use constants

1 files changed, 4 insertions, 3 deletions

diff --git a/weed/server/master_grpc_server_admin.go b/weed/server/master_grpc_server_admin.go
index 0649ea73e..153e48129 100644
--- a/weed/server/master_grpc_server_admin.go
+++ b/weed/server/master_grpc_server_admin.go
@@ -3,6 +3,7 @@ package weed_server
 import (
 	"context"
 	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/cluster"
 	"github.com/chrislusf/seaweedfs/weed/glog"
 	"github.com/chrislusf/seaweedfs/weed/pb"
 	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
@@ -148,19 +149,19 @@ func (ms *MasterServer) ReleaseAdminToken(ctx context.Context, req *master_pb.Re
 
 func (ms *MasterServer) Ping(ctx context.Context, req *master_pb.PingRequest) (resp *master_pb.PingResponse, pingErr error) {
 	resp = &master_pb.PingResponse{}
-	if req.TargetType == "Filer" {
+	if req.TargetType == cluster.FilerType {
 		pingErr = pb.WithFilerClient(false, pb.ServerAddress(req.Target), ms.grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
 			_, err := client.Ping(ctx, &filer_pb.PingRequest{})
 			return err
 		})
 	}
-	if req.TargetType == "VolumeServer" {
+	if req.TargetType == cluster.VolumeServerType {
 		pingErr = pb.WithVolumeServerClient(false, pb.ServerAddress(req.Target), ms.grpcDialOption, func(client volume_server_pb.VolumeServerClient) error {
 			_, err := client.Ping(ctx, &volume_server_pb.PingRequest{})
 			return err
 		})
 	}
-	if req.TargetType == "Master" {
+	if req.TargetType == cluster.MasterType {
 		pingErr = pb.WithMasterClient(false, pb.ServerAddress(req.Target), ms.grpcDialOption, func(client master_pb.SeaweedClient) error {
 			_, err := client.Ping(ctx, &master_pb.PingRequest{})
 			return err