add README and example cases for nacos registry (#3075)

contrib/registry/nacos/README.MD

@@ -0,0 +1,81 @@
+# GoFrame Nacos Registry
+
+
+Use `nacos` as service registration and discovery management.
+
+
+## Installation
+```
+go get -u -v github.com/gogf/gf/contrib/registry/nacos/v2
+```
+suggested using `go.mod`:
+```
+require github.com/gogf/gf/contrib/registry/nacos/v2 latest
+```
+
+
+## Example
+
+### Reference example
+
+[server](example/registry/nacos/server/main.go)
+```go
+package main
+
+import (
+	"github.com/gogf/gf/contrib/registry/nacos/v2"
+	"github.com/gogf/gf/v2/frame/g"
+	"github.com/gogf/gf/v2/net/ghttp"
+	"github.com/gogf/gf/v2/net/gsvc"
+)
+
+func main() {
+	gsvc.SetRegistry(nacos.New(`127.0.0.1:8848`).
+        SetClusterName("DEFAULT").
+        SetGroupName("DEFAULT_GROUP"))
+
+	s := g.Server(`hello.svc`)
+	s.BindHandler("/", func(r *ghttp.Request) {
+		g.Log().Info(r.Context(), `request received`)
+		r.Response.Write(`Hello world`)
+	})
+	s.Run()
+}
+```
+
+[client](example/registry/nacos/client/main.go)
+```go
+package main
+
+import (
+	"fmt"
+	"time"
+
+	"github.com/gogf/gf/contrib/registry/nacos/v2"
+	"github.com/gogf/gf/v2/frame/g"
+	"github.com/gogf/gf/v2/net/gsel"
+	"github.com/gogf/gf/v2/net/gsvc"
+	"github.com/gogf/gf/v2/os/gctx"
+)
+
+func main() {
+	gsvc.SetRegistry(nacos.New(`127.0.0.1:8848`))
+	gsel.SetBuilder(gsel.NewBuilderRoundRobin())
+
+	client := g.Client()
+	for i := 0; i < 100; i++ {
+		res, err := client.Get(gctx.New(), `http://hello.svc/`)
+		if err != nil {
+			panic(err)
+		}
+		fmt.Println(res.ReadAllString())
+		res.Close()
+		time.Sleep(time.Second)
+	}
+}
+```
+
+## License
+
+`GoFrame Nacos` is licensed under the [MIT License](../../../LICENSE), 100% free and open-source, forever.
+

contrib/registry/nacos/nacos_z_test.go

@@ -136,7 +136,7 @@ func TestWatch(t *testing.T) {
 		t.AssertNil(err)
 		t.Assert(registered.GetName(), svc2.GetName())
 
-		time.Sleep(time.Second * 1)
+		time.Sleep(time.Second * 10)
 
 		// Watch and retrieve the service changes:
 		// svc1 and svc2 is the same service name, which has 2 endpoints.
@@ -154,7 +154,7 @@ func TestWatch(t *testing.T) {
 		err = registry2.Deregister(ctx, svc2)
 		t.AssertNil(err)
 
-		time.Sleep(time.Second * 1)
+		time.Sleep(time.Second * 10)
 		proceedResult, err = watcher.Proceed()
 		t.AssertNil(err)
 		t.Assert(len(proceedResult), 1)

example/registry/nacos/grpc/client/client.go

@@ -0,0 +1,31 @@
+// Copyright GoFrame Author(https://goframe.org). All Rights Reserved.
+//
+// This Source Code Form is subject to the terms of the MIT License.
+// If a copy of the MIT was not distributed with this file,
+// You can obtain one at https://github.com/gogf/gf.
+
+package main
+
+import (
+	"github.com/gogf/gf/contrib/registry/nacos/v2"
+	"github.com/gogf/gf/contrib/rpc/grpcx/v2"
+	"github.com/gogf/gf/example/registry/etcd/grpc/protobuf"
+	"github.com/gogf/gf/v2/frame/g"
+	"github.com/gogf/gf/v2/os/gctx"
+)
+
+func main() {
+	grpcx.Resolver.Register(nacos.New("127.0.0.1:8848"))
+
+	var (
+		ctx    = gctx.New()
+		conn   = grpcx.Client.MustNewGrpcClientConn("demo")
+		client = protobuf.NewGreeterClient(conn)
+	)
+	res, err := client.SayHello(ctx, &protobuf.HelloRequest{Name: "World"})
+	if err != nil {
+		g.Log().Error(ctx, err)
+		return
+	}
+	g.Log().Debug(ctx, "Response:", res.Message)
+}

example/registry/nacos/grpc/controller/helloworld.go

@@ -0,0 +1,27 @@
+// Copyright GoFrame Author(https://goframe.org). All Rights Reserved.
+//
+// This Source Code Form is subject to the terms of the MIT License.
+// If a copy of the MIT was not distributed with this file,
+// You can obtain one at https://github.com/gogf/gf.
+
+package controller
+
+import (
+	"context"
+
+	"github.com/gogf/gf/contrib/rpc/grpcx/v2"
+	"github.com/gogf/gf/example/registry/etcd/grpc/protobuf"
+)
+
+type Controller struct {
+	protobuf.UnimplementedGreeterServer
+}
+
+func Register(s *grpcx.GrpcServer) {
+	protobuf.RegisterGreeterServer(s.Server, &Controller{})
+}
+
+// SayHello implements helloworld.GreeterServer
+func (s *Controller) SayHello(ctx context.Context, in *protobuf.HelloRequest) (*protobuf.HelloReply, error) {
+	return &protobuf.HelloReply{Message: "Hello " + in.GetName()}, nil
+}