status-go/geth/transactions/ethtxclient.go

95 lines
3.0 KiB
Go

package transactions
import (
"context"
"math/big"
ethereum "github.com/ethereum/go-ethereum"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/hexutil"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/rlp"
"github.com/status-im/status-go/geth/rpc"
)
// EthTransactor provides methods to create transactions for ethereum network.
type EthTransactor interface {
PendingNonceAt(ctx context.Context, account common.Address) (uint64, error)
ethereum.GasEstimator
ethereum.GasPricer
ethereum.TransactionSender
}
// EthTxClient wraps common API methods that are used to send transaction.
type EthTxClient struct {
c *rpc.Client
}
// NewEthTxClient returns a new EthTxClient for client
func NewEthTxClient(client *rpc.Client) *EthTxClient {
return &EthTxClient{c: client}
}
// PendingNonceAt returns the account nonce of the given account in the pending state.
// This is the nonce that should be used for the next transaction.
func (ec *EthTxClient) PendingNonceAt(ctx context.Context, account common.Address) (uint64, error) {
var result hexutil.Uint64
err := ec.c.CallContext(ctx, &result, "eth_getTransactionCount", account, "pending")
return uint64(result), err
}
// SuggestGasPrice retrieves the currently suggested gas price to allow a timely
// execution of a transaction.
func (ec *EthTxClient) SuggestGasPrice(ctx context.Context) (*big.Int, error) {
var hex hexutil.Big
if err := ec.c.CallContext(ctx, &hex, "eth_gasPrice"); err != nil {
return nil, err
}
return (*big.Int)(&hex), nil
}
// EstimateGas tries to estimate the gas needed to execute a specific transaction based on
// the current pending state of the backend blockchain. There is no guarantee that this is
// the true gas limit requirement as other transactions may be added or removed by miners,
// but it should provide a basis for setting a reasonable default.
func (ec *EthTxClient) EstimateGas(ctx context.Context, msg ethereum.CallMsg) (uint64, error) {
var hex hexutil.Uint64
err := ec.c.CallContext(ctx, &hex, "eth_estimateGas", toCallArg(msg))
if err != nil {
return 0, err
}
return uint64(hex), nil
}
// SendTransaction injects a signed transaction into the pending pool for execution.
//
// If the transaction was a contract creation use the TransactionReceipt method to get the
// contract address after the transaction has been mined.
func (ec *EthTxClient) SendTransaction(ctx context.Context, tx *types.Transaction) error {
data, err := rlp.EncodeToBytes(tx)
if err != nil {
return err
}
return ec.c.CallContext(ctx, nil, "eth_sendRawTransaction", common.ToHex(data))
}
func toCallArg(msg ethereum.CallMsg) interface{} {
arg := map[string]interface{}{
"from": msg.From,
"to": msg.To,
}
if len(msg.Data) > 0 {
arg["data"] = hexutil.Bytes(msg.Data)
}
if msg.Value != nil {
arg["value"] = (*hexutil.Big)(msg.Value)
}
if msg.Gas != 0 {
arg["gas"] = hexutil.Uint64(msg.Gas)
}
if msg.GasPrice != nil {
arg["gasPrice"] = (*hexutil.Big)(msg.GasPrice)
}
return arg
}