mirror of
https://github.com/0glabs/0g-chain.git
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330 lines
12 KiB
Go
330 lines
12 KiB
Go
package keeper
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import (
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"errors"
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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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"github.com/kava-labs/kava/x/precisebank/types"
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)
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// IsSendEnabledCoins uses the parent x/bank keeper to check the coins provided
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// and returns an ErrSendDisabled if any of the coins are not configured for
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// sending. Returns nil if sending is enabled for all provided coin
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func (k Keeper) IsSendEnabledCoins(ctx sdk.Context, coins ...sdk.Coin) error {
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// TODO: This does not actually seem to be used by x/evm, so it should be
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// removed from the expected_interface in x/evm.
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return k.bk.IsSendEnabledCoins(ctx, coins...)
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}
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// SendCoins transfers amt coins from a sending account to a receiving account.
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// An error is returned upon failure. This handles transfers including
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// ExtendedCoinDenom and supports non-ExtendedCoinDenom transfers by passing
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// through to x/bank.
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func (k Keeper) SendCoins(
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ctx sdk.Context,
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from, to sdk.AccAddress,
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amt sdk.Coins,
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) error {
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// IsSendEnabledCoins() is only used in x/bank in msg server, not in keeper,
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// so we should also not use it here to align with x/bank behavior.
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if !amt.IsValid() {
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return errorsmod.Wrap(sdkerrors.ErrInvalidCoins, amt.String())
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}
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passthroughCoins := amt
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extendedCoinAmount := amt.AmountOf(types.ExtendedCoinDenom)
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// Remove the extended coin amount from the passthrough coins
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if extendedCoinAmount.IsPositive() {
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subCoin := sdk.NewCoin(types.ExtendedCoinDenom, extendedCoinAmount)
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passthroughCoins = amt.Sub(subCoin)
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}
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// Send the passthrough coins through x/bank
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if passthroughCoins.IsAllPositive() {
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if err := k.bk.SendCoins(ctx, from, to, passthroughCoins); err != nil {
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return err
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}
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}
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// If there is no extended coin amount, we are done
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if extendedCoinAmount.IsZero() {
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return nil
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}
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// Send the extended coin amount through x/precisebank
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return k.sendExtendedCoins(ctx, from, to, extendedCoinAmount)
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}
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// sendExtendedCoins transfers amt extended coins from a sending account to a
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// receiving account. An error is returned upon failure. This function is
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// called by SendCoins() and should not be called directly.
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//
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// This method covers 4 cases between two accounts - sender and receiver.
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// Depending on the fractional balance and the amount being transferred:
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// Sender account:
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// 1. Arithmetic borrow 1 integer equivalent amount of fractional coins if the
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// fractional balance is insufficient.
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// 2. No borrow if fractional balance is sufficient.
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//
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// Receiver account:
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// 1. Arithmetic carry 1 integer equivalent amount of fractional coins if the
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// received amount exceeds max fractional balance.
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// 2. No carry if received amount does not exceed max fractional balance.
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//
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// The 4 cases are:
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// 1. Sender borrow, receiver carry
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// 2. Sender borrow, NO receiver carry
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// 3. NO sender borrow, receiver carry
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// 4. NO sender borrow, NO receiver carry
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//
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// Truth table:
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// | Sender Borrow | Receiver Carry | Direct Transfer |
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// | --------------|----------------|-----------------|
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// | T | T | T |
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// | T | F | F |
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// | F | T | F |
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// | F | F | F |
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func (k Keeper) sendExtendedCoins(
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ctx sdk.Context,
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from, to sdk.AccAddress,
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amt sdkmath.Int,
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) error {
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// Sufficient balance check is done by bankkeeper.SendCoins(), for both
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// integer and fractional-only sends. E.g. If fractional balance is
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// insufficient, it will still incur a integer borrow which will fail if the
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// sender does not have sufficient integer balance.
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// Load required state: Account old balances
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senderFracBal := k.GetFractionalBalance(ctx, from)
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recipientFracBal := k.GetFractionalBalance(ctx, to)
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// -------------------------------------------------------------------------
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// Pure stateless calculations
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integerAmt := amt.Quo(types.ConversionFactor())
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fractionalAmt := amt.Mod(types.ConversionFactor())
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// Account new fractional balances
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senderNewFracBal, senderNeedsBorrow := subFromFractionalBalance(senderFracBal, fractionalAmt)
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recipientNewFracBal, recipientNeedsCarry := addToFractionalBalance(recipientFracBal, fractionalAmt)
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// Case #1: Sender borrow, recipient carry
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if senderNeedsBorrow && recipientNeedsCarry {
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// Can directly transfer borrow/carry - increase the direct transfer by 1
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integerAmt = integerAmt.AddRaw(1)
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}
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// -------------------------------------------------------------------------
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// Stateful operations for transfers
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// This includes ALL transfers of >= conversionFactor AND Case #1
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// Full integer amount transfer, including direct transfer of borrow/carry
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// if any.
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if integerAmt.IsPositive() {
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transferCoin := sdk.NewCoin(types.IntegerCoinDenom, integerAmt)
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if err := k.bk.SendCoins(ctx, from, to, sdk.NewCoins(transferCoin)); err != nil {
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return k.updateInsufficientFundsError(ctx, from, amt, err)
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}
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}
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// Case #2: Sender borrow, NO recipient carry
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// Sender borrows by transferring 1 integer amount to reserve to account for
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// lack of fractional balance.
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if senderNeedsBorrow && !recipientNeedsCarry {
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borrowCoin := sdk.NewCoin(types.IntegerCoinDenom, sdk.NewInt(1))
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if err := k.bk.SendCoinsFromAccountToModule(
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ctx,
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from, // sender borrowing
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types.ModuleName,
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sdk.NewCoins(borrowCoin),
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); err != nil {
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return k.updateInsufficientFundsError(ctx, from, amt, err)
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}
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}
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// Case #3: NO sender borrow, recipient carry.
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// Recipient's fractional balance carries over to integer balance by 1.
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// Always send carry from reserve before receiving borrow from sender to
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// ensure reserve always has sufficient balance starting from 0.
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if !senderNeedsBorrow && recipientNeedsCarry {
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carryCoin := sdk.NewCoin(types.IntegerCoinDenom, sdk.NewInt(1))
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if err := k.bk.SendCoinsFromModuleToAccount(
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ctx,
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types.ModuleName,
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to, // recipient carrying
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sdk.NewCoins(carryCoin),
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); err != nil {
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// Panic instead of returning error, as this will only error
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// with invalid state or logic. Reserve should always have
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// sufficient balance to carry fractional coins.
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panic(fmt.Errorf("failed to carry fractional coins to %s: %w", to, err))
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}
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}
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// Case #4: NO sender borrow, NO recipient carry
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// No additional operations required, as the transfer of fractional coins
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// does not incur any integer borrow or carry. New fractional balances
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// already calculated and just need to be set.
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// Persist new fractional balances to store.
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k.SetFractionalBalance(ctx, from, senderNewFracBal)
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k.SetFractionalBalance(ctx, to, recipientNewFracBal)
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return nil
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}
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// subFromFractionalBalance subtracts a fractional amount from the provided
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// current fractional balance, returning the new fractional balance and true if
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// an integer borrow is required.
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func subFromFractionalBalance(
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currentFractionalBalance sdkmath.Int,
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amountToSub sdkmath.Int,
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) (sdkmath.Int, bool) {
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// Enforce that currentFractionalBalance is not a full balance.
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if currentFractionalBalance.GTE(types.ConversionFactor()) {
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panic("currentFractionalBalance must be less than ConversionFactor")
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}
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if amountToSub.GTE(types.ConversionFactor()) {
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panic("amountToSub must be less than ConversionFactor")
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}
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newFractionalBalance := currentFractionalBalance.Sub(amountToSub)
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// Insufficient fractional balance, so we need to borrow.
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borrowRequired := newFractionalBalance.IsNegative()
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if borrowRequired {
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// Borrowing 1 integer equivalent amount of fractional coins. We need to
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// add 1 integer equivalent amount to the fractional balance otherwise
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// the new fractional balance will be negative.
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newFractionalBalance = newFractionalBalance.Add(types.ConversionFactor())
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}
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return newFractionalBalance, borrowRequired
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}
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// addToFractionalBalance adds a fractional amount to the provided current
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// fractional balance, returning the new fractional balance and true if a carry
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// is required.
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func addToFractionalBalance(
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currentFractionalBalance sdkmath.Int,
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amountToAdd sdkmath.Int,
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) (sdkmath.Int, bool) {
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// Enforce that currentFractionalBalance is not a full balance.
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if currentFractionalBalance.GTE(types.ConversionFactor()) {
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panic("currentFractionalBalance must be less than ConversionFactor")
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}
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if amountToAdd.GTE(types.ConversionFactor()) {
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panic("amountToAdd must be less than ConversionFactor")
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}
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newFractionalBalance := currentFractionalBalance.Add(amountToAdd)
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// New balance exceeds max fractional balance, so we need to carry it over
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// to the integer balance.
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carryRequired := newFractionalBalance.GTE(types.ConversionFactor())
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if carryRequired {
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// Carry over to integer amount
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newFractionalBalance = newFractionalBalance.Sub(types.ConversionFactor())
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}
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return newFractionalBalance, carryRequired
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}
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// SendCoinsFromModuleToModule transfers coins from a ModuleAccount to another.
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// It will panic if either module account does not exist. An error is returned
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// if the recipient module is the x/precisebank module account or if sending the
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// tokens fails.
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func (k Keeper) SendCoinsFromAccountToModule(
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ctx sdk.Context,
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senderAddr sdk.AccAddress,
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recipientModule string,
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amt sdk.Coins,
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) error {
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recipientAcc := k.ak.GetModuleAccount(ctx, recipientModule)
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if recipientAcc == nil {
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panic(errorsmod.Wrapf(sdkerrors.ErrUnknownAddress, "module account %s does not exist", recipientModule))
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}
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if recipientModule == types.ModuleName {
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return errorsmod.Wrapf(sdkerrors.ErrUnauthorized, "module account %s is not allowed to receive funds", types.ModuleName)
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}
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return k.SendCoins(ctx, senderAddr, recipientAcc.GetAddress(), amt)
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}
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// SendCoinsFromModuleToAccount transfers 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
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// the recipient address is blocked, if the sender is the x/precisebank module
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// account, or if sending the tokens fails.
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func (k Keeper) SendCoinsFromModuleToAccount(
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ctx sdk.Context,
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senderModule string,
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recipientAddr sdk.AccAddress,
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amt sdk.Coins,
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) error {
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// Identical panics to x/bank
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senderAddr := k.ak.GetModuleAddress(senderModule)
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if senderAddr == nil {
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panic(errorsmod.Wrapf(sdkerrors.ErrUnknownAddress, "module account %s does not exist", senderModule))
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}
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// Custom error to prevent external modules from modifying x/precisebank
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// balances. x/precisebank module account balance is for internal reserve
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// use only.
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if senderModule == types.ModuleName {
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return errorsmod.Wrapf(sdkerrors.ErrUnauthorized, "module account %s is not allowed to send funds", types.ModuleName)
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}
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// Uses x/bank BlockedAddr, no need to modify. x/precisebank should be
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// blocked.
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if k.bk.BlockedAddr(recipientAddr) {
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return errorsmod.Wrapf(sdkerrors.ErrUnauthorized, "%s is not allowed to receive funds", recipientAddr)
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}
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return k.SendCoins(ctx, senderAddr, recipientAddr, amt)
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}
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// updateInsufficientFundsError returns a modified ErrInsufficientFunds with
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// extended coin amounts if the error is due to insufficient funds. Otherwise,
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// it returns the original error. This is used since x/bank transfers will
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// return errors with integer coins, but we want the more accurate error that
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// contains the full extended coin balance and send amounts.
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func (k Keeper) updateInsufficientFundsError(
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ctx sdk.Context,
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addr sdk.AccAddress,
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amt sdkmath.Int,
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err error,
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) error {
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if !errors.Is(err, sdkerrors.ErrInsufficientFunds) {
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return err
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}
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// Check balance is sufficient
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bal := k.GetBalance(ctx, addr, types.ExtendedCoinDenom)
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coin := sdk.NewCoin(types.ExtendedCoinDenom, amt)
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// TODO: This checks spendable coins and returns error with spendable
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// coins, not full balance. If GetBalance() is modified to return the
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// full, including locked, balance then this should be updated to deduct
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// locked coins.
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// Use sdk.NewCoins() so that it removes empty balances - ie. prints
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// empty string if balance is 0. This is to match x/bank behavior.
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spendable := sdk.NewCoins(bal)
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return errorsmod.Wrapf(
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sdkerrors.ErrInsufficientFunds,
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"spendable balance %s is smaller than %s",
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spendable, coin,
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)
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}
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