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package evidence
import (
"fmt"
"sync"
clist "github.com/tendermint/tendermint/libs/clist"
dbm "github.com/tendermint/tendermint/libs/db"
"github.com/tendermint/tendermint/libs/log"
sm "github.com/tendermint/tendermint/state"
"github.com/tendermint/tendermint/types"
)
// EvidencePool maintains a pool of valid evidence
// in an EvidenceStore.
type EvidencePool struct {
logger log.Logger
evidenceStore *EvidenceStore
evidenceList *clist.CList // concurrent linked-list of evidence
// needed to load validators to verify evidence
stateDB dbm.DB
// latest state
mtx sync.Mutex
state sm.State
}
func NewEvidencePool(stateDB dbm.DB, evidenceStore *EvidenceStore) *EvidencePool {
evpool := &EvidencePool{
stateDB: stateDB,
state: sm.LoadState(stateDB),
logger: log.NewNopLogger(),
evidenceStore: evidenceStore,
evidenceList: clist.New(),
}
return evpool
}
func (evpool *EvidencePool) EvidenceFront() *clist.CElement {
return evpool.evidenceList.Front()
}
func (evpool *EvidencePool) EvidenceWaitChan() <-chan struct{} {
return evpool.evidenceList.WaitChan()
}
// SetLogger sets the Logger.
func (evpool *EvidencePool) SetLogger(l log.Logger) {
evpool.logger = l
}
// PriorityEvidence returns the priority evidence.
func (evpool *EvidencePool) PriorityEvidence() []types.Evidence {
return evpool.evidenceStore.PriorityEvidence()
}
// PendingEvidence returns all uncommitted evidence.
func (evpool *EvidencePool) PendingEvidence() []types.Evidence {
return evpool.evidenceStore.PendingEvidence()
}
// State returns the current state of the evpool.
func (evpool *EvidencePool) State() sm.State {
evpool.mtx.Lock()
defer evpool.mtx.Unlock()
return evpool.state
}
// Update loads the latest
func (evpool *EvidencePool) Update(block *types.Block, state sm.State) {
// sanity check
if state.LastBlockHeight != block.Height {
panic(fmt.Sprintf("Failed EvidencePool.Update sanity check: got state.Height=%d with block.Height=%d", state.LastBlockHeight, block.Height))
}
// update the state
evpool.mtx.Lock()
evpool.state = state
evpool.mtx.Unlock()
// remove evidence from pending and mark committed
evpool.MarkEvidenceAsCommitted(block.Height, block.Evidence.Evidence)
}
// AddEvidence checks the evidence is valid and adds it to the pool.
func (evpool *EvidencePool) AddEvidence(evidence types.Evidence) (err error) {
// TODO: check if we already have evidence for this
// validator at this height so we dont get spammed
if err := sm.VerifyEvidence(evpool.stateDB, evpool.State(), evidence); err != nil {
return err
}
// fetch the validator and return its voting power as its priority
// TODO: something better ?
valset, _ := sm.LoadValidators(evpool.stateDB, evidence.Height())
_, val := valset.GetByAddress(evidence.Address())
priority := val.VotingPower
added := evpool.evidenceStore.AddNewEvidence(evidence, priority)
if !added {
// evidence already known, just ignore
return
}
evpool.logger.Info("Verified new evidence of byzantine behaviour", "evidence", evidence)
// add evidence to clist
evpool.evidenceList.PushBack(evidence)
return nil
}
// MarkEvidenceAsCommitted marks all the evidence as committed and removes it from the queue.
func (evpool *EvidencePool) MarkEvidenceAsCommitted(height int64, evidence []types.Evidence) {
// make a map of committed evidence to remove from the clist
blockEvidenceMap := make(map[string]struct{})
for _, ev := range evidence {
evpool.evidenceStore.MarkEvidenceAsCommitted(ev)
blockEvidenceMap[evMapKey(ev)] = struct{}{}
}
// remove committed evidence from the clist
maxAge := evpool.State().ConsensusParams.EvidenceParams.MaxAge
evpool.removeEvidence(height, maxAge, blockEvidenceMap)
}
func (evpool *EvidencePool) removeEvidence(height, maxAge int64, blockEvidenceMap map[string]struct{}) {
for e := evpool.evidenceList.Front(); e != nil; e = e.Next() {
ev := e.Value.(types.Evidence)
// Remove the evidence if it's already in a block
// or if it's now too old.
if _, ok := blockEvidenceMap[evMapKey(ev)]; ok ||
ev.Height() < height-maxAge {
// remove from clist
evpool.evidenceList.Remove(e)
e.DetachPrev()
}
}
}
func evMapKey(ev types.Evidence) string {
return string(ev.Hash())
}