fix:etcd<3.13 block question (#1317)

examples/go.mod

@@ -8,7 +8,7 @@ require (
 	github.com/envoyproxy/protoc-gen-validate v0.6.1
 	github.com/gin-gonic/gin v1.7.3
 	github.com/go-kratos/consul v0.1.4
-	github.com/go-kratos/etcd v0.1.2
+	github.com/go-kratos/etcd v0.1.3
 	github.com/go-kratos/gin v0.1.0
 	github.com/go-kratos/kratos/v2 v2.0.3
 	github.com/go-kratos/nacos v0.1.1

examples/go.sum

@@ -178,8 +178,8 @@ github.com/go-kratos/consul v0.1.2/go.mod h1:FhxdCfkqaqIYfgpGbzGb8ywM/zV3jk+EBS+
 github.com/go-kratos/consul v0.1.4 h1:qOOQE/FYpbWLV4cipC+jPrrc/gQY1DdfnX0IJvQleXE=
 github.com/go-kratos/consul v0.1.4/go.mod h1:egsB9apqg+4BMYVnY/VuQCeC3aAmd7mpYfIMhs4ga4U=
 github.com/go-kratos/etcd v0.1.0/go.mod h1:RzWYbka3LjS0v2RbCtADN7d2Ng8eH774ehHlTGgbma4=
-github.com/go-kratos/etcd v0.1.2 h1:/thmpcEUleRro1bbRN3NfJHFwYzjVvbojvQv1QKGljg=
-github.com/go-kratos/etcd v0.1.2/go.mod h1:+MGVcBnNfpiZ2kw05P/m0ijKNLhRz1p0HXWJhO85AJI=
+github.com/go-kratos/etcd v0.1.3 h1:ARz1j4nZGgpeSw8WYau5y8LiKbsty/tMASQCaiOGZnM=
+github.com/go-kratos/etcd v0.1.3/go.mod h1:4UAwbmm/PIjUS9KwhqmfsBi9pksuvwc3ae+xaKF0Lwk=
 github.com/go-kratos/gin v0.1.0 h1:yq5GfZnSNo8cOIqxqPE0FVNQ8fm++oKQBd3/rTTp4oI=
 github.com/go-kratos/gin v0.1.0/go.mod h1:KzE88+mV1QJdmiT+sU2D560ucOXnWZx+4m0OnVcSyzQ=
 github.com/go-kratos/grpc-gateway/v2 v2.0.0-20210804092615-bdc92eb5ce83 h1:YN1KsqX3mB8hkSrOLZv3xZaZh+lZ/L7QC00RATFLJSg=

examples/registry/etcd/client/main.go

@@ -10,6 +10,7 @@ import (
 	"github.com/go-kratos/kratos/v2/transport/grpc"
 	"github.com/go-kratos/kratos/v2/transport/http"
 	clientv3 "go.etcd.io/etcd/client/v3"
+	srcgrpc "google.golang.org/grpc"
 )
 
 func main() {
@@ -20,15 +21,8 @@ func main() {
 		panic(err)
 	}
 	r := registry.New(cli)
-	for {
-		callHTTP(r)
-		callGRPC(r)
-		time.Sleep(time.Second)
-	}
-}
 
-func callGRPC(r *registry.Registry) {
-	conn, err := grpc.DialInsecure(
+	connGrpc, err := grpc.DialInsecure(
 		context.Background(),
 		grpc.WithEndpoint("discovery:///helloworld"),
 		grpc.WithDiscovery(r),
@@ -36,17 +30,9 @@ func callGRPC(r *registry.Registry) {
 	if err != nil {
 		log.Fatal(err)
 	}
-	defer conn.Close()
-	client := helloworld.NewGreeterClient(conn)
-	reply, err := client.SayHello(context.Background(), &helloworld.HelloRequest{Name: "kratos"})
-	if err != nil {
-		log.Fatal(err)
-	}
-	log.Printf("[grpc] SayHello %+v\n", reply)
-}
+	defer connGrpc.Close()
 
-func callHTTP(r *registry.Registry) {
-	conn, err := http.NewClient(
+	connHttp, err := http.NewClient(
 		context.Background(),
 		http.WithEndpoint("discovery:///helloworld"),
 		http.WithDiscovery(r),
@@ -55,7 +41,25 @@ func callHTTP(r *registry.Registry) {
 	if err != nil {
 		log.Fatal(err)
 	}
-	defer conn.Close()
+	defer connHttp.Close()
+
+	for {
+		callHTTP(r, connHttp)
+		callGRPC(r, connGrpc)
+		time.Sleep(time.Second)
+	}
+}
+
+func callGRPC(r *registry.Registry, conn *srcgrpc.ClientConn) {
+	client := helloworld.NewGreeterClient(conn)
+	reply, err := client.SayHello(context.Background(), &helloworld.HelloRequest{Name: "kratos"})
+	if err != nil {
+		log.Fatal(err)
+	}
+	log.Printf("[grpc] SayHello %+v\n", reply)
+}
+
+func callHTTP(r *registry.Registry,conn *http.Client) {
 	client := helloworld.NewGreeterHTTPClient(conn)
 	reply, err := client.SayHello(context.Background(), &helloworld.HelloRequest{Name: "kratos"})
 	if err != nil {