frostfs-node/pkg/local_object_storage/metabase/containers.go
Pavel Karpy fdeea1dfac [#2057] meta: Fix concurrent mode changes
Includes:
1. mode change read lock operation in every exported method that r/w the
underlying database;
2. returning `ErrDegradedMode` logical error if any exported method is
called in degraded (without a metabase) mode.

Signed-off-by: Pavel Karpy <carpawell@nspcc.ru>
2022-11-19 11:01:04 +03:00

106 lines
2.2 KiB
Go

package meta
import (
"encoding/binary"
cid "github.com/nspcc-dev/neofs-sdk-go/container/id"
"go.etcd.io/bbolt"
)
func (db *DB) Containers() (list []cid.ID, err error) {
db.modeMtx.RLock()
defer db.modeMtx.RUnlock()
if db.mode.NoMetabase() {
return nil, ErrDegradedMode
}
err = db.boltDB.View(func(tx *bbolt.Tx) error {
list, err = db.containers(tx)
return err
})
return list, err
}
func (db *DB) containers(tx *bbolt.Tx) ([]cid.ID, error) {
result := make([]cid.ID, 0)
unique := make(map[string]struct{})
var cnr cid.ID
err := tx.ForEach(func(name []byte, _ *bbolt.Bucket) error {
if parseContainerID(&cnr, name, unique) {
result = append(result, cnr)
unique[string(name[1:bucketKeySize])] = struct{}{}
}
return nil
})
return result, err
}
func (db *DB) ContainerSize(id cid.ID) (size uint64, err error) {
db.modeMtx.RLock()
defer db.modeMtx.RUnlock()
if db.mode.NoMetabase() {
return 0, ErrDegradedMode
}
err = db.boltDB.View(func(tx *bbolt.Tx) error {
size, err = db.containerSize(tx, id)
return err
})
return size, err
}
func (db *DB) containerSize(tx *bbolt.Tx, id cid.ID) (uint64, error) {
containerVolume := tx.Bucket(containerVolumeBucketName)
key := make([]byte, cidSize)
id.Encode(key)
return parseContainerSize(containerVolume.Get(key)), nil
}
func parseContainerID(dst *cid.ID, name []byte, ignore map[string]struct{}) bool {
if len(name) != bucketKeySize {
return false
}
if _, ok := ignore[string(name[1:bucketKeySize])]; ok {
return false
}
return dst.Decode(name[1:bucketKeySize]) == nil
}
func parseContainerSize(v []byte) uint64 {
if len(v) == 0 {
return 0
}
return binary.LittleEndian.Uint64(v)
}
func changeContainerSize(tx *bbolt.Tx, id cid.ID, delta uint64, increase bool) error {
containerVolume := tx.Bucket(containerVolumeBucketName)
key := make([]byte, cidSize)
id.Encode(key)
size := parseContainerSize(containerVolume.Get(key))
if increase {
size += delta
} else if size > delta {
size -= delta
} else {
size = 0
}
buf := make([]byte, 8) // consider using sync.Pool to decrease allocations
binary.LittleEndian.PutUint64(buf, size)
return containerVolume.Put(key, buf)
}