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// Copyright 2015 The etcd Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package command
import (
"fmt"
"os"
"github.com/spf13/cobra"
clientv3 "go.etcd.io/etcd/client/v3"
"go.etcd.io/etcd/pkg/v3/cobrautl"
)
var (
delPrefix bool
delPrevKV bool
delFromKey bool
delRange bool
)
// NewDelCommand returns the cobra command for "del".
func NewDelCommand() *cobra.Command {
cmd := &cobra.Command{
Use: "del [options] <key> [range_end]",
Short: "Removes the specified key or range of keys [key, range_end)",
Run: delCommandFunc,
}
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")
cmd.Flags().BoolVar(&delRange, "range", false, "delete range of keys")
return cmd
}
// delCommandFunc executes the "del" command.
func delCommandFunc(cmd *cobra.Command, args []string) {
key, opts := getDelOp(args)
ctx, cancel := commandCtx(cmd)
resp, err := mustClientFromCmd(cmd).Delete(ctx, key, opts...)
cancel()
if err != nil {
cobrautl.ExitWithError(cobrautl.ExitError, err)
}
display.Del(*resp)
}
func getDelOp(args []string) (string, []clientv3.OpOption) {
if len(args) == 0 || len(args) > 2 {
cobrautl.ExitWithError(cobrautl.ExitBadArgs, fmt.Errorf("del command needs one argument as key and an optional argument as range_end"))
}
if delPrefix && delFromKey {
cobrautl.ExitWithError(cobrautl.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 || delFromKey {
cobrautl.ExitWithError(cobrautl.ExitBadArgs, fmt.Errorf("too many arguments, only accept one argument when `--prefix` or `--from-key` is set"))
}
opts = append(opts, clientv3.WithRange(args[1]))
if !delRange {
fmt.Fprintln(os.Stderr, "In etcd v3.6, the operation will be suspended for a few seconds to provide the user time to verify range.")
}
}
if delPrefix {
if len(key) == 0 {
key = "\x00"
opts = append(opts, clientv3.WithFromKey())
} else {
opts = append(opts, clientv3.WithPrefix())
}
}
if delPrevKV {
opts = append(opts, clientv3.WithPrevKV())
}
if delFromKey {
if len(key) == 0 {
key = "\x00"
}
opts = append(opts, clientv3.WithFromKey())
}
return key, opts
}
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