examples: fix dir structure (#768)

* fix dir structure

examples/go.mod

@@ -7,7 +7,7 @@ require (
 	github.com/gin-gonic/gin v1.6.3
 	github.com/go-kratos/consul v0.0.0-20210311161349-cfb0345e820d
 	github.com/go-kratos/etcd v0.0.0-20210311152824-df5743ff1a11
-	github.com/go-kratos/kratos/v2 v2.0.0-20210311152607-a4409adf164e
+	github.com/go-kratos/kratos/v2 v2.0.0-20210315090606-74272546caa6
 	github.com/go-playground/validator/v10 v10.4.1 // indirect
 	github.com/go-redis/redis/extra/redisotel v0.2.0
 	github.com/go-redis/redis/v8 v8.6.0

examples/go.sum

@@ -124,6 +124,8 @@ github.com/go-kratos/etcd v0.0.0-20210311152824-df5743ff1a11 h1:yN0kNvtSmSmTznbv
 github.com/go-kratos/etcd v0.0.0-20210311152824-df5743ff1a11/go.mod h1:+1nilFyiWLlYpAWliKnbFhIax79n4l0mOTJhyNw5EEw=
 github.com/go-kratos/kratos/v2 v2.0.0-20210311152607-a4409adf164e h1:x/1thr6sE8fn09HekGNBdBX6PH9T6iacfJor0sDAZ6g=
 github.com/go-kratos/kratos/v2 v2.0.0-20210311152607-a4409adf164e/go.mod h1:oLvFyDBJkkWN8TPqb+NmpvRrSy9uM/K+XQubVRc11a8=
+github.com/go-kratos/kratos/v2 v2.0.0-20210315090606-74272546caa6 h1:iaZamLO1uUf5NBWXZ1WxP12baWhXNySwW3gUDtCkl+4=
+github.com/go-kratos/kratos/v2 v2.0.0-20210315090606-74272546caa6/go.mod h1:oLvFyDBJkkWN8TPqb+NmpvRrSy9uM/K+XQubVRc11a8=
 github.com/go-logfmt/logfmt v0.3.0/go.mod h1:Qt1PoO58o5twSAckw1HlFXLmHsOX5/0LbT9GBnD5lWE=
 github.com/go-logfmt/logfmt v0.4.0/go.mod h1:3RMwSq7FuexP4Kalkev3ejPJsZTpXXBr9+V4qmtdjCk=
 github.com/go-openapi/inflect v0.19.0/go.mod h1:lHpZVlpIQqLyKwJ4N+YSc9hchQy/i12fJykb83CRBH4=

examples/http/gin/main.go

@@ -5,7 +5,7 @@ import (
 
 	"github.com/gin-gonic/gin"
 	"github.com/go-kratos/kratos/v2"
-	transhttp "github.com/go-kratos/kratos/v2/transport/http"
+	"github.com/go-kratos/kratos/v2/transport/http"
 )
 
 func main() {
@@ -13,7 +13,7 @@ func main() {
 	router.GET("/home", func(ctx *gin.Context) {
 		ctx.String(200, "Hello Gin!")
 	})
-	httpSrv := transhttp.NewServer(transhttp.Address(":8000"))
+	httpSrv := http.NewServer(http.Address(":8000"))
 	httpSrv.HandlePrefix("/", router)
 
 	app := kratos.New(

examples/registry/consul/client/main.go

@@ -5,8 +5,8 @@ import (
 	"log"
 
 	"github.com/go-kratos/consul/registry"
-	pb "github.com/go-kratos/kratos/examples/helloworld/helloworld"
-	transgrpc "github.com/go-kratos/kratos/v2/transport/grpc"
+	"github.com/go-kratos/kratos/examples/helloworld/helloworld"
+	"github.com/go-kratos/kratos/v2/transport/grpc"
 	"github.com/hashicorp/consul/api"
 )
 
@@ -16,16 +16,16 @@ func main() {
 		panic(err)
 	}
 	r := registry.New(cli)
-	conn, err := transgrpc.DialInsecure(
+	conn, err := grpc.DialInsecure(
 		context.Background(),
-		transgrpc.WithEndpoint("discovery://d/helloworld"),
-		transgrpc.WithDiscovery(r),
+		grpc.WithEndpoint("discovery:///helloworld"),
+		grpc.WithDiscovery(r),
 	)
 	if err != nil {
 		log.Fatal(err)
 	}
-	client := pb.NewGreeterClient(conn)
-	reply, err := client.SayHello(context.Background(), &pb.HelloRequest{Name: "kratos"})
+	client := helloworld.NewGreeterClient(conn)
+	reply, err := client.SayHello(context.Background(), &helloworld.HelloRequest{Name: "kratos"})
 	if err != nil {
 		log.Fatal(err)
 	}

examples/registry/etcd/client/main.go

@@ -5,8 +5,8 @@ import (
 	"log"
 
 	"github.com/go-kratos/etcd/registry"
-	pb "github.com/go-kratos/kratos/examples/helloworld/helloworld"
-	transgrpc "github.com/go-kratos/kratos/v2/transport/grpc"
+	"github.com/go-kratos/kratos/examples/helloworld/helloworld"
+	"github.com/go-kratos/kratos/v2/transport/grpc"
 	clientv3 "go.etcd.io/etcd/client/v3"
 )
 
@@ -18,16 +18,16 @@ func main() {
 		panic(err)
 	}
 	r := registry.New(cli)
-	conn, err := transgrpc.DialInsecure(
+	conn, err := grpc.DialInsecure(
 		context.Background(),
-		transgrpc.WithEndpoint("discovery://d/helloworld"),
-		transgrpc.WithDiscovery(r),
+		grpc.WithEndpoint("discovery:///helloworld"),
+		grpc.WithDiscovery(r),
 	)
 	if err != nil {
 		log.Fatal(err)
 	}
-	client := pb.NewGreeterClient(conn)
-	reply, err := client.SayHello(context.Background(), &pb.HelloRequest{Name: "kratos"})
+	client := helloworld.NewGreeterClient(conn)
+	reply, err := client.SayHello(context.Background(), &helloworld.HelloRequest{Name: "kratos"})
 	if err != nil {
 		log.Fatal(err)
 	}

examples/registry/etcd/server/main.go

@@ -9,7 +9,7 @@ import (
 	pb "github.com/go-kratos/kratos/examples/helloworld/helloworld"
 	"github.com/go-kratos/kratos/v2"
 	"github.com/go-kratos/kratos/v2/transport/grpc"
-	clientv3 "go.etcd.io/etcd/client/v3"
+	etcd "go.etcd.io/etcd/client/v3"
 )
 
 // server is used to implement helloworld.GreeterServer.
@@ -30,11 +30,11 @@ func main() {
 	s := &server{}
 	pb.RegisterGreeterServer(grpcSrv, s)
 
-	cli, err := clientv3.New(clientv3.Config{
+	cli, err := etcd.New(etcd.Config{
 		Endpoints: []string{"127.0.0.1:2379"},
 	})
 	if err != nil {
-		panic(err)
+		log.Fatal(err)
 	}
 	r := registry.New(cli)
 	app := kratos.New(