Golang WALRecord.GetCheckpoint示例

示例#1

文件： election.go 项目： bvk/ascent

// RecoverCheckpoint restores last known election state from a checkpoint
// record.
func (this *Election) RecoverCheckpoint(uid string, data []byte) error {
	if uid != this.uid {
		// Check if uid belongs to one of our paxos instances.
		if this.IsPaxosUID(uid) {
			paxos, errGet := this.doGetPaxosInstance(uid)
			if errGet != nil {
				this.Errorf("could not find paxos instance for %s: %v", uid, errGet)
				return errGet
			}
			return paxos.RecoverCheckpoint(uid, data)
		}

		this.Errorf("checkpoint record doesn't belong to this instance")
		return errs.ErrInvalid
	}

	walRecord := thispb.WALRecord{}
	if err := proto.Unmarshal(data, &walRecord); err != nil {
		this.Errorf("could not parse checkpoint wal record: %v", err)
		return err
	}

	if walRecord.Checkpoint == nil {
		this.Errorf("checkpoint record has no data")
		return errs.ErrCorrupt
	}
	checkpoint := walRecord.GetCheckpoint()

	this.doRestoreConfig(checkpoint.GetConfiguration())

	if this.InCommittee() {
		if checkpoint.CommitteeState == nil {
			this.Errorf("committee member checkpoint has no election state")
			return errs.ErrCorrupt
		}
		this.doRestoreCommittee(checkpoint.GetCommitteeState())
	}

	this.doRestoreElection(checkpoint.GetElectionState())
	return nil
}