Method AddEvidence

evidence/pool.go:134–168

AddEvidence checks the evidence is valid and adds it to the pool.

(ev types.Evidence)

// AddEvidence checks the evidence is valid and adds it to the pool.
func (evpool *Pool) AddEvidence(ev types.Evidence) error {
	evpool.logger.Debug("Attempting to add evidence", "ev", ev)

	// We have already verified this piece of evidence - no need to do it again
	if evpool.isPending(ev) {
		evpool.logger.Debug("Evidence already pending, ignoring this one", "ev", ev)
		return nil
	}

	// check that the evidence isn't already committed
	if evpool.isCommitted(ev) {
		// this can happen if the peer that sent us the evidence is behind so we shouldn't
		// punish the peer.
		evpool.logger.Debug("Evidence was already committed, ignoring this one", "ev", ev)
		return nil
	}

	// 1) Verify against state.
	err := evpool.verify(ev)
	if err != nil {
		return types.NewErrInvalidEvidence(ev, err)
	}

	// 2) Save to store.
	if err := evpool.addPendingEvidence(ev); err != nil {
		return fmt.Errorf("can't add evidence to pending list: %w", err)
	}

	// 3) Add evidence to clist.
	evpool.evidenceList.PushBack(ev)

	evpool.logger.Info("Verified new evidence of byzantine behavior", "evidence", ev)

	return nil
}

// ReportConflictingVotes takes two conflicting votes and forms duplicate vote evidence,
// adding it eventually to the evidence pool.