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120 lines
3.2 KiB
120 lines
3.2 KiB
package evidence
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import (
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"fmt"
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"sync"
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dbm "github.com/tendermint/tmlibs/db"
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"github.com/tendermint/tmlibs/log"
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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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// 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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// never close
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evidenceChan chan types.Evidence
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}
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func NewEvidencePool(stateDB dbm.DB, evidenceStore *EvidenceStore) *EvidencePool {
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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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evidenceChan: make(chan types.Evidence),
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}
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return evpool
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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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// EvidenceChan returns an unbuffered channel on which new evidence can be received.
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func (evpool *EvidencePool) EvidenceChan() <-chan types.Evidence {
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return evpool.evidenceChan
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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 all uncommitted evidence.
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func (evpool *EvidencePool) PendingEvidence() []types.Evidence {
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return evpool.evidenceStore.PendingEvidence()
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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) {
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evpool.mtx.Lock()
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defer evpool.mtx.Unlock()
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state := sm.LoadState(evpool.stateDB)
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if state.LastBlockHeight != block.Height {
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panic(fmt.Sprintf("EvidencePool.Update: loaded state with height %d when block.Height=%d", state.LastBlockHeight, block.Height))
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}
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evpool.state = state
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// NOTE: shouldn't need the mutex
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evpool.MarkEvidenceAsCommitted(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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// Blocks on the EvidenceChan.
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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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// never closes. always safe to send on
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evpool.evidenceChan <- evidence
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return nil
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}
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// MarkEvidenceAsCommitted marks all the evidence as committed.
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func (evpool *EvidencePool) MarkEvidenceAsCommitted(evidence []types.Evidence) {
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for _, ev := range evidence {
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evpool.evidenceStore.MarkEvidenceAsCommitted(ev)
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}
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}
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