info.go

// Copyright (c) 2018 SAP SE or an SAP affiliate company. All rights reserved. This file is licensed under the Apache Software License, v. 2 except as noted otherwise in the LICENSE file
//
// 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 (
	"errors"
	"fmt"
	"sort"

	"text/tabwriter"

	"github.com/spf13/cobra"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
)

// NewInfoCmd returns a new info command.
func NewInfoCmd(targetReader TargetReader, ioStreams IOStreams) *cobra.Command {
	return &cobra.Command{
		Use:          "info",
		Short:        "Get landscape informations and shows the number of shoots per seed, e.g. \"gardenctl info\"",
		SilenceUsage: true,
		RunE: func(cmd *cobra.Command, args []string) error {
			target := targetReader.ReadTarget(pathTarget)
			targetStack := target.Stack()
			if len(targetStack) < 1 {
				return errors.New("no garden cluster targeted")
			}

			// Show landscape
			gardenClientset, err := target.GardenerClient()
			if err != nil {
				return err
			}

			shootList, err := gardenClientset.CoreV1beta1().Shoots("").List(metav1.ListOptions{})
			if err != nil {
				return err
			}

			var (
				unscheduled                  = 0
				hibernatedShootsCount        = 0
				totalShootsCountPerSeed      = make(map[string]int)
				hibernatedShootsCountPerSeed = make(map[string]int)
			)

			for _, shoot := range shootList.Items {
				if shoot.Spec.SeedName == nil {
					unscheduled++
					continue
				}
				totalShootsCountPerSeed[*shoot.Spec.SeedName]++
				if shoot.Status.IsHibernated {
					hibernatedShootsCountPerSeed[*shoot.Spec.SeedName]++
					hibernatedShootsCount++
				}
			}

			var sortedSeeds []string
			for seed := range totalShootsCountPerSeed {
				sortedSeeds = append(sortedSeeds, seed)
			}
			sort.Strings(sortedSeeds)

			fmt.Fprintf(ioStreams.Out, "Garden: %s\n", targetStack[0].Name)

			w := tabwriter.NewWriter(ioStreams.Out, 6, 0, 20, ' ', 0)
			fmt.Fprintf(w, "%s\t%s\t%s\t%s\n", "Seed", "Total", "Active", "Hibernated")
			fmt.Fprintf(w, "%s\t%s\t%s\t%s\n", "----", "-----", "------", "----------")

			for _, seed := range sortedSeeds {
				fmt.Fprintf(w, "%s\t%d\t%d\t%d\n", seed, totalShootsCountPerSeed[seed], totalShootsCountPerSeed[seed]-hibernatedShootsCountPerSeed[seed], hibernatedShootsCountPerSeed[seed])
			}
			fmt.Fprintf(w, "%s\t%s\t%s\t%s\n", "----", "-----", "------", "----------")
			fmt.Fprintf(w, "%s\t%d\t%d\t%d\n", "TOTAL", len(shootList.Items), len(shootList.Items)-hibernatedShootsCount-unscheduled, hibernatedShootsCount)
			fmt.Fprintf(w, "%s\t%d\n", "Unscheduled", unscheduled)

			fmt.Fprintln(w)
			w.Flush()

			return nil
		},
	}
}