mirror of
https://github.com/0glabs/0g-chain.git
synced 2024-12-26 00:05:18 +00:00
102 lines
3.8 KiB
Go
102 lines
3.8 KiB
Go
package keeper
|
|
|
|
import (
|
|
"fmt"
|
|
|
|
sdk "github.com/cosmos/cosmos-sdk/types"
|
|
|
|
"github.com/kava-labs/kava/x/cdp/types"
|
|
)
|
|
|
|
// SeizeCollateral liquidates the collateral in the input cdp.
|
|
// the following operations are performed:
|
|
// 1. updates the fees for the input cdp,
|
|
// 2. sends collateral for all deposits from the cdp module to the liquidator module account
|
|
// 3. Applies the liquidation penalty and mints the corresponding amount of debt coins in the cdp module
|
|
// 3. moves debt coins from the cdp module to the liquidator module account,
|
|
// 4. decrements the total amount of principal outstanding for that collateral type
|
|
// (this is the equivalent of saying that fees are no longer accumulated by a cdp once it gets liquidated)
|
|
func (k Keeper) SeizeCollateral(ctx sdk.Context, cdp types.CDP) error {
|
|
// Calculate the previous collateral ratio
|
|
oldCollateralToDebtRatio := k.CalculateCollateralToDebtRatio(ctx, cdp.Collateral, cdp.Principal.Add(cdp.AccumulatedFees))
|
|
|
|
// Move debt coins from cdp to liquidator account
|
|
deposits := k.GetDeposits(ctx, cdp.ID)
|
|
debt := cdp.Principal.Amount.Add(cdp.AccumulatedFees.Amount)
|
|
modAccountDebt := k.getModAccountDebt(ctx, types.ModuleName)
|
|
if modAccountDebt.LT(debt) {
|
|
debt = modAccountDebt
|
|
}
|
|
debtCoin := sdk.NewCoin(k.GetDebtDenom(ctx), debt)
|
|
err := k.supplyKeeper.SendCoinsFromModuleToModule(ctx, types.ModuleName, types.LiquidatorMacc, sdk.NewCoins(debtCoin))
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
// liquidate deposits and send collateral from cdp to liquidator
|
|
for _, dep := range deposits {
|
|
ctx.EventManager().EmitEvent(
|
|
sdk.NewEvent(
|
|
types.EventTypeCdpLiquidation,
|
|
sdk.NewAttribute(sdk.AttributeKeyModule, types.AttributeValueCategory),
|
|
sdk.NewAttribute(types.AttributeKeyCdpID, fmt.Sprintf("%d", cdp.ID)),
|
|
sdk.NewAttribute(types.AttributeKeyDeposit, dep.String()),
|
|
),
|
|
)
|
|
err := k.supplyKeeper.SendCoinsFromModuleToModule(ctx, types.ModuleName, types.LiquidatorMacc, sdk.NewCoins(dep.Amount))
|
|
if err != nil {
|
|
return err
|
|
}
|
|
k.DeleteDeposit(ctx, dep.CdpID, dep.Depositor)
|
|
}
|
|
err = k.AuctionCollateral(ctx, deposits, debt, cdp.Principal.Denom)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
// Decrement total principal for this collateral type
|
|
coinsToDecrement := cdp.Principal.Add(cdp.AccumulatedFees)
|
|
k.DecrementTotalPrincipal(ctx, cdp.Collateral.Denom, coinsToDecrement)
|
|
|
|
// Delete CDP from state
|
|
k.RemoveCdpOwnerIndex(ctx, cdp)
|
|
k.RemoveCdpCollateralRatioIndex(ctx, cdp.Collateral.Denom, cdp.ID, oldCollateralToDebtRatio)
|
|
return k.DeleteCDP(ctx, cdp)
|
|
}
|
|
|
|
// LiquidateCdps seizes collateral from all CDPs below the input liquidation ratio
|
|
func (k Keeper) LiquidateCdps(ctx sdk.Context, marketID string, denom string, liquidationRatio sdk.Dec) error {
|
|
price, err := k.pricefeedKeeper.GetCurrentPrice(ctx, marketID)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
priceDivLiqRatio := price.Price.Quo(liquidationRatio)
|
|
if priceDivLiqRatio.IsZero() {
|
|
priceDivLiqRatio = sdk.SmallestDec()
|
|
}
|
|
// price = $0.5
|
|
// liquidation ratio = 1.5
|
|
// normalizedRatio = (1/(0.5/1.5)) = 3
|
|
normalizedRatio := sdk.OneDec().Quo(priceDivLiqRatio)
|
|
cdpsToLiquidate := k.GetAllCdpsByDenomAndRatio(ctx, denom, normalizedRatio)
|
|
for _, c := range cdpsToLiquidate {
|
|
err := k.SeizeCollateral(ctx, c)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// ApplyLiquidationPenalty multiplies the input debt amount by the liquidation penalty and mints the debt coins in the cdp module account
|
|
func (k Keeper) ApplyLiquidationPenalty(ctx sdk.Context, denom string, debt sdk.Int) sdk.Int {
|
|
penalty := k.getLiquidationPenalty(ctx, denom)
|
|
penaltyAmount := sdk.NewDecFromInt(debt).Mul(penalty).RoundInt()
|
|
return penaltyAmount
|
|
}
|
|
|
|
func (k Keeper) getModAccountDebt(ctx sdk.Context, accountName string) sdk.Int {
|
|
macc := k.supplyKeeper.GetModuleAccount(ctx, accountName)
|
|
return macc.GetCoins().AmountOf(k.GetDebtDenom(ctx))
|
|
}
|