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330 lines
6.5 KiB
330 lines
6.5 KiB
package db
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import (
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"encoding/binary"
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"fmt"
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"regexp"
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"strconv"
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dbm "github.com/tendermint/tm-db"
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tmsync "github.com/tendermint/tendermint/libs/sync"
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"github.com/tendermint/tendermint/light/store"
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tmproto "github.com/tendermint/tendermint/proto/tendermint/types"
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"github.com/tendermint/tendermint/types"
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)
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var (
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sizeKey = []byte("size")
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)
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type dbs struct {
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db dbm.DB
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prefix string
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mtx tmsync.RWMutex
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size uint16
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}
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// New returns a Store that wraps any DB (with an optional prefix in case you
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// want to use one DB with many light clients).
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func New(db dbm.DB, prefix string) store.Store {
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size := uint16(0)
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bz, err := db.Get(sizeKey)
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if err == nil && len(bz) > 0 {
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size = unmarshalSize(bz)
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}
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return &dbs{db: db, prefix: prefix, size: size}
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}
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// SaveLightBlock persists LightBlock to the db.
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//
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// Safe for concurrent use by multiple goroutines.
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func (s *dbs) SaveLightBlock(lb *types.LightBlock) error {
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if lb.Height <= 0 {
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panic("negative or zero height")
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}
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lbpb, err := lb.ToProto()
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if err != nil {
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return fmt.Errorf("unable to convert light block to protobuf: %w", err)
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}
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lbBz, err := lbpb.Marshal()
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if err != nil {
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return fmt.Errorf("marshalling LightBlock: %w", err)
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}
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s.mtx.Lock()
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defer s.mtx.Unlock()
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b := s.db.NewBatch()
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defer b.Close()
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if err = b.Set(s.lbKey(lb.Height), lbBz); err != nil {
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return err
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}
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if err = b.Set(sizeKey, marshalSize(s.size+1)); err != nil {
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return err
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}
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if err = b.WriteSync(); err != nil {
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return err
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}
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s.size++
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return nil
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}
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// DeleteLightBlockAndValidatorSet deletes the LightBlock from
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// the db.
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//
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// Safe for concurrent use by multiple goroutines.
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func (s *dbs) DeleteLightBlock(height int64) error {
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if height <= 0 {
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panic("negative or zero height")
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}
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s.mtx.Lock()
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defer s.mtx.Unlock()
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b := s.db.NewBatch()
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defer b.Close()
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if err := b.Delete(s.lbKey(height)); err != nil {
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return err
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}
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if err := b.Set(sizeKey, marshalSize(s.size-1)); err != nil {
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return err
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}
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if err := b.WriteSync(); err != nil {
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return err
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}
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s.size--
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return nil
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}
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// LightBlock retrieves the LightBlock at the given height.
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//
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// Safe for concurrent use by multiple goroutines.
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func (s *dbs) LightBlock(height int64) (*types.LightBlock, error) {
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if height <= 0 {
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panic("negative or zero height")
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}
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bz, err := s.db.Get(s.lbKey(height))
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if err != nil {
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panic(err)
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}
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if len(bz) == 0 {
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return nil, store.ErrLightBlockNotFound
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}
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var lbpb tmproto.LightBlock
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err = lbpb.Unmarshal(bz)
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if err != nil {
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return nil, fmt.Errorf("unmarshal error: %w", err)
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}
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lightBlock, err := types.LightBlockFromProto(&lbpb)
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if err != nil {
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return nil, fmt.Errorf("proto conversion error: %w", err)
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}
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return lightBlock, err
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}
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// LastLightBlockHeight returns the last LightBlock height stored.
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//
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// Safe for concurrent use by multiple goroutines.
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func (s *dbs) LastLightBlockHeight() (int64, error) {
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itr, err := s.db.ReverseIterator(
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s.lbKey(1),
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append(s.lbKey(1<<63-1), byte(0x00)),
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)
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if err != nil {
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panic(err)
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}
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defer itr.Close()
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for itr.Valid() {
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key := itr.Key()
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_, height, ok := parseLbKey(key)
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if ok {
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return height, nil
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}
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itr.Next()
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}
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return -1, itr.Error()
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}
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// FirstLightBlockHeight returns the first LightBlock height stored.
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//
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// Safe for concurrent use by multiple goroutines.
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func (s *dbs) FirstLightBlockHeight() (int64, error) {
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itr, err := s.db.Iterator(
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s.lbKey(1),
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append(s.lbKey(1<<63-1), byte(0x00)),
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)
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if err != nil {
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panic(err)
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}
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defer itr.Close()
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for itr.Valid() {
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key := itr.Key()
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_, height, ok := parseLbKey(key)
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if ok {
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return height, nil
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}
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itr.Next()
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}
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return -1, itr.Error()
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}
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// LightBlockBefore iterates over light blocks until it finds a block before
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// the given height. It returns ErrLightBlockNotFound if no such block exists.
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//
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// Safe for concurrent use by multiple goroutines.
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func (s *dbs) LightBlockBefore(height int64) (*types.LightBlock, error) {
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if height <= 0 {
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panic("negative or zero height")
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}
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itr, err := s.db.ReverseIterator(
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s.lbKey(1),
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s.lbKey(height),
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)
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if err != nil {
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panic(err)
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}
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defer itr.Close()
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for itr.Valid() {
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key := itr.Key()
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_, existingHeight, ok := parseLbKey(key)
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if ok {
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return s.LightBlock(existingHeight)
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}
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itr.Next()
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}
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if err = itr.Error(); err != nil {
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return nil, err
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}
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return nil, store.ErrLightBlockNotFound
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}
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// Prune prunes header & validator set pairs until there are only size pairs
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// left.
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//
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// Safe for concurrent use by multiple goroutines.
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func (s *dbs) Prune(size uint16) error {
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// 1) Check how many we need to prune.
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s.mtx.RLock()
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sSize := s.size
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s.mtx.RUnlock()
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if sSize <= size { // nothing to prune
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return nil
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}
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numToPrune := sSize - size
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// 2) Iterate over headers and perform a batch operation.
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itr, err := s.db.Iterator(
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s.lbKey(1),
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append(s.lbKey(1<<63-1), byte(0x00)),
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)
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if err != nil {
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return err
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}
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defer itr.Close()
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b := s.db.NewBatch()
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defer b.Close()
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pruned := 0
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for itr.Valid() && numToPrune > 0 {
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key := itr.Key()
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_, height, ok := parseLbKey(key)
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if ok {
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if err = b.Delete(s.lbKey(height)); err != nil {
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return err
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}
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}
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itr.Next()
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numToPrune--
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pruned++
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}
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if err = itr.Error(); err != nil {
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return err
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}
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err = b.WriteSync()
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if err != nil {
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return err
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}
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// 3) Update size.
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s.mtx.Lock()
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defer s.mtx.Unlock()
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s.size -= uint16(pruned)
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if wErr := s.db.SetSync(sizeKey, marshalSize(s.size)); wErr != nil {
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return fmt.Errorf("failed to persist size: %w", wErr)
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}
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return nil
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}
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// Size returns the number of header & validator set pairs.
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//
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// Safe for concurrent use by multiple goroutines.
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func (s *dbs) Size() uint16 {
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s.mtx.RLock()
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defer s.mtx.RUnlock()
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return s.size
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}
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func (s *dbs) lbKey(height int64) []byte {
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return []byte(fmt.Sprintf("lb/%s/%020d", s.prefix, height))
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}
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var keyPattern = regexp.MustCompile(`^(lb)/([^/]*)/([0-9]+)$`)
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func parseKey(key []byte) (part string, prefix string, height int64, ok bool) {
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submatch := keyPattern.FindSubmatch(key)
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if submatch == nil {
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return "", "", 0, false
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}
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part = string(submatch[1])
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prefix = string(submatch[2])
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height, err := strconv.ParseInt(string(submatch[3]), 10, 64)
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if err != nil {
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return "", "", 0, false
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}
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ok = true // good!
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return
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}
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func parseLbKey(key []byte) (prefix string, height int64, ok bool) {
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var part string
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part, prefix, height, ok = parseKey(key)
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if part != "lb" {
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return "", 0, false
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}
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return
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}
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func marshalSize(size uint16) []byte {
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bs := make([]byte, 2)
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binary.LittleEndian.PutUint16(bs, size)
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return bs
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}
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func unmarshalSize(bz []byte) uint16 {
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return binary.LittleEndian.Uint16(bz)
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}
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