frostfs-node/pkg/local_object_storage/metabase/mode.go

package meta

import (
	"fmt"

	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/shard/mode"
)

// SetMode sets the metabase mode of operation.
// If the mode assumes no operation metabase, the database is closed.
func (db *DB) SetMode(m mode.Mode) error {
	db.modeMtx.Lock()
	defer db.modeMtx.Unlock()

	if db.mode == m {
		return nil
	}

	if !db.mode.NoMetabase() {
		if err := db.Close(); err != nil {
			return fmt.Errorf("can't set metabase mode (old=%s, new=%s): %w", db.mode, m, err)
		}
	}

	if m.NoMetabase() {
		db.boltDB = nil
	} else {
		err := db.openDB(m)
		if err == nil && !m.ReadOnly() {
			err = db.Init()
		}
		if err != nil {
			return fmt.Errorf("can't set metabase mode (old=%s, new=%s): %w", db.mode, m, err)
		}
	}

	db.mode = m
	db.metrics.SetMode(mode.ConvertToComponentModeDegraded(m))
	return nil
}