0g-chain/x/cdp/keeper/deposit.go
Kevin Davis ade6edb918
[R4R] Add liquidation pricefeed (#524)
* add parameter for liquidation pricefeed
2020-05-24 09:42:46 -04:00

165 lines
5.9 KiB
Go

package keeper
import (
"fmt"
"github.com/cosmos/cosmos-sdk/store/prefix"
sdk "github.com/cosmos/cosmos-sdk/types"
sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
"github.com/kava-labs/kava/x/cdp/types"
)
// DepositCollateral adds collateral to a cdp
func (k Keeper) DepositCollateral(ctx sdk.Context, owner, depositor sdk.AccAddress, collateral sdk.Coin) error {
// check that collateral exists and has a functioning pricefeed
err := k.ValidateCollateral(ctx, collateral)
if err != nil {
return err
}
cdp, found := k.GetCdpByOwnerAndDenom(ctx, owner, collateral.Denom)
if !found {
return sdkerrors.Wrapf(types.ErrCdpNotFound, "owner %s, collateral %s", owner, collateral.Denom)
}
deposit, found := k.GetDeposit(ctx, cdp.ID, depositor)
if found {
deposit.Amount = deposit.Amount.Add(collateral)
} else {
deposit = types.NewDeposit(cdp.ID, depositor, collateral)
}
err = k.supplyKeeper.SendCoinsFromAccountToModule(ctx, depositor, types.ModuleName, sdk.NewCoins(collateral))
if err != nil {
return err
}
ctx.EventManager().EmitEvent(
sdk.NewEvent(
types.EventTypeCdpDeposit,
sdk.NewAttribute(sdk.AttributeKeyAmount, collateral.String()),
sdk.NewAttribute(types.AttributeKeyCdpID, fmt.Sprintf("%d", cdp.ID)),
),
)
k.SetDeposit(ctx, deposit)
oldCollateralToDebtRatio := k.CalculateCollateralToDebtRatio(ctx, cdp.Collateral, cdp.Principal.Add(cdp.AccumulatedFees))
k.RemoveCdpCollateralRatioIndex(ctx, cdp.Collateral.Denom, cdp.ID, oldCollateralToDebtRatio)
cdp.Collateral = cdp.Collateral.Add(collateral)
collateralToDebtRatio := k.CalculateCollateralToDebtRatio(ctx, cdp.Collateral, cdp.Principal.Add(cdp.AccumulatedFees))
err = k.SetCdpAndCollateralRatioIndex(ctx, cdp, collateralToDebtRatio)
if err != nil {
return err
}
return nil
}
// WithdrawCollateral removes collateral from a cdp if it does not put the cdp below the liquidation ratio
func (k Keeper) WithdrawCollateral(ctx sdk.Context, owner, depositor sdk.AccAddress, collateral sdk.Coin) error {
err := k.ValidateCollateral(ctx, collateral)
if err != nil {
return err
}
cdp, found := k.GetCdpByOwnerAndDenom(ctx, owner, collateral.Denom)
if !found {
return sdkerrors.Wrapf(types.ErrCdpNotFound, "owner %s, collateral %s", owner, collateral.Denom)
}
deposit, found := k.GetDeposit(ctx, cdp.ID, depositor)
if !found {
return sdkerrors.Wrapf(types.ErrDepositNotFound, "depositor %s, collateral %s", depositor, collateral.Denom)
}
if collateral.Amount.GT(deposit.Amount.Amount) {
return sdkerrors.Wrapf(types.ErrInvalidWithdrawAmount, "collateral %s, deposit %s", collateral, deposit.Amount)
}
collateralizationRatio, err := k.CalculateCollateralizationRatio(ctx, cdp.Collateral.Sub(collateral), cdp.Principal, cdp.AccumulatedFees, spot)
if err != nil {
return err
}
liquidationRatio := k.getLiquidationRatio(ctx, collateral.Denom)
if collateralizationRatio.LT(liquidationRatio) {
return sdkerrors.Wrapf(types.ErrInvalidCollateralRatio, "collateral %s, collateral ratio %s, liquidation ration %s", collateral.Denom, collateralizationRatio, liquidationRatio)
}
ctx.EventManager().EmitEvent(
sdk.NewEvent(
types.EventTypeCdpWithdrawal,
sdk.NewAttribute(sdk.AttributeKeyAmount, collateral.String()),
sdk.NewAttribute(types.AttributeKeyCdpID, fmt.Sprintf("%d", cdp.ID)),
),
)
err = k.supplyKeeper.SendCoinsFromModuleToAccount(ctx, types.ModuleName, depositor, sdk.NewCoins(collateral))
if err != nil {
panic(err)
}
oldCollateralToDebtRatio := k.CalculateCollateralToDebtRatio(ctx, cdp.Collateral, cdp.Principal.Add(cdp.AccumulatedFees))
k.RemoveCdpCollateralRatioIndex(ctx, cdp.Collateral.Denom, cdp.ID, oldCollateralToDebtRatio)
cdp.Collateral = cdp.Collateral.Sub(collateral)
collateralToDebtRatio := k.CalculateCollateralToDebtRatio(ctx, cdp.Collateral, cdp.Principal.Add(cdp.AccumulatedFees))
err = k.SetCdpAndCollateralRatioIndex(ctx, cdp, collateralToDebtRatio)
if err != nil {
return err
}
deposit.Amount = deposit.Amount.Sub(collateral)
// delete deposits if amount is 0
if deposit.Amount.IsZero() {
k.DeleteDeposit(ctx, deposit.CdpID, deposit.Depositor)
} else {
k.SetDeposit(ctx, deposit)
}
return nil
}
// GetDeposit returns the deposit of a depositor on a particular cdp from the store
func (k Keeper) GetDeposit(ctx sdk.Context, cdpID uint64, depositor sdk.AccAddress) (deposit types.Deposit, found bool) {
store := prefix.NewStore(ctx.KVStore(k.key), types.DepositKeyPrefix)
bz := store.Get(types.DepositKey(cdpID, depositor))
if bz == nil {
return deposit, false
}
k.cdc.MustUnmarshalBinaryLengthPrefixed(bz, &deposit)
return deposit, true
}
// SetDeposit sets the deposit in the store
func (k Keeper) SetDeposit(ctx sdk.Context, deposit types.Deposit) {
store := prefix.NewStore(ctx.KVStore(k.key), types.DepositKeyPrefix)
bz := k.cdc.MustMarshalBinaryLengthPrefixed(deposit)
store.Set(types.DepositKey(deposit.CdpID, deposit.Depositor), bz)
}
// DeleteDeposit deletes a deposit from the store
func (k Keeper) DeleteDeposit(ctx sdk.Context, cdpID uint64, depositor sdk.AccAddress) {
store := prefix.NewStore(ctx.KVStore(k.key), types.DepositKeyPrefix)
store.Delete(types.DepositKey(cdpID, depositor))
}
// IterateDeposits iterates over the all the deposits of a cdp and performs a callback function
func (k Keeper) IterateDeposits(ctx sdk.Context, cdpID uint64, cb func(deposit types.Deposit) (stop bool)) {
store := prefix.NewStore(ctx.KVStore(k.key), types.DepositKeyPrefix)
iterator := sdk.KVStorePrefixIterator(store, types.GetCdpIDBytes(cdpID))
defer iterator.Close()
for ; iterator.Valid(); iterator.Next() {
var deposit types.Deposit
k.cdc.MustUnmarshalBinaryLengthPrefixed(iterator.Value(), &deposit)
if cb(deposit) {
break
}
}
}
// GetDeposits returns all the deposits to a cdp
func (k Keeper) GetDeposits(ctx sdk.Context, cdpID uint64) (deposits types.Deposits) {
k.IterateDeposits(ctx, cdpID, func(deposit types.Deposit) bool {
deposits = append(deposits, deposit)
return false
})
return
}