Deserializing messages directly

[Clay Anderson]

I'm looking to build a UI to query, modify and/or retry failed messages. I'd love to show the message type name and a summary of the message utilizing ToString() on the deserialized message. I'm using RabbitMQ.

I can get the raw RabbitMQ messages body via IModel.BasicGet, but I can't get the type:

    BasicGetResult getResult = //call to RabbitMQ

    XDocument xml = XDocument.Parse(Encoding.UTF8.GetString(getResult.Body));

    Type messageType = new MessageUrn(xml.Root.Element("messageType").Value).GetType();

    // fails because my namespace doesn't match the assembly name

Can I use MassTransit to deserialize the bytes into an object if I don't have a Bus receiving from the error queue and I don't know the exact message type at compile time?

Thanks.

[Dru Sellers]

Are you using the XmlSerializer? or the Json or the Binary?

You can try not doing the GetType() and just use the MessageUrn - if its a UI you should just need the string. Eh?

-d

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[Chris Patterson]

The code on how MassTransit resolves messageType to type is in the deserializer code. And it does include the namespace, so you should be able to find it.

[Clay Anderson]

Thanks for the fast responses! I'm using XML serialization.

Using the Message URN directly allows me to show the message type. I just strip out the "urn:message:" part.

But I'd still like to deserialize and call ToString on the deserialized object to get a summary of the message. This works, however, it requires that I know the type at compile time (and it may not be the simplest way to do this).

BasicGetResult getResult = //get from RabbitMQ

MemoryStream bodyStream = new MemoryStream(getResult.Body);

ReceiveContext receive = ReceiveContext.FromBodyStream(bodyStream);

XmlMessageSerializer serializer = new XmlMessageSerializer();

serializer.Deserialize(receive);

IConsumeContext<MyMessageClass> consume;

receive.TryGetContext(out consume);

MyMessageClass message = consume.Message;

I saw some information about using Magnum's FastInvoke to invoke a generic method with a type determined at run-time. However, I'm not able to get the type at run-time as the message urn doesn't contain the assembly name, only the namespace.

    BasicGetResult getResult = //call to RabbitMQ

    XDocument xml = XDocument.Parse(Encoding.UTF8.GetString(getResult.Body));

    Type messageType = new MessageUrn(xml.Root.Element("messageType").Value).GetType();

    // fails because my namespace doesn't match the assembly name

I can have an assembly per namespace, which should allow MessageUrn.GetType() to work. Or, I can use reflection to scan all the loaded types to look for the match. Is there another way?

Thanks.

Clay

[Dru Sellers]

Yeah - that's probably not going to work, because you would have to have EVERY message type available. Better off (probably) just showing the XML form. :(

-d

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[Clay Anderson]

Thanks Dru,

We went with just showing the message type (instead of ToString) in our summary page. It doesn't need to be too fancy as we're hoping that the error queue doesn't need managed much.

Clay

-d

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[Dru Sellers]

:)

I look forward to hearing about how it eventually get's used in anger. ;)

-d

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