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657 lines
18 KiB
657 lines
18 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/account"
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. "github.com/tendermint/tendermint/binary"
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. "github.com/tendermint/tendermint/block"
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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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stateKey = []byte("stateKey")
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minBondAmount = uint64(1) // TODO adjust
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defaultAccountsCacheCapacity = 1000 // TODO adjust
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unbondingPeriodBlocks = uint(60 * 24 * 365) // TODO probably better to make it time based.
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validatorTimeoutBlocks = uint(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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LastBlockHeight uint
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LastBlockHash []byte
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LastBlockParts PartSetHeader
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LastBlockTime time.Time
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BondedValidators *ValidatorSet
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UnbondingValidators *ValidatorSet
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accounts merkle.Tree // Shouldn't be accessed directly.
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validatorInfos merkle.Tree // Shouldn't be accessed directly.
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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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r, n, err := bytes.NewReader(buf), new(int64), new(error)
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s.LastBlockHeight = ReadUvarint(r, n, err)
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s.LastBlockHash = ReadByteSlice(r, n, err)
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s.LastBlockParts = ReadBinary(PartSetHeader{}, r, n, err).(PartSetHeader)
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s.LastBlockTime = ReadTime(r, n, err)
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s.BondedValidators = ReadBinary(&ValidatorSet{}, r, n, err).(*ValidatorSet)
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s.UnbondingValidators = ReadBinary(&ValidatorSet{}, r, n, err).(*ValidatorSet)
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accountsHash := ReadByteSlice(r, n, err)
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s.accounts = merkle.NewIAVLTree(BasicCodec, AccountCodec, defaultAccountsCacheCapacity, db)
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s.accounts.Load(accountsHash)
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validatorInfosHash := ReadByteSlice(r, n, err)
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s.validatorInfos = merkle.NewIAVLTree(BasicCodec, ValidatorInfoCodec, 0, db)
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s.validatorInfos.Load(validatorInfosHash)
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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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func (s *State) Save() {
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s.accounts.Save()
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s.validatorInfos.Save()
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buf, n, err := new(bytes.Buffer), new(int64), new(error)
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WriteUvarint(s.LastBlockHeight, buf, n, err)
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WriteByteSlice(s.LastBlockHash, buf, n, err)
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WriteBinary(s.LastBlockParts, buf, n, err)
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WriteTime(s.LastBlockTime, buf, n, err)
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WriteBinary(s.BondedValidators, buf, n, err)
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WriteBinary(s.UnbondingValidators, buf, n, err)
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WriteByteSlice(s.accounts.Hash(), buf, n, err)
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WriteByteSlice(s.validatorInfos.Hash(), buf, 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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LastBlockHeight: s.LastBlockHeight,
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LastBlockHash: s.LastBlockHash,
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LastBlockParts: s.LastBlockParts,
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LastBlockTime: s.LastBlockTime,
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BondedValidators: s.BondedValidators.Copy(),
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UnbondingValidators: s.UnbondingValidators.Copy(),
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accounts: s.accounts.Copy(),
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validatorInfos: s.validatorInfos.Copy(),
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}
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}
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// The accounts from the TxInputs must either already have
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// account.PubKey.(type) != PubKeyNil, (it must be known),
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// or it must be specified in the TxInput. But not both.
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func (s *State) GetOrMakeAccounts(ins []*TxInput, outs []*TxOutput) (map[string]*Account, error) {
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accounts := map[string]*Account{}
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for _, in := range ins {
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// Account shouldn't be duplicated
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if _, ok := accounts[string(in.Address)]; ok {
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return nil, ErrTxDuplicateAddress
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}
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account := s.GetAccount(in.Address)
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if account == nil {
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return nil, ErrTxInvalidAddress
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}
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// PubKey should be present in either "account" or "in"
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if _, isNil := account.PubKey.(PubKeyNil); isNil {
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if _, isNil := in.PubKey.(PubKeyNil); isNil {
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return nil, ErrTxUnknownPubKey
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}
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if !bytes.Equal(in.PubKey.Address(), account.Address) {
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return nil, ErrTxInvalidPubKey
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}
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account.PubKey = in.PubKey
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} else {
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if _, isNil := in.PubKey.(PubKeyNil); !isNil {
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return nil, ErrTxRedeclaredPubKey
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}
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}
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accounts[string(in.Address)] = account
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}
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for _, out := range outs {
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// Account shouldn't be duplicated
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if _, ok := accounts[string(out.Address)]; ok {
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return nil, ErrTxDuplicateAddress
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}
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account := s.GetAccount(out.Address)
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// output account may be nil (new)
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if account == nil {
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account = &Account{
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Address: out.Address,
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PubKey: PubKeyNil{},
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Sequence: 0,
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Balance: 0,
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}
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}
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accounts[string(out.Address)] = account
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}
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return accounts, nil
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}
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func (s *State) ValidateInputs(accounts map[string]*Account, signBytes []byte, ins []*TxInput) (total uint64, err error) {
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for _, in := range ins {
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account := accounts[string(in.Address)]
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if account == nil {
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panic("ValidateInputs() expects account in accounts")
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}
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// Check TxInput basic
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if err := in.ValidateBasic(); err != nil {
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return 0, err
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}
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// Check amount
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if account.Balance < in.Amount {
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return 0, ErrTxInsufficientFunds
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}
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// Check signatures
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if !account.PubKey.VerifyBytes(signBytes, in.Signature) {
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return 0, ErrTxInvalidSignature
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}
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// Check sequences
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if account.Sequence+1 != in.Sequence {
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return 0, ErrTxInvalidSequence
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}
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// Good. Add amount to total
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total += in.Amount
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}
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return total, nil
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}
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func (s *State) ValidateOutputs(outs []*TxOutput) (total uint64, err error) {
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for _, out := range outs {
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// Check TxOutput basic
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if err := out.ValidateBasic(); err != nil {
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return 0, err
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}
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// Good. Add amount to total
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total += out.Amount
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}
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return total, nil
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}
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func (s *State) AdjustByInputs(accounts map[string]*Account, ins []*TxInput) {
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for _, in := range ins {
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account := accounts[string(in.Address)]
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if account == nil {
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panic("AdjustByInputs() expects account in accounts")
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}
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if account.Balance < in.Amount {
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panic("AdjustByInputs() expects sufficient funds")
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}
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account.Balance -= in.Amount
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account.Sequence += 1
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}
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}
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func (s *State) AdjustByOutputs(accounts map[string]*Account, outs []*TxOutput) {
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for _, out := range outs {
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account := accounts[string(out.Address)]
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if account == nil {
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panic("AdjustByOutputs() expects account in accounts")
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}
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account.Balance += out.Amount
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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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// TODO: do something with fees
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fees := uint64(0)
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// Exec tx
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switch tx_.(type) {
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case *SendTx:
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tx := tx_.(*SendTx)
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accounts, err := s.GetOrMakeAccounts(tx.Inputs, tx.Outputs)
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if err != nil {
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return err
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}
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signBytes := SignBytes(tx)
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inTotal, err := s.ValidateInputs(accounts, signBytes, tx.Inputs)
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if err != nil {
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return err
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}
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outTotal, err := s.ValidateOutputs(tx.Outputs)
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if err != nil {
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return err
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}
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if outTotal > inTotal {
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return ErrTxInsufficientFunds
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}
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fee := inTotal - outTotal
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fees += fee
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// Good! Adjust accounts
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s.AdjustByInputs(accounts, tx.Inputs)
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s.AdjustByOutputs(accounts, tx.Outputs)
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s.SetAccounts(accounts)
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return nil
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case *BondTx:
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tx := tx_.(*BondTx)
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valInfo := s.GetValidatorInfo(tx.PubKey.Address())
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if valInfo != nil {
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// TODO: In the future, check that the validator wasn't destroyed,
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// add funds, merge UnbondTo outputs, and unbond validator.
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return errors.New("Adding coins to existing validators not yet supported")
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}
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accounts, err := s.GetOrMakeAccounts(tx.Inputs, nil)
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if err != nil {
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return err
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}
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signBytes := SignBytes(tx)
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inTotal, err := s.ValidateInputs(accounts, signBytes, tx.Inputs)
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if err != nil {
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return err
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}
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if err := tx.PubKey.ValidateBasic(); err != nil {
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return err
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}
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outTotal, err := s.ValidateOutputs(tx.UnbondTo)
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if err != nil {
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return err
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}
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if outTotal > inTotal {
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return ErrTxInsufficientFunds
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}
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fee := inTotal - outTotal
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fees += fee
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// Good! Adjust accounts
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s.AdjustByInputs(accounts, tx.Inputs)
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s.SetAccounts(accounts)
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// Add ValidatorInfo
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s.SetValidatorInfo(&ValidatorInfo{
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Address: tx.PubKey.Address(),
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PubKey: tx.PubKey,
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UnbondTo: tx.UnbondTo,
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FirstBondHeight: s.LastBlockHeight + 1,
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FirstBondAmount: outTotal,
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})
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// Add Validator
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added := s.BondedValidators.Add(&Validator{
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Address: tx.PubKey.Address(),
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PubKey: tx.PubKey,
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BondHeight: s.LastBlockHeight + 1,
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VotingPower: outTotal,
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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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tx := tx_.(*UnbondTx)
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// The validator must be active
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_, val := s.BondedValidators.GetByAddress(tx.Address)
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if val == nil {
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return ErrTxInvalidAddress
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}
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// Verify the signature
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signBytes := SignBytes(tx)
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if !val.PubKey.VerifyBytes(signBytes, tx.Signature) {
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return ErrTxInvalidSignature
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}
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// tx.Height must be greater than val.LastCommitHeight
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if tx.Height <= val.LastCommitHeight {
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return errors.New("Invalid unbond height")
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}
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// Good!
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s.unbondValidator(val)
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return nil
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case *RebondTx:
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tx := tx_.(*RebondTx)
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// The validator must be inactive
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_, val := s.UnbondingValidators.GetByAddress(tx.Address)
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if val == nil {
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return ErrTxInvalidAddress
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}
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// Verify the signature
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signBytes := SignBytes(tx)
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if !val.PubKey.VerifyBytes(signBytes, tx.Signature) {
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return ErrTxInvalidSignature
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}
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// tx.Height must be equal to the next height
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if tx.Height != s.LastBlockHeight+1 {
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return errors.New("Invalid rebond height")
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}
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// tx.Height must be
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// Good!
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s.rebondValidator(val)
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return nil
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case *DupeoutTx:
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tx := tx_.(*DupeoutTx)
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// Verify the signatures
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_, accused := s.BondedValidators.GetByAddress(tx.Address)
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voteASignBytes := SignBytes(&tx.VoteA)
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voteBSignBytes := SignBytes(&tx.VoteB)
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if !accused.PubKey.VerifyBytes(voteASignBytes, tx.VoteA.Signature) ||
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!accused.PubKey.VerifyBytes(voteBSignBytes, tx.VoteB.Signature) {
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return ErrTxInvalidSignature
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}
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// Verify equivocation
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// TODO: in the future, just require one vote from a previous height that
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// doesn't exist on this chain.
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if tx.VoteA.Height != tx.VoteB.Height {
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return errors.New("DupeoutTx heights don't match")
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}
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if tx.VoteA.Type == VoteTypeCommit && tx.VoteA.Round < tx.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 tx.VoteA.Round != tx.VoteB.Round {
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return errors.New("DupeoutTx rounds don't match")
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}
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if tx.VoteA.Type != tx.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(tx.VoteA.BlockHash, tx.VoteB.BlockHash) {
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return errors.New("DupeoutTx blockhashes shouldn't match")
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}
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}
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// Good! (Bad validator!)
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s.destroyValidator(accused)
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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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func (s *State) unbondValidator(val *Validator) {
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// Move validator to UnbondingValidators
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val, removed := s.BondedValidators.Remove(val.Address)
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if !removed {
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panic("Couldn't remove validator for unbonding")
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}
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val.UnbondHeight = s.LastBlockHeight + 1
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added := s.UnbondingValidators.Add(val)
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if !added {
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panic("Couldn't add validator for unbonding")
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}
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}
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func (s *State) rebondValidator(val *Validator) {
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// Move validator to BondingValidators
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val, removed := s.UnbondingValidators.Remove(val.Address)
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if !removed {
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panic("Couldn't remove validator for rebonding")
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}
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val.BondHeight = s.LastBlockHeight + 1
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added := s.BondedValidators.Add(val)
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if !added {
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panic("Couldn't add validator for rebonding")
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}
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}
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func (s *State) releaseValidator(val *Validator) {
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// Update validatorInfo
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valInfo := s.GetValidatorInfo(val.Address)
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if valInfo == nil {
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panic("Couldn't find validatorInfo for release")
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}
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valInfo.ReleasedHeight = s.LastBlockHeight + 1
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s.SetValidatorInfo(valInfo)
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// Send coins back to UnbondTo outputs
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accounts, err := s.GetOrMakeAccounts(nil, valInfo.UnbondTo)
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if err != nil {
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panic("Couldn't get or make unbondTo accounts")
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}
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s.AdjustByOutputs(accounts, valInfo.UnbondTo)
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s.SetAccounts(accounts)
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// Remove validator from UnbondingValidators
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_, removed := s.UnbondingValidators.Remove(val.Address)
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if !removed {
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panic("Couldn't remove validator for release")
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}
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}
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func (s *State) destroyValidator(val *Validator) {
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// Update validatorInfo
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valInfo := s.GetValidatorInfo(val.Address)
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if valInfo == nil {
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panic("Couldn't find validatorInfo for release")
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}
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valInfo.DestroyedHeight = s.LastBlockHeight + 1
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valInfo.DestroyedAmount = val.VotingPower
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s.SetValidatorInfo(valInfo)
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// Remove validator
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_, removed := s.BondedValidators.Remove(val.Address)
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if !removed {
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_, removed := s.UnbondingValidators.Remove(val.Address)
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if !removed {
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panic("Couldn't remove validator for destruction")
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}
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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(block *Block, blockPartsHeader PartSetHeader, checkStateHash bool) error {
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// Basic block validation.
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err := block.ValidateBasic(s.LastBlockHeight, s.LastBlockHash, s.LastBlockParts, s.LastBlockTime)
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if err != nil {
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return err
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}
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// Validate block Validation.
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if block.Height == 1 {
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if len(block.Validation.Commits) != 0 {
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return errors.New("Block at height 1 (first block) should have no Validation commits")
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}
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} else {
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if uint(len(block.Validation.Commits)) != s.BondedValidators.Size() {
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return errors.New("Invalid block validation size")
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}
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var sumVotingPower uint64
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s.BondedValidators.Iterate(func(index uint, val *Validator) bool {
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commit := block.Validation.Commits[index]
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if commit.IsZero() {
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return false
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} else {
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vote := &Vote{
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Height: block.Height - 1,
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Round: commit.Round,
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Type: VoteTypeCommit,
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BlockHash: block.LastBlockHash,
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BlockParts: block.LastBlockParts,
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}
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if val.PubKey.VerifyBytes(SignBytes(vote), commit.Signature) {
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sumVotingPower += val.VotingPower
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return false
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} else {
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log.Warning("Invalid validation signature.\nval: %v\nvote: %v", val, vote)
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err = errors.New("Invalid validation signature")
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return true
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|
}
|
|
}
|
|
})
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if sumVotingPower <= s.BondedValidators.TotalVotingPower()*2/3 {
|
|
return errors.New("Insufficient validation voting power")
|
|
}
|
|
}
|
|
|
|
// Commit each tx
|
|
for _, tx := range block.Data.Txs {
|
|
err := s.ExecTx(tx)
|
|
if err != nil {
|
|
return InvalidTxError{tx, err}
|
|
}
|
|
}
|
|
|
|
// Update Validator.LastCommitHeight as necessary.
|
|
for i, commit := range block.Validation.Commits {
|
|
if commit.IsZero() {
|
|
continue
|
|
}
|
|
_, val := s.BondedValidators.GetByIndex(uint(i))
|
|
if val == nil {
|
|
Panicf("Failed to fetch validator at index %v", i)
|
|
}
|
|
val.LastCommitHeight = block.Height - 1
|
|
updated := s.BondedValidators.Update(val)
|
|
if !updated {
|
|
panic("Failed to update validator LastCommitHeight")
|
|
}
|
|
}
|
|
|
|
// If any unbonding periods are over,
|
|
// reward account with bonded coins.
|
|
toRelease := []*Validator{}
|
|
s.UnbondingValidators.Iterate(func(index uint, val *Validator) bool {
|
|
if val.UnbondHeight+unbondingPeriodBlocks < block.Height {
|
|
toRelease = append(toRelease, val)
|
|
}
|
|
return false
|
|
})
|
|
for _, val := range toRelease {
|
|
s.releaseValidator(val)
|
|
}
|
|
|
|
// If any validators haven't signed in a while,
|
|
// unbond them, they have timed out.
|
|
toTimeout := []*Validator{}
|
|
s.BondedValidators.Iterate(func(index uint, val *Validator) bool {
|
|
if val.LastCommitHeight+validatorTimeoutBlocks < block.Height {
|
|
toTimeout = append(toTimeout, val)
|
|
}
|
|
return false
|
|
})
|
|
for _, val := range toTimeout {
|
|
s.unbondValidator(val)
|
|
}
|
|
|
|
// Increment validator AccumPowers
|
|
s.BondedValidators.IncrementAccum(1)
|
|
|
|
// Check or set block.StateHash
|
|
stateHash := s.Hash()
|
|
if checkStateHash {
|
|
// State hash should match
|
|
if !bytes.Equal(stateHash, block.StateHash) {
|
|
return Errorf("Invalid state hash. Got %X, block says %X",
|
|
stateHash, block.StateHash)
|
|
}
|
|
} else {
|
|
// Set the state hash.
|
|
if block.StateHash != nil {
|
|
panic("Cannot overwrite block.StateHash")
|
|
}
|
|
block.StateHash = stateHash
|
|
}
|
|
|
|
s.LastBlockHeight = block.Height
|
|
s.LastBlockHash = block.Hash()
|
|
s.LastBlockParts = blockPartsHeader
|
|
s.LastBlockTime = block.Time
|
|
return nil
|
|
}
|
|
|
|
// The returned Account is a copy, so mutating it
|
|
// has no side effects.
|
|
func (s *State) GetAccount(address []byte) *Account {
|
|
_, account := s.accounts.Get(address)
|
|
if account == nil {
|
|
return nil
|
|
}
|
|
return account.(*Account).Copy()
|
|
}
|
|
|
|
// The account is copied before setting, so mutating it
|
|
// afterwards has no side effects.
|
|
func (s *State) SetAccount(account *Account) {
|
|
s.accounts.Set(account.Address, account.Copy())
|
|
}
|
|
|
|
// The accounts are copied before setting, so mutating it
|
|
// afterwards has no side effects.
|
|
func (s *State) SetAccounts(accounts map[string]*Account) {
|
|
for _, account := range accounts {
|
|
s.accounts.Set(account.Address, account.Copy())
|
|
}
|
|
}
|
|
|
|
// The returned ValidatorInfo is a copy, so mutating it
|
|
// has no side effects.
|
|
func (s *State) GetValidatorInfo(address []byte) *ValidatorInfo {
|
|
_, valInfo := s.validatorInfos.Get(address)
|
|
if valInfo == nil {
|
|
return nil
|
|
}
|
|
return valInfo.(*ValidatorInfo).Copy()
|
|
}
|
|
|
|
// Returns false if new, true if updated.
|
|
// The valInfo is copied before setting, so mutating it
|
|
// afterwards has no side effects.
|
|
func (s *State) SetValidatorInfo(valInfo *ValidatorInfo) (updated bool) {
|
|
return s.validatorInfos.Set(valInfo.Address, valInfo.Copy())
|
|
}
|
|
|
|
// Returns a hash that represents the state data,
|
|
// excluding LastBlock*
|
|
func (s *State) Hash() []byte {
|
|
hashables := []merkle.Hashable{
|
|
s.BondedValidators,
|
|
s.UnbondingValidators,
|
|
s.accounts,
|
|
s.validatorInfos,
|
|
}
|
|
return merkle.HashFromHashables(hashables)
|
|
}
|