Golang Transaction.Cost方法代码示例

// validateTx checks whether a transaction is valid according
// to the consensus rules.
func (pool *TxPool) validateTx(tx *types.Transaction) error {
	// Validate sender
	var (
		from common.Address
		err  error
	)

	// Drop transactions under our own minimal accepted gas price
	if pool.minGasPrice.Cmp(tx.GasPrice()) > 0 {
		return ErrCheap
	}

	// Validate the transaction sender and it's sig. Throw
	// if the from fields is invalid.
	if from, err = tx.From(); err != nil {
		return ErrInvalidSender
	}

	// Make sure the account exist. Non existent accounts
	// haven't got funds and well therefor never pass.
	currentState, err := pool.currentState()
	if err != nil {
		return err
	}
	if !currentState.HasAccount(from) {
		return ErrNonExistentAccount
	}

	// Last but not least check for nonce errors
	if currentState.GetNonce(from) > tx.Nonce() {
		return ErrNonce
	}

	// Check the transaction doesn't exceed the current
	// block limit gas.
	if pool.gasLimit().Cmp(tx.Gas()) < 0 {
		return ErrGasLimit
	}

	// Transactions can't be negative. This may never happen
	// using RLP decoded transactions but may occur if you create
	// a transaction using the RPC for example.
	if tx.Value().Cmp(common.Big0) < 0 {
		return ErrNegativeValue
	}

	// Transactor should have enough funds to cover the costs
	// cost == V + GP * GL
	if currentState.GetBalance(from).Cmp(tx.Cost()) < 0 {
		return ErrInsufficientFunds
	}

	// Should supply enough intrinsic gas
	if tx.Gas().Cmp(IntrinsicGas(tx.Data())) < 0 {
		return ErrIntrinsicGas
	}

	return nil
}

// validateTx checks whether a transaction is valid according
// to the consensus rules.
func (pool *TxPool) validateTx(tx *types.Transaction) error {
	local := pool.localTx.contains(tx.Hash())
	// Drop transactions under our own minimal accepted gas price
	if !local && pool.minGasPrice.Cmp(tx.GasPrice()) > 0 {
		return ErrCheap
	}

	currentState, err := pool.currentState()
	if err != nil {
		return err
	}

	from, err := tx.From()
	if err != nil {
		return ErrInvalidSender
	}

	// Make sure the account exist. Non existent accounts
	// haven't got funds and well therefor never pass.
	if !currentState.Exist(from) {
		return ErrNonExistentAccount
	}

	// Last but not least check for nonce errors
	if currentState.GetNonce(from) > tx.Nonce() {
		return ErrNonce
	}

	// Check the transaction doesn't exceed the current
	// block limit gas.
	if pool.gasLimit().Cmp(tx.Gas()) < 0 {
		return ErrGasLimit
	}

	// Transactions can't be negative. This may never happen
	// using RLP decoded transactions but may occur if you create
	// a transaction using the RPC for example.
	if tx.Value().Cmp(common.Big0) < 0 {
		return ErrNegativeValue
	}

	// Transactor should have enough funds to cover the costs
	// cost == V + GP * GL
	if currentState.GetBalance(from).Cmp(tx.Cost()) < 0 {
		return ErrInsufficientFunds
	}

	intrGas := IntrinsicGas(tx.Data(), MessageCreatesContract(tx), pool.homestead)
	if tx.Gas().Cmp(intrGas) < 0 {
		return ErrIntrinsicGas
	}

	return nil
}

// Add tries to insert a new transaction into the list, returning whether the
// transaction was accepted, and if yes, any previous transaction it replaced.
//
// If the new transaction is accepted into the list, the lists' cost threshold
// is also potentially updated.
func (l *txList) Add(tx *types.Transaction) (bool, *types.Transaction) {
	// If there's an older better transaction, abort
	old := l.txs.Get(tx.Nonce())
	if old != nil && old.GasPrice().Cmp(tx.GasPrice()) >= 0 {
		return false, nil
	}
	// Otherwise overwrite the old transaction with the current one
	l.txs.Put(tx)
	if cost := tx.Cost(); l.costcap.Cmp(cost) < 0 {
		l.costcap = cost
	}
	return true, old
}