first commit

provider/lru/provider.go

@@ -0,0 +1,66 @@
+package lru
+
+import (
+	"context"
+	"fmt"
+	"time"
+
+	lru "github.com/hashicorp/golang-lru"
+	"gitoa.ru/go-4devs/cache"
+)
+
+// New create new lru cache provider.
+func New(client *lru.Cache) cache.Provider {
+	return func(ctx context.Context, operation string, item *cache.Item) error {
+		switch operation {
+		case cache.OperationGet:
+			val, ok := client.Get(item.Key)
+			if !ok {
+				return wrapErr(cache.ErrCacheMiss)
+			}
+
+			it, _ := val.(expired)
+
+			if !it.ex.IsZero() {
+				item.TTL = time.Until(it.ex)
+			}
+
+			if item.IsExpired() {
+				return wrapErr(cache.ErrCacheExpired)
+			}
+
+			return wrapErr(cache.TypeAssert(it.value, item.Value))
+		case cache.OperationSet:
+			it := expired{
+				value: item.Value,
+				ex:    time.Time{},
+			}
+			if item.TTL > 0 {
+				it.ex = item.Expired()
+			}
+
+			_ = client.Add(item.Key, it)
+
+			return nil
+		case cache.OperationDelete:
+			_ = client.Remove(item.Key)
+
+			return nil
+		}
+
+		return wrapErr(cache.ErrOperationNotAllwed)
+	}
+}
+
+type expired struct {
+	ex    time.Time
+	value interface{}
+}
+
+func wrapErr(err error) error {
+	if err != nil {
+		return fmt.Errorf("%w: lru", err)
+	}
+
+	return nil
+}

provider/lru/provider_test.go

@@ -0,0 +1,18 @@
+package lru_test
+
+import (
+	"testing"
+
+	glru "github.com/hashicorp/golang-lru"
+	"github.com/stretchr/testify/require"
+	"gitoa.ru/go-4devs/cache/provider/lru"
+	"gitoa.ru/go-4devs/cache/test"
+)
+
+func TestEncoding(t *testing.T) {
+	t.Parallel()
+
+	client, err := glru.New(10)
+	require.Nil(t, err)
+	test.RunSute(t, lru.New(client))
+}