262 lines
7.8 KiB
Go
262 lines
7.8 KiB
Go
package meta
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import (
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"bytes"
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"crypto/sha256"
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"errors"
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cid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id"
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objectSDK "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
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oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
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"go.etcd.io/bbolt"
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)
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var (
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// graveyardBucketName stores rows with the objects that have been
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// covered with Tombstone objects. That objects should not be returned
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// from the node and should not be accepted by the node from other
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// nodes.
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graveyardBucketName = []byte{graveyardPrefix}
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// garbageBucketName stores rows with the objects that should be physically
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// deleted by the node (Garbage Collector routine).
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garbageBucketName = []byte{garbagePrefix}
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toMoveItBucketName = []byte{toMoveItPrefix}
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containerVolumeBucketName = []byte{containerVolumePrefix}
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containerCounterBucketName = []byte{containerCountersPrefix}
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zeroValue = []byte{0xFF}
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errInvalidLength = errors.New("invalid length")
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)
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// Prefix bytes for database keys. All ids and addresses are encoded in binary
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// unless specified otherwise.
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//
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//nolint:godot
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const (
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// graveyardPrefix is used for the graveyard bucket.
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// Key: object address
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// Value: tombstone address
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graveyardPrefix = iota
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// garbagePrefix is used for the garbage bucket.
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// Key: object address
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// Value: dummy value
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garbagePrefix
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// toMoveItPrefix is used for bucket containing IDs of objects that are candidates for moving
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// to another shard.
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toMoveItPrefix
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// containerVolumePrefix is used for storing container size estimations.
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// Key: container ID
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// Value: container size in bytes as little-endian uint64
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containerVolumePrefix
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// lockedPrefix is used for storing locked objects information.
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// Key: container ID
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// Value: bucket mapping objects locked to the list of corresponding LOCK objects.
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lockedPrefix
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// shardInfoPrefix is used for storing shard ID. All keys are custom and are not connected to the container.
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shardInfoPrefix
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// ======================
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// Unique index buckets.
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// ======================
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// primaryPrefix is used for prefixing buckets containing objects of REGULAR type.
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// Key: object ID
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// Value: marshalled object
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primaryPrefix
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// lockersPrefix is used for prefixing buckets containing objects of LOCK type.
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// Key: object ID
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// Value: marshalled object
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lockersPrefix
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// _ is unused. Previous usage was for prefixing buckets containing objects of STORAGEGROUP type.
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// Key: object ID
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// Value: marshaled object
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_
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// tombstonePrefix is used for prefixing buckets containing objects of TOMBSTONE type.
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// Key: object ID
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// Value: marshaled object
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tombstonePrefix
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// smallPrefix is used for prefixing buckets mapping objects to the blobovniczas they are stored in.
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// Key: object ID
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// Value: blobovnicza ID
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smallPrefix
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// rootPrefix is used for prefixing buckets mapping parent object to the split info.
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// Key: object ID
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// Value: split info
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rootPrefix
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// ====================
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// FKBT index buckets.
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// ====================
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// ownerPrefix is used for prefixing FKBT index buckets mapping owner to object IDs.
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// Key: owner ID
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// Value: bucket containing object IDs as keys
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ownerPrefix
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// userAttributePrefix is used for prefixing FKBT index buckets containing objects.
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// Key: attribute value
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// Value: bucket containing object IDs as keys
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userAttributePrefix
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// ====================
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// List index buckets.
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// ====================
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// payloadHashPrefix is used for prefixing List index buckets mapping payload hash to a list of object IDs.
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// Key: payload hash
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// Value: list of object IDs
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payloadHashPrefix
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// parentPrefix is used for prefixing List index buckets mapping parent ID to a list of children IDs.
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// Key: parent ID
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// Value: list of object IDs
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parentPrefix
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// splitPrefix is used for prefixing List index buckets mapping split ID to a list of object IDs.
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// Key: split ID
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// Value: list of object IDs
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splitPrefix
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// containerCountersPrefix is used for storing container object counters.
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// Key: container ID + type
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// Value: container size in bytes as little-endian uint64
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containerCountersPrefix
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)
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const (
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cidSize = sha256.Size
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bucketKeySize = 1 + cidSize
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objectKeySize = sha256.Size
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addressKeySize = cidSize + objectKeySize
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)
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func bucketName(cnr cid.ID, prefix byte, key []byte) []byte {
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key[0] = prefix
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cnr.Encode(key[1:])
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return key[:bucketKeySize]
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}
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// primaryBucketName returns <CID>.
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func primaryBucketName(cnr cid.ID, key []byte) []byte {
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return bucketName(cnr, primaryPrefix, key)
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}
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// tombstoneBucketName returns <CID>_TS.
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func tombstoneBucketName(cnr cid.ID, key []byte) []byte {
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return bucketName(cnr, tombstonePrefix, key)
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}
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// smallBucketName returns <CID>_small.
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func smallBucketName(cnr cid.ID, key []byte) []byte {
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return bucketName(cnr, smallPrefix, key)
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}
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// attributeBucketName returns <CID>_attr_<attributeKey>.
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func attributeBucketName(cnr cid.ID, attributeKey string, key []byte) []byte {
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key[0] = userAttributePrefix
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cnr.Encode(key[1:])
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return append(key[:bucketKeySize], attributeKey...)
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}
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// returns <CID> from attributeBucketName result, nil otherwise.
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func cidFromAttributeBucket(val []byte, attributeKey string) []byte {
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if len(val) < bucketKeySize || val[0] != userAttributePrefix || !bytes.Equal(val[bucketKeySize:], []byte(attributeKey)) {
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return nil
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}
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return val[1:bucketKeySize]
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}
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// payloadHashBucketName returns <CID>_payloadhash.
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func payloadHashBucketName(cnr cid.ID, key []byte) []byte {
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return bucketName(cnr, payloadHashPrefix, key)
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}
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// rootBucketName returns <CID>_root.
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func rootBucketName(cnr cid.ID, key []byte) []byte {
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return bucketName(cnr, rootPrefix, key)
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}
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// ownerBucketName returns <CID>_ownerid.
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func ownerBucketName(cnr cid.ID, key []byte) []byte {
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return bucketName(cnr, ownerPrefix, key)
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}
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// parentBucketName returns <CID>_parent.
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func parentBucketName(cnr cid.ID, key []byte) []byte {
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return bucketName(cnr, parentPrefix, key)
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}
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// splitBucketName returns <CID>_splitid.
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func splitBucketName(cnr cid.ID, key []byte) []byte {
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return bucketName(cnr, splitPrefix, key)
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}
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// addressKey returns key for K-V tables when key is a whole address.
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func addressKey(addr oid.Address, key []byte) []byte {
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addr.Container().Encode(key)
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addr.Object().Encode(key[cidSize:])
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return key[:addressKeySize]
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}
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// parses object address formed by addressKey.
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func decodeAddressFromKey(dst *oid.Address, k []byte) error {
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if len(k) != addressKeySize {
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return errInvalidLength
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}
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var cnr cid.ID
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if err := cnr.Decode(k[:cidSize]); err != nil {
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return err
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}
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var obj oid.ID
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if err := obj.Decode(k[cidSize:]); err != nil {
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return err
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}
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dst.SetObject(obj)
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dst.SetContainer(cnr)
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return nil
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}
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// objectKey returns key for K-V tables when key is an object id.
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func objectKey(obj oid.ID, key []byte) []byte {
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obj.Encode(key)
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return key[:objectKeySize]
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}
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// if meets irregular object container in objs - returns its type, otherwise returns object.TypeRegular.
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//
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// firstIrregularObjectType(tx, cnr, obj) usage allows getting object type.
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func firstIrregularObjectType(tx *bbolt.Tx, idCnr cid.ID, objs ...[]byte) objectSDK.Type {
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if len(objs) == 0 {
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panic("empty object list in firstIrregularObjectType")
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}
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var keys [2][1 + cidSize]byte
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irregularTypeBuckets := [...]struct {
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typ objectSDK.Type
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name []byte
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}{
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{objectSDK.TypeTombstone, tombstoneBucketName(idCnr, keys[0][:])},
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{objectSDK.TypeLock, bucketNameLockers(idCnr, keys[1][:])},
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}
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for i := range objs {
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for j := range irregularTypeBuckets {
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if inBucket(tx, irregularTypeBuckets[j].name, objs[i]) {
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return irregularTypeBuckets[j].typ
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}
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}
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}
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return objectSDK.TypeRegular
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}
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// return true if provided object is of LOCK type.
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func isLockObject(tx *bbolt.Tx, idCnr cid.ID, obj oid.ID) bool {
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return inBucket(tx,
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bucketNameLockers(idCnr, make([]byte, bucketKeySize)),
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objectKey(obj, make([]byte, objectKeySize)))
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}
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