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529 lines
16 KiB
529 lines
16 KiB
package evidence
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import (
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"bytes"
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"errors"
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"fmt"
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"sort"
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"sync"
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"sync/atomic"
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"time"
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"github.com/gogo/protobuf/proto"
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gogotypes "github.com/gogo/protobuf/types"
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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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tmproto "github.com/tendermint/tendermint/proto/tendermint/types"
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sm "github.com/tendermint/tendermint/state"
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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)
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baseKeyPending = byte(0x01)
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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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evidenceSize uint32 // amount of pending evidence
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// needed to load validators to verify evidence
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stateDB sm.Store
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// needed to load headers and commits to verify evidence
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blockStore 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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pruningHeight int64
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pruningTime time.Time
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}
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// NewPool creates an evidence pool. If using an existing evidence store,
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// it will add all pending evidence to the concurrent list.
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func NewPool(evidenceDB dbm.DB, stateDB sm.Store, blockStore BlockStore) (*Pool, error) {
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state, err := stateDB.Load()
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if err != nil {
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return nil, fmt.Errorf("cannot load state: %w", 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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}
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// if pending evidence already in db, in event of prior failure, then check for expiration,
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// update the size and load it back to the evidenceList
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pool.pruningHeight, pool.pruningTime = pool.removeExpiredPendingEvidence()
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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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atomic.StoreUint32(&pool.evidenceSize, uint32(len(evList)))
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for _, ev := range evList {
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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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func (evpool *Pool) PendingEvidence(maxBytes int64) ([]types.Evidence, int64) {
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if evpool.Size() == 0 {
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return []types.Evidence{}, 0
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}
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evidence, size, err := evpool.listEvidence(baseKeyPending, maxBytes)
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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, size
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}
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// Update pulls the latest state to be used for expiration and evidence params and then prunes all expired evidence
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func (evpool *Pool) Update(state sm.State, ev types.EvidenceList) {
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// sanity check
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if state.LastBlockHeight <= evpool.state.LastBlockHeight {
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panic(fmt.Sprintf(
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"Failed EvidencePool.Update new state height is less than or equal to previous state height: %d <= %d",
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state.LastBlockHeight,
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evpool.state.LastBlockHeight,
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))
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}
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evpool.logger.Info("Updating evidence pool", "last_block_height", state.LastBlockHeight,
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"last_block_time", state.LastBlockTime)
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// update the state
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evpool.updateState(state)
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evpool.markEvidenceAsCommitted(ev)
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// prune pending evidence when it has expired. This also updates when the next evidence will expire
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if evpool.Size() > 0 && state.LastBlockHeight > evpool.pruningHeight &&
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state.LastBlockTime.After(evpool.pruningTime) {
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evpool.pruningHeight, evpool.pruningTime = evpool.removeExpiredPendingEvidence()
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}
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}
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// AddEvidence checks the evidence is valid and adds it to the pool.
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func (evpool *Pool) AddEvidence(ev types.Evidence) error {
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evpool.logger.Debug("Attempting to add evidence", "ev", ev)
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// We have already verified this piece of evidence - no need to do it again
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if evpool.isPending(ev) {
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evpool.logger.Info("Evidence already pending, ignoring this one", "ev", ev)
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return nil
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}
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// check that the evidence isn't already committed
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if evpool.isCommitted(ev) {
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// this can happen if the peer that sent us the evidence is behind so we shouldn't
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// punish the peer.
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evpool.logger.Debug("Evidence was already committed, ignoring this one", "ev", ev)
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return nil
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}
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// 1) Verify against state.
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err := evpool.verify(ev)
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if err != nil {
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return types.NewErrInvalidEvidence(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("can't add evidence to pending list: %w", 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 behavior", "evidence", ev)
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return nil
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}
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// AddEvidenceFromConsensus should be exposed only to the consensus reactor so it can add evidence
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// to the pool directly without the need for verification.
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func (evpool *Pool) AddEvidenceFromConsensus(ev types.Evidence) error {
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// we already have this evidence, log this but don't return an error.
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if evpool.isPending(ev) {
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evpool.logger.Info("Evidence already pending, ignoring this one", "ev", ev)
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return nil
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}
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if err := evpool.addPendingEvidence(ev); err != nil {
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return fmt.Errorf("can't add evidence to pending list: %w", err)
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}
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// add evidence to be gossiped with peers
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evpool.evidenceList.PushBack(ev)
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evpool.logger.Info("Verified new evidence of byzantine behavior", "evidence", ev)
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return nil
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}
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// CheckEvidence takes an array of evidence from a block and verifies all the evidence there.
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// If it has already verified the evidence then it jumps to the next one. It ensures that no
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// evidence has already been committed or is being proposed twice. It also adds any
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// evidence that it doesn't currently have so that it can quickly form ABCI Evidence later.
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func (evpool *Pool) CheckEvidence(evList types.EvidenceList) error {
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hashes := make([][]byte, len(evList))
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for idx, ev := range evList {
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ok := evpool.fastCheck(ev)
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if !ok {
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// check that the evidence isn't already committed
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if evpool.isCommitted(ev) {
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return &types.ErrInvalidEvidence{Evidence: ev, Reason: errors.New("evidence was already committed")}
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}
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err := evpool.verify(ev)
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if err != nil {
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return &types.ErrInvalidEvidence{Evidence: ev, Reason: err}
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}
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if err := evpool.addPendingEvidence(ev); err != nil {
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// Something went wrong with adding the evidence but we already know it is valid
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// hence we log an error and continue
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evpool.logger.Error("Can't add evidence to pending list", "err", err, "ev", ev)
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}
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evpool.logger.Info("Verified new evidence of byzantine behavior", "evidence", ev)
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}
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// check for duplicate evidence. We cache hashes so we don't have to work them out again.
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hashes[idx] = ev.Hash()
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for i := idx - 1; i >= 0; i-- {
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if bytes.Equal(hashes[i], hashes[idx]) {
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return &types.ErrInvalidEvidence{Evidence: ev, Reason: errors.New("duplicate evidence")}
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}
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}
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}
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return nil
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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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// Size returns the number of evidence in the pool.
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func (evpool *Pool) Size() uint32 {
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return atomic.LoadUint32(&evpool.evidenceSize)
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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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//--------------------------------------------------------------------------
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// fastCheck leverages the fact that the evidence pool may have already verified the evidence to see if it can
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// quickly conclude that the evidence is already valid.
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func (evpool *Pool) fastCheck(ev types.Evidence) bool {
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if lcae, ok := ev.(*types.LightClientAttackEvidence); ok {
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key := keyPending(ev)
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evBytes, err := evpool.evidenceStore.Get(key)
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if evBytes == nil { // the evidence is not in the nodes pending list
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return false
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}
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if err != nil {
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evpool.logger.Error("Failed to load light client attack evidence", "err", err, "key(height/hash)", key)
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return false
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}
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var trustedPb tmproto.LightClientAttackEvidence
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err = trustedPb.Unmarshal(evBytes)
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if err != nil {
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evpool.logger.Error("Failed to convert light client attack evidence from bytes",
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"err", err, "key(height/hash)", key)
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return false
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}
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trustedEv, err := types.LightClientAttackEvidenceFromProto(&trustedPb)
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if err != nil {
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evpool.logger.Error("Failed to convert light client attack evidence from protobuf",
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"err", err, "key(height/hash)", key)
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return false
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}
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// ensure that all the byzantine validators that the evidence pool has match the byzantine validators
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// in this evidence
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if trustedEv.ByzantineValidators == nil && lcae.ByzantineValidators != nil {
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return false
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}
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if len(trustedEv.ByzantineValidators) != len(lcae.ByzantineValidators) {
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return false
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}
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byzValsCopy := make([]*types.Validator, len(lcae.ByzantineValidators))
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for i, v := range lcae.ByzantineValidators {
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byzValsCopy[i] = v.Copy()
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}
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// ensure that both validator arrays are in the same order
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sort.Sort(types.ValidatorsByVotingPower(byzValsCopy))
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for idx, val := range trustedEv.ByzantineValidators {
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if !bytes.Equal(byzValsCopy[idx].Address, val.Address) {
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return false
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}
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if byzValsCopy[idx].VotingPower != val.VotingPower {
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return false
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}
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}
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return true
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}
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// for all other evidence the evidence pool just checks if it is already in the pending db
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return evpool.isPending(ev)
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}
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// IsExpired checks whether evidence or a polc is expired by checking whether a height and time is older
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// than set by the evidence consensus parameters
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func (evpool *Pool) isExpired(height int64, time time.Time) bool {
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var (
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params = evpool.State().ConsensusParams.Evidence
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ageDuration = evpool.State().LastBlockTime.Sub(time)
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ageNumBlocks = evpool.State().LastBlockHeight - 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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// IsPending 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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func (evpool *Pool) addPendingEvidence(ev types.Evidence) error {
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evpb, err := types.EvidenceToProto(ev)
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if err != nil {
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return fmt.Errorf("unable to convert to proto, err: %w", err)
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}
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evBytes, err := evpb.Marshal()
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if err != nil {
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return fmt.Errorf("unable to marshal evidence: %w", err)
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}
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key := keyPending(ev)
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err = evpool.evidenceStore.Set(key, evBytes)
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if err != nil {
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return fmt.Errorf("can't persist evidence: %w", err)
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}
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atomic.AddUint32(&evpool.evidenceSize, 1)
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return nil
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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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} else {
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atomic.AddUint32(&evpool.evidenceSize, ^uint32(0))
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evpool.logger.Info("Deleted pending evidence", "evidence", evidence)
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}
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}
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// markEvidenceAsCommitted processes all the evidence in the block, marking it as
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// committed and removing it from the pending database.
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func (evpool *Pool) markEvidenceAsCommitted(evidence types.EvidenceList) {
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blockEvidenceMap := make(map[string]struct{}, len(evidence))
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for _, ev := range evidence {
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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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// Add evidence to the committed list. As the evidence is stored in the block store
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// we only need to record the height that it was saved at.
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key := keyCommitted(ev)
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h := gogotypes.Int64Value{Value: ev.Height()}
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evBytes, err := proto.Marshal(&h)
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if err != nil {
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evpool.logger.Error("failed to marshal committed evidence", "err", err, "key(height/hash)", key)
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continue
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}
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if err := evpool.evidenceStore.Set(key, evBytes); err != nil {
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evpool.logger.Error("Unable to save committed evidence", "err", err, "key(height/hash)", key)
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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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evpool.removeEvidenceFromList(blockEvidenceMap)
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}
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}
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// listEvidence retrieves lists evidence from oldest to newest within maxBytes.
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// If maxBytes is -1, there's no cap on the size of returned evidence.
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func (evpool *Pool) listEvidence(prefixKey byte, maxBytes int64) ([]types.Evidence, int64, error) {
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var (
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evSize int64
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totalSize int64
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evidence []types.Evidence
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evList tmproto.EvidenceList // used for calculating the bytes size
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)
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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, totalSize, 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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var evpb tmproto.Evidence
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err := evpb.Unmarshal(iter.Value())
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if err != nil {
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return evidence, totalSize, err
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}
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evList.Evidence = append(evList.Evidence, evpb)
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evSize = int64(evList.Size())
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if maxBytes != -1 && evSize > maxBytes {
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if err := iter.Error(); err != nil {
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return evidence, totalSize, err
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}
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return evidence, totalSize, nil
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}
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ev, err := types.EvidenceFromProto(&evpb)
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if err != nil {
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return nil, totalSize, err
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}
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totalSize = evSize
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evidence = append(evidence, ev)
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}
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if err := iter.Error(); err != nil {
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return evidence, totalSize, err
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}
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return evidence, totalSize, nil
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}
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func (evpool *Pool) removeExpiredPendingEvidence() (int64, time.Time) {
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iter, err := dbm.IteratePrefix(evpool.evidenceStore, []byte{baseKeyPending})
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if err != nil {
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evpool.logger.Error("Unable to iterate over pending evidence", "err", err)
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return evpool.State().LastBlockHeight, evpool.State().LastBlockTime
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}
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defer iter.Close()
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blockEvidenceMap := make(map[string]struct{})
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for ; iter.Valid(); iter.Next() {
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ev, err := bytesToEv(iter.Value())
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if err != nil {
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evpool.logger.Error("Error in transition evidence from protobuf", "err", err)
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continue
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}
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if !evpool.isExpired(ev.Height(), ev.Time()) {
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if len(blockEvidenceMap) != 0 {
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evpool.removeEvidenceFromList(blockEvidenceMap)
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}
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// return the height and time with which this evidence will have expired so we know when to prune next
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return ev.Height() + evpool.State().ConsensusParams.Evidence.MaxAgeNumBlocks + 1,
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ev.Time().Add(evpool.State().ConsensusParams.Evidence.MaxAgeDuration).Add(time.Second)
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}
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evpool.removePendingEvidence(ev)
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blockEvidenceMap[evMapKey(ev)] = struct{}{}
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}
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// We either have no pending evidence or all evidence has expired
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if len(blockEvidenceMap) != 0 {
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evpool.removeEvidenceFromList(blockEvidenceMap)
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}
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return evpool.State().LastBlockHeight, evpool.State().LastBlockTime
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}
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func (evpool *Pool) removeEvidenceFromList(
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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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// Remove from clist
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ev := e.Value.(types.Evidence)
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if _, ok := blockEvidenceMap[evMapKey(ev)]; ok {
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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 (evpool *Pool) updateState(state sm.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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}
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func bytesToEv(evBytes []byte) (types.Evidence, error) {
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var evpb tmproto.Evidence
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err := evpb.Unmarshal(evBytes)
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if err != nil {
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return &types.DuplicateVoteEvidence{}, err
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}
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return types.EvidenceFromProto(&evpb)
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}
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|
|
|
func evMapKey(ev types.Evidence) string {
|
|
return string(ev.Hash())
|
|
}
|
|
|
|
// big endian padded hex
|
|
func bE(h int64) string {
|
|
return fmt.Sprintf("%0.16X", h)
|
|
}
|
|
|
|
func keyCommitted(evidence types.Evidence) []byte {
|
|
return append([]byte{baseKeyCommitted}, keySuffix(evidence)...)
|
|
}
|
|
|
|
func keyPending(evidence types.Evidence) []byte {
|
|
return append([]byte{baseKeyPending}, keySuffix(evidence)...)
|
|
}
|
|
|
|
func keySuffix(evidence types.Evidence) []byte {
|
|
return []byte(fmt.Sprintf("%s/%X", bE(evidence.Height()), evidence.Hash()))
|
|
}
|