public async ValueTask ProcessIncomingPacketAsync(
IInputLogger?m,
InputPump sender,
byte header,
int packetLength,
PipeReader pipeReader,
Func <ValueTask> next,
CancellationToken cancellationToken)
{
if (PacketType.PingResponse != (PacketType)header)
{
await next();
return;
}
using (m?.ProcessPacket(PacketType.PingResponse))
{
WaitingPingResp = false;
if (packetLength > 0)
{
m?.UnparsedExtraBytes(sender, PacketType.PingResponse, 0, packetLength, packetLength);
}
await pipeReader.SkipBytes(packetLength);
}
}
public async ValueTask ProcessIncomingPacketAsync(IInputLogger?m, InputPump sender, byte header, int packetLength, PipeReader pipeReader, Func <ValueTask> next, CancellationToken cancellationToken)
{
if (PacketType.SubscribeAck != (PacketType)header)
{
await next();
return;
}
using (m?.ProcessPacket(PacketType.SubscribeAck))
{
ReadResult?read = await pipeReader.ReadAsync(m, packetLength);
if (!read.HasValue)
{
return;
}
Parse(read.Value.Buffer, packetLength, out ushort packetId, out QualityOfService[]? qos, out SequencePosition position);
pipeReader.AdvanceTo(position);
await _store.OnQos1AckAsync(m, packetId, qos);
}
}
public StateHolder(InputPump input, OutputPump output) => (Input, OutputPump) = (input, output);
public async ValueTask ProcessIncomingPacketAsync(IInputLogger?m, InputPump sender, byte header, int packetLength, PipeReader reader, Func <ValueTask> next, CancellationToken cancellationToken)
{
if ((PacketType)((header >> 4) << 4) != PacketType.Publish)
{
await next();
return;
}
QualityOfService qos = (QualityOfService)((header >> 1) & 3);
using (m?.ProcessPublishPacket(sender, header, packetLength, reader, next, qos))
{
bool dup = (header & _dupFlag) > 0;
bool retain = (header & _retainFlag) > 0;
if ((byte)qos > 2)
{
throw new ProtocolViolationException($"Parsed QoS byte is invalid({(byte)qos}).");
}
string?topic;
ushort packetId;
while (true)
{
ReadResult read = await reader.ReadAsync();
if (read.IsCanceled)
{
return;
}
if (qos == QualityOfService.AtMostOnce)
{
string theTopic = await reader.ReadMQTTString();
await _messageHandler(_mqttConfiguration.OnInputMonitor, theTopic, reader, packetLength - theTopic.MQTTSize(), qos, retain, cancellationToken);
return;
}
if (Publish.ParsePublishWithPacketId(read.Buffer, out topic, out packetId, out SequencePosition position))
{
reader.AdvanceTo(position);
break;
}
reader.AdvanceTo(read.Buffer.Start, read.Buffer.End);
}
if (qos == QualityOfService.AtLeastOnce)
{
await _messageHandler(_mqttConfiguration.OnInputMonitor, topic, reader, packetLength - 2 - topic.MQTTSize(), qos, retain, cancellationToken);
if (!_output.QueueReflexMessage(LifecyclePacketV3.Puback(packetId)))
{
m?.QueueFullPacketDropped(PacketType.PublishAck, packetId);
}
return;
}
if (qos != QualityOfService.ExactlyOnce)
{
throw new ProtocolViolationException();
}
await _store.StoreId(m, packetId);
await _messageHandler(_mqttConfiguration.OnInputMonitor, topic, reader, packetLength - 2 - topic.MQTTSize(), qos, retain, cancellationToken);
if (!_output.QueueReflexMessage(LifecyclePacketV3.Pubrec(packetId)))
{
m?.QueueFullPacketDropped(PacketType.PublishReceived, packetId);
}
}
}
/// <inheritdoc/>
public async Task <ConnectResult> ConnectAsync(IActivityMonitor?m, MqttClientCredentials?credentials = null, OutgoingLastWill?lastWill = null)
{
if (IsConnected)
{
throw new InvalidOperationException("This client is already connected.");
}
using (m?.OpenTrace("Connecting..."))
{
try
{
(IOutgoingPacketStore store, IIncomingPacketStore packetIdStore) = await _config.StoreFactory.CreateAsync(m, _pConfig, _config, _config.ConnectionString, credentials?.CleanSession ?? true);
IMqttChannel channel = await _config.ChannelFactory.CreateAsync(m, _config.ConnectionString);
ConnectAckReflex connectAckReflex = new();
Task <ConnectResult> connectedTask = connectAckReflex.Task;
var output = new OutputPump(this, _pConfig);
OutputProcessor outputProcessor;
var input = new InputPump(this, channel.DuplexPipe.Input, connectAckReflex.ProcessIncomingPacket);
OpenPumps(m, new ClientState(input, output, channel, packetIdStore, store));
ReflexMiddlewareBuilder builder = new ReflexMiddlewareBuilder()
.UseMiddleware(new PublishReflex(_config, packetIdStore, OnMessage, output))
.UseMiddleware(new PublishLifecycleReflex(packetIdStore, store, output))
.UseMiddleware(new SubackReflex(store))
.UseMiddleware(new UnsubackReflex(store));
if (_config.KeepAliveSeconds == 0)
{
outputProcessor = new OutputProcessor(output, channel.DuplexPipe.Output, store);
}
else
{
OutputProcessorWithKeepAlive withKeepAlive = new(_config, output, channel.DuplexPipe.Output, store);;
outputProcessor = withKeepAlive;
_ = builder.UseMiddleware(withKeepAlive);
}
output.StartPumping(outputProcessor);
connectAckReflex.Reflex = builder.Build(InvalidPacket);
OutgoingConnect outgoingConnect = new(_pConfig, _config, credentials, lastWill);
CancellationTokenSource cts = new(_config.WaitTimeoutMilliseconds);
IOutgoingPacket.WriteResult writeConnectResult = await outgoingConnect.WriteAsync(_pConfig.ProtocolLevel, channel.DuplexPipe.Output, cts.Token);
if (writeConnectResult != IOutgoingPacket.WriteResult.Written)
{
_ = await CloseAsync(DisconnectedReason.None);
return(new ConnectResult(ConnectError.Timeout));
}
Task timeout = _config.DelayHandler.Delay(_config.WaitTimeoutMilliseconds, CloseToken);
_ = await Task.WhenAny(connectedTask, timeout);
// This following code wouldn't be better with a sort of ... switch/pattern matching ?
if (connectedTask.Exception is not null)
{
m?.Fatal(connectedTask.Exception);
_ = await CloseAsync(DisconnectedReason.None);
return(new ConnectResult(ConnectError.InternalException));
}
if (CloseToken.IsCancellationRequested)
{
_ = await CloseAsync(DisconnectedReason.None);
return(new ConnectResult(ConnectError.RemoteDisconnected));
}
if (!connectedTask.IsCompleted)
{
_ = await CloseAsync(DisconnectedReason.None);
return(new ConnectResult(ConnectError.Timeout));
}
ConnectResult res = await connectedTask;
if (res.ConnectError != ConnectError.Ok)
{
_ = await CloseAsync(DisconnectedReason.None);
return(new ConnectResult(res.ConnectError));
}
bool askedCleanSession = credentials?.CleanSession ?? true;
if (askedCleanSession && res.SessionState != SessionState.CleanSession)
{
_ = await CloseAsync(DisconnectedReason.None);
return(new ConnectResult(ConnectError.ProtocolError_SessionNotFlushed));
}
if (res.SessionState == SessionState.CleanSession)
{
ValueTask task = packetIdStore.ResetAsync();
await store.ResetAsync();
await task;
}
else
{
throw new NotImplementedException();
}
return(res);
}
catch (Exception e)
{
m?.Error("Error while connecting, closing client.", e);
_ = await CloseAsync(DisconnectedReason.None);
return(new ConnectResult(ConnectError.InternalException));
}
}
}
public ClientState(InputPump input, OutputPump output, IMqttChannel channel, IIncomingPacketStore packetIdStore, IOutgoingPacketStore store) : base(input, output)
{
Channel = channel;
PacketIdStore = packetIdStore;
Store = store;
}
async ValueTask InvalidPacket(IInputLogger?m, InputPump sender, byte header, int packetSize, PipeReader reader, CancellationToken cancellationToken)
{
_ = await CloseAsync(DisconnectedReason.ProtocolError);
throw new ProtocolViolationException();
}