Adds simple RPC example.

README.md

@@ -1,2 +1,10 @@
 # golang-rpc-example
-Example of how to make an RPC using golang
+Simple server and client that communicate using Go's RPC library.
+
+Start the server with:
+
+    go run server.go
+
+Then start the client with:
+
+    go run client.go --factor1=12 --factor2=13

client.go

@@ -0,0 +1,33 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"log"
+	"net/rpc"
+
+	"github.com/zeptonaut/golang-rpc-example/service"
+)
+
+var server = flag.String("server_port", "localhost:9999", "Address at which to reach the server.")
+var factor1 = flag.Int("factor1", 3, "First factor to multiply.")
+var factor2 = flag.Int("factor2", 4, "Second factor to multiply.")
+
+func main() {
+	flag.Parse()
+
+	client, err := rpc.DialHTTP("tcp", *server)
+	if err != nil {
+		log.Fatal("dialing: ", err)
+	}
+
+	request := &service.MultiplicationRequest{*factor1, *factor2}
+	response := new(service.MultiplicationResponse)
+
+	err = client.Call("MultiplicationService.Multiply", request, &response)
+	if err != nil {
+		log.Fatal("MultiplicationService error:", err)
+	}
+
+	fmt.Println(response.Product)
+}

server.go

@@ -0,0 +1,31 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"log"
+
+	"net"
+	"net/http"
+	"net/rpc"
+
+	"github.com/zeptonaut/golang-rpc-example/service"
+)
+
+var port = flag.Int("port", 9999, "Port on which to start the server.")
+
+func main() {
+	flag.Parse()
+
+	server := new(service.MultiplicationService)
+	rpc.Register(server)
+	rpc.HandleHTTP()
+
+	l, err := net.Listen("tcp", fmt.Sprintf(":%d", *port))
+	if err != nil {
+		log.Fatal("Listen error:", err)
+	}
+
+	fmt.Printf("Serving on localhost:%d\n", *port)
+	http.Serve(l, nil)
+}

service/multiplication_service.go

@@ -0,0 +1,16 @@
+package service
+
+type MultiplicationRequest struct {
+	Factor1, Factor2 int
+}
+
+type MultiplicationResponse struct {
+	Product int
+}
+
+type MultiplicationService struct{}
+
+func (t *MultiplicationService) Multiply(request *MultiplicationRequest, response *MultiplicationResponse) error {
+	response.Product = request.Factor1 * request.Factor2
+	return nil
+}