first commit

provider/pebble/provider.go

@@ -0,0 +1,54 @@
+package pebble
+
+import (
+	"context"
+	"errors"
+	"fmt"
+
+	"github.com/cockroachdb/pebble"
+	"gitoa.ru/go-4devs/cache"
+	"gitoa.ru/go-4devs/cache/item"
+)
+
+func New(db *pebble.DB) cache.Provider {
+	return func(ctx context.Context, operation string, i *cache.Item) error {
+		key := []byte(i.Key.String())
+
+		switch operation {
+		case cache.OperationGet:
+			val, cl, err := db.Get([]byte(i.Key.String()))
+			if err != nil {
+				if errors.Is(err, pebble.ErrNotFound) {
+					return wrapErr(cache.ErrCacheMiss)
+				}
+
+				return wrapErr(err)
+			}
+
+			defer func() {
+				_ = cl.Close()
+			}()
+
+			return wrapErr(item.UnmarshalExpired(i, val))
+		case cache.OperationSet:
+			b, err := item.MarshalExpired(i)
+			if err != nil {
+				return wrapErr(err)
+			}
+
+			return wrapErr(db.Set(key, b, pebble.Sync))
+		case cache.OperationDelete:
+			return wrapErr(db.Delete(key, pebble.Sync))
+		}
+
+		return wrapErr(cache.ErrOperationNotAllwed)
+	}
+}
+
+func wrapErr(err error) error {
+	if err != nil {
+		return fmt.Errorf("%w: pebble", err)
+	}
+
+	return nil
+}

provider/pebble/provider_test.go

@@ -0,0 +1,17 @@
+package pebble_test
+
+import (
+	"testing"
+
+	"gitoa.ru/go-4devs/cache/provider/pebble"
+	"gitoa.ru/go-4devs/cache/test"
+)
+
+func TestPebble(t *testing.T) {
+	t.Parallel()
+
+	db, cl := test.PebbleDB()
+	defer cl()
+
+	test.RunSute(t, pebble.New(db))
+}