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crosschain.go
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crosschain.go
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package crosschain
import (
"errors"
"fmt"
"math/big"
"strings"
sdkmath "cosmossdk.io/math"
"github.com/armon/go-metrics"
"github.com/cosmos/cosmos-sdk/telemetry"
sdk "github.com/cosmos/cosmos-sdk/types"
transfertypes "github.com/cosmos/ibc-go/v6/modules/apps/transfer/types"
ibcclienttypes "github.com/cosmos/ibc-go/v6/modules/core/02-client/types"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core/vm"
evmtypes "github.com/evmos/ethermint/x/evm/types"
fxtypes "github.com/functionx/fx-core/v4/types"
erc20types "github.com/functionx/fx-core/v4/x/erc20/types"
"github.com/functionx/fx-core/v4/x/evm/types"
)
// FIP20CrossChain only for fip20 contract transferCrossChain called
//
//gocyclo:ignore
func (c *Contract) FIP20CrossChain(ctx sdk.Context, evm *vm.EVM, contract *vm.Contract, readonly bool) ([]byte, error) {
if readonly {
return nil, errors.New("fip20 cross chain method not readonly")
}
tokenContract := contract.Caller()
tokenPair, found := c.erc20Keeper.GetTokenPairByAddress(ctx, tokenContract)
if !found {
return nil, fmt.Errorf("token pair not found: %s", tokenContract.String())
}
var args FIP20CrossChainArgs
if err := types.ParseMethodArgs(FIP20CrossChainMethod, &args, contract.Input[4:]); err != nil {
return nil, err
}
amountCoin := sdk.NewCoin(tokenPair.GetDenom(), sdkmath.NewIntFromBigInt(args.Amount))
feeCoin := sdk.NewCoin(tokenPair.GetDenom(), sdkmath.NewIntFromBigInt(args.Fee))
totalCoin := sdk.NewCoin(tokenPair.GetDenom(), amountCoin.Amount.Add(feeCoin.Amount))
// NOTE: if user call evm denom transferCrossChain with msg.value
// we need transfer msg.value from sender to contract in bank keeper
evmDenom := c.evmKeeper.GetParams(ctx).EvmDenom
if tokenPair.GetDenom() == evmDenom {
balance := c.bankKeeper.GetBalance(ctx, tokenContract.Bytes(), evmDenom)
evmBalance := evm.StateDB.GetBalance(tokenContract)
cmp := evmBalance.Cmp(balance.Amount.BigInt())
if cmp == -1 {
return nil, fmt.Errorf("invalid balance(chain: %s,evm: %s)", balance.Amount.String(), evmBalance.String())
}
if cmp == 1 {
// sender call transferCrossChain with msg.value, the msg.value evm denom should send to contract
value := big.NewInt(0).Sub(evmBalance, balance.Amount.BigInt())
valueCoin := sdk.NewCoins(sdk.NewCoin(evmDenom, sdkmath.NewIntFromBigInt(value)))
if err := c.bankKeeper.SendCoins(ctx, args.Sender.Bytes(), tokenContract.Bytes(), valueCoin); err != nil {
return nil, fmt.Errorf("send coin: %s", err.Error())
}
}
}
// transfer token from evm to local chain
if err := c.convertERC20(ctx, evm, tokenPair, totalCoin, args.Sender); err != nil {
return nil, err
}
fxTarget := fxtypes.ParseFxTarget(fxtypes.Byte32ToString(args.Target))
if err := c.handlerCrossChain(ctx, args.Sender.Bytes(), args.Receipt, amountCoin, feeCoin, fxTarget, args.Memo, false); err != nil {
return nil, err
}
// add event log
if err := c.AddLog(evm, CrossChainEvent, []common.Hash{args.Sender.Hash(), tokenPair.GetERC20Contract().Hash()},
tokenPair.GetDenom(), args.Receipt, args.Amount, args.Fee, args.Target, args.Memo); err != nil {
return nil, err
}
// add fip20CrossChain events
fip20CrossChainEvents(ctx, args.Sender, tokenPair.GetERC20Contract(), args.Receipt,
fxtypes.Byte32ToString(args.Target), tokenPair.GetDenom(), args.Amount, args.Fee)
return FIP20CrossChainMethod.Outputs.Pack(true)
}
// CrossChain called at any address(account or contract)
//
//gocyclo:ignore
func (c *Contract) CrossChain(ctx sdk.Context, evm *vm.EVM, contract *vm.Contract, readonly bool) ([]byte, error) {
if readonly {
return nil, errors.New("cross chain method not readonly")
}
// args
var args CrossChainArgs
err := types.ParseMethodArgs(CrossChainMethod, &args, contract.Input[4:])
if err != nil {
return nil, err
}
// call param
value := contract.Value()
sender := contract.Caller()
// cross chain param
originToken := false
crossChainDenom := ""
// cross-chain origin token
if value.Cmp(big.NewInt(0)) == 1 && args.Token.String() == fxtypes.EmptyEvmAddress {
totalAmount := big.NewInt(0).Add(args.Amount, args.Fee)
if totalAmount.Cmp(value) != 0 {
return nil, errors.New("amount + fee not equal msg.value")
}
crossChainDenom, err = c.handlerOriginToken(ctx, evm, sender, totalAmount)
if err != nil {
return nil, err
}
// origin token flag is true when cross chain evm denom
originToken = true
} else {
crossChainDenom, err = c.handlerERC20Token(ctx, evm, args.Token, sender, big.NewInt(0).Add(args.Amount, args.Fee))
if err != nil {
return nil, err
}
}
fxTarget := fxtypes.ParseFxTarget(fxtypes.Byte32ToString(args.Target))
amountCoin := sdk.NewCoin(crossChainDenom, sdkmath.NewIntFromBigInt(args.Amount))
feeCoin := sdk.NewCoin(crossChainDenom, sdkmath.NewIntFromBigInt(args.Fee))
if err := c.handlerCrossChain(ctx, sender.Bytes(), args.Receipt, amountCoin, feeCoin, fxTarget, args.Memo, originToken); err != nil {
return nil, err
}
// add event log
if err := c.AddLog(evm, CrossChainEvent, []common.Hash{sender.Hash(), args.Token.Hash()},
crossChainDenom, args.Receipt, args.Amount, args.Fee, args.Target, args.Memo); err != nil {
return nil, err
}
// add cross chain events
crossChainEvents(ctx, sender, args.Token, args.Receipt, fxtypes.Byte32ToString(args.Target),
crossChainDenom, args.Memo, args.Amount, args.Fee)
return CrossChainMethod.Outputs.Pack(true)
}
func (c *Contract) handlerOriginToken(ctx sdk.Context, evm *vm.EVM, sender common.Address, amount *big.Int) (string, error) {
crossChainDenom := c.evmKeeper.GetParams(ctx).EvmDenom
// NOTE: stateDB sub sender balance,but bank keeper not update.
// so mint token to crosschain, end of stateDB commit will sub balance from bank keeper.
// if only allow depth 1, the sender is origin sender, we can sub balance from bank keeper and not need burn/mint coin
evm.StateDB.SubBalance(c.Address(), amount)
totalCoin := sdk.NewCoins(sdk.NewCoin(crossChainDenom, sdkmath.NewIntFromBigInt(amount)))
if err := c.bankKeeper.MintCoins(ctx, evmtypes.ModuleName, totalCoin); err != nil {
return "", fmt.Errorf("mint: %s", err.Error())
}
if err := c.bankKeeper.SendCoinsFromModuleToAccount(ctx, evmtypes.ModuleName, sender.Bytes(), totalCoin); err != nil {
return "", fmt.Errorf("send account: %s", err.Error())
}
return crossChainDenom, nil
}
func (c *Contract) handlerERC20Token(ctx sdk.Context, evm *vm.EVM, token, sender common.Address, amount *big.Int) (string, error) {
// contract token
tokenPair, found := c.erc20Keeper.GetTokenPairByAddress(ctx, token)
if !found {
return "", fmt.Errorf("token pair not found: %s", token.String())
}
crossChainDenom := tokenPair.GetDenom()
// transferFrom to erc20 module
if err := NewContractCall(ctx, evm, c.Address(), token).ERC20TransferFrom(sender, c.erc20Keeper.ModuleAddress(), amount); err != nil {
return "", err
}
if err := c.convertERC20(ctx, evm, tokenPair, sdk.NewCoin(crossChainDenom, sdkmath.NewIntFromBigInt(amount)), sender); err != nil {
return "", err
}
return crossChainDenom, nil
}
func (c *Contract) convertERC20(
ctx sdk.Context,
evm *vm.EVM,
tokenPair erc20types.TokenPair,
amount sdk.Coin,
receiver common.Address,
) error {
if tokenPair.IsNativeCoin() {
err := NewContractCall(ctx, evm, c.erc20Keeper.ModuleAddress(), tokenPair.GetERC20Contract()).ERC20Burn(amount.Amount.BigInt())
if err != nil {
return err
}
if tokenPair.GetDenom() == fxtypes.DefaultDenom {
// cache token contract balance
evm.StateDB.GetBalance(tokenPair.GetERC20Contract())
err := c.bankKeeper.SendCoinsFromAccountToModule(ctx, tokenPair.GetERC20Contract().Bytes(), erc20types.ModuleName, sdk.NewCoins(amount))
if err != nil {
return fmt.Errorf("send module: %s", err.Error())
}
// evm stateDB sub token contract balance
evm.StateDB.SubBalance(tokenPair.GetERC20Contract(), amount.Amount.BigInt())
}
} else if tokenPair.IsNativeERC20() {
err := c.bankKeeper.MintCoins(ctx, erc20types.ModuleName, sdk.NewCoins(amount))
if err != nil {
return fmt.Errorf("mint: %s", err.Error())
}
} else {
return erc20types.ErrUndefinedOwner
}
sendAddr := sdk.AccAddress(receiver.Bytes())
if err := c.bankKeeper.SendCoinsFromModuleToAccount(ctx, erc20types.ModuleName, sendAddr, sdk.NewCoins(amount)); err != nil {
return fmt.Errorf("send account: %s", err.Error())
}
return nil
}
// handlerCrossChain cross chain handler
// originToken is true represent cross chain denom(FX)
// when refund it, will not refund to evm token
// NOTE: fip20CrossChain only use for contract token, so origin token flag always false
func (c *Contract) handlerCrossChain(
ctx sdk.Context,
from sdk.AccAddress,
receipt string,
amount, fee sdk.Coin,
fxTarget fxtypes.FxTarget,
memo string,
originToken bool,
) error {
total := sdk.NewCoin(amount.Denom, amount.Amount.Add(fee.Amount))
// convert denom to target coin
targetCoin, err := c.erc20Keeper.ConvertDenomToTarget(ctx, from.Bytes(), total, fxTarget)
if err != nil {
return fmt.Errorf("convert denom: %s", err.Error())
}
amount.Denom = targetCoin.Denom
fee.Denom = targetCoin.Denom
if fxTarget.IsIBC() {
return c.ibcTransfer(ctx, from.Bytes(), receipt, amount, fee, fxTarget, memo, originToken)
}
return c.outgoingTransfer(ctx, from.Bytes(), receipt, amount, fee, fxTarget, originToken)
}
func (c *Contract) outgoingTransfer(
ctx sdk.Context,
from sdk.AccAddress,
to string,
amount, fee sdk.Coin,
fxTarget fxtypes.FxTarget,
originToken bool,
) error {
if c.router == nil {
return errors.New("cross chain router empty")
}
route, has := c.router.GetRoute(fxTarget.GetTarget())
if !has {
return errors.New("invalid target")
}
if err := route.TransferAfter(ctx, from, to, amount, fee, originToken); err != nil {
return fmt.Errorf("cross chain error: %s", err.Error())
}
return nil
}
func (c *Contract) ibcTransfer(
ctx sdk.Context,
from sdk.AccAddress,
to string,
amount, fee sdk.Coin,
fxTarget fxtypes.FxTarget,
memo string,
originToken bool,
) error {
if !fee.IsZero() {
return fmt.Errorf("ibc transfer fee must be zero: %s", fee.String())
}
if strings.ToLower(fxTarget.Prefix) == fxtypes.EthereumAddressPrefix {
if err := fxtypes.ValidateEthereumAddress(to); err != nil {
return fmt.Errorf("invalid to address: %s", to)
}
} else {
if _, err := sdk.GetFromBech32(to, fxTarget.Prefix); err != nil {
return fmt.Errorf("invalid to address: %s", to)
}
}
ibcTimeoutTimestamp := uint64(ctx.BlockTime().UnixNano()) + uint64(c.erc20Keeper.GetIbcTimeout(ctx))
transferResponse, err := c.ibcTransferKeeper.Transfer(sdk.WrapSDKContext(ctx),
transfertypes.NewMsgTransfer(
fxTarget.SourcePort,
fxTarget.SourceChannel,
amount,
from.String(),
to,
ibcclienttypes.ZeroHeight(),
ibcTimeoutTimestamp,
memo,
),
)
if err != nil {
return fmt.Errorf("ibc transfer error: %s", err.Error())
}
if !originToken {
c.erc20Keeper.SetIBCTransferRelation(ctx, fxTarget.SourceChannel, transferResponse.GetSequence())
}
return nil
}
// transferCrossChainEvents use for fip20 cross chain
// Deprecated
func fip20CrossChainEvents(ctx sdk.Context, from, token common.Address, recipient, target, denom string, amount, fee *big.Int) {
ctx.EventManager().EmitEvent(sdk.NewEvent(
EventTypeRelayTransferCrossChain,
sdk.NewAttribute(AttributeKeyFrom, from.String()),
sdk.NewAttribute(AttributeKeyRecipient, recipient),
sdk.NewAttribute(sdk.AttributeKeyAmount, amount.String()),
sdk.NewAttribute(sdk.AttributeKeyFee, fee.String()),
sdk.NewAttribute(AttributeKeyTarget, target),
sdk.NewAttribute(AttributeKeyTokenAddress, token.String()),
sdk.NewAttribute(AttributeKeyDenom, denom),
))
telemetry.IncrCounterWithLabels(
[]string{"relay_transfer_cross_chain"},
1,
[]metrics.Label{
telemetry.NewLabel("erc20", token.String()),
telemetry.NewLabel("denom", denom),
telemetry.NewLabel("target", target),
},
)
}
func crossChainEvents(ctx sdk.Context, from, token common.Address, recipient, target, denom, memo string, amount, fee *big.Int) {
ctx.EventManager().EmitEvent(sdk.NewEvent(
EventTypeCrossChain,
sdk.NewAttribute(AttributeKeyFrom, from.String()),
sdk.NewAttribute(AttributeKeyRecipient, recipient),
sdk.NewAttribute(sdk.AttributeKeyAmount, amount.String()),
sdk.NewAttribute(sdk.AttributeKeyFee, fee.String()),
sdk.NewAttribute(AttributeKeyTarget, target),
sdk.NewAttribute(AttributeKeyTokenAddress, token.String()),
sdk.NewAttribute(AttributeKeyDenom, denom),
sdk.NewAttribute(AttributeKeyMemo, memo),
))
}