impr: support batch eth txs (#901)

* support batch eth tx

Closes: 896

Allow multiple MsgEthereumTx in single tx

* fix transaction receipt api

* fix tx receipt api and accumulate tx gas used

* fix lint

* fix test

* fix rpc test

* cleanup

* fix cumulativeGasUsed and gasUsed

* fix lint

* Update app/ante/eth.go

Co-authored-by: Federico Kunze Küllmer <31522760+fedekunze@users.noreply.github.com>

* Update app/ante/eth.go

Co-authored-by: Federico Kunze Küllmer <31522760+fedekunze@users.noreply.github.com>

* Update rpc/ethereum/backend/utils.go

Co-authored-by: Federico Kunze Küllmer <31522760+fedekunze@users.noreply.github.com>

* pr suggestions

* typo

* fix lint

Co-authored-by: Federico Kunze Küllmer <31522760+fedekunze@users.noreply.github.com>

x/evm/keeper/keeper.go

@@ -6,6 +6,7 @@ import (
 	"github.com/cosmos/cosmos-sdk/codec"
 	"github.com/cosmos/cosmos-sdk/store/prefix"
 	sdk "github.com/cosmos/cosmos-sdk/types"
+	sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
 	paramtypes "github.com/cosmos/cosmos-sdk/x/params/types"
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core"
@@ -301,3 +302,36 @@ func (k Keeper) BaseFee(ctx sdk.Context, ethCfg *params.ChainConfig) *big.Int {
 	}
 	return baseFee
 }
+
+// ResetTransientGasUsed reset gas used to prepare for execution of current cosmos tx, called in ante handler.
+func (k Keeper) ResetTransientGasUsed(ctx sdk.Context) {
+	store := ctx.TransientStore(k.transientKey)
+	store.Delete(types.KeyPrefixTransientGasUsed)
+}
+
+// GetTransientGasUsed returns the gas used by current cosmos tx.
+func (k Keeper) GetTransientGasUsed(ctx sdk.Context) uint64 {
+	store := ctx.TransientStore(k.transientKey)
+	bz := store.Get(types.KeyPrefixTransientGasUsed)
+	if len(bz) == 0 {
+		return 0
+	}
+	return sdk.BigEndianToUint64(bz)
+}
+
+// SetTransientGasUsed sets the gas used by current cosmos tx.
+func (k Keeper) SetTransientGasUsed(ctx sdk.Context, gasUsed uint64) {
+	store := ctx.TransientStore(k.transientKey)
+	bz := sdk.Uint64ToBigEndian(gasUsed)
+	store.Set(types.KeyPrefixTransientGasUsed, bz)
+}
+
+// AddTransientGasUsed accumulate gas used by each eth msgs included in current cosmos tx.
+func (k Keeper) AddTransientGasUsed(ctx sdk.Context, gasUsed uint64) (uint64, error) {
+	result := k.GetTransientGasUsed(ctx) + gasUsed
+	if result < gasUsed {
+		return 0, sdkerrors.Wrap(types.ErrGasOverflow, "transient gas used")
+	}
+	k.SetTransientGasUsed(ctx, result)
+	return result, nil
+}

x/evm/keeper/msg_server.go

@@ -38,7 +38,9 @@ func (k *Keeper) EthereumTx(goCtx context.Context, msg *types.MsgEthereumTx) (*t
 		// add event for ethereum transaction hash format
 		sdk.NewAttribute(types.AttributeKeyEthereumTxHash, response.Hash),
 		// add event for index of valid ethereum tx
-		sdk.NewAttribute(types.AttributeKeyTxIndex, strconv.FormatInt(int64(txIndex), 10)),
+		sdk.NewAttribute(types.AttributeKeyTxIndex, strconv.FormatUint(txIndex, 10)),
+		// add event for eth tx gas used, we can't get it from cosmos tx result when it contains multiple eth tx msgs.
+		sdk.NewAttribute(types.AttributeKeyTxGasUsed, strconv.FormatUint(response.GasUsed, 10)),
 	}
 
 	if len(ctx.TxBytes()) > 0 {

x/evm/keeper/state_transition.go

@@ -287,8 +287,13 @@ func (k *Keeper) ApplyTransaction(ctx sdk.Context, tx *ethtypes.Transaction) (*t
 
 	k.SetTxIndexTransient(ctx, uint64(txConfig.TxIndex)+1)
 
-	// update the gas used after refund
-	k.ResetGasMeterAndConsumeGas(ctx, res.GasUsed)
+	totalGasUsed, err := k.AddTransientGasUsed(ctx, res.GasUsed)
+	if err != nil {
+		return nil, sdkerrors.Wrap(err, "failed to add transient gas used")
+	}
+
+	// reset the gas meter for current cosmos transaction
+	k.ResetGasMeterAndConsumeGas(ctx, totalGasUsed)
 	return res, nil
 }