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187 lines
5.3 KiB
187 lines
5.3 KiB
package state
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import (
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"errors"
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"fmt"
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"io/ioutil"
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"math"
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"sync"
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"github.com/tendermint/tendermint/account"
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"github.com/tendermint/tendermint/binary"
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. "github.com/tendermint/tendermint/common"
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. "github.com/tendermint/tendermint/consensus/types"
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"github.com/tendermint/tendermint/types"
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"github.com/tendermint/tendermint/Godeps/_workspace/src/github.com/tendermint/ed25519"
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)
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const (
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stepNone = 0 // Used to distinguish the initial state
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stepPropose = 1
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stepPrevote = 2
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stepPrecommit = 3
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)
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func voteToStep(vote *types.Vote) int8 {
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switch vote.Type {
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case types.VoteTypePrevote:
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return stepPrevote
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case types.VoteTypePrecommit:
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return stepPrecommit
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default:
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// SANITY CHECK (binary decoding should catch bad vote types
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// before they get here (right?!)
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panic("Unknown vote type")
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}
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}
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type PrivValidator struct {
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Address []byte `json:"address"`
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PubKey account.PubKeyEd25519 `json:"pub_key"`
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PrivKey account.PrivKeyEd25519 `json:"priv_key"`
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LastHeight int `json:"last_height"`
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LastRound int `json:"last_round"`
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LastStep int8 `json:"last_step"`
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// For persistence.
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// Overloaded for testing.
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filePath string
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mtx sync.Mutex
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}
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// Generates a new validator with private key.
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func GenPrivValidator() *PrivValidator {
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privKeyBytes := new([64]byte)
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copy(privKeyBytes[:32], CRandBytes(32))
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pubKeyBytes := ed25519.MakePublicKey(privKeyBytes)
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pubKey := account.PubKeyEd25519(pubKeyBytes[:])
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privKey := account.PrivKeyEd25519(privKeyBytes[:])
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return &PrivValidator{
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Address: pubKey.Address(),
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PubKey: pubKey,
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PrivKey: privKey,
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LastHeight: 0,
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LastRound: 0,
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LastStep: stepNone,
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filePath: "",
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}
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}
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func LoadPrivValidator(filePath string) *PrivValidator {
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privValJSONBytes, err := ioutil.ReadFile(filePath)
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if err != nil {
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Exit(err.Error())
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}
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privVal := binary.ReadJSON(&PrivValidator{}, privValJSONBytes, &err).(*PrivValidator)
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if err != nil {
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Exit(Fmt("Error reading PrivValidator from %v: %v\n", filePath, err))
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}
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privVal.filePath = filePath
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return privVal
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}
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func (privVal *PrivValidator) SetFile(filePath string) {
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privVal.mtx.Lock()
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defer privVal.mtx.Unlock()
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privVal.filePath = filePath
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}
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func (privVal *PrivValidator) Save() {
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privVal.mtx.Lock()
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defer privVal.mtx.Unlock()
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privVal.save()
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}
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func (privVal *PrivValidator) save() {
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if privVal.filePath == "" {
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// SANITY CHECK
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panic("Cannot save PrivValidator: filePath not set")
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}
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jsonBytes := binary.JSONBytes(privVal)
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err := WriteFileAtomic(privVal.filePath, jsonBytes)
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if err != nil {
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// `@; BOOM!!!
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panic(err)
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}
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}
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func (privVal *PrivValidator) SignVote(chainID string, vote *types.Vote) error {
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privVal.mtx.Lock()
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defer privVal.mtx.Unlock()
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// If height regression, panic
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if privVal.LastHeight > vote.Height {
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return errors.New("Height regression in SignVote")
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}
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// More cases for when the height matches
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if privVal.LastHeight == vote.Height {
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// If round regression, panic
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if privVal.LastRound > vote.Round {
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return errors.New("Round regression in SignVote")
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}
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// If step regression, panic
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if privVal.LastRound == vote.Round && privVal.LastStep > voteToStep(vote) {
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return errors.New("Step regression in SignVote")
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}
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}
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// Persist height/round/step
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privVal.LastHeight = vote.Height
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privVal.LastRound = vote.Round
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privVal.LastStep = voteToStep(vote)
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privVal.save()
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// Sign
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privVal.SignVoteUnsafe(chainID, vote)
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return nil
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}
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func (privVal *PrivValidator) SignVoteUnsafe(chainID string, vote *types.Vote) {
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vote.Signature = privVal.PrivKey.Sign(account.SignBytes(chainID, vote)).(account.SignatureEd25519)
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}
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func (privVal *PrivValidator) SignProposal(chainID string, proposal *Proposal) error {
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privVal.mtx.Lock()
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defer privVal.mtx.Unlock()
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if privVal.LastHeight < proposal.Height ||
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privVal.LastHeight == proposal.Height && privVal.LastRound < proposal.Round ||
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privVal.LastHeight == 0 && privVal.LastRound == 0 && privVal.LastStep == stepNone {
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// Persist height/round/step
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privVal.LastHeight = proposal.Height
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privVal.LastRound = proposal.Round
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privVal.LastStep = stepPropose
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privVal.save()
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// Sign
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proposal.Signature = privVal.PrivKey.Sign(account.SignBytes(chainID, proposal)).(account.SignatureEd25519)
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return nil
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} else {
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return errors.New(fmt.Sprintf("Attempt of duplicate signing of proposal: Height %v, Round %v", proposal.Height, proposal.Round))
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}
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}
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func (privVal *PrivValidator) SignRebondTx(chainID string, rebondTx *types.RebondTx) error {
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privVal.mtx.Lock()
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defer privVal.mtx.Unlock()
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if privVal.LastHeight < rebondTx.Height {
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// Persist height/round/step
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// Prevent doing anything else for this rebondTx.Height.
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privVal.LastHeight = rebondTx.Height
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privVal.LastRound = math.MaxInt32 // MaxInt64 overflows on 32bit architectures.
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privVal.LastStep = math.MaxInt8
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privVal.save()
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// Sign
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rebondTx.Signature = privVal.PrivKey.Sign(account.SignBytes(chainID, rebondTx)).(account.SignatureEd25519)
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return nil
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} else {
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return errors.New(fmt.Sprintf("Attempt of duplicate signing of rebondTx: Height %v", rebondTx.Height))
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}
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}
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func (privVal *PrivValidator) String() string {
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return fmt.Sprintf("PrivValidator{%X LH:%v, LR:%v, LS:%v}", privVal.Address, privVal.LastHeight, privVal.LastRound, privVal.LastStep)
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}
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