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165 lines
4.6 KiB
165 lines
4.6 KiB
package evidence
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import (
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"fmt"
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"sync"
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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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dbm "github.com/tendermint/tm-db"
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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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// EvidencePool maintains a pool of valid evidence
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// in an EvidenceStore.
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type EvidencePool struct {
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logger log.Logger
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evidenceStore *EvidenceStore
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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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// latest state
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mtx sync.Mutex
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state sm.State
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}
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func NewEvidencePool(stateDB, evidenceDB dbm.DB) *EvidencePool {
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evidenceStore := NewEvidenceStore(evidenceDB)
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evpool := &EvidencePool{
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stateDB: stateDB,
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state: sm.LoadState(stateDB),
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logger: log.NewNopLogger(),
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evidenceStore: evidenceStore,
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evidenceList: clist.New(),
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}
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return evpool
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}
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func (evpool *EvidencePool) EvidenceFront() *clist.CElement {
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return evpool.evidenceList.Front()
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}
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func (evpool *EvidencePool) 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 *EvidencePool) SetLogger(l log.Logger) {
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evpool.logger = l
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}
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// PriorityEvidence returns the priority evidence.
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func (evpool *EvidencePool) PriorityEvidence() []types.Evidence {
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return evpool.evidenceStore.PriorityEvidence()
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}
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// PendingEvidence returns up to maxNum uncommitted evidence.
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// If maxNum is -1, all evidence is returned.
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func (evpool *EvidencePool) PendingEvidence(maxNum int64) []types.Evidence {
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return evpool.evidenceStore.PendingEvidence(maxNum)
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}
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// State returns the current state of the evpool.
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func (evpool *EvidencePool) 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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// Update loads the latest
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func (evpool *EvidencePool) 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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// update the state
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evpool.mtx.Lock()
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evpool.state = state
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evpool.mtx.Unlock()
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// remove evidence from pending and mark committed
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evpool.MarkEvidenceAsCommitted(block.Height, block.Evidence.Evidence)
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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 *EvidencePool) AddEvidence(evidence types.Evidence) (err error) {
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// TODO: check if we already have evidence for this
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// validator at this height so we dont get spammed
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if err := sm.VerifyEvidence(evpool.stateDB, evpool.State(), evidence); err != nil {
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return err
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}
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// fetch the validator and return its voting power as its priority
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// TODO: something better ?
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valset, _ := sm.LoadValidators(evpool.stateDB, evidence.Height())
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_, val := valset.GetByAddress(evidence.Address())
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priority := val.VotingPower
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added := evpool.evidenceStore.AddNewEvidence(evidence, priority)
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if !added {
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// evidence already known, just ignore
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return
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}
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evpool.logger.Info("Verified new evidence of byzantine behaviour", "evidence", evidence)
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// add evidence to clist
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evpool.evidenceList.PushBack(evidence)
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return nil
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}
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// MarkEvidenceAsCommitted marks all the evidence as committed and removes it from the queue.
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func (evpool *EvidencePool) MarkEvidenceAsCommitted(height int64, 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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evpool.evidenceStore.MarkEvidenceAsCommitted(ev)
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blockEvidenceMap[evMapKey(ev)] = struct{}{}
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}
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// remove committed evidence from the clist
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maxAge := evpool.State().ConsensusParams.Evidence.MaxAge
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evpool.removeEvidence(height, maxAge, blockEvidenceMap)
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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 *EvidencePool) IsCommitted(evidence types.Evidence) bool {
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ei := evpool.evidenceStore.getEvidenceInfo(evidence)
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return ei.Evidence != nil && ei.Committed
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}
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func (evpool *EvidencePool) removeEvidence(height, maxAge int64, blockEvidenceMap map[string]struct{}) {
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for e := evpool.evidenceList.Front(); e != nil; e = e.Next() {
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ev := e.Value.(types.Evidence)
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// Remove the evidence if it's already in a block
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// or if it's now too old.
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if _, ok := blockEvidenceMap[evMapKey(ev)]; ok ||
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ev.Height() < height-maxAge {
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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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