*: Add progress notify request watch request

etcdctl/ctlv3/command/watch_command.go

@@ -101,27 +101,33 @@ func watchInteractiveFunc(cmd *cobra.Command, osArgs []string, envKey, envRange
 		l = strings.TrimSuffix(l, "\n")
 
 		args := argify(l)
-		if len(args) < 2 && envKey == "" {
-			fmt.Fprintf(os.Stderr, "Invalid command %s (command type or key is not provided)\n", l)
-			continue
-		}
+		switch args[0] {
+		case "watch":
+			if len(args) < 2 && envKey == "" {
+				fmt.Fprintf(os.Stderr, "Invalid command %s (command type or key is not provided)\n", l)
+				continue
+			}
+			watchArgs, execArgs, perr := parseWatchArgs(osArgs, args, envKey, envRange, true)
+			if perr != nil {
+				ExitWithError(ExitBadArgs, perr)
+			}
 
-		if args[0] != "watch" {
+			ch, err := getWatchChan(c, watchArgs)
+			if err != nil {
+				fmt.Fprintf(os.Stderr, "Invalid command %s (%v)\n", l, err)
+				continue
+			}
+			go printWatchCh(c, ch, execArgs)
+		case "progress":
+			err := c.RequestProgress(clientv3.WithRequireLeader(context.Background()))
+			if err != nil {
+				ExitWithError(ExitError, err)
+			}
+		default:
 			fmt.Fprintf(os.Stderr, "Invalid command %s (only support watch)\n", l)
 			continue
 		}
 
-		watchArgs, execArgs, perr := parseWatchArgs(osArgs, args, envKey, envRange, true)
-		if perr != nil {
-			ExitWithError(ExitBadArgs, perr)
-		}
-
-		ch, err := getWatchChan(c, watchArgs)
-		if err != nil {
-			fmt.Fprintf(os.Stderr, "Invalid command %s (%v)\n", l, err)
-			continue
-		}
-		go printWatchCh(c, ch, execArgs)
 	}
 }
 
@@ -152,6 +158,9 @@ func printWatchCh(c *clientv3.Client, ch clientv3.WatchChan, execArgs []string)
 		if resp.Canceled {
 			fmt.Fprintf(os.Stderr, "watch was canceled (%v)\n", resp.Err())
 		}
+		if resp.IsProgressNotify() {
+			fmt.Fprintf(os.Stdout, "progress notify: %d\n", resp.Header.Revision)
+		}
 		display.Watch(resp)
 
 		if len(execArgs) > 0 {