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Harvest: borrows capped by utilization (#714)

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* wrap error borrow exceeds mod acc balance

* address revisions
This commit is contained in:
Denali Marsh 2020-11-11 16:05:17 +01:00 committed by GitHub
parent e43fb9d030
commit cfb1905ad3
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GPG Key ID: 4AEE18F83AFDEB23
3 changed files with 37 additions and 1 deletions
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15
x/harvest/keeper/borrow.go
View File

@ -1,6 +1,8 @@
package keeper
import (
"strings"
sdk "github.com/cosmos/cosmos-sdk/types"
sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
@ -16,7 +18,18 @@ func (k Keeper) Borrow(ctx sdk.Context, borrower sdk.AccAddress, coins sdk.Coins
err = k.supplyKeeper.SendCoinsFromModuleToAccount(ctx, types.ModuleAccountName, borrower, coins)
if err != nil {
return err
if strings.Contains(err.Error(), "insufficient account funds") {
modAccCoins := k.supplyKeeper.GetModuleAccount(ctx, types.ModuleAccountName).GetCoins()
for _, coin := range coins {
_, isNegative := modAccCoins.SafeSub(sdk.NewCoins(coin))
if isNegative {
return sdkerrors.Wrapf(types.ErrBorrowExceedsAvailableBalance,
"the requested borrow amount of %s exceeds the total amount of %s%s available to borrow",
coin, modAccCoins.AmountOf(coin.Denom), coin.Denom,
)
}
}
}
}
borrow, found := k.GetBorrow(ctx, borrower)

21
x/harvest/keeper/borrow_test.go
View File

@ -192,6 +192,27 @@ func (suite *KeeperTestSuite) TestBorrow() {
contains: "no price found for market",
},
},
{
"invalid: borrow exceed module account balance",
args{
priceKAVA: sdk.MustNewDecFromStr("2.00"),
loanToValueKAVA: sdk.MustNewDecFromStr("0.8"),
priceBTCB: sdk.MustNewDecFromStr("0.00"),
loanToValueBTCB: sdk.MustNewDecFromStr("0.01"),
priceBNB: sdk.MustNewDecFromStr("0.00"),
loanToValueBNB: sdk.MustNewDecFromStr("0.01"),
borrower: sdk.AccAddress(crypto.AddressHash([]byte("test"))),
depositCoins: []sdk.Coin{sdk.NewCoin("ukava", sdk.NewInt(100*KAVA_CF))},
previousBorrowCoins: sdk.NewCoins(),
borrowCoins: sdk.NewCoins(sdk.NewCoin("busd", sdk.NewInt(101*BUSD_CF))),
expectedAccountBalance: sdk.NewCoins(),
expectedModAccountBalance: sdk.NewCoins(),
},
errArgs{
expectPass: false,
contains: "exceeds module account balance:",
},
},
}
for _, tc := range testCases {
suite.Run(tc.name, func() {

2
x/harvest/types/errors.go
View File

@ -45,4 +45,6 @@ var (
ErrMarketNotFound = sdkerrors.Register(ModuleName, 19, "no market found for denom")
// ErrPriceNotFound error for when a price for the input market is not found
ErrPriceNotFound = sdkerrors.Register(ModuleName, 20, "no price found for market")
// ErrBorrowExceedsAvailableBalance for when a requested borrow exceeds available module acc balances
ErrBorrowExceedsAvailableBalance = sdkerrors.Register(ModuleName, 21, "exceeds module account balance")
)