public async Task DispatchApplicationMessageAsync(MqttClientSession senderClientSession, MqttApplicationMessage applicationMessage)
{
try
{
var interceptorContext = new MqttApplicationMessageInterceptorContext
{
ApplicationMessage = applicationMessage
};
_options.ApplicationMessageInterceptor?.Invoke(interceptorContext);
applicationMessage = interceptorContext.ApplicationMessage;
if (applicationMessage.Retain)
{
await _clientRetainedMessageManager.HandleMessageAsync(senderClientSession?.ClientId, applicationMessage).ConfigureAwait(false);
}
var eventArgs = new MqttApplicationMessageReceivedEventArgs(senderClientSession?.ClientId, applicationMessage);
ApplicationMessageReceived?.Invoke(this, eventArgs);
}
catch (Exception exception)
{
_logger.LogError(new EventId(), exception, "Error while processing application message");
}
lock (_sessions)
{
foreach (var clientSession in _sessions.Values.ToList())
{
clientSession.EnqueuePublishPacket(applicationMessage.ToPublishPacket());
}
}
}
private async Task HandleIncomingPublishPacketAsync(IMqttCommunicationAdapter adapter, MqttPublishPacket publishPacket, CancellationToken cancellationToken)
{
var applicationMessage = publishPacket.ToApplicationMessage();
var interceptorContext = new MqttApplicationMessageInterceptorContext
{
ApplicationMessage = applicationMessage
};
_options.ApplicationMessageInterceptor?.Invoke(interceptorContext);
applicationMessage = interceptorContext.ApplicationMessage;
if (applicationMessage.Retain)
{
await _clientRetainedMessageManager.HandleMessageAsync(ClientId, applicationMessage).ConfigureAwait(false);
}
switch (applicationMessage.QualityOfServiceLevel)
{
case MqttQualityOfServiceLevel.AtMostOnce:
{
_sessionsManager.DispatchApplicationMessage(this, applicationMessage);
return;
}
case MqttQualityOfServiceLevel.AtLeastOnce:
{
_sessionsManager.DispatchApplicationMessage(this, applicationMessage);
await adapter.SendPacketsAsync(_options.DefaultCommunicationTimeout, cancellationToken,
new MqttPubAckPacket { PacketIdentifier = publishPacket.PacketIdentifier });
return;
}
case MqttQualityOfServiceLevel.ExactlyOnce:
{
// QoS 2 is implement as method "B" [4.3.3 QoS 2: Exactly once delivery]
lock (_unacknowledgedPublishPackets)
{
_unacknowledgedPublishPackets.Add(publishPacket.PacketIdentifier);
}
_sessionsManager.DispatchApplicationMessage(this, applicationMessage);
await adapter.SendPacketsAsync(_options.DefaultCommunicationTimeout, cancellationToken,
new MqttPubRecPacket { PacketIdentifier = publishPacket.PacketIdentifier }).ConfigureAwait(false);
return;
}
default:
throw new MqttCommunicationException("Received a not supported QoS level.");
}
}