94 lines
3.1 KiB
Go
94 lines
3.1 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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gethtypes "github.com/ethereum/go-ethereum/core/types"
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"github.com/status-im/status-go/eth-node/types"
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"github.com/status-im/status-go/rpc"
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)
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// rpcWrapper wraps provides convenient interface for ethereum RPC APIs we need for sending transactions
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type rpcWrapper struct {
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RPCClient rpc.ClientInterface
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chainID uint64
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}
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func newRPCWrapper(client rpc.ClientInterface, chainID uint64) *rpcWrapper {
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return &rpcWrapper{RPCClient: client, chainID: chainID}
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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 (w *rpcWrapper) PendingNonceAt(ctx context.Context, account common.Address) (uint64, error) {
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var result hexutil.Uint64
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err := w.RPCClient.CallContext(ctx, &result, w.chainID, "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 (w *rpcWrapper) SuggestGasPrice(ctx context.Context) (*big.Int, error) {
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var hex hexutil.Big
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if err := w.RPCClient.CallContext(ctx, &hex, w.chainID, "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 (w *rpcWrapper) EstimateGas(ctx context.Context, msg ethereum.CallMsg) (uint64, error) {
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var hex hexutil.Uint64
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err := w.RPCClient.CallContext(ctx, &hex, w.chainID, "eth_estimateGas", toCallArg(msg))
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if err != nil {
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return 0, err
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}
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return uint64(hex), nil
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}
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// Does the `eth_sendRawTransaction` call with the given raw transaction hex string.
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func (w *rpcWrapper) SendRawTransaction(ctx context.Context, rawTx string) error {
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return w.RPCClient.CallContext(ctx, nil, w.chainID, "eth_sendRawTransaction", rawTx)
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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 (w *rpcWrapper) SendTransaction(ctx context.Context, tx *gethtypes.Transaction) error {
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data, err := tx.MarshalBinary()
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if err != nil {
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return err
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}
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return w.SendRawTransaction(ctx, types.EncodeHex(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"] = types.HexBytes(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 != 0 {
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arg["gas"] = hexutil.Uint64(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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