feat: add a switch for enabling erc20 swap function

CHANGELOG.md

@@ -47,6 +47,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 * [\#402](https://github.com/irisnet/irismod/pull/402) Add cli for swap from/to ERC20.
 * [\#404](https://github.com/irisnet/irismod/pull/404) Implement token Balances api.
 * [\#405](https://github.com/irisnet/irismod/pull/405) Rolled back the cosmos-sdk version to v0.47.9.
+* [\#409](https://github.com/irisnet/irismod/pull/409) feat: add a switch for enabling erc20 swap function.
 
 ### Bug Fixes
 

modules/token/keeper/erc20.go

@@ -99,6 +99,10 @@ func (k Keeper) SwapFromERC20(
 	receiver sdk.AccAddress,
 	wantedAmount sdk.Coin,
 ) error {
+	if !k.ERC20Enabled(ctx) {
+		return types.ErrERC20Disabled
+	}
+
 	token, err := k.getTokenByMinUnit(ctx, wantedAmount.Denom)
 	if err != nil {
 		return err
@@ -146,6 +150,10 @@ func (k Keeper) SwapToERC20(
 	receiver common.Address,
 	amount sdk.Coin,
 ) error {
+	if !k.ERC20Enabled(ctx) {
+		return types.ErrERC20Disabled
+	}
+
 	receiverAcc := k.accountKeeper.GetAccount(ctx, sdk.AccAddress(receiver.Bytes()))
 	if receiverAcc != nil {
 		if !k.evmKeeper.SupportedKey(receiverAcc.GetPubKey()) {

modules/token/keeper/evm_hook.go

@@ -28,6 +28,7 @@ type erc20Hook struct {
 //
 // Return type: error
 func (hook erc20Hook) PostTxProcessing(ctx sdk.Context, msg core.Message, receipt *ethtypes.Receipt) error {
+	disable := !hook.k.ERC20Enabled(ctx)
 	erc20 := contracts.ERC20TokenContract.ABI
 	for _, log := range receipt.Logs {
 		// Note: the `SwapToNative` event contains 1 topics
@@ -54,6 +55,10 @@ func (hook erc20Hook) PostTxProcessing(ctx sdk.Context, msg core.Message, receip
 			continue
 		}
 
+		if disable {
+			return types.ErrERC20Disabled
+		}
+
 		eventArgs, err := erc20.Unpack(event.Name, log.Data)
 		if err != nil {
 			return errorsmod.Wrap(types.ErrInvalidContract, "failed to unpack SwapToNative event")

modules/token/keeper/params.go

@@ -34,3 +34,9 @@ func (k Keeper) SetParams(ctx sdk.Context, params v1.Params) error {
 
 	return nil
 }
+
+// ERC20Enabled returns true if ERC20 is enabled
+func (k Keeper) ERC20Enabled(ctx sdk.Context) bool {
+	params := k.GetParams(ctx)
+	return params.EnableErc20
+}

modules/token/types/errors.go

@@ -31,4 +31,5 @@ var (
 	ErrERC20NotDeployed     = errorsmod.Register(ModuleName, 23, "erc20 contract not deployed")
 	ErrUnsupportedKey       = errorsmod.Register(ModuleName, 24, "evm not supported public key")
 	ErrInvalidContract      = errorsmod.Register(ModuleName, 25, "invalid contract")
+	ErrERC20Disabled        = errorsmod.Register(ModuleName, 26, "erc20 swap is disabled")
 )

modules/token/types/v1/params.go

@@ -24,10 +24,11 @@ func DefaultParams() Params {
 		TokenTaxRate:      sdk.NewDecWithPrec(4, 1), // 0.4 (40%)
 		IssueTokenBaseFee: sdk.NewCoin(defaultToken.Symbol, sdk.NewInt(60000)),
 		MintTokenFeeRatio: sdk.NewDecWithPrec(1, 1), // 0.1 (10%)
+		EnableErc20:       true,
 	}
 }
 
-// ValidateParams validates the given params
+// Validate validates the given params
 func (p Params) Validate() error {
 	if err := validateTaxRate(p.TokenTaxRate); err != nil {
 		return err