private Task <string> HandlePubResponse(short packetId)
{
PendingPublishMessage pendingMessage = DequeueMessage <PendingPublishMessage>(packetId);
string result = pendingMessage == null ? null : ((PendingPublishMessage)pendingMessage).MessageId;
return(Util.RunSynchronously <string>(() => result));
}
void IMqttSession.Publish(string messageId, MqttQos qos)
{
var publish = new PendingPublishMessage(1, messageId, qos);
//WARNING: Something you may not expect
//SetResult will transfer control to a waiter if there is one. We need to get our queue straight before that happens
//Or else whack shit goes wrong. So don't go thinking "it's prettier to see if the queue is empty before queueing".
//Not that this was ever coded that way or anything...
pendingMessages.Enqueue(publish);
//If this is the first message, signal.
if (pendingMessages.Count == 1 && pendingMessageCompletionSource != null)
{
TaskCompletionSource <PendingMessage> source = pendingMessageCompletionSource;
pendingMessageCompletionSource = null;
source.SetResult(publish);
}
if (qos == MqttQos.BestEffort)
{
pendingMessages.Enqueue(new PendingPubRelMessage(1));
}
}
