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421 lines
13 KiB
421 lines
13 KiB
package state
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import (
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"errors"
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"fmt"
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fail "github.com/ebuchman/fail-test"
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abci "github.com/tendermint/abci/types"
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crypto "github.com/tendermint/go-crypto"
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"github.com/tendermint/tendermint/proxy"
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"github.com/tendermint/tendermint/types"
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dbm "github.com/tendermint/tmlibs/db"
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"github.com/tendermint/tmlibs/log"
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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 types.Mempool
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evpool types.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 types.Mempool, evpool types.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(s State, block *types.Block) error {
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return validateBlock(blockExec.db, s, 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(s State, blockID types.BlockID, block *types.Block) (State, error) {
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if err := blockExec.ValidateBlock(s, block); err != nil {
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return s, ErrInvalidBlock(err)
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}
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abciResponses, err := execBlockOnProxyApp(blockExec.logger, blockExec.proxyApp, block)
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if err != nil {
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return s, 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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s, err = updateState(s, blockID, block.Header, abciResponses)
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if err != nil {
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return s, fmt.Errorf("Commit failed for application: %v", err)
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}
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// lock mempool, commit state, update mempoool
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appHash, err := blockExec.Commit(block)
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if err != nil {
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return s, fmt.Errorf("Commit failed for application: %v", err)
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}
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fail.Fail() // XXX
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// update the app hash and save the state
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s.AppHash = appHash
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SaveState(blockExec.db, s)
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fail.Fail() // XXX
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// Update evpool now that state is saved
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// TODO: handle the crash/recover scenario
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// ie. (may need to call Update for last block)
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blockExec.evpool.Update(block)
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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 s, 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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// 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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if res.IsErr() {
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blockExec.logger.Error("Error in proxyAppConn.CommitSync", "err", res)
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return nil, res
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}
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if res.Log != "" {
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blockExec.logger.Debug("Commit.Log: " + res.Log)
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}
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blockExec.logger.Info("Committed state", "height", block.Height, "txs", block.NumTxs, "appHash", 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, block *types.Block) (*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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// determine which validators did not sign last block
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absentVals := make([]int32, 0)
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for valI, vote := range block.LastCommit.Precommits {
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if vote == nil {
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absentVals = append(absentVals, int32(valI))
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}
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}
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// TODO: determine which validators were byzantine
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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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AbsentValidators: absentVals,
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ByzantineValidators: nil,
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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 updateValidators(currentSet *types.ValidatorSet, updates []*abci.Validator) error {
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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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vp23, err := changeInVotingPowerMoreOrEqualToOneThird(currentSet, updates)
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if err != nil {
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return err
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}
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if vp23 {
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return errors.New("the change in voting power must be strictly less than 1/3")
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}
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for _, v := range updates {
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pubkey, err := crypto.PubKeyFromBytes(v.PubKey) // NOTE: expects go-wire encoded pubkey
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if err != nil {
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return err
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}
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address := pubkey.Address()
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power := int64(v.Power)
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// mind the overflow from int64
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if power < 0 {
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return fmt.Errorf("Power (%d) overflows int64", v.Power)
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}
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_, val := currentSet.GetByAddress(address)
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if val == nil {
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// add val
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added := currentSet.Add(types.NewValidator(pubkey, power))
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if !added {
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return fmt.Errorf("Failed to add new validator %X with voting power %d", address, power)
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}
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} else if v.Power == 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 {
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// update val
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val.VotingPower = power
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updated := currentSet.Update(val)
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if !updated {
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return fmt.Errorf("Failed to update validator %X with voting power %d", address, power)
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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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func changeInVotingPowerMoreOrEqualToOneThird(currentSet *types.ValidatorSet, updates []*abci.Validator) (bool, error) {
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threshold := currentSet.TotalVotingPower() * 1 / 3
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acc := int64(0)
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for _, v := range updates {
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pubkey, err := crypto.PubKeyFromBytes(v.PubKey) // NOTE: expects go-wire encoded pubkey
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if err != nil {
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return false, err
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}
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address := pubkey.Address()
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power := int64(v.Power)
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// mind the overflow from int64
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if power < 0 {
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return false, fmt.Errorf("Power (%d) overflows int64", v.Power)
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}
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_, val := currentSet.GetByAddress(address)
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if val == nil {
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acc += power
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} else {
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np := val.VotingPower - power
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if np < 0 {
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np = -np
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}
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acc += np
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}
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if acc >= threshold {
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return true, nil
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}
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}
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return false, 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(s 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 := s.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 := s.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 s, 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 := s.ConsensusParams
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lastHeightParamsChanged := s.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 = s.ConsensusParams.Update(abciResponses.EndBlock.ConsensusParamUpdates)
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err := nextParams.Validate()
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if err != nil {
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return s, 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: s.ChainID,
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LastBlockHeight: header.Height,
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LastBlockTotalTx: s.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: s.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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// NOTE: do we still need this buffer ?
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txEventBuffer := types.NewTxEventBuffer(eventBus, int(block.NumTxs))
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for i, tx := range block.Data.Txs {
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txEventBuffer.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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eventBus.PublishEventNewBlock(types.EventDataNewBlock{block})
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eventBus.PublishEventNewBlockHeader(types.EventDataNewBlockHeader{block.Header})
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err := txEventBuffer.Flush()
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if err != nil {
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logger.Error("Failed to flush event buffer", "err", err)
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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, logger log.Logger) ([]byte, error) {
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_, err := execBlockOnProxyApp(logger, appConnConsensus, block)
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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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if res.IsErr() {
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logger.Error("Error in proxyAppConn.CommitSync", "err", res)
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return nil, res
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}
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if res.Log != "" {
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logger.Info("Commit.Log: " + res.Log)
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}
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return res.Data, nil
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}
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