Disclaimer: this is just a thing I slapped together, this is not supported and is just for fun. Try it out though!

This is a protoc plugin that generates a basic CRUD service proto for messages of the input protos. I made this because I was tired of writing the same boilerplate request/response messages and service methods for simple APIs.

I also wanted to play around with the rich descriptor facilities of protoreflect in the context of building a protoc plugin.

You can either install the plugin directly:

$ go get github.com/noahdietz/lazyrpc/cmd/protoc-gen-lazyrpc

Or build it from source:

$ cd $GOPATH/src
$ mkdir -p github.com/noahdietz
$ cd github.com/noahdietz
$ git clone https://github.com/noahdietz/lazyrpc.git
$ cd lazyrpc/cmd/protoc-gen-lazyrpc
$ go get
$ go install 

The configuration of lazyrpc generation is defined using proto Message options. The option available options are as follows:

• Methods: a list of methods to generate for this message's service
  • Supported methods are: CREATE, GET, LIST, UPDATE, DELETE
• Key: a single field name for use as a key in get & delete methods.
  • Omission of this phrase results in the entire message being used as input

Example:

import "lazy.proto"

...

message Todo {
  option (lazy.config) = {
    methods: [CREATE, GET, LIST, UPDATE, DELETE]
    key: "id"
  };
  
  int32 id = 1;
  string task = 2;
  bool done = 3;
}

A message without a lazy.config.methods field will be ignored entirely.

The extension defintion can be found in proto/lazy.proto.

The compiled Go definition can be imported as github.com/noahdietz/lazyrpc/config and found in config/lazy.pb.go.

Invoke the plugin like any other protoc plugin:

export LAZY_RPC_PROTOS=$GOPATH/src/github.com/noahdietz/lazyrpc/protos
$ protoc -I $LAZY_RPC_PROTOS -I my/protos/ --lazyrpc_out my/protos/ my/protos/a.proto

A proto file is created for each input proto, containing all of the services & request/response messages for the messages defined & configured in the input.

This generated proto file takes the name {input file}_service.proto. For example, using todo.proto as input, a todo_service.proto file is generated.

Note: currently, files will be overwritten

In the future, lazyrpc could support:

• configuration for streaming method generation
• plugin option to signal merging of services/messages as an alternative to overwritting existing files