add p2c peak ewma load balancer

example/rpc/client/direct/client.go

@@ -28,12 +28,7 @@ func main() {
 	for {
 		select {
 		case <-ticker.C:
-			conn, ok := client.Next()
-			if !ok {
-				time.Sleep(time.Second)
-				break
-			}
-
+			conn := client.Conn()
 			greet := unary.NewGreeterClient(conn)
 			ctx, cancel := context.WithTimeout(context.Background(), time.Second)
 			resp, err := greet.Greet(ctx, &unary.Request{

example/rpc/client/lb/main.go

@@ -0,0 +1,37 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"time"
+
+	"zero/core/discov"
+	"zero/example/rpc/remote/unary"
+	"zero/rpcx"
+)
+
+func main() {
+	cli := rpcx.MustNewClient(rpcx.RpcClientConf{
+		Etcd: discov.EtcdConf{
+			Hosts: []string{"localhost:2379"},
+			Key:   "rpcx",
+		},
+	})
+	greet := unary.NewGreeterClient(cli.Conn())
+	ticker := time.NewTicker(time.Second)
+	defer ticker.Stop()
+
+	for {
+		select {
+		case <-ticker.C:
+			resp, err := greet.Greet(context.Background(), &unary.Request{
+				Name: "kevin",
+			})
+			if err != nil {
+				fmt.Println("X", err.Error())
+			} else {
+				fmt.Println("=>", resp.Greet)
+			}
+		}
+	}
+}

example/rpc/client/stream/client.go

@@ -26,11 +26,7 @@ func main() {
 		log.Fatal(err)
 	}
 
-	conn, ok := client.Next()
-	if !ok {
-		log.Fatal("no server")
-	}
-
+	conn := client.Conn()
 	greet := stream.NewStreamGreeterClient(conn)
 	stm, err := greet.Greet(context.Background())
 	if err != nil {

example/rpc/client/unary/client.go

@@ -4,7 +4,6 @@ import (
 	"context"
 	"flag"
 	"fmt"
-	"log"
 	"time"
 
 	"zero/core/conf"
@@ -25,11 +24,7 @@ func main() {
 	for {
 		select {
 		case <-ticker.C:
-			conn, ok := client.Next()
-			if !ok {
-				log.Fatal("no server")
-			}
-
+			conn := client.Conn()
 			greet := unary.NewGreeterClient(conn)
 			resp, err := greet.Greet(context.Background(), &unary.Request{
 				Name: "kevin",