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429 lines
12 KiB
429 lines
12 KiB
package state
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import (
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"bytes"
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"errors"
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"fmt"
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"time"
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. "github.com/tendermint/tendermint/binary"
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. "github.com/tendermint/tendermint/blocks"
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. "github.com/tendermint/tendermint/common"
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db_ "github.com/tendermint/tendermint/db"
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"github.com/tendermint/tendermint/merkle"
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)
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var (
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ErrStateInvalidAccountId = errors.New("Error State invalid account id")
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ErrStateInvalidSignature = errors.New("Error State invalid signature")
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ErrStateInvalidSequenceNumber = errors.New("Error State invalid sequence number")
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ErrStateInvalidAccountState = errors.New("Error State invalid account state")
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ErrStateInsufficientFunds = errors.New("Error State insufficient funds")
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stateKey = []byte("stateKey")
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minBondAmount = uint64(1) // TODO adjust
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defaultAccountDetailsCacheCapacity = 1000 // TODO adjust
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unbondingPeriodBlocks = uint32(60 * 24 * 365) // TODO probably better to make it time based.
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validatorTimeoutBlocks = uint32(10) // TODO adjust
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)
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//-----------------------------------------------------------------------------
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type InvalidTxError struct {
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Tx Tx
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Reason error
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}
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func (txErr InvalidTxError) Error() string {
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return fmt.Sprintf("Invalid tx: [%v] reason: [%v]", txErr.Tx, txErr.Reason)
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}
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//-----------------------------------------------------------------------------
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// NOTE: not goroutine-safe.
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type State struct {
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DB db_.DB
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Height uint32 // Last known block height
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BlockHash []byte // Last known block hash
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CommitTime time.Time
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accountDetails merkle.Tree // Shouldn't be accessed directly.
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BondedValidators *ValidatorSet
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UnbondingValidators *ValidatorSet
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}
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func GenesisState(db db_.DB, genesisTime time.Time, accDets []*AccountDetail) *State {
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// TODO: Use "uint64Codec" instead of BasicCodec
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accountDetails := merkle.NewIAVLTree(BasicCodec, AccountDetailCodec, defaultAccountDetailsCacheCapacity, db)
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validators := []*Validator{}
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for _, accDet := range accDets {
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accountDetails.Set(accDet.Id, accDet)
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if accDet.Status == AccountStatusBonded {
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validators = append(validators, &Validator{
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Account: accDet.Account,
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BondHeight: 0,
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VotingPower: accDet.Balance,
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Accum: 0,
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})
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}
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}
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if len(validators) == 0 {
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panic("Must have some validators")
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}
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return &State{
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DB: db,
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Height: 0,
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BlockHash: nil,
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CommitTime: genesisTime,
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accountDetails: accountDetails,
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BondedValidators: NewValidatorSet(validators),
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UnbondingValidators: NewValidatorSet(nil),
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}
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}
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func LoadState(db db_.DB) *State {
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s := &State{DB: db}
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buf := db.Get(stateKey)
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if len(buf) == 0 {
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return nil
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} else {
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reader := bytes.NewReader(buf)
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var n int64
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var err error
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s.Height = ReadUInt32(reader, &n, &err)
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s.CommitTime = ReadTime(reader, &n, &err)
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s.BlockHash = ReadByteSlice(reader, &n, &err)
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accountDetailsHash := ReadByteSlice(reader, &n, &err)
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s.accountDetails = merkle.NewIAVLTree(BasicCodec, AccountDetailCodec, defaultAccountDetailsCacheCapacity, db)
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s.accountDetails.Load(accountDetailsHash)
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s.BondedValidators = ReadValidatorSet(reader, &n, &err)
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s.UnbondingValidators = ReadValidatorSet(reader, &n, &err)
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if err != nil {
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panic(err)
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}
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// TODO: ensure that buf is completely read.
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}
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return s
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}
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// Save this state into the db.
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// For convenience, the commitTime (required by ConsensusAgent)
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// is saved here.
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func (s *State) Save(commitTime time.Time) {
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s.CommitTime = commitTime
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s.accountDetails.Save()
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var buf bytes.Buffer
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var n int64
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var err error
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WriteUInt32(&buf, s.Height, &n, &err)
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WriteTime(&buf, commitTime, &n, &err)
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WriteByteSlice(&buf, s.BlockHash, &n, &err)
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WriteByteSlice(&buf, s.accountDetails.Hash(), &n, &err)
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WriteBinary(&buf, s.BondedValidators, &n, &err)
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WriteBinary(&buf, s.UnbondingValidators, &n, &err)
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if err != nil {
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panic(err)
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}
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s.DB.Set(stateKey, buf.Bytes())
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}
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func (s *State) Copy() *State {
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return &State{
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DB: s.DB,
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Height: s.Height,
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CommitTime: s.CommitTime,
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BlockHash: s.BlockHash,
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accountDetails: s.accountDetails.Copy(),
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BondedValidators: s.BondedValidators.Copy(),
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UnbondingValidators: s.UnbondingValidators.Copy(),
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}
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}
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// If the tx is invalid, an error will be returned.
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// Unlike AppendBlock(), state will not be altered.
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func (s *State) ExecTx(tx Tx) error {
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accDet := s.GetAccountDetail(tx.GetSignature().SignerId)
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if accDet == nil {
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return ErrStateInvalidAccountId
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}
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// Check signature
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if !accDet.Verify(tx) {
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return ErrStateInvalidSignature
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}
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// Check and update sequence
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if tx.GetSequence() <= accDet.Sequence {
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return ErrStateInvalidSequenceNumber
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} else {
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// TODO consider prevSequence for tx chaining.
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accDet.Sequence = tx.GetSequence()
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}
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// Subtract fee from balance.
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if accDet.Balance < tx.GetFee() {
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return ErrStateInsufficientFunds
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} else {
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accDet.Balance -= tx.GetFee()
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}
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// Exec tx
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switch tx.(type) {
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case *SendTx:
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stx := tx.(*SendTx)
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toAccDet := s.GetAccountDetail(stx.To)
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// Accounts must be nominal
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if accDet.Status != AccountStatusNominal {
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return ErrStateInvalidAccountState
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}
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if toAccDet.Status != AccountStatusNominal {
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return ErrStateInvalidAccountState
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}
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// Check account balance
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if accDet.Balance < stx.Amount {
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return ErrStateInsufficientFunds
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}
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// Check existence of destination account
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if toAccDet == nil {
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return ErrStateInvalidAccountId
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}
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// Good!
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accDet.Balance -= stx.Amount
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toAccDet.Balance += stx.Amount
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s.SetAccountDetail(accDet)
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s.SetAccountDetail(toAccDet)
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return nil
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//case *NameTx
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case *BondTx:
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//btx := tx.(*BondTx)
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// Account must be nominal
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if accDet.Status != AccountStatusNominal {
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return ErrStateInvalidAccountState
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}
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// Check account balance
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if accDet.Balance < minBondAmount {
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return ErrStateInsufficientFunds
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}
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// Good!
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accDet.Status = AccountStatusBonded
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s.SetAccountDetail(accDet)
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added := s.BondedValidators.Add(&Validator{
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Account: accDet.Account,
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BondHeight: s.Height,
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VotingPower: accDet.Balance,
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Accum: 0,
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})
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if !added {
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panic("Failed to add validator")
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}
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return nil
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case *UnbondTx:
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//utx := tx.(*UnbondTx)
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// Account must be bonded.
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if accDet.Status != AccountStatusBonded {
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return ErrStateInvalidAccountState
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}
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// Good!
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s.unbondValidator(accDet.Id, accDet)
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s.SetAccountDetail(accDet)
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return nil
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case *DupeoutTx:
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{
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// NOTE: accDet is the one who created this transaction.
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// Subtract any fees, save, and forget.
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s.SetAccountDetail(accDet)
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accDet = nil
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}
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dtx := tx.(*DupeoutTx)
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// Verify the signatures
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if dtx.VoteA.SignerId != dtx.VoteB.SignerId {
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return ErrStateInvalidSignature
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}
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accused := s.GetAccountDetail(dtx.VoteA.SignerId)
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if !accused.Verify(&dtx.VoteA) || !accused.Verify(&dtx.VoteB) {
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return ErrStateInvalidSignature
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}
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// Verify equivocation
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if dtx.VoteA.Height != dtx.VoteB.Height {
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return errors.New("DupeoutTx height must be the same.")
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}
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if dtx.VoteA.Type == VoteTypeCommit && dtx.VoteA.Round < dtx.VoteB.Round {
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// Check special case.
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// Validators should not sign another vote after committing.
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} else {
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if dtx.VoteA.Round != dtx.VoteB.Round {
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return errors.New("DupeoutTx rounds don't match")
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}
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if dtx.VoteA.Type != dtx.VoteB.Type {
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return errors.New("DupeoutTx types don't match")
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}
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if bytes.Equal(dtx.VoteA.BlockHash, dtx.VoteB.BlockHash) {
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return errors.New("DupeoutTx blockhash shouldn't match")
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}
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}
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// Good! (Bad validator!)
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if accused.Status == AccountStatusBonded {
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_, removed := s.BondedValidators.Remove(accused.Id)
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if !removed {
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panic("Failed to remove accused validator")
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}
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} else if accused.Status == AccountStatusUnbonding {
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_, removed := s.UnbondingValidators.Remove(accused.Id)
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if !removed {
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panic("Failed to remove accused validator")
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}
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} else {
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panic("Couldn't find accused validator")
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}
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accused.Status = AccountStatusDupedOut
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updated := s.SetAccountDetail(accused)
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if !updated {
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panic("Failed to update accused validator account")
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}
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return nil
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default:
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panic("Unknown Tx type")
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}
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}
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// accDet optional
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func (s *State) unbondValidator(accountId uint64, accDet *AccountDetail) {
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if accDet == nil {
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accDet = s.GetAccountDetail(accountId)
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}
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accDet.Status = AccountStatusUnbonding
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s.SetAccountDetail(accDet)
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val, removed := s.BondedValidators.Remove(accDet.Id)
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if !removed {
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panic("Failed to remove validator")
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}
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val.UnbondHeight = s.Height
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added := s.UnbondingValidators.Add(val)
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if !added {
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panic("Failed to add validator")
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}
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}
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func (s *State) releaseValidator(accountId uint64) {
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accDet := s.GetAccountDetail(accountId)
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if accDet.Status != AccountStatusUnbonding {
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panic("Cannot release validator")
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}
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accDet.Status = AccountStatusNominal
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// TODO: move balance to designated address, UnbondTo.
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s.SetAccountDetail(accDet)
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_, removed := s.UnbondingValidators.Remove(accountId)
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if !removed {
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panic("Couldn't release validator")
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}
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}
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// "checkStateHash": If false, instead of checking the resulting
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// state.Hash() against block.StateHash, it *sets* the block.StateHash.
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// (used for constructing a new proposal)
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// NOTE: If an error occurs during block execution, state will be left
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// at an invalid state. Copy the state before calling AppendBlock!
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func (s *State) AppendBlock(b *Block, checkStateHash bool) error {
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// Basic block validation.
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err := b.ValidateBasic(s.Height, s.BlockHash)
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if err != nil {
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return err
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}
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// Commit each tx
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for _, tx := range b.Data.Txs {
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err := s.ExecTx(tx)
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if err != nil {
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return InvalidTxError{tx, err}
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}
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}
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// Update LastCommitHeight as necessary.
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for _, sig := range b.Validation.Signatures {
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_, val := s.BondedValidators.GetById(sig.SignerId)
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if val == nil {
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return ErrStateInvalidSignature
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}
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val.LastCommitHeight = b.Height
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updated := s.BondedValidators.Update(val)
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if !updated {
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panic("Failed to update validator LastCommitHeight")
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}
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}
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// If any unbonding periods are over,
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// reward account with bonded coins.
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toRelease := []*Validator{}
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s.UnbondingValidators.Iterate(func(val *Validator) bool {
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if val.UnbondHeight+unbondingPeriodBlocks < b.Height {
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toRelease = append(toRelease, val)
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}
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return false
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})
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for _, val := range toRelease {
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s.releaseValidator(val.Id)
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}
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// If any validators haven't signed in a while,
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// unbond them, they have timed out.
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toTimeout := []*Validator{}
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s.BondedValidators.Iterate(func(val *Validator) bool {
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if val.LastCommitHeight+validatorTimeoutBlocks < b.Height {
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toTimeout = append(toTimeout, val)
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}
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return false
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})
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for _, val := range toTimeout {
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s.unbondValidator(val.Id, nil)
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}
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// Increment validator AccumPowers
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s.BondedValidators.IncrementAccum()
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// Check or set block.StateHash
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stateHash := s.Hash()
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if checkStateHash {
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// State hash should match
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if !bytes.Equal(stateHash, b.StateHash) {
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return Errorf("Invalid state hash. Got %X, block says %X",
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stateHash, b.StateHash)
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}
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} else {
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// Set the state hash.
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if b.StateHash != nil {
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panic("Cannot overwrite block.StateHash")
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}
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b.StateHash = stateHash
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}
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s.Height = b.Height
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s.BlockHash = b.Hash()
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return nil
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}
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// The returned AccountDetail is a copy, so mutating it
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// has no side effects.
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func (s *State) GetAccountDetail(accountId uint64) *AccountDetail {
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_, accDet := s.accountDetails.Get(accountId)
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if accDet == nil {
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return nil
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}
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return accDet.(*AccountDetail).Copy()
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}
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// Returns false if new, true if updated.
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// The accDet is copied before setting, so mutating it
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// afterwards has no side effects.
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func (s *State) SetAccountDetail(accDet *AccountDetail) (updated bool) {
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return s.accountDetails.Set(accDet.Id, accDet.Copy())
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}
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// Returns a hash that represents the state data,
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// excluding Height, BlockHash, and CommitTime.
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func (s *State) Hash() []byte {
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hashables := []merkle.Hashable{
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s.accountDetails,
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s.BondedValidators,
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s.UnbondingValidators,
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}
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return merkle.HashFromHashables(hashables)
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}
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