public async Task <MqttUnsubAckPacket> UnsubscribeAsync(MqttUnsubscribePacket unsubscribePacket)
{
if (unsubscribePacket == null)
{
throw new ArgumentNullException(nameof(unsubscribePacket));
}
var unsubAckPacket = new MqttUnsubAckPacket
{
PacketIdentifier = unsubscribePacket.PacketIdentifier
};
foreach (var topicFilter in unsubscribePacket.TopicFilters)
{
var interceptorContext = await InterceptUnsubscribeAsync(topicFilter).ConfigureAwait(false);
if (!interceptorContext.AcceptUnsubscription)
{
unsubAckPacket.ReasonCodes.Add(MqttUnsubscribeReasonCode.ImplementationSpecificError);
continue;
}
lock (_subscriptions)
{
if (_subscriptions.Remove(topicFilter))
{
unsubAckPacket.ReasonCodes.Add(MqttUnsubscribeReasonCode.Success);
}
else
{
unsubAckPacket.ReasonCodes.Add(MqttUnsubscribeReasonCode.NoSubscriptionExisted);
}
}
}
foreach (var topicFilter in unsubscribePacket.TopicFilters)
{
await _eventDispatcher.SafeNotifyClientUnsubscribedTopicAsync(_clientSession.ClientId, topicFilter).ConfigureAwait(false);
}
return(unsubAckPacket);
}
public async Task <List <MqttUnsubscribeReasonCode> > UnsubscribeAsync(MqttUnsubscribePacket unsubscribePacket)
{
if (unsubscribePacket == null)
{
throw new ArgumentNullException(nameof(unsubscribePacket));
}
var reasonCodes = new List <MqttUnsubscribeReasonCode>();
foreach (var topicFilter in unsubscribePacket.TopicFilters)
{
var interceptorContext = await InterceptUnsubscribeAsync(topicFilter).ConfigureAwait(false);
if (!interceptorContext.AcceptUnsubscription)
{
reasonCodes.Add(MqttUnsubscribeReasonCode.ImplementationSpecificError);
continue;
}
_subscriptionsLock.EnterWriteLock();
try
{
reasonCodes.Add(_subscriptions.Remove(topicFilter)
? MqttUnsubscribeReasonCode.Success
: MqttUnsubscribeReasonCode.NoSubscriptionExisted);
}
finally
{
_subscriptionsLock.ExitWriteLock();
}
}
foreach (var topicFilter in unsubscribePacket.TopicFilters)
{
await _eventDispatcher.SafeNotifyClientUnsubscribedTopicAsync(_clientSession.ClientId, topicFilter).ConfigureAwait(false);
}
return(reasonCodes);
}
