mirror of
https://github.com/0glabs/0g-chain.git
synced 2024-12-27 16:55:21 +00:00
102 lines
3.8 KiB
Go
102 lines
3.8 KiB
Go
package keeper
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import (
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"fmt"
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sdk "github.com/cosmos/cosmos-sdk/types"
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"github.com/kava-labs/kava/x/cdp/types"
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)
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// SeizeCollateral liquidates the collateral in the input cdp.
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// the following operations are performed:
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// 1. updates the fees for the input cdp,
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// 2. sends collateral for all deposits from the cdp module to the liquidator module account
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// 3. Applies the liquidation penalty and mints the corresponding amount of debt coins in the cdp module
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// 4. moves debt coins from the cdp module to the liquidator module account,
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// 5. decrements the total amount of principal outstanding for that collateral type
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// (this is the equivalent of saying that fees are no longer accumulated by a cdp once it gets liquidated)
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func (k Keeper) SeizeCollateral(ctx sdk.Context, cdp types.CDP) error {
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// Calculate the previous collateral ratio
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oldCollateralToDebtRatio := k.CalculateCollateralToDebtRatio(ctx, cdp.Collateral, cdp.Principal.Add(cdp.AccumulatedFees))
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// Move debt coins from cdp to liquidator account
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deposits := k.GetDeposits(ctx, cdp.ID)
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debt := cdp.Principal.Amount.Add(cdp.AccumulatedFees.Amount)
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modAccountDebt := k.getModAccountDebt(ctx, types.ModuleName)
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if modAccountDebt.LT(debt) {
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debt = modAccountDebt
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}
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debtCoin := sdk.NewCoin(k.GetDebtDenom(ctx), debt)
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err := k.supplyKeeper.SendCoinsFromModuleToModule(ctx, types.ModuleName, types.LiquidatorMacc, sdk.NewCoins(debtCoin))
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if err != nil {
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return err
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}
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// liquidate deposits and send collateral from cdp to liquidator
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for _, dep := range deposits {
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ctx.EventManager().EmitEvent(
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sdk.NewEvent(
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types.EventTypeCdpLiquidation,
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sdk.NewAttribute(sdk.AttributeKeyModule, types.AttributeValueCategory),
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sdk.NewAttribute(types.AttributeKeyCdpID, fmt.Sprintf("%d", cdp.ID)),
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sdk.NewAttribute(types.AttributeKeyDepositor, fmt.Sprintf("%s", dep.Depositor)),
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),
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)
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err := k.supplyKeeper.SendCoinsFromModuleToModule(ctx, types.ModuleName, types.LiquidatorMacc, sdk.NewCoins(dep.Amount))
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if err != nil {
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return err
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}
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k.DeleteDeposit(ctx, dep.CdpID, dep.Depositor)
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}
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err = k.AuctionCollateral(ctx, deposits, debt, cdp.Principal.Denom)
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if err != nil {
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return err
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}
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// Decrement total principal for this collateral type
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coinsToDecrement := cdp.Principal.Add(cdp.AccumulatedFees)
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k.DecrementTotalPrincipal(ctx, cdp.Collateral.Denom, coinsToDecrement)
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// Delete CDP from state
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k.RemoveCdpOwnerIndex(ctx, cdp)
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k.RemoveCdpCollateralRatioIndex(ctx, cdp.Collateral.Denom, cdp.ID, oldCollateralToDebtRatio)
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return k.DeleteCDP(ctx, cdp)
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}
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// LiquidateCdps seizes collateral from all CDPs below the input liquidation ratio
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func (k Keeper) LiquidateCdps(ctx sdk.Context, marketID string, denom string, liquidationRatio sdk.Dec) error {
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price, err := k.pricefeedKeeper.GetCurrentPrice(ctx, marketID)
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if err != nil {
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return err
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}
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priceDivLiqRatio := price.Price.Quo(liquidationRatio)
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if priceDivLiqRatio.IsZero() {
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priceDivLiqRatio = sdk.SmallestDec()
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}
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// price = $0.5
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// liquidation ratio = 1.5
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// normalizedRatio = (1/(0.5/1.5)) = 3
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normalizedRatio := sdk.OneDec().Quo(priceDivLiqRatio)
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cdpsToLiquidate := k.GetAllCdpsByDenomAndRatio(ctx, denom, normalizedRatio)
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for _, c := range cdpsToLiquidate {
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err := k.SeizeCollateral(ctx, c)
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if err != nil {
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return err
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}
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}
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return nil
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}
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// ApplyLiquidationPenalty multiplies the input debt amount by the liquidation penalty and mints the debt coins in the cdp module account
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func (k Keeper) ApplyLiquidationPenalty(ctx sdk.Context, denom string, debt sdk.Int) sdk.Int {
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penalty := k.getLiquidationPenalty(ctx, denom)
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penaltyAmount := sdk.NewDecFromInt(debt).Mul(penalty).RoundInt()
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return penaltyAmount
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}
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func (k Keeper) getModAccountDebt(ctx sdk.Context, accountName string) sdk.Int {
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macc := k.supplyKeeper.GetModuleAccount(ctx, accountName)
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return macc.GetCoins().AmountOf(k.GetDebtDenom(ctx))
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}
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