mirror of
https://github.com/0glabs/0g-chain.git
synced 2024-11-10 18:15:19 +00:00
282 lines
9.1 KiB
Go
282 lines
9.1 KiB
Go
package keeper
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import (
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"fmt"
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errorsmod "cosmossdk.io/errors"
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sdkmath "cosmossdk.io/math"
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sdk "github.com/cosmos/cosmos-sdk/types"
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sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
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evmtypes "github.com/evmos/ethermint/x/evm/types"
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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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// EvmDenom is the gas denom used by the evm
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EvmDenom = "akava"
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// CosmosDenom is the gas denom used by the kava app
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CosmosDenom = "ukava"
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)
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// ConversionMultiplier is the conversion multiplier between akava and ukava
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var ConversionMultiplier = sdkmath.NewInt(1_000_000_000_000)
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var _ evmtypes.BankKeeper = EvmBankKeeper{}
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// EvmBankKeeper is a BankKeeper wrapper for the x/evm module to allow the use
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// of the 18 decimal akava coin on the evm.
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// x/evm consumes gas and send coins by minting and burning akava coins in its module
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// account and then sending the funds to the target account.
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// This keeper uses both the ukava coin and a separate akava balance to manage the
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// extra percision needed by the evm.
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type EvmBankKeeper struct {
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akavaKeeper Keeper
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bk types.BankKeeper
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ak types.AccountKeeper
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}
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func NewEvmBankKeeper(akavaKeeper Keeper, bk types.BankKeeper, ak types.AccountKeeper) EvmBankKeeper {
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return EvmBankKeeper{
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akavaKeeper: akavaKeeper,
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bk: bk,
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ak: ak,
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}
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}
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// GetBalance returns the total **spendable** balance of akava for a given account by address.
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func (k EvmBankKeeper) GetBalance(ctx sdk.Context, addr sdk.AccAddress, denom string) sdk.Coin {
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if denom != EvmDenom {
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panic(fmt.Errorf("only evm denom %s is supported by EvmBankKeeper", EvmDenom))
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}
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spendableCoins := k.bk.SpendableCoins(ctx, addr)
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ukava := spendableCoins.AmountOf(CosmosDenom)
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akava := k.akavaKeeper.GetBalance(ctx, addr)
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total := ukava.Mul(ConversionMultiplier).Add(akava)
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return sdk.NewCoin(EvmDenom, total)
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}
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// SendCoins transfers akava coins from a AccAddress to an AccAddress.
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func (k EvmBankKeeper) SendCoins(ctx sdk.Context, senderAddr sdk.AccAddress, recipientAddr sdk.AccAddress, amt sdk.Coins) error {
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// SendCoins method is not used by the evm module, but is required by the
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// evmtypes.BankKeeper interface. This must be updated if the evm module
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// is updated to use SendCoins.
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panic("not implemented")
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}
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// SendCoinsFromModuleToAccount transfers akava coins from a ModuleAccount to an AccAddress.
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// It will panic if the module account does not exist. An error is returned if the recipient
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// address is black-listed or if sending the tokens fails.
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func (k EvmBankKeeper) SendCoinsFromModuleToAccount(ctx sdk.Context, senderModule string, recipientAddr sdk.AccAddress, amt sdk.Coins) error {
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ukava, akava, err := SplitAkavaCoins(amt)
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if err != nil {
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return err
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}
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if ukava.Amount.IsPositive() {
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if err := k.bk.SendCoinsFromModuleToAccount(ctx, senderModule, recipientAddr, sdk.NewCoins(ukava)); err != nil {
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return err
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}
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}
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senderAddr := k.GetModuleAddress(senderModule)
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if err := k.ConvertOneUkavaToAkavaIfNeeded(ctx, senderAddr, akava); err != nil {
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return err
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}
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if err := k.akavaKeeper.SendBalance(ctx, senderAddr, recipientAddr, akava); err != nil {
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return err
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}
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return k.ConvertAkavaToUkava(ctx, recipientAddr)
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}
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// SendCoinsFromAccountToModule transfers akava coins from an AccAddress to a ModuleAccount.
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// It will panic if the module account does not exist.
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func (k EvmBankKeeper) SendCoinsFromAccountToModule(ctx sdk.Context, senderAddr sdk.AccAddress, recipientModule string, amt sdk.Coins) error {
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ukava, akavaNeeded, err := SplitAkavaCoins(amt)
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if err != nil {
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return err
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}
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if ukava.IsPositive() {
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if err := k.bk.SendCoinsFromAccountToModule(ctx, senderAddr, recipientModule, sdk.NewCoins(ukava)); err != nil {
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return err
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}
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}
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if err := k.ConvertOneUkavaToAkavaIfNeeded(ctx, senderAddr, akavaNeeded); err != nil {
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return err
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}
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recipientAddr := k.GetModuleAddress(recipientModule)
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if err := k.akavaKeeper.SendBalance(ctx, senderAddr, recipientAddr, akavaNeeded); err != nil {
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return err
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}
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return k.ConvertAkavaToUkava(ctx, recipientAddr)
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}
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// MintCoins mints akava coins by minting the equivalent ukava coins and any remaining akava coins.
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// It will panic if the module account does not exist or is unauthorized.
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func (k EvmBankKeeper) MintCoins(ctx sdk.Context, moduleName string, amt sdk.Coins) error {
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ukava, akava, err := SplitAkavaCoins(amt)
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if err != nil {
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return err
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}
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if ukava.IsPositive() {
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if err := k.bk.MintCoins(ctx, moduleName, sdk.NewCoins(ukava)); err != nil {
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return err
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}
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}
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recipientAddr := k.GetModuleAddress(moduleName)
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if err := k.akavaKeeper.AddBalance(ctx, recipientAddr, akava); err != nil {
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return err
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}
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return k.ConvertAkavaToUkava(ctx, recipientAddr)
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}
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// BurnCoins burns akava coins by burning the equivalent ukava coins and any remaining akava coins.
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// It will panic if the module account does not exist or is unauthorized.
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func (k EvmBankKeeper) BurnCoins(ctx sdk.Context, moduleName string, amt sdk.Coins) error {
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ukava, akava, err := SplitAkavaCoins(amt)
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if err != nil {
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return err
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}
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if ukava.IsPositive() {
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if err := k.bk.BurnCoins(ctx, moduleName, sdk.NewCoins(ukava)); err != nil {
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return err
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}
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}
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moduleAddr := k.GetModuleAddress(moduleName)
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if err := k.ConvertOneUkavaToAkavaIfNeeded(ctx, moduleAddr, akava); err != nil {
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return err
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}
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return k.akavaKeeper.RemoveBalance(ctx, moduleAddr, akava)
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}
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// IsSendEnabledCoins checks the coins provided and returns an ErrSendDisabled
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// if any of the coins are not configured for sending. Returns nil if sending is
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// enabled for all provided coins.
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func (k EvmBankKeeper) IsSendEnabledCoins(ctx sdk.Context, coins ...sdk.Coin) error {
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// IsSendEnabledCoins method is not used by the evm module, but is required by the
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// evmtypes.BankKeeper interface. This must be updated if the evm module
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// is updated to use IsSendEnabledCoins.
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panic("not implemented")
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}
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// ConvertOneUkavaToAkavaIfNeeded converts 1 ukava to akava for an address if
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// its akava balance is smaller than the akavaNeeded amount.
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func (k EvmBankKeeper) ConvertOneUkavaToAkavaIfNeeded(ctx sdk.Context, addr sdk.AccAddress, akavaNeeded sdkmath.Int) error {
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akavaBal := k.akavaKeeper.GetBalance(ctx, addr)
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if akavaBal.GTE(akavaNeeded) {
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return nil
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}
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ukavaToStore := sdk.NewCoins(sdk.NewCoin(CosmosDenom, sdk.OneInt()))
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if err := k.bk.SendCoinsFromAccountToModule(ctx, addr, types.ModuleName, ukavaToStore); err != nil {
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return err
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}
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// add 1ukava equivalent of akava to addr
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akavaToReceive := ConversionMultiplier
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if err := k.akavaKeeper.AddBalance(ctx, addr, akavaToReceive); err != nil {
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return err
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}
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return nil
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}
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// ConvertAkavaToUkava converts all available akava to ukava for a given AccAddress.
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func (k EvmBankKeeper) ConvertAkavaToUkava(ctx sdk.Context, addr sdk.AccAddress) error {
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totalAkava := k.akavaKeeper.GetBalance(ctx, addr)
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ukava, _, err := SplitAkavaCoins(sdk.NewCoins(sdk.NewCoin(EvmDenom, totalAkava)))
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if err != nil {
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return err
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}
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// do nothing if account does not have enough akava for a single ukava
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ukavaToReceive := ukava.Amount
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if !ukavaToReceive.IsPositive() {
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return nil
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}
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// remove akava used for converting to ukava
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akavaToBurn := ukavaToReceive.Mul(ConversionMultiplier)
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finalBal := totalAkava.Sub(akavaToBurn)
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if err := k.akavaKeeper.SetBalance(ctx, addr, finalBal); err != nil {
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return err
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}
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fromAddr := k.GetModuleAddress(types.ModuleName)
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if err := k.bk.SendCoins(ctx, fromAddr, addr, sdk.NewCoins(ukava)); err != nil {
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return err
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}
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return nil
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}
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func (k EvmBankKeeper) GetModuleAddress(moduleName string) sdk.AccAddress {
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addr := k.ak.GetModuleAddress(moduleName)
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if addr == nil {
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panic(errorsmod.Wrapf(sdkerrors.ErrUnknownAddress, "module account %s does not exist", moduleName))
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}
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return addr
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}
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// SplitAkavaCoins splits akava coins to the equivalent ukava coins and any remaining akava balance.
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// An error will be returned if the coins are not valid or if the coins are not the akava denom.
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func SplitAkavaCoins(coins sdk.Coins) (sdk.Coin, sdkmath.Int, error) {
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akava := sdk.ZeroInt()
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ukava := sdk.NewCoin(CosmosDenom, sdk.ZeroInt())
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if len(coins) == 0 {
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return ukava, akava, nil
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}
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if err := ValidateEvmCoins(coins); err != nil {
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return ukava, akava, err
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}
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// note: we should always have len(coins) == 1 here since coins cannot have dup denoms after we validate.
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coin := coins[0]
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remainingBalance := coin.Amount.Mod(ConversionMultiplier)
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if remainingBalance.IsPositive() {
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akava = remainingBalance
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}
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ukavaAmount := coin.Amount.Quo(ConversionMultiplier)
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if ukavaAmount.IsPositive() {
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ukava = sdk.NewCoin(CosmosDenom, ukavaAmount)
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}
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return ukava, akava, nil
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}
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// ValidateEvmCoins validates the coins from evm is valid and is the EvmDenom (akava).
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func ValidateEvmCoins(coins sdk.Coins) error {
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if len(coins) == 0 {
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return nil
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}
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// validate that coins are non-negative, sorted, and no dup denoms
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if err := coins.Validate(); err != nil {
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return errorsmod.Wrap(sdkerrors.ErrInvalidCoins, coins.String())
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}
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// validate that coin denom is akava
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if len(coins) != 1 || coins[0].Denom != EvmDenom {
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errMsg := fmt.Sprintf("invalid evm coin denom, only %s is supported", EvmDenom)
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return errorsmod.Wrap(sdkerrors.ErrInvalidCoins, errMsg)
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}
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return nil
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}
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