mirror of
https://github.com/0glabs/0g-chain.git
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fix: simplify collateral auction logic
This commit is contained in:
Kevin Davis
parent
d489bacfac
commit
89b63a3cba
@ -1,8 +1,6 @@
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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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@ -13,100 +11,15 @@ const (
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dump = 100
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)
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type partialDeposit struct {
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Depositor sdk.AccAddress
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Amount sdk.Coin
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DebtShare sdk.Int
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}
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func newPartialDeposit(depositor sdk.AccAddress, amount sdk.Coin, ds sdk.Int) partialDeposit {
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return partialDeposit{
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Depositor: depositor,
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Amount: amount,
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DebtShare: ds,
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}
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}
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type partialDeposits []partialDeposit
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func (pd partialDeposits) SumCollateral() (sum sdk.Int) {
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sum = sdk.ZeroInt()
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for _, d := range pd {
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sum = sum.Add(d.Amount.Amount)
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}
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return
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}
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func (pd partialDeposits) SumDebt() (sum sdk.Int) {
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sum = sdk.ZeroInt()
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for _, d := range pd {
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sum = sum.Add(d.DebtShare)
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}
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return
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}
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// AuctionCollateral creates auctions from the input deposits which attempt to raise the corresponding amount of debt
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func (k Keeper) AuctionCollateral(ctx sdk.Context, deposits types.Deposits, debt sdk.Int, bidDenom string) error {
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auctionSize := k.getAuctionSize(ctx, deposits[0].Amount.Denom)
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partialAuctionDeposits := partialDeposits{}
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totalCollateral := deposits.SumCollateral()
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for totalCollateral.GT(sdk.ZeroInt()) {
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for i, dep := range deposits {
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if dep.Amount.IsZero() {
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continue
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}
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collateralAmount := dep.Amount.Amount
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collateralDenom := dep.Amount.Denom
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// create auctions from individual deposits that are larger than the auction size
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debtChange, collateralChange, err := k.CreateAuctionsFromDeposit(ctx, dep, debt, totalCollateral, auctionSize, bidDenom)
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if err != nil {
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return err
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}
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fmt.Printf("AuctionCollateral:createFromD:loop%d:liquidator:%s\n", i, k.supplyKeeper.GetModuleAccount(ctx, types.LiquidatorMacc))
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debt = debt.Sub(debtChange)
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totalCollateral = totalCollateral.Sub(collateralChange)
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dep.Amount = sdk.NewCoin(collateralDenom, collateralAmount.Sub(collateralChange))
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collateralAmount = collateralAmount.Sub(collateralChange)
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// if there is leftover collateral that is less than a lot
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if !dep.Amount.IsZero() {
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// figure out how much debt this deposit accounts for
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// (depositCollateral / totalCollateral) * totalDebtFromCDP
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debtCoveredByDeposit := collateralAmount.Mul(debt).Quo(totalCollateral) // integer division (ie rounds down)
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// if adding this deposit to the other partial deposits is less than a lot
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if (partialAuctionDeposits.SumCollateral().Add(collateralAmount)).LT(auctionSize) {
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// append the deposit to the partial deposits and zero out the deposit
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pd := newPartialDeposit(dep.Depositor, dep.Amount, debtCoveredByDeposit)
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partialAuctionDeposits = append(partialAuctionDeposits, pd)
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dep.Amount = sdk.NewCoin(collateralDenom, sdk.ZeroInt())
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} else {
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// if the sum of partial deposits now makes a lot
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partialCollateral := sdk.NewCoin(collateralDenom, auctionSize.Sub(partialAuctionDeposits.SumCollateral()))
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partialAmount := partialCollateral.Amount
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partialDebt := partialAmount.Mul(debtCoveredByDeposit).Quo(collateralAmount) // integer division (ie rounds down)
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// create a partial deposit from the deposit
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partialDep := newPartialDeposit(dep.Depositor, partialCollateral, partialDebt)
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// append it to the partial deposits
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partialAuctionDeposits = append(partialAuctionDeposits, partialDep)
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// create an auction from the partial deposits
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debtChange, collateralChange, err := k.CreateAuctionFromPartialDeposits(ctx, partialAuctionDeposits, debt, totalCollateral, auctionSize, bidDenom)
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if err != nil {
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return err
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}
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fmt.Printf("AuctionCollateral:createFromPD:loop%d:liquidator:%s\n", i, k.supplyKeeper.GetModuleAccount(ctx, types.LiquidatorMacc))
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debt = debt.Sub(debtChange)
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totalCollateral = totalCollateral.Sub(collateralChange)
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// reset partial deposits and update the deposit amount
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partialAuctionDeposits = partialDeposits{}
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dep.Amount = sdk.NewCoin(collateralDenom, collateralAmount.Sub(partialAmount))
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}
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}
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deposits[i] = dep
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totalCollateral = deposits.SumCollateral()
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}
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}
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if partialAuctionDeposits.SumCollateral().GT(sdk.ZeroInt()) {
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_, _, err := k.CreateAuctionFromPartialDeposits(ctx, partialAuctionDeposits, debt, totalCollateral, partialAuctionDeposits.SumCollateral(), bidDenom)
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auctionSize := k.getAuctionSize(ctx, deposits[0].Amount.Denom)
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totalCollateral := deposits.SumCollateral()
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for _, deposit := range deposits {
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debtCoveredByDeposit := (sdk.NewDecFromInt(deposit.Amount.Amount).Quo(sdk.NewDecFromInt(totalCollateral))).Mul(sdk.NewDecFromInt(debt)).RoundInt()
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err := k.CreateAuctionsFromDeposit(ctx, deposit.Amount, deposit.Depositor, debtCoveredByDeposit, auctionSize, bidDenom)
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if err != nil {
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return err
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}
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@ -114,54 +27,37 @@ func (k Keeper) AuctionCollateral(ctx sdk.Context, deposits types.Deposits, debt
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return nil
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}
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// CreateAuctionsFromDeposit creates auctions from the input deposit until there is less than auctionSize left on the deposit
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// CreateAuctionsFromDeposit creates auctions from the input deposit
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func (k Keeper) CreateAuctionsFromDeposit(
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ctx sdk.Context, dep types.Deposit, debt sdk.Int, totalCollateral sdk.Int, auctionSize sdk.Int,
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principalDenom string) (debtChange sdk.Int, collateralChange sdk.Int, err error) {
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debtChange = sdk.ZeroInt()
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collateralChange = sdk.ZeroInt()
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depositAmount := dep.Amount.Amount
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depositDenom := dep.Amount.Denom
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for depositAmount.GTE(auctionSize) {
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// figure out how much debt is covered by one lots worth of collateral
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depositDebtAmount := (sdk.NewDecFromInt(auctionSize).Quo(sdk.NewDecFromInt(totalCollateral))).Mul(sdk.NewDecFromInt(debt)).RoundInt()
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penalty := k.ApplyLiquidationPenalty(ctx, depositDenom, depositDebtAmount)
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// start an auction for one lot, attempting to raise depositDebtAmount plus the liquidation penalty
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ctx sdk.Context, collateral sdk.Coin, returnAddr sdk.AccAddress, debt, auctionSize sdk.Int,
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principalDenom string) (err error) {
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amountToAuction := sdk.NewInt(collateral.Amount.Int64())
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totalCollateralAmount := sdk.NewInt(collateral.Amount.Int64())
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remainingDebt := sdk.NewInt(debt.Int64())
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for amountToAuction.GT(sdk.ZeroInt()) {
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for amountToAuction.GT(auctionSize) {
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debtCoveredByAuction := (sdk.NewDecFromInt(auctionSize).Quo(sdk.NewDecFromInt(totalCollateralAmount))).Mul(sdk.NewDecFromInt(debt)).RoundInt()
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penalty := k.ApplyLiquidationPenalty(ctx, collateral.Denom, debtCoveredByAuction)
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_, err := k.auctionKeeper.StartCollateralAuction(
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ctx, types.LiquidatorMacc, sdk.NewCoin(depositDenom, auctionSize), sdk.NewCoin(principalDenom, depositDebtAmount.Add(penalty)), []sdk.AccAddress{dep.Depositor},
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[]sdk.Int{auctionSize}, sdk.NewCoin(k.GetDebtDenom(ctx), depositDebtAmount))
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ctx, types.LiquidatorMacc, sdk.NewCoin(collateral.Denom, auctionSize), sdk.NewCoin(principalDenom, debtCoveredByAuction.Add(penalty)), []sdk.AccAddress{returnAddr},
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[]sdk.Int{auctionSize}, sdk.NewCoin(k.GetDebtDenom(ctx), debtCoveredByAuction))
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if err != nil {
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return sdk.ZeroInt(), sdk.ZeroInt(), err
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return err
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}
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depositAmount = depositAmount.Sub(auctionSize)
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totalCollateral = totalCollateral.Sub(auctionSize)
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debt = debt.Sub(depositDebtAmount)
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// subtract one lot's worth of debt from the total debt covered by this deposit
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debtChange = debtChange.Add(depositDebtAmount)
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collateralChange = collateralChange.Add(auctionSize)
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amountToAuction = amountToAuction.Sub(auctionSize)
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remainingDebt = remainingDebt.Sub(debtCoveredByAuction)
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}
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return debtChange, collateralChange, nil
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}
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// CreateAuctionFromPartialDeposits creates an auction from the input partial deposits
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func (k Keeper) CreateAuctionFromPartialDeposits(ctx sdk.Context, partialDeps partialDeposits, debt sdk.Int, collateral sdk.Int, auctionSize sdk.Int, bidDenom string) (debtChange, collateralChange sdk.Int, err error) {
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returnAddrs := []sdk.AccAddress{}
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returnWeights := []sdk.Int{}
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depositDenom := partialDeps[0].Amount.Denom
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for _, pd := range partialDeps {
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returnAddrs = append(returnAddrs, pd.Depositor)
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returnWeights = append(returnWeights, pd.DebtShare)
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}
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penalty := k.ApplyLiquidationPenalty(ctx, depositDenom, partialDeps.SumDebt())
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_, err = k.auctionKeeper.StartCollateralAuction(ctx, types.LiquidatorMacc, sdk.NewCoin(partialDeps[0].Amount.Denom, auctionSize), sdk.NewCoin(bidDenom, partialDeps.SumDebt().Add(penalty)), returnAddrs, returnWeights, sdk.NewCoin(k.GetDebtDenom(ctx), partialDeps.SumDebt()))
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penalty := k.ApplyLiquidationPenalty(ctx, collateral.Denom, remainingDebt)
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_, err := k.auctionKeeper.StartCollateralAuction(
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ctx, types.LiquidatorMacc, sdk.NewCoin(collateral.Denom, amountToAuction), sdk.NewCoin(principalDenom, remainingDebt.Add(penalty)), []sdk.AccAddress{returnAddr},
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[]sdk.Int{amountToAuction}, sdk.NewCoin(k.GetDebtDenom(ctx), remainingDebt))
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if err != nil {
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return sdk.ZeroInt(), sdk.ZeroInt(), err
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return err
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}
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debtChange = partialDeps.SumDebt()
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collateralChange = partialDeps.SumCollateral()
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return debtChange, collateralChange, nil
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amountToAuction = sdk.ZeroInt()
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}
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return nil
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}
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// NetSurplusAndDebt burns surplus and debt coins equal to the minimum of surplus and debt balances held by the liquidator module account
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@ -32,7 +32,6 @@ func (k Keeper) SeizeCollateral(ctx sdk.Context, cdp types.CDP) error {
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if err != nil {
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return err
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}
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fmt.Printf("SeizeCollateral:liquidator: %s\n", k.supplyKeeper.GetModuleAccount(ctx, types.LiquidatorMacc))
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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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@ -50,7 +49,6 @@ func (k Keeper) SeizeCollateral(ctx sdk.Context, cdp types.CDP) error {
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}
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k.DeleteDeposit(ctx, dep.CdpID, dep.Depositor)
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}
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fmt.Printf("SeizeCollateral:liquidator: %s\n", k.supplyKeeper.GetModuleAccount(ctx, types.LiquidatorMacc))
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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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@ -2,7 +2,6 @@ package keeper_test
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import (
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"errors"
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"fmt"
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"math/rand"
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"testing"
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"time"
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@ -167,10 +166,6 @@ func (suite *SeizeTestSuite) TestSeizeCollateralMultiDeposit() {
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p := cdp.Principal.Amount
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cl := cdp.Collateral.Amount
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tpb := suite.keeper.GetTotalPrincipal(suite.ctx, "xrp", "usdx")
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fmt.Printf("%s\n", cdp)
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fmt.Printf("%s\n", deposits)
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fmt.Printf("cdpaccount: %s\n", suite.app.GetSupplyKeeper().GetModuleAccount(suite.ctx, types.ModuleName))
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fmt.Printf("liquidator: %s\n", suite.app.GetSupplyKeeper().GetModuleAccount(suite.ctx, types.LiquidatorMacc))
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err = suite.keeper.SeizeCollateral(suite.ctx, cdp)
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suite.NoError(err)
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tpa := suite.keeper.GetTotalPrincipal(suite.ctx, "xrp", "usdx")
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