package keeper import ( "fmt" "time" "github.com/cosmos/cosmos-sdk/codec" "github.com/cosmos/cosmos-sdk/store/prefix" sdk "github.com/cosmos/cosmos-sdk/types" "github.com/cosmos/cosmos-sdk/x/params/subspace" "github.com/kava-labs/kava/x/cdp/types" ) // Keeper keeper for the cdp module type Keeper struct { key sdk.StoreKey cdc *codec.Codec paramSubspace subspace.Subspace pricefeedKeeper types.PricefeedKeeper supplyKeeper types.SupplyKeeper auctionKeeper types.AuctionKeeper accountKeeper types.AccountKeeper hooks types.CDPHooks maccPerms map[string][]string } // NewKeeper creates a new keeper func NewKeeper(cdc *codec.Codec, key sdk.StoreKey, paramstore subspace.Subspace, pfk types.PricefeedKeeper, ak types.AuctionKeeper, sk types.SupplyKeeper, ack types.AccountKeeper, maccs map[string][]string) Keeper { if !paramstore.HasKeyTable() { paramstore = paramstore.WithKeyTable(types.ParamKeyTable()) } return Keeper{ key: key, cdc: cdc, paramSubspace: paramstore, pricefeedKeeper: pfk, auctionKeeper: ak, supplyKeeper: sk, accountKeeper: ack, hooks: nil, maccPerms: maccs, } } // SetHooks adds hooks to the keeper. func (k *Keeper) SetHooks(hooks types.CDPHooks) *Keeper { if k.hooks != nil { panic("cannot set cdp hooks twice") } k.hooks = hooks return k } // CdpDenomIndexIterator returns an sdk.Iterator for all cdps with matching collateral denom func (k Keeper) CdpDenomIndexIterator(ctx sdk.Context, collateralType string) sdk.Iterator { store := prefix.NewStore(ctx.KVStore(k.key), types.CdpKeyPrefix) db, found := k.GetCollateralTypePrefix(ctx, collateralType) if !found { panic(fmt.Sprintf("denom %s prefix not found", collateralType)) } return sdk.KVStorePrefixIterator(store, types.DenomIterKey(db)) } // CdpCollateralRatioIndexIterator returns an sdk.Iterator for all cdps that have collateral denom // matching denom and collateral:debt ratio LESS THAN targetRatio func (k Keeper) CdpCollateralRatioIndexIterator(ctx sdk.Context, collateralType string, targetRatio sdk.Dec) sdk.Iterator { store := prefix.NewStore(ctx.KVStore(k.key), types.CollateralRatioIndexPrefix) db, found := k.GetCollateralTypePrefix(ctx, collateralType) if !found { panic(fmt.Sprintf("denom %s prefix not found", collateralType)) } return store.Iterator(types.CollateralRatioIterKey(db, sdk.ZeroDec()), types.CollateralRatioIterKey(db, targetRatio)) } // IterateAllCdps iterates over all cdps and performs a callback function func (k Keeper) IterateAllCdps(ctx sdk.Context, cb func(cdp types.CDP) (stop bool)) { store := prefix.NewStore(ctx.KVStore(k.key), types.CdpKeyPrefix) iterator := sdk.KVStorePrefixIterator(store, []byte{}) defer iterator.Close() for ; iterator.Valid(); iterator.Next() { var cdp types.CDP k.cdc.MustUnmarshalBinaryLengthPrefixed(iterator.Value(), &cdp) if cb(cdp) { break } } } // IterateCdpsByCollateralType iterates over cdps with matching denom and performs a callback function func (k Keeper) IterateCdpsByCollateralType(ctx sdk.Context, collateralType string, cb func(cdp types.CDP) (stop bool)) { iterator := k.CdpDenomIndexIterator(ctx, collateralType) defer iterator.Close() for ; iterator.Valid(); iterator.Next() { var cdp types.CDP k.cdc.MustUnmarshalBinaryLengthPrefixed(iterator.Value(), &cdp) if cb(cdp) { break } } } // IterateCdpsByCollateralRatio iterate over cdps with collateral denom equal to denom and // collateral:debt ratio LESS THAN targetRatio and performs a callback function. func (k Keeper) IterateCdpsByCollateralRatio(ctx sdk.Context, collateralType string, targetRatio sdk.Dec, cb func(cdp types.CDP) (stop bool)) { iterator := k.CdpCollateralRatioIndexIterator(ctx, collateralType, targetRatio) defer iterator.Close() for ; iterator.Valid(); iterator.Next() { _, id, _ := types.SplitCollateralRatioKey(iterator.Key()) cdp, found := k.GetCDP(ctx, collateralType, id) if !found { panic(fmt.Sprintf("cdp %d does not exist", id)) } if cb(cdp) { break } } } // GetSliceOfCDPsByRatioAndType returns a slice of cdps of size equal to the input cutoffCount // sorted by target ratio in ascending order (ie, the lowest collateral:debt ratio cdps are returned first) func (k Keeper) GetSliceOfCDPsByRatioAndType(ctx sdk.Context, cutoffCount sdk.Int, targetRatio sdk.Dec, collateralType string) (cdps types.CDPs) { count := sdk.ZeroInt() k.IterateCdpsByCollateralRatio(ctx, collateralType, targetRatio, func(cdp types.CDP) bool { cdps = append(cdps, cdp) count = count.Add(sdk.OneInt()) if count.GTE(cutoffCount) { return true } return false }) return cdps } // GetPreviousAccrualTime returns the last time an individual market accrued interest func (k Keeper) GetPreviousAccrualTime(ctx sdk.Context, ctype string) (time.Time, bool) { store := prefix.NewStore(ctx.KVStore(k.key), types.PreviousAccrualTimePrefix) bz := store.Get([]byte(ctype)) if bz == nil { return time.Time{}, false } var previousAccrualTime time.Time k.cdc.MustUnmarshalBinaryBare(bz, &previousAccrualTime) return previousAccrualTime, true } // SetPreviousAccrualTime sets the most recent accrual time for a particular market func (k Keeper) SetPreviousAccrualTime(ctx sdk.Context, ctype string, previousAccrualTime time.Time) { store := prefix.NewStore(ctx.KVStore(k.key), types.PreviousAccrualTimePrefix) bz := k.cdc.MustMarshalBinaryBare(previousAccrualTime) store.Set([]byte(ctype), bz) } // GetInterestFactor returns the current interest factor for an individual collateral type func (k Keeper) GetInterestFactor(ctx sdk.Context, ctype string) (sdk.Dec, bool) { store := prefix.NewStore(ctx.KVStore(k.key), types.InterestFactorPrefix) bz := store.Get([]byte(ctype)) if bz == nil { return sdk.ZeroDec(), false } var interestFactor sdk.Dec k.cdc.MustUnmarshalBinaryBare(bz, &interestFactor) return interestFactor, true } // SetInterestFactor sets the current interest factor for an individual collateral type func (k Keeper) SetInterestFactor(ctx sdk.Context, ctype string, interestFactor sdk.Dec) { store := prefix.NewStore(ctx.KVStore(k.key), types.InterestFactorPrefix) bz := k.cdc.MustMarshalBinaryBare(interestFactor) store.Set([]byte(ctype), bz) } // IncrementTotalPrincipal increments the total amount of debt that has been drawn with that collateral type func (k Keeper) IncrementTotalPrincipal(ctx sdk.Context, collateralType string, principal sdk.Coin) { total := k.GetTotalPrincipal(ctx, collateralType, principal.Denom) total = total.Add(principal.Amount) k.SetTotalPrincipal(ctx, collateralType, principal.Denom, total) } // DecrementTotalPrincipal decrements the total amount of debt that has been drawn for a particular collateral type func (k Keeper) DecrementTotalPrincipal(ctx sdk.Context, collateralType string, principal sdk.Coin) { total := k.GetTotalPrincipal(ctx, collateralType, principal.Denom) // NOTE: negative total principal can happen in tests due to rounding errors // in fee calculation total = sdk.MaxInt(total.Sub(principal.Amount), sdk.ZeroInt()) k.SetTotalPrincipal(ctx, collateralType, principal.Denom, total) } // GetTotalPrincipal returns the total amount of principal that has been drawn for a particular collateral func (k Keeper) GetTotalPrincipal(ctx sdk.Context, collateralType, principalDenom string) (total sdk.Int) { store := prefix.NewStore(ctx.KVStore(k.key), types.PrincipalKeyPrefix) bz := store.Get([]byte(collateralType + principalDenom)) if bz == nil { k.SetTotalPrincipal(ctx, collateralType, principalDenom, sdk.ZeroInt()) return sdk.ZeroInt() } k.cdc.MustUnmarshalBinaryLengthPrefixed(bz, &total) return total } // SetTotalPrincipal sets the total amount of principal that has been drawn for the input collateral func (k Keeper) SetTotalPrincipal(ctx sdk.Context, collateralType, principalDenom string, total sdk.Int) { store := prefix.NewStore(ctx.KVStore(k.key), types.PrincipalKeyPrefix) _, found := k.GetCollateralTypePrefix(ctx, collateralType) if !found { panic(fmt.Sprintf("collateral not found: %s", collateralType)) } store.Set([]byte(collateralType+principalDenom), k.cdc.MustMarshalBinaryLengthPrefixed(total)) } // getModuleAccountCoins gets the total coin balance of this coin currently held by module accounts func (k Keeper) getModuleAccountCoins(ctx sdk.Context, denom string) sdk.Coins { totalModCoinBalance := sdk.NewCoins(sdk.NewCoin(denom, sdk.ZeroInt())) for macc := range k.maccPerms { modCoinBalance := k.supplyKeeper.GetModuleAccount(ctx, macc).GetCoins().AmountOf(denom) if modCoinBalance.IsPositive() { totalModCoinBalance = totalModCoinBalance.Add(sdk.NewCoin(denom, modCoinBalance)) } } return totalModCoinBalance }