REST Application demonstrating GRPC usage in Go

Folder structure

• /cmd: contains local app main function
• /rpc: contains /service which is the implementation of the generated protobuf server interface. And /client containing a client-connection helper
• /handler: contains http.Handlers that invoke the remote grpc functions via the client-connection
• /proto contains the rpc .proto file and generated interfaces

Usage:

The RPC server exposes a simple user management API

Start rpc server

go run ./rpc/service

Start app server

 go run ./cmd/app.go

Create user

curl --location --request POST 'localhost:8081/api/user/create' \
--header 'Content-Type: application/json' \
--data-raw '{
    "Name":"Adam",
    "Age":10
}'

Fetch all users

curl --location --request GET 'localhost:8081/api/users'

Fetch single user by ID

curl --location --request GET 'localhost:8081/api/user?user_id=8f37caae-a76d-45b8-8cb4-be79c21f6ef1'

To regenerate rpc code from .proto file (you must have grpc setup locally)

protoc --go_out=. --go_opt=paths=source_relative     --go-grpc_out=. --go-grpc_opt=paths=source_relative     ./proto/def.proto