forked from TrueCloudLab/frostfs-node
59 lines
1.2 KiB
Go
59 lines
1.2 KiB
Go
package meta
|
|
|
|
import (
|
|
"encoding/binary"
|
|
|
|
"go.etcd.io/bbolt"
|
|
)
|
|
|
|
var shardCounterKey = []byte("counter")
|
|
|
|
// ObjectCounter returns object count that metabase has
|
|
// tracked since it was opened and initialized.
|
|
//
|
|
// Returns only the errors that do not allow reading counter
|
|
// in Bolt database.
|
|
func (db *DB) ObjectCounter() (counter uint64, err error) {
|
|
err = db.boltDB.View(func(tx *bbolt.Tx) error {
|
|
b := tx.Bucket(shardInfoBucket)
|
|
if b != nil {
|
|
data := b.Get(shardCounterKey)
|
|
if len(data) == 8 {
|
|
counter = binary.LittleEndian.Uint64(data)
|
|
}
|
|
}
|
|
|
|
return nil
|
|
})
|
|
|
|
return
|
|
}
|
|
|
|
// updateCounter updates the object counter. Tx MUST be writable.
|
|
// If inc == `true`, increases the counter, decreases otherwise.
|
|
func (db *DB) updateCounter(tx *bbolt.Tx, delta uint64, inc bool) error {
|
|
b := tx.Bucket(shardInfoBucket)
|
|
if b == nil {
|
|
return nil
|
|
}
|
|
|
|
var counter uint64
|
|
|
|
data := b.Get(shardCounterKey)
|
|
if len(data) == 8 {
|
|
counter = binary.LittleEndian.Uint64(data)
|
|
}
|
|
|
|
if inc {
|
|
counter += delta
|
|
} else if counter <= delta {
|
|
counter = 0
|
|
} else {
|
|
counter -= delta
|
|
}
|
|
|
|
newCounter := make([]byte, 8)
|
|
binary.LittleEndian.PutUint64(newCounter, counter)
|
|
|
|
return b.Put(shardCounterKey, newCounter)
|
|
}
|