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package evidence
import (
"fmt"
"sync"
dbm "github.com/tendermint/tmlibs/db"
"github.com/tendermint/tmlibs/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
// needed to load validators to verify evidence
stateDB dbm.DB
// latest state
mtx sync.Mutex
state sm.State
// never close
evidenceChan chan types.Evidence
}
func NewEvidencePool(stateDB dbm.DB, evidenceStore *EvidenceStore) *EvidencePool {
evpool := &EvidencePool{
stateDB: stateDB,
state: sm.LoadState(stateDB),
logger: log.NewNopLogger(),
evidenceStore: evidenceStore,
evidenceChan: make(chan types.Evidence),
}
return evpool
}
// SetLogger sets the Logger.
func (evpool *EvidencePool) SetLogger(l log.Logger) {
evpool.logger = l
}
// EvidenceChan returns an unbuffered channel on which new evidence can be received.
func (evpool *EvidencePool) EvidenceChan() <-chan types.Evidence {
return evpool.evidenceChan
}
// 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) {
evpool.mtx.Lock()
defer evpool.mtx.Unlock()
state := sm.LoadState(evpool.stateDB)
if state.LastBlockHeight != block.Height {
panic(fmt.Sprintf("EvidencePool.Update: loaded state with height %d when block.Height=%d", state.LastBlockHeight, block.Height))
}
evpool.state = state
// NOTE: shouldn't need the mutex
evpool.MarkEvidenceAsCommitted(block.Evidence.Evidence)
}
// AddEvidence checks the evidence is valid and adds it to the pool.
// Blocks on the EvidenceChan.
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)
// never closes. always safe to send on
evpool.evidenceChan <- evidence
return nil
}
// MarkEvidenceAsCommitted marks all the evidence as committed.
func (evpool *EvidencePool) MarkEvidenceAsCommitted(evidence []types.Evidence) {
for _, ev := range evidence {
evpool.evidenceStore.MarkEvidenceAsCommitted(ev)
}
}