Implemented getAlbumList with type=random

engine/list_generator.go

@@ -1,6 +1,8 @@
 package engine
 
 import (
+	"math/rand"
+
 	"github.com/deluan/gosonic/domain"
 )
 
@@ -9,6 +11,7 @@ type ListGenerator interface {
 	GetRecent(offset int, size int) (*domain.Albums, error)
 	GetFrequent(offset int, size int) (*domain.Albums, error)
 	GetHighest(offset int, size int) (*domain.Albums, error)
+	GetRandom(offset int, size int) (*domain.Albums, error)
 }
 
 func NewListGenerator(alr domain.AlbumRepository) ListGenerator {
@@ -44,3 +47,21 @@ func (g listGenerator) GetHighest(offset int, size int) (*domain.Albums, error)
 	qo := domain.QueryOptions{SortBy: "Rating", Desc: true}
 	return g.query(qo, offset, size)
 }
+
+func (g listGenerator) GetRandom(offset int, size int) (*domain.Albums, error) {
+	ids, err := g.albumRepo.GetAllIds()
+	if err != nil {
+		return nil, err
+	}
+	r := make(domain.Albums, len(*ids))
+	perm := rand.Perm(len(*ids))
+
+	for i, v := range perm {
+		al, err := g.albumRepo.Get((*ids)[v])
+		if err != nil {
+			return nil, err
+		}
+		r[i] = *al
+	}
+	return &r, nil
+}