main_resources.go

// Copyright 2024 Humanitec
//
// 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"
	"fmt"
	"text/template"

	"github.com/Masterminds/sprig/v3"
	"github.com/score-spec/score-go/framework"
	"github.com/spf13/cobra"
	"gopkg.in/yaml.v3"

	"github.com/score-spec/score-k8s/internal/project"
)

const (
	getOutputsCmdFormatFlag = "format"
)

var (
	resourcesGroup = &cobra.Command{
		Use:   "resources",
		Short: "Subcommands related to provisioned resources",
	}
	listResources = &cobra.Command{
		Use:   "list",
		Short: "List the resource uids",
		Long: `The list command will list out the provisioned resource uids. This requires an active score-k8s state
after 'init' or 'generate' has been run. The list of uids will be empty if no resources are provisioned.
`,
		Args:          cobra.ExactArgs(0),
		SilenceErrors: true,
		RunE: func(cmd *cobra.Command, args []string) error {
			cmd.SilenceUsage = true
			sd, ok, err := project.LoadStateDirectory(".")
			if err != nil {
				return fmt.Errorf("failed to load existing state directory: %w", err)
			} else if !ok {
				return fmt.Errorf("state directory does not exist, please run \"score-k8s init\" first")
			}
			currentState := &sd.State
			resIds, err := currentState.GetSortedResourceUids()
			if err != nil {
				return fmt.Errorf("failed to sort resources: %w", err)
			}
			for _, id := range resIds {
				_, _ = cmd.OutOrStdout().Write([]byte(id))
				_, _ = cmd.OutOrStdout().Write([]byte("\n"))
			}
			return nil
		},
	}
	getResourceOutputs = &cobra.Command{
		Use:   "get-outputs TYPE.CLASS#ID",
		Short: "Return the resource outputs",
		Long: `The get-outputs command will print the outputs of the resource from the last provisioning. The data will
be returned as json.
`,
		Args:          cobra.ExactArgs(1),
		SilenceErrors: true,
		RunE: func(cmd *cobra.Command, args []string) error {
			cmd.SilenceUsage = true
			sd, ok, err := project.LoadStateDirectory(".")
			if err != nil {
				return fmt.Errorf("failed to load existing state directory: %w", err)
			} else if !ok {
				return fmt.Errorf("state directory does not exist, please run \"score-k8s init\" first")
			}
			if res, ok := sd.State.Resources[framework.ResourceUid(args[0])]; ok {
				outputs := res.Outputs
				if outputs == nil {
					outputs = make(map[string]interface{})
				}
				formatValue := cmd.Flags().Lookup(getOutputsCmdFormatFlag).Value.String()
				switch formatValue {
				case "json":
					return json.NewEncoder(cmd.OutOrStdout()).Encode(outputs)
				case "yaml":
					return yaml.NewEncoder(cmd.OutOrStdout()).Encode(outputs)
				default:
					prepared, err := template.New("").Funcs(sprig.FuncMap()).Parse(formatValue)
					if err != nil {
						return fmt.Errorf("failed to parse format template: %w", err)
					}
					if err := prepared.Execute(cmd.OutOrStdout(), outputs); err != nil {
						return fmt.Errorf("failed to execute template: %w", err)
					}
					return nil
				}
			}
			return fmt.Errorf("no such resource '%s'", args[0])
		},
	}
)

func init() {
	getResourceOutputs.Flags().StringP(getOutputsCmdFormatFlag, "f", "json", "Format of the output: json, yaml, or a Go template with sprig functions")

	resourcesGroup.AddCommand(listResources)
	resourcesGroup.AddCommand(getResourceOutputs)

	rootCmd.AddCommand(resourcesGroup)
}