Example of lua-resty-grpc-gateway

This is grpc-web gateway example with helloworld.

Requirements

• Go (gRPC backend app)
• nodejs (gRPC frontend app)
• protoc related commands (protobuf, protoc-gen-grpc-web)
• Docker and docker-compose

How to build

Build protbuf and backend app

make all

Run backend and gateway container via docker-compose

docker-compose up -d --build

The gateway container run on :9000, and you cannot access to backend app without gateway.

Run client server

Client uses simple grpc-web interface.

cd client
yarn install
yarn start

The client app will start on :8080, and will open browser automatically. If grpc-web request sent successfully (maybe it's not due to browser implementation), you can see Hello, grpc-web with gateway! message in content.

Get gRPC response via REST interface

gateway container also accepts REST interface:

curl -vv -H "Content-Type: application/json" -d '{"displayName":"grpc-rest", "ex":[{"displayName":"test", "foo":{"grades":[1,2,3]}}, {"displayName":"test2","foo":{"grades":[97,98,99]}}], "jobs":["A","B"], "color":"BLUE"}' "http://localhost:9000/rest"
>> {"reply_at":{"seconds":1575473082,"nanos":0},"message":"Hello, grpc-rest!"}

This response is made through the gateway as REST, proxy to backend with gRPC request, and transform to JSON.