etcdctlv3: del command from-key feature added

e2e/ctl_v3_kv_test.go

@@ -192,6 +192,11 @@ func delTest(cx ctlCtx) {
 			[]string{"key", "--prefix"},
 			3,
 		},
+		{
+			[]kv{{"zoo1", "bar"}, {"zoo2", "bar2"}, {"zoo3", "bar3"}},
+			[]string{"zoo1", "--from-key"},
+			3,
+		},
 	}
 
 	for i, tt := range tests {

etcdctl/ctlv3/command/del_command.go

@@ -22,8 +22,9 @@ import (
 )
 
 var (
-	delPrefix bool
-	delPrevKV bool
+	delPrefix  bool
+	delPrevKV  bool
+	delFromKey bool
 )
 
 // NewDelCommand returns the cobra command for "del".
@@ -36,7 +37,7 @@ func NewDelCommand() *cobra.Command {
 
 	cmd.Flags().BoolVar(&delPrefix, "prefix", false, "delete keys with matching prefix")
 	cmd.Flags().BoolVar(&delPrevKV, "prev-kv", false, "return deleted key-value pairs")
-
+	cmd.Flags().BoolVar(&delFromKey, "from-key", false, "delete keys that are greater than or equal to the given key using byte compare")
 	return cmd
 }
 
@@ -56,11 +57,16 @@ func getDelOp(cmd *cobra.Command, args []string) (string, []clientv3.OpOption) {
 	if len(args) == 0 || len(args) > 2 {
 		ExitWithError(ExitBadArgs, fmt.Errorf("del command needs one argument as key and an optional argument as range_end."))
 	}
+
+	if delPrefix && delFromKey {
+		ExitWithError(ExitBadArgs, fmt.Errorf("`--prefix` and `--from-key` cannot be set at the same time, choose one."))
+	}
+
 	opts := []clientv3.OpOption{}
 	key := args[0]
 	if len(args) > 1 {
-		if delPrefix {
-			ExitWithError(ExitBadArgs, fmt.Errorf("too many arguments, only accept one argument when `--prefix` is set."))
+		if delPrefix || delFromKey {
+			ExitWithError(ExitBadArgs, fmt.Errorf("too many arguments, only accept one argument when `--prefix` or `--from-key` is set."))
 		}
 		opts = append(opts, clientv3.WithRange(args[1]))
 	}
@@ -72,5 +78,12 @@ func getDelOp(cmd *cobra.Command, args []string) (string, []clientv3.OpOption) {
 		opts = append(opts, clientv3.WithPrevKV())
 	}
 
+	if delFromKey {
+		if len(key) == 0 {
+			key = "\x00"
+		}
+		opts = append(opts, clientv3.WithFromKey())
+	}
+
 	return key, opts
 }