frostfs-node/pkg/local_object_storage/metabase/iterators.go
Leonard Lyubich 182df23859 [#378] metabase: Implement iterator over expired objects
Implement `DB.IterateExpired` method that iterates over the objects in
metabase that are expired at particular epoch.

Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
2021-02-19 11:56:32 +03:00

111 lines
2.7 KiB
Go

package meta
import (
"strconv"
"github.com/nspcc-dev/neofs-api-go/pkg/container"
"github.com/nspcc-dev/neofs-api-go/pkg/object"
objectV2 "github.com/nspcc-dev/neofs-api-go/v2/object"
"github.com/pkg/errors"
"go.etcd.io/bbolt"
)
// ExpiredObject is a descriptor of expired object from DB.
type ExpiredObject struct {
typ object.Type
addr *object.Address
}
// Type returns type of the expired object.
func (e *ExpiredObject) Type() object.Type {
return e.typ
}
// Address returns address of the expired object.
func (e *ExpiredObject) Address() *object.Address {
return e.addr
}
// ExpiredObjectHandler is an ExpiredObject handling function.
type ExpiredObjectHandler func(*ExpiredObject) error
// ErrInterruptIterator is returned by iteration handlers
// as a "break" keyword.
var ErrInterruptIterator = errors.New("iterator is interrupted")
// IterateExpired iterates over all objects in DB which are out of date
// relative to epoch.
//
// If h returns ErrInterruptIterator, nil returns immediately.
// Returns other errors of h directly.
func (db *DB) IterateExpired(epoch uint64, h ExpiredObjectHandler) error {
return db.boltDB.View(func(tx *bbolt.Tx) error {
return db.iterateExpired(tx, epoch, h)
})
}
func (db *DB) iterateExpired(tx *bbolt.Tx, epoch uint64, h ExpiredObjectHandler) error {
err := tx.ForEach(func(name []byte, b *bbolt.Bucket) error {
cidBytes := cidFromAttributeBucket(name, objectV2.SysAttributeExpEpoch)
if cidBytes == nil {
return nil
}
return b.ForEach(func(expKey, _ []byte) error {
bktExpired := b.Bucket(expKey)
if bktExpired == nil {
return nil
}
return bktExpired.ForEach(func(idKey, _ []byte) error {
expiresAt, err := strconv.ParseUint(string(expKey), 10, 64)
if err != nil {
return errors.Wrap(err, "could not parse expiration epoch")
} else if expiresAt >= epoch {
return nil
}
id := object.NewID()
err = id.Parse(string(idKey))
if err != nil {
return errors.Wrap(err, "could not parse ID of expired object")
}
cid := container.NewID()
err = cid.Parse(string(cidBytes))
if err != nil {
return errors.Wrap(err, "could not parse container ID of expired bucket")
}
addr := object.NewAddress()
addr.SetContainerID(cid)
addr.SetObjectID(id)
return h(&ExpiredObject{
typ: objectType(tx, cid, idKey),
addr: addr,
})
})
})
})
if errors.Is(err, ErrInterruptIterator) {
err = nil
}
return err
}
func objectType(tx *bbolt.Tx, cid *container.ID, oidBytes []byte) object.Type {
switch {
default:
return object.TypeRegular
case inBucket(tx, tombstoneBucketName(cid), oidBytes):
return object.TypeTombstone
case inBucket(tx, storageGroupBucketName(cid), oidBytes):
return object.TypeStorageGroup
}
}