add grpc example

README.md

@@ -28,6 +28,7 @@ Use flag `--registry=mdns`
 - [client](client) - Usage of the Client package to call a service.
 - [server](server) - Use of the Server package directly to server requests.
 - [service](service) - Example of the top level Service in go-micro.
+- [grpc](grpc) - Examples of how to use [go-grpc](https://github.com/micro/go-grpc)
 
 ## External
 

grpc/README.md

@@ -0,0 +1,6 @@
+# GRPC
+
+Contains examples for using [go-grpc](https://github.com/micro/go-grpc)
+
+- [greeter](greeter) - A greeter example
+

grpc/greeter/README.md

@@ -0,0 +1,23 @@
+# Greeter Service
+
+An example Go-Micro based GRPC service
+
+## What's here?
+
+- **srv** - a GRPC greeter service
+- **cli** - a GRPC client that calls the service once
+
+Run Service
+```
+$ go run server/main.go --registry=mdns
+2016/11/03 18:41:22 Listening on [::]:55194
+2016/11/03 18:41:22 Broker Listening on [::]:55195
+2016/11/03 18:41:22 Registering node: go.micro.srv.greeter-1e200612-a1f5-11e6-8e84-68a86d0d36b6
+```
+
+Test Service
+```
+$ go run client/main.go --registry=mdns
+Hello John
+```
+

grpc/greeter/cli/main.go

@@ -0,0 +1,35 @@
+package main
+
+import (
+	"fmt"
+
+	hello "github.com/micro/examples/grpc/greeter/srv/proto/hello"
+	"github.com/micro/go-grpc"
+	"github.com/micro/go-micro/metadata"
+
+	"golang.org/x/net/context"
+)
+
+func main() {
+	service := grpc.NewService()
+	service.Init()
+
+	// use the generated client stub
+	cl := hello.NewSayClient("go.micro.srv.greeter", service.Client())
+
+	// Set arbitrary headers in context
+	ctx := metadata.NewContext(context.Background(), map[string]string{
+		"X-User-Id": "john",
+		"X-From-Id": "script",
+	})
+
+	rsp, err := cl.Hello(ctx, &hello.Request{
+		Name: "John",
+	})
+	if err != nil {
+		fmt.Println(err)
+		return
+	}
+
+	fmt.Println(rsp.Msg)
+}

grpc/greeter/srv/main.go

@@ -0,0 +1,39 @@
+package main
+
+import (
+	"log"
+	"time"
+
+	hello "github.com/micro/examples/greeter/srv/proto/hello"
+	"github.com/micro/go-grpc"
+	"github.com/micro/go-micro"
+
+	"golang.org/x/net/context"
+)
+
+type Say struct{}
+
+func (s *Say) Hello(ctx context.Context, req *hello.Request, rsp *hello.Response) error {
+	log.Print("Received Say.Hello request")
+	rsp.Msg = "Hello " + req.Name
+	return nil
+}
+
+func main() {
+	service := grpc.NewService(
+		micro.Name("go.micro.srv.greeter"),
+		micro.RegisterTTL(time.Second*30),
+		micro.RegisterInterval(time.Second*10),
+	)
+
+	// optionally setup command line usage
+	service.Init()
+
+	// Register Handlers
+	hello.RegisterSayHandler(service.Server(), new(Say))
+
+	// Run server
+	if err := service.Run(); err != nil {
+		log.Fatal(err)
+	}
+}

grpc/greeter/srv/proto/hello/hello.proto

@@ -0,0 +1,15 @@
+syntax = "proto3";
+
+package go.micro.srv.greeter;
+
+service Say {
+	rpc Hello(Request) returns (Response) {}
+}
+
+message Request {
+	string name = 1;
+}
+
+message Response {
+	string msg = 1;
+}