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bank_keeper.go
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/
bank_keeper.go
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package keeper
import (
"fmt"
errorsmod "cosmossdk.io/errors"
sdkmath "cosmossdk.io/math"
sdk "github.com/cosmos/cosmos-sdk/types"
sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
evmtypes "github.com/evmos/ethermint/x/evm/types"
"github.com/kava-labs/kava/x/evmutil/types"
)
const (
// EvmDenom is the gas denom used by the evm
EvmDenom = "akava"
// CosmosDenom is the gas denom used by the kava app
CosmosDenom = "ukava"
)
// ConversionMultiplier is the conversion multiplier between akava and ukava
var ConversionMultiplier = sdkmath.NewInt(1_000_000_000_000)
var _ evmtypes.BankKeeper = EvmBankKeeper{}
// EvmBankKeeper is a BankKeeper wrapper for the x/evm module to allow the use
// of the 18 decimal akava coin on the evm.
// x/evm consumes gas and send coins by minting and burning akava coins in its module
// account and then sending the funds to the target account.
// This keeper uses both the ukava coin and a separate akava balance to manage the
// extra percision needed by the evm.
type EvmBankKeeper struct {
akavaKeeper Keeper
bk types.BankKeeper
ak types.AccountKeeper
}
func NewEvmBankKeeper(akavaKeeper Keeper, bk types.BankKeeper, ak types.AccountKeeper) EvmBankKeeper {
return EvmBankKeeper{
akavaKeeper: akavaKeeper,
bk: bk,
ak: ak,
}
}
// GetBalance returns the total **spendable** balance of akava for a given account by address.
func (k EvmBankKeeper) GetBalance(ctx sdk.Context, addr sdk.AccAddress, denom string) sdk.Coin {
if denom != EvmDenom {
panic(fmt.Errorf("only evm denom %s is supported by EvmBankKeeper", EvmDenom))
}
spendableCoins := k.bk.SpendableCoins(ctx, addr)
ukava := spendableCoins.AmountOf(CosmosDenom)
akava := k.akavaKeeper.GetBalance(ctx, addr)
total := ukava.Mul(ConversionMultiplier).Add(akava)
return sdk.NewCoin(EvmDenom, total)
}
// SendCoins transfers akava coins from a AccAddress to an AccAddress.
func (k EvmBankKeeper) SendCoins(ctx sdk.Context, senderAddr sdk.AccAddress, recipientAddr sdk.AccAddress, amt sdk.Coins) error {
// SendCoins method is not used by the evm module, but is required by the
// evmtypes.BankKeeper interface. This must be updated if the evm module
// is updated to use SendCoins.
panic("not implemented")
}
// SendCoinsFromModuleToAccount transfers akava coins from a ModuleAccount to an AccAddress.
// It will panic if the module account does not exist. An error is returned if the recipient
// address is black-listed or if sending the tokens fails.
func (k EvmBankKeeper) SendCoinsFromModuleToAccount(ctx sdk.Context, senderModule string, recipientAddr sdk.AccAddress, amt sdk.Coins) error {
ukava, akava, err := SplitAkavaCoins(amt)
if err != nil {
return err
}
if ukava.Amount.IsPositive() {
if err := k.bk.SendCoinsFromModuleToAccount(ctx, senderModule, recipientAddr, sdk.NewCoins(ukava)); err != nil {
return err
}
}
senderAddr := k.GetModuleAddress(senderModule)
if err := k.ConvertOneUkavaToAkavaIfNeeded(ctx, senderAddr, akava); err != nil {
return err
}
if err := k.akavaKeeper.SendBalance(ctx, senderAddr, recipientAddr, akava); err != nil {
return err
}
return k.ConvertAkavaToUkava(ctx, recipientAddr)
}
// SendCoinsFromAccountToModule transfers akava coins from an AccAddress to a ModuleAccount.
// It will panic if the module account does not exist.
func (k EvmBankKeeper) SendCoinsFromAccountToModule(ctx sdk.Context, senderAddr sdk.AccAddress, recipientModule string, amt sdk.Coins) error {
ukava, akavaNeeded, err := SplitAkavaCoins(amt)
if err != nil {
return err
}
if ukava.IsPositive() {
if err := k.bk.SendCoinsFromAccountToModule(ctx, senderAddr, recipientModule, sdk.NewCoins(ukava)); err != nil {
return err
}
}
if err := k.ConvertOneUkavaToAkavaIfNeeded(ctx, senderAddr, akavaNeeded); err != nil {
return err
}
recipientAddr := k.GetModuleAddress(recipientModule)
if err := k.akavaKeeper.SendBalance(ctx, senderAddr, recipientAddr, akavaNeeded); err != nil {
return err
}
return k.ConvertAkavaToUkava(ctx, recipientAddr)
}
// MintCoins mints akava coins by minting the equivalent ukava coins and any remaining akava coins.
// It will panic if the module account does not exist or is unauthorized.
func (k EvmBankKeeper) MintCoins(ctx sdk.Context, moduleName string, amt sdk.Coins) error {
ukava, akava, err := SplitAkavaCoins(amt)
if err != nil {
return err
}
if ukava.IsPositive() {
if err := k.bk.MintCoins(ctx, moduleName, sdk.NewCoins(ukava)); err != nil {
return err
}
}
recipientAddr := k.GetModuleAddress(moduleName)
if err := k.akavaKeeper.AddBalance(ctx, recipientAddr, akava); err != nil {
return err
}
return k.ConvertAkavaToUkava(ctx, recipientAddr)
}
// BurnCoins burns akava coins by burning the equivalent ukava coins and any remaining akava coins.
// It will panic if the module account does not exist or is unauthorized.
func (k EvmBankKeeper) BurnCoins(ctx sdk.Context, moduleName string, amt sdk.Coins) error {
ukava, akava, err := SplitAkavaCoins(amt)
if err != nil {
return err
}
if ukava.IsPositive() {
if err := k.bk.BurnCoins(ctx, moduleName, sdk.NewCoins(ukava)); err != nil {
return err
}
}
moduleAddr := k.GetModuleAddress(moduleName)
if err := k.ConvertOneUkavaToAkavaIfNeeded(ctx, moduleAddr, akava); err != nil {
return err
}
return k.akavaKeeper.RemoveBalance(ctx, moduleAddr, akava)
}
// IsSendEnabledCoins checks the coins provided and returns an ErrSendDisabled
// if any of the coins are not configured for sending. Returns nil if sending is
// enabled for all provided coins.
func (k EvmBankKeeper) IsSendEnabledCoins(ctx sdk.Context, coins ...sdk.Coin) error {
// IsSendEnabledCoins method is not used by the evm module, but is required by the
// evmtypes.BankKeeper interface. This must be updated if the evm module
// is updated to use IsSendEnabledCoins.
panic("not implemented")
}
// ConvertOneUkavaToAkavaIfNeeded converts 1 ukava to akava for an address if
// its akava balance is smaller than the akavaNeeded amount.
func (k EvmBankKeeper) ConvertOneUkavaToAkavaIfNeeded(ctx sdk.Context, addr sdk.AccAddress, akavaNeeded sdkmath.Int) error {
akavaBal := k.akavaKeeper.GetBalance(ctx, addr)
if akavaBal.GTE(akavaNeeded) {
return nil
}
ukavaToStore := sdk.NewCoins(sdk.NewCoin(CosmosDenom, sdk.OneInt()))
if err := k.bk.SendCoinsFromAccountToModule(ctx, addr, types.ModuleName, ukavaToStore); err != nil {
return err
}
// add 1ukava equivalent of akava to addr
akavaToReceive := ConversionMultiplier
if err := k.akavaKeeper.AddBalance(ctx, addr, akavaToReceive); err != nil {
return err
}
return nil
}
// ConvertAkavaToUkava converts all available akava to ukava for a given AccAddress.
func (k EvmBankKeeper) ConvertAkavaToUkava(ctx sdk.Context, addr sdk.AccAddress) error {
totalAkava := k.akavaKeeper.GetBalance(ctx, addr)
ukava, _, err := SplitAkavaCoins(sdk.NewCoins(sdk.NewCoin(EvmDenom, totalAkava)))
if err != nil {
return err
}
// do nothing if account does not have enough akava for a single ukava
ukavaToReceive := ukava.Amount
if !ukavaToReceive.IsPositive() {
return nil
}
// remove akava used for converting to ukava
akavaToBurn := ukavaToReceive.Mul(ConversionMultiplier)
finalBal := totalAkava.Sub(akavaToBurn)
if err := k.akavaKeeper.SetBalance(ctx, addr, finalBal); err != nil {
return err
}
fromAddr := k.GetModuleAddress(types.ModuleName)
if err := k.bk.SendCoins(ctx, fromAddr, addr, sdk.NewCoins(ukava)); err != nil {
return err
}
return nil
}
func (k EvmBankKeeper) GetModuleAddress(moduleName string) sdk.AccAddress {
addr := k.ak.GetModuleAddress(moduleName)
if addr == nil {
panic(errorsmod.Wrapf(sdkerrors.ErrUnknownAddress, "module account %s does not exist", moduleName))
}
return addr
}
// SplitAkavaCoins splits akava coins to the equivalent ukava coins and any remaining akava balance.
// An error will be returned if the coins are not valid or if the coins are not the akava denom.
func SplitAkavaCoins(coins sdk.Coins) (sdk.Coin, sdkmath.Int, error) {
akava := sdk.ZeroInt()
ukava := sdk.NewCoin(CosmosDenom, sdk.ZeroInt())
if len(coins) == 0 {
return ukava, akava, nil
}
if err := ValidateEvmCoins(coins); err != nil {
return ukava, akava, err
}
// note: we should always have len(coins) == 1 here since coins cannot have dup denoms after we validate.
coin := coins[0]
remainingBalance := coin.Amount.Mod(ConversionMultiplier)
if remainingBalance.IsPositive() {
akava = remainingBalance
}
ukavaAmount := coin.Amount.Quo(ConversionMultiplier)
if ukavaAmount.IsPositive() {
ukava = sdk.NewCoin(CosmosDenom, ukavaAmount)
}
return ukava, akava, nil
}
// ValidateEvmCoins validates the coins from evm is valid and is the EvmDenom (akava).
func ValidateEvmCoins(coins sdk.Coins) error {
if len(coins) == 0 {
return nil
}
// validate that coins are non-negative, sorted, and no dup denoms
if err := coins.Validate(); err != nil {
return errorsmod.Wrap(sdkerrors.ErrInvalidCoins, coins.String())
}
// validate that coin denom is akava
if len(coins) != 1 || coins[0].Denom != EvmDenom {
errMsg := fmt.Sprintf("invalid evm coin denom, only %s is supported", EvmDenom)
return errorsmod.Wrap(sdkerrors.ErrInvalidCoins, errMsg)
}
return nil
}