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transaction_args.go
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transaction_args.go
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// Copyright 2021 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package ethapi
import (
"bytes"
"context"
"errors"
"fmt"
"math/big"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/hexutil"
"github.com/ethereum/go-ethereum/common/math"
"github.com/ethereum/go-ethereum/core"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/rpc"
)
// TransactionArgs represents the arguments to construct a new transaction
// or a message call.
type TransactionArgs struct {
From *common.Address `json:"from"`
To *common.Address `json:"to"`
Gas *hexutil.Uint64 `json:"gas"`
GasPrice *hexutil.Big `json:"gasPrice"`
MaxFeePerGas *hexutil.Big `json:"maxFeePerGas"`
MaxPriorityFeePerGas *hexutil.Big `json:"maxPriorityFeePerGas"`
Value *hexutil.Big `json:"value"`
Nonce *hexutil.Uint64 `json:"nonce"`
// We accept "data" and "input" for backwards-compatibility reasons.
// "input" is the newer name and should be preferred by clients.
// Issue detail: https://github.com/ethereum/go-ethereum/issues/15628
Data *hexutil.Bytes `json:"data"`
Input *hexutil.Bytes `json:"input"`
// Introduced by AccessListTxType transaction.
AccessList *types.AccessList `json:"accessList,omitempty"`
ChainID *hexutil.Big `json:"chainId,omitempty"`
}
// from retrieves the transaction sender address.
func (args *TransactionArgs) from() common.Address {
if args.From == nil {
return common.Address{}
}
return *args.From
}
// data retrieves the transaction calldata. Input field is preferred.
func (args *TransactionArgs) data() []byte {
if args.Input != nil {
return *args.Input
}
if args.Data != nil {
return *args.Data
}
return nil
}
// setDefaults fills in default values for unspecified tx fields.
func (args *TransactionArgs) setDefaults(ctx context.Context, b Backend) error {
if err := args.setFeeDefaults(ctx, b); err != nil {
return err
}
if args.Value == nil {
args.Value = new(hexutil.Big)
}
if args.Nonce == nil {
nonce, err := b.GetPoolNonce(ctx, args.from())
if err != nil {
return err
}
args.Nonce = (*hexutil.Uint64)(&nonce)
}
if args.Data != nil && args.Input != nil && !bytes.Equal(*args.Data, *args.Input) {
return errors.New(`both "data" and "input" are set and not equal. Please use "input" to pass transaction call data`)
}
if args.To == nil && len(args.data()) == 0 {
return errors.New(`contract creation without any data provided`)
}
// Estimate the gas usage if necessary.
if args.Gas == nil {
// These fields are immutable during the estimation, safe to
// pass the pointer directly.
data := args.data()
callArgs := TransactionArgs{
From: args.From,
To: args.To,
GasPrice: args.GasPrice,
MaxFeePerGas: args.MaxFeePerGas,
MaxPriorityFeePerGas: args.MaxPriorityFeePerGas,
Value: args.Value,
Data: (*hexutil.Bytes)(&data),
AccessList: args.AccessList,
}
pendingBlockNr := rpc.BlockNumberOrHashWithNumber(rpc.PendingBlockNumber)
estimated, err := DoEstimateGas(ctx, b, callArgs, pendingBlockNr, b.RPCGasCap())
if err != nil {
return err
}
args.Gas = &estimated
log.Trace("Estimate gas usage automatically", "gas", args.Gas)
}
// If chain id is provided, ensure it matches the local chain id. Otherwise, set the local
// chain id as the default.
want := b.ChainConfig().ChainID
if args.ChainID != nil {
if have := (*big.Int)(args.ChainID); have.Cmp(want) != 0 {
return fmt.Errorf("chainId does not match node's (have=%v, want=%v)", have, want)
}
} else {
args.ChainID = (*hexutil.Big)(want)
}
return nil
}
// setFeeDefaults fills in default fee values for unspecified tx fields.
func (args *TransactionArgs) setFeeDefaults(ctx context.Context, b Backend) error {
// If both gasPrice and at least one of the EIP-1559 fee parameters are specified, error.
if args.GasPrice != nil && (args.MaxFeePerGas != nil || args.MaxPriorityFeePerGas != nil) {
return errors.New("both gasPrice and (maxFeePerGas or maxPriorityFeePerGas) specified")
}
// If the tx has completely specified a fee mechanism, no default is needed. This allows users
// who are not yet synced past London to get defaults for other tx values. See
// https://github.com/ethereum/go-ethereum/pull/23274 for more information.
eip1559ParamsSet := args.MaxFeePerGas != nil && args.MaxPriorityFeePerGas != nil
if (args.GasPrice != nil && !eip1559ParamsSet) || (args.GasPrice == nil && eip1559ParamsSet) {
// Sanity check the EIP-1559 fee parameters if present.
if args.GasPrice == nil && args.MaxFeePerGas.ToInt().Cmp(args.MaxPriorityFeePerGas.ToInt()) < 0 {
return fmt.Errorf("maxFeePerGas (%v) < maxPriorityFeePerGas (%v)", args.MaxFeePerGas, args.MaxPriorityFeePerGas)
}
return nil
}
// Now attempt to fill in default value depending on whether London is active or not.
head := b.CurrentHeader()
if b.ChainConfig().IsLondon(head.Number) {
// London is active, set maxPriorityFeePerGas and maxFeePerGas.
if err := args.setLondonFeeDefaults(ctx, head, b); err != nil {
return err
}
} else {
if args.MaxFeePerGas != nil || args.MaxPriorityFeePerGas != nil {
return errors.New("maxFeePerGas and maxPriorityFeePerGas are not valid before London is active")
}
// London not active, set gas price.
price, err := b.SuggestGasTipCap(ctx)
if err != nil {
return err
}
args.GasPrice = (*hexutil.Big)(price)
}
return nil
}
// setLondonFeeDefaults fills in reasonable default fee values for unspecified fields.
func (args *TransactionArgs) setLondonFeeDefaults(ctx context.Context, head *types.Header, b Backend) error {
// Set maxPriorityFeePerGas if it is missing.
if args.MaxPriorityFeePerGas == nil {
tip, err := b.SuggestGasTipCap(ctx)
if err != nil {
return err
}
args.MaxPriorityFeePerGas = (*hexutil.Big)(tip)
}
// Set maxFeePerGas if it is missing.
if args.MaxFeePerGas == nil {
// Set the max fee to be 2 times larger than the previous block's base fee.
// The additional slack allows the tx to not become invalidated if the base
// fee is rising.
val := new(big.Int).Add(
args.MaxPriorityFeePerGas.ToInt(),
new(big.Int).Mul(head.BaseFee, big.NewInt(2)),
)
args.MaxFeePerGas = (*hexutil.Big)(val)
}
// Both EIP-1559 fee parameters are now set; sanity check them.
if args.MaxFeePerGas.ToInt().Cmp(args.MaxPriorityFeePerGas.ToInt()) < 0 {
return fmt.Errorf("maxFeePerGas (%v) < maxPriorityFeePerGas (%v)", args.MaxFeePerGas, args.MaxPriorityFeePerGas)
}
return nil
}
// ToMessage converts the transaction arguments to the Message type used by the
// core evm. This method is used in calls and traces that do not require a real
// live transaction.
func (args *TransactionArgs) ToMessage(globalGasCap uint64, baseFee *big.Int) (*core.Message, error) {
// Reject invalid combinations of pre- and post-1559 fee styles
if args.GasPrice != nil && (args.MaxFeePerGas != nil || args.MaxPriorityFeePerGas != nil) {
return nil, errors.New("both gasPrice and (maxFeePerGas or maxPriorityFeePerGas) specified")
}
// Set sender address or use zero address if none specified.
addr := args.from()
// Set default gas & gas price if none were set
gas := globalGasCap
if gas == 0 {
gas = uint64(math.MaxUint64 / 2)
}
if args.Gas != nil {
gas = uint64(*args.Gas)
}
if globalGasCap != 0 && globalGasCap < gas {
log.Warn("Caller gas above allowance, capping", "requested", gas, "cap", globalGasCap)
gas = globalGasCap
}
var (
gasPrice *big.Int
gasFeeCap *big.Int
gasTipCap *big.Int
)
if baseFee == nil {
// If there's no basefee, then it must be a non-1559 execution
gasPrice = new(big.Int)
if args.GasPrice != nil {
gasPrice = args.GasPrice.ToInt()
}
gasFeeCap, gasTipCap = gasPrice, gasPrice
} else {
// A basefee is provided, necessitating 1559-type execution
if args.GasPrice != nil {
// User specified the legacy gas field, convert to 1559 gas typing
gasPrice = args.GasPrice.ToInt()
gasFeeCap, gasTipCap = gasPrice, gasPrice
} else {
// User specified 1559 gas fields (or none), use those
gasFeeCap = new(big.Int)
if args.MaxFeePerGas != nil {
gasFeeCap = args.MaxFeePerGas.ToInt()
}
gasTipCap = new(big.Int)
if args.MaxPriorityFeePerGas != nil {
gasTipCap = args.MaxPriorityFeePerGas.ToInt()
}
// Backfill the legacy gasPrice for EVM execution, unless we're all zeroes
gasPrice = new(big.Int)
if gasFeeCap.BitLen() > 0 || gasTipCap.BitLen() > 0 {
gasPrice = math.BigMin(new(big.Int).Add(gasTipCap, baseFee), gasFeeCap)
}
}
}
value := new(big.Int)
if args.Value != nil {
value = args.Value.ToInt()
}
data := args.data()
var accessList types.AccessList
if args.AccessList != nil {
accessList = *args.AccessList
}
msg := &core.Message{
From: addr,
To: args.To,
Value: value,
GasLimit: gas,
GasPrice: gasPrice,
GasFeeCap: gasFeeCap,
GasTipCap: gasTipCap,
Data: data,
AccessList: accessList,
SkipAccountChecks: true,
}
return msg, nil
}
// toTransaction converts the arguments to a transaction.
// This assumes that setDefaults has been called.
func (args *TransactionArgs) toTransaction() *types.Transaction {
var data types.TxData
switch {
case args.MaxFeePerGas != nil:
al := types.AccessList{}
if args.AccessList != nil {
al = *args.AccessList
}
data = &types.DynamicFeeTx{
To: args.To,
ChainID: (*big.Int)(args.ChainID),
Nonce: uint64(*args.Nonce),
Gas: uint64(*args.Gas),
GasFeeCap: (*big.Int)(args.MaxFeePerGas),
GasTipCap: (*big.Int)(args.MaxPriorityFeePerGas),
Value: (*big.Int)(args.Value),
Data: args.data(),
AccessList: al,
}
case args.AccessList != nil:
data = &types.AccessListTx{
To: args.To,
ChainID: (*big.Int)(args.ChainID),
Nonce: uint64(*args.Nonce),
Gas: uint64(*args.Gas),
GasPrice: (*big.Int)(args.GasPrice),
Value: (*big.Int)(args.Value),
Data: args.data(),
AccessList: *args.AccessList,
}
default:
data = &types.LegacyTx{
To: args.To,
Nonce: uint64(*args.Nonce),
Gas: uint64(*args.Gas),
GasPrice: (*big.Int)(args.GasPrice),
Value: (*big.Int)(args.Value),
Data: args.data(),
}
}
return types.NewTx(data)
}
// ToTransaction converts the arguments to a transaction.
// This assumes that setDefaults has been called.
func (args *TransactionArgs) ToTransaction() *types.Transaction {
return args.toTransaction()
}