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Add support for topic alias.

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This commit is contained in:
Christian Kratky
2020-11-09 21:10:05 +01:00
parent 6c15693456
commit e1bf9de347
9 changed files with 144 additions and 35 deletions
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Source/MQTTnet/Server/MqttClientConnection.cs
+35 -30
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@@ -18,6 +18,7 @@ namespace MQTTnet.Server
{
public sealed class MqttClientConnection : IDisposable
{
readonly Dictionary<ushort, string> _topicAlias = new Dictionary<ushort, string>();
readonly MqttPacketIdentifierProvider _packetIdentifierProvider = new MqttPacketIdentifierProvider();
readonly MqttPacketDispatcher _packetDispatcher = new MqttPacketDispatcher();
readonly CancellationTokenSource _cancellationToken = new CancellationTokenSource();
@@ -316,19 +317,26 @@ namespace MQTTnet.Server
{
Interlocked.Increment(ref _sentApplicationMessagesCount);
HandleTopicAlias(publishPacket);
var applicationMessage = _dataConverter.CreateApplicationMessage(publishPacket);
_sessionsManager.DispatchApplicationMessage(applicationMessage, this);
switch (publishPacket.QualityOfServiceLevel)
{
case MqttQualityOfServiceLevel.AtMostOnce:
{
return HandleIncomingPublishPacketWithQoS0Async(publishPacket);
return PlatformAbstractionLayer.CompletedTask;
}
case MqttQualityOfServiceLevel.AtLeastOnce:
{
return HandleIncomingPublishPacketWithQoS1Async(publishPacket, cancellationToken);
var pubAckPacket = _dataConverter.CreatePubAckPacket(publishPacket);
return SendAsync(pubAckPacket, cancellationToken);
}
case MqttQualityOfServiceLevel.ExactlyOnce:
{
return HandleIncomingPublishPacketWithQoS2Async(publishPacket, cancellationToken);
var pubRecPacket = _dataConverter.CreatePubRecPacket(publishPacket);
return SendAsync(pubRecPacket, cancellationToken);
}
default:
{
@@ -337,36 +345,33 @@ namespace MQTTnet.Server
}
}
Task HandleIncomingPublishPacketWithQoS0Async(MqttPublishPacket publishPacket)
void HandleTopicAlias(MqttPublishPacket publishPacket)
{
var applicationMessage = _dataConverter.CreateApplicationMessage(publishPacket);
_sessionsManager.DispatchApplicationMessage(applicationMessage, this);
return PlatformAbstractionLayer.CompletedTask;
}
Task HandleIncomingPublishPacketWithQoS1Async(MqttPublishPacket publishPacket, CancellationToken cancellationToken)
{
var applicationMessage = _dataConverter.CreateApplicationMessage(publishPacket);
_sessionsManager.DispatchApplicationMessage(applicationMessage, this);
var pubAckPacket = _dataConverter.CreatePubAckPacket(publishPacket);
return SendAsync(pubAckPacket, cancellationToken);
}
Task HandleIncomingPublishPacketWithQoS2Async(MqttPublishPacket publishPacket, CancellationToken cancellationToken)
{
var applicationMessage = _dataConverter.CreateApplicationMessage(publishPacket);
_sessionsManager.DispatchApplicationMessage(applicationMessage, this);
var pubRecPacket = new MqttPubRecPacket
if (publishPacket.Properties?.TopicAlias == null)
{
PacketIdentifier = publishPacket.PacketIdentifier,
ReasonCode = MqttPubRecReasonCode.Success
};
return;
}
return SendAsync(pubRecPacket, cancellationToken);
var topicAlias = publishPacket.Properties.TopicAlias.Value;
lock (_topicAlias)
{
if (!string.IsNullOrEmpty(publishPacket.Topic))
{
_topicAlias[topicAlias] = publishPacket.Topic;
}
else
{
if (_topicAlias.TryGetValue(topicAlias, out var topic))
{
publishPacket.Topic = topic;
}
else
{
}
}
}
}
async Task SendPendingPacketsAsync(CancellationToken cancellationToken)