package keeper import ( "fmt" "time" sdk "github.com/cosmos/cosmos-sdk/types" "github.com/cosmos/cosmos-sdk/x/supply" "github.com/kava-labs/kava/x/auction/types" ) // StartForwardAuction starts a normal auction that mints the sold coins. func (k Keeper) StartForwardAuction(ctx sdk.Context, seller string, lot sdk.Coin, bidDenom string) (uint64, sdk.Error) { // create auction auction := types.NewForwardAuction(seller, lot, bidDenom, ctx.BlockTime().Add(types.DefaultMaxAuctionDuration)) // take coins from module account err := k.supplyKeeper.SendCoinsFromModuleToModule(ctx, seller, types.ModuleName, sdk.NewCoins(lot)) if err != nil { return 0, err } // store the auction auctionID, err := k.StoreNewAuction(ctx, auction) if err != nil { return 0, err } return auctionID, nil } // StartReverseAuction starts an auction where sellers compete by offering decreasing prices. func (k Keeper) StartReverseAuction(ctx sdk.Context, buyer string, bid sdk.Coin, initialLot sdk.Coin) (uint64, sdk.Error) { // create auction auction := types.NewReverseAuction(buyer, bid, initialLot, ctx.BlockTime().Add(types.DefaultMaxAuctionDuration)) // This auction type mints coins at close. Need to check module account has minting privileges to avoid potential err in endblocker. macc := k.supplyKeeper.GetModuleAccount(ctx, buyer) if !macc.HasPermission(supply.Minter) { // TODO ideally don't want to import supply return 0, sdk.ErrInternal("module does not have minting permissions") } // store the auction auctionID, err := k.StoreNewAuction(ctx, auction) if err != nil { return 0, err } return auctionID, nil } // StartForwardReverseAuction starts an auction where bidders bid up to a maxBid, then switch to bidding down on price. func (k Keeper) StartForwardReverseAuction(ctx sdk.Context, seller string, lot sdk.Coin, maxBid sdk.Coin, lotReturnAddrs []sdk.AccAddress, lotReturnWeights []sdk.Int) (uint64, sdk.Error) { // create auction weightedAddresses, err := types.NewWeightedAddresses(lotReturnAddrs, lotReturnWeights) if err != nil { return 0, err } auction := types.NewForwardReverseAuction(seller, lot, ctx.BlockTime().Add(types.DefaultMaxAuctionDuration), maxBid, weightedAddresses) // take coins from module account err = k.supplyKeeper.SendCoinsFromModuleToModule(ctx, seller, types.ModuleName, sdk.NewCoins(lot)) if err != nil { return 0, err } // store the auction auctionID, err := k.StoreNewAuction(ctx, auction) if err != nil { return 0, err } return auctionID, nil } // PlaceBid places a bid on any auction. // TODO passing bid and lot is weird when only one needed func (k Keeper) PlaceBid(ctx sdk.Context, auctionID uint64, bidder sdk.AccAddress, bid sdk.Coin, lot sdk.Coin) sdk.Error { // get auction from store auction, found := k.GetAuction(ctx, auctionID) if !found { return sdk.ErrInternal("auction doesn't exist") } // validate if ctx.BlockTime().After(auction.GetEndTime()) { return sdk.ErrInternal("auction has closed") } if auction.GetBid().Denom != bid.Denom { return sdk.ErrInternal("bid has incorrect denom") } if auction.GetLot().Denom != lot.Denom { return sdk.ErrInternal("lot has incorrect denom") } // place bid var err sdk.Error var a types.Auction switch auc := auction.(type) { case types.ForwardAuction: a, err = k.PlaceBidForward(ctx, auc, bidder, bid) if err != nil { return err } case types.ReverseAuction: a, err = k.PlaceBidReverse(ctx, auc, bidder, lot) if err != nil { return err } case types.ForwardReverseAuction: a, err = k.PlaceBidForwardReverse(ctx, auc, bidder, bid, lot) if err != nil { return err } default: panic(fmt.Sprintf("unrecognized auction type: %T", auction)) } // store updated auction k.SetAuction(ctx, a) return nil } func (k Keeper) PlaceBidForward(ctx sdk.Context, a types.ForwardAuction, bidder sdk.AccAddress, bid sdk.Coin) (types.ForwardAuction, sdk.Error) { // Valid New Bid if bid.Denom != a.Bid.Denom { return a, sdk.ErrInternal("bid denom doesn't match auction") } if !a.Bid.IsLT(bid) { // TODO add minimum bid size return a, sdk.ErrInternal("bid not greater than last bid") } // Move Coins increment := bid.Sub(a.Bid) bidAmtToReturn := a.Bid if bidder.Equals(a.Bidder) { // catch edge case of someone updating their bid with a low balance bidAmtToReturn = sdk.NewInt64Coin(a.Bid.Denom, 0) } err := k.supplyKeeper.SendCoinsFromAccountToModule(ctx, bidder, types.ModuleName, sdk.NewCoins(bidAmtToReturn.Add(increment))) if err != nil { return a, err } err = k.supplyKeeper.SendCoinsFromModuleToAccount(ctx, types.ModuleName, a.Bidder, sdk.NewCoins(bidAmtToReturn)) if err != nil { return a, err } err = k.supplyKeeper.SendCoinsFromModuleToModule(ctx, types.ModuleName, a.Initiator, sdk.NewCoins(increment)) // increase in bid size is burned if err != nil { return a, err } err = k.supplyKeeper.BurnCoins(ctx, a.Initiator, sdk.NewCoins(increment)) if err != nil { return a, err } // Update Auction a.Bidder = bidder a.Bid = bid // increment timeout a.EndTime = earliestTime(ctx.BlockTime().Add(types.DefaultBidDuration), a.MaxEndTime) return a, nil } func (k Keeper) PlaceBidForwardReverse(ctx sdk.Context, a types.ForwardReverseAuction, bidder sdk.AccAddress, bid sdk.Coin, lot sdk.Coin) (types.ForwardReverseAuction, sdk.Error) { // Validate New Bid // TODO min bid increments, make validation code less confusing if !a.Bid.IsEqual(a.MaxBid) { // Auction is in forward phase, a bid here can put the auction into forward or reverse phases if !a.Bid.IsLT(bid) { return a, sdk.ErrInternal("auction in forward phase, new bid not higher than last bid") } if a.MaxBid.IsLT(bid) { return a, sdk.ErrInternal("bid higher than max bid") } if lot.IsNegative() || a.Lot.IsLT(lot) { return a, sdk.ErrInternal("lot out of bounds") } if lot.IsLT(a.Lot) && !bid.IsEqual(a.MaxBid) { return a, sdk.ErrInternal("auction cannot enter reverse phase without bidding max bid") } } else { // Auction is in reverse phase, it can never leave reverse phase if !bid.IsEqual(a.MaxBid) { return a, sdk.ErrInternal("") // not necessary } if lot.IsNegative() { return a, sdk.ErrInternal("can't bid negative amount") } if !lot.IsLT(a.Lot) { return a, sdk.ErrInternal("auction in reverse phase, new bid not less than previous amount") } } // Move Coins bidIncrement := bid.Sub(a.Bid) bidAmtToReturn := a.Bid lotDecrement := a.Lot.Sub(lot) if bidder.Equals(a.Bidder) { // catch edge case of someone updating their bid with a low balance bidAmtToReturn = sdk.NewInt64Coin(a.Bid.Denom, 0) } err := k.supplyKeeper.SendCoinsFromAccountToModule(ctx, bidder, types.ModuleName, sdk.NewCoins(bidAmtToReturn.Add(bidIncrement))) if err != nil { return a, err } err = k.supplyKeeper.SendCoinsFromModuleToAccount(ctx, types.ModuleName, a.Bidder, sdk.NewCoins(bidAmtToReturn)) if err != nil { return a, err } err = k.supplyKeeper.SendCoinsFromModuleToModule(ctx, types.ModuleName, a.Initiator, sdk.NewCoins(bidIncrement)) if err != nil { return a, err } // FIXME paying out rateably to cdp depositors is vulnerable to errors compounding over multiple bids lotPayouts, err := splitCoinIntoWeightedBuckets(lotDecrement, a.LotReturns.Weights) if err != nil { return a, err } for i, payout := range lotPayouts { err = k.supplyKeeper.SendCoinsFromModuleToAccount(ctx, types.ModuleName, a.LotReturns.Addresses[i], sdk.NewCoins(payout)) if err != nil { return a, err } } // Update Auction a.Bidder = bidder a.Lot = lot a.Bid = bid // increment timeout a.EndTime = earliestTime(ctx.BlockTime().Add(types.DefaultBidDuration), a.MaxEndTime) return a, nil } func (k Keeper) PlaceBidReverse(ctx sdk.Context, a types.ReverseAuction, bidder sdk.AccAddress, lot sdk.Coin) (types.ReverseAuction, sdk.Error) { // Validate New Bid if lot.Denom != a.Lot.Denom { return a, sdk.ErrInternal("lot denom doesn't match auction") } if lot.IsNegative() { return a, sdk.ErrInternal("lot less than 0") } if !lot.IsLT(a.Lot) { // TODO add min bid decrements return a, sdk.ErrInternal("lot not smaller than last lot") } // Move Coins bidAmtToReturn := a.Bid if bidder.Equals(a.Bidder) { // catch edge case of someone updating their bid with a low balance bidAmtToReturn = sdk.NewInt64Coin(a.Bid.Denom, 0) } err := k.supplyKeeper.SendCoinsFromAccountToModule(ctx, bidder, types.ModuleName, sdk.NewCoins(bidAmtToReturn)) if err != nil { return a, err } err = k.supplyKeeper.SendCoinsFromModuleToAccount(ctx, types.ModuleName, a.Bidder, sdk.NewCoins(bidAmtToReturn)) if err != nil { return a, err } // Update Auction a.Bidder = bidder a.Lot = lot // increment timeout a.EndTime = earliestTime(ctx.BlockTime().Add(types.DefaultBidDuration), a.MaxEndTime) return a, nil } // CloseAuction closes an auction and distributes funds to the highest bidder. func (k Keeper) CloseAuction(ctx sdk.Context, auctionID uint64) sdk.Error { // get the auction from the store auction, found := k.GetAuction(ctx, auctionID) if !found { return sdk.ErrInternal("auction doesn't exist") } // error if auction has not reached the end time if ctx.BlockTime().Before(auction.GetEndTime()) { return sdk.ErrInternal(fmt.Sprintf("auction can't be closed as curent block time (%v) is under auction end time (%v)", ctx.BlockTime(), auction.GetEndTime())) } // payout to the last bidder var err sdk.Error switch auc := auction.(type) { case types.ForwardAuction, types.ForwardReverseAuction: err = k.PayoutAuctionLot(ctx, auc) if err != nil { return err } case types.ReverseAuction: err = k.MintAndPayoutAuctionLot(ctx, auc) if err != nil { return err } default: panic("unrecognized auction type") } // Delete auction from store (and queue) k.DeleteAuction(ctx, auctionID) return nil } func (k Keeper) MintAndPayoutAuctionLot(ctx sdk.Context, a types.ReverseAuction) sdk.Error { err := k.supplyKeeper.MintCoins(ctx, a.Initiator, sdk.NewCoins(a.Lot)) if err != nil { return err } err = k.supplyKeeper.SendCoinsFromModuleToAccount(ctx, a.Initiator, a.Bidder, sdk.NewCoins(a.Lot)) if err != nil { return err } return nil } func (k Keeper) PayoutAuctionLot(ctx sdk.Context, a types.Auction) sdk.Error { err := k.supplyKeeper.SendCoinsFromModuleToAccount(ctx, types.ModuleName, a.GetBidder(), sdk.NewCoins(a.GetLot())) if err != nil { return err } return nil } // earliestTime returns the earliest of two times. func earliestTime(t1, t2 time.Time) time.Time { if t1.Before(t2) { return t1 } else { return t2 // also returned if times are equal } } func splitCoinIntoWeightedBuckets(coin sdk.Coin, buckets []sdk.Int) ([]sdk.Coin, sdk.Error) { for _, bucket := range buckets { if bucket.IsNegative() { return nil, sdk.ErrInternal("cannot split coin into bucket with negative weight") } } amounts := splitIntIntoWeightedBuckets(coin.Amount, buckets) result := make([]sdk.Coin, len(amounts)) for i, a := range amounts { result[i] = sdk.NewCoin(coin.Denom, a) } return result, nil }