stolonctl: add clusterdata command

Add a stolonctl command to display current clusterdata.

cmd/stolonctl/clusterdata.go

@@ -0,0 +1,67 @@
+// Copyright 2017 Sorint.lab
+//
+// 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 main
+
+import (
+	"encoding/json"
+
+	"github.com/spf13/cobra"
+)
+
+var cmdClusterData = &cobra.Command{
+	Use:   "clusterdata",
+	Run:   clusterdata,
+	Short: "Retrieve the current cluster data",
+}
+
+type clusterdataOptions struct {
+	pretty bool
+}
+
+var clusterdataOpts clusterdataOptions
+
+func init() {
+	cmdClusterData.PersistentFlags().BoolVar(&clusterdataOpts.pretty, "pretty", false, "pretty print")
+
+	cmdStolonCtl.AddCommand(cmdClusterData)
+}
+
+func clusterdata(cmd *cobra.Command, args []string) {
+	e, err := NewStore()
+	if err != nil {
+		die("cannot create store: %v", err)
+	}
+
+	cd, _, err := getClusterData(e)
+	if err != nil {
+		die("%v", err)
+	}
+	if cd.Cluster == nil {
+		die("no cluster clusterdata available")
+	}
+	var clusterdataj []byte
+	if clusterdataOpts.pretty {
+		clusterdataj, err = json.MarshalIndent(cd, "", "\t")
+		if err != nil {
+			die("failed to marshall clusterdata: %v", err)
+		}
+	} else {
+		clusterdataj, err = json.Marshal(cd)
+		if err != nil {
+			die("failed to marshall clusterdata: %v", err)
+		}
+	}
+	stdout("%s", clusterdataj)
+}