private void RegisterMessageProcessor(IConsumerClient client)
{
client.OnMessageReceived += async (sender, transportMessage) =>
{
_logger.MessageReceived(transportMessage.GetId(), transportMessage.GetName());
long? tracingTimestamp = null;
try
{
tracingTimestamp = TracingBefore(transportMessage, _serverAddress);
var name = transportMessage.GetName();
var group = transportMessage.GetGroup();
Message message;
var canFindSubscriber = _selector.TryGetTopicExecutor(name, group, out var executor);
try
{
if (!canFindSubscriber)
{
var error = $"Message can not be found subscriber. Name:{name}, Group:{group}. {Environment.NewLine} see: https://github.com/dotnetcore/CAP/issues/63";
var ex = new SubscriberNotFoundException(error);
TracingError(tracingTimestamp, transportMessage, client.BrokerAddress, ex);
throw ex;
}
var type = executor.Parameters.FirstOrDefault(x => x.IsFromCap == false)?.ParameterType;
message = await _serializer.DeserializeAsync(transportMessage, type);
}
catch (Exception e)
{
transportMessage.Headers.Add(Headers.Exception, nameof(SerializationException) + "-->" + e.Message);
if (transportMessage.Headers.TryGetValue(Headers.Type, out var val))
{
var dataUri = $"data:{val};base64," + Convert.ToBase64String(transportMessage.Body);
message = new Message(transportMessage.Headers, dataUri);
}
else
{
var dataUri = "data:UnknownType;base64," + Convert.ToBase64String(transportMessage.Body);
message = new Message(transportMessage.Headers, dataUri);
}
}
if (message.HasException())
{
var content = StringSerializer.Serialize(message);
_storage.StoreReceivedExceptionMessage(name, group, content);
client.Commit(sender);
try
{
_options.FailedThresholdCallback?.Invoke(new FailedInfo
{
ServiceProvider = _serviceProvider,
MessageType = MessageType.Subscribe,
Message = message
});
_logger.ConsumerExecutedAfterThreshold(message.GetId(), _options.FailedRetryCount);
}
catch (Exception e)
{
_logger.ExecutedThresholdCallbackFailed(e);
}
TracingAfter(tracingTimestamp, transportMessage, _serverAddress);
}
else
{
var mediumMessage = _storage.StoreReceivedMessage(name, group, message);
mediumMessage.Origin = message;
client.Commit(sender);
TracingAfter(tracingTimestamp, transportMessage, _serverAddress);
_dispatcher.EnqueueToExecute(mediumMessage, executor);
}
}
catch (Exception e)
{
_logger.LogError(e, "An exception occurred when process received message. Message:'{0}'.", transportMessage);
client.Reject(sender);
TracingError(tracingTimestamp, transportMessage, client.BrokerAddress, e);
}
};
client.OnLog += WriteLog;
}