refactor rpcx, export WithDialOption and WithTimeout

example/graceful/dns/api/svc/servicecontext.go

@@ -3,5 +3,5 @@ package svc
 import "github.com/tal-tech/go-zero/rpcx"
 
 type ServiceContext struct {
-	Client *rpcx.RpcClient
+	Client rpcx.Client
 }

example/graceful/etcd/api/svc/servicecontext.go

@@ -3,5 +3,5 @@ package svc
 import "github.com/tal-tech/go-zero/rpcx"
 
 type ServiceContext struct {
-	Client *rpcx.RpcClient
+	Client rpcx.Client
 }

example/tracing/edge/main.go

@@ -15,7 +15,7 @@ import (
 
 var (
 	configFile = flag.String("f", "config.json", "the config file")
-	client     *rpcx.RpcClient
+	client     rpcx.Client
 )
 
 func handle(w http.ResponseWriter, r *http.Request) {

example/tracing/portal/server.go

@@ -20,11 +20,11 @@ type (
 	}
 
 	PortalServer struct {
-		userRpc *rpcx.RpcClient
+		userRpc rpcx.Client
 	}
 )
 
-func NewPortalServer(client *rpcx.RpcClient) *PortalServer {
+func NewPortalServer(client rpcx.Client) *PortalServer {
 	return &PortalServer{
 		userRpc: client,
 	}