status-go/transactions/rpc_wrapper.go

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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"
gethtypes "github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/rlp"
2020-01-02 09:10:19 +00:00
"github.com/status-im/status-go/eth-node/types"
"github.com/status-im/status-go/rpc"
)
// rpcWrapper wraps provides convenient interface for ethereum RPC APIs we need for sending transactions
type rpcWrapper struct {
rpcClient *rpc.Client
}
func newRPCWrapper(client *rpc.Client) *rpcWrapper {
return &rpcWrapper{rpcClient: 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 (w *rpcWrapper) PendingNonceAt(ctx context.Context, account common.Address) (uint64, error) {
var result hexutil.Uint64
err := w.rpcClient.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 (w *rpcWrapper) SuggestGasPrice(ctx context.Context) (*big.Int, error) {
var hex hexutil.Big
if err := w.rpcClient.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 (w *rpcWrapper) EstimateGas(ctx context.Context, msg ethereum.CallMsg) (uint64, error) {
var hex hexutil.Uint64
err := w.rpcClient.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 (w *rpcWrapper) SendTransaction(ctx context.Context, tx *gethtypes.Transaction) error {
data, err := rlp.EncodeToBytes(tx)
if err != nil {
return err
}
return w.rpcClient.CallContext(ctx, nil, "eth_sendRawTransaction", types.EncodeHex(data))
}
func toCallArg(msg ethereum.CallMsg) interface{} {
arg := map[string]interface{}{
"from": msg.From,
"to": msg.To,
}
if len(msg.Data) > 0 {
arg["data"] = types.HexBytes(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
}