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521 lines
17 KiB
521 lines
17 KiB
package state
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import (
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"errors"
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"fmt"
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"time"
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dbm "github.com/tendermint/tm-db"
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abci "github.com/tendermint/tendermint/abci/types"
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cryptoenc "github.com/tendermint/tendermint/crypto/encoding"
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"github.com/tendermint/tendermint/libs/fail"
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"github.com/tendermint/tendermint/libs/log"
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mempl "github.com/tendermint/tendermint/mempool"
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tmstate "github.com/tendermint/tendermint/proto/state"
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tmproto "github.com/tendermint/tendermint/proto/types"
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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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// manage the mempool lock during commit
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// and update both with block results after commit.
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mempool mempl.Mempool
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evpool EvidencePool
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logger log.Logger
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metrics *Metrics
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}
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type BlockExecutorOption func(executor *BlockExecutor)
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func BlockExecutorWithMetrics(metrics *Metrics) BlockExecutorOption {
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return func(blockExec *BlockExecutor) {
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blockExec.metrics = metrics
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}
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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(
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db dbm.DB,
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logger log.Logger,
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proxyApp proxy.AppConnConsensus,
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mempool mempl.Mempool,
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evpool EvidencePool,
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options ...BlockExecutorOption,
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) *BlockExecutor {
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res := &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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metrics: NopMetrics(),
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}
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for _, option := range options {
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option(res)
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}
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return res
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}
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func (blockExec *BlockExecutor) DB() dbm.DB {
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return blockExec.db
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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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// CreateProposalBlock calls state.MakeBlock with evidence from the evpool
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// and txs from the mempool. The max bytes must be big enough to fit the commit.
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// Up to 1/10th of the block space is allcoated for maximum sized evidence.
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// The rest is given to txs, up to the max gas.
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func (blockExec *BlockExecutor) CreateProposalBlock(
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height int64,
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state State, commit *types.Commit,
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proposerAddr []byte,
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) (*types.Block, *types.PartSet) {
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maxBytes := state.ConsensusParams.Block.MaxBytes
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maxGas := state.ConsensusParams.Block.MaxGas
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evidence := blockExec.evpool.PendingEvidence(state.ConsensusParams.Evidence.MaxNum)
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// Fetch a limited amount of valid txs
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maxDataBytes := types.MaxDataBytes(maxBytes, state.Validators.Size(), len(evidence))
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txs := blockExec.mempool.ReapMaxBytesMaxGas(maxDataBytes, maxGas)
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return state.MakeBlock(height, txs, commit, evidence, proposerAddr)
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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.evpool, 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 returns the new state and the block height to retain (pruning older blocks).
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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(
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state State, blockID types.BlockID, block *types.Block,
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) (State, int64, error) {
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if err := blockExec.ValidateBlock(state, block); err != nil {
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return state, 0, ErrInvalidBlock(err)
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}
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startTime := time.Now().UnixNano()
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abciResponses, err := execBlockOnProxyApp(blockExec.logger, blockExec.proxyApp, block, blockExec.db)
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endTime := time.Now().UnixNano()
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blockExec.metrics.BlockProcessingTime.Observe(float64(endTime-startTime) / 1000000)
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if err != nil {
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return state, 0, 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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// validate the validator updates and convert to tendermint types
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abciValUpdates := abciResponses.EndBlock.ValidatorUpdates
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err = validateValidatorUpdates(abciValUpdates, state.ConsensusParams.Validator)
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if err != nil {
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return state, 0, fmt.Errorf("error in validator updates: %v", err)
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}
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validatorUpdates, err := types.PB2TM.ValidatorUpdates(abciValUpdates)
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if err != nil {
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return state, 0, err
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}
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if len(validatorUpdates) > 0 {
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blockExec.logger.Info("Updates to validators", "updates", types.ValidatorListString(validatorUpdates))
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}
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// Update the state with the block and responses.
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state, err = updateState(state, blockID, &block.Header, abciResponses, validatorUpdates)
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if err != nil {
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return state, 0, 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, retainHeight, err := blockExec.Commit(state, block, abciResponses.DeliverTxs)
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if err != nil {
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return state, 0, 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, validatorUpdates)
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return state, retainHeight, nil
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}
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// Commit locks the mempool, runs the ABCI Commit message, and updates the
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// mempool.
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// It returns the result of calling abci.Commit (the AppHash) and the height to retain (if any).
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// The Mempool must be locked during commit and update because state is
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// typically reset on Commit and old txs must be replayed against committed
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// state before new txs are run in the mempool, lest they be invalid.
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func (blockExec *BlockExecutor) Commit(
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state State,
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block *types.Block,
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deliverTxResponses []*abci.ResponseDeliverTx,
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) ([]byte, int64, 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, 0, 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(
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"Client error during proxyAppConn.CommitSync",
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"err", err,
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)
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return nil, 0, err
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}
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// ResponseCommit has no error code - just data
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blockExec.logger.Info(
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"Committed state",
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"height", block.Height,
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"txs", len(block.Txs),
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"appHash", fmt.Sprintf("%X", res.Data),
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)
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// Update mempool.
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err = blockExec.mempool.Update(
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block.Height,
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block.Txs,
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deliverTxResponses,
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TxPreCheck(state),
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TxPostCheck(state),
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)
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return res.Data, res.RetainHeight, err
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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(
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logger log.Logger,
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proxyAppConn proxy.AppConnConsensus,
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block *types.Block,
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stateDB dbm.DB,
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) (*tmstate.ABCIResponses, error) {
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var validTxs, invalidTxs = 0, 0
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txIndex := 0
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abciResponses := new(tmstate.ABCIResponses)
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dtxs := make([]*abci.ResponseDeliverTx, len(block.Txs))
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abciResponses.DeliverTxs = dtxs
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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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if r, ok := res.Value.(*abci.Response_DeliverTx); ok {
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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.DeliverTxs[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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commitInfo, byzVals := getBeginBlockValidatorInfo(block, stateDB)
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// Begin block
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var err error
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pbh := block.Header.ToProto()
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if pbh == nil {
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return nil, errors.New("nil header")
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}
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abciResponses.BeginBlock, err = proxyAppConn.BeginBlockSync(abci.RequestBeginBlock{
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Hash: block.Hash(),
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Header: *pbh,
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LastCommitInfo: commitInfo,
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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(abci.RequestDeliverTx{Tx: 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{Height: 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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return abciResponses, nil
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}
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func getBeginBlockValidatorInfo(block *types.Block, stateDB dbm.DB) (abci.LastCommitInfo, []abci.Evidence) {
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voteInfos := make([]abci.VoteInfo, block.LastCommit.Size())
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// block.Height=1 -> LastCommitInfo.Votes are empty.
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// Remember that the first LastCommit is intentionally empty, so it makes
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// sense for LastCommitInfo.Votes to also be empty.
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if block.Height > 1 {
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lastValSet, err := LoadValidators(stateDB, block.Height-1)
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if err != nil {
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panic(err)
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}
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// Sanity check that commit size matches validator set size - only applies
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// after first block.
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var (
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commitSize = block.LastCommit.Size()
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valSetLen = len(lastValSet.Validators)
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)
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if commitSize != valSetLen {
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panic(fmt.Sprintf("commit size (%d) doesn't match valset length (%d) at height %d\n\n%v\n\n%v",
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commitSize, valSetLen, block.Height, block.LastCommit.Signatures, lastValSet.Validators))
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}
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for i, val := range lastValSet.Validators {
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commitSig := block.LastCommit.Signatures[i]
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voteInfos[i] = abci.VoteInfo{
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Validator: types.TM2PB.Validator(val),
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SignedLastBlock: !commitSig.Absent(),
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}
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}
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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)
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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 abci.LastCommitInfo{
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Round: block.LastCommit.Round,
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Votes: voteInfos,
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}, byzVals
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}
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func validateValidatorUpdates(abciUpdates []abci.ValidatorUpdate,
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params tmproto.ValidatorParams) error {
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for _, valUpdate := range abciUpdates {
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if valUpdate.GetPower() < 0 {
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return fmt.Errorf("voting power can't be negative %v", valUpdate)
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} else if valUpdate.GetPower() == 0 {
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// continue, since this is deleting the validator, and thus there is no
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// pubkey to check
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continue
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}
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// Check if validator's pubkey matches an ABCI type in the consensus params
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pk, err := cryptoenc.PubKeyFromProto(valUpdate.PubKey)
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if err != nil {
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return err
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}
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if !types.IsValidPubkeyType(params, pk.Type()) {
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return fmt.Errorf("validator %v is using pubkey %s, which is unsupported for consensus",
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valUpdate, pk.Type())
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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(
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state State,
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blockID types.BlockID,
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header *types.Header,
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abciResponses *tmstate.ABCIResponses,
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validatorUpdates []*types.Validator,
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) (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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nValSet := state.NextValidators.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(validatorUpdates) > 0 {
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err := nValSet.UpdateWithChangeSet(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 next height.
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lastHeightValsChanged = header.Height + 1 + 1
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}
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// Update validator proposer priority and set state variables.
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nValSet.IncrementProposerPriority(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 = types.UpdateConsensusParams(state.ConsensusParams, abciResponses.EndBlock.ConsensusParamUpdates)
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err := types.ValidateConsensusParams(nextParams)
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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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// TODO: allow app to upgrade version
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nextVersion := state.Version
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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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Version: nextVersion,
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ChainID: state.ChainID,
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LastBlockHeight: header.Height,
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LastBlockID: blockID,
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LastBlockTime: header.Time,
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NextValidators: nValSet,
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Validators: state.NextValidators.Copy(),
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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: ABCIResponsesResultsHash(*abciResponses),
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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(
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logger log.Logger,
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eventBus types.BlockEventPublisher,
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block *types.Block,
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abciResponses *tmstate.ABCIResponses,
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validatorUpdates []*types.Validator,
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) {
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eventBus.PublishEventNewBlock(types.EventDataNewBlock{
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Block: block,
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ResultBeginBlock: *abciResponses.BeginBlock,
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ResultEndBlock: *abciResponses.EndBlock,
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})
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eventBus.PublishEventNewBlockHeader(types.EventDataNewBlockHeader{
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Header: block.Header,
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NumTxs: int64(len(block.Txs)),
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ResultBeginBlock: *abciResponses.BeginBlock,
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ResultEndBlock: *abciResponses.EndBlock,
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})
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for i, tx := range block.Data.Txs {
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eventBus.PublishEventTx(types.EventDataTx{TxResult: abci.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.DeliverTxs[i]),
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}})
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}
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if len(validatorUpdates) > 0 {
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eventBus.PublishEventValidatorSetUpdates(
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types.EventDataValidatorSetUpdates{ValidatorUpdates: validatorUpdates})
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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.
|
|
// It returns the application root hash (result of abci.Commit).
|
|
func ExecCommitBlock(
|
|
appConnConsensus proxy.AppConnConsensus,
|
|
block *types.Block,
|
|
logger log.Logger,
|
|
stateDB dbm.DB,
|
|
) ([]byte, error) {
|
|
_, err := execBlockOnProxyApp(logger, appConnConsensus, block, stateDB)
|
|
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
|
|
}
|