laconicd/rpc/ethereum/backend/utils.go

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package backend
import (
"bytes"
"errors"
"math/big"
"github.com/cosmos/cosmos-sdk/codec"
sdk "github.com/cosmos/cosmos-sdk/types"
authtypes "github.com/cosmos/cosmos-sdk/x/auth/types"
"github.com/ethereum/go-ethereum/common"
ethtypes "github.com/ethereum/go-ethereum/core/types"
abci "github.com/tendermint/tendermint/abci/types"
"github.com/tendermint/tendermint/libs/log"
"github.com/ethereum/go-ethereum/common/hexutil"
"github.com/tharsis/ethermint/rpc/ethereum/types"
evmtypes "github.com/tharsis/ethermint/x/evm/types"
)
// setTxDefaults populates tx message with default values in case they are not
// provided on the args
func (e *EVMBackend) setTxDefaults(args types.SendTxArgs) (types.SendTxArgs, error) {
if args.GasPrice == nil {
// TODO: Suggest a gas price based on the previous included txs
args.GasPrice = (*hexutil.Big)(new(big.Int).SetInt64(e.RPCMinGasPrice()))
}
if args.Nonce == nil {
// get the nonce from the account retriever
// ignore error in case tge account doesn't exist yet
nonce, _ := e.getAccountNonce(args.From, true, 0, e.logger)
args.Nonce = (*hexutil.Uint64)(&nonce)
}
if args.Data != nil && args.Input != nil && !bytes.Equal(*args.Data, *args.Input) {
return args, errors.New("both 'data' and 'input' are set and not equal. Please use 'input' to pass transaction call data")
}
if args.To == nil {
// Contract creation
var input []byte
if args.Data != nil {
input = *args.Data
} else if args.Input != nil {
input = *args.Input
}
if len(input) == 0 {
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return args, errors.New("contract creation without any data provided")
}
}
if args.Gas == nil {
// For backwards-compatibility reason, we try both input and data
// but input is preferred.
input := args.Input
if input == nil {
input = args.Data
}
callArgs := evmtypes.CallArgs{
From: &args.From, // From shouldn't be nil
To: args.To,
Gas: args.Gas,
GasPrice: args.GasPrice,
Value: args.Value,
Data: input,
AccessList: args.AccessList,
}
blockNr := types.NewBlockNumber(big.NewInt(0))
estimated, err := e.EstimateGas(callArgs, &blockNr)
if err != nil {
return args, err
}
args.Gas = &estimated
e.logger.Debug("estimate gas usage automatically", "gas", args.Gas)
}
if args.ChainID == nil {
args.ChainID = (*hexutil.Big)(e.chainID)
}
return args, nil
}
// getAccountNonce returns the account nonce for the given account address.
// If the pending value is true, it will iterate over the mempool (pending)
// txs in order to compute and return the pending tx sequence.
// Todo: include the ability to specify a blockNumber
func (e *EVMBackend) getAccountNonce(accAddr common.Address, pending bool, height int64, logger log.Logger) (uint64, error) {
queryClient := authtypes.NewQueryClient(e.clientCtx)
res, err := queryClient.Account(types.ContextWithHeight(height), &authtypes.QueryAccountRequest{Address: sdk.AccAddress(accAddr.Bytes()).String()})
if err != nil {
return 0, err
}
var acc authtypes.AccountI
if err := e.clientCtx.InterfaceRegistry.UnpackAny(res.Account, &acc); err != nil {
return 0, err
}
nonce := acc.GetSequence()
if !pending {
return nonce, nil
}
// the account retriever doesn't include the uncommitted transactions on the nonce so we need to
// to manually add them.
pendingTxs, err := e.PendingTransactions()
if err != nil {
logger.Error("failed to fetch pending transactions", "error", err.Error())
return nonce, nil
}
// add the uncommitted txs to the nonce counter
// only supports `MsgEthereumTx` style tx
for _, tx := range pendingTxs {
msg, err := evmtypes.UnwrapEthereumMsg(tx)
if err != nil {
// not ethereum tx
continue
}
sender, err := msg.GetSender(e.chainID)
if err != nil {
continue
}
if sender == accAddr {
nonce++
}
}
return nonce, nil
}
// TxLogsFromEvents parses ethereum logs from cosmos events
func TxLogsFromEvents(codec codec.Codec, events []abci.Event) []*ethtypes.Log {
logs := make([]*evmtypes.Log, 0)
for _, event := range events {
if event.Type != evmtypes.EventTypeTxLog {
continue
}
for _, attr := range event.Attributes {
if !bytes.Equal(attr.Key, []byte(evmtypes.AttributeKeyTxLog)) {
continue
}
var log evmtypes.Log
codec.MustUnmarshal(attr.Value, &log)
logs = append(logs, &log)
}
}
return evmtypes.LogsToEthereum(logs)
}