protected void DeserializeMessage(TMessage msg, out MessageWithHeaders requestMessage, out string requestId, out DateTimeOffset?expires, out object message)
{
var msgPayload = _messagePayloadProvider(msg);
requestMessage = null;
requestId = null;
expires = null;
_logger.LogDebug("Deserializing message...");
message = _consumerSettings.IsRequestMessage
? _messageBus.DeserializeRequest(_consumerSettings.MessageType, msgPayload, out requestMessage)
: _messageBus.Settings.Serializer.Deserialize(_consumerSettings.MessageType, msgPayload);
if (requestMessage != null)
{
requestMessage.TryGetHeader(ReqRespMessageHeaders.RequestId, out requestId);
requestMessage.TryGetHeader(ReqRespMessageHeaders.Expires, out expires);
}
}
public virtual async Task ProcessMessage(TMessage msg)
{
var msgPayload = _messagePayloadProvider(msg);
MessageWithHeaders requestMessage = null;
string requestId = null;
DateTimeOffset? expires = null;
_log.Debug("Deserializing message...");
var message = _consumerSettings.IsRequestMessage
? _messageBus.DeserializeRequest(_consumerSettings.MessageType, msgPayload, out requestMessage)
: _messageBus.Settings.Serializer.Deserialize(_consumerSettings.MessageType, msgPayload);
if (requestMessage != null)
{
requestMessage.TryGetHeader(ReqRespMessageHeaders.RequestId, out requestId);
requestMessage.TryGetHeader(ReqRespMessageHeaders.Expires, out expires);
}
// Verify if the request/message is already expired
if (expires.HasValue)
{
var currentTime = _messageBus.CurrentTime;
if (currentTime > expires.Value)
{
_log.WarnFormat(CultureInfo.InvariantCulture, "The message arrived too late and is already expired (expires {0}, current {1})", expires.Value, currentTime);
try
{
// Execute the event hook
(_consumerSettings.OnMessageExpired ?? _messageBus.Settings.OnMessageExpired)?.Invoke(_consumerSettings, message);
}
catch (Exception eh)
{
// When the hook itself error out, catch the exception
_log.ErrorFormat(CultureInfo.InvariantCulture, "{0} method failed", eh, nameof(IConsumerEvents.OnMessageExpired));
}
// Do not process the expired message
return;
}
}
object response = null;
string responseError = null;
var consumerInstance = await _instancesQueue.ReceiveAsync(_messageBus.CancellationToken).ConfigureAwait(false);
try
{
if (_consumerWithContext && _consumerContextInitializer != null)
{
var consumerContext = new ConsumerContext();
_consumerContextInitializer(msg, consumerContext);
var consumerWithContext = (IConsumerContextAware)consumerInstance;
consumerWithContext.Context.Value = consumerContext;
}
// the consumer just subscribes to the message
var task = _consumerRuntimeInfo.OnHandle(consumerInstance, message);
await task.ConfigureAwait(false);
if (_consumerSettings.ConsumerMode == ConsumerMode.RequestResponse)
{
// the consumer handles the request (and replies)
response = _consumerRuntimeInfo.GetResponseValue(task);
}
}
catch (Exception e)
{
if (_consumerSettings.ConsumerMode == ConsumerMode.RequestResponse)
{
_log.ErrorFormat(CultureInfo.InvariantCulture, "Handler execution failed", e);
// Save the exception
responseError = e.ToString();
}
else
{
_log.ErrorFormat(CultureInfo.InvariantCulture, "Consumer execution failed", e);
}
try
{
// Execute the event hook
(_consumerSettings.OnMessageFault ?? _messageBus.Settings.OnMessageFault)?.Invoke(_consumerSettings, message, e);
}
catch (Exception eh)
{
// When the hook itself error out, catch the exception
_log.ErrorFormat(CultureInfo.InvariantCulture, "{0} method failed", eh, nameof(IConsumerEvents.OnMessageFault));
}
}
finally
{
await _instancesQueue.SendAsync(consumerInstance).ConfigureAwait(false);
}
if (response != null || responseError != null)
{
// send the response (or error response)
_log.DebugFormat(CultureInfo.InvariantCulture, "Serializing the response {0} of type {1} for RequestId: {2}...", response, _consumerSettings.ResponseType, requestId);
var responseMessage = new MessageWithHeaders();
responseMessage.SetHeader(ReqRespMessageHeaders.RequestId, requestId);
responseMessage.SetHeader(ReqRespMessageHeaders.Error, responseError);
await _messageBus.ProduceResponse(message, requestMessage, response, responseMessage, _consumerSettings).ConfigureAwait(false);
}
}
