[#421] Try using badger for the write-cache

Signed-off-by: Alejandro Lopez <a.lopez@yadro.com>

pkg/local_object_storage/writecache/writecachebadger/delete.go

@@ -0,0 +1,70 @@
+package writecachebadger
+
+import (
+	"context"
+	"time"
+
+	storagelog "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/internal/log"
+	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/internal/metaerr"
+	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/util/logicerr"
+	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/writecache"
+	"git.frostfs.info/TrueCloudLab/frostfs-observability/tracing"
+	apistatus "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/client/status"
+	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
+	"github.com/dgraph-io/badger/v4"
+	"go.opentelemetry.io/otel/attribute"
+	"go.opentelemetry.io/otel/trace"
+)
+
+// Delete removes object from write-cache.
+//
+// Returns an error of type apistatus.ObjectNotFound if object is missing in write-cache.
+func (c *cache) Delete(ctx context.Context, addr oid.Address) error {
+	_, span := tracing.StartSpanFromContext(ctx, "writecache.Delete",
+		trace.WithAttributes(
+			attribute.String("address", addr.EncodeToString()),
+		))
+	defer span.End()
+
+	deleted := false
+	storageType := writecache.StorageTypeUndefined
+	startedAt := time.Now()
+	defer func() {
+		c.metrics.Delete(time.Since(startedAt), deleted, storageType)
+	}()
+
+	c.modeMtx.RLock()
+	defer c.modeMtx.RUnlock()
+	if c.readOnly() {
+		return writecache.ErrReadOnly
+	}
+
+	saddr := addr.EncodeToString()
+
+	err := c.db.Update(func(tx *badger.Txn) error {
+		it, err := tx.Get([]byte(saddr))
+		if err != nil {
+			if err == badger.ErrKeyNotFound {
+				return logicerr.Wrap(apistatus.ObjectNotFound{})
+			}
+			return err
+		}
+		if it.ValueSize() > 0 {
+			storageType = writecache.StorageTypeDB
+			err := tx.Delete([]byte(saddr))
+			if err == nil {
+				storagelog.Write(c.log,
+					storagelog.AddressField(saddr),
+					storagelog.StorageTypeField(wcStorageType),
+					storagelog.OpField("db DELETE"),
+				)
+				deleted = true
+				c.objCounters.DecDB()
+			}
+			return err
+		}
+		return nil
+	})
+
+	return metaerr.Wrap(err)
+}