frostfs-node/pkg/local_object_storage/metabase/control.go
Evgenii Stratonikov 1e786233bf [#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>
2022-07-21 17:56:06 +03:00

123 lines
3.1 KiB
Go

package meta
import (
"fmt"
"path/filepath"
"github.com/nspcc-dev/neofs-node/pkg/util"
"go.etcd.io/bbolt"
"go.uber.org/zap"
)
// Open boltDB instance for metabase.
func (db *DB) Open(readOnly bool) error {
err := util.MkdirAllX(filepath.Dir(db.info.Path), db.info.Permission)
if err != nil {
return fmt.Errorf("can't create dir %s for metabase: %w", db.info.Path, err)
}
db.log.Debug("created directory for Metabase", zap.String("path", db.info.Path))
if db.boltOptions == nil {
db.boltOptions = bbolt.DefaultOptions
}
db.boltOptions.ReadOnly = readOnly
db.boltDB, err = bbolt.Open(db.info.Path, db.info.Permission, db.boltOptions)
if err != nil {
return fmt.Errorf("can't open boltDB database: %w", err)
}
db.boltDB.MaxBatchDelay = db.boltBatchDelay
db.boltDB.MaxBatchSize = db.boltBatchSize
db.log.Debug("opened boltDB instance for Metabase")
db.log.Debug("checking metabase version")
return db.boltDB.View(func(tx *bbolt.Tx) error {
// The safest way to check if the metabase is fresh is to check if it has no buckets.
// However, shard info can be present. So here we check that the number of buckets is
// at most 1.
// Another thing to consider is that tests do not persist shard ID, we want to support
// this case too.
var n int
err := tx.ForEach(func([]byte, *bbolt.Bucket) error {
if n++; n >= 2 { // do not iterate a lot
return errBreakBucketForEach
}
return nil
})
if err == errBreakBucketForEach {
db.initialized = true
err = nil
}
return err
})
}
// Init initializes metabase. It creates static (CID-independent) buckets in underlying BoltDB instance.
//
// Does nothing if metabase has already been initialized and filled. To roll back the database to its initial state,
// use Reset.
func (db *DB) Init() error {
return db.init(false)
}
// Reset resets metabase. Works similar to Init but cleans up all static buckets and
// removes all dynamic (CID-dependent) ones in non-blank BoltDB instances.
func (db *DB) Reset() error {
return db.init(true)
}
func (db *DB) init(reset bool) error {
mStaticBuckets := map[string]struct{}{
string(containerVolumeBucketName): {},
string(graveyardBucketName): {},
string(toMoveItBucketName): {},
string(garbageBucketName): {},
}
return db.boltDB.Update(func(tx *bbolt.Tx) error {
var err error
if !reset {
// Normal open, check version and update if not initialized.
err := checkVersion(tx, db.initialized)
if err != nil {
return err
}
}
for k := range mStaticBuckets {
b, err := tx.CreateBucketIfNotExists([]byte(k))
if err != nil {
return fmt.Errorf("could not create static bucket %s: %w", k, err)
}
if reset {
if err = resetBucket(b); err != nil {
return fmt.Errorf("could not reset static bucket %s: %w", k, err)
}
}
}
if !reset {
return nil
}
err = tx.ForEach(func(name []byte, b *bbolt.Bucket) error {
if _, ok := mStaticBuckets[string(name)]; !ok {
return tx.DeleteBucket(name)
}
return nil
})
if err != nil {
return err
}
return updateVersion(tx, version)
})
}
// Close closes boltDB instance.
func (db *DB) Close() error {
return db.boltDB.Close()
}