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evm.go
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evm.go
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package keeper
import (
"errors"
"fmt"
"math"
"math/big"
sdk "github.com/cosmos/cosmos-sdk/types"
sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core"
ethtypes "github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/core/vm"
"github.com/ethereum/go-ethereum/params"
"github.com/sei-protocol/sei-chain/utils"
"github.com/sei-protocol/sei-chain/x/evm/state"
"github.com/sei-protocol/sei-chain/x/evm/types"
)
type EVMCallFunc func(caller vm.ContractRef, addr *common.Address, input []byte, gas uint64, value *big.Int) (ret []byte, leftOverGas uint64, err error)
var MaxUint64BigInt = new(big.Int).SetUint64(math.MaxUint64)
func (k *Keeper) HandleInternalEVMCall(ctx sdk.Context, req *types.MsgInternalEVMCall) (*sdk.Result, error) {
var to *common.Address
if req.To != "" {
addr := common.HexToAddress(req.To)
to = &addr
}
senderAddr, err := sdk.AccAddressFromBech32(req.Sender)
if err != nil {
return nil, err
}
ret, err := k.CallEVM(ctx, k.GetEVMAddressOrDefault(ctx, senderAddr), to, req.Value, req.Data)
if err != nil {
return nil, err
}
return &sdk.Result{Data: ret}, nil
}
func (k *Keeper) HandleInternalEVMDelegateCall(ctx sdk.Context, req *types.MsgInternalEVMDelegateCall) (*sdk.Result, error) {
var to *common.Address
if req.To != "" {
addr := common.HexToAddress(req.To)
to = &addr
} else {
return nil, errors.New("cannot use a CosmWasm contract to delegate-create an EVM contract")
}
addr, _, exists := k.GetPointerInfo(ctx, types.PointerReverseRegistryKey(common.BytesToAddress([]byte(req.FromContract))))
if !exists || common.BytesToAddress(addr).Cmp(*to) != 0 {
return nil, errors.New("only pointer contract can make delegatecalls")
}
zeroInt := sdk.ZeroInt()
senderAddr, err := sdk.AccAddressFromBech32(req.Sender)
if err != nil {
return nil, err
}
// delegatecall caller must be associated; otherwise any state change on EVM contract will be lost
// after they asssociate.
senderEvmAddr, found := k.GetEVMAddress(ctx, senderAddr)
if !found {
return nil, fmt.Errorf("sender %s is not associated", req.Sender)
}
ret, err := k.CallEVM(ctx, senderEvmAddr, to, &zeroInt, req.Data)
if err != nil {
return nil, err
}
return &sdk.Result{Data: ret}, nil
}
func (k *Keeper) CallEVM(ctx sdk.Context, from common.Address, to *common.Address, val *sdk.Int, data []byte) (retdata []byte, reterr error) {
if ctx.IsEVM() {
return nil, errors.New("sei does not support EVM->CW->EVM call pattern")
}
if to == nil && len(data) > params.MaxInitCodeSize {
return nil, fmt.Errorf("%w: code size %v, limit %v", core.ErrMaxInitCodeSizeExceeded, len(data), params.MaxInitCodeSize)
}
value := utils.Big0
if val != nil {
if val.IsNegative() {
return nil, sdkerrors.ErrInvalidCoins
}
value = val.BigInt()
}
// This call was not part of an existing StateTransition, so it should trigger one
executionCtx := ctx.WithGasMeter(sdk.NewInfiniteGasMeterWithMultiplier(ctx))
stateDB := state.NewDBImpl(executionCtx, k, false)
gp := k.GetGasPool()
evmMsg := &core.Message{
Nonce: stateDB.GetNonce(from), // replay attack is prevented by the AccountSequence number set on the CW transaction that triggered this call
GasLimit: k.getEvmGasLimitFromCtx(ctx),
GasPrice: utils.Big0, // fees are already paid on the CW transaction
GasFeeCap: utils.Big0,
GasTipCap: utils.Big0,
To: to,
Value: value,
Data: data,
SkipAccountChecks: false,
From: from,
}
res, err := k.applyEVMMessage(ctx, evmMsg, stateDB, gp)
if err != nil {
return nil, err
}
k.consumeEvmGas(ctx, res.UsedGas)
if res.Err != nil {
return nil, res.Err
}
surplus, err := stateDB.Finalize()
if err != nil {
return nil, err
}
k.AppendToEvmTxDeferredInfo(ctx, ethtypes.Bloom{}, ethtypes.EmptyTxsHash, surplus)
return res.ReturnData, nil
}
func (k *Keeper) StaticCallEVM(ctx sdk.Context, from sdk.AccAddress, to *common.Address, data []byte) ([]byte, error) {
evm, err := k.createReadOnlyEVM(ctx, from)
if err != nil {
return nil, err
}
return k.callEVM(ctx, k.GetEVMAddressOrDefault(ctx, from), to, nil, data, func(caller vm.ContractRef, addr *common.Address, input []byte, gas uint64, _ *big.Int) ([]byte, uint64, error) {
return evm.StaticCall(caller, *addr, input, gas)
})
}
func (k *Keeper) callEVM(ctx sdk.Context, from common.Address, to *common.Address, val *sdk.Int, data []byte, f EVMCallFunc) ([]byte, error) {
evmGasLimit := k.getEvmGasLimitFromCtx(ctx)
value := utils.Big0
if val != nil {
value = val.BigInt()
}
ret, leftoverGas, err := f(vm.AccountRef(from), to, data, evmGasLimit, value)
k.consumeEvmGas(ctx, evmGasLimit-leftoverGas)
if err != nil {
return nil, err
}
return ret, nil
}
// only used for StaticCalls
func (k *Keeper) createReadOnlyEVM(ctx sdk.Context, from sdk.AccAddress) (*vm.EVM, error) {
executionCtx := ctx.WithGasMeter(sdk.NewInfiniteGasMeterWithMultiplier(ctx))
stateDB := state.NewDBImpl(executionCtx, k, true)
gp := k.GetGasPool()
blockCtx, err := k.GetVMBlockContext(executionCtx, gp)
if err != nil {
return nil, err
}
cfg := types.DefaultChainConfig().EthereumConfig(k.ChainID(ctx))
txCtx := vm.TxContext{Origin: k.GetEVMAddressOrDefault(ctx, from)}
return vm.NewEVM(*blockCtx, txCtx, stateDB, cfg, vm.Config{}), nil
}
func (k *Keeper) getEvmGasLimitFromCtx(ctx sdk.Context) uint64 {
seiGasRemaining := ctx.GasMeter().Limit() - ctx.GasMeter().GasConsumedToLimit()
if ctx.GasMeter().Limit() <= 0 {
return math.MaxUint64
}
evmGasBig := sdk.NewDecFromInt(sdk.NewIntFromUint64(seiGasRemaining)).Quo(k.GetPriorityNormalizer(ctx)).TruncateInt().BigInt()
if evmGasBig.Cmp(MaxUint64BigInt) > 0 {
evmGasBig = MaxUint64BigInt
}
return evmGasBig.Uint64()
}
func (k *Keeper) consumeEvmGas(ctx sdk.Context, usedEvmGas uint64) {
ctx.GasMeter().ConsumeGas(sdk.NewDecFromInt(sdk.NewIntFromUint64(usedEvmGas)).Mul(k.GetPriorityNormalizer(ctx)).TruncateInt().Uint64(), "call EVM")
}