void HandleInternal(IMessage message, IMessagingSource sender)
{
IChannelHandlerContext context = this.capturedContext;
try
{
Contract.Assert(message != null);
PerformanceCounters.MessagesReceivedPerSecond.Increment();
this.PublishToClientAsync(context, message, sender).OnFault(ShutdownOnPublishFaultAction, context);
message = null;
}
catch (MessagingException ex)
{
this.ShutdownOnReceiveError(ex);
}
catch (Exception ex)
{
ShutdownOnError(context, ReceiveProcessingScope, ex);
}
finally
{
message?.Payload.SafeRelease();
}
}
public AckPendingMessageState(IMessage message, IMessagingSource callback, PublishPacket packet)
{
this.SequenceNumber = message.SequenceNumber;
this.PacketId = packet.PacketId;
this.QualityOfService = packet.QualityOfService;
this.FeedbackChannel = new MessageFeedbackChannel(message.Id, callback);
this.StartTimestamp = PreciseTimeSpan.FromStart;
}
public void RegisterSource(IMessagingSource source)
{
{
this.sources.Add(source);
if (this.messagingChannel != null)
{
source.BindMessagingChannel(this.messagingChannel);
}
}
}
void IMessagingChannel.Handle(IMessage message, IMessagingSource callback)
{
if (this.capturedContext.Executor.InEventLoop)
{
this.HandleInternal(message, callback);
}
else
{
this.capturedContext.Executor.Execute((s, m) => this.HandleInternal((IMessage)m, (IMessagingSource)s), callback, message);
}
}
async Task PublishToClientQos2Async(IChannelHandlerContext context, IMessage message, IMessagingSource callback, PublishPacket packet)
{
await Qos2Semaphore.WaitAsync(this.lifetimeCancellation.Token); // this ensures proper ordering of messages
Task deliveryTask;
try
{
int packetId = packet.PacketId;
IQos2MessageDeliveryState messageInfo = await this.qos2StateProvider.GetMessageAsync(this.identity, packetId);
if (messageInfo != null && message.SequenceNumber != messageInfo.SequenceNumber)
{
await this.qos2StateProvider.DeleteMessageAsync(this.identity, packetId, messageInfo);
messageInfo = null;
}
if (messageInfo == null)
{
deliveryTask = this.publishPubRecProcessor.SendRequestAsync(context, packet,
new AckPendingMessageState(message, callback, packet));
}
else
{
deliveryTask = this.PublishReleaseToClientAsync(context, packetId, new MessageFeedbackChannel(message.Id, callback), messageInfo, PreciseTimeSpan.FromStart);
}
}
finally
{
try
{
this.Qos2Semaphore.Release();
}
catch (ObjectDisposedException)
{ }
}
await deliveryTask;
}
Task PublishToClientQos1Async(IChannelHandlerContext context, IMessage message, IMessagingSource callback, PublishPacket packet)
{
return(this.publishPubAckProcessor.SendRequestAsync(context, packet,
new AckPendingMessageState(message, callback, packet)));
}
Task PublishToClientQos0Async(IChannelHandlerContext context, IMessage message, IMessagingSource callback, PublishPacket packet)
{
if (message.DeliveryCount == 0)
{
return(Task.WhenAll(
callback.CompleteAsync(message.Id),
Util.WriteMessageAsync(context, packet)));
}
else
{
return(callback.CompleteAsync(message.Id));
}
}
static async Task RejectMessageAsync(string messageId, IMessagingSource callback)
{
await callback.RejectAsync(messageId); // awaiting guarantees that we won't complete consecutive message before this is completed.
PerformanceCounters.MessagesRejectedPerSecond.Increment();
}
async Task PublishToClientAsync(IChannelHandlerContext context, IMessage message, IMessagingSource callback)
{
PublishPacket packet = null;
try
{
using (message)
{
message.Properties[TemplateParameters.DeviceIdTemplateParam] = this.DeviceId;
QualityOfService qos;
QualityOfService maxRequestedQos;
if (this.TryMatchSubscription(message.Address, message.CreatedTimeUtc, out maxRequestedQos))
{
qos = Util.DeriveQos(message, this.settings, this.ChannelId, this.Id);
if (maxRequestedQos < qos)
{
qos = maxRequestedQos;
}
}
else
{
// no matching subscription found - complete the message without publishing
await RejectMessageAsync(message.Id, callback);
return;
}
packet = Util.ComposePublishPacket(context, message, qos, context.Channel.Allocator);
switch (qos)
{
case QualityOfService.AtMostOnce:
await this.PublishToClientQos0Async(context, message, callback, packet);
break;
case QualityOfService.AtLeastOnce:
await this.PublishToClientQos1Async(context, message, callback, packet);
break;
case QualityOfService.ExactlyOnce:
if (this.maxSupportedQosToClient >= QualityOfService.ExactlyOnce)
{
await this.PublishToClientQos2Async(context, message, callback, packet);
}
else
{
throw new ProtocolGatewayException(ErrorCode.QoSLevelNotSupported, "Requested QoS level is not supported.");
}
break;
default:
throw new ProtocolGatewayException(ErrorCode.QoSLevelNotSupported, "Requested QoS level is not supported.");
}
}
this.lastClientActivityTime = DateTime.UtcNow; // note last client activity - used in handling disconnects on keep-alive timeout
}
catch (Exception ex)
{
ReferenceCountUtil.SafeRelease(packet);
ShutdownOnError(context, "<- PUBLISH", ex);
}
}
public MessageFeedbackChannel(string messageId, IMessagingSource callback)
{
this.messageId = messageId;
this.callback = callback;
}
