package state // TODO: This logic is crude. Should be more transactional. import ( "errors" "fmt" "io/ioutil" "math" "sync" "github.com/tendermint/tendermint/account" "github.com/tendermint/tendermint/binary" . "github.com/tendermint/tendermint/common" "github.com/tendermint/tendermint/config" . "github.com/tendermint/tendermint/consensus/types" "github.com/tendermint/tendermint/types" "github.com/tendermint/ed25519" ) const ( stepNone = 0 // Used to distinguish the initial state stepPropose = 1 stepPrevote = 2 stepPrecommit = 3 stepCommit = 4 ) func voteToStep(vote *types.Vote) uint8 { switch vote.Type { case types.VoteTypePrevote: return stepPrevote case types.VoteTypePrecommit: return stepPrecommit case types.VoteTypeCommit: return stepCommit default: panic("Unknown vote type") } } type PrivValidator struct { Address []byte PubKey account.PubKeyEd25519 PrivKey account.PrivKeyEd25519 LastHeight uint LastRound uint LastStep uint8 // For persistence. // Overloaded for testing. filename string mtx sync.Mutex } // Generates a new validator with private key. func GenPrivValidator() *PrivValidator { privKeyBytes := new([64]byte) copy(privKeyBytes[:32], CRandBytes(32)) pubKeyBytes := ed25519.MakePublicKey(privKeyBytes) pubKey := account.PubKeyEd25519(pubKeyBytes[:]) privKey := account.PrivKeyEd25519(privKeyBytes[:]) return &PrivValidator{ Address: pubKey.Address(), PubKey: pubKey, PrivKey: privKey, LastHeight: 0, LastRound: 0, LastStep: stepNone, filename: config.App().GetString("PrivValidatorFile"), } } func LoadPrivValidator(filename string) *PrivValidator { privValJSONBytes, err := ioutil.ReadFile(filename) if err != nil { panic(err) } privVal := binary.ReadJSON(&PrivValidator{}, privValJSONBytes, &err).(*PrivValidator) if err != nil { Exit(Fmt("Error reading PrivValidator from %v: %v\n", filename, err)) } privVal.filename = filename return privVal } func (privVal *PrivValidator) SetFile(filename string) { privVal.mtx.Lock() defer privVal.mtx.Unlock() privVal.filename = filename } func (privVal *PrivValidator) Save() { privVal.mtx.Lock() defer privVal.mtx.Unlock() privVal.save() } func (privVal *PrivValidator) save() { jsonBytes := binary.JSONBytes(privVal) err := AtomicWriteFile(privVal.filename, jsonBytes) if err != nil { // `@; BOOM!!! panic(err) } } // TODO: test func (privVal *PrivValidator) SignVote(vote *types.Vote) error { privVal.mtx.Lock() defer privVal.mtx.Unlock() // If height regression, panic if privVal.LastHeight > vote.Height { return errors.New("Height regression in SignVote") } // More cases for when the height matches if privVal.LastHeight == vote.Height { // If attempting any sign after commit, panic if privVal.LastStep == stepCommit { return errors.New("SignVote on matching height after a commit") } // If round regression, panic if privVal.LastRound > vote.Round { return errors.New("Round regression in SignVote") } // If step regression, panic if privVal.LastRound == vote.Round && privVal.LastStep > voteToStep(vote) { return errors.New("Step regression in SignVote") } } // Persist height/round/step privVal.LastHeight = vote.Height privVal.LastRound = vote.Round privVal.LastStep = voteToStep(vote) privVal.save() // Sign privVal.SignVoteUnsafe(vote) return nil } func (privVal *PrivValidator) SignVoteUnsafe(vote *types.Vote) { vote.Signature = privVal.PrivKey.Sign(account.SignBytes(vote)).(account.SignatureEd25519) } func (privVal *PrivValidator) SignProposal(proposal *Proposal) error { privVal.mtx.Lock() defer privVal.mtx.Unlock() if privVal.LastHeight < proposal.Height || privVal.LastHeight == proposal.Height && privVal.LastRound < proposal.Round || privVal.LastHeight == 0 && privVal.LastRound == 0 && privVal.LastStep == stepNone { // Persist height/round/step privVal.LastHeight = proposal.Height privVal.LastRound = proposal.Round privVal.LastStep = stepPropose privVal.save() // Sign proposal.Signature = privVal.PrivKey.Sign(account.SignBytes(proposal)).(account.SignatureEd25519) return nil } else { return errors.New(fmt.Sprintf("Attempt of duplicate signing of proposal: Height %v, Round %v", proposal.Height, proposal.Round)) } } func (privVal *PrivValidator) SignRebondTx(rebondTx *types.RebondTx) error { privVal.mtx.Lock() defer privVal.mtx.Unlock() if privVal.LastHeight < rebondTx.Height { // Persist height/round/step privVal.LastHeight = rebondTx.Height privVal.LastRound = math.MaxUint64 // We can't do anything else for this rebondTx.Height. privVal.LastStep = math.MaxUint8 privVal.save() // Sign rebondTx.Signature = privVal.PrivKey.Sign(account.SignBytes(rebondTx)).(account.SignatureEd25519) return nil } else { return errors.New(fmt.Sprintf("Attempt of duplicate signing of rebondTx: Height %v", rebondTx.Height)) } } func (privVal *PrivValidator) String() string { return fmt.Sprintf("PrivValidator{%X LH:%v, LR:%v, LS:%v}", privVal.Address, privVal.LastHeight, privVal.LastRound, privVal.LastStep) }