// RecoverChange recovers an update from a change record.
func (this *Paxos) RecoverChange(lsn wal.LSN, uid string, data []byte) error {
if lsn == nil {
// We reached end of wal recovery, figure out the current state and resume
// any inflight operations.
_ = this.Refresh()
return nil
}
if uid != this.uid {
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:
return this.doUpdateConfig(walRecord.GetConfigChange())
case walRecord.ProposerChange != nil:
return this.doUpdateProposer(walRecord.GetProposerChange())
case walRecord.AcceptorChange != nil:
return this.doUpdateAcceptor(walRecord.GetAcceptorChange())
case walRecord.LearnerChange != nil:
return this.doUpdateLearner(walRecord.GetLearnerChange())
default:
this.Errorf("invalid/corrupt wal change record: %s", walRecord)
return errs.ErrCorrupt
}
return nil
}
