You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
379 lines
13 KiB
379 lines
13 KiB
package state
|
|
|
|
import (
|
|
"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"
|
|
dbm "github.com/tendermint/tmlibs/db"
|
|
"github.com/tendermint/tmlibs/log"
|
|
)
|
|
|
|
//-----------------------------------------------------------------------------
|
|
// BlockExecutor handles block execution and state updates.
|
|
// It exposes ApplyBlock(), which validates & executes the block, updates state w/ ABCI responses,
|
|
// then commits and updates the mempool atomically, then saves state.
|
|
|
|
// BlockExecutor provides the context and accessories for properly executing a block.
|
|
type BlockExecutor struct {
|
|
// save state, validators, consensus params, abci responses here
|
|
db dbm.DB
|
|
|
|
// execute the app against this
|
|
proxyApp proxy.AppConnConsensus
|
|
|
|
// events
|
|
eventBus types.BlockEventPublisher
|
|
|
|
// update these with block results after commit
|
|
mempool types.Mempool
|
|
evpool types.EvidencePool
|
|
|
|
logger log.Logger
|
|
}
|
|
|
|
// NewBlockExecutor returns a new BlockExecutor with a NopEventBus.
|
|
// Call SetEventBus to provide one.
|
|
func NewBlockExecutor(db dbm.DB, logger log.Logger, proxyApp proxy.AppConnConsensus,
|
|
mempool types.Mempool, evpool types.EvidencePool) *BlockExecutor {
|
|
return &BlockExecutor{
|
|
db: db,
|
|
proxyApp: proxyApp,
|
|
eventBus: types.NopEventBus{},
|
|
mempool: mempool,
|
|
evpool: evpool,
|
|
logger: logger,
|
|
}
|
|
}
|
|
|
|
// SetEventBus - sets the event bus for publishing block related events.
|
|
// If not called, it defaults to types.NopEventBus.
|
|
func (blockExec *BlockExecutor) SetEventBus(eventBus types.BlockEventPublisher) {
|
|
blockExec.eventBus = eventBus
|
|
}
|
|
|
|
// ValidateBlock validates the given block against the given state.
|
|
// If the block is invalid, it returns an error.
|
|
// Validation does not mutate state, but does require historical information from the stateDB,
|
|
// ie. to verify evidence from a validator at an old height.
|
|
func (blockExec *BlockExecutor) ValidateBlock(s State, block *types.Block) error {
|
|
return validateBlock(blockExec.db, s, block)
|
|
}
|
|
|
|
// ApplyBlock validates the block against the state, executes it against the app,
|
|
// fires the relevant events, commits the app, and saves the new state and responses.
|
|
// It's the only function that needs to be called
|
|
// from outside this package to process and commit an entire block.
|
|
// It takes a blockID to avoid recomputing the parts hash.
|
|
func (blockExec *BlockExecutor) ApplyBlock(s State, blockID types.BlockID, block *types.Block) (State, error) {
|
|
|
|
if err := blockExec.ValidateBlock(s, block); err != nil {
|
|
return s, ErrInvalidBlock(err)
|
|
}
|
|
|
|
abciResponses, err := execBlockOnProxyApp(blockExec.logger, blockExec.proxyApp, block)
|
|
if err != nil {
|
|
return s, ErrProxyAppConn(err)
|
|
}
|
|
|
|
fail.Fail() // XXX
|
|
|
|
// save the results before we commit
|
|
saveABCIResponses(blockExec.db, block.Height, abciResponses)
|
|
|
|
fail.Fail() // XXX
|
|
|
|
// update the state with the block and responses
|
|
s, err = updateState(s, blockID, block.Header, abciResponses)
|
|
if err != nil {
|
|
return s, fmt.Errorf("Commit failed for application: %v", err)
|
|
}
|
|
|
|
// lock mempool, commit state, update mempoool
|
|
appHash, err := blockExec.Commit(block)
|
|
if err != nil {
|
|
return s, fmt.Errorf("Commit failed for application: %v", err)
|
|
}
|
|
|
|
fail.Fail() // XXX
|
|
|
|
// update the app hash and save the state
|
|
s.AppHash = appHash
|
|
SaveState(blockExec.db, s)
|
|
|
|
fail.Fail() // XXX
|
|
|
|
// Update evpool now that state is saved
|
|
// TODO: handle the crash/recover scenario
|
|
// ie. (may need to call Update for last block)
|
|
blockExec.evpool.Update(block)
|
|
|
|
// events are fired after everything else
|
|
// NOTE: if we crash between Commit and Save, events wont be fired during replay
|
|
fireEvents(blockExec.logger, blockExec.eventBus, block, abciResponses)
|
|
|
|
return s, nil
|
|
}
|
|
|
|
// Commit locks the mempool, runs the ABCI Commit message, and updates the mempool.
|
|
// It returns the result of calling abci.Commit (the AppHash), and an error.
|
|
// 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 (blockExec *BlockExecutor) Commit(block *types.Block) ([]byte, error) {
|
|
blockExec.mempool.Lock()
|
|
defer blockExec.mempool.Unlock()
|
|
|
|
// while mempool is Locked, flush to ensure all async requests have completed
|
|
// in the ABCI app before Commit.
|
|
err := blockExec.mempool.FlushAppConn()
|
|
if err != nil {
|
|
blockExec.logger.Error("Client error during mempool.FlushAppConn", "err", err)
|
|
return nil, err
|
|
}
|
|
|
|
// Commit block, get hash back
|
|
res, err := blockExec.proxyApp.CommitSync()
|
|
if err != nil {
|
|
blockExec.logger.Error("Client error during proxyAppConn.CommitSync", "err", err)
|
|
return nil, err
|
|
}
|
|
// ResponseCommit has no error code - just data
|
|
|
|
blockExec.logger.Info("Committed state", "height", block.Height, "txs", block.NumTxs, "appHash", res.Data)
|
|
|
|
// Update mempool.
|
|
if err := blockExec.mempool.Update(block.Height, block.Txs); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return res.Data, nil
|
|
}
|
|
|
|
//---------------------------------------------------------
|
|
// Helper functions for executing blocks and updating state
|
|
|
|
// Executes block's transactions on proxyAppConn.
|
|
// Returns a list of transaction results and updates to the validator set
|
|
func execBlockOnProxyApp(logger log.Logger, proxyAppConn proxy.AppConnConsensus, block *types.Block) (*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++
|
|
}
|
|
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
|
|
byzantineVals := make([]abci.Evidence, len(block.Evidence.Evidence))
|
|
for i, ev := range block.Evidence.Evidence {
|
|
byzantineVals[i] = abci.Evidence{
|
|
PubKey: ev.Address(), // XXX
|
|
Height: ev.Height(),
|
|
}
|
|
}
|
|
|
|
// Begin block
|
|
_, err := proxyAppConn.BeginBlockSync(abci.RequestBeginBlock{
|
|
Hash: block.Hash(),
|
|
Header: types.TM2PB.Header(block.Header),
|
|
AbsentValidators: absentVals,
|
|
ByzantineValidators: byzantineVals,
|
|
})
|
|
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
|
|
}
|
|
|
|
// 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.
|
|
func updateValidators(currentSet *types.ValidatorSet, updates []abci.Validator) error {
|
|
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
|
|
}
|
|
|
|
// updateState returns a new State updated according to the header and responses.
|
|
func updateState(s State, blockID types.BlockID, header *types.Header,
|
|
abciResponses *ABCIResponses) (State, error) {
|
|
|
|
// copy the valset so we can apply changes from EndBlock
|
|
// and update s.LastValidators and s.Validators
|
|
prevValSet := s.Validators.Copy()
|
|
nextValSet := prevValSet.Copy()
|
|
|
|
// update the validator set with the latest abciResponses
|
|
lastHeightValsChanged := s.LastHeightValidatorsChanged
|
|
if len(abciResponses.EndBlock.ValidatorUpdates) > 0 {
|
|
err := updateValidators(nextValSet, abciResponses.EndBlock.ValidatorUpdates)
|
|
if err != nil {
|
|
return s, fmt.Errorf("Error changing validator set: %v", err)
|
|
}
|
|
// change results from this height but only applies to the next height
|
|
lastHeightValsChanged = header.Height + 1
|
|
}
|
|
|
|
// Update validator accums and set state variables
|
|
nextValSet.IncrementAccum(1)
|
|
|
|
// update the params with the latest abciResponses
|
|
nextParams := s.ConsensusParams
|
|
lastHeightParamsChanged := s.LastHeightConsensusParamsChanged
|
|
if abciResponses.EndBlock.ConsensusParamUpdates != nil {
|
|
// NOTE: must not mutate s.ConsensusParams
|
|
nextParams = s.ConsensusParams.Update(abciResponses.EndBlock.ConsensusParamUpdates)
|
|
err := nextParams.Validate()
|
|
if err != nil {
|
|
return s, fmt.Errorf("Error updating consensus params: %v", err)
|
|
}
|
|
// change results from this height but only applies to the next height
|
|
lastHeightParamsChanged = header.Height + 1
|
|
}
|
|
|
|
// NOTE: the AppHash has not been populated.
|
|
// It will be filled on state.Save.
|
|
return State{
|
|
ChainID: s.ChainID,
|
|
LastBlockHeight: header.Height,
|
|
LastBlockTotalTx: s.LastBlockTotalTx + header.NumTxs,
|
|
LastBlockID: blockID,
|
|
LastBlockTime: header.Time,
|
|
Validators: nextValSet,
|
|
LastValidators: s.Validators.Copy(),
|
|
LastHeightValidatorsChanged: lastHeightValsChanged,
|
|
ConsensusParams: nextParams,
|
|
LastHeightConsensusParamsChanged: lastHeightParamsChanged,
|
|
LastResultsHash: abciResponses.ResultsHash(),
|
|
AppHash: nil,
|
|
}, nil
|
|
}
|
|
|
|
// Fire NewBlock, NewBlockHeader.
|
|
// Fire TxEvent for every tx.
|
|
// NOTE: if Tendermint crashes before commit, some or all of these events may be published again.
|
|
func fireEvents(logger log.Logger, eventBus types.BlockEventPublisher, block *types.Block, abciResponses *ABCIResponses) {
|
|
// NOTE: do we still need this buffer ?
|
|
txEventBuffer := types.NewTxEventBuffer(eventBus, int(block.NumTxs))
|
|
for i, tx := range block.Data.Txs {
|
|
txEventBuffer.PublishEventTx(types.EventDataTx{types.TxResult{
|
|
Height: block.Height,
|
|
Index: uint32(i),
|
|
Tx: tx,
|
|
Result: *(abciResponses.DeliverTx[i]),
|
|
}})
|
|
}
|
|
|
|
eventBus.PublishEventNewBlock(types.EventDataNewBlock{block})
|
|
eventBus.PublishEventNewBlockHeader(types.EventDataNewBlockHeader{block.Header})
|
|
err := txEventBuffer.Flush()
|
|
if err != nil {
|
|
logger.Error("Failed to flush event buffer", "err", err)
|
|
}
|
|
}
|
|
|
|
//----------------------------------------------------------------------------------------------------
|
|
// Execute block without state. TODO: eliminate
|
|
|
|
// 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) ([]byte, error) {
|
|
_, err := execBlockOnProxyApp(logger, appConnConsensus, block)
|
|
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
|
|
}
|
|
// ResponseCommit has no error or log, just data
|
|
return res.Data, nil
|
|
}
|