169 lines
4 KiB
Go
169 lines
4 KiB
Go
package meta
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import (
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"errors"
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"fmt"
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apistatus "github.com/nspcc-dev/neofs-sdk-go/client/status"
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cid "github.com/nspcc-dev/neofs-sdk-go/container/id"
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objectSDK "github.com/nspcc-dev/neofs-sdk-go/object"
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oid "github.com/nspcc-dev/neofs-sdk-go/object/id"
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"go.etcd.io/bbolt"
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)
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// ExistsPrm groups the parameters of Exists operation.
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type ExistsPrm struct {
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addr oid.Address
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}
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// ExistsRes groups the resulting values of Exists operation.
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type ExistsRes struct {
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exists bool
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}
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var ErrLackSplitInfo = errors.New("no split info on parent object")
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// WithAddress is an Exists option to set object checked for existence.
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func (p *ExistsPrm) WithAddress(addr oid.Address) {
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if p != nil {
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p.addr = addr
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}
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}
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// Exists returns the fact that the object is in the metabase.
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func (p *ExistsRes) Exists() bool {
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return p.exists
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}
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// Exists checks if object is presented in DB.
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//
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// See DB.Exists docs.
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func Exists(db *DB, addr oid.Address) (bool, error) {
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var existsPrm ExistsPrm
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existsPrm.WithAddress(addr)
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r, err := db.Exists(existsPrm)
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if err != nil {
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return false, err
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}
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return r.Exists(), nil
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}
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// Exists returns ErrAlreadyRemoved if addr was marked as removed. Otherwise it
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// returns true if addr is in primary index or false if it is not.
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//
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// Returns an error of type apistatus.ObjectAlreadyRemoved if object has been placed in graveyard.
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func (db *DB) Exists(prm ExistsPrm) (res *ExistsRes, err error) {
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res = new(ExistsRes)
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err = db.boltDB.View(func(tx *bbolt.Tx) error {
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res.exists, err = db.exists(tx, prm.addr)
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return err
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})
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return
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}
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func (db *DB) exists(tx *bbolt.Tx, addr oid.Address) (exists bool, err error) {
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// check graveyard first
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switch inGraveyard(tx, addr) {
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case 1:
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var errNotFound apistatus.ObjectNotFound
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return false, errNotFound
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case 2:
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var errRemoved apistatus.ObjectAlreadyRemoved
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return false, errRemoved
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}
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objKey := objectKey(addr.Object())
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cnr := addr.Container()
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// if graveyard is empty, then check if object exists in primary bucket
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if inBucket(tx, primaryBucketName(cnr), objKey) {
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return true, nil
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}
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// if primary bucket is empty, then check if object exists in parent bucket
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if inBucket(tx, parentBucketName(cnr), objKey) {
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splitInfo, err := getSplitInfo(tx, cnr, objKey)
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if err != nil {
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return false, err
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}
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return false, objectSDK.NewSplitInfoError(splitInfo)
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}
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// if parent bucket is empty, then check if object exists in typed buckets
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return firstIrregularObjectType(tx, cnr, objKey) != objectSDK.TypeRegular, nil
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}
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// inGraveyard returns:
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// * 0 if object is not marked for deletion;
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// * 1 if object with GC mark;
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// * 2 if object is covered with tombstone.
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func inGraveyard(tx *bbolt.Tx, addr oid.Address) uint8 {
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graveyard := tx.Bucket(graveyardBucketName)
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if graveyard == nil {
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// incorrect metabase state, does not make
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// sense to check garbage bucket
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return 0
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}
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val := graveyard.Get(addressKey(addr))
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if val == nil {
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garbageBCK := tx.Bucket(garbageBucketName)
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if garbageBCK == nil {
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// incorrect node state
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return 0
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}
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val = garbageBCK.Get(addressKey(addr))
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if val != nil {
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// object has been marked with GC
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return 1
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}
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// neither in the graveyard
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// nor was marked with GC mark
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return 0
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}
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// object in the graveyard
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return 2
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}
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// inBucket checks if key <key> is present in bucket <name>.
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func inBucket(tx *bbolt.Tx, name, key []byte) bool {
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bkt := tx.Bucket(name)
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if bkt == nil {
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return false
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}
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// using `get` as `exists`: https://github.com/boltdb/bolt/issues/321
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val := bkt.Get(key)
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return len(val) != 0
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}
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// getSplitInfo returns SplitInfo structure from root index. Returns error
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// if there is no `key` record in root index.
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func getSplitInfo(tx *bbolt.Tx, cnr cid.ID, key []byte) (*objectSDK.SplitInfo, error) {
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rawSplitInfo := getFromBucket(tx, rootBucketName(cnr), key)
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if len(rawSplitInfo) == 0 {
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return nil, ErrLackSplitInfo
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}
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splitInfo := objectSDK.NewSplitInfo()
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err := splitInfo.Unmarshal(rawSplitInfo)
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if err != nil {
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return nil, fmt.Errorf("can't unmarshal split info from root index: %w", err)
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}
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return splitInfo, nil
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}
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