362 lines
12 KiB
Go
362 lines
12 KiB
Go
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package ante
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import (
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"fmt"
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"math/big"
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sdk "github.com/cosmos/cosmos-sdk/types"
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sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
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"github.com/cosmos/cosmos-sdk/x/auth"
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authante "github.com/cosmos/cosmos-sdk/x/auth/ante"
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"github.com/cosmos/cosmos-sdk/x/auth/types"
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emint "github.com/cosmos/ethermint/types"
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evmtypes "github.com/cosmos/ethermint/x/evm/types"
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ethcore "github.com/ethereum/go-ethereum/core"
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)
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// EthSetupContextDecorator sets the infinite GasMeter in the Context and wraps
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// the next AnteHandler with a defer clause to recover from any downstream
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// OutOfGas panics in the AnteHandler chain to return an error with information
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// on gas provided and gas used.
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// CONTRACT: Must be first decorator in the chain
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// CONTRACT: Tx must implement GasTx interface
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type EthSetupContextDecorator struct{}
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// NewEthSetupContextDecorator creates a new EthSetupContextDecorator
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func NewEthSetupContextDecorator() EthSetupContextDecorator {
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return EthSetupContextDecorator{}
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}
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// AnteHandle sets the infinite gas meter to done to ignore costs in AnteHandler checks.
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// This is undone at the EthGasConsumeDecorator, where the context is set with the
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// ethereum tx GasLimit.
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func (escd EthSetupContextDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simulate bool, next sdk.AnteHandler) (newCtx sdk.Context, err error) {
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ctx = ctx.WithBlockGasMeter(sdk.NewInfiniteGasMeter())
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// all transactions must implement GasTx
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gasTx, ok := tx.(authante.GasTx)
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if !ok {
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return ctx, sdkerrors.Wrap(sdkerrors.ErrTxDecode, "Tx must be GasTx")
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}
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// Decorator will catch an OutOfGasPanic caused in the next antehandler
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// AnteHandlers must have their own defer/recover in order for the BaseApp
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// to know how much gas was used! This is because the GasMeter is created in
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// the AnteHandler, but if it panics the context won't be set properly in
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// runTx's recover call.
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defer func() {
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if r := recover(); r != nil {
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switch rType := r.(type) {
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case sdk.ErrorOutOfGas:
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log := fmt.Sprintf(
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"out of gas in location: %v; gasLimit: %d, gasUsed: %d",
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rType.Descriptor, gasTx.GetGas(), ctx.GasMeter().GasConsumed(),
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)
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err = sdkerrors.Wrap(sdkerrors.ErrOutOfGas, log)
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default:
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panic(r)
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}
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}
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}()
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return next(ctx, tx, simulate)
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}
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// EthMempoolFeeDecorator validates that sufficient fees have been provided that
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// meet a minimum threshold defined by the proposer (for mempool purposes during CheckTx).
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type EthMempoolFeeDecorator struct{}
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// NewEthMempoolFeeDecorator creates a new EthMempoolFeeDecorator
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func NewEthMempoolFeeDecorator() EthMempoolFeeDecorator {
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return EthMempoolFeeDecorator{}
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}
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// AnteHandle verifies that enough fees have been provided by the
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// Ethereum transaction that meet the minimum threshold set by the block
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// proposer.
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//
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// NOTE: This should only be run during a CheckTx mode.
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func (emfd EthMempoolFeeDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simulate bool, next sdk.AnteHandler) (newCtx sdk.Context, err error) {
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if !ctx.IsCheckTx() {
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return next(ctx, tx, simulate)
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}
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msgEthTx, ok := tx.(evmtypes.MsgEthereumTx)
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if !ok {
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return ctx, sdkerrors.Wrapf(sdkerrors.ErrUnknownRequest, "invalid transaction type: %T", tx)
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}
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// fee = GP * GL
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fee := sdk.NewInt64DecCoin(emint.DenomDefault, msgEthTx.Fee().Int64())
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minGasPrices := ctx.MinGasPrices()
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allGTE := true
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for _, v := range minGasPrices {
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if !fee.IsGTE(v) {
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allGTE = false
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}
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}
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// it is assumed that the minimum fees will only include the single valid denom
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if !ctx.MinGasPrices().IsZero() && !allGTE {
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// reject the transaction that does not meet the minimum fee
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return ctx, sdkerrors.Wrap(
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sdkerrors.ErrInsufficientFee,
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fmt.Sprintf("insufficient fee, got: %q required: %q", fee, ctx.MinGasPrices()),
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)
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}
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return next(ctx, tx, simulate)
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}
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// EthSigVerificationDecorator validates an ethereum signature
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type EthSigVerificationDecorator struct{}
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// NewEthSigVerificationDecorator creates a new EthSigVerificationDecorator
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func NewEthSigVerificationDecorator() EthSigVerificationDecorator {
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return EthSigVerificationDecorator{}
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}
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// AnteHandle validates the signature and returns sender address
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func (esvd EthSigVerificationDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simulate bool, next sdk.AnteHandler) (newCtx sdk.Context, err error) {
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msgEthTx, ok := tx.(evmtypes.MsgEthereumTx)
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if !ok {
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return ctx, sdkerrors.Wrapf(sdkerrors.ErrUnknownRequest, "invalid transaction type: %T", tx)
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}
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// parse the chainID from a string to a base-10 integer
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chainID, ok := new(big.Int).SetString(ctx.ChainID(), 10)
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if !ok {
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return ctx, sdkerrors.Wrap(emint.ErrInvalidChainID, ctx.ChainID())
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}
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// validate sender/signature
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// NOTE: signer is retrieved from the transaction on the next AnteDecorator
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_, err = msgEthTx.VerifySig(chainID)
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if err != nil {
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return ctx, sdkerrors.Wrap(sdkerrors.ErrUnauthorized, fmt.Sprintf("signature verification failed"))
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}
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return next(ctx, msgEthTx, simulate)
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}
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// AccountVerificationDecorator validates an account balance checks
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type AccountVerificationDecorator struct {
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ak auth.AccountKeeper
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}
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// NewAccountVerificationDecorator creates a new AccountVerificationDecorator
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func NewAccountVerificationDecorator(ak auth.AccountKeeper) AccountVerificationDecorator {
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return AccountVerificationDecorator{
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ak: ak,
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}
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}
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// AnteHandle validates the signature and returns sender address
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func (avd AccountVerificationDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simulate bool, next sdk.AnteHandler) (newCtx sdk.Context, err error) {
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if !ctx.IsCheckTx() {
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return next(ctx, tx, simulate)
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}
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msgEthTx, ok := tx.(evmtypes.MsgEthereumTx)
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if !ok {
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return ctx, sdkerrors.Wrapf(sdkerrors.ErrUnknownRequest, "invalid transaction type: %T", tx)
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}
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// sender address should be in the tx cache
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address := msgEthTx.From()
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if address == nil {
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panic("sender address is nil")
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}
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acc := avd.ak.GetAccount(ctx, address)
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if acc == nil {
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return ctx, fmt.Errorf("account %s is nil", address)
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}
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// on InitChain make sure account number == 0
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if ctx.BlockHeight() == 0 && acc.GetAccountNumber() != 0 {
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return ctx, sdkerrors.Wrapf(
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sdkerrors.ErrInvalidSequence,
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"invalid account number for height zero (got %d)", acc.GetAccountNumber(),
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)
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}
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// validate sender has enough funds
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balance := acc.GetCoins().AmountOf(emint.DenomDefault)
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if balance.BigInt().Cmp(msgEthTx.Cost()) < 0 {
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return ctx, sdkerrors.Wrapf(
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sdkerrors.ErrInsufficientFunds,
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"%s < %s%s", balance.String(), msgEthTx.Cost().String(), emint.DenomDefault,
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)
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}
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return next(ctx, tx, simulate)
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}
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// NonceVerificationDecorator that the nonce matches
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type NonceVerificationDecorator struct {
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ak auth.AccountKeeper
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}
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// NewNonceVerificationDecorator creates a new NonceVerificationDecorator
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func NewNonceVerificationDecorator(ak auth.AccountKeeper) NonceVerificationDecorator {
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return NonceVerificationDecorator{
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ak: ak,
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}
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}
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// AnteHandle validates that the transaction nonce is valid (equivalent to the sender account’s
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// current nonce).
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func (nvd NonceVerificationDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simulate bool, next sdk.AnteHandler) (newCtx sdk.Context, err error) {
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msgEthTx, ok := tx.(evmtypes.MsgEthereumTx)
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if !ok {
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return ctx, sdkerrors.Wrapf(sdkerrors.ErrUnknownRequest, "invalid transaction type: %T", tx)
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}
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// sender address should be in the tx cache
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address := msgEthTx.From()
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if address == nil {
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panic("sender address is nil")
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}
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acc := nvd.ak.GetAccount(ctx, address)
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if acc == nil {
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return ctx, fmt.Errorf("account %s is nil", address)
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}
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seq := acc.GetSequence()
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if msgEthTx.Data.AccountNonce != seq {
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return ctx, sdkerrors.Wrap(
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sdkerrors.ErrInvalidSequence,
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fmt.Sprintf("invalid nonce; got %d, expected %d", msgEthTx.Data.AccountNonce, seq),
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)
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}
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return next(ctx, tx, simulate)
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}
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// EthGasConsumeDecorator validates enough intrinsic gas for the transaction and
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// gas consumption.
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type EthGasConsumeDecorator struct {
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ak auth.AccountKeeper
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sk types.SupplyKeeper
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}
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// NewEthGasConsumeDecorator creates a new EthGasConsumeDecorator
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func NewEthGasConsumeDecorator(ak auth.AccountKeeper, sk types.SupplyKeeper) EthGasConsumeDecorator {
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return EthGasConsumeDecorator{
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ak: ak,
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sk: sk,
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}
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}
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// AnteHandle validates that the Ethereum tx message has enough to cover intrinsic gas
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// (during CheckTx only) and that the sender has enough balance to pay for the gas cost.
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//
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// Intrinsic gas for a transaction is the amount of gas
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// that the transaction uses before the transaction is executed. The gas is a
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// constant value of 21000 plus any cost inccured by additional bytes of data
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// supplied with the transaction.
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func (egcd EthGasConsumeDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simulate bool, next sdk.AnteHandler) (newCtx sdk.Context, err error) {
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msgEthTx, ok := tx.(evmtypes.MsgEthereumTx)
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if !ok {
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return ctx, sdkerrors.Wrapf(sdkerrors.ErrUnknownRequest, "invalid transaction type: %T", tx)
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}
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// sender address should be in the tx cache
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address := msgEthTx.From()
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if address == nil {
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panic("sender address is nil")
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}
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// Fetch sender account from signature
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senderAcc, err := auth.GetSignerAcc(ctx, egcd.ak, address)
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if err != nil {
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return ctx, err
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}
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if senderAcc == nil {
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return ctx, fmt.Errorf("sender account %s is nil", address)
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}
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gasLimit := msgEthTx.GetGas()
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gas, err := ethcore.IntrinsicGas(msgEthTx.Data.Payload, msgEthTx.To() == nil, true)
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if err != nil {
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return ctx, sdkerrors.Wrap(err, "failed to compute intrinsic gas cost")
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}
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// intrinsic gas verification during CheckTx
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if ctx.IsCheckTx() && gasLimit < gas {
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return ctx, fmt.Errorf("intrinsic gas too low: %d < %d", gasLimit, gas)
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}
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// Charge sender for gas up to limit
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if gasLimit != 0 {
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// Cost calculates the fees paid to validators based on gas limit and price
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cost := new(big.Int).Mul(msgEthTx.Data.Price, new(big.Int).SetUint64(gasLimit))
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feeAmt := sdk.NewCoins(
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sdk.NewCoin(emint.DenomDefault, sdk.NewIntFromBigInt(cost)),
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)
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err = auth.DeductFees(egcd.sk, ctx, senderAcc, feeAmt)
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if err != nil {
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return ctx, err
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}
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}
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// Set gas meter after ante handler to ignore gaskv costs
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newCtx = auth.SetGasMeter(simulate, ctx, gasLimit)
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newCtx.GasMeter().ConsumeGas(gas, "eth intrinsic gas")
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return next(newCtx, tx, simulate)
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}
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// IncrementSenderSequenceDecorator increments the sequence of the signers. The
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// main difference with the SDK's IncrementSequenceDecorator is that the MsgEthereumTx
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// doesn't implement the SigVerifiableTx interface.
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//
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// CONTRACT: must be called after msg.VerifySig in order to cache the sender address.
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type IncrementSenderSequenceDecorator struct {
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ak auth.AccountKeeper
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}
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// NewIncrementSenderSequenceDecorator creates a new IncrementSenderSequenceDecorator.
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func NewIncrementSenderSequenceDecorator(ak auth.AccountKeeper) IncrementSenderSequenceDecorator {
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return IncrementSenderSequenceDecorator{
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ak: ak,
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}
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}
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// AnteHandle handles incrementing the sequence of the sender.
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func (issd IncrementSenderSequenceDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simulate bool, next sdk.AnteHandler) (sdk.Context, error) {
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// no need to increment sequence on RecheckTx
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if ctx.IsReCheckTx() && !simulate {
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return next(ctx, tx, simulate)
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}
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// get and set account must be called with an infinite gas meter in order to prevent
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// additional gas from being deducted.
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oldCtx := ctx.WithBlockGasMeter(sdk.NewInfiniteGasMeter())
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msgEthTx, ok := tx.(evmtypes.MsgEthereumTx)
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if !ok {
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return ctx, sdkerrors.Wrapf(sdkerrors.ErrUnknownRequest, "invalid transaction type: %T", tx)
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}
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// increment sequence of all signers
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for _, addr := range msgEthTx.GetSigners() {
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acc := issd.ak.GetAccount(oldCtx, addr)
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if err := acc.SetSequence(acc.GetSequence() + 1); err != nil {
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panic(err)
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}
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issd.ak.SetAccount(oldCtx, acc)
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}
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return next(ctx, tx, simulate)
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}
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