[#1559] local_object_storage: Allow to set mode for all components

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

pkg/local_object_storage/blobstor/blobovnicza.go

@@ -835,6 +835,11 @@ func (b *blobovniczas) init() error {
 		return zstdD(data)
 	}
 
+	if b.readOnly {
+		b.log.Debug("read-only mode, skip blobovniczas initialization...")
+		return nil
+	}
+
 	return b.iterateBlobovniczas(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)

pkg/local_object_storage/blobstor/blobstor.go

@@ -4,9 +4,11 @@ import (
 	"encoding/hex"
 	"io/fs"
 	"path/filepath"
+	"sync"
 
 	"github.com/nspcc-dev/neofs-node/pkg/local_object_storage/blobovnicza"
 	"github.com/nspcc-dev/neofs-node/pkg/local_object_storage/blobstor/fstree"
+	"github.com/nspcc-dev/neofs-node/pkg/local_object_storage/shard/mode"
 	"github.com/nspcc-dev/neofs-node/pkg/util/logger"
 	"go.uber.org/zap"
 )
@@ -16,6 +18,9 @@ type BlobStor struct {
 	*cfg
 
 	blobovniczas *blobovniczas
+
+	modeMtx sync.RWMutex
+	mode    mode.Mode
 }
 
 type Info = fstree.Info

pkg/local_object_storage/blobstor/mode.go

@@ -0,0 +1,35 @@
+package blobstor
+
+import (
+	"fmt"
+
+	"github.com/nspcc-dev/neofs-node/pkg/local_object_storage/shard/mode"
+)
+
+// SetMode sets the blobstor mode of operation.
+func (b *BlobStor) SetMode(m mode.Mode) error {
+	b.modeMtx.Lock()
+	defer b.modeMtx.Unlock()
+
+	if b.mode == m {
+		return nil
+	}
+
+	if b.mode.ReadOnly() == m.ReadOnly() {
+		return nil
+	}
+
+	err := b.Close()
+	if err == nil {
+		if err = b.Open(m.ReadOnly()); err == nil {
+			err = b.Init()
+		}
+	}
+	if err != nil {
+		return fmt.Errorf("can't set blobstor mode (old=%s, new=%s): %w", b.mode, m, err)
+	}
+
+	b.blobovniczas.readOnly = m.ReadOnly()
+	b.mode = m
+	return nil
+}