ctl: sort gc safepoint in pd-ctl

server/api/service_gc_safepoint.go

@@ -35,16 +35,17 @@ func newServiceGCSafepointHandler(svr *server.Server, rd *render.Render) *servic
 	}
 }
 
+// ListServiceGCSafepoint is the response for list service GC safepoint.
 // NOTE: This type is exported by HTTP API. Please pay more attention when modifying it.
-type listServiceGCSafepoint struct {
+type ListServiceGCSafepoint struct {
 	ServiceGCSafepoints []*endpoint.ServiceSafePoint `json:"service_gc_safe_points"`
 	GCSafePoint         uint64                       `json:"gc_safe_point"`
 }
 
 // @Tags     service_gc_safepoint
 // @Summary  Get all service GC safepoint.
 // @Produce  json
-// @Success  200  {array}   listServiceGCSafepoint
+// @Success  200  {array}   ListServiceGCSafepoint
 // @Failure  500  {string}  string  "PD server failed to proceed the request."
 // @Router   /gc/safepoint [get]
 func (h *serviceGCSafepointHandler) GetGCSafePoint(w http.ResponseWriter, r *http.Request) {
@@ -59,7 +60,7 @@ func (h *serviceGCSafepointHandler) GetGCSafePoint(w http.ResponseWriter, r *htt
 		h.rd.JSON(w, http.StatusInternalServerError, err.Error())
 		return
 	}
-	list := listServiceGCSafepoint{
+	list := ListServiceGCSafepoint{
 		GCSafePoint:         gcSafepoint,
 		ServiceGCSafepoints: ssps,
 	}

server/api/service_gc_safepoint_test.go

@@ -58,7 +58,7 @@ func (suite *serviceGCSafepointTestSuite) TestServiceGCSafepoint() {
 	sspURL := suite.urlPrefix + "/gc/safepoint"
 
 	storage := suite.svr.GetStorage()
-	list := &listServiceGCSafepoint{
+	list := &ListServiceGCSafepoint{
 		ServiceGCSafepoints: []*endpoint.ServiceSafePoint{
 			{
 				ServiceID: "a",
@@ -87,7 +87,7 @@ func (suite *serviceGCSafepointTestSuite) TestServiceGCSafepoint() {
 	res, err := testDialClient.Get(sspURL)
 	suite.NoError(err)
 	defer res.Body.Close()
-	listResp := &listServiceGCSafepoint{}
+	listResp := &ListServiceGCSafepoint{}
 	err = apiutil.ReadJSON(res.Body, listResp)
 	suite.NoError(err)
 	suite.Equal(list, listResp)

tools/pd-ctl/pdctl/command/gc_safepoint_command.go

@@ -15,9 +15,12 @@
 package command
 
 import (
+	"encoding/json"
 	"net/http"
+	"sort"
 
 	"github.com/spf13/cobra"
+	"github.com/tikv/pd/server/api"
 )
 
 var (
@@ -52,7 +55,20 @@ func showSSPs(cmd *cobra.Command, args []string) {
 		cmd.Printf("Failed to get service GC safepoint: %s\n", err)
 		return
 	}
-	cmd.Println(r)
+	var safepoint api.ListServiceGCSafepoint
+	if err := json.Unmarshal([]byte(r), &safepoint); err != nil {
+		cmd.Printf("Failed to unmarshal service GC safepoint: %s\n", err)
+		return
+	}
+	sort.Slice(safepoint.ServiceGCSafepoints, func(i, j int) bool {
+		return safepoint.ServiceGCSafepoints[i].SafePoint < safepoint.ServiceGCSafepoints[j].SafePoint
+	})
+	data, err := json.MarshalIndent(safepoint, "", "  ")
+	if err != nil {
+		cmd.Printf("Failed to marshal service GC safepoint: %s\n", err)
+		return
+	}
+	cmd.Println(string(data))
 }
 
 func deleteSSP(cmd *cobra.Command, args []string) {