mirror of
https://github.com/0glabs/0g-chain.git
synced 2024-11-14 03:55:19 +00:00
272 lines
7.5 KiB
Go
272 lines
7.5 KiB
Go
package keeper
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import (
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"encoding/hex"
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"fmt"
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"math/big"
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errorsmod "cosmossdk.io/errors"
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sdk "github.com/cosmos/cosmos-sdk/types"
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"github.com/ethereum/go-ethereum/core/vm"
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"github.com/ethereum/go-ethereum/crypto"
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evmtypes "github.com/evmos/ethermint/x/evm/types"
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"google.golang.org/grpc/codes"
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"google.golang.org/grpc/status"
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"github.com/0glabs/0g-chain/x/evmutil/types"
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)
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const (
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erc20BalanceOfMethod = "balanceOf"
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erc20BurnMethod = "burn"
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erc20MintMethod = "mint"
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erc20TotalSupplyMethod = "totalSupply"
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)
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// DeployTestMintableERC20Contract deploys an ERC20 contract on the EVM as the
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// module account and returns the address of the contract. This contract has
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// minting permissions for the module account.
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// Derived from tharsis/evmos
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// https://github.com/tharsis/evmos/blob/ee54f496551df937915ff6f74a94732a35abc505/x/erc20/keeper/evm.go
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func (k Keeper) DeployTestMintableERC20Contract(
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ctx sdk.Context,
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name string,
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symbol string,
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decimals uint8,
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) (types.InternalEVMAddress, error) {
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ctorArgs, err := types.ERC20MintableBurnableContract.ABI.Pack(
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"", // Empty string for contract constructor
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name,
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symbol,
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decimals,
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)
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if err != nil {
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return types.InternalEVMAddress{}, errorsmod.Wrapf(err, "token %v is invalid", name)
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}
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data := make([]byte, len(types.ERC20MintableBurnableContract.Bin)+len(ctorArgs))
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copy(
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data[:len(types.ERC20MintableBurnableContract.Bin)],
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types.ERC20MintableBurnableContract.Bin,
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)
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copy(
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data[len(types.ERC20MintableBurnableContract.Bin):],
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ctorArgs,
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)
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nonce, err := k.accountKeeper.GetSequence(ctx, types.ModuleEVMAddress.Bytes())
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if err != nil {
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return types.InternalEVMAddress{}, err
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}
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contractAddr := crypto.CreateAddress(types.ModuleEVMAddress, nonce)
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_, err = k.CallEVMWithData(ctx, types.ModuleEVMAddress, nil, data)
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if err != nil {
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return types.InternalEVMAddress{}, fmt.Errorf("failed to deploy ERC20 for %s: %w", name, err)
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}
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return types.NewInternalEVMAddress(contractAddr), nil
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}
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// DeployZgChainWrappedCosmosCoinERC20Contract validates token details and then deploys an ERC20
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// contract with the token metadata.
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// This method does NOT check if a token for the provided SdkDenom has already been deployed.
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func (k Keeper) DeployZgChainWrappedCosmosCoinERC20Contract(
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ctx sdk.Context,
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token types.AllowedCosmosCoinERC20Token,
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) (types.InternalEVMAddress, error) {
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if err := token.Validate(); err != nil {
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return types.InternalEVMAddress{}, errorsmod.Wrapf(err, "failed to deploy erc20 for sdk denom %s", token.CosmosDenom)
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}
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packedAbi, err := types.ERC20ZgChainWrappedCosmosCoinContract.ABI.Pack(
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"", // Empty string for contract constructor
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token.Name,
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token.Symbol,
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uint8(token.Decimals), // cast to uint8 is safe because of Validate()
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)
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if err != nil {
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return types.InternalEVMAddress{}, errorsmod.Wrapf(err, "failed to pack token with details %+v", token)
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}
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data := make([]byte, len(types.ERC20ZgChainWrappedCosmosCoinContract.Bin)+len(packedAbi))
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copy(
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data[:len(types.ERC20ZgChainWrappedCosmosCoinContract.Bin)],
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types.ERC20ZgChainWrappedCosmosCoinContract.Bin,
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)
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copy(
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data[len(types.ERC20ZgChainWrappedCosmosCoinContract.Bin):],
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packedAbi,
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)
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nonce, err := k.accountKeeper.GetSequence(ctx, types.ModuleEVMAddress.Bytes())
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if err != nil {
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return types.InternalEVMAddress{}, err
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}
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contractAddr := crypto.CreateAddress(types.ModuleEVMAddress, nonce)
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_, err = k.CallEVMWithData(ctx, types.ModuleEVMAddress, nil, data)
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if err != nil {
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return types.InternalEVMAddress{}, fmt.Errorf("failed to deploy ERC20 %s (nonce=%d, data=%s): %s", token.Name, nonce, hex.EncodeToString(data), err)
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}
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return types.NewInternalEVMAddress(contractAddr), nil
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}
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// GetOrDeployCosmosCoinERC20Contract checks the module store for a deployed contract for the given
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// token info and returns it if preset. Otherwise, it deploys and registers the contract.
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func (k *Keeper) GetOrDeployCosmosCoinERC20Contract(
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ctx sdk.Context,
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tokenInfo types.AllowedCosmosCoinERC20Token,
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) (types.InternalEVMAddress, error) {
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contractAddress, found := k.GetDeployedCosmosCoinContract(ctx, tokenInfo.CosmosDenom)
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if found {
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// contract has already been deployed
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return contractAddress, nil
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}
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// deploy a new contract
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contractAddress, err := k.DeployZgChainWrappedCosmosCoinERC20Contract(ctx, tokenInfo)
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if err != nil {
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return contractAddress, err
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}
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// register the contract to the module store
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err = k.SetDeployedCosmosCoinContract(ctx, tokenInfo.CosmosDenom, contractAddress)
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// TODO: emit event that contract was deployed
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return contractAddress, err
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}
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// MintERC20 mints the given amount of an ERC20 token to an address. This is
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// unchecked and should only be called after permission and enabled ERC20 checks.
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func (k Keeper) MintERC20(
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ctx sdk.Context,
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contractAddr types.InternalEVMAddress,
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receiver types.InternalEVMAddress,
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amount *big.Int,
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) error {
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_, err := k.CallEVM(
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ctx,
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types.ERC20MintableBurnableContract.ABI,
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types.ModuleEVMAddress,
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contractAddr,
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erc20MintMethod,
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// Mint ERC20 args
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receiver.Address,
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amount,
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)
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return err
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}
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// BurnERC20 burns the token amount from the initiator's balance.
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func (k Keeper) BurnERC20(
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ctx sdk.Context,
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contractAddr types.InternalEVMAddress,
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initiator types.InternalEVMAddress,
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amount *big.Int,
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) error {
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_, err := k.CallEVM(
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ctx,
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types.ERC20ZgChainWrappedCosmosCoinContract.ABI,
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types.ModuleEVMAddress,
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contractAddr,
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erc20BurnMethod,
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// Burn ERC20 args
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initiator.Address,
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amount,
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)
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return err
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}
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// QueryERC20BalanceOf makes a contract call to the balanceOf method of the ERC20 contract to get
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// the ERC20 balance of the given account.
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func (k Keeper) QueryERC20BalanceOf(
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ctx sdk.Context,
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contractAddr types.InternalEVMAddress,
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account types.InternalEVMAddress,
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) (*big.Int, error) {
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res, err := k.CallEVM(
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ctx,
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types.ERC20MintableBurnableContract.ABI,
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types.ModuleEVMAddress,
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contractAddr,
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erc20BalanceOfMethod,
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// balanceOf ERC20 args
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account.Address,
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)
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if err != nil {
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return nil, err
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}
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return unpackERC20ResToBigInt(res, erc20BalanceOfMethod)
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}
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// QueryERC20TotalSupply makes a contract call to the totalSupply method of the ERC20 contract to
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// get the total supply of the token.
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func (k Keeper) QueryERC20TotalSupply(
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ctx sdk.Context,
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contractAddr types.InternalEVMAddress,
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) (*big.Int, error) {
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res, err := k.CallEVM(
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ctx,
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types.ERC20ZgChainWrappedCosmosCoinContract.ABI,
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types.ModuleEVMAddress,
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contractAddr,
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erc20TotalSupplyMethod,
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// totalSupply takes no args
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)
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if err != nil {
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return nil, err
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}
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return unpackERC20ResToBigInt(res, erc20TotalSupplyMethod)
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}
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func unpackERC20ResToBigInt(res *evmtypes.MsgEthereumTxResponse, methodName string) (*big.Int, error) {
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if res.Failed() {
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if res.VmError == vm.ErrExecutionReverted.Error() {
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// Unpacks revert
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return nil, evmtypes.NewExecErrorWithReason(res.Ret)
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}
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return nil, status.Error(codes.Internal, res.VmError)
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}
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if len(res.Ret) == 0 {
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return nil, fmt.Errorf("failed to unpack method %s: expected response to be big.Int but found nil", methodName)
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}
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anyOutput, err := types.ERC20MintableBurnableContract.ABI.Unpack(methodName, res.Ret)
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if err != nil {
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return nil, fmt.Errorf(
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"failed to unpack method %v response: %w",
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methodName,
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err,
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)
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}
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if len(anyOutput) != 1 {
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return nil, fmt.Errorf(
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"invalid ERC20 %v call return outputs %v, expected %v",
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methodName,
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len(anyOutput),
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1,
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)
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}
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bal, ok := anyOutput[0].(*big.Int)
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if !ok {
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return nil, fmt.Errorf(
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"invalid ERC20 return type %T, expected %T",
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anyOutput[0],
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&big.Int{},
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)
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}
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return bal, nil
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}
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