[#1523] local_object_storage: Move blobovnicza tree to a separate package

Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>

pkg/local_object_storage/blobstor/blobovniczatree/control.go

@@ -0,0 +1,86 @@
+package blobovniczatree
+
+import (
+	"fmt"
+
+	"github.com/nspcc-dev/neofs-node/pkg/local_object_storage/blobovnicza"
+	"go.uber.org/zap"
+)
+
+// Open opens blobovnicza tree.
+func (b *Blobovniczas) Open(readOnly bool) error {
+	b.readOnly = readOnly
+	return nil
+}
+
+// Init initializes blobovnicza tree.
+//
+// Should be called exactly once.
+func (b *Blobovniczas) Init() error {
+	b.log.Debug("initializing Blobovnicza's")
+
+	err := b.CConfig.Init()
+	if err != nil {
+		return err
+	}
+	b.onClose = append(b.onClose, func() {
+		if err := b.CConfig.Close(); err != nil {
+			b.log.Debug("can't close zstd compressor", zap.String("err", err.Error()))
+		}
+	})
+
+	if b.readOnly {
+		b.log.Debug("read-only mode, skip blobovniczas initialization...")
+		return nil
+	}
+
+	return b.Iterate(false, func(p string, blz *blobovnicza.Blobovnicza) error {
+		if err := blz.Init(); err != nil {
+			return fmt.Errorf("could not initialize blobovnicza structure %s: %w", p, err)
+		}
+
+		b.log.Debug("blobovnicza successfully initialized, closing...", zap.String("id", p))
+
+		return nil
+	})
+}
+
+// closes blobovnicza tree.
+func (b *Blobovniczas) Close() error {
+	b.activeMtx.Lock()
+
+	b.lruMtx.Lock()
+
+	for p, v := range b.active {
+		if err := v.blz.Close(); err != nil {
+			b.log.Debug("could not close active blobovnicza",
+				zap.String("path", p),
+				zap.String("error", err.Error()),
+			)
+		}
+		b.opened.Remove(p)
+	}
+	for _, k := range b.opened.Keys() {
+		v, _ := b.opened.Get(k)
+		blz := v.(*blobovnicza.Blobovnicza)
+		if err := blz.Close(); err != nil {
+			b.log.Debug("could not close active blobovnicza",
+				zap.String("path", k.(string)),
+				zap.String("error", err.Error()),
+			)
+		}
+		b.opened.Remove(k)
+	}
+
+	b.active = make(map[string]blobovniczaWithIndex)
+
+	b.lruMtx.Unlock()
+
+	b.activeMtx.Unlock()
+
+	for i := range b.onClose {
+		b.onClose[i]()
+	}
+
+	return nil
+}