rails_grpc

rails_grpc: gRPC for Ruby on Rails

gRPC for Ruby on Rails

Feature

• Add Autoreload protobuf definition feature in development mode
• Grpc Rails Server
• Add some useful grcp function

Installation

Add this line to your application's Gemfile:

gem 'rails_grpc'
gem "google-protobuf", git: "[e-mail]:nishio-dens/protobuf.git", branch: "rails-grpc", glob: "ruby/google-protobuf.gemspec"

And then execute:

$ bundle

Directory Structure

/proto

You need to put the protobuf definition in Rails.root/proto dir.

$ tree proto
proto
├── ec.deep.proto
├── ec.proto
└── other.proto

/grpc

You need to be careful about the location of grpc service, lib, and model files.

# current working dir is Rails.root

$ tree grpc

grpc
├── lib
│   ├── ec.deep_pb.rb
│   ├── ec.deep_services_pb.rb
│   ├── ec_pb.rb
│   ├── ec_services_pb.rb
│   └── other_pb.rb
├── models
│   └── ec
│       └── product.rb
└── services
    └── product_service.rb

lib files is the protobuf autogenerate files.

models is a models that you want to extend protobuf models.

services is the protobuf service files.

example models

# grpc/models/ec/product.rb

# You can extend Ec::Product models
class Ec::Product
  PORT = "127.0.0.1:8080"

  def self.all
    service = Ec::ProductService::Stub.new(PORT, :this_channel_is_insecure)
    req = Ec::GetProductsRequest.new
    res = service.get_products(req)

    res.products
  end

  def self.find(id)
    service = Ec::ProductService::Stub.new(PORT, :this_channel_is_insecure)
    req = Ec::GetByProductIdRequest.new(product_id: id)
    res = service.get_by_product_id(req)

    res.product
  end
end

example services

# grpc/services/product\_service.rb

module Grpc
  class ProductService < Ec::ProductService::Service
    def get_products(req, _call)
      products = Product.all
      Ec::GetProductsResponse.new(products: products.map(&:to_proto))
    end

    def get_by_product_id(req, _call)
      product = Product.find_by(id: req.product_id)
      if product.present?
        Ec::GetByProductIdResponse.new(product: product.to_proto)
      else
        fail GRPC::BadStatus.new_status_exception(
          GRPC::Core::StatusCodes::ABORTED,
          "product #{req.product_id} not found"
        )
      end
    end
  end
end

Compile Protoc

First, you put protobuf definition in /proto dir, and you need to run compile command.

bundle exec rake protoc:compile

Development

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/nishio-dens/rails_grpc. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.

License

The gem is available as open source under the terms of the MIT License.

Code of Conduct

Everyone interacting in the RailsGrpc project’s codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.