chore: introduce buf for code generation

[imcom]

I would like to introduce the usage of buf with gobgp project. The tool can help to maintain and generate code from .proto files

[fujita]

Can force the specific version of protoc?

[imcom]

Can force the specific version of protoc?

I believe the unknown version comes from this replacement

It has its own complier, the only difference I see now is the unknown tag in generated code. Anything else should I pay attention to ?

[imcom]

more information as follows:
https://docs.buf.build/build/internal-compiler

[fujita]

Do you propose replacing protoc with this tool?

[imcom]

Do you propose replacing protoc with this tool?

The buf project is getting more and more attention from the community and does provide more tooling stuff than protoc, not quite a replacement for the use of protoc in gobgp project but at least it is an option when people try to build and develop gobgp.

I do see the tool's lint reports many concerns we do not want/have to adopt at the moment. protoc and buf can coexist with no harm.

[fujita]

buf might generate code slightly different from protoc, right? Then if someone submit a pull request including the code generated by buf, it's supposed to be rejected. We don't need pointless changes of *.pb.go, right?

[imcom]

buf might generate code slightly different from protoc, right? Then if someone submit a pull request including the code generated by buf, it's supposed to be rejected. We don't need pointless changes of *.pb.go, right?

I got your point, although buf claims to be just as same as protoc. The additional risk is true, as you said. I believe we can keep this pull request open for a prolonged evaluation/observation of buf project and continue our discussion from there. Sounds good?

[fujita]

sure, let this pr open.