consul/internal/resource/demo/demo.go

// Package demo includes fake resource types for working on Consul's generic
// state storage without having to refer to specific features.
package demo

import (
	"fmt"
	"math/rand"
	"strings"
	"time"

	"google.golang.org/protobuf/types/known/anypb"

	"github.com/hashicorp/consul/internal/resource"
	"github.com/hashicorp/consul/proto-public/pbresource"
	pbdemov1 "github.com/hashicorp/consul/proto/private/pbdemo/v1"
	pbdemov2 "github.com/hashicorp/consul/proto/private/pbdemo/v2"
)

var (
	// TenancyDefault contains the default values for all tenancy units.
	TenancyDefault = &pbresource.Tenancy{
		Partition: "default",
		PeerName:  "local",
		Namespace: "default",
	}

	// TypeV1Artist represents a musician or group of musicians.
	TypeV1Artist = &pbresource.Type{
		Group:        "demo",
		GroupVersion: "v1",
		Kind:         "artist",
	}

	// TypeV1Album represents a collection of an artist's songs.
	TypeV1Album = &pbresource.Type{
		Group:        "demo",
		GroupVersion: "v1",
		Kind:         "album",
	}

	// TypeV2Artist represents a musician or group of musicians.
	TypeV2Artist = &pbresource.Type{
		Group:        "demo",
		GroupVersion: "v2",
		Kind:         "artist",
	}

	// TypeV2Album represents a collection of an artist's songs.
	TypeV2Album = &pbresource.Type{
		Group:        "demo",
		GroupVersion: "v2",
		Kind:         "album",
	}
)

// Register demo types. Should only be called in tests and dev mode.
func Register(r resource.Registry) {
	r.Register(resource.Registration{
		Type:  TypeV1Artist,
		Proto: &pbdemov1.Artist{},
	})

	r.Register(resource.Registration{
		Type:  TypeV1Album,
		Proto: &pbdemov1.Album{},
	})

	r.Register(resource.Registration{
		Type:  TypeV2Artist,
		Proto: &pbdemov2.Artist{},
	})

	r.Register(resource.Registration{
		Type:  TypeV2Album,
		Proto: &pbdemov2.Album{},
	})
}

// GenerateV2Artist generates a random Artist resource.
func GenerateV2Artist() (*pbresource.Resource, error) {
	adjective := adjectives[rand.Intn(len(adjectives))]
	noun := nouns[rand.Intn(len(nouns))]

	numMembers := rand.Intn(5) + 1
	groupMembers := make(map[string]string, numMembers)
	for i := 0; i < numMembers; i++ {
		groupMembers[members[rand.Intn(len(members))]] = instruments[rand.Intn(len(instruments))]
	}

	data, err := anypb.New(&pbdemov2.Artist{
		Name:         fmt.Sprintf("%s %s", adjective, noun),
		Genre:        randomGenre(),
		GroupMembers: groupMembers,
	})
	if err != nil {
		return nil, err
	}

	return &pbresource.Resource{
		Id: &pbresource.ID{
			Type:    TypeV2Artist,
			Tenancy: TenancyDefault,
			Name:    fmt.Sprintf("%s-%s", strings.ToLower(adjective), strings.ToLower(noun)),
		},
		Data: data,
		Metadata: map[string]string{
			"generated_at": time.Now().Format(time.RFC3339),
		},
	}, nil
}

// GenerateV2Album generates a random Album resource, owned by the Artist with
// the given ID.
func GenerateV2Album(artistID *pbresource.ID) (*pbresource.Resource, error) {
	adjective := adjectives[rand.Intn(len(adjectives))]
	noun := nouns[rand.Intn(len(nouns))]

	numTracks := 3 + rand.Intn(3)
	tracks := make([]string, numTracks)
	for i := 0; i < numTracks; i++ {
		words := nouns
		if i%3 == 0 {
			words = adjectives
		}
		tracks[i] = words[rand.Intn(len(words))]
	}

	data, err := anypb.New(&pbdemov2.Album{
		Title:              fmt.Sprintf("%s %s", adjective, noun),
		YearOfRelease:      int32(1990 + rand.Intn(time.Now().Year()-1990)),
		CriticallyAclaimed: rand.Int()%2 == 0,
		Tracks:             tracks,
	})
	if err != nil {
		return nil, err
	}

	return &pbresource.Resource{
		Id: &pbresource.ID{
			Type:    TypeV2Album,
			Tenancy: artistID.Tenancy,
			Name:    fmt.Sprintf("%s/%s-%s", artistID.Name, strings.ToLower(adjective), strings.ToLower(noun)),
		},
		Owner: artistID,
		Data:  data,
		Metadata: map[string]string{
			"generated_at": time.Now().Format(time.RFC3339),
		},
	}, nil
}

func randomGenre() pbdemov2.Genre {
	return pbdemov2.Genre(rand.Intn(len(pbdemov1.Genre_name)-1) + 1)
}

var (
	adjectives = []string{
		"Purple",
		"Angry",
		"Euphoric",
		"Unexpected",
		"Cheesy",
		"Rancid",
		"Pleasant",
		"Mumbling",
		"Enlightened",
	}

	nouns = []string{
		"Speakerphone",
		"Fox",
		"Guppy",
		"Smile",
		"Emacs",
		"Grapefruit",
		"Engineer",
		"Basketball",
	}

	members = []string{
		"Owl",
		"Tiger",
		"Beetle",
		"Lion",
		"Chicken",
		"Snake",
		"Monkey",
		"Kitten",
		"Hound",
	}

	instruments = []string{
		"Guitar",
		"Bass",
		"Lead Vocals",
		"Backing Vocals",
		"Drums",
		"Synthesizer",
		"Triangle",
		"Standing by the stage looking cool",
	}
)