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msg_server.go
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/
msg_server.go
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package keeper
import (
"context"
sdk "github.com/cosmos/cosmos-sdk/types"
sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
"github.com/ethereum/go-ethereum/common"
"github.com/tharsis/evmos/x/intrarelayer/types"
"github.com/tharsis/evmos/x/intrarelayer/types/contracts"
)
var _ types.MsgServer = &Keeper{}
// ConvertCoin converts ERC20 tokens into Cosmos-native Coins for both
// Cosmos-native and ERC20 TokenPair Owners
func (k Keeper) ConvertCoin(goCtx context.Context, msg *types.MsgConvertCoin) (*types.MsgConvertCoinResponse, error) {
ctx := sdk.UnwrapSDKContext(goCtx)
k.evmKeeper.WithContext(ctx)
// Error checked during msg validation
receiver := common.HexToAddress(msg.Receiver)
sender, _ := sdk.AccAddressFromBech32(msg.Sender)
pair, err := k.MintingEnabled(ctx, sender, receiver.Bytes(), msg.Coin.Denom)
if err != nil {
return nil, err
}
// Check ownership
switch {
case pair.IsNativeCoin():
// case 1.1
return k.convertCoinNativeCoin(ctx, pair, msg, receiver, sender)
case pair.IsNativeERC20():
// case 2.2
return k.convertCoinNativeERC20(ctx, pair, msg, receiver, sender)
default:
return nil, types.ErrUndefinedOwner
}
}
// ConvertERC20 converts ERC20 tokens into Cosmos-native Coins for both
// Cosmos-native and ERC20 TokenPair Owners
func (k Keeper) ConvertERC20(goCtx context.Context, msg *types.MsgConvertERC20) (*types.MsgConvertERC20Response, error) {
ctx := sdk.UnwrapSDKContext(goCtx)
k.evmKeeper.WithContext(ctx)
// Error checked during msg validation
receiver, _ := sdk.AccAddressFromBech32(msg.Receiver)
sender := common.HexToAddress(msg.Sender)
pair, err := k.MintingEnabled(ctx, sender.Bytes(), receiver, msg.ContractAddress)
if err != nil {
return nil, err
}
// Check ownership
switch {
case pair.IsNativeCoin():
// case 1.2
return k.convertERC20NativeCoin(ctx, pair, msg, receiver, sender)
case pair.IsNativeERC20():
// case 2.1
return k.convertERC20NativeToken(ctx, pair, msg, receiver, sender)
default:
return nil, types.ErrUndefinedOwner
}
}
// convertCoinNativeCoin handles the Coin conversion flow for a native coin token pair:
// - Escrow Coins on module account (Coins are not burned)
// - Mint Tokens and send to receiver
func (k Keeper) convertCoinNativeCoin(
ctx sdk.Context,
pair types.TokenPair,
msg *types.MsgConvertCoin,
receiver common.Address,
sender sdk.AccAddress,
) (*types.MsgConvertCoinResponse, error) {
// NOTE: ignore validation from NewCoin constructor
coins := sdk.Coins{msg.Coin}
erc20 := contracts.ERC20BurnableAndMintableContract.ABI
contract := pair.GetERC20Contract()
// Escrow Coins on module account
if err := k.bankKeeper.SendCoinsFromAccountToModule(ctx, sender, types.ModuleName, coins); err != nil {
return nil, sdkerrors.Wrap(err, "failed to escrow coins")
}
// Mint Tokens and send to receiver
_, err := k.CallEVM(ctx, erc20, types.ModuleAddress, contract, "mint", receiver, msg.Coin.Amount.BigInt())
if err != nil {
return nil, err
}
ctx.EventManager().EmitEvents(
sdk.Events{
sdk.NewEvent(
types.EventTypeConvertCoin,
sdk.NewAttribute(sdk.AttributeKeySender, msg.Sender),
sdk.NewAttribute(types.AttributeKeyReceiver, msg.Receiver),
sdk.NewAttribute(sdk.AttributeKeyAmount, msg.Coin.Amount.String()),
sdk.NewAttribute(types.AttributeKeyCosmosCoin, msg.Coin.Denom),
sdk.NewAttribute(types.AttributeKeyERC20Token, pair.Erc20Address),
),
},
)
return &types.MsgConvertCoinResponse{}, nil
}
// convertCoinNativeERC20 handles the Coin conversion flow for a native ERC20 token pair:
// - Escrow Coins on module account
// - Unescrow Tokens that have been previously escrowed with ConvertERC20 and send to receiver
// - Burn escrowed Coins
func (k Keeper) convertCoinNativeERC20(
ctx sdk.Context,
pair types.TokenPair,
msg *types.MsgConvertCoin,
receiver common.Address,
sender sdk.AccAddress,
) (*types.MsgConvertCoinResponse, error) {
// NOTE: ignore validation from NewCoin constructor
coins := sdk.Coins{msg.Coin}
erc20 := contracts.ERC20BurnableAndMintableContract.ABI
contract := pair.GetERC20Contract()
// Escrow Coins on module account
if err := k.bankKeeper.SendCoinsFromAccountToModule(ctx, sender, types.ModuleName, coins); err != nil {
return nil, sdkerrors.Wrap(err, "failed to escrow coins")
}
// Unescrow Tokens and send to receiver
res, err := k.CallEVM(ctx, erc20, types.ModuleAddress, contract, "transfer", receiver, msg.Coin.Amount.BigInt())
if err != nil {
return nil, err
}
// Check unpackedRet execution
var unpackedRet types.ERC20BoolResponse
if err := erc20.UnpackIntoInterface(&unpackedRet, "transfer", res.Ret); err != nil {
return nil, err
}
if !unpackedRet.Value {
return nil, sdkerrors.Wrap(sdkerrors.ErrLogic, "failed to execute unescrow tokens from user")
}
// Burn escrowed Coins
err = k.bankKeeper.BurnCoins(ctx, types.ModuleName, coins)
if err != nil {
return nil, sdkerrors.Wrap(err, "failed to burn coins")
}
ctx.EventManager().EmitEvents(
sdk.Events{
sdk.NewEvent(
types.EventTypeConvertCoin,
sdk.NewAttribute(sdk.AttributeKeySender, msg.Sender),
sdk.NewAttribute(types.AttributeKeyReceiver, msg.Receiver),
sdk.NewAttribute(sdk.AttributeKeyAmount, msg.Coin.Amount.String()),
sdk.NewAttribute(types.AttributeKeyCosmosCoin, msg.Coin.Denom),
sdk.NewAttribute(types.AttributeKeyERC20Token, pair.Erc20Address),
),
},
)
return &types.MsgConvertCoinResponse{}, nil
}
// convertERC20NativeCoin handles the erc20 conversion flow for a native coin token pair:
// - Escrow tokens on module account
// - Burn escrowed tokens
// - Unescrow coins that have been previously escrowed with ConvertCoin
func (k Keeper) convertERC20NativeCoin(
ctx sdk.Context,
pair types.TokenPair,
msg *types.MsgConvertERC20,
receiver sdk.AccAddress,
sender common.Address,
) (*types.MsgConvertERC20Response, error) {
// NOTE: coin fields already validated
coins := sdk.Coins{sdk.Coin{Denom: pair.Denom, Amount: msg.Amount}}
erc20 := contracts.ERC20BurnableAndMintableContract.ABI
contract := pair.GetERC20Contract()
_, err := k.CallEVM(ctx, erc20, types.ModuleAddress, contract, "burnCoins", sender, msg.Amount.BigInt())
if err != nil {
return nil, err
}
// Unescrow Coins and send to receiver
if err := k.bankKeeper.SendCoinsFromModuleToAccount(ctx, types.ModuleName, receiver, coins); err != nil {
return nil, err
}
ctx.EventManager().EmitEvents(
sdk.Events{
sdk.NewEvent(
types.EventTypeConvertERC20,
sdk.NewAttribute(sdk.AttributeKeySender, msg.Sender),
sdk.NewAttribute(types.AttributeKeyReceiver, msg.Receiver),
sdk.NewAttribute(sdk.AttributeKeyAmount, msg.Amount.String()),
sdk.NewAttribute(types.AttributeKeyCosmosCoin, pair.Denom),
sdk.NewAttribute(types.AttributeKeyERC20Token, msg.ContractAddress),
),
},
)
return &types.MsgConvertERC20Response{}, nil
}
// convertERC20NativeToken handles the erc20 conversion flow for a native erc20 token pair:
// - Escrow tokens on module account (Don't burn as module is not contract owner)
// - Mint coins on module
// - Send minted coins to the receiver
func (k Keeper) convertERC20NativeToken(
ctx sdk.Context,
pair types.TokenPair,
msg *types.MsgConvertERC20,
receiver sdk.AccAddress,
sender common.Address,
) (*types.MsgConvertERC20Response, error) {
// NOTE: coin fields already validated
coins := sdk.Coins{sdk.Coin{Denom: pair.Denom, Amount: msg.Amount}}
erc20 := contracts.ERC20BurnableAndMintableContract.ABI
contract := pair.GetERC20Contract()
// Escrow tokens on module account
transferData, err := erc20.Pack("transfer", types.ModuleAddress, msg.Amount.BigInt())
if err != nil {
return nil, err
}
res, err := k.CallEVMWithPayload(ctx, sender, &contract, transferData)
if err != nil {
return nil, err
}
// Check unpackedRet execution
var unpackedRet types.ERC20BoolResponse
if err := erc20.UnpackIntoInterface(&unpackedRet, "transfer", res.Ret); err != nil {
return nil, err
}
if !unpackedRet.Value {
return nil, sdkerrors.Wrap(sdkerrors.ErrLogic, "failed to execute transfer")
}
// Mint coins
if err := k.bankKeeper.MintCoins(ctx, types.ModuleName, coins); err != nil {
return nil, err
}
// Send minted coins to the receiver
if err := k.bankKeeper.SendCoinsFromModuleToAccount(ctx, types.ModuleName, receiver, coins); err != nil {
return nil, err
}
ctx.EventManager().EmitEvents(
sdk.Events{
sdk.NewEvent(
types.EventTypeConvertERC20,
sdk.NewAttribute(sdk.AttributeKeySender, msg.Sender),
sdk.NewAttribute(types.AttributeKeyReceiver, msg.Receiver),
sdk.NewAttribute(sdk.AttributeKeyAmount, msg.Amount.String()),
sdk.NewAttribute(types.AttributeKeyCosmosCoin, pair.Denom),
sdk.NewAttribute(types.AttributeKeyERC20Token, msg.ContractAddress),
),
},
)
return &types.MsgConvertERC20Response{}, nil
}