From 527663aae9abcea59dd749387c7a0d542cb0161d Mon Sep 17 00:00:00 2001
From: Martin Hloska <martin.hloska@gmail.com>
Date: Tue, 9 Mar 2021 11:08:09 +0100
Subject: [PATCH] fix: happy clippy - happy life

---
 pallets/amm/src/lib.rs | 21 +++++++--------------
 1 file changed, 7 insertions(+), 14 deletions(-)

diff --git a/pallets/amm/src/lib.rs b/pallets/amm/src/lib.rs
index f6328ffc9..eb563eccd 100644
--- a/pallets/amm/src/lib.rs
+++ b/pallets/amm/src/lib.rs
@@ -280,8 +280,7 @@ decl_module! {
 			let total_liquidity = Self::total_liquidity(&pair_account);
 
 			let amount_b_required = hydra_dx_math::calculate_liquidity_in(asset_a_reserve, asset_b_reserve, amount_a)
-				// TODO: map errors correctly
-			    .map_err(|error| {
+			    .map_err(|_| {
 			        Error::<T>::AddAssetAmountInvalid
 			    })?;
 
@@ -368,8 +367,7 @@ decl_module! {
 			let asset_b_reserve = T::Currency::free_balance(asset_b, &pair_account);
 
 			let liquidity_out = hydra_dx_math::calculate_liquidity_out(asset_a_reserve, asset_b_reserve, liquidity_amount, total_shares)
-				// TODO: map errors correctly
-			    .map_err(|error| {
+			    .map_err(|_| {
 			        Error::<T>::RemoveAssetAmountInvalid
 			    })?;
 
@@ -498,8 +496,7 @@ impl<T: Config> AMM<T::AccountId, AssetId, AssetPair, Balance> for Module<T> {
 		let asset_a_reserve = T::Currency::free_balance(asset_a, &pair_account);
 		let asset_b_reserve = T::Currency::free_balance(asset_b, &pair_account);
 
-        // TODO: refactor
-        hydra_dx_math::calculate_spot_price(asset_a_reserve, asset_b_reserve, amount).unwrap()
+        hydra_dx_math::calculate_spot_price(asset_a_reserve, asset_b_reserve, amount).unwrap_or(Balance::zero())
     }
 
 	fn validate_sell(
@@ -538,8 +535,7 @@ impl<T: Config> AMM<T::AccountId, AssetId, AssetPair, Balance> for Module<T> {
 
 		let transfer_fee = Self::calculate_fees(amount, discount, &mut hdx_amount)?;
 
-        let sale_price = hydra_dx_math::calculate_out_given_in(asset_in_total, asset_out_total, amount - transfer_fee).map_err(|error| {
-			// TODO: map errors correctly
+        let sale_price = hydra_dx_math::calculate_out_given_in(asset_in_total, asset_out_total, amount - transfer_fee).map_err(|_| {
             Error::<T>::SellAssetAmountInvalid
         })?;
 
@@ -559,8 +555,7 @@ impl<T: Config> AMM<T::AccountId, AssetId, AssetPair, Balance> for Module<T> {
 			let asset_reserve = T::Currency::free_balance(assets.asset_in, &hdx_pair_account);
 
             let hdx_fee_spot_price = hydra_dx_math::calculate_spot_price(asset_reserve, hdx_reserve, hdx_amount)
-				// TODO: map errors correctly
-                .map_err(|error| {
+                .map_err(|_| {
                     Error::<T>::CannotApplyDiscount
                 })?;
 
@@ -662,8 +657,7 @@ impl<T: Config> AMM<T::AccountId, AssetId, AssetPair, Balance> for Module<T> {
 		);
 
         let buy_price = hydra_dx_math::calculate_in_given_out(asset_out_reserve, asset_in_reserve, amount + transfer_fee)
-			// TODO: map errors correctly
-            .map_err(|error| {
+            .map_err(|_| {
                 Error::<T>::BuyAssetAmountInvalid
             })?;
 
@@ -686,8 +680,7 @@ impl<T: Config> AMM<T::AccountId, AssetId, AssetPair, Balance> for Module<T> {
 			let asset_reserve = T::Currency::free_balance(assets.asset_out, &hdx_pair_account);
 
             let hdx_fee_spot_price = hydra_dx_math::calculate_spot_price(asset_reserve, hdx_reserve, hdx_amount)
-				// TODO: map errors correctly
-				.map_err(|error| {
+				.map_err(|_| {
                 	Error::<T>::CannotApplyDiscount
             	})?;