// RecoverCheckpoint recovers state from a checkpoint record.
func (this *Paxos) RecoverCheckpoint(uid string, data []byte) error {
if uid != this.uid {
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.ErrInvalid
}
checkpoint := walRecord.GetCheckpoint()
config := checkpoint.GetConfiguration()
this.doRestoreConfig(config)
if this.IsProposer() {
if checkpoint.ProposerState == nil {
this.Errorf("checkpoint record has no proposer state")
return errs.ErrInvalid
}
this.doRestoreProposer(checkpoint.GetProposerState())
}
if this.IsAcceptor() {
if checkpoint.AcceptorState == nil {
this.Errorf("checkpoint record has no acceptor state")
return errs.ErrInvalid
}
this.doRestoreAcceptor(checkpoint.GetAcceptorState())
}
if this.IsLearner() {
if checkpoint.LearnerState == nil {
this.Errorf("checkpoint record has no learner state")
}
this.doRestoreLearner(checkpoint.GetLearnerState())
}
return nil
}
