public static void Publish(string subject, MicroserviceMessage message)
{
// validate params
if (string.IsNullOrWhiteSpace(subject))
{
throw new ArgumentNullException(nameof(subject));
}
if (message == null)
{
throw new ArgumentNullException(nameof(message));
}
// serialize the message
var serializedMessage = JsonConvert.SerializeObject(message);
// send the message
_connection.Publish(subject, Encoding.UTF8.GetBytes(serializedMessage));
}
public static async Task <MicroserviceMessage> RequestAsync(string subject, MicroserviceMessage message)
{
// validate params
if (string.IsNullOrWhiteSpace(subject))
{
throw new ArgumentNullException(nameof(subject));
}
if (message == null)
{
throw new ArgumentNullException(nameof(message));
}
// serialize the message
var serializedMessage = JsonConvert.SerializeObject(message);
// send the message
var response = await _connection.RequestAsync(subject, Encoding.UTF8.GetBytes(serializedMessage)).ConfigureAwait(false);
// return the response as a Microservice message
return(response.Data.ToMicroserviceMessage());
}
public async void HandleMsgWith <T>(object sender, MsgHandlerEventArgs e) where T : IMessageHandler
{
// store the replyTo subject
var replyTo = e.Message.Reply;
// deserialize the microservice msg that was embedded in the nats msg
var microserviceMsg = e.Message.Data.ToMicroserviceMessage();
MicroserviceMessage responseMsg = null;
try
{
// create a new scope to handle the message in. this will create a new instance of the handler class per message
using (var scope = _serviceScopeFactory.CreateScope())
{
// create a new instance of the message handler
var msgHandler = scope.ServiceProvider.GetService <T>();
// handle the message
responseMsg = await msgHandler.HandleAsync(microserviceMsg).ConfigureAwait(false);
}
}
catch (Exception ex)
{
microserviceMsg.ErrorMessage = ex.GetBaseException().Message;
microserviceMsg.ResponseStatusCode = 500;
Log.Error(microserviceMsg.ErrorMessage);
}
finally
{
// send the NATS message (with the response) back to the calling client
if (null != responseMsg && !string.IsNullOrWhiteSpace(replyTo))
{
NatsHelper.Publish(replyTo, responseMsg);
}
}
}
public static Task <MicroserviceMessage> RequestAsync(MicroserviceMessage message)
{
return(RequestAsync(message.Subject, message));
}
public static void Publish(MicroserviceMessage message)
{
Publish(message.Subject, message);
}
public static byte[] ToBytes(this MicroserviceMessage msg, JsonSerializerSettings serializerSettings)
{
var serializedMessage = JsonConvert.SerializeObject(msg, serializerSettings);
return(Encoding.UTF8.GetBytes(serializedMessage));
}
