Golang Block.Header方法代码示例

// insert injects a new head block into the current block chain. This method
// assumes that the block is indeed a true head. It will also reset the head
// header and the head fast sync block to this very same block if they are older
// or if they are on a different side chain.
//
// Note, this function assumes that the `mu` mutex is held!
func (bc *BlockChain) insert(block *types.Block) {
	// If the block is on a side chain or an unknown one, force other heads onto it too
	updateHeads := GetCanonicalHash(bc.chainDb, block.NumberU64()) != block.Hash()

	// Add the block to the canonical chain number scheme and mark as the head
	if err := WriteCanonicalHash(bc.chainDb, block.Hash(), block.NumberU64()); err != nil {
		glog.Fatalf("failed to insert block number: %v", err)
	}
	if err := WriteHeadBlockHash(bc.chainDb, block.Hash()); err != nil {
		glog.Fatalf("failed to insert head block hash: %v", err)
	}
	bc.currentBlock = block

	// If the block is better than out head or is on a different chain, force update heads
	if updateHeads {
		if err := WriteHeadHeaderHash(bc.chainDb, block.Hash()); err != nil {
			glog.Fatalf("failed to insert head header hash: %v", err)
		}
		bc.currentHeader = block.Header()

		if err := WriteHeadFastBlockHash(bc.chainDb, block.Hash()); err != nil {
			glog.Fatalf("failed to insert head fast block hash: %v", err)
		}
		bc.currentFastBlock = block
	}
}

func (self *BlockProcessor) ApplyTransactions(gp GasPool, statedb *state.StateDB, block *types.Block, txs types.Transactions, transientProcess bool) (types.Receipts, error) {
	var (
		receipts      types.Receipts
		totalUsedGas  = big.NewInt(0)
		err           error
		cumulativeSum = new(big.Int)
		header        = block.Header()
	)

	for i, tx := range txs {
		statedb.StartRecord(tx.Hash(), block.Hash(), i)

		receipt, txGas, err := self.ApplyTransaction(gp, statedb, header, tx, totalUsedGas, transientProcess)
		if err != nil {
			return nil, err
		}

		if err != nil {
			glog.V(logger.Core).Infoln("TX err:", err)
		}
		receipts = append(receipts, receipt)

		cumulativeSum.Add(cumulativeSum, new(big.Int).Mul(txGas, tx.GasPrice()))
	}

	if block.GasUsed().Cmp(totalUsedGas) != 0 {
		return nil, ValidationError(fmt.Sprintf("gas used error (%v / %v)", block.GasUsed(), totalUsedGas))
	}

	if transientProcess {
		go self.eventMux.Post(PendingBlockEvent{block, statedb.Logs()})
	}

	return receipts, err
}

// Process processes the state changes according to the Expanse rules by running
// the transaction messages using the statedb and applying any rewards to both
// the processor (coinbase) and any included uncles.
//
// Process returns the receipts and logs accumulated during the process and
// returns the amount of gas that was used in the process. If any of the
// transactions failed to execute due to insufficient gas it will return an error.
func (p *StateProcessor) Process(block *types.Block, statedb *state.StateDB, cfg vm.Config) (types.Receipts, vm.Logs, *big.Int, error) {
	var (
		receipts     types.Receipts
		totalUsedGas = big.NewInt(0)
		err          error
		header       = block.Header()
		allLogs      vm.Logs
		gp           = new(GasPool).AddGas(block.GasLimit())
	)
	// Mutate the the block and state according to any hard-fork specs
	if p.config.DAOForkSupport && p.config.DAOForkBlock != nil && p.config.DAOForkBlock.Cmp(block.Number()) == 0 {
		ApplyDAOHardFork(statedb)
	}
	// Iterate over and process the individual transactions
	for i, tx := range block.Transactions() {
		statedb.StartRecord(tx.Hash(), block.Hash(), i)
		receipt, logs, _, err := ApplyTransaction(p.config, p.bc, gp, statedb, header, tx, totalUsedGas, cfg)
		if err != nil {
			return nil, nil, totalUsedGas, err
		}
		receipts = append(receipts, receipt)
		allLogs = append(allLogs, logs...)
	}
	AccumulateRewards(statedb, header, block.Uncles())

	return receipts, allLogs, totalUsedGas, err
}

// WriteBlock serializes a block into the database, header and body separately.
func WriteBlock(db ethdb.Database, block *types.Block) error {
	// Store the body first to retain database consistency
	if err := WriteBody(db, block.Hash(), block.Body()); err != nil {
		return err
	}
	// Store the header too, signaling full block ownership
	if err := WriteHeader(db, block.Header()); err != nil {
		return err
	}
	return nil
}

// ValidateBlock validates the given block's header and uncles and verifies the
// the block header's transaction and uncle roots.
//
// ValidateBlock does not validate the header's pow. The pow work validated
// seperately so we can process them in paralel.
//
// ValidateBlock also validates and makes sure that any previous state (or present)
// state that might or might not be present is checked to make sure that fast
// sync has done it's job proper. This prevents the block validator form accepting
// false positives where a header is present but the state is not.
func (v *BlockValidator) ValidateBlock(block *types.Block) error {
	if v.bc.HasBlock(block.Hash()) {
		if _, err := state.New(block.Root(), v.bc.chainDb); err == nil {
			return &KnownBlockError{block.Number(), block.Hash()}
		}
	}
	parent := v.bc.GetBlock(block.ParentHash())
	if parent == nil {
		return ParentError(block.ParentHash())
	}
	if _, err := state.New(parent.Root(), v.bc.chainDb); err != nil {
		return ParentError(block.ParentHash())
	}

	header := block.Header()
	// validate the block header
	if err := ValidateHeader(v.Pow, header, parent.Header(), false, false); err != nil {
		return err
	}
	// verify the uncles are correctly rewarded
	if err := v.VerifyUncles(block, parent); err != nil {
		return err
	}

	// Verify UncleHash before running other uncle validations
	unclesSha := types.CalcUncleHash(block.Uncles())
	if unclesSha != header.UncleHash {
		return fmt.Errorf("invalid uncles root hash. received=%x calculated=%x", header.UncleHash, unclesSha)
	}

	// The transactions Trie's root (R = (Tr [[i, RLP(T1)], [i, RLP(T2)], ... [n, RLP(Tn)]]))
	// can be used by light clients to make sure they've received the correct Txs
	txSha := types.DeriveSha(block.Transactions())
	if txSha != header.TxHash {
		return fmt.Errorf("invalid transaction root hash. received=%x calculated=%x", header.TxHash, txSha)
	}

	return nil
}

// ContractCall implements ContractCaller.ContractCall, executing the specified
// contract with the given input data.
func (b *SimulatedBackend) ContractCall(contract common.Address, data []byte, pending bool) ([]byte, error) {
	// Create a copy of the current state db to screw around with
	var (
		block   *types.Block
		statedb *state.StateDB
	)
	if pending {
		block, statedb = b.pendingBlock, b.pendingState
		defer statedb.RevertToSnapshot(statedb.Snapshot())
	} else {
		block = b.blockchain.CurrentBlock()
		statedb, _ = b.blockchain.State()
	}
	// If there's no code to interact with, respond with an appropriate error
	if code := statedb.GetCode(contract); len(code) == 0 {
		return nil, bind.ErrNoCode
	}
	// Set infinite balance to the a fake caller account
	from := statedb.GetOrNewStateObject(common.Address{})
	from.SetBalance(common.MaxBig)

	// Assemble the call invocation to measure the gas usage
	msg := callmsg{
		from:     from,
		to:       &contract,
		gasPrice: new(big.Int),
		gasLimit: common.MaxBig,
		value:    new(big.Int),
		data:     data,
	}

	// Execute the call and return
	vmenv := core.NewEnv(statedb, chainConfig, b.blockchain, msg, block.Header(), vm.Config{})
	gaspool := new(core.GasPool).AddGas(common.MaxBig)

	out, _, err := core.ApplyMessage(vmenv, msg, gaspool)
	return out, err
}

// ValidateState validates the various changes that happen after a state
// transition, such as amount of used gas, the receipt roots and the state root
// itself. ValidateState returns a database batch if the validation was a succes
// otherwise nil and an error is returned.
func (v *BlockValidator) ValidateState(block, parent *types.Block, statedb *state.StateDB, receipts types.Receipts, usedGas *big.Int) (err error) {
	header := block.Header()
	if block.GasUsed().Cmp(usedGas) != 0 {
		return ValidationError(fmt.Sprintf("gas used error (%v / %v)", block.GasUsed(), usedGas))
	}
	// Validate the received block's bloom with the one derived from the generated receipts.
	// For valid blocks this should always validate to true.
	rbloom := types.CreateBloom(receipts)
	if rbloom != header.Bloom {
		return fmt.Errorf("unable to replicate block's bloom=%x", rbloom)
	}
	// Tre receipt Trie's root (R = (Tr [[H1, R1], ... [Hn, R1]]))
	receiptSha := types.DeriveSha(receipts)
	if receiptSha != header.ReceiptHash {
		return fmt.Errorf("invalid receipt root hash. received=%x calculated=%x", header.ReceiptHash, receiptSha)
	}
	// Validate the state root against the received state root and throw
	// an error if they don't match.
	if root := statedb.IntermediateRoot(); header.Root != root {
		return fmt.Errorf("invalid merkle root: header=%x computed=%x", header.Root, root)
	}
	return nil
}

// Process processes the state changes according to the Ethereum rules by running
// the transaction messages using the statedb and applying any rewards to both
// the processor (coinbase) and any included uncles.
//
// Process returns the receipts and logs accumulated during the process and
// returns the amount of gas that was used in the process. If any of the
// transactions failed to execute due to insufficient gas it will return an error.
func (p *StateProcessor) Process(block *types.Block, statedb *state.StateDB) (types.Receipts, vm.Logs, *big.Int, error) {
	var (
		receipts     types.Receipts
		totalUsedGas = big.NewInt(0)
		err          error
		header       = block.Header()
		allLogs      vm.Logs
		gp           = new(GasPool).AddGas(block.GasLimit())
	)

	for i, tx := range block.Transactions() {
		statedb.StartRecord(tx.Hash(), block.Hash(), i)
		receipt, logs, _, err := ApplyTransaction(p.bc, gp, statedb, header, tx, totalUsedGas)
		if err != nil {
			return nil, nil, totalUsedGas, err
		}
		receipts = append(receipts, receipt)
		allLogs = append(allLogs, logs...)
	}
	AccumulateRewards(statedb, header, block.Uncles())

	return receipts, allLogs, totalUsedGas, err
}

func (sm *BlockProcessor) processWithParent(block, parent *types.Block) (logs state.Logs, receipts types.Receipts, err error) {
	// Create a new state based on the parent's root (e.g., create copy)
	state := state.New(parent.Root(), sm.chainDb)
	header := block.Header()
	uncles := block.Uncles()
	txs := block.Transactions()

	// Block validation
	if err = ValidateHeader(sm.Pow, header, parent, false, false); err != nil {
		return
	}

	// There can be at most two uncles
	if len(uncles) > 2 {
		return nil, nil, ValidationError("Block can only contain maximum 2 uncles (contained %v)", len(uncles))
	}

	receipts, err = sm.TransitionState(state, parent, block, false)
	if err != nil {
		return
	}

	// Validate the received block's bloom with the one derived from the generated receipts.
	// For valid blocks this should always validate to true.
	rbloom := types.CreateBloom(receipts)
	if rbloom != header.Bloom {
		err = fmt.Errorf("unable to replicate block's bloom=%x", rbloom)
		return
	}

	// The transactions Trie's root (R = (Tr [[i, RLP(T1)], [i, RLP(T2)], ... [n, RLP(Tn)]]))
	// can be used by light clients to make sure they've received the correct Txs
	txSha := types.DeriveSha(txs)
	if txSha != header.TxHash {
		err = fmt.Errorf("invalid transaction root hash. received=%x calculated=%x", header.TxHash, txSha)
		return
	}

	// Tre receipt Trie's root (R = (Tr [[H1, R1], ... [Hn, R1]]))
	receiptSha := types.DeriveSha(receipts)
	if receiptSha != header.ReceiptHash {
		err = fmt.Errorf("invalid receipt root hash. received=%x calculated=%x", header.ReceiptHash, receiptSha)
		return
	}

	// Verify UncleHash before running other uncle validations
	unclesSha := types.CalcUncleHash(uncles)
	if unclesSha != header.UncleHash {
		err = fmt.Errorf("invalid uncles root hash. received=%x calculated=%x", header.UncleHash, unclesSha)
		return
	}

	// Verify uncles
	if err = sm.VerifyUncles(state, block, parent); err != nil {
		return
	}
	// Accumulate static rewards; block reward, uncle's and uncle inclusion.
	AccumulateRewards(state, header, uncles)

	// Commit state objects/accounts to a temporary trie (does not save)
	// used to calculate the state root.
	state.SyncObjects()
	if header.Root != state.Root() {
		err = fmt.Errorf("invalid merkle root. received=%x got=%x", header.Root, state.Root())
		return
	}

	// Sync the current block's state to the database
	state.Sync()

	return state.Logs(), receipts, nil
}

func blockErr(block *types.Block, err error) {
	h := block.Header()
	glog.V(logger.Error).Infof("Bad block #%v (%x)\n", h.Number, h.Hash().Bytes())
	glog.V(logger.Error).Infoln(err)
	glog.V(logger.Debug).Infoln(verifyNonces)
}