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Change the logic to determine if the pool was depleted #369

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merged 4 commits into from Jun 3, 2021
Merged

Change the logic to determine if the pool was depleted #369

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c55b4ad
keep zero reserve coins from GetReserveCoins
hallazzang May 27, 2021
25dbb2d
treat pool with zero pool coin supply as depleted
hallazzang May 27, 2021
c391959
rollback change of Quo/MulTruncate to Quo/Mul
hallazzang Jun 2, 2021
096a0a0
Merge branch 'develop' of github.com:tendermint/liquidity into hallaz…
hallazzang Jun 2, 2021
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54 changes: 32 additions & 22 deletions x/liquidity/keeper/liquidity_pool.go
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Expand Up @@ -96,29 +96,35 @@ func (k Keeper) CreatePool(ctx sdk.Context, msg *types.MsgCreatePool) (types.Poo

poolName := types.PoolName(reserveCoinDenoms, msg.PoolTypeId)

pool := types.Pool{
//Id: will set on SetPoolAtomic
TypeId: msg.PoolTypeId,
ReserveCoinDenoms: reserveCoinDenoms,
ReserveAccountAddress: types.GetPoolReserveAcc(poolName).String(),
PoolCoinDenom: types.GetPoolCoinDenom(poolName),
}

poolCreator := msg.GetPoolCreator()
poolCreatorBalances := k.bankKeeper.GetAllBalances(ctx, poolCreator)

if !poolCreatorBalances.IsAllGTE(msg.DepositCoins) {
return types.Pool{}, types.ErrInsufficientBalance
}

reserveCoins := k.GetReserveCoins(ctx, pool)

for _, coin := range msg.DepositCoins {
if coin.Amount.LT(params.MinInitDepositAmount) {
if coin.Amount.Add(reserveCoins.AmountOf(coin.Denom)).LT(params.MinInitDepositAmount) {
return types.Pool{}, types.ErrLessThanMinInitDeposit
}
}

if !poolCreatorBalances.IsAllGTE(params.PoolCreationFee.Add(msg.DepositCoins...)) {
return types.Pool{}, types.ErrInsufficientPoolCreationFee
if !poolCreatorBalances.IsAllGTE(msg.DepositCoins) {
return types.Pool{}, types.ErrInsufficientBalance
}

pool := types.Pool{
//Id: will set on SetPoolAtomic
TypeId: msg.PoolTypeId,
ReserveCoinDenoms: reserveCoinDenoms,
ReserveAccountAddress: types.GetPoolReserveAcc(poolName).String(),
PoolCoinDenom: types.GetPoolCoinDenom(poolName),
if !poolCreatorBalances.IsAllGTE(msg.DepositCoins.Add(params.PoolCreationFee...)) {
return types.Pool{}, types.ErrInsufficientPoolCreationFee
}

if _, err := k.MintAndSendPoolCoin(ctx, pool, poolCreator, poolCreator, msg.DepositCoins); err != nil {
Expand All @@ -136,7 +142,7 @@ func (k Keeper) CreatePool(ctx sdk.Context, msg *types.MsgCreatePool) (types.Poo

k.SetPoolBatch(ctx, batch)

reserveCoins := k.GetReserveCoins(ctx, pool)
reserveCoins = k.GetReserveCoins(ctx, pool)
lastReserveRatio := sdk.NewDecFromInt(reserveCoins[0].Amount).QuoTruncate(sdk.NewDecFromInt(reserveCoins[1].Amount))
logger := k.Logger(ctx)
logger.Debug("createPool", msg, "pool", pool, "reserveCoins", reserveCoins, "lastReserveRatio", lastReserveRatio)
Expand Down Expand Up @@ -172,10 +178,10 @@ func (k Keeper) DepositLiquidityPool(ctx sdk.Context, msg types.DepositMsgState,

reserveCoins := k.GetReserveCoins(ctx, pool)

// reinitialize pool in case of reserve coins has run out
if reserveCoins.IsZero() {
// reinitialize pool if the pool is depleted
if k.IsDepletedPool(ctx, pool) {
for _, depositCoin := range msg.Msg.DepositCoins {
if depositCoin.Amount.LT(params.MinInitDepositAmount) {
if depositCoin.Amount.Add(reserveCoins.AmountOf(depositCoin.Denom)).LT(params.MinInitDepositAmount) {
return types.ErrLessThanMinInitDeposit
}
}
Expand All @@ -190,7 +196,7 @@ func (k Keeper) DepositLiquidityPool(ctx sdk.Context, msg types.DepositMsgState,
msg.ToBeDeleted = true
k.SetPoolBatchDepositMsgState(ctx, msg.Msg.PoolId, msg)

reserveCoins := k.GetReserveCoins(ctx, pool)
reserveCoins = k.GetReserveCoins(ctx, pool)
lastReserveCoinA := sdk.NewDecFromInt(reserveCoins[0].Amount)
lastReserveCoinB := sdk.NewDecFromInt(reserveCoins[1].Amount)
lastReserveRatio := lastReserveCoinA.QuoTruncate(lastReserveCoinB)
Expand Down Expand Up @@ -450,7 +456,7 @@ func (k Keeper) WithdrawLiquidityPool(ctx sdk.Context, msg types.WithdrawMsgStat
reserveCoins = k.GetReserveCoins(ctx, pool)

var lastReserveRatio sdk.Dec
if reserveCoins.Empty() {
if reserveCoins.IsZero() {
lastReserveRatio = sdk.ZeroDec()
} else {
lastReserveRatio = sdk.NewDecFromInt(reserveCoins[0].Amount).QuoTruncate(sdk.NewDecFromInt(reserveCoins[1].Amount))
Expand All @@ -469,6 +475,11 @@ func (k Keeper) GetPoolCoinTotalSupply(ctx sdk.Context, pool types.Pool) sdk.Int
return total.AmountOf(pool.PoolCoinDenom)
}

// IsDepletedPool returns true if the pool is depleted.
func (k Keeper) IsDepletedPool(ctx sdk.Context, pool types.Pool) bool {
return !k.GetPoolCoinTotalSupply(ctx, pool).IsPositive()
}

// GetPoolCoinTotal returns total supply of pool coin of the pool in form of sdk.Coin
func (k Keeper) GetPoolCoinTotal(ctx sdk.Context, pool types.Pool) sdk.Coin {
return sdk.NewCoin(pool.PoolCoinDenom, k.GetPoolCoinTotalSupply(ctx, pool))
Expand All @@ -479,7 +490,7 @@ func (k Keeper) GetReserveCoins(ctx sdk.Context, pool types.Pool) (reserveCoins
reserveAcc := pool.GetReserveAccount()
reserveCoins = sdk.NewCoins()
for _, denom := range pool.ReserveCoinDenoms {
reserveCoins = reserveCoins.Add(k.bankKeeper.GetBalance(ctx, reserveAcc, denom))
reserveCoins = append(reserveCoins, k.bankKeeper.GetBalance(ctx, reserveAcc, denom))
}
return
}
Expand Down Expand Up @@ -719,8 +730,7 @@ func (k Keeper) ValidateMsgWithdrawLiquidityPool(ctx sdk.Context, msg types.MsgW
}

poolCoinTotalSupply := k.GetPoolCoinTotalSupply(ctx, pool)

if !poolCoinTotalSupply.IsPositive() || !k.GetReserveCoins(ctx, pool).IsAllPositive() {
if !poolCoinTotalSupply.IsPositive() {
return types.ErrDepletedPool
}

Expand All @@ -742,15 +752,15 @@ func (k Keeper) ValidateMsgSwapWithinBatch(ctx sdk.Context, msg types.MsgSwapWit
return types.ErrNotMatchedReserveCoin
}

if k.IsDepletedPool(ctx, pool) {
return types.ErrDepletedPool
}

params := k.GetParams(ctx)

// can not exceed max order ratio of reserve coins that can be ordered at a order
reserveCoinAmt := k.GetReserveCoins(ctx, pool).AmountOf(msg.OfferCoin.Denom)

if !reserveCoinAmt.IsPositive() {
return types.ErrDepletedPool
}

// Decimal Error, Multiply the Int coin amount by the Decimal Rate and erase the decimal point to order a lower value
maximumOrderableAmt := reserveCoinAmt.ToDec().MulTruncate(params.MaxOrderAmountRatio).TruncateInt()
if msg.OfferCoin.Amount.GT(maximumOrderableAmt) {
Expand Down