[#216] blobovnicza: Implement main methods and logic

Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>

pkg/local_object_storage/blobovnicza/delete.go

@@ -0,0 +1,69 @@
+package blobovnicza
+
+import (
+	objectSDK "github.com/nspcc-dev/neofs-api-go/pkg/object"
+	"go.etcd.io/bbolt"
+	"go.uber.org/zap"
+)
+
+// DeletePrm groups the parameters of Delete operation.
+type DeletePrm struct {
+	addr *objectSDK.Address
+}
+
+// DeleteRes groups resulting values of Delete operation.
+type DeleteRes struct {
+}
+
+// SetAddress sets address of the requested object.
+func (p *DeletePrm) SetAddress(addr *objectSDK.Address) {
+	p.addr = addr
+}
+
+// Delete removes object from Blobovnicza by address.
+//
+// Returns any error encountered that
+// did not allow to completely delete the object.
+//
+// Returns ErrObjectNotFound if the object to be deleted is not in blobovnicza.
+func (b *Blobovnicza) Delete(prm *DeletePrm) (*DeleteRes, error) {
+	addrKey := addressKey(prm.addr)
+
+	removed := false
+
+	err := b.boltDB.Update(func(tx *bbolt.Tx) error {
+		return b.iterateBuckets(tx, func(lower, upper uint64, buck *bbolt.Bucket) (bool, error) {
+			objData := buck.Get(addrKey)
+			if objData == nil {
+				// object is not in bucket => continue iterating
+				return false, nil
+			}
+
+			sz := uint64(len(objData))
+
+			// decrease fullness counter
+			b.decSize(sz)
+
+			// remove object from the bucket
+			err := buck.Delete(addrKey)
+
+			if err == nil {
+				b.log.Debug("object was removed from bucket",
+					zap.String("binary size", stringifyByteSize(sz)),
+					zap.String("range", stringifyBounds(lower, upper)),
+				)
+			}
+
+			removed = true
+
+			// stop iteration
+			return true, err
+		})
+	})
+
+	if err == nil && !removed {
+		err = ErrObjectNotFound
+	}
+
+	return nil, err
+}