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bank.go
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bank.go
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package precompiles
import (
"errors"
"math/big"
storetypes "cosmossdk.io/store/types"
sdkmath "cosmossdk.io/math"
"github.com/cosmos/cosmos-sdk/codec"
"github.com/ethereum/go-ethereum/accounts/abi"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core/vm"
errorsmod "cosmossdk.io/errors"
sdk "github.com/cosmos/cosmos-sdk/types"
errortypes "github.com/cosmos/cosmos-sdk/types/errors"
"github.com/crypto-org-chain/cronos/v2/x/cronos/events/bindings/cosmos/precompile/bank"
"github.com/evmos/ethermint/x/evm/types"
)
const (
EVMDenomPrefix = "evm/"
MintMethodName = "mint"
BurnMethodName = "burn"
BalanceOfMethodName = "balanceOf"
TransferMethodName = "transfer"
)
var (
bankABI abi.ABI
bankContractAddress = common.BytesToAddress([]byte{100})
bankGasRequiredByMethod = map[[4]byte]uint64{}
)
func init() {
if err := bankABI.UnmarshalJSON([]byte(bank.BankModuleMetaData.ABI)); err != nil {
panic(err)
}
for methodName := range bankABI.Methods {
var methodID [4]byte
copy(methodID[:], bankABI.Methods[methodName].ID[:4])
switch methodName {
case MintMethodName, BurnMethodName:
bankGasRequiredByMethod[methodID] = 200000
case BalanceOfMethodName:
bankGasRequiredByMethod[methodID] = 10000
case TransferMethodName:
bankGasRequiredByMethod[methodID] = 150000
default:
bankGasRequiredByMethod[methodID] = 0
}
}
}
func EVMDenom(token common.Address) string {
return EVMDenomPrefix + token.Hex()
}
type BankContract struct {
bankKeeper types.BankKeeper
cdc codec.Codec
kvGasConfig storetypes.GasConfig
}
// NewBankContract creates the precompiled contract to manage native tokens
func NewBankContract(bankKeeper types.BankKeeper, cdc codec.Codec, kvGasConfig storetypes.GasConfig) vm.PrecompiledContract {
return &BankContract{bankKeeper, cdc, kvGasConfig}
}
func (bc *BankContract) Address() common.Address {
return bankContractAddress
}
// RequiredGas calculates the contract gas use
func (bc *BankContract) RequiredGas(input []byte) uint64 {
// base cost to prevent large input size
baseCost := uint64(len(input)) * bc.kvGasConfig.WriteCostPerByte
var methodID [4]byte
copy(methodID[:], input[:4])
requiredGas, ok := bankGasRequiredByMethod[methodID]
if ok {
return requiredGas + baseCost
}
return baseCost
}
func (bc *BankContract) checkBlockedAddr(addr sdk.AccAddress) error {
to, err := sdk.AccAddressFromBech32(addr.String())
if err != nil {
return err
}
if bc.bankKeeper.BlockedAddr(to) {
return errorsmod.Wrapf(errortypes.ErrUnauthorized, "%s is not allowed to receive funds", to.String())
}
return nil
}
func (bc *BankContract) Run(evm *vm.EVM, contract *vm.Contract, readonly bool) ([]byte, error) {
// parse input
methodID := contract.Input[:4]
method, err := bankABI.MethodById(methodID)
if err != nil {
return nil, err
}
stateDB := evm.StateDB.(ExtStateDB)
precompileAddr := bc.Address()
switch method.Name {
case MintMethodName, BurnMethodName:
if readonly {
return nil, errors.New("the method is not readonly")
}
args, err := method.Inputs.Unpack(contract.Input[4:])
if err != nil {
return nil, errors.New("fail to unpack input arguments")
}
recipient := args[0].(common.Address)
amount := args[1].(*big.Int)
if amount.Sign() <= 0 {
return nil, errors.New("invalid amount")
}
addr := sdk.AccAddress(recipient.Bytes())
if err := bc.checkBlockedAddr(addr); err != nil {
return nil, err
}
denom := EVMDenom(contract.CallerAddress)
amt := sdk.NewCoin(denom, sdkmath.NewIntFromBigInt(amount))
err = stateDB.ExecuteNativeAction(precompileAddr, nil, func(ctx sdk.Context) error {
if err := bc.bankKeeper.IsSendEnabledCoins(ctx, amt); err != nil {
return err
}
if method.Name == "mint" {
if err := bc.bankKeeper.MintCoins(ctx, types.ModuleName, sdk.NewCoins(amt)); err != nil {
return errorsmod.Wrap(err, "fail to mint coins in precompiled contract")
}
if err := bc.bankKeeper.SendCoinsFromModuleToAccount(ctx, types.ModuleName, addr, sdk.NewCoins(amt)); err != nil {
return errorsmod.Wrap(err, "fail to send mint coins to account")
}
} else {
if err := bc.bankKeeper.SendCoinsFromAccountToModule(ctx, addr, types.ModuleName, sdk.NewCoins(amt)); err != nil {
return errorsmod.Wrap(err, "fail to send burn coins to module")
}
if err := bc.bankKeeper.BurnCoins(ctx, types.ModuleName, sdk.NewCoins(amt)); err != nil {
return errorsmod.Wrap(err, "fail to burn coins in precompiled contract")
}
}
return nil
})
if err != nil {
return nil, err
}
return method.Outputs.Pack(true)
case BalanceOfMethodName:
args, err := method.Inputs.Unpack(contract.Input[4:])
if err != nil {
return nil, errors.New("fail to unpack input arguments")
}
token := args[0].(common.Address)
addr := args[1].(common.Address)
// query from storage
balance := bc.bankKeeper.GetBalance(stateDB.Context(), sdk.AccAddress(addr.Bytes()), EVMDenom(token)).Amount.BigInt()
return method.Outputs.Pack(balance)
case TransferMethodName:
if readonly {
return nil, errors.New("the method is not readonly")
}
args, err := method.Inputs.Unpack(contract.Input[4:])
if err != nil {
return nil, errors.New("fail to unpack input arguments")
}
sender := args[0].(common.Address)
recipient := args[1].(common.Address)
amount := args[2].(*big.Int)
if amount.Sign() <= 0 {
return nil, errors.New("invalid amount")
}
from := sdk.AccAddress(sender.Bytes())
to := sdk.AccAddress(recipient.Bytes())
if err := bc.checkBlockedAddr(to); err != nil {
return nil, err
}
denom := EVMDenom(contract.CallerAddress)
amt := sdk.NewCoin(denom, sdkmath.NewIntFromBigInt(amount))
err = stateDB.ExecuteNativeAction(precompileAddr, nil, func(ctx sdk.Context) error {
if err := bc.bankKeeper.IsSendEnabledCoins(ctx, amt); err != nil {
return err
}
if err := bc.bankKeeper.SendCoins(ctx, from, to, sdk.NewCoins(amt)); err != nil {
return errorsmod.Wrap(err, "fail to send coins in precompiled contract")
}
return nil
})
if err != nil {
return nil, err
}
return method.Outputs.Pack(true)
default:
return nil, errors.New("unknown method")
}
}