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465 lines
14 KiB
465 lines
14 KiB
package evidence
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import (
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"fmt"
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"sync"
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"time"
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dbm "github.com/tendermint/tm-db"
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clist "github.com/tendermint/tendermint/libs/clist"
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"github.com/tendermint/tendermint/libs/log"
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sm "github.com/tendermint/tendermint/state"
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"github.com/tendermint/tendermint/store"
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"github.com/tendermint/tendermint/types"
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)
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const (
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baseKeyCommitted = byte(0x00) // committed evidence
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baseKeyPending = byte(0x01) // pending evidence
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)
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// Pool maintains a pool of valid evidence to be broadcasted and committed
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type Pool struct {
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logger log.Logger
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evidenceStore dbm.DB
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evidenceList *clist.CList // concurrent linked-list of evidence
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// needed to load validators to verify evidence
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stateDB dbm.DB
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// needed to load headers to verify evidence
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blockStore *store.BlockStore
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mtx sync.Mutex
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// latest state
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state sm.State
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// a map of active validators and respective last heights validator is active
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// if it was in validator set after EvidenceParams.MaxAgeNumBlocks or
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// currently is (ie. [MaxAgeNumBlocks, CurrentHeight])
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// In simple words, it means it's still bonded -> therefore slashable.
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valToLastHeight valToLastHeightMap
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}
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// Validator.Address -> Last height it was in validator set
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type valToLastHeightMap map[string]int64
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func NewPool(stateDB, evidenceDB dbm.DB, blockStore *store.BlockStore) (*Pool, error) {
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var (
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state = sm.LoadState(stateDB)
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)
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valToLastHeight, err := buildValToLastHeightMap(state, stateDB, blockStore)
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if err != nil {
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return nil, err
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}
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pool := &Pool{
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stateDB: stateDB,
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blockStore: blockStore,
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state: state,
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logger: log.NewNopLogger(),
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evidenceStore: evidenceDB,
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evidenceList: clist.New(),
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valToLastHeight: valToLastHeight,
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}
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// if pending evidence already in db, in event of prior failure, then load it back to the evidenceList
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evList, err := pool.listEvidence(baseKeyPending, -1)
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if err != nil {
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return nil, err
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}
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for _, ev := range evList {
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if pool.IsExpired(ev) {
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pool.removePendingEvidence(ev)
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continue
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}
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pool.evidenceList.PushBack(ev)
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}
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return pool, nil
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}
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// PendingEvidence is used primarily as part of block proposal and returns up to maxNum of uncommitted evidence.
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// If maxNum is -1, all evidence is returned. Pending evidence is prioritised based on time.
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func (evpool *Pool) PendingEvidence(maxNum uint32) []types.Evidence {
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evidence, err := evpool.listEvidence(baseKeyPending, int64(maxNum))
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if err != nil {
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evpool.logger.Error("Unable to retrieve pending evidence", "err", err)
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}
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return evidence
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}
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func (evpool *Pool) AllPendingEvidence() []types.Evidence {
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evidence, err := evpool.listEvidence(baseKeyPending, -1)
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if err != nil {
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evpool.logger.Error("Unable to retrieve pending evidence", "err", err)
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}
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return evidence
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}
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// Update uses the latest block & state to update its copy of the state,
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// validator to last height map and calls MarkEvidenceAsCommitted.
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func (evpool *Pool) Update(block *types.Block, state sm.State) {
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// sanity check
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if state.LastBlockHeight != block.Height {
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panic(
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fmt.Sprintf("Failed EvidencePool.Update sanity check: got state.Height=%d with block.Height=%d",
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state.LastBlockHeight,
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block.Height,
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),
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)
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}
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// remove evidence from pending and mark committed
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evpool.MarkEvidenceAsCommitted(block.Height, block.Time, block.Evidence.Evidence)
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// update the state
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evpool.mtx.Lock()
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defer evpool.mtx.Unlock()
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evpool.state = state
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evpool.updateValToLastHeight(block.Height, state)
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}
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// AddEvidence checks the evidence is valid and adds it to the pool. If
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// evidence is composite (ConflictingHeadersEvidence), it will be broken up
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// into smaller pieces.
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func (evpool *Pool) AddEvidence(evidence types.Evidence) error {
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var (
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state = evpool.State()
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evList = []types.Evidence{evidence}
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)
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valSet, err := sm.LoadValidators(evpool.stateDB, evidence.Height())
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if err != nil {
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return fmt.Errorf("can't load validators at height #%d: %w", evidence.Height(), err)
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}
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// Break composite evidence into smaller pieces.
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if ce, ok := evidence.(types.CompositeEvidence); ok {
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evpool.logger.Info("Breaking up composite evidence", "ev", evidence)
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blockMeta := evpool.blockStore.LoadBlockMeta(evidence.Height())
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if blockMeta == nil {
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return fmt.Errorf("don't have block meta at height #%d", evidence.Height())
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}
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if err := ce.VerifyComposite(&blockMeta.Header, valSet); err != nil {
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return err
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}
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// XXX: Copy here since this should be a rare case.
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evpool.mtx.Lock()
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valToLastHeightCopy := make(valToLastHeightMap, len(evpool.valToLastHeight))
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for k, v := range evpool.valToLastHeight {
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valToLastHeightCopy[k] = v
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}
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evpool.mtx.Unlock()
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evList = ce.Split(&blockMeta.Header, valSet, valToLastHeightCopy)
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}
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for _, ev := range evList {
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if evpool.Has(ev) {
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continue
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}
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// For lunatic validator evidence, a header needs to be fetched.
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var header *types.Header
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if _, ok := ev.(*types.LunaticValidatorEvidence); ok {
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blockMeta := evpool.blockStore.LoadBlockMeta(ev.Height())
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if blockMeta == nil {
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return fmt.Errorf("don't have block meta at height #%d", ev.Height())
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}
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header = &blockMeta.Header
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}
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// 1) Verify against state.
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if err := sm.VerifyEvidence(evpool.stateDB, state, ev, header); err != nil {
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return fmt.Errorf("failed to verify %v: %w", ev, err)
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}
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// 2) Save to store.
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if err := evpool.addPendingEvidence(ev); err != nil {
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return fmt.Errorf("database error: %v", err)
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}
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// 3) Add evidence to clist.
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evpool.evidenceList.PushBack(ev)
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evpool.logger.Info("Verified new evidence of byzantine behaviour", "evidence", ev)
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}
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return nil
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}
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// MarkEvidenceAsCommitted marks all the evidence as committed and removes it
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// from the queue.
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func (evpool *Pool) MarkEvidenceAsCommitted(height int64, lastBlockTime time.Time, evidence []types.Evidence) {
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// make a map of committed evidence to remove from the clist
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blockEvidenceMap := make(map[string]struct{})
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for _, ev := range evidence {
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// As the evidence is stored in the block store we only need to record the height that it was saved at.
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key := keyCommitted(ev)
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evBytes := cdc.MustMarshalBinaryBare(height)
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if err := evpool.evidenceStore.Set(key, evBytes); err != nil {
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evpool.logger.Error("Unable to add committed evidence", "err", err)
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// if we can't move evidence to committed then don't remove the evidence from pending
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continue
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}
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// if pending, remove from that bucket, remember not all evidence has been seen before
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if evpool.IsPending(ev) {
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evpool.removePendingEvidence(ev)
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blockEvidenceMap[evMapKey(ev)] = struct{}{}
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}
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}
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// remove committed evidence from the clist
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if len(blockEvidenceMap) != 0 {
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evidenceParams := evpool.State().ConsensusParams.Evidence
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evpool.removeEvidenceFromList(height, lastBlockTime, evidenceParams, blockEvidenceMap)
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}
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}
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// Has checks whether the evidence exists either pending or already committed
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func (evpool *Pool) Has(evidence types.Evidence) bool {
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return evpool.IsPending(evidence) || evpool.IsCommitted(evidence)
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}
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// IsExpired checks whether evidence is past the maximum age where it can be used
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func (evpool *Pool) IsExpired(evidence types.Evidence) bool {
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var (
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params = evpool.State().ConsensusParams.Evidence
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ageDuration = evpool.State().LastBlockTime.Sub(evidence.Time())
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ageNumBlocks = evpool.State().LastBlockHeight - evidence.Height()
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)
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return ageNumBlocks > params.MaxAgeNumBlocks &&
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ageDuration > params.MaxAgeDuration
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}
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// IsCommitted returns true if we have already seen this exact evidence and it is already marked as committed.
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func (evpool *Pool) IsCommitted(evidence types.Evidence) bool {
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key := keyCommitted(evidence)
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ok, err := evpool.evidenceStore.Has(key)
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if err != nil {
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evpool.logger.Error("Unable to find committed evidence", "err", err)
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}
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return ok
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}
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// Checks whether the evidence is already pending. DB errors are passed to the logger.
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func (evpool *Pool) IsPending(evidence types.Evidence) bool {
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key := keyPending(evidence)
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ok, err := evpool.evidenceStore.Has(key)
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if err != nil {
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evpool.logger.Error("Unable to find pending evidence", "err", err)
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}
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return ok
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}
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// EvidenceFront goes to the first evidence in the clist
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func (evpool *Pool) EvidenceFront() *clist.CElement {
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return evpool.evidenceList.Front()
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}
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// EvidenceWaitChan is a channel that closes once the first evidence in the list is there. i.e Front is not nil
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func (evpool *Pool) EvidenceWaitChan() <-chan struct{} {
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return evpool.evidenceList.WaitChan()
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}
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// SetLogger sets the Logger.
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func (evpool *Pool) SetLogger(l log.Logger) {
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evpool.logger = l
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}
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// ValidatorLastHeight returns the last height of the validator w/ the
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// given address. 0 - if address never was a validator or was such a
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// long time ago (> ConsensusParams.Evidence.MaxAgeDuration && >
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// ConsensusParams.Evidence.MaxAgeNumBlocks).
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func (evpool *Pool) ValidatorLastHeight(address []byte) int64 {
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evpool.mtx.Lock()
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defer evpool.mtx.Unlock()
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h, ok := evpool.valToLastHeight[string(address)]
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if !ok {
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return 0
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}
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return h
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}
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// State returns the current state of the evpool.
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func (evpool *Pool) State() sm.State {
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evpool.mtx.Lock()
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defer evpool.mtx.Unlock()
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return evpool.state
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}
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func (evpool *Pool) addPendingEvidence(evidence types.Evidence) error {
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evBytes := cdc.MustMarshalBinaryBare(evidence)
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key := keyPending(evidence)
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return evpool.evidenceStore.Set(key, evBytes)
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}
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func (evpool *Pool) removePendingEvidence(evidence types.Evidence) {
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key := keyPending(evidence)
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if err := evpool.evidenceStore.Delete(key); err != nil {
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evpool.logger.Error("Unable to delete pending evidence", "err", err)
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}
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}
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// listEvidence lists up to maxNum pieces of evidence for the given prefix key.
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// If maxNum is -1, there's no cap on the size of returned evidence.
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func (evpool *Pool) listEvidence(prefixKey byte, maxNum int64) ([]types.Evidence, error) {
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var count int64
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var evidence []types.Evidence
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iter, err := dbm.IteratePrefix(evpool.evidenceStore, []byte{prefixKey})
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if err != nil {
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return nil, fmt.Errorf("database error: %v", err)
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}
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defer iter.Close()
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for ; iter.Valid(); iter.Next() {
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val := iter.Value()
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if count == maxNum {
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return evidence, nil
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}
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count++
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var ev types.Evidence
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err := cdc.UnmarshalBinaryBare(val, &ev)
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if err != nil {
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return nil, err
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}
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evidence = append(evidence, ev)
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}
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return evidence, nil
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}
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func (evpool *Pool) removeEvidenceFromList(
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height int64,
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lastBlockTime time.Time,
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params types.EvidenceParams,
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blockEvidenceMap map[string]struct{}) {
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for e := evpool.evidenceList.Front(); e != nil; e = e.Next() {
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var (
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ev = e.Value.(types.Evidence)
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ageDuration = lastBlockTime.Sub(ev.Time())
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ageNumBlocks = height - ev.Height()
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)
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// Remove the evidence if it's already in a block or if it's now too old.
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if _, ok := blockEvidenceMap[evMapKey(ev)]; ok ||
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(ageDuration > params.MaxAgeDuration && ageNumBlocks > params.MaxAgeNumBlocks) {
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// remove from clist
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evpool.evidenceList.Remove(e)
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e.DetachPrev()
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}
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}
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}
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func evMapKey(ev types.Evidence) string {
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return string(ev.Hash())
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}
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func (evpool *Pool) updateValToLastHeight(blockHeight int64, state sm.State) {
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// Update current validators & add new ones.
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for _, val := range state.Validators.Validators {
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evpool.valToLastHeight[string(val.Address)] = blockHeight
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}
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// Remove validators outside of MaxAgeNumBlocks & MaxAgeDuration.
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removeHeight := blockHeight - state.ConsensusParams.Evidence.MaxAgeNumBlocks
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if removeHeight >= 1 {
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for val, height := range evpool.valToLastHeight {
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if height <= removeHeight {
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delete(evpool.valToLastHeight, val)
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}
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}
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}
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}
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func buildValToLastHeightMap(state sm.State, stateDB dbm.DB, blockStore *store.BlockStore) (valToLastHeightMap, error) {
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var (
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valToLastHeight = make(map[string]int64)
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params = state.ConsensusParams.Evidence
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numBlocks = int64(0)
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minAgeTime = time.Now().Add(-params.MaxAgeDuration)
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height = state.LastBlockHeight
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)
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if height == 0 {
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return valToLastHeight, nil
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}
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meta := blockStore.LoadBlockMeta(height)
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if meta == nil {
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return nil, fmt.Errorf("block meta for height %d not found", height)
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}
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blockTime := meta.Header.Time
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// From state.LastBlockHeight, build a map of "active" validators until
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// MaxAgeNumBlocks is passed and block time is less than now() -
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// MaxAgeDuration.
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for height >= 1 && (numBlocks <= params.MaxAgeNumBlocks || !blockTime.Before(minAgeTime)) {
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valSet, err := sm.LoadValidators(stateDB, height)
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if err != nil {
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// last stored height -> return
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if _, ok := err.(sm.ErrNoValSetForHeight); ok {
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return valToLastHeight, nil
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}
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return nil, fmt.Errorf("validator set for height %d not found", height)
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}
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for _, val := range valSet.Validators {
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key := string(val.Address)
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if _, ok := valToLastHeight[key]; !ok {
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valToLastHeight[key] = height
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}
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}
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height--
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if height > 0 {
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// NOTE: we assume here blockStore and state.Validators are in sync. I.e if
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// block N is stored, then validators for height N are also stored in
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// state.
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meta := blockStore.LoadBlockMeta(height)
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if meta == nil {
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return nil, fmt.Errorf("block meta for height %d not found", height)
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}
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blockTime = meta.Header.Time
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}
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numBlocks++
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}
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return valToLastHeight, nil
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}
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// big endian padded hex
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func bE(h int64) string {
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return fmt.Sprintf("%0.16X", h)
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}
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func keyCommitted(evidence types.Evidence) []byte {
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return append([]byte{baseKeyCommitted}, keySuffix(evidence)...)
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}
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func keyPending(evidence types.Evidence) []byte {
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return append([]byte{baseKeyPending}, keySuffix(evidence)...)
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}
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func keySuffix(evidence types.Evidence) []byte {
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return []byte(fmt.Sprintf("%s/%X", bE(evidence.Height()), evidence.Hash()))
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}
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// ErrInvalidEvidence returns when evidence failed to validate
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type ErrInvalidEvidence struct {
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Reason error
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}
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func (e ErrInvalidEvidence) Error() string {
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return fmt.Sprintf("evidence is not valid: %v ", e.Reason)
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}
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