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402 lines
14 KiB
402 lines
14 KiB
package state
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import (
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"fmt"
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fail "github.com/ebuchman/fail-test"
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abci "github.com/tendermint/tendermint/abci/types"
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dbm "github.com/tendermint/tendermint/libs/db"
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"github.com/tendermint/tendermint/libs/log"
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"github.com/tendermint/tendermint/proxy"
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"github.com/tendermint/tendermint/types"
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)
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//-----------------------------------------------------------------------------
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// BlockExecutor handles block execution and state updates.
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// It exposes ApplyBlock(), which validates & executes the block, updates state w/ ABCI responses,
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// then commits and updates the mempool atomically, then saves state.
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// BlockExecutor provides the context and accessories for properly executing a block.
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type BlockExecutor struct {
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// save state, validators, consensus params, abci responses here
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db dbm.DB
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// execute the app against this
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proxyApp proxy.AppConnConsensus
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// events
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eventBus types.BlockEventPublisher
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// update these with block results after commit
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mempool Mempool
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evpool EvidencePool
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logger log.Logger
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}
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// NewBlockExecutor returns a new BlockExecutor with a NopEventBus.
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// Call SetEventBus to provide one.
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func NewBlockExecutor(db dbm.DB, logger log.Logger, proxyApp proxy.AppConnConsensus,
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mempool Mempool, evpool EvidencePool) *BlockExecutor {
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return &BlockExecutor{
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db: db,
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proxyApp: proxyApp,
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eventBus: types.NopEventBus{},
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mempool: mempool,
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evpool: evpool,
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logger: logger,
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}
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}
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// SetEventBus - sets the event bus for publishing block related events.
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// If not called, it defaults to types.NopEventBus.
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func (blockExec *BlockExecutor) SetEventBus(eventBus types.BlockEventPublisher) {
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blockExec.eventBus = eventBus
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}
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// ValidateBlock validates the given block against the given state.
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// If the block is invalid, it returns an error.
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// Validation does not mutate state, but does require historical information from the stateDB,
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// ie. to verify evidence from a validator at an old height.
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func (blockExec *BlockExecutor) ValidateBlock(state State, block *types.Block) error {
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return validateBlock(blockExec.db, state, block)
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}
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// ApplyBlock validates the block against the state, executes it against the app,
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// fires the relevant events, commits the app, and saves the new state and responses.
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// It's the only function that needs to be called
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// from outside this package to process and commit an entire block.
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// It takes a blockID to avoid recomputing the parts hash.
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func (blockExec *BlockExecutor) ApplyBlock(state State, blockID types.BlockID, block *types.Block) (State, error) {
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if err := blockExec.ValidateBlock(state, block); err != nil {
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return state, ErrInvalidBlock(err)
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}
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abciResponses, err := execBlockOnProxyApp(blockExec.logger, blockExec.proxyApp, block, state.LastValidators, blockExec.db)
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if err != nil {
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return state, ErrProxyAppConn(err)
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}
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fail.Fail() // XXX
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// save the results before we commit
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saveABCIResponses(blockExec.db, block.Height, abciResponses)
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fail.Fail() // XXX
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// update the state with the block and responses
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state, err = updateState(state, blockID, &block.Header, abciResponses)
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if err != nil {
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return state, fmt.Errorf("Commit failed for application: %v", err)
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}
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// lock mempool, commit app state, update mempoool
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appHash, err := blockExec.Commit(block)
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if err != nil {
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return state, fmt.Errorf("Commit failed for application: %v", err)
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}
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// Update evpool with the block and state.
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blockExec.evpool.Update(block, state)
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fail.Fail() // XXX
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// update the app hash and save the state
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state.AppHash = appHash
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SaveState(blockExec.db, state)
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fail.Fail() // XXX
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// events are fired after everything else
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// NOTE: if we crash between Commit and Save, events wont be fired during replay
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fireEvents(blockExec.logger, blockExec.eventBus, block, abciResponses)
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return state, nil
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}
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// Commit locks the mempool, runs the ABCI Commit message, and updates the mempool.
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// It returns the result of calling abci.Commit (the AppHash), and an error.
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// The Mempool must be locked during commit and update because state is typically reset on Commit and old txs must be replayed
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// against committed state before new txs are run in the mempool, lest they be invalid.
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func (blockExec *BlockExecutor) Commit(block *types.Block) ([]byte, error) {
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blockExec.mempool.Lock()
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defer blockExec.mempool.Unlock()
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// while mempool is Locked, flush to ensure all async requests have completed
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// in the ABCI app before Commit.
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err := blockExec.mempool.FlushAppConn()
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if err != nil {
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blockExec.logger.Error("Client error during mempool.FlushAppConn", "err", err)
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return nil, err
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}
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// Commit block, get hash back
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res, err := blockExec.proxyApp.CommitSync()
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if err != nil {
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blockExec.logger.Error("Client error during proxyAppConn.CommitSync", "err", err)
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return nil, err
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}
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// ResponseCommit has no error code - just data
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blockExec.logger.Info("Committed state",
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"height", block.Height,
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"txs", block.NumTxs,
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"appHash", fmt.Sprintf("%X", res.Data))
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// Update mempool.
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if err := blockExec.mempool.Update(block.Height, block.Txs); err != nil {
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return nil, err
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}
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return res.Data, nil
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}
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//---------------------------------------------------------
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// Helper functions for executing blocks and updating state
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// Executes block's transactions on proxyAppConn.
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// Returns a list of transaction results and updates to the validator set
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func execBlockOnProxyApp(logger log.Logger, proxyAppConn proxy.AppConnConsensus,
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block *types.Block, lastValSet *types.ValidatorSet, stateDB dbm.DB) (*ABCIResponses, error) {
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var validTxs, invalidTxs = 0, 0
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txIndex := 0
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abciResponses := NewABCIResponses(block)
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// Execute transactions and get hash
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proxyCb := func(req *abci.Request, res *abci.Response) {
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switch r := res.Value.(type) {
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case *abci.Response_DeliverTx:
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// TODO: make use of res.Log
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// TODO: make use of this info
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// Blocks may include invalid txs.
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txRes := r.DeliverTx
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if txRes.Code == abci.CodeTypeOK {
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validTxs++
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} else {
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logger.Debug("Invalid tx", "code", txRes.Code, "log", txRes.Log)
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invalidTxs++
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}
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abciResponses.DeliverTx[txIndex] = txRes
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txIndex++
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}
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}
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proxyAppConn.SetResponseCallback(proxyCb)
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signVals, byzVals := getBeginBlockValidatorInfo(block, lastValSet, stateDB)
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// Begin block
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_, err := proxyAppConn.BeginBlockSync(abci.RequestBeginBlock{
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Hash: block.Hash(),
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Header: types.TM2PB.Header(&block.Header),
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Validators: signVals,
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ByzantineValidators: byzVals,
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})
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if err != nil {
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logger.Error("Error in proxyAppConn.BeginBlock", "err", err)
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return nil, err
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}
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// Run txs of block
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for _, tx := range block.Txs {
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proxyAppConn.DeliverTxAsync(tx)
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if err := proxyAppConn.Error(); err != nil {
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return nil, err
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}
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}
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// End block
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abciResponses.EndBlock, err = proxyAppConn.EndBlockSync(abci.RequestEndBlock{block.Height})
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if err != nil {
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logger.Error("Error in proxyAppConn.EndBlock", "err", err)
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return nil, err
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}
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logger.Info("Executed block", "height", block.Height, "validTxs", validTxs, "invalidTxs", invalidTxs)
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valUpdates := abciResponses.EndBlock.ValidatorUpdates
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if len(valUpdates) > 0 {
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logger.Info("Updates to validators", "updates", abci.ValidatorsString(valUpdates))
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}
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return abciResponses, nil
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}
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func getBeginBlockValidatorInfo(block *types.Block, lastValSet *types.ValidatorSet, stateDB dbm.DB) ([]abci.SigningValidator, []abci.Evidence) {
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// Sanity check that commit length matches validator set size -
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// only applies after first block
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if block.Height > 1 {
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precommitLen := len(block.LastCommit.Precommits)
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valSetLen := len(lastValSet.Validators)
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if precommitLen != valSetLen {
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// sanity check
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panic(fmt.Sprintf("precommit length (%d) doesn't match valset length (%d) at height %d\n\n%v\n\n%v",
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precommitLen, valSetLen, block.Height, block.LastCommit.Precommits, lastValSet.Validators))
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}
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}
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// determine which validators did not sign last block.
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signVals := make([]abci.SigningValidator, len(lastValSet.Validators))
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for i, val := range lastValSet.Validators {
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var vote *types.Vote
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if i < len(block.LastCommit.Precommits) {
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vote = block.LastCommit.Precommits[i]
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}
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val := abci.SigningValidator{
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Validator: types.TM2PB.Validator(val),
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SignedLastBlock: vote != nil,
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}
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signVals[i] = val
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}
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byzVals := make([]abci.Evidence, len(block.Evidence.Evidence))
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for i, ev := range block.Evidence.Evidence {
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// We need the validator set. We already did this in validateBlock.
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// TODO: Should we instead cache the valset in the evidence itself and add
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// `SetValidatorSet()` and `ToABCI` methods ?
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valset, err := LoadValidators(stateDB, ev.Height())
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if err != nil {
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panic(err) // shouldn't happen
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}
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byzVals[i] = types.TM2PB.Evidence(ev, valset, block.Time)
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}
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return signVals, byzVals
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}
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// If more or equal than 1/3 of total voting power changed in one block, then
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// a light client could never prove the transition externally. See
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// ./lite/doc.go for details on how a light client tracks validators.
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func updateValidators(currentSet *types.ValidatorSet, abciUpdates []abci.Validator) error {
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updates, err := types.PB2TM.Validators(abciUpdates)
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if err != nil {
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return err
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}
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// these are tendermint types now
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for _, valUpdate := range updates {
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if valUpdate.VotingPower < 0 {
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return fmt.Errorf("Voting power can't be negative %v", valUpdate)
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}
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address := valUpdate.Address
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_, val := currentSet.GetByAddress(address)
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if valUpdate.VotingPower == 0 {
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// remove val
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_, removed := currentSet.Remove(address)
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if !removed {
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return fmt.Errorf("Failed to remove validator %X", address)
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}
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} else if val == nil {
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// add val
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added := currentSet.Add(valUpdate)
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if !added {
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return fmt.Errorf("Failed to add new validator %v", valUpdate)
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}
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} else {
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// update val
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updated := currentSet.Update(valUpdate)
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if !updated {
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return fmt.Errorf("Failed to update validator %X to %v", address, valUpdate)
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}
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}
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}
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return nil
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}
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// updateState returns a new State updated according to the header and responses.
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func updateState(state State, blockID types.BlockID, header *types.Header,
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abciResponses *ABCIResponses) (State, error) {
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// copy the valset so we can apply changes from EndBlock
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// and update s.LastValidators and s.Validators
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prevValSet := state.Validators.Copy()
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nextValSet := prevValSet.Copy()
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// update the validator set with the latest abciResponses
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lastHeightValsChanged := state.LastHeightValidatorsChanged
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if len(abciResponses.EndBlock.ValidatorUpdates) > 0 {
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err := updateValidators(nextValSet, abciResponses.EndBlock.ValidatorUpdates)
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if err != nil {
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return state, fmt.Errorf("Error changing validator set: %v", err)
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}
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// change results from this height but only applies to the next height
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lastHeightValsChanged = header.Height + 1
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}
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// Update validator accums and set state variables
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nextValSet.IncrementAccum(1)
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// update the params with the latest abciResponses
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nextParams := state.ConsensusParams
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lastHeightParamsChanged := state.LastHeightConsensusParamsChanged
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if abciResponses.EndBlock.ConsensusParamUpdates != nil {
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// NOTE: must not mutate s.ConsensusParams
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nextParams = state.ConsensusParams.Update(abciResponses.EndBlock.ConsensusParamUpdates)
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err := nextParams.Validate()
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if err != nil {
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return state, fmt.Errorf("Error updating consensus params: %v", err)
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}
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// change results from this height but only applies to the next height
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lastHeightParamsChanged = header.Height + 1
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}
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// NOTE: the AppHash has not been populated.
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// It will be filled on state.Save.
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return State{
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ChainID: state.ChainID,
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LastBlockHeight: header.Height,
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LastBlockTotalTx: state.LastBlockTotalTx + header.NumTxs,
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LastBlockID: blockID,
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LastBlockTime: header.Time,
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Validators: nextValSet,
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LastValidators: state.Validators.Copy(),
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LastHeightValidatorsChanged: lastHeightValsChanged,
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ConsensusParams: nextParams,
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LastHeightConsensusParamsChanged: lastHeightParamsChanged,
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LastResultsHash: abciResponses.ResultsHash(),
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AppHash: nil,
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}, nil
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}
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// Fire NewBlock, NewBlockHeader.
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// Fire TxEvent for every tx.
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// NOTE: if Tendermint crashes before commit, some or all of these events may be published again.
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func fireEvents(logger log.Logger, eventBus types.BlockEventPublisher, block *types.Block, abciResponses *ABCIResponses) {
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eventBus.PublishEventNewBlock(types.EventDataNewBlock{block})
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eventBus.PublishEventNewBlockHeader(types.EventDataNewBlockHeader{block.Header})
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for i, tx := range block.Data.Txs {
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eventBus.PublishEventTx(types.EventDataTx{types.TxResult{
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Height: block.Height,
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Index: uint32(i),
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Tx: tx,
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Result: *(abciResponses.DeliverTx[i]),
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}})
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}
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}
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//----------------------------------------------------------------------------------------------------
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// Execute block without state. TODO: eliminate
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// ExecCommitBlock executes and commits a block on the proxyApp without validating or mutating the state.
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// It returns the application root hash (result of abci.Commit).
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func ExecCommitBlock(appConnConsensus proxy.AppConnConsensus, block *types.Block,
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logger log.Logger, lastValSet *types.ValidatorSet, stateDB dbm.DB) ([]byte, error) {
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_, err := execBlockOnProxyApp(logger, appConnConsensus, block, lastValSet, stateDB)
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if err != nil {
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logger.Error("Error executing block on proxy app", "height", block.Height, "err", err)
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return nil, err
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}
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// Commit block, get hash back
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res, err := appConnConsensus.CommitSync()
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if err != nil {
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logger.Error("Client error during proxyAppConn.CommitSync", "err", res)
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return nil, err
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}
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// ResponseCommit has no error or log, just data
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return res.Data, nil
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}
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