[#236] api: Refactor caches: ObjectsList, Objects

Move ObjectsList from layer to cache package
Rename object_cache.go to objects.go

Signed-off-by: Angira Kekteeva <kira@nspcc.ru>

api/cache/objectslist_test.go

@@ -0,0 +1,132 @@
+package cache
+
+import (
+	"crypto/rand"
+	"crypto/sha256"
+	"sort"
+	"testing"
+	"time"
+
+	"github.com/nspcc-dev/neofs-api-go/pkg/object"
+	"github.com/nspcc-dev/neofs-s3-gw/api"
+	"github.com/stretchr/testify/require"
+)
+
+const testingCacheLifetime = 5 * time.Second
+
+func randID(t *testing.T) *object.ID {
+	id := object.NewID()
+	id.SetSHA256(randSHA256Checksum(t))
+
+	return id
+}
+
+func randSHA256Checksum(t *testing.T) (cs [sha256.Size]byte) {
+	_, err := rand.Read(cs[:])
+	require.NoError(t, err)
+
+	return
+}
+
+func TestObjectsListCache(t *testing.T) {
+	var (
+		cacheSize = 10
+		objects   []*api.ObjectInfo
+		userKey   = "key"
+	)
+
+	for i := 0; i < cacheSize; i++ {
+		id := randID(t)
+		objects = append(objects, &api.ObjectInfo{ID: id, Name: id.String()})
+	}
+
+	sort.Slice(objects, func(i, j int) bool {
+		return objects[i].Name < objects[j].Name
+	})
+
+	t.Run("lifetime", func(t *testing.T) {
+		var (
+			cache    = NewObjectsListCache(testingCacheLifetime)
+			cacheKey = ObjectsListKey{Key: userKey}
+		)
+
+		cache.Put(cacheKey, objects)
+
+		condition := func() bool {
+			return cache.Get(cacheKey) == nil
+		}
+
+		require.Never(t, condition, cache.cacheLifetime, time.Second)
+		require.Eventually(t, condition, time.Second, 10*time.Millisecond)
+	})
+
+	t.Run("get cache with empty delimiter, empty prefix", func(t *testing.T) {
+		var (
+			cache    = NewObjectsListCache(testingCacheLifetime)
+			cacheKey = ObjectsListKey{Key: userKey}
+		)
+		cache.Put(cacheKey, objects)
+		actual := cache.Get(cacheKey)
+
+		require.Equal(t, len(objects), len(actual))
+		for i := range objects {
+			require.Equal(t, objects[i], actual[i])
+		}
+	})
+
+	t.Run("get cache with delimiter and prefix", func(t *testing.T) {
+		cacheKey := ObjectsListKey{
+			Key:       userKey,
+			Delimiter: "/",
+			Prefix:    "dir",
+		}
+
+		cache := NewObjectsListCache(testingCacheLifetime)
+		cache.Put(cacheKey, objects)
+		actual := cache.Get(cacheKey)
+
+		require.Equal(t, len(objects), len(actual))
+		for i := range objects {
+			require.Equal(t, objects[i], actual[i])
+		}
+	})
+
+	t.Run("get cache with other delimiter and prefix", func(t *testing.T) {
+		var (
+			cacheKey = ObjectsListKey{
+				Key:       userKey,
+				Delimiter: "/",
+				Prefix:    "dir",
+			}
+
+			newKey = ObjectsListKey{
+				Key:       "key",
+				Delimiter: "*",
+				Prefix:    "obj",
+			}
+		)
+
+		cache := NewObjectsListCache(testingCacheLifetime)
+		cache.Put(cacheKey, objects)
+
+		actual := cache.Get(newKey)
+		require.Nil(t, actual)
+	})
+
+	t.Run("get cache with non-existing key", func(t *testing.T) {
+		var (
+			cacheKey = ObjectsListKey{
+				Key: userKey,
+			}
+			newKey = ObjectsListKey{
+				Key: "asdf",
+			}
+		)
+
+		cache := NewObjectsListCache(testingCacheLifetime)
+		cache.Put(cacheKey, objects)
+
+		actual := cache.Get(newKey)
+		require.Nil(t, actual)
+	})
+}