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proposals.go
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proposals.go
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package keeper
import (
errorsmod "cosmossdk.io/errors"
sdk "github.com/cosmos/cosmos-sdk/types"
errortypes "github.com/cosmos/cosmos-sdk/types/errors"
banktypes "github.com/cosmos/cosmos-sdk/x/bank/types"
"github.com/ethereum/go-ethereum/common"
"github.com/EscanBE/evermint/v12/x/erc20/types"
)
// RegisterCoin deploys an erc20 contract and creates the token pair for the
// existing cosmos coin
func (k Keeper) RegisterCoin(
ctx sdk.Context,
coinMetadata banktypes.Metadata,
) (*types.TokenPair, error) {
// Check if denomination is already registered
if k.IsDenomRegistered(ctx, coinMetadata.Name) {
return nil, errorsmod.Wrapf(
types.ErrTokenPairAlreadyExists, "coin denomination already registered: %s", coinMetadata.Name,
)
}
// Check if the coin exists by ensuring the supply is set
if !k.bankKeeper.HasSupply(ctx, coinMetadata.Base) {
return nil, errorsmod.Wrapf(
errortypes.ErrInvalidCoins, "base denomination '%s' cannot have a supply of 0", coinMetadata.Base,
)
}
if err := k.verifyMetadata(ctx, coinMetadata); err != nil {
return nil, errorsmod.Wrapf(
types.ErrInternalTokenPair, "coin metadata is invalid %s", coinMetadata.Name,
)
}
addr, err := k.DeployERC20Contract(ctx, coinMetadata)
if err != nil {
return nil, errorsmod.Wrap(
err, "failed to create wrapped coin denom metadata for ERC20",
)
}
pair := types.NewTokenPair(addr, coinMetadata.Base, types.OWNER_MODULE)
k.SetTokenPair(ctx, pair)
k.SetDenomMap(ctx, pair.Denom, pair.GetID())
k.SetERC20Map(ctx, common.HexToAddress(pair.Erc20Address), pair.GetID())
return &pair, nil
}
// RegisterERC20 creates a Cosmos coin and registers the token pair between the
// coin and the ERC20
func (k Keeper) RegisterERC20(
ctx sdk.Context,
contract common.Address,
) (*types.TokenPair, error) {
// Check if ERC20 is already registered
if k.IsERC20Registered(ctx, contract) {
return nil, errorsmod.Wrapf(
types.ErrTokenPairAlreadyExists, "token ERC20 contract already registered: %s", contract.String(),
)
}
metadata, err := k.CreateCoinMetadata(ctx, contract)
if err != nil {
return nil, errorsmod.Wrap(
err, "failed to create wrapped coin denom metadata for ERC20",
)
}
pair := types.NewTokenPair(contract, metadata.Name, types.OWNER_EXTERNAL)
k.SetTokenPair(ctx, pair)
k.SetDenomMap(ctx, pair.Denom, pair.GetID())
k.SetERC20Map(ctx, common.HexToAddress(pair.Erc20Address), pair.GetID())
return &pair, nil
}
// CreateCoinMetadata generates the metadata to represent the ERC20 token on current chain.
func (k Keeper) CreateCoinMetadata(
ctx sdk.Context,
contract common.Address,
) (*banktypes.Metadata, error) {
strContract := contract.String()
erc20Data, err := k.QueryERC20(ctx, contract)
if err != nil {
return nil, err
}
// Check if metadata already exists
_, found := k.bankKeeper.GetDenomMetaData(ctx, types.CreateDenom(strContract))
if found {
return nil, errorsmod.Wrap(
types.ErrInternalTokenPair, "denom metadata already registered",
)
}
if k.IsDenomRegistered(ctx, types.CreateDenom(strContract)) {
return nil, errorsmod.Wrapf(
types.ErrInternalTokenPair, "coin denomination already registered: %s", erc20Data.Name,
)
}
// base denomination
base := types.CreateDenom(strContract)
// create a bank denom metadata based on the ERC20 token ABI details
// metadata name is should always be the contract since it's the key
// to the bank store
metadata := banktypes.Metadata{
Description: types.CreateDenomDescription(strContract),
Base: base,
// NOTE: Denom units MUST be increasing
DenomUnits: []*banktypes.DenomUnit{
{
Denom: base,
Exponent: 0,
},
},
Name: types.CreateDenom(strContract),
Symbol: erc20Data.Symbol,
Display: base,
}
// only append metadata if decimals > 0, otherwise validation fails
if erc20Data.Decimals > 0 {
nameSanitized := types.SanitizeERC20Name(erc20Data.Name)
metadata.DenomUnits = append(
metadata.DenomUnits,
&banktypes.DenomUnit{
Denom: nameSanitized,
Exponent: uint32(erc20Data.Decimals),
},
)
metadata.Display = nameSanitized
}
if err := metadata.Validate(); err != nil {
return nil, errorsmod.Wrapf(
err, "ERC20 token data is invalid for contract %s", strContract,
)
}
k.bankKeeper.SetDenomMetaData(ctx, metadata)
return &metadata, nil
}
// ToggleConversion toggles conversion for a given token pair
func (k Keeper) ToggleConversion(
ctx sdk.Context,
token string,
) (types.TokenPair, error) {
id := k.GetTokenPairID(ctx, token)
if len(id) == 0 {
return types.TokenPair{}, errorsmod.Wrapf(
types.ErrTokenPairNotFound, "token '%s' not registered by id", token,
)
}
pair, found := k.GetTokenPair(ctx, id)
if !found {
return types.TokenPair{}, errorsmod.Wrapf(
types.ErrTokenPairNotFound, "token '%s' not registered", token,
)
}
pair.Enabled = !pair.Enabled
k.SetTokenPair(ctx, pair)
return pair, nil
}
// verifyMetadata verifies if the metadata matches the existing one, if not it
// sets it to the store
func (k Keeper) verifyMetadata(
ctx sdk.Context,
coinMetadata banktypes.Metadata,
) error {
meta, found := k.bankKeeper.GetDenomMetaData(ctx, coinMetadata.Base)
if !found {
k.bankKeeper.SetDenomMetaData(ctx, coinMetadata)
return nil
}
// If it already existed, check that is equal to what is stored
return types.EqualMetadata(meta, coinMetadata)
}