1fe07edbf9
* Problem: state transition code is duplicated Closes: #672 Solution: - move gas refund out from ApplyMessage - move check into ApplyMessage - move evm construction into ApplyMessage - ensure context stack is clean after ApplyMessage return fix unit tests undo rename add underflow check * improve performance - don't duplicate params loading - passing EVMConfig around as pointer
578 lines
20 KiB
Go
578 lines
20 KiB
Go
package ante
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import (
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"errors"
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"math/big"
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"github.com/palantir/stacktrace"
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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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authante "github.com/cosmos/cosmos-sdk/x/auth/ante"
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ethermint "github.com/tharsis/ethermint/types"
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evmkeeper "github.com/tharsis/ethermint/x/evm/keeper"
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evmtypes "github.com/tharsis/ethermint/x/evm/types"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/core"
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ethtypes "github.com/ethereum/go-ethereum/core/types"
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"github.com/ethereum/go-ethereum/core/vm"
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)
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// EVMKeeper defines the expected keeper interface used on the Eth AnteHandler
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type EVMKeeper interface {
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vm.StateDB
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ChainID() *big.Int
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GetParams(ctx sdk.Context) evmtypes.Params
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WithContext(ctx sdk.Context)
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ResetRefundTransient(ctx sdk.Context)
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NewEVM(msg core.Message, cfg *evmtypes.EVMConfig, tracer vm.Tracer) *vm.EVM
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GetCodeHash(addr common.Address) common.Hash
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DeductTxCostsFromUserBalance(
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ctx sdk.Context, msgEthTx evmtypes.MsgEthereumTx, txData evmtypes.TxData, denom string, homestead, istanbul, london bool,
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) (sdk.Coins, error)
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}
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// EthSigVerificationDecorator validates an ethereum signatures
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type EthSigVerificationDecorator struct {
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evmKeeper EVMKeeper
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}
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// NewEthSigVerificationDecorator creates a new EthSigVerificationDecorator
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func NewEthSigVerificationDecorator(ek EVMKeeper) EthSigVerificationDecorator {
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return EthSigVerificationDecorator{
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evmKeeper: ek,
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}
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}
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// AnteHandle validates checks that the registered chain id is the same as the one on the message, and
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// that the signer address matches the one defined on the message.
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// It's not skipped for RecheckTx, because it set `From` address which is critical from other ante handler to work.
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// Failure in RecheckTx will prevent tx to be included into block, especially when CheckTx succeed, in which case user
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// won't see the error message.
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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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if tx == nil || len(tx.GetMsgs()) != 1 {
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return ctx, stacktrace.Propagate(
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sdkerrors.Wrap(sdkerrors.ErrInvalidRequest, "only 1 ethereum msg supported per tx"),
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"",
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)
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}
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chainID := esvd.evmKeeper.ChainID()
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params := esvd.evmKeeper.GetParams(ctx)
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ethCfg := params.ChainConfig.EthereumConfig(chainID)
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blockNum := big.NewInt(ctx.BlockHeight())
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signer := ethtypes.MakeSigner(ethCfg, blockNum)
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msg := tx.GetMsgs()[0]
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msgEthTx, ok := msg.(*evmtypes.MsgEthereumTx)
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if !ok {
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return ctx, stacktrace.Propagate(
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sdkerrors.Wrapf(sdkerrors.ErrUnknownRequest, "invalid transaction type %T, expected %T", tx, (*evmtypes.MsgEthereumTx)(nil)),
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"failed to cast transaction",
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)
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}
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sender, err := signer.Sender(msgEthTx.AsTransaction())
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if err != nil {
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return ctx, stacktrace.Propagate(
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sdkerrors.Wrap(sdkerrors.ErrorInvalidSigner, err.Error()),
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"couldn't retrieve sender address ('%s') from the ethereum transaction",
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msgEthTx.From,
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)
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}
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// set up the sender to the transaction field if not already
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msgEthTx.From = sender.Hex()
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return next(ctx, msgEthTx, simulate)
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}
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// EthAccountVerificationDecorator validates an account balance checks
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type EthAccountVerificationDecorator struct {
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ak evmtypes.AccountKeeper
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bankKeeper evmtypes.BankKeeper
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evmKeeper EVMKeeper
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}
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// NewEthAccountVerificationDecorator creates a new EthAccountVerificationDecorator
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func NewEthAccountVerificationDecorator(ak evmtypes.AccountKeeper, bankKeeper evmtypes.BankKeeper, ek EVMKeeper) EthAccountVerificationDecorator {
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return EthAccountVerificationDecorator{
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ak: ak,
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bankKeeper: bankKeeper,
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evmKeeper: ek,
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}
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}
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// AnteHandle validates checks that the sender balance is greater than the total transaction cost.
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// The account will be set to store if it doesn't exis, i.e cannot be found on store.
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// This AnteHandler decorator will fail if:
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// - any of the msgs is not a MsgEthereumTx
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// - from address is empty
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// - account balance is lower than the transaction cost
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func (avd EthAccountVerificationDecorator) 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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avd.evmKeeper.WithContext(ctx)
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evmDenom := avd.evmKeeper.GetParams(ctx).EvmDenom
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for i, msg := range tx.GetMsgs() {
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msgEthTx, ok := msg.(*evmtypes.MsgEthereumTx)
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if !ok {
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return ctx, stacktrace.Propagate(
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sdkerrors.Wrapf(sdkerrors.ErrUnknownRequest, "invalid transaction type %T, expected %T", tx, (*evmtypes.MsgEthereumTx)(nil)),
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"failed to cast transaction %d", i,
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)
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}
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txData, err := evmtypes.UnpackTxData(msgEthTx.Data)
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if err != nil {
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return ctx, stacktrace.Propagate(err, "failed to unpack tx data any for tx %d", i)
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}
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// sender address should be in the tx cache from the previous AnteHandle call
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from := msgEthTx.GetFrom()
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if from.Empty() {
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return ctx, stacktrace.Propagate(
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sdkerrors.Wrapf(sdkerrors.ErrInvalidAddress, "from address cannot be empty"),
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"sender address should have been in the tx field from the previous AnteHandle call",
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)
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}
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// check whether the sender address is EOA
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fromAddr := common.BytesToAddress(from)
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codeHash := avd.evmKeeper.GetCodeHash(fromAddr)
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if codeHash != common.BytesToHash(evmtypes.EmptyCodeHash) {
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return ctx, stacktrace.Propagate(sdkerrors.Wrapf(sdkerrors.ErrInvalidType,
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"the sender is not EOA: address <%v>, codeHash <%s>", fromAddr, codeHash), "")
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}
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acc := avd.ak.GetAccount(ctx, from)
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if acc == nil {
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acc = avd.ak.NewAccountWithAddress(ctx, from)
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avd.ak.SetAccount(ctx, acc)
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}
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if err := evmkeeper.CheckSenderBalance(ctx, avd.bankKeeper, from, txData, evmDenom); err != nil {
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return ctx, stacktrace.Propagate(err, "failed to check sender balance")
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}
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}
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// recover the original gas meter
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avd.evmKeeper.WithContext(ctx)
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return next(ctx, tx, simulate)
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}
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// EthNonceVerificationDecorator checks that the account nonce from the transaction matches
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// the sender account sequence.
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type EthNonceVerificationDecorator struct {
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ak evmtypes.AccountKeeper
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}
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// NewEthNonceVerificationDecorator creates a new EthNonceVerificationDecorator
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func NewEthNonceVerificationDecorator(ak evmtypes.AccountKeeper) EthNonceVerificationDecorator {
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return EthNonceVerificationDecorator{
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ak: ak,
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}
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}
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// AnteHandle validates that the transaction nonces are valid and equivalent to the sender account’s
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// current nonce.
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func (nvd EthNonceVerificationDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simulate bool, next sdk.AnteHandler) (newCtx sdk.Context, err error) {
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// no need to check the nonce on ReCheckTx
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if ctx.IsReCheckTx() {
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return next(ctx, tx, simulate)
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}
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for i, msg := range tx.GetMsgs() {
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msgEthTx, ok := msg.(*evmtypes.MsgEthereumTx)
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if !ok {
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return ctx, stacktrace.Propagate(
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sdkerrors.Wrapf(sdkerrors.ErrUnknownRequest, "invalid transaction type %T, expected %T", tx, (*evmtypes.MsgEthereumTx)(nil)),
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"failed to cast transaction %d", i,
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)
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}
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// sender address should be in the tx cache from the previous AnteHandle call
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seq, err := nvd.ak.GetSequence(ctx, msgEthTx.GetFrom())
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if err != nil {
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return ctx, stacktrace.Propagate(err, "sequence not found for address %s", msgEthTx.From)
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}
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txData, err := evmtypes.UnpackTxData(msgEthTx.Data)
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if err != nil {
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return ctx, stacktrace.Propagate(err, "failed to unpack tx data")
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}
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// if multiple transactions are submitted in succession with increasing nonces,
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// all will be rejected except the first, since the first needs to be included in a block
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// before the sequence increments
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if txData.GetNonce() != seq {
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return ctx, stacktrace.Propagate(
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sdkerrors.Wrapf(
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sdkerrors.ErrInvalidSequence,
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"invalid nonce; got %d, expected %d", txData.GetNonce(), seq,
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),
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"",
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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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// 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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evmKeeper EVMKeeper
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}
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// NewEthGasConsumeDecorator creates a new EthGasConsumeDecorator
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func NewEthGasConsumeDecorator(
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evmKeeper EVMKeeper,
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) EthGasConsumeDecorator {
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return EthGasConsumeDecorator{
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evmKeeper: evmKeeper,
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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 that the transaction uses before the
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// transaction is executed. The gas is a constant value plus any cost inccured by additional bytes
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// of data supplied with the transaction.
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//
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// This AnteHandler decorator will fail if:
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// - the transaction contains more than one message
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// - the message is not a MsgEthereumTx
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// - sender account cannot be found
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// - transaction's gas limit is lower than the intrinsic gas
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// - user doesn't have enough balance to deduct the transaction fees (gas_limit * gas_price)
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// - transaction or block gas meter runs out of gas
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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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// reset the refund gas value in the keeper for the current transaction
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egcd.evmKeeper.ResetRefundTransient(ctx)
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params := egcd.evmKeeper.GetParams(ctx)
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ethCfg := params.ChainConfig.EthereumConfig(egcd.evmKeeper.ChainID())
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blockHeight := big.NewInt(ctx.BlockHeight())
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homestead := ethCfg.IsHomestead(blockHeight)
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istanbul := ethCfg.IsIstanbul(blockHeight)
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london := ethCfg.IsLondon(blockHeight)
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evmDenom := params.EvmDenom
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var events sdk.Events
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for i, msg := range tx.GetMsgs() {
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msgEthTx, ok := msg.(*evmtypes.MsgEthereumTx)
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if !ok {
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return ctx, stacktrace.Propagate(
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sdkerrors.Wrapf(sdkerrors.ErrUnknownRequest, "invalid transaction type %T, expected %T", tx, (*evmtypes.MsgEthereumTx)(nil)),
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"failed to cast transaction %d", i,
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)
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}
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txData, err := evmtypes.UnpackTxData(msgEthTx.Data)
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if err != nil {
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return ctx, stacktrace.Propagate(err, "failed to unpack tx data")
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}
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fees, err := egcd.evmKeeper.DeductTxCostsFromUserBalance(
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ctx,
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*msgEthTx,
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txData,
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evmDenom,
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homestead,
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istanbul,
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london,
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)
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if err != nil {
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return ctx, stacktrace.Propagate(err, "failed to deduct transaction costs from user balance")
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}
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events = append(events, sdk.NewEvent(sdk.EventTypeTx, sdk.NewAttribute(sdk.AttributeKeyFee, fees.String())))
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}
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// TODO: change to typed events
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ctx.EventManager().EmitEvents(events)
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// TODO: deprecate after https://github.com/cosmos/cosmos-sdk/issues/9514 is fixed on SDK
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blockGasLimit := ethermint.BlockGasLimit(ctx)
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// NOTE: safety check
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if blockGasLimit > 0 {
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// generate a copy of the gas pool (i.e block gas meter) to see if we've run out of gas for this block
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// if current gas consumed is greater than the limit, this funcion panics and the error is recovered on the Baseapp
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gasPool := sdk.NewGasMeter(blockGasLimit)
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gasPool.ConsumeGas(ctx.GasMeter().GasConsumedToLimit(), "gas pool check")
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}
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// we know that we have enough gas on the pool to cover the intrinsic gas
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// set up the updated context to the evm Keeper
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egcd.evmKeeper.WithContext(ctx)
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return next(ctx, tx, simulate)
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}
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// CanTransferDecorator checks if the sender is allowed to transfer funds according to the EVM block
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// context rules.
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type CanTransferDecorator struct {
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evmKeeper EVMKeeper
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feemarketKeeper evmtypes.FeeMarketKeeper
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}
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// NewCanTransferDecorator creates a new CanTransferDecorator instance.
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func NewCanTransferDecorator(evmKeeper EVMKeeper, fmk evmtypes.FeeMarketKeeper) CanTransferDecorator {
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return CanTransferDecorator{
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evmKeeper: evmKeeper,
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feemarketKeeper: fmk,
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}
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}
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// AnteHandle creates an EVM from the message and calls the BlockContext CanTransfer function to
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// see if the address can execute the transaction.
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func (ctd CanTransferDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simulate bool, next sdk.AnteHandler) (sdk.Context, error) {
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ctd.evmKeeper.WithContext(ctx)
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params := ctd.evmKeeper.GetParams(ctx)
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feeMktParams := ctd.feemarketKeeper.GetParams(ctx)
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ethCfg := params.ChainConfig.EthereumConfig(ctd.evmKeeper.ChainID())
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signer := ethtypes.MakeSigner(ethCfg, big.NewInt(ctx.BlockHeight()))
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for i, msg := range tx.GetMsgs() {
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msgEthTx, ok := msg.(*evmtypes.MsgEthereumTx)
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if !ok {
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return ctx, stacktrace.Propagate(
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sdkerrors.Wrapf(sdkerrors.ErrUnknownRequest, "invalid transaction type %T, expected %T", tx, (*evmtypes.MsgEthereumTx)(nil)),
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"failed to cast transaction %d", i,
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)
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}
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var baseFee *big.Int
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if evmtypes.IsLondon(ethCfg, ctx.BlockHeight()) && !feeMktParams.NoBaseFee {
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baseFee = ctd.feemarketKeeper.GetBaseFee(ctx)
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}
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coreMsg, err := msgEthTx.AsMessage(signer, baseFee)
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if err != nil {
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return ctx, stacktrace.Propagate(
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err,
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"failed to create an ethereum core.Message from signer %T", signer,
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)
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}
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// NOTE: pass in an empty coinbase address and nil tracer as we don't need them for the check below
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cfg := &evmtypes.EVMConfig{
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ChainConfig: ethCfg,
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Params: params,
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CoinBase: common.Address{},
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BaseFee: baseFee,
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}
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evm := ctd.evmKeeper.NewEVM(coreMsg, cfg, evmtypes.NewNoOpTracer())
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// check that caller has enough balance to cover asset transfer for **topmost** call
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// NOTE: here the gas consumed is from the context with the infinite gas meter
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if coreMsg.Value().Sign() > 0 && !evm.Context.CanTransfer(ctd.evmKeeper, coreMsg.From(), coreMsg.Value()) {
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return ctx, stacktrace.Propagate(
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sdkerrors.Wrapf(sdkerrors.ErrInsufficientFunds, "address %s", coreMsg.From()),
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"failed to transfer %s using the EVM block context transfer function", coreMsg.Value(),
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)
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}
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if evmtypes.IsLondon(ethCfg, ctx.BlockHeight()) && !feeMktParams.NoBaseFee && baseFee == nil {
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return ctx, stacktrace.Propagate(
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sdkerrors.Wrap(evmtypes.ErrInvalidBaseFee, "base fee is supported but evm block context value is nil"),
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"address %s", coreMsg.From(),
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)
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}
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if evmtypes.IsLondon(ethCfg, ctx.BlockHeight()) && !feeMktParams.NoBaseFee && baseFee != nil && coreMsg.GasFeeCap().Cmp(baseFee) < 0 {
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return ctx, stacktrace.Propagate(
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sdkerrors.Wrapf(evmtypes.ErrInvalidBaseFee, "max fee per gas less than block base fee (%s < %s)", coreMsg.GasFeeCap(), baseFee),
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"address %s", coreMsg.From(),
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)
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}
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}
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ctd.evmKeeper.WithContext(ctx)
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// set the original gas meter
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return next(ctx, tx, simulate)
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}
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// AccessListDecorator prepare an access list for the sender if Yolov3/Berlin/EIPs 2929 and 2930 are
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// applicable at the current block number.
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type AccessListDecorator struct {
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evmKeeper EVMKeeper
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}
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// NewAccessListDecorator creates a new AccessListDecorator.
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func NewAccessListDecorator(evmKeeper EVMKeeper) AccessListDecorator {
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return AccessListDecorator{
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evmKeeper: evmKeeper,
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}
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}
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// AnteHandle handles the preparatory steps for executing an EVM state transition with
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// regards to both EIP-2929 and EIP-2930:
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//
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// - Add sender to access list (2929)
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// - Add destination to access list (2929)
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// - Add precompiles to access list (2929)
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// - Add the contents of the optional tx access list (2930)
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//
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// The AnteHandler will only prepare the access list if Yolov3/Berlin/EIPs 2929 and 2930 are applicable at the current number.
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func (ald AccessListDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simulate bool, next sdk.AnteHandler) (sdk.Context, error) {
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params := ald.evmKeeper.GetParams(ctx)
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ethCfg := params.ChainConfig.EthereumConfig(ald.evmKeeper.ChainID())
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rules := ethCfg.Rules(big.NewInt(ctx.BlockHeight()))
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// we don't need to prepare the access list if the chain is not currently on the Berlin upgrade
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if !rules.IsBerlin {
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return next(ctx, tx, simulate)
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}
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// setup the keeper context before setting the access list
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ald.evmKeeper.WithContext(ctx)
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for i, msg := range tx.GetMsgs() {
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msgEthTx, ok := msg.(*evmtypes.MsgEthereumTx)
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if !ok {
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||
return ctx, stacktrace.Propagate(
|
||
sdkerrors.Wrapf(sdkerrors.ErrUnknownRequest, "invalid transaction type %T, expected %T", tx, (*evmtypes.MsgEthereumTx)(nil)),
|
||
"failed to cast transaction %d", i,
|
||
)
|
||
}
|
||
|
||
sender := common.BytesToAddress(msgEthTx.GetFrom())
|
||
|
||
txData, err := evmtypes.UnpackTxData(msgEthTx.Data)
|
||
if err != nil {
|
||
return ctx, stacktrace.Propagate(err, "failed to unpack tx data")
|
||
}
|
||
|
||
ald.evmKeeper.PrepareAccessList(sender, txData.GetTo(), vm.ActivePrecompiles(rules), txData.GetAccessList())
|
||
}
|
||
|
||
// set the original gas meter
|
||
ald.evmKeeper.WithContext(ctx)
|
||
return next(ctx, tx, simulate)
|
||
}
|
||
|
||
// EthIncrementSenderSequenceDecorator increments the sequence of the signers.
|
||
type EthIncrementSenderSequenceDecorator struct {
|
||
ak evmtypes.AccountKeeper
|
||
}
|
||
|
||
// NewEthIncrementSenderSequenceDecorator creates a new EthIncrementSenderSequenceDecorator.
|
||
func NewEthIncrementSenderSequenceDecorator(ak evmtypes.AccountKeeper) EthIncrementSenderSequenceDecorator {
|
||
return EthIncrementSenderSequenceDecorator{
|
||
ak: ak,
|
||
}
|
||
}
|
||
|
||
// AnteHandle handles incrementing the sequence of the signer (i.e sender). If the transaction is a
|
||
// contract creation, the nonce will be incremented during the transaction execution and not within
|
||
// this AnteHandler decorator.
|
||
func (issd EthIncrementSenderSequenceDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simulate bool, next sdk.AnteHandler) (sdk.Context, error) {
|
||
for i, msg := range tx.GetMsgs() {
|
||
msgEthTx, ok := msg.(*evmtypes.MsgEthereumTx)
|
||
if !ok {
|
||
return ctx, stacktrace.Propagate(
|
||
sdkerrors.Wrapf(sdkerrors.ErrUnknownRequest, "invalid transaction type %T, expected %T", tx, (*evmtypes.MsgEthereumTx)(nil)),
|
||
"failed to cast transaction %d", i,
|
||
)
|
||
}
|
||
|
||
txData, err := evmtypes.UnpackTxData(msgEthTx.Data)
|
||
if err != nil {
|
||
return ctx, stacktrace.Propagate(err, "failed to unpack tx data")
|
||
}
|
||
|
||
// NOTE: on contract creation, the nonce is incremented within the EVM Create function during tx execution
|
||
// and not previous to the state transition ¯\_(ツ)_/¯
|
||
if txData.GetTo() == nil {
|
||
// contract creation, don't increment sequence on AnteHandler but on tx execution
|
||
// continue to the next item
|
||
continue
|
||
}
|
||
|
||
// increment sequence of all signers
|
||
for _, addr := range msg.GetSigners() {
|
||
acc := issd.ak.GetAccount(ctx, addr)
|
||
|
||
if acc == nil {
|
||
return ctx, stacktrace.Propagate(
|
||
sdkerrors.Wrapf(
|
||
sdkerrors.ErrUnknownAddress,
|
||
"account %s (%s) is nil", common.BytesToAddress(addr.Bytes()), addr,
|
||
),
|
||
"signer account not found",
|
||
)
|
||
}
|
||
|
||
if err := acc.SetSequence(acc.GetSequence() + 1); err != nil {
|
||
return ctx, stacktrace.Propagate(err, "failed to set sequence to %d", acc.GetSequence()+1)
|
||
}
|
||
|
||
issd.ak.SetAccount(ctx, acc)
|
||
}
|
||
}
|
||
|
||
// set the original gas meter
|
||
return next(ctx, tx, simulate)
|
||
}
|
||
|
||
// EthValidateBasicDecorator is adapted from ValidateBasicDecorator from cosmos-sdk, it ignores ErrNoSignatures
|
||
type EthValidateBasicDecorator struct{}
|
||
|
||
// NewEthValidateBasicDecorator creates a new EthValidateBasicDecorator
|
||
func NewEthValidateBasicDecorator() EthValidateBasicDecorator {
|
||
return EthValidateBasicDecorator{}
|
||
}
|
||
|
||
// AnteHandle handles basic validation of tx
|
||
func (vbd EthValidateBasicDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simulate bool, next sdk.AnteHandler) (sdk.Context, error) {
|
||
// no need to validate basic on recheck tx, call next antehandler
|
||
if ctx.IsReCheckTx() {
|
||
return next(ctx, tx, simulate)
|
||
}
|
||
|
||
err := tx.ValidateBasic()
|
||
// ErrNoSignatures is fine with eth tx
|
||
if err != nil && !errors.Is(err, sdkerrors.ErrNoSignatures) {
|
||
return ctx, stacktrace.Propagate(err, "tx basic validation failed")
|
||
}
|
||
|
||
return next(ctx, tx, simulate)
|
||
}
|
||
|
||
// EthSetupContextDecorator is adapted from SetUpContextDecorator from cosmos-sdk, it ignores gas consumption
|
||
// by setting the gas meter to infinite
|
||
type EthSetupContextDecorator struct{}
|
||
|
||
func NewEthSetUpContextDecorator() EthSetupContextDecorator {
|
||
return EthSetupContextDecorator{}
|
||
}
|
||
|
||
func (esc EthSetupContextDecorator) AnteHandle(ctx sdk.Context, tx sdk.Tx, simulate bool, next sdk.AnteHandler) (newCtx sdk.Context, err error) {
|
||
// all transactions must implement GasTx
|
||
_, ok := tx.(authante.GasTx)
|
||
if !ok {
|
||
return newCtx, sdkerrors.Wrap(sdkerrors.ErrTxDecode, "Tx must be GasTx")
|
||
}
|
||
|
||
newCtx = ctx.WithGasMeter(sdk.NewInfiniteGasMeter())
|
||
return next(newCtx, tx, simulate)
|
||
}
|