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420 lines
12 KiB
420 lines
12 KiB
package state
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import (
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"bytes"
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"errors"
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"github.com/ebuchman/fail-test"
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. "github.com/tendermint/go-common"
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cfg "github.com/tendermint/go-config"
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"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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tmsp "github.com/tendermint/tmsp/types"
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)
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//--------------------------------------------------
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// Execute the block
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// Execute the block to mutate State.
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// Validates block and then executes Data.Txs in the block.
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func (s *State) ExecBlock(eventCache types.Fireable, proxyAppConn proxy.AppConnConsensus, block *types.Block, blockPartsHeader types.PartSetHeader) error {
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// Validate the block.
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if err := s.validateBlock(block); err != nil {
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return ErrInvalidBlock(err)
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}
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// compute bitarray of validators that signed
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signed := commitBitArrayFromBlock(block)
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_ = signed // TODO send on begin block
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// copy the valset
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valSet := s.Validators.Copy()
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nextValSet := valSet.Copy()
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// Execute the block txs
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changedValidators, err := execBlockOnProxyApp(eventCache, proxyAppConn, block)
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if err != nil {
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// There was some error in proxyApp
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// TODO Report error and wait for proxyApp to be available.
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return ErrProxyAppConn(err)
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}
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// update the validator set
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err = updateValidators(nextValSet, changedValidators)
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if err != nil {
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log.Warn("Error changing validator set", "error", err)
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// TODO: err or carry on?
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}
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// All good!
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// Update validator accums and set state variables
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nextValSet.IncrementAccum(1)
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s.SetBlockAndValidators(block.Header, blockPartsHeader, valSet, nextValSet)
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// save state with updated height/blockhash/validators
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// but stale apphash, in case we fail between Commit and Save
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s.Save()
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return nil
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}
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// Executes block's transactions on proxyAppConn.
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// Returns a list of updates to the validator set
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// TODO: Generate a bitmap or otherwise store tx validity in state.
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func execBlockOnProxyApp(eventCache types.Fireable, proxyAppConn proxy.AppConnConsensus, block *types.Block) ([]*tmsp.Validator, error) {
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var validTxs, invalidTxs = 0, 0
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// Execute transactions and get hash
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proxyCb := func(req *tmsp.Request, res *tmsp.Response) {
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switch r := res.Value.(type) {
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case *tmsp.Response_AppendTx:
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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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// reqAppendTx := req.(tmsp.RequestAppendTx)
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txError := ""
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apTx := r.AppendTx
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if apTx.Code == tmsp.CodeType_OK {
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validTxs += 1
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} else {
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log.Debug("Invalid tx", "code", r.AppendTx.Code, "log", r.AppendTx.Log)
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invalidTxs += 1
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txError = apTx.Code.String()
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}
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// NOTE: if we count we can access the tx from the block instead of
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// pulling it from the req
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event := types.EventDataTx{
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Tx: req.GetAppendTx().Tx,
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Data: apTx.Data,
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Code: apTx.Code,
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Log: apTx.Log,
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Error: txError,
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}
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types.FireEventTx(eventCache, event)
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}
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}
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proxyAppConn.SetResponseCallback(proxyCb)
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// Begin block
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err := proxyAppConn.BeginBlockSync(block.Hash(), types.TM2PB.Header(block.Header))
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if err != nil {
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log.Warn("Error in proxyAppConn.BeginBlock", "error", err)
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return nil, err
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}
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fail.Fail() // XXX
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// Run txs of block
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for _, tx := range block.Txs {
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fail.FailRand(len(block.Txs)) // XXX
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proxyAppConn.AppendTxAsync(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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fail.Fail() // XXX
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// End block
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changedValidators, err := proxyAppConn.EndBlockSync(uint64(block.Height))
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if err != nil {
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log.Warn("Error in proxyAppConn.EndBlock", "error", err)
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return nil, err
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}
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fail.Fail() // XXX
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log.Info("Executed block", "height", block.Height, "valid txs", validTxs, "invalid txs", invalidTxs)
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if len(changedValidators) > 0 {
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log.Info("Update to validator set", "updates", tmsp.ValidatorsString(changedValidators))
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}
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return changedValidators, nil
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}
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func updateValidators(validators *types.ValidatorSet, changedValidators []*tmsp.Validator) error {
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// TODO: prevent change of 1/3+ at once
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for _, v := range changedValidators {
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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 uint64
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if power < 0 {
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return errors.New(Fmt("Power (%d) overflows int64", v.Power))
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}
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_, val := validators.GetByAddress(address)
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if val == nil {
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// add val
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added := validators.Add(types.NewValidator(pubkey, power))
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if !added {
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return errors.New(Fmt("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 := validators.Remove(address)
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if !removed {
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return errors.New(Fmt("Failed to remove validator %X)"))
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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 := validators.Update(val)
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if !updated {
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return errors.New(Fmt("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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// return a bit array of validators that signed the last commit
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// NOTE: assumes commits have already been authenticated
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func commitBitArrayFromBlock(block *types.Block) *BitArray {
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signed := NewBitArray(len(block.LastCommit.Precommits))
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for i, precommit := range block.LastCommit.Precommits {
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if precommit != nil {
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signed.SetIndex(i, true) // val_.LastCommitHeight = block.Height - 1
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}
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}
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return signed
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}
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//-----------------------------------------------------
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// Validate block
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func (s *State) ValidateBlock(block *types.Block) error {
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return s.validateBlock(block)
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}
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func (s *State) validateBlock(block *types.Block) error {
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// Basic block validation.
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err := block.ValidateBasic(s.ChainID, s.LastBlockHeight, s.LastBlockID, s.LastBlockTime, s.AppHash)
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if err != nil {
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return err
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}
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// Validate block LastCommit.
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if block.Height == 1 {
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if len(block.LastCommit.Precommits) != 0 {
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return errors.New("Block at height 1 (first block) should have no LastCommit precommits")
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}
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} else {
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if len(block.LastCommit.Precommits) != s.LastValidators.Size() {
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return errors.New(Fmt("Invalid block commit size. Expected %v, got %v",
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s.LastValidators.Size(), len(block.LastCommit.Precommits)))
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}
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err := s.LastValidators.VerifyCommit(
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s.ChainID, s.LastBlockID, block.Height-1, block.LastCommit)
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if err != nil {
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return err
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}
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}
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return nil
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}
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//-----------------------------------------------------------------------------
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// ApplyBlock executes the block, then commits and updates the mempool atomically
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// Execute and commit block against app, save block and state
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func (s *State) ApplyBlock(eventCache types.Fireable, proxyAppConn proxy.AppConnConsensus,
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block *types.Block, partsHeader types.PartSetHeader, mempool Mempool) error {
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// Run the block on the State:
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// + update validator sets
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// + run txs on the proxyAppConn
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err := s.ExecBlock(eventCache, proxyAppConn, block, partsHeader)
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if err != nil {
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return errors.New(Fmt("Exec failed for application: %v", err))
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}
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// lock mempool, commit state, update mempoool
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err = s.CommitStateUpdateMempool(proxyAppConn, block, mempool)
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if err != nil {
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return errors.New(Fmt("Commit failed for application: %v", err))
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}
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return nil
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}
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// mempool must be locked during commit and update
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// 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 (s *State) CommitStateUpdateMempool(proxyAppConn proxy.AppConnConsensus, block *types.Block, mempool Mempool) error {
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mempool.Lock()
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defer mempool.Unlock()
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// Commit block, get hash back
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res := proxyAppConn.CommitSync()
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if res.IsErr() {
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log.Warn("Error in proxyAppConn.CommitSync", "error", res)
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return res
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}
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if res.Log != "" {
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log.Debug("Commit.Log: " + res.Log)
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}
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// Set the state's new AppHash
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s.AppHash = res.Data
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s.AppHashIsStale = false
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// Update mempool.
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mempool.Update(block.Height, block.Txs)
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return nil
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}
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// Updates to the mempool need to be synchronized with committing a block
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// so apps can reset their transient state on Commit
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type Mempool interface {
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Lock()
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Unlock()
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Update(height int, txs []types.Tx)
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}
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type MockMempool struct {
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}
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func (m MockMempool) Lock() {}
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func (m MockMempool) Unlock() {}
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func (m MockMempool) Update(height int, txs []types.Tx) {}
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//----------------------------------------------------------------
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// Handshake with app to sync to latest state of core by replaying blocks
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// TODO: Should we move blockchain/store.go to its own package?
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type BlockStore interface {
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Height() int
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LoadBlock(height int) *types.Block
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LoadBlockMeta(height int) *types.BlockMeta
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}
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type Handshaker struct {
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config cfg.Config
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state *State
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store BlockStore
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nBlocks int // number of blocks applied to the state
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}
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func NewHandshaker(config cfg.Config, state *State, store BlockStore) *Handshaker {
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return &Handshaker{config, state, store, 0}
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}
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// TODO: retry the handshake/replay if it fails ?
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func (h *Handshaker) Handshake(proxyApp proxy.AppConns) error {
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// handshake is done via info request on the query conn
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res, tmspInfo, blockInfo, configInfo := proxyApp.Query().InfoSync()
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if res.IsErr() {
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return errors.New(Fmt("Error calling Info. Code: %v; Data: %X; Log: %s", res.Code, res.Data, res.Log))
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}
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if blockInfo == nil {
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log.Warn("blockInfo is nil, aborting handshake")
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return nil
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}
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log.Notice("TMSP Handshake", "height", blockInfo.BlockHeight, "app_hash", blockInfo.AppHash)
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blockHeight := int(blockInfo.BlockHeight) // XXX: beware overflow
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appHash := blockInfo.AppHash
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if tmspInfo != nil {
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// TODO: check tmsp version (or do this in the tmspcli?)
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_ = tmspInfo
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}
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if configInfo != nil {
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// TODO: set config info
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_ = configInfo
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}
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// replay blocks up to the latest in the blockstore
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err := h.ReplayBlocks(appHash, blockHeight, proxyApp.Consensus())
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if err != nil {
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return errors.New(Fmt("Error on replay: %v", err))
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}
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// TODO: (on restart) replay mempool
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return nil
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}
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// Replay all blocks after blockHeight and ensure the result matches the current state.
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func (h *Handshaker) ReplayBlocks(appHash []byte, appBlockHeight int, appConnConsensus proxy.AppConnConsensus) error {
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storeBlockHeight := h.store.Height()
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if storeBlockHeight < appBlockHeight {
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// if the app is ahead, there's nothing we can do
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return ErrAppBlockHeightTooHigh{storeBlockHeight, appBlockHeight}
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} else if storeBlockHeight == appBlockHeight {
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// if we crashed between Commit and SaveState,
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// the state's app hash is stale
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// otherwise we're synced
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if h.state.AppHashIsStale {
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h.state.AppHashIsStale = false
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h.state.AppHash = appHash
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}
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return nil
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} else if h.state.LastBlockHeight == appBlockHeight {
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// store is ahead of app but core's state height is at apps height
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// this happens if we crashed after saving the block,
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// but before committing it. We should be 1 ahead
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if storeBlockHeight != appBlockHeight+1 {
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PanicSanity(Fmt("core.state.height == app.height but store.height (%d) > app.height+1 (%d)", storeBlockHeight, appBlockHeight+1))
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}
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// check that the blocks last apphash is the states apphash
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block := h.store.LoadBlock(storeBlockHeight)
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if !bytes.Equal(block.Header.AppHash, appHash) {
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return ErrLastStateMismatch{storeBlockHeight, block.Header.AppHash, appHash}
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}
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blockMeta := h.store.LoadBlockMeta(storeBlockHeight)
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h.nBlocks += 1
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var eventCache types.Fireable // nil
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// replay the block against the actual tendermint state
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return h.state.ApplyBlock(eventCache, appConnConsensus, block, blockMeta.PartsHeader, MockMempool{})
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} else {
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// either we're caught up or there's blocks to replay
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// replay all blocks starting with appBlockHeight+1
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var eventCache types.Fireable // nil
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var appHash []byte
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for i := appBlockHeight + 1; i <= storeBlockHeight; i++ {
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h.nBlocks += 1
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block := h.store.LoadBlock(i)
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_, err := execBlockOnProxyApp(eventCache, appConnConsensus, block)
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if err != nil {
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log.Warn("Error executing block on proxy app", "height", i, "err", err)
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return err
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}
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// Commit block, get hash back
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res := appConnConsensus.CommitSync()
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if res.IsErr() {
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log.Warn("Error in proxyAppConn.CommitSync", "error", res)
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return res
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}
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if res.Log != "" {
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log.Info("Commit.Log: " + res.Log)
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}
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appHash = res.Data
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}
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if !bytes.Equal(h.state.AppHash, appHash) {
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return errors.New(Fmt("Tendermint state.AppHash does not match AppHash after replay", "expected", h.state.AppHash, "got", appHash))
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}
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return nil
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}
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}
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