// RecoverChange updates election state from a change record.
func (this *Election) RecoverChange(lsn wal.LSN, 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.RecoverChange(lsn, uid, data)
}
this.Errorf("change 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 change record: %v", err)
return err
}
switch {
case walRecord.ConfigChange != nil:
this.doRestoreConfig(walRecord.GetConfigChange())
return nil
case walRecord.CommitteeChange != nil:
if !this.InCommittee() {
this.Errorf("found committee change when instance is not a member")
return errs.ErrCorrupt
}
return this.doUpdateCommittee(walRecord.GetCommitteeChange())
case walRecord.ElectionChange != nil:
return this.doUpdateElection(walRecord.GetElectionChange())
default:
this.Errorf("invalid/unknown change record %s", walRecord)
return errs.ErrInvalid
}
return nil
}
