proposal: enable configuring of AWS SDK Go v2 through config.LoadOptionsFunc

[dcarbone]

I have a scenario where it would be prefrable to be able to apply the DataDog tracing middleware through the use of a config.LoadOptionsFunc that can be provided to the config.LoadDefaultConfig func.

I will have a PR with an intial pass at this work inbound shortly.

[rarguelloF]

Hi @dcarbone 👋 and thanks for opening this issue.

While we take a closer look at your proposal and PR, could you please provide us more context on why the existing AppendMiddleware doesn't fit in your use-case? (having some code example would be great to better understand the problem).

[dcarbone]

This is a more idiomatic way of adding config options.

Why pass the entire config object to you? You don't need to know / care about the actual conf instance itself. All you need is to provide a function that complies with the LoadOptionsFunc signature defined by the upstream aws config package and be done with it.