Introducing Bob: middleware chaining for RoundTrippers

[sjlee]

I'd like to offer an important addition to Alice: middleware chaining for http.RoundTrippers. We love Alice and use it for chaining http.Handler middleware. At the same time, working in a router area, we feel the same strong need to be able to chain http.RoundTripper middleware pieces (client-side) declaratively.

Fortunately, the mechanism of Alice can be easily extended to support http.RoundTripper. We thought that we would offer the PR to Alice instead of keeping it on our end. Let me know what you guys think. Thanks!

[justinas]

Hi @sjlee,

Thanks for the PR! This is the first time that I have encountered the middleware pattern on RoundTripper. In fact, it is my first time seeing custom RoundTripper utilized at all.

However, I am trying to keep Alice as lean as possible and this would probably be best suited for a separate project. Let me know what you think about that.

The name bob is 💯 though 😄

[sjlee]

Thanks for the response @justinas. The RoundTripper is very much in the HTTP handling picture, on the client side of things.

All things being equal, I would love this to be part of alice rather than a separate repo. I could of course create a new repo for this, but I wanted to give this to alice as this is heavily inspired by alice and it's a symmetric feature. Any chance I could convince you to change your mind on this?

[han-so1omon]

Has this been merged and if so how is it used? Roundtripping is recommended here as a way to log http requests