tools: rewrite benchmark tool

tools/benchmark/cmd/root.go

@@ -0,0 +1,57 @@
+// 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 cmd
+
+import (
+	"fmt"
+	"os"
+	"sync"
+
+	"github.com/coreos/etcd/Godeps/_workspace/src/github.com/cheggaaa/pb"
+	"github.com/coreos/etcd/Godeps/_workspace/src/github.com/spf13/cobra"
+)
+
+// This represents the base command when called without any subcommands
+var RootCmd = &cobra.Command{
+	Use:   "benchmark",
+	Short: "A low-level benchmark tool for etcd3",
+	Long: `benchmark is a low-level benchmakr tool for etcd3.
+It uses gRPC client directly and does not depend on 
+etcd client libray.
+	`,
+}
+
+var (
+	endpoints    string
+	totalConns   uint
+	totalClients uint
+
+	bar     *pb.ProgressBar
+	results chan *result
+	wg      sync.WaitGroup
+)
+
+func init() {
+	RootCmd.PersistentFlags().StringVar(&endpoints, "endpoint", "127.0.0.1:2378", "comma-separated gRPC endpoints")
+	RootCmd.PersistentFlags().UintVar(&totalConns, "conns", 1, "Total number of gRPC connections")
+	RootCmd.PersistentFlags().UintVar(&totalClients, "clients", 1, "Total number of gRPC clients")
+}
+
+func Execute() {
+	if err := RootCmd.Execute(); err != nil {
+		fmt.Println(err)
+		os.Exit(-1)
+	}
+}