NOTE: This repo is inspired from this repo

When you have both protoc and protoc-gen-grpc-web installed, you can now run this command:

$ protoc -I=. ping_pong.proto \
  --js_out=import_style=commonjs:. \
  --grpc-web_out=import_style=commonjs,mode=grpcwebtext:.

After the command runs successfully, you should now see two new files generated in the current directory:

• ping_pong_pb.js: this contains the PingRequest and PongResponse classes
• ping_pong_grpc_web_pb.js: this contains the PingPongServiceClient class

We are ready to run the Hello World example. The following set of commands will run the 3 processes all in the background.

1. Install required node modules.

$ yarn install

1. Run the NodeJS gRPC Service. This listens at port :8080.

$ node server.js &

2. Run the Envoy proxy. The envoy.yaml file configures Envoy to listen to browser requests at port :9090, and forward them to port :8080

$ docker build -t envoy-grpc .
$ docker run -p 9090:9090 envoy-grpc

3. When these are all ready, you can open another terminal window and run

yarn start

Open up the Expo app on Android or iOS and scan the QR code. Push the GRPC button and the terminal windows for the client and server should say Pong and Request respectively