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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"
"strings"
"github.com/spf13/cobra"
"go.etcd.io/etcd/client/v3"
"go.etcd.io/etcd/pkg/v3/cobrautl"
)
var (
getConsistency string
getLimit int64
getSortOrder string
getSortTarget string
getPrefix bool
getFromKey bool
getRev int64
getKeysOnly bool
getCountOnly bool
printValueOnly bool
)
// NewGetCommand returns the cobra command for "get".
func NewGetCommand() *cobra.Command {
cmd := &cobra.Command{
Use: "get [options] <key> [range_end]",
Short: "Gets the key or a range of keys",
Run: getCommandFunc,
}
cmd.Flags().StringVar(&getConsistency, "consistency", "l", "Linearizable(l) or Serializable(s)")
cmd.Flags().StringVar(&getSortOrder, "order", "", "Order of results; ASCEND or DESCEND (ASCEND by default)")
cmd.Flags().StringVar(&getSortTarget, "sort-by", "", "Sort target; CREATE, KEY, MODIFY, VALUE, or VERSION")
cmd.Flags().Int64Var(&getLimit, "limit", 0, "Maximum number of results")
cmd.Flags().BoolVar(&getPrefix, "prefix", false, "Get keys with matching prefix")
cmd.Flags().BoolVar(&getFromKey, "from-key", false, "Get keys that are greater than or equal to the given key using byte compare")
cmd.Flags().Int64Var(&getRev, "rev", 0, "Specify the kv revision")
cmd.Flags().BoolVar(&getKeysOnly, "keys-only", false, "Get only the keys")
cmd.Flags().BoolVar(&getCountOnly, "count-only", false, "Get only the count")
cmd.Flags().BoolVar(&printValueOnly, "print-value-only", false, `Only write values when using the "simple" output format`)
return cmd
}
// getCommandFunc executes the "get" command.
func getCommandFunc(cmd *cobra.Command, args []string) {
key, opts := getGetOp(args)
ctx, cancel := commandCtx(cmd)
resp, err := mustClientFromCmd(cmd).Get(ctx, key, opts...)
cancel()
if err != nil {
cobrautl.ExitWithError(cobrautl.ExitError, err)
}
if getCountOnly {
if _, fields := display.(*fieldsPrinter); !fields {
cobrautl.ExitWithError(cobrautl.ExitBadArgs, fmt.Errorf("--count-only is only for `--write-out=fields`"))
}
}
if printValueOnly {
dp, simple := (display).(*simplePrinter)
if !simple {
cobrautl.ExitWithError(cobrautl.ExitBadArgs, fmt.Errorf("print-value-only is only for `--write-out=simple`"))
}
dp.valueOnly = true
}
display.Get(*resp)
}
func getGetOp(args []string) (string, []clientv3.OpOption) {
if len(args) == 0 {
cobrautl.ExitWithError(cobrautl.ExitBadArgs, fmt.Errorf("get command needs one argument as key and an optional argument as range_end"))
}
if getPrefix && getFromKey {
cobrautl.ExitWithError(cobrautl.ExitBadArgs, fmt.Errorf("`--prefix` and `--from-key` cannot be set at the same time, choose one"))
}
if getKeysOnly && getCountOnly {
cobrautl.ExitWithError(cobrautl.ExitBadArgs, fmt.Errorf("`--keys-only` and `--count-only` cannot be set at the same time, choose one"))
}
opts := []clientv3.OpOption{}
switch getConsistency {
case "s":
opts = append(opts, clientv3.WithSerializable())
case "l":
default:
cobrautl.ExitWithError(cobrautl.ExitBadFeature, fmt.Errorf("unknown consistency flag %q", getConsistency))
}
key := args[0]
if len(args) > 1 {
if getPrefix || getFromKey {
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]))
}
opts = append(opts, clientv3.WithLimit(getLimit))
if getRev > 0 {
opts = append(opts, clientv3.WithRev(getRev))
}
sortByOrder := clientv3.SortNone
sortOrder := strings.ToUpper(getSortOrder)
switch {
case sortOrder == "ASCEND":
sortByOrder = clientv3.SortAscend
case sortOrder == "DESCEND":
sortByOrder = clientv3.SortDescend
case sortOrder == "":
// nothing
default:
cobrautl.ExitWithError(cobrautl.ExitBadFeature, fmt.Errorf("bad sort order %v", getSortOrder))
}
sortByTarget := clientv3.SortByKey
sortTarget := strings.ToUpper(getSortTarget)
switch {
case sortTarget == "CREATE":
sortByTarget = clientv3.SortByCreateRevision
case sortTarget == "KEY":
sortByTarget = clientv3.SortByKey
case sortTarget == "MODIFY":
sortByTarget = clientv3.SortByModRevision
case sortTarget == "VALUE":
sortByTarget = clientv3.SortByValue
case sortTarget == "VERSION":
sortByTarget = clientv3.SortByVersion
case sortTarget == "":
// nothing
default:
cobrautl.ExitWithError(cobrautl.ExitBadFeature, fmt.Errorf("bad sort target %v", getSortTarget))
}
opts = append(opts, clientv3.WithSort(sortByTarget, sortByOrder))
if getPrefix {
if len(key) == 0 {
key = "\x00"
opts = append(opts, clientv3.WithFromKey())
} else {
opts = append(opts, clientv3.WithPrefix())
}
}
if getFromKey {
if len(key) == 0 {
key = "\x00"
}
opts = append(opts, clientv3.WithFromKey())
}
if getKeysOnly {
opts = append(opts, clientv3.WithKeysOnly())
}
if getCountOnly {
opts = append(opts, clientv3.WithCountOnly())
}
return key, opts
}
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