twirp-openapi-gen

A Twirp RPC OpenAPI generator implemented as protoc plugin

Currently supports only OpenAPI 2.0

Usage

Installing the generator for protoc/buf:

go install github.com/albenik/twirp-openapi-gen/cmd/protoc-gen-twirp-openapi@latest

Run whith the protoc

protoc -twirp-openapi_out=api/foo -twirp-openapi_opt=hostname=api.example.com,path_prefix=/api/v1 rpc/service.proto

Run with buf.build:

buf.gen.yaml:

version: v1
plugins:
  - name: twirp-openapi
    out: api/foo
    opt:
     - hostname=api.example.com
     - path_prefix=/api/v1

Motivation

The only working generator referenced by Twirp project and found by me is go-bridget/protoc-gen-twirp_swagger. It lacks support of map (at least) and also does not work with advanced buf configuration when buf.work.yaml and buf.gen.yaml placed on the different levels.

I started from a PR to the original go-bridget/twirp-swagger-gen but later decided to write generator from scratch. I dropped stadalone proto parser package and just rely on already parsed structure from protogen. Also I don't use OpenAPI spec go-package and replaced it by hand-written structures, which are incomplete buf much more comfortable to use.

The generated output is suitable for Swagger-UI.