No mechanism for middleware to identify which service/operation a request is for

[jonhoo]

I'm currently writing a Smithy middleware that allows applying per-operation timeouts. That is, when constructed, the user can supply something like:

{
  "SomeService/this_op": 1000,
  "SomeService/other_op": 86400,
  "SomeService/*": 5000,
  "SomeOtherService/that_op": 50
}

and the middleware ensures that the right timeout is applied for each request.

Unfortunately, at the moment, doing so isn't possible (as far as I can tell) because middleware only receive a aws_smithy_http::operation::Request consisting of a http::Request<SdkBody> and a SharedPropertyBag, neither of which include the service/operation metadata, which is discarded here:
https://github.com/awslabs/smithy-rs/blob/c5c87be5e684704bf8fdb31e62e5e5c1b37531a8/rust-runtime/aws-smithy-http-tower/src/parse_response.rs#L103-L107

So, my plea: can Metadata be included in the SharedPropertyBag of a Request? Or, alternatively, can the service and operation name be otherwise added to the property bag or Request through some other mechanism so that this use-case becomes possible?

[Velfi]

This was added a while back but we never closed the ticket until now.