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RohitRox/echo.proto

Created May 8, 2021 13:17
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A gRPC example in Golang
Raw
echo.proto
syntax = "proto3";
option go_package = "protos/";
message Msg {
string Text = 1;
}
service Echo {
rpc Hello(Msg) returns(Msg);
}
Raw
echoclient.go
package main
import (
"context"
"log"
"grpc-sample/protos"
"google.golang.org/grpc"
)
func main() {
conn, err := grpc.Dial("localhost:9000", grpc.WithInsecure())
if err != nil {
log.Fatalf("did not connect: %v", err)
}
defer conn.Close()
client := protos.NewEchoClient(conn)
msg := &protos.Msg{
Text: "Pinging",
}
resp, err := client.Hello(context.Background(), msg)
if err != nil {
log.Fatalf("could not greet: %v", err)
}
log.Printf("Received: %v", resp)
}
Raw
echoserver.go
package main
import (
"context"
"fmt"
"grpc-sample/protos"
)
type EchoServer struct {
protos.UnimplementedEchoServer
}
func (es *EchoServer) Hello(c context.Context, m *protos.Msg) (respMsg *protos.Msg, err error) {
txt := fmt.Sprintf("Echo: %s", m.Text)
respMsg = &protos.Msg{
Text: txt,
}
return
}
Raw
go.mod
module grpc-sample
go 1.16
require (
github.com/golang/protobuf v1.5.2 // indirect
google.golang.org/grpc v1.37.0
google.golang.org/protobuf v1.26.0
)
Raw
go.sum
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Raw
main.go
package main
import (
"net"
"log"
"grpc-sample/protos"
"google.golang.org/grpc"
"google.golang.org/grpc/reflection"
)
func main() {
grpcServer := grpc.NewServer()
echoServer := &EchoServer{
}
protos.RegisterEchoServer(grpcServer, echoServer)
reflection.Register(grpcServer)
lis, err := net.Listen("tcp", ":9000")
if err != nil {
log.Fatalf("failed to listen: %v", err)
}
log.Println("gRPC server starting at :9000")
if err := grpcServer.Serve(lis); err != nil {
log.Fatalf("failed to serve: %s", err)
}
}
@RohitRox
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Author

RohitRox commented May 8, 2021

NOTE: move echoclient.go inside a folder, otherwise there will be two main programs in the same packgae

System Req:

  # Instructions for Mac OS
  # You can find similar package for your OS
  brew install protobuf # protocol buffer compiler; protoc
  brew install protoc-gen-grpc-web # protoc plugin that generates code for gRPC-Web clients
  brew install grpcurl # curl for gRPC servers

Download Deps:

  go mod download

Compile Proto:

  protoc -I ./ *.proto --go_out=. --go-grpc_out=. 
  # generates compiled files in protos dir

Run server:

  go run .

Use grpcurl to test:

  grpcurl --plaintext -d '{"Text": "Hellp Grpc"}' localhost:9000 Echo.Hello

Run the client:

  # Inside the folder where you put echoclient.go
  go run echoclient.go

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