[#1559] local_object_storage: Provide readOnly flag to Open

We should be able to reopen storage in readonly in runtime.

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

pkg/local_object_storage/writecache/storage.go

@@ -27,13 +27,13 @@ const lruKeysCount = 256 * 1024 * 8
 
 const dbName = "small.bolt"
 
-func (c *cache) openStore() error {
+func (c *cache) openStore(readOnly bool) error {
 	err := util.MkdirAllX(c.path, os.ModePerm)
 	if err != nil {
 		return err
 	}
 
-	c.db, err = OpenDB(c.path, false)
+	c.db, err = OpenDB(c.path, readOnly)
 	if err != nil {
 		return fmt.Errorf("could not open database: %w", err)
 	}

pkg/local_object_storage/writecache/writecache.go

@@ -29,7 +29,7 @@ type Cache interface {
 	DumpInfo() Info
 
 	Init() error
-	Open() error
+	Open(readOnly bool) error
 	Close() error
 }
 
@@ -125,8 +125,8 @@ func (c *cache) DumpInfo() Info {
 }
 
 // Open opens and initializes database. Reads object counters from the ObjectCounters instance.
-func (c *cache) Open() error {
-	err := c.openStore()
+func (c *cache) Open(readOnly bool) error {
+	err := c.openStore(readOnly)
 	if err != nil {
 		return err
 	}