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642 lines
19 KiB
642 lines
19 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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"github.com/tendermint/tendermint/account"
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. "github.com/tendermint/tendermint/common"
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"github.com/tendermint/tendermint/events"
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"github.com/tendermint/tendermint/types"
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"github.com/tendermint/tendermint/vm"
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)
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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 ExecBlock!
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func ExecBlock(s *State, block *types.Block, blockPartsHeader types.PartSetHeader) error {
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err := execBlock(s, block, blockPartsHeader)
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if err != nil {
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return err
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}
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// State.Hash should match block.StateHash
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stateHash := s.Hash()
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if !bytes.Equal(stateHash, block.StateHash) {
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return fmt.Errorf("Invalid state hash. Expected %X, got %X",
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stateHash, block.StateHash)
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}
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return nil
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}
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// executes transactions of a block, does not check block.StateHash
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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 execBlock!
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func execBlock(s *State, block *types.Block, blockPartsHeader types.PartSetHeader) 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.LastBondedValidators.Size() {
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return errors.New(Fmt("Invalid block validation size. Expected %v, got %v",
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s.LastBondedValidators.Size(), len(block.Validation.Commits)))
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}
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var sumVotingPower uint64
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s.LastBondedValidators.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 := &types.Vote{
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Height: block.Height - 1,
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Round: commit.Round,
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Type: types.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(account.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.Warn(Fmt("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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}
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}
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})
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if err != nil {
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return err
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}
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if sumVotingPower <= s.LastBondedValidators.TotalVotingPower()*2/3 {
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return errors.New("Insufficient validation voting power")
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}
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}
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// Update Validator.LastCommitHeight as necessary.
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for i, commit := range block.Validation.Commits {
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if commit.IsZero() {
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continue
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}
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_, val := s.LastBondedValidators.GetByIndex(uint(i))
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if val == nil {
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panic(Fmt("Failed to fetch validator at index %v", i))
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}
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if _, val_ := s.BondedValidators.GetByAddress(val.Address); val_ != nil {
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val_.LastCommitHeight = block.Height - 1
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updated := s.BondedValidators.Update(val_)
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if !updated {
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panic("Failed to update bonded validator LastCommitHeight")
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}
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} else if _, val_ := s.UnbondingValidators.GetByAddress(val.Address); val_ != nil {
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val_.LastCommitHeight = block.Height - 1
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updated := s.UnbondingValidators.Update(val_)
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if !updated {
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panic("Failed to update unbonding validator LastCommitHeight")
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}
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} else {
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panic("Could not find validator")
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}
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}
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// Remember LastBondedValidators
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s.LastBondedValidators = s.BondedValidators.Copy()
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// Create BlockCache to cache changes to state.
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blockCache := NewBlockCache(s)
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// Commit each tx
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for _, tx := range block.Data.Txs {
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err := ExecTx(blockCache, tx, true, s.evc)
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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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// Now sync the BlockCache to the backend.
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blockCache.Sync()
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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(index uint, val *Validator) bool {
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if val.UnbondHeight+unbondingPeriodBlocks < block.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)
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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(index uint, val *Validator) bool {
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lastActivityHeight := MaxUint(val.BondHeight, val.LastCommitHeight)
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if lastActivityHeight+validatorTimeoutBlocks < block.Height {
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log.Info("Validator timeout", "validator", val, "height", block.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)
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}
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// Increment validator AccumPowers
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s.BondedValidators.IncrementAccum(1)
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s.LastBlockHeight = block.Height
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s.LastBlockHash = block.Hash()
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s.LastBlockParts = blockPartsHeader
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s.LastBlockTime = block.Time
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return nil
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}
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// The accounts from the TxInputs must either already have
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// account.PubKey.(type) != nil, (it must be known),
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// or it must be specified in the TxInput. If redeclared,
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// the TxInput is modified and input.PubKey set to nil.
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func getOrMakeAccounts(state AccountGetter, ins []*types.TxInput, outs []*types.TxOutput) (map[string]*account.Account, error) {
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accounts := map[string]*account.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, types.ErrTxDuplicateAddress
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}
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acc := state.GetAccount(in.Address)
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if acc == nil {
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return nil, types.ErrTxInvalidAddress
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}
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// PubKey should be present in either "account" or "in"
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if err := checkInputPubKey(acc, in); err != nil {
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return nil, err
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}
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accounts[string(in.Address)] = acc
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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, types.ErrTxDuplicateAddress
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}
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acc := state.GetAccount(out.Address)
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// output account may be nil (new)
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if acc == nil {
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acc = &account.Account{
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Address: out.Address,
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PubKey: nil,
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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)] = acc
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}
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return accounts, nil
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}
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func checkInputPubKey(acc *account.Account, in *types.TxInput) error {
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if acc.PubKey == nil {
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if in.PubKey == nil {
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return types.ErrTxUnknownPubKey
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}
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if !bytes.Equal(in.PubKey.Address(), acc.Address) {
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return types.ErrTxInvalidPubKey
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}
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acc.PubKey = in.PubKey
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} else {
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in.PubKey = nil
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}
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return nil
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}
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func validateInputs(accounts map[string]*account.Account, signBytes []byte, ins []*types.TxInput) (total uint64, err error) {
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for _, in := range ins {
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acc := accounts[string(in.Address)]
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if acc == nil {
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panic("validateInputs() expects account in accounts")
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}
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err = validateInput(acc, signBytes, in)
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if err != nil {
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return
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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 validateInput(acc *account.Account, signBytes []byte, in *types.TxInput) (err error) {
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// Check TxInput basic
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if err := in.ValidateBasic(); err != nil {
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return err
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}
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// Check signatures
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if !acc.PubKey.VerifyBytes(signBytes, in.Signature) {
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return types.ErrTxInvalidSignature
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}
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// Check sequences
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if acc.Sequence+1 != in.Sequence {
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return types.ErrTxInvalidSequence{
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Got: uint64(in.Sequence),
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Expected: uint64(acc.Sequence + 1),
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}
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}
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// Check amount
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if acc.Balance < in.Amount {
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return types.ErrTxInsufficientFunds
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}
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return nil
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}
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func validateOutputs(outs []*types.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 adjustByInputs(accounts map[string]*account.Account, ins []*types.TxInput) {
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for _, in := range ins {
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acc := accounts[string(in.Address)]
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if acc == nil {
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panic("adjustByInputs() expects account in accounts")
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}
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if acc.Balance < in.Amount {
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panic("adjustByInputs() expects sufficient funds")
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}
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acc.Balance -= in.Amount
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acc.Sequence += 1
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}
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}
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func adjustByOutputs(accounts map[string]*account.Account, outs []*types.TxOutput) {
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for _, out := range outs {
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acc := accounts[string(out.Address)]
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if acc == nil {
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panic("adjustByOutputs() expects account in accounts")
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}
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acc.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 ExecBlock(), state will not be altered.
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func ExecTx(blockCache *BlockCache, tx_ types.Tx, runCall bool, evc events.Fireable) error {
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// TODO: do something with fees
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fees := uint64(0)
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_s := blockCache.State() // hack to access validators and event switch.
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// Exec tx
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switch tx := tx_.(type) {
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case *types.SendTx:
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accounts, err := getOrMakeAccounts(blockCache, 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 := account.SignBytes(tx)
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inTotal, err := 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 := 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 types.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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adjustByInputs(accounts, tx.Inputs)
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adjustByOutputs(accounts, tx.Outputs)
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for _, acc := range accounts {
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blockCache.UpdateAccount(acc)
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}
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// if the evc is nil, nothing will happen
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if evc != nil {
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for _, i := range tx.Inputs {
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evc.FireEvent(types.EventStringAccInput(i.Address), tx)
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}
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for _, o := range tx.Outputs {
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evc.FireEvent(types.EventStringAccOutput(o.Address), tx)
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}
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}
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return nil
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case *types.CallTx:
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var inAcc, outAcc *account.Account
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// Validate input
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inAcc = blockCache.GetAccount(tx.Input.Address)
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if inAcc == nil {
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log.Debug(Fmt("Can't find in account %X", tx.Input.Address))
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return types.ErrTxInvalidAddress
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}
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// pubKey should be present in either "inAcc" or "tx.Input"
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if err := checkInputPubKey(inAcc, tx.Input); err != nil {
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log.Debug(Fmt("Can't find pubkey for %X", tx.Input.Address))
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return err
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}
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signBytes := account.SignBytes(tx)
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err := validateInput(inAcc, signBytes, tx.Input)
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if err != nil {
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log.Debug(Fmt("validateInput failed on %X:", tx.Input.Address))
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return err
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}
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if tx.Input.Amount < tx.Fee {
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log.Debug(Fmt("Sender did not send enough to cover the fee %X", tx.Input.Address))
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return types.ErrTxInsufficientFunds
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}
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createAccount := len(tx.Address) == 0
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if !createAccount {
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// Validate output
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if len(tx.Address) != 20 {
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log.Debug(Fmt("Destination address is not 20 bytes %X", tx.Address))
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return types.ErrTxInvalidAddress
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}
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// this may be nil if we are still in mempool and contract was created in same block as this tx
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// but that's fine, because the account will be created properly when the create tx runs in the block
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// and then this won't return nil. otherwise, we take their fee
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outAcc = blockCache.GetAccount(tx.Address)
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}
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log.Debug(Fmt("Out account: %v", outAcc))
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// Good!
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value := tx.Input.Amount - tx.Fee
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inAcc.Sequence += 1
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if runCall {
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var (
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gas uint64 = tx.GasLimit
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err error = nil
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caller *vm.Account = toVMAccount(inAcc)
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callee *vm.Account = nil
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code []byte = nil
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txCache = NewTxCache(blockCache)
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params = vm.Params{
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BlockHeight: uint64(_s.LastBlockHeight),
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BlockHash: LeftPadWord256(_s.LastBlockHash),
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BlockTime: _s.LastBlockTime.Unix(),
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GasLimit: 10000000,
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}
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)
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// Maybe create a new callee account if
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// this transaction is creating a new contract.
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if !createAccount {
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if outAcc == nil || len(outAcc.Code) == 0 {
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// if you call an account that doesn't exist
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// or an account with no code then we take fees (sorry pal)
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// NOTE: it's fine to create a contract and call it within one
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// block (nonce will prevent re-ordering of those txs)
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// but to create with one account and call with another
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// you have to wait a block to avoid a re-ordering attack
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// that will take your fees
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inAcc.Balance -= tx.Fee
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blockCache.UpdateAccount(inAcc)
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if outAcc == nil {
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log.Debug(Fmt("Cannot find destination address %X. Deducting fee from caller", tx.Address))
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} else {
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log.Debug(Fmt("Attempting to call an account (%X) with no code. Deducting fee from caller", tx.Address))
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}
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return types.ErrTxInvalidAddress
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}
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callee = toVMAccount(outAcc)
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code = callee.Code
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log.Debug(Fmt("Calling contract %X with code %X", callee.Address, callee.Code))
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} else {
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callee = txCache.CreateAccount(caller)
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log.Debug(Fmt("Created new account %X", callee.Address))
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code = tx.Data
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}
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log.Debug(Fmt("Code for this contract: %X", code))
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txCache.UpdateAccount(caller) // because we adjusted by input above, and bumped nonce maybe.
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txCache.UpdateAccount(callee) // because we adjusted by input above.
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vmach := vm.NewVM(txCache, params, caller.Address, account.HashSignBytes(tx))
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vmach.SetFireable(evc)
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// NOTE: Call() transfers the value from caller to callee iff call succeeds.
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ret, err := vmach.Call(caller, callee, code, tx.Data, value, &gas)
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exception := ""
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if err != nil {
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exception = err.Error()
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// Failure. Charge the gas fee. The 'value' was otherwise not transferred.
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log.Debug(Fmt("Error on execution: %v", err))
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inAcc.Balance -= tx.Fee
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blockCache.UpdateAccount(inAcc)
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// Throw away 'txCache' which holds incomplete updates (don't sync it).
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} else {
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log.Debug("Successful execution")
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// Success
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if createAccount {
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callee.Code = ret
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}
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txCache.Sync()
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}
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// Create a receipt from the ret and whether errored.
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log.Info("VM call complete", "caller", caller, "callee", callee, "return", ret, "err", err)
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// Fire Events for sender and receiver
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// a separate event will be fired from vm for each additional call
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if evc != nil {
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evc.FireEvent(types.EventStringAccInput(tx.Input.Address), types.EventMsgCallTx{tx, ret, exception})
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evc.FireEvent(types.EventStringAccOutput(tx.Address), types.EventMsgCallTx{tx, ret, exception})
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}
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} else {
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// The mempool does not call txs until
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// the proposer determines the order of txs.
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// So mempool will skip the actual .Call(),
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// and only deduct from the caller's balance.
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inAcc.Balance -= value
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if createAccount {
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inAcc.Sequence += 1
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}
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blockCache.UpdateAccount(inAcc)
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}
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return nil
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case *types.BondTx:
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valInfo := blockCache.State().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 := getOrMakeAccounts(blockCache, 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 := account.SignBytes(tx)
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inTotal, err := 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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if !tx.PubKey.VerifyBytes(signBytes, tx.Signature) {
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return types.ErrTxInvalidSignature
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}
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outTotal, err := 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 types.ErrTxInsufficientFunds
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}
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fee := inTotal - outTotal
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|
fees += fee
|
|
|
|
// Good! Adjust accounts
|
|
adjustByInputs(accounts, tx.Inputs)
|
|
for _, acc := range accounts {
|
|
blockCache.UpdateAccount(acc)
|
|
}
|
|
// Add ValidatorInfo
|
|
_s.SetValidatorInfo(&ValidatorInfo{
|
|
Address: tx.PubKey.Address(),
|
|
PubKey: tx.PubKey,
|
|
UnbondTo: tx.UnbondTo,
|
|
FirstBondHeight: _s.LastBlockHeight + 1,
|
|
FirstBondAmount: outTotal,
|
|
})
|
|
// Add Validator
|
|
added := _s.BondedValidators.Add(&Validator{
|
|
Address: tx.PubKey.Address(),
|
|
PubKey: tx.PubKey,
|
|
BondHeight: _s.LastBlockHeight + 1,
|
|
VotingPower: outTotal,
|
|
Accum: 0,
|
|
})
|
|
if !added {
|
|
panic("Failed to add validator")
|
|
}
|
|
if evc != nil {
|
|
evc.FireEvent(types.EventStringBond(), tx)
|
|
}
|
|
return nil
|
|
|
|
case *types.UnbondTx:
|
|
// The validator must be active
|
|
_, val := _s.BondedValidators.GetByAddress(tx.Address)
|
|
if val == nil {
|
|
return types.ErrTxInvalidAddress
|
|
}
|
|
|
|
// Verify the signature
|
|
signBytes := account.SignBytes(tx)
|
|
if !val.PubKey.VerifyBytes(signBytes, tx.Signature) {
|
|
return types.ErrTxInvalidSignature
|
|
}
|
|
|
|
// tx.Height must be greater than val.LastCommitHeight
|
|
if tx.Height <= val.LastCommitHeight {
|
|
return errors.New("Invalid unbond height")
|
|
}
|
|
|
|
// Good!
|
|
_s.unbondValidator(val)
|
|
if evc != nil {
|
|
evc.FireEvent(types.EventStringUnbond(), tx)
|
|
}
|
|
return nil
|
|
|
|
case *types.RebondTx:
|
|
// The validator must be inactive
|
|
_, val := _s.UnbondingValidators.GetByAddress(tx.Address)
|
|
if val == nil {
|
|
return types.ErrTxInvalidAddress
|
|
}
|
|
|
|
// Verify the signature
|
|
signBytes := account.SignBytes(tx)
|
|
if !val.PubKey.VerifyBytes(signBytes, tx.Signature) {
|
|
return types.ErrTxInvalidSignature
|
|
}
|
|
|
|
// tx.Height must be equal to the next height
|
|
if tx.Height != _s.LastBlockHeight+1 {
|
|
return errors.New(Fmt("Invalid rebond height. Expected %v, got %v", _s.LastBlockHeight+1, tx.Height))
|
|
}
|
|
|
|
// Good!
|
|
_s.rebondValidator(val)
|
|
if evc != nil {
|
|
evc.FireEvent(types.EventStringRebond(), tx)
|
|
}
|
|
return nil
|
|
|
|
case *types.DupeoutTx:
|
|
// Verify the signatures
|
|
_, accused := _s.BondedValidators.GetByAddress(tx.Address)
|
|
if accused == nil {
|
|
_, accused = _s.UnbondingValidators.GetByAddress(tx.Address)
|
|
if accused == nil {
|
|
return types.ErrTxInvalidAddress
|
|
}
|
|
}
|
|
voteASignBytes := account.SignBytes(&tx.VoteA)
|
|
voteBSignBytes := account.SignBytes(&tx.VoteB)
|
|
if !accused.PubKey.VerifyBytes(voteASignBytes, tx.VoteA.Signature) ||
|
|
!accused.PubKey.VerifyBytes(voteBSignBytes, tx.VoteB.Signature) {
|
|
return types.ErrTxInvalidSignature
|
|
}
|
|
|
|
// Verify equivocation
|
|
// TODO: in the future, just require one vote from a previous height that
|
|
// doesn't exist on this chain.
|
|
if tx.VoteA.Height != tx.VoteB.Height {
|
|
return errors.New("DupeoutTx heights don't match")
|
|
}
|
|
if tx.VoteA.Type == types.VoteTypeCommit && tx.VoteA.Round < tx.VoteB.Round {
|
|
// Check special case (not an error, validator must be slashed!)
|
|
// Validators should not sign another vote after committing.
|
|
} else if tx.VoteB.Type == types.VoteTypeCommit && tx.VoteB.Round < tx.VoteA.Round {
|
|
// We need to check both orderings of the votes
|
|
} else {
|
|
if tx.VoteA.Round != tx.VoteB.Round {
|
|
return errors.New("DupeoutTx rounds don't match")
|
|
}
|
|
if tx.VoteA.Type != tx.VoteB.Type {
|
|
return errors.New("DupeoutTx types don't match")
|
|
}
|
|
if bytes.Equal(tx.VoteA.BlockHash, tx.VoteB.BlockHash) {
|
|
return errors.New("DupeoutTx blockhashes shouldn't match")
|
|
}
|
|
}
|
|
|
|
// Good! (Bad validator!)
|
|
_s.destroyValidator(accused)
|
|
if evc != nil {
|
|
evc.FireEvent(types.EventStringDupeout(), tx)
|
|
}
|
|
return nil
|
|
|
|
default:
|
|
panic("Unknown Tx type")
|
|
}
|
|
}
|