.MsgSuccessIncrement();
if (Logger.IsEnabled(LogLevel.Debug))
{
Logger.LogDebug($"[Atomic Success Counter]:{AtomicCounterService.MsgSuccessCount}");
}
if (Logger.IsEnabled(LogLevel.Trace))
{
Logger.LogTrace($"[Accept Hex {session.Client.RemoteEndPoint}]:{package.OriginalData.ToArray().ToHexString()}");
}
SessionManager.TryLink(package.Header.TerminalPhoneNo, session);
_unionNormalReplyMessageHandler.Processor(package, session);
}
}
catch (NotImplementedException ex)
{
Logger.LogError(ex.Message);
}
catch (JT808Exception ex)
{
AtomicCounterService.MsgFailIncrement();
if (Logger.IsEnabled(LogLevel.Information))
{
Logger.LogInformation($"[Atomic Fail Counter]:{AtomicCounterService.MsgFailCount}");
}
Logger.LogError($"[HeaderDeserialize ErrorCode]:{ ex.ErrorCode},[ReaderBuffer]:{contentSpan.ToArray().ToHexString()}");
}
totalConsumed += (seqReader.Consumed - totalConsumed);
if (seqReader.End)
{
break;
}
seqReader.Advance(1);
mark = 0;
}
mark++;
}
else
{
seqReader.Advance(1);
}
}
if (seqReader.Length == totalConsumed)
{
examined = consumed = buffer.End;
}
else
{
consumed = buffer.GetPosition(totalConsumed);
}
}
