laconicd/app/ante/ante.go

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package ante
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import (
sdk "github.com/cosmos/cosmos-sdk/types"
sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
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"github.com/cosmos/cosmos-sdk/x/auth"
authante "github.com/cosmos/cosmos-sdk/x/auth/ante"
"github.com/cosmos/cosmos-sdk/x/auth/keeper"
"github.com/cosmos/cosmos-sdk/x/auth/types"
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"github.com/cosmos/ethermint/crypto/ethsecp256k1"
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evmtypes "github.com/cosmos/ethermint/x/evm/types"
tmcrypto "github.com/tendermint/tendermint/crypto"
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)
func init() {
ethsecp256k1.RegisterCodec(types.ModuleCdc)
}
const (
// TODO: Use this cost per byte through parameter or overriding NewConsumeGasForTxSizeDecorator
// which currently defaults at 10, if intended
// memoCostPerByte sdk.Gas = 3
secp256k1VerifyCost uint64 = 21000
)
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// NewAnteHandler returns an ante handler responsible for attempting to route an
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// Ethereum or SDK transaction to an internal ante handler for performing
// transaction-level processing (e.g. fee payment, signature verification) before
// being passed onto it's respective handler.
func NewAnteHandler(ak auth.AccountKeeper, evmKeeper EVMKeeper, sk types.SupplyKeeper) sdk.AnteHandler {
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return func(
ctx sdk.Context, tx sdk.Tx, sim bool,
) (newCtx sdk.Context, err error) {
var anteHandler sdk.AnteHandler
switch tx.(type) {
case auth.StdTx:
anteHandler = sdk.ChainAnteDecorators(
authante.NewSetUpContextDecorator(), // outermost AnteDecorator. SetUpContext must be called first
NewAccountSetupDecorator(ak),
authante.NewMempoolFeeDecorator(),
authante.NewValidateBasicDecorator(),
authante.NewValidateMemoDecorator(ak),
authante.NewConsumeGasForTxSizeDecorator(ak),
authante.NewSetPubKeyDecorator(ak), // SetPubKeyDecorator must be called before all signature verification decorators
authante.NewValidateSigCountDecorator(ak),
authante.NewDeductFeeDecorator(ak, sk),
authante.NewSigGasConsumeDecorator(ak, sigGasConsumer),
authante.NewSigVerificationDecorator(ak),
authante.NewIncrementSequenceDecorator(ak), // innermost AnteDecorator
)
case evmtypes.MsgEthereumTx:
anteHandler = sdk.ChainAnteDecorators(
NewEthSetupContextDecorator(), // outermost AnteDecorator. EthSetUpContext must be called first
NewEthMempoolFeeDecorator(evmKeeper),
authante.NewValidateBasicDecorator(),
NewEthSigVerificationDecorator(),
NewAccountVerificationDecorator(ak, evmKeeper),
NewNonceVerificationDecorator(ak),
NewEthGasConsumeDecorator(ak, sk, evmKeeper),
NewIncrementSenderSequenceDecorator(ak), // innermost AnteDecorator.
)
default:
return ctx, sdkerrors.Wrapf(sdkerrors.ErrUnknownRequest, "invalid transaction type: %T", tx)
}
return anteHandler(ctx, tx, sim)
}
}
// sigGasConsumer overrides the DefaultSigVerificationGasConsumer from the x/auth
// module on the SDK. It doesn't allow ed25519 nor multisig thresholds.
func sigGasConsumer(
meter sdk.GasMeter, _ []byte, pubkey tmcrypto.PubKey, _ types.Params,
) error {
switch pubkey.(type) {
case ethsecp256k1.PubKey:
meter.ConsumeGas(secp256k1VerifyCost, "ante verify: secp256k1")
return nil
case tmcrypto.PubKey:
meter.ConsumeGas(secp256k1VerifyCost, "ante verify: tendermint secp256k1")
return nil
default:
return sdkerrors.Wrapf(sdkerrors.ErrInvalidPubKey, "unrecognized public key type: %T", pubkey)
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}
}
// AccountSetupDecorator sets an account to state if it's not stored already. This only applies for MsgEthermint.
type AccountSetupDecorator struct {
ak auth.AccountKeeper
}
// NewAccountSetupDecorator creates a new AccountSetupDecorator instance
func NewAccountSetupDecorator(ak auth.AccountKeeper) AccountSetupDecorator {
return AccountSetupDecorator{
ak: ak,
}
}
// AnteHandle sets an account for MsgEthermint (evm) if the sender is registered.
// NOTE: Since the account is set without any funds, the message execution will
// fail if the validator requires a minimum fee > 0.
func (asd AccountSetupDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simulate bool, next sdk.AnteHandler) (sdk.Context, error) {
msgs := tx.GetMsgs()
if len(msgs) == 0 {
return ctx, sdkerrors.Wrap(sdkerrors.ErrUnknownRequest, "no messages included in transaction")
}
for _, msg := range msgs {
if msgEthermint, ok := msg.(evmtypes.MsgEthermint); ok {
setupAccount(asd.ak, ctx, msgEthermint.From)
}
}
return next(ctx, tx, simulate)
}
func setupAccount(ak keeper.AccountKeeper, ctx sdk.Context, addr sdk.AccAddress) {
acc := ak.GetAccount(ctx, addr)
if acc != nil {
return
}
acc = ak.NewAccountWithAddress(ctx, addr)
ak.SetAccount(ctx, acc)
}