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