etcdctlv3: make del command better

etcdctlv3/README.md

@@ -42,3 +42,30 @@ Insert '--' for workaround:
 ./etcdctl put -- <key> <value>
 ```
 
+### DEL [options] \<key\> [range_end]
+
+Removes the specified key or range of keys [key, range_end) if `range-end` is given.
+
+#### Options
+
+TODO: --prefix, --from
+
+#### Return value
+
+Simple reply
+
+- The number of keys that were removed in decimal if DEL executed correctly. Exit code is zero. 
+
+- Error string if DEL failed. Exit code is non-zero.
+
+TODO: probably json and binary encoded proto
+
+#### Examples
+
+``` bash
+./etcdctl put foo bar
+OK
+./etcdctl del foo
+1
+./etcdctl range foo
+```

etcdctlv3/command/del_command.go

@@ -0,0 +1,55 @@
+// Copyright 2015 CoreOS, Inc.
+//
+// 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"
+
+	"github.com/coreos/etcd/Godeps/_workspace/src/github.com/spf13/cobra"
+	"github.com/coreos/etcd/Godeps/_workspace/src/golang.org/x/net/context"
+	"github.com/coreos/etcd/clientv3"
+)
+
+// NewDelCommand returns the cobra command for "del".
+func NewDelCommand() *cobra.Command {
+	return &cobra.Command{
+		Use:   "del [options] <key> [range_end]",
+		Short: "Removes the specified key or range of keys [key, range_end).",
+		Run:   delCommandFunc,
+	}
+}
+
+// delCommandFunc executes the "del" command.
+func delCommandFunc(cmd *cobra.Command, args []string) {
+	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."))
+	}
+
+	opts := []clientv3.OpOption{}
+	key := args[0]
+	if len(args) > 1 {
+		opts = append(opts, clientv3.WithRange(args[1]))
+	}
+
+	c := mustClientFromCmd(cmd)
+	kvapi := clientv3.NewKV(c)
+	_, err := kvapi.Delete(context.TODO(), key, opts...)
+	if err != nil {
+		ExitWithError(ExitError, err)
+	}
+	// TODO: add number of key removed into the response of delete.
+	// TODO: print out the number of removed keys.
+	fmt.Println(0)
+}

etcdctlv3/command/delete_range_command.go

@@ -1,54 +0,0 @@
-// Copyright 2015 CoreOS, Inc.
-//
-// 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"
-
-	"github.com/coreos/etcd/Godeps/_workspace/src/github.com/spf13/cobra"
-	"github.com/coreos/etcd/Godeps/_workspace/src/golang.org/x/net/context"
-	pb "github.com/coreos/etcd/etcdserver/etcdserverpb"
-)
-
-// NewDeleteRangeCommand returns the cobra command for "deleteRange".
-func NewDeleteRangeCommand() *cobra.Command {
-	return &cobra.Command{
-		Use:   "delete-range",
-		Short: "DeleteRange deletes the given range from the store.",
-		Run:   deleteRangeCommandFunc,
-	}
-}
-
-// deleteRangeCommandFunc executes the "deleteRange" command.
-func deleteRangeCommandFunc(cmd *cobra.Command, args []string) {
-	if len(args) == 0 {
-		ExitWithError(ExitBadArgs, fmt.Errorf("delete-range command needs arguments."))
-	}
-
-	var rangeEnd []byte
-	key := []byte(args[0])
-	if len(args) > 1 {
-		rangeEnd = []byte(args[1])
-	}
-
-	req := &pb.DeleteRangeRequest{Key: key, RangeEnd: rangeEnd}
-	mustClientFromCmd(cmd).KV.DeleteRange(context.Background(), req)
-
-	if rangeEnd != nil {
-		fmt.Printf("range [%s, %s) is deleted\n", string(key), string(rangeEnd))
-	} else {
-		fmt.Printf("key %s is deleted\n", string(key))
-	}
-}

etcdctlv3/main.go

@@ -50,7 +50,7 @@ func init() {
 	rootCmd.AddCommand(
 		command.NewRangeCommand(),
 		command.NewPutCommand(),
-		command.NewDeleteRangeCommand(),
+		command.NewDelCommand(),
 		command.NewTxnCommand(),
 		command.NewCompactionCommand(),
 		command.NewWatchCommand(),