protoc-gen-openapi

A protoc/buf plugin to generate compatible OpenAPI version 3.0.0 YAML files from protobuf HTTP API declarations.

Features

This plugin provides an easy way of generating OpeAPI specification of an HTTP service API directly from its protobuf file. It uses protobuf annotation options to allow the user define details about the service and its endpoints.

It can be used alone or together with the protoc-gen-mikros-extensions plugin for messages and field names.

Installation and usage into projects

To install the plugin latest version and use it in your projects, use the command:

go install github.com/mikros-dev/protoc-gen-mikros-openapi@latest

Assuming that a project is using buf tool to compile and manage protobuf files, this plugin can be used the following way:

Note: We assume buf version 2 here, if you're using version 1, use buf docs to check how to set a local plugin (or to migrate your settings to version 2).

• Edit your buf.gen.yaml file, in the plugins section and add the following excerpt:

plugins:
  - local: protoc-gen-mikros-openapi
    out: gen # Where your generated files will be
    opt:
      - settings=extensions_settings.toml # The file name of your plugin settings

• Edit the buf.yaml file, in the deps section, add the following excerpt:

deps:
  - buf.build/mikros-dev/protoc-gen-mikros-openapi

• Execute the command:

buf dep update

Building and installing locally

In order to compile and install the plugin locally you'll need to follow the steps:

• Install the go compiler;
• Execute the commands:
  • go generate
  • go build && go install

Protobuf extensions available

The following links present details about available options to be used from a protobuf file.

• File
• Service
• Method
• Message
• Field

For more details or a complete example, use the examples directory.

License

Apache License 2.0