是否可以向ServiceStack Redis消息中添加自定义标头？

Question

When a message is sent to Redis using ServiceStack, the framework adds all the standard headers ( Priority , CreatedDate , ...). However, is it possible to add any custom headers to that message? I've got a set of microservices that pass messages amongst each other, and I'd like to include a shared header.

So far, I have explored implementing my own version of IMessage or IMessageFactory, and I've looked at the different properties within RedisMqServer when boostrapping it in the IOC container, but I have yet to find anywhere I can add a new header.

Thanks in advance!

Answer 1

You could use the IMessage.Tag to send any user defined tag text, eg:

using (var mqClient = mqServer.CreateMessageQueueClient())
{
    mqClient.Publish(new Message<HelloIntro>(new Hello { Name = "World" }) {
        Tag = "Custom"
    });
}

Otherwise I've just added support for sending Custom Headers in this commit which will now also let you send Custom Headers in the new IMessage.Meta string Dictionary, eg:

using (var mqClient = mqServer.CreateMessageQueueClient())
{
    mqClient.Publish(new Message<HelloIntro>(new Hello { Name = "World" }) {
        Meta = new Dictionary<string, string> { { "Custom", "Header" } }
    });
}

Which you can access in your MQ RegisterHandler , eg:

mqServer.RegisterHandler<Hello>(m =>
    new Message<HelloResponse>(new HelloResponse { 
        Result = "Hello, {0}!".Fmt(m.GetBody().Name) 
    }) { 
        Meta = m.Meta 
    });

Your MQ Handler can also now return an IMessage response which allows full round-tripping of any custom headers.

This change is available from v4.0.57 that's now available on MyGet .