[#176] localstore: Implement primary BlobStor

Implement primary local BLOB storage based on filesystem tree.

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

pkg/local_object_storage/blobstor/delete.go

@@ -0,0 +1,54 @@
+package blobstor
+
+import (
+	"os"
+
+	"github.com/nspcc-dev/neofs-api-go/pkg/object"
+	objectSDK "github.com/nspcc-dev/neofs-api-go/pkg/object"
+	"github.com/pkg/errors"
+)
+
+// DeletePrm groups the parameters of Delete operation.
+type DeletePrm struct {
+	addr *objectSDK.Address
+}
+
+// DeleteRes groups resulting values of Delete operation.
+type DeleteRes struct{}
+
+// WithAddress is a Delete option to set the address of the object to delete.
+//
+// Option is required.
+func (p *DeletePrm) WithAddress(addr *objectSDK.Address) *DeletePrm {
+	if p != nil {
+		p.addr = addr
+	}
+
+	return p
+}
+
+// Delete removes object from BLOB storage.
+//
+// Returns any error encountered that did not allow
+// to completely remove the object.
+func (b *BlobStor) Delete(prm *DeletePrm) (*DeleteRes, error) {
+	b.mtx.Lock()
+	defer b.mtx.Unlock()
+
+	err := b.fsTree.delete(prm.addr)
+	if errors.Is(err, errFileNotFound) {
+		err = nil
+	}
+
+	return nil, err
+}
+
+func (t *fsTree) delete(addr *object.Address) error {
+	p := t.treePath(addr)
+
+	if _, err := os.Stat(p); os.IsNotExist(err) {
+		return errFileNotFound
+	}
+
+	return os.Remove(p)
+}