Update readme with example

README.md

@@ -6,15 +6,19 @@ An example server can be found in go-micro/template.
 
 ## Prerequisites
 
+Consul is the default discovery mechanism provided in go-micro. Discovery is however pluggable.
+
 ### Install Consul
 [https://www.consul.io/intro/getting-started/install.html](https://www.consul.io/intro/getting-started/install.html)
 
+## Getting Started
+
 ### Run Consul
 ```
 $ consul agent -server -bootstrap-expect 1 -data-dir /tmp/consul
 ```
 
-## Run Service
+### Run Service
 ```
 $ go run go-micro/template/main.go
 
@@ -24,9 +28,98 @@ $ go run go-micro/template/main.go
 1416690099281215346 [Debug] Registering go.micro.service.template-c0bfcb44-728a-11e4-b099-68a86d0d36b6
 ```
 
-## Test Service
+### Test Service
 ```
 $ go run go-micro/examples/service_client.go
 
 go.micro.service.template-c0bfcb44-728a-11e4-b099-68a86d0d36b6: Hello John
 ```
+
+## Writing a service
+
+### Create request/response proto
+`go-micro/template/proto/example/example.proto`:
+
+```
+package go.micro.service.template.example;
+
+message Request {
+	required string name = 1;
+}
+
+message Response {
+	required string msg = 1;
+}
+```
+
+Compile proto `protoc -I$GOPATH/src --go_out=$GOPATH/src $GOPATH/src/github.com/asim/go-micro/template/proto/example/example.proto`
+
+### Create request handler
+`go-micro/template/handler/example.go`:
+
+```
+package handler
+
+import (
+	"code.google.com/p/go.net/context"
+	"code.google.com/p/goprotobuf/proto"
+
+	"github.com/asim/go-micro/server"
+	example "github.com/asim/go-micro/template/proto/example"
+	log "github.com/cihub/seelog"
+)
+
+type Example struct{}
+
+func (e *Example) Call(ctx context.Context, req *example.Request, rsp *example.Response) error {
+	log.Debug("Received Example.Call request")
+
+	rsp.Msg = proto.String(server.Id + ": Hello " + req.GetName())
+
+	return nil
+}
+```
+
+### Init server
+`go-micro/template/main.go`:
+
+```
+package main
+
+import (
+	"log"
+
+	"github.com/asim/go-micro/server"
+	"github.com/asim/go-micro/template/handler"
+)
+
+func main() {
+	server.Name = "go.micro.service.template"
+
+	// Initialise Server
+	server.Init()
+
+	// Register Handlers
+	server.Register(
+		server.NewReceiver(
+			new(handler.Example),
+		),
+	)
+
+	// Run server
+	if err := server.Run(); err != nil {
+		log.Fatal(err)
+	}
+
+}
+```
+
+### Run service
+```
+$ go run go-micro/template/main.go
+
+1416690099281057746 [Debug] Rpc handler /_rpc
+1416690099281092588 [Debug] Starting server go.micro.service.template id go.micro.service.template-c0bfcb44-728a-11e4-b099-68a86d0d36b6
+1416690099281192941 [Debug] Listening on [::]:58264
+1416690099281215346 [Debug] Registering go.micro.service.template-c0bfcb44-728a-11e4-b099-68a86d0d36b6
+```