Bugfix/liq tokens mgx 434 v2

pallets/xyk/src/lib.rs

@@ -1341,6 +1341,8 @@ impl<T: Config> Pallet<T> {
 		let (input_reserve, output_reserve) =
 			Pallet::<T>::get_reserves(sold_token_id, bought_token_id)?;
 
+		ensure!(!(Self::is_pool_empty(sold_token_id, bought_token_id)?), Error::<T>::PoolIsEmpty);
+
 		Self::calculate_sell_price(input_reserve, output_reserve, sell_amount)
 	}
 
@@ -1352,6 +1354,8 @@ impl<T: Config> Pallet<T> {
 		let (input_reserve, output_reserve) =
 			Pallet::<T>::get_reserves(sold_token_id, bought_token_id)?;
 
+		ensure!(!(Self::is_pool_empty(sold_token_id, bought_token_id)?), Error::<T>::PoolIsEmpty);
+
 		Self::calculate_buy_price(input_reserve, output_reserve, buy_amount)
 	}
 
@@ -1407,6 +1411,8 @@ impl<T: Config> Pallet<T> {
 		let (first_asset_reserve, second_asset_reserve) =
 			Pallet::<T>::get_reserves(first_asset_id, second_asset_id)?;
 
+		ensure!(!(Self::is_pool_empty(first_asset_id, second_asset_id)?), Error::<T>::PoolIsEmpty);
+
 		let (first_asset_amount, second_asset_amount) = Self::get_burn_amount_reserves(
 			first_asset_reserve,
 			second_asset_reserve,
@@ -3061,6 +3067,8 @@ impl<T: Config> XykFunctionsTrait<T::AccountId> for Pallet<T> {
 		// checks
 		ensure!(!provided_asset_amount.is_zero(), Error::<T>::ZeroAmount,);
 
+		ensure!(!(Self::is_pool_empty(first_asset_id, second_asset_id)?), Error::<T>::PoolIsEmpty);
+
 		let (first_reserve, second_reserve) =
 			Pallet::<T>::get_reserves(first_asset_id, second_asset_id)?;
 

pallets/xyk/src/tests.rs

@@ -1867,6 +1867,15 @@ fn burn_all_liq_and_mint_it_again() {
 			Error::<Test>::PoolIsEmpty,
 		);
 
+		// calculate_buy_price_id should fail as pool is empty
+		assert_err!(XykStorage::calculate_buy_price_id(1, 4, 20000), Error::<Test>::PoolIsEmpty,);
+
+		// calculate_sell_price_id should fail as pool is empty
+		assert_err!(XykStorage::calculate_sell_price_id(1, 4, 20000), Error::<Test>::PoolIsEmpty,);
+
+		// get_burn_amount should fail as pool is empty
+		assert_err!(XykStorage::get_burn_amount(1, 4, 20000), Error::<Test>::PoolIsEmpty,);
+
 		let user_assets_1_value_after_sell = XykStorage::balance(1, DUMMY_USER_ID);
 		let user_assets_4_value_after_sell = XykStorage::balance(4, DUMMY_USER_ID);