check spendable when making bid, groundwork for built-in transfers

x/cosmostest/keeper/auction_expiry.go

@@ -32,8 +32,14 @@ func (k *Keeper) EndExpiredAuctions(ctx types.Context) {
 			if err != nil {
 				return errors.Errorf("could not get highest bid for auction %s: %s", auctionId, err)
 			}
-			k.SetAuction(ctx, auction)
+
+			// clear auction
 			memdb.BidDB.ClearAuction(auctionId)
+
+			// pay out user
+
+			// end auction
+			k.SetAuction(ctx, auction)
 		}
 
 		return nil

x/cosmostest/keeper/keeper.go

@@ -6,6 +6,7 @@ import (
 	"github.com/tendermint/tendermint/libs/log"
 
 	"cosmos-test/x/cosmostest/types"
+
 	"github.com/cosmos/cosmos-sdk/codec"
 	sdk "github.com/cosmos/cosmos-sdk/types"
 	paramtypes "github.com/cosmos/cosmos-sdk/x/params/types"
@@ -17,6 +18,7 @@ type (
 		storeKey   sdk.StoreKey
 		memKey     sdk.StoreKey
 		paramstore paramtypes.Subspace
+		bank       types.BankKeeper
 	}
 )
 
@@ -25,7 +27,7 @@ func NewKeeper(
 	storeKey,
 	memKey sdk.StoreKey,
 	ps paramtypes.Subspace,
-
+	bank types.BankKeeper,
 ) *Keeper {
 	// set KeyTable if it has not already been set
 	if !ps.HasKeyTable() {
@@ -33,11 +35,11 @@ func NewKeeper(
 	}
 
 	return &Keeper{
-
 		cdc:        cdc,
 		storeKey:   storeKey,
 		memKey:     memKey,
 		paramstore: ps,
+		bank:       bank,
 	}
 }
 

x/cosmostest/keeper/msg_server_new_bid.go

@@ -15,7 +15,7 @@ import (
 func (k msgServer) NewBid(goCtx context.Context, msg *types.MsgNewBid) (*types.MsgNewBidResponse, error) {
 	ctx := sdk.UnwrapSDKContext(goCtx)
 
-	_, found := k.Keeper.GetAuction(ctx, msg.AuctionIndex)
+	auction, found := k.Keeper.GetAuction(ctx, msg.AuctionIndex)
 	if !found {
 		return nil, fmt.Errorf("didn't find auction of index %s", msg.AuctionIndex)
 	}
@@ -38,6 +38,17 @@ func (k msgServer) NewBid(goCtx context.Context, msg *types.MsgNewBid) (*types.M
 		return nil, fmt.Errorf("bid amount must be greater than 0")
 	}
 
+	addr, err := sdk.AccAddressFromBech32(msg.Creator)
+	if err != nil {
+		return nil, fmt.Errorf("sender address `%s` format invalid (bech32 required)", msg.Creator)
+	}
+
+	spendable := k.bank.SpendableCoins(ctx, addr)
+	// if balance does not exceed or equal proposed bid amount...
+	if spendable.AmountOf(auction.Denom).BigInt().Cmp(amt) == -1 {
+		return nil, fmt.Errorf("not enough balance to bid %s%s", msg.Amount, auction.Denom)
+	}
+
 	lowestBid, err := memdb.BidDB.GetLowestBid(msg.AuctionIndex)
 	// we manually handle KeyNotFound in GetHighestBid, so should return (nil, nil) if not found
 	if err != nil {