package state import ( "errors" "fmt" fail "github.com/ebuchman/fail-test" abci "github.com/tendermint/abci/types" crypto "github.com/tendermint/go-crypto" "github.com/tendermint/tendermint/proxy" "github.com/tendermint/tendermint/types" cmn "github.com/tendermint/tmlibs/common" "github.com/tendermint/tmlibs/log" ) //-------------------------------------------------- // Execute the block // ValExecBlock executes the block, but does NOT mutate State. // + validates the block // + executes block.Txs on the proxyAppConn func (s *State) ValExecBlock(txEventPublisher types.TxEventPublisher, proxyAppConn proxy.AppConnConsensus, block *types.Block) (*ABCIResponses, error) { // Validate the block. if err := s.validateBlock(block); err != nil { return nil, ErrInvalidBlock(err) } // Execute the block txs abciResponses, err := execBlockOnProxyApp(txEventPublisher, proxyAppConn, block, s.logger) if err != nil { // There was some error in proxyApp // TODO Report error and wait for proxyApp to be available. return nil, ErrProxyAppConn(err) } return abciResponses, nil } // Executes block's transactions on proxyAppConn. // Returns a list of transaction results and updates to the validator set // TODO: Generate a bitmap or otherwise store tx validity in state. func execBlockOnProxyApp(txEventPublisher types.TxEventPublisher, proxyAppConn proxy.AppConnConsensus, block *types.Block, logger log.Logger) (*ABCIResponses, error) { var validTxs, invalidTxs = 0, 0 txIndex := 0 abciResponses := NewABCIResponses(block) // Execute transactions and get hash proxyCb := func(req *abci.Request, res *abci.Response) { switch r := res.Value.(type) { case *abci.Response_DeliverTx: // TODO: make use of res.Log // TODO: make use of this info // Blocks may include invalid txs. // reqDeliverTx := req.(abci.RequestDeliverTx) txResult := r.DeliverTx if txResult.Code == abci.CodeType_OK { validTxs++ } else { logger.Debug("Invalid tx", "code", txResult.Code, "log", txResult.Log) invalidTxs++ } // NOTE: if we count we can access the tx from the block instead of // pulling it from the req txEventPublisher.PublishEventTx(types.EventDataTx{types.TxResult{ Height: block.Height, Index: uint32(txIndex), Tx: types.Tx(req.GetDeliverTx().Tx), Result: *txResult, }}) abciResponses.DeliverTx[txIndex] = txResult txIndex++ } } proxyAppConn.SetResponseCallback(proxyCb) // Begin block _, err := proxyAppConn.BeginBlockSync(abci.RequestBeginBlock{ block.Hash(), types.TM2PB.Header(block.Header), }) if err != nil { logger.Error("Error in proxyAppConn.BeginBlock", "err", err) return nil, err } // Run txs of block for _, tx := range block.Txs { proxyAppConn.DeliverTxAsync(tx) if err := proxyAppConn.Error(); err != nil { return nil, err } } // End block abciResponses.EndBlock, err = proxyAppConn.EndBlockSync(abci.RequestEndBlock{uint64(block.Height)}) if err != nil { logger.Error("Error in proxyAppConn.EndBlock", "err", err) return nil, err } valDiff := abciResponses.EndBlock.Diffs logger.Info("Executed block", "height", block.Height, "validTxs", validTxs, "invalidTxs", invalidTxs) if len(valDiff) > 0 { logger.Info("Update to validator set", "updates", abci.ValidatorsString(valDiff)) } return abciResponses, nil } func updateValidators(validators *types.ValidatorSet, changedValidators []*abci.Validator) error { // TODO: prevent change of 1/3+ at once for _, v := range changedValidators { pubkey, err := crypto.PubKeyFromBytes(v.PubKey) // NOTE: expects go-wire encoded pubkey if err != nil { return err } address := pubkey.Address() power := int64(v.Power) // mind the overflow from int64 if power < 0 { return errors.New(cmn.Fmt("Power (%d) overflows int64", v.Power)) } _, val := validators.GetByAddress(address) if val == nil { // add val added := validators.Add(types.NewValidator(pubkey, power)) if !added { return errors.New(cmn.Fmt("Failed to add new validator %X with voting power %d", address, power)) } } else if v.Power == 0 { // remove val _, removed := validators.Remove(address) if !removed { return errors.New(cmn.Fmt("Failed to remove validator %X)")) } } else { // update val val.VotingPower = power updated := validators.Update(val) if !updated { return errors.New(cmn.Fmt("Failed to update validator %X with voting power %d", address, power)) } } } return nil } // return a bit array of validators that signed the last commit // NOTE: assumes commits have already been authenticated /* function is currently unused func commitBitArrayFromBlock(block *types.Block) *cmn.BitArray { signed := cmn.NewBitArray(len(block.LastCommit.Precommits)) for i, precommit := range block.LastCommit.Precommits { if precommit != nil { signed.SetIndex(i, true) // val_.LastCommitHeight = block.Height - 1 } } return signed } */ //----------------------------------------------------- // Validate block // ValidateBlock validates the block against the state. func (s *State) ValidateBlock(block *types.Block) error { return s.validateBlock(block) } func (s *State) validateBlock(block *types.Block) error { // Basic block validation. err := block.ValidateBasic(s.ChainID, s.LastBlockHeight, s.LastBlockID, s.LastBlockTime, s.AppHash) if err != nil { return err } // Validate block LastCommit. if block.Height == 1 { if len(block.LastCommit.Precommits) != 0 { return errors.New("Block at height 1 (first block) should have no LastCommit precommits") } } else { if len(block.LastCommit.Precommits) != s.LastValidators.Size() { return errors.New(cmn.Fmt("Invalid block commit size. Expected %v, got %v", s.LastValidators.Size(), len(block.LastCommit.Precommits))) } err := s.LastValidators.VerifyCommit( s.ChainID, s.LastBlockID, block.Height-1, block.LastCommit) if err != nil { return err } } return nil } //----------------------------------------------------------------------------- // ApplyBlock validates & executes the block, updates state w/ ABCI responses, // then commits and updates the mempool atomically, then saves state. // ApplyBlock validates the block against the state, executes it against the app, // commits it, and saves the block and state. It's the only function that needs to be called // from outside this package to process and commit an entire block. func (s *State) ApplyBlock(txEventPublisher types.TxEventPublisher, proxyAppConn proxy.AppConnConsensus, block *types.Block, partsHeader types.PartSetHeader, mempool types.Mempool) error { abciResponses, err := s.ValExecBlock(txEventPublisher, proxyAppConn, block) if err != nil { return fmt.Errorf("Exec failed for application: %v", err) } fail.Fail() // XXX // save the results before we commit s.SaveABCIResponses(abciResponses) fail.Fail() // XXX // now update the block and validators s.SetBlockAndValidators(block.Header, partsHeader, abciResponses) // lock mempool, commit state, update mempoool err = s.CommitStateUpdateMempool(proxyAppConn, block, mempool) if err != nil { return fmt.Errorf("Commit failed for application: %v", err) } fail.Fail() // XXX // save the state and the validators s.Save() return nil } // CommitStateUpdateMempool locks the mempool, runs the ABCI Commit message, and updates the mempool. // The Mempool must be locked during commit and update because state is typically reset on Commit and old txs must be replayed // against committed state before new txs are run in the mempool, lest they be invalid. func (s *State) CommitStateUpdateMempool(proxyAppConn proxy.AppConnConsensus, block *types.Block, mempool types.Mempool) error { mempool.Lock() defer mempool.Unlock() // Commit block, get hash back res, err := proxyAppConn.CommitSync() if err != nil { s.logger.Error("Client error during proxyAppConn.CommitSync", "err", err) return err } if res.IsErr() { s.logger.Error("Error in proxyAppConn.CommitSync", "err", res) return res } if res.Log != "" { s.logger.Debug("Commit.Log: " + res.Log) } s.logger.Info("Committed state", "height", block.Height, "txs", block.NumTxs, "hash", res.Data) // Set the state's new AppHash s.AppHash = res.Data // Update mempool. return mempool.Update(block.Height, block.Txs) } // ExecCommitBlock executes and commits a block on the proxyApp without validating or mutating the state. // It returns the application root hash (result of abci.Commit). func ExecCommitBlock(appConnConsensus proxy.AppConnConsensus, block *types.Block, logger log.Logger) ([]byte, error) { _, err := execBlockOnProxyApp(types.NopEventBus{}, appConnConsensus, block, logger) 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 } if res.IsErr() { logger.Error("Error in proxyAppConn.CommitSync", "err", res) return nil, res } if res.Log != "" { logger.Info("Commit.Log: " + res.Log) } return res.Data, nil }