gpu-compute-chain/x/cosmostest/keeper/auction_expiry.go

package keeper

import (
	"cosmos-test/x/cosmostest/memdb"
	"math/big"

	"github.com/cosmos/cosmos-sdk/types"
	sdk "github.com/cosmos/cosmos-sdk/types"
	"github.com/pkg/errors"
)

func (k *Keeper) AuctionIsExpired(ctx types.Context, auctionId string) (bool, error) {
	auction, found := k.GetAuction(ctx, auctionId)

	// make sure the auction exists on-chain
	if !found {
		return true, errors.Errorf("auction %s not found", auctionId)
	}

	return uint64(ctx.BlockHeight()) >= auction.Deadline, nil
}

func (k *Keeper) EndExpiredAuctions(ctx types.Context) {
	memdb.BidDB.ForEachAuction(func(auctionId string) error {
		auction, found := k.GetAuction(ctx, auctionId)
		// make sure the auction exists on-chain
		if !found {
			return errors.Errorf("auction %s not found on-chain", auctionId)
		}

		if uint64(ctx.BlockHeight()) >= auction.Deadline {
			var err error
			auction.Best, err = memdb.BidDB.GetLowestBid(auctionId)
			if err != nil {
				return errors.Errorf("could not get highest bid for auction %s: %s", auctionId, err)
			}

			// clear auction
			memdb.BidDB.ClearAuction(auctionId)

			// pay out remainder to auction creator
			ceiling := new(big.Int)
			ceiling.SetString(auction.Ceiling, 10)
			lowestBidAmt := new(big.Int)
			lowestBidAmt.SetString(auction.Best.Amount, 10)
			// only pay out if there is a difference
			if ceiling.Cmp(lowestBidAmt) == 1 {
				amtRemaining := new(big.Int)
				amtRemaining.Sub(ceiling, lowestBidAmt)
				coins := sdk.NewCoins(sdk.Coin{
					Amount: sdk.NewIntFromBigInt(amtRemaining),
					Denom:  auction.Denom,
				})
				k.bank.SendCoinsFromModuleToAccount(ctx, "cosmostest", sdk.AccAddress(auction.Owner), coins)
			}

			// end auction
			k.SetAuction(ctx, auction)
		}

		return nil
	})
}