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package state
import (
"bytes"
"errors"
"fmt"
fail "github.com/ebuchman/fail-test"
abci "github.com/tendermint/abci/types"
crypto "github.com/tendermint/go-crypto"
"github.com/tendermint/tendermint/proxy"
"github.com/tendermint/tendermint/types"
"github.com/tendermint/tmlibs/log"
)
//--------------------------------------------------
// Execute the block
// ValExecBlock executes the block, but does NOT mutate State.
// + validates the block
// + executes block.Txs on the proxyAppConn
func (s *State) ValExecBlock(txEventPublisher types.TxEventPublisher, proxyAppConn proxy.AppConnConsensus, block *types.Block) (*ABCIResponses, error) {
// Validate the block.
if err := s.validateBlock(block); err != nil {
return nil, ErrInvalidBlock(err)
}
// Execute the block txs
abciResponses, err := execBlockOnProxyApp(txEventPublisher, proxyAppConn, block, s.logger, s.LastValidators)
if err != nil {
// There was some error in proxyApp
// TODO Report error and wait for proxyApp to be available.
return nil, ErrProxyAppConn(err)
}
return abciResponses, nil
}
// Executes block's transactions on proxyAppConn.
// Returns a list of transaction results and updates to the validator set
// TODO: Generate a bitmap or otherwise store tx validity in state.
func execBlockOnProxyApp(txEventPublisher types.TxEventPublisher, proxyAppConn proxy.AppConnConsensus, block *types.Block, logger log.Logger, lastValidators *types.ValidatorSet) (*ABCIResponses, error) {
var validTxs, invalidTxs = 0, 0
txIndex := 0
abciResponses := NewABCIResponses(block)
// Execute transactions and get hash
proxyCb := func(req *abci.Request, res *abci.Response) {
switch r := res.Value.(type) {
case *abci.Response_DeliverTx:
// TODO: make use of res.Log
// TODO: make use of this info
// Blocks may include invalid txs.
txRes := r.DeliverTx
if txRes.Code == abci.CodeTypeOK {
validTxs++
} else {
logger.Debug("Invalid tx", "code", txRes.Code, "log", txRes.Log)
invalidTxs++
}
// NOTE: if we count we can access the tx from the block instead of
// pulling it from the req
tx := types.Tx(req.GetDeliverTx().Tx)
txEventPublisher.PublishEventTx(types.EventDataTx{types.TxResult{
Height: block.Height,
Index: uint32(txIndex),
Tx: tx,
Result: *txRes,
}})
abciResponses.DeliverTx[txIndex] = txRes
txIndex++
}
}
proxyAppConn.SetResponseCallback(proxyCb)
// determine which validators did not sign last block
absentVals := make([]int32, 0)
for valI, vote := range block.LastCommit.Precommits {
if vote == nil {
absentVals = append(absentVals, int32(valI))
}
}
// TODO: determine which validators were byzantine
// Begin block
_, err := proxyAppConn.BeginBlockSync(abci.RequestBeginBlock{
Hash: block.Hash(),
Header: types.TM2PB.Header(block.Header),
AbsentValidators: absentVals,
ByzantineValidators: nil,
})
if err != nil {
logger.Error("Error in proxyAppConn.BeginBlock", "err", err)
return nil, err
}
// Run txs of block
for _, tx := range block.Txs {
proxyAppConn.DeliverTxAsync(tx)
if err := proxyAppConn.Error(); err != nil {
return nil, err
}
}
// End block
abciResponses.EndBlock, err = proxyAppConn.EndBlockSync(abci.RequestEndBlock{block.Height})
if err != nil {
logger.Error("Error in proxyAppConn.EndBlock", "err", err)
return nil, err
}
logger.Info("Executed block", "height", block.Height, "validTxs", validTxs, "invalidTxs", invalidTxs)
valUpdates := abciResponses.EndBlock.ValidatorUpdates
if len(valUpdates) > 0 {
logger.Info("Updates to validators", "updates", abci.ValidatorsString(valUpdates))
}
return abciResponses, nil
}
func updateValidators(currentSet *types.ValidatorSet, updates []*abci.Validator) error {
// If more or equal than 1/3 of total voting power changed in one block, then
// a light client could never prove the transition externally. See
// ./lite/doc.go for details on how a light client tracks validators.
vp23, err := changeInVotingPowerMoreOrEqualToOneThird(currentSet, updates)
if err != nil {
return err
}
if vp23 {
return errors.New("the change in voting power must be strictly less than 1/3")
}
for _, v := range updates {
pubkey, err := crypto.PubKeyFromBytes(v.PubKey) // NOTE: expects go-wire encoded pubkey
if err != nil {
return err
}
address := pubkey.Address()
power := int64(v.Power)
// mind the overflow from int64
if power < 0 {
return fmt.Errorf("Power (%d) overflows int64", v.Power)
}
_, val := currentSet.GetByAddress(address)
if val == nil {
// add val
added := currentSet.Add(types.NewValidator(pubkey, power))
if !added {
return fmt.Errorf("Failed to add new validator %X with voting power %d", address, power)
}
} else if v.Power == 0 {
// remove val
_, removed := currentSet.Remove(address)
if !removed {
return fmt.Errorf("Failed to remove validator %X", address)
}
} else {
// update val
val.VotingPower = power
updated := currentSet.Update(val)
if !updated {
return fmt.Errorf("Failed to update validator %X with voting power %d", address, power)
}
}
}
return nil
}
func changeInVotingPowerMoreOrEqualToOneThird(currentSet *types.ValidatorSet, updates []*abci.Validator) (bool, error) {
threshold := currentSet.TotalVotingPower() * 1 / 3
acc := int64(0)
for _, v := range updates {
pubkey, err := crypto.PubKeyFromBytes(v.PubKey) // NOTE: expects go-wire encoded pubkey
if err != nil {
return false, err
}
address := pubkey.Address()
power := int64(v.Power)
// mind the overflow from int64
if power < 0 {
return false, fmt.Errorf("Power (%d) overflows int64", v.Power)
}
_, val := currentSet.GetByAddress(address)
if val == nil {
acc += power
} else {
np := val.VotingPower - power
if np < 0 {
np = -np
}
acc += np
}
if acc >= threshold {
return true, nil
}
}
return false, nil
}
// return a bit array of validators that signed the last commit
// NOTE: assumes commits have already been authenticated
/* function is currently unused
func commitBitArrayFromBlock(block *types.Block) *cmn.BitArray {
signed := cmn.NewBitArray(len(block.LastCommit.Precommits))
for i, precommit := range block.LastCommit.Precommits {
if precommit != nil {
signed.SetIndex(i, true) // val_.LastCommitHeight = block.Height - 1
}
}
return signed
}
*/
//-----------------------------------------------------
// Validate block
// ValidateBlock validates the block against the state.
func (s *State) ValidateBlock(block *types.Block) error {
return s.validateBlock(block)
}
// MakeBlock builds a block with the given txs and commit from the current state.
func (s *State) MakeBlock(height int64, txs []types.Tx, commit *types.Commit) (*types.Block, *types.PartSet) {
// build base block
block := types.MakeBlock(height, txs, commit)
// fill header with state data
block.ChainID = s.ChainID
block.TotalTxs = s.LastBlockTotalTx + block.NumTxs
block.LastBlockID = s.LastBlockID
block.ValidatorsHash = s.Validators.Hash()
block.AppHash = s.AppHash
block.ConsensusHash = s.ConsensusParams.Hash()
block.LastResultsHash = s.LastResultsHash
return block, block.MakePartSet(s.ConsensusParams.BlockGossip.BlockPartSizeBytes)
}
func (s *State) validateBlock(b *types.Block) error {
// validate internal consistency
if err := b.ValidateBasic(); err != nil {
return err
}
// validate basic info
if b.ChainID != s.ChainID {
return fmt.Errorf("Wrong Block.Header.ChainID. Expected %v, got %v", s.ChainID, b.ChainID)
}
if b.Height != s.LastBlockHeight+1 {
return fmt.Errorf("Wrong Block.Header.Height. Expected %v, got %v", s.LastBlockHeight+1, b.Height)
}
/* TODO: Determine bounds for Time
See blockchain/reactor "stopSyncingDurationMinutes"
if !b.Time.After(lastBlockTime) {
return errors.New("Invalid Block.Header.Time")
}
*/
// validate prev block info
if !b.LastBlockID.Equals(s.LastBlockID) {
return fmt.Errorf("Wrong Block.Header.LastBlockID. Expected %v, got %v", s.LastBlockID, b.LastBlockID)
}
newTxs := int64(len(b.Data.Txs))
if b.TotalTxs != s.LastBlockTotalTx+newTxs {
return fmt.Errorf("Wrong Block.Header.TotalTxs. Expected %v, got %v", s.LastBlockTotalTx+newTxs, b.TotalTxs)
}
// validate app info
if !bytes.Equal(b.AppHash, s.AppHash) {
return fmt.Errorf("Wrong Block.Header.AppHash. Expected %X, got %v", s.AppHash, b.AppHash)
}
if !bytes.Equal(b.ConsensusHash, s.ConsensusParams.Hash()) {
return fmt.Errorf("Wrong Block.Header.ConsensusHash. Expected %X, got %v", s.ConsensusParams.Hash(), b.ConsensusHash)
}
if !bytes.Equal(b.LastResultsHash, s.LastResultsHash) {
return fmt.Errorf("Wrong Block.Header.LastResultsHash. Expected %X, got %v", s.LastResultsHash, b.LastResultsHash)
}
if !bytes.Equal(b.ValidatorsHash, s.Validators.Hash()) {
return fmt.Errorf("Wrong Block.Header.ValidatorsHash. Expected %X, got %v", s.Validators.Hash(), b.ValidatorsHash)
}
// Validate block LastCommit.
if b.Height == 1 {
if len(b.LastCommit.Precommits) != 0 {
return errors.New("Block at height 1 (first block) should have no LastCommit precommits")
}
} else {
if len(b.LastCommit.Precommits) != s.LastValidators.Size() {
return fmt.Errorf("Invalid block commit size. Expected %v, got %v",
s.LastValidators.Size(), len(b.LastCommit.Precommits))
}
err := s.LastValidators.VerifyCommit(
s.ChainID, s.LastBlockID, b.Height-1, b.LastCommit)
if err != nil {
return err
}
}
for _, ev := range block.Evidence.Evidence {
if _, err := s.VerifyEvidence(ev); err != nil {
return types.NewEvidenceInvalidErr(ev, err)
}
// TODO: mark evidence as committed
}
return nil
}
//-----------------------------------------------------------------------------
// ApplyBlock validates & executes the block, updates state w/ ABCI responses,
// then commits and updates the mempool atomically, then saves state.
// ApplyBlock validates the block against the state, executes it against the app,
// commits it, and saves the block and state. It's the only function that needs to be called
// from outside this package to process and commit an entire block.
func (s *State) ApplyBlock(txEventPublisher types.TxEventPublisher, proxyAppConn proxy.AppConnConsensus,
block *types.Block, partsHeader types.PartSetHeader,
mempool types.Mempool, evpool types.EvidencePool) error {
abciResponses, err := s.ValExecBlock(txEventPublisher, proxyAppConn, block)
if err != nil {
return fmt.Errorf("Exec failed for application: %v", err)
}
fail.Fail() // XXX
// save the results before we commit
s.SaveABCIResponses(block.Height, abciResponses)
fail.Fail() // XXX
// now update the block and validators
err = s.SetBlockAndValidators(block.Header, partsHeader, abciResponses)
if err != nil {
return fmt.Errorf("Commit failed for application: %v", err)
}
// lock mempool, commit state, update mempoool
err = s.CommitStateUpdateMempool(proxyAppConn, block, mempool)
if err != nil {
return fmt.Errorf("Commit failed for application: %v", err)
}
fail.Fail() // XXX
evpool.MarkEvidenceAsCommitted(block.Evidence.Evidence)
// save the state and the validators
s.Save()
return nil
}
// CommitStateUpdateMempool locks the mempool, runs the ABCI Commit message, and updates the mempool.
// The Mempool must be locked during commit and update because state is typically reset on Commit and old txs must be replayed
// against committed state before new txs are run in the mempool, lest they be invalid.
func (s *State) CommitStateUpdateMempool(proxyAppConn proxy.AppConnConsensus, block *types.Block, mempool types.Mempool) error {
mempool.Lock()
defer mempool.Unlock()
// Commit block, get hash back
res, err := proxyAppConn.CommitSync()
if err != nil {
s.logger.Error("Client error during proxyAppConn.CommitSync", "err", err)
return err
}
if res.IsErr() {
s.logger.Error("Error in proxyAppConn.CommitSync", "err", res)
return res
}
if res.Log != "" {
s.logger.Debug("Commit.Log: " + res.Log)
}
s.logger.Info("Committed state", "height", block.Height, "txs", block.NumTxs, "hash", res.Data)
// Set the state's new AppHash
s.AppHash = res.Data
// Update mempool.
return mempool.Update(block.Height, block.Txs)
}
// ExecCommitBlock executes and commits a block on the proxyApp without validating or mutating the state.
// It returns the application root hash (result of abci.Commit).
func ExecCommitBlock(appConnConsensus proxy.AppConnConsensus, block *types.Block, logger log.Logger, lastValidators *types.ValidatorSet) ([]byte, error) {
_, err := execBlockOnProxyApp(types.NopEventBus{}, appConnConsensus, block, logger, lastValidators)
if err != nil {
logger.Error("Error executing block on proxy app", "height", block.Height, "err", err)
return nil, err
}
// Commit block, get hash back
res, err := appConnConsensus.CommitSync()
if err != nil {
logger.Error("Client error during proxyAppConn.CommitSync", "err", res)
return nil, err
}
if res.IsErr() {
logger.Error("Error in proxyAppConn.CommitSync", "err", res)
return nil, res
}
if res.Log != "" {
logger.Info("Commit.Log: " + res.Log)
}
return res.Data, nil
}