add token price UTs

libs/mocks/src/pools.rs

@@ -1,8 +1,7 @@
 #[frame_support::pallet(dev_mode)]
 pub mod pallet {
 	use cfg_traits::{
-		investments::InvestmentAccountant, PoolInspect, PoolReserve, PriceValue, Seconds,
-		TrancheTokenPrice,
+		investments::InvestmentAccountant, PoolInspect, PoolReserve, Seconds, TrancheTokenPrice,
 	};
 	use cfg_types::investments::InvestmentInfo;
 	use frame_support::pallet_prelude::*;
@@ -86,6 +85,12 @@ pub mod pallet {
 			register_call!(move |(a, b, c, d)| f(a, b, c, d));
 		}
 
+		pub fn mock_get_price(
+			f: impl Fn(T::PoolId, T::TrancheId) -> Option<(T::BalanceRatio, Seconds)> + 'static,
+		) {
+			register_call!(move |(a, b)| f(a, b));
+		}
+
 		#[allow(non_snake_case)]
 		pub fn mock_InvestmentAccountant_deposit(
 			f: impl Fn(&T::AccountId, T::TrancheCurrency, T::Balance) -> DispatchResult + 'static,
@@ -168,10 +173,7 @@ pub mod pallet {
 		type PoolId = T::PoolId;
 		type TrancheId = T::TrancheId;
 
-		fn get(
-			a: T::PoolId,
-			b: T::TrancheId,
-		) -> Option<PriceValue<T::CurrencyId, T::BalanceRatio, Seconds>> {
+		fn get_price(a: T::PoolId, b: T::TrancheId) -> Option<(T::BalanceRatio, Seconds)> {
 			execute_call!((a, b))
 		}
 	}

libs/traits/src/lib.rs

@@ -96,10 +96,10 @@ pub trait TrancheTokenPrice<AccountId, CurrencyId> {
 	type BalanceRatio;
 	type Moment;
 
-	fn get(
+	fn get_price(
 		pool_id: Self::PoolId,
 		tranche_id: Self::TrancheId,
-	) -> Option<PriceValue<CurrencyId, Self::BalanceRatio, Self::Moment>>;
+	) -> Option<(Self::BalanceRatio, Self::Moment)>;
 }
 
 /// Variants for valid Pool updates to send out as events
@@ -206,31 +206,6 @@ pub trait PoolWriteOffPolicyMutate<PoolId> {
 	fn worst_case_policy() -> Self::Policy;
 }
 
-/// A trait that can be used to retrieve the current price for a currency
-pub struct CurrencyPair<CurrencyId> {
-	pub base: CurrencyId,
-	pub quote: CurrencyId,
-}
-
-pub struct PriceValue<CurrencyId, Rate, Moment> {
-	pub pair: CurrencyPair<CurrencyId>,
-	pub price: Rate,
-	pub last_updated: Moment,
-}
-
-pub trait CurrencyPrice<CurrencyId> {
-	type Rate;
-	type Moment;
-
-	/// Retrieve the latest price of `base` currency, denominated in the `quote`
-	/// currency If `quote` currency is not passed, then the default `quote`
-	/// currency is used (when possible)
-	fn get_latest(
-		base: CurrencyId,
-		quote: Option<CurrencyId>,
-	) -> Option<PriceValue<CurrencyId, Self::Rate, Self::Moment>>;
-}
-
 pub trait Permissions<AccountId> {
 	type Scope;
 	type Role;

pallets/liquidity-pools/src/lib.rs

@@ -426,7 +426,7 @@ pub mod pallet {
 			// TODO(future): Once we diverge from 1-to-1 conversions for foreign and pool
 			// currencies, this price must be first converted into the currency_id and then
 			// re-denominated to 18 decimals (i.e. `Ratio` precision)
-			let price_value = T::TrancheTokenPrice::get(pool_id, tranche_id)
+			let (price, computed_at) = T::TrancheTokenPrice::get_price(pool_id, tranche_id)
 				.ok_or(Error::<T>::MissingTranchePrice)?;
 
 			// Check that the registered asset location matches the destination
@@ -447,8 +447,8 @@ pub mod pallet {
 					pool_id,
 					tranche_id,
 					currency,
-					price: price_value.price,
-					computed_at: price_value.last_updated,
+					price,
+					computed_at,
 				},
 			)?;
 

pallets/liquidity-pools/src/mock.rs

@@ -7,13 +7,13 @@ use cfg_types::{
 };
 use frame_support::derive_impl;
 use orml_traits::parameter_type_with_key;
-use sp_runtime::{traits::IdentityLookup, AccountId32, DispatchResult, FixedU64};
+use sp_runtime::{traits::IdentityLookup, AccountId32, DispatchResult, FixedU128};
 
 use crate::pallet as pallet_liquidity_pools;
 
 pub type Balance = u128;
 pub type AccountId = AccountId32;
-pub type Ratio = FixedU64;
+pub type Ratio = FixedU128;
 
 frame_support::construct_runtime!(
 	pub enum Runtime {

pallets/liquidity-pools/src/tests.rs

@@ -35,6 +35,7 @@ const NAME: &[u8] = b"Token name";
 const SYMBOL: &[u8] = b"Token symbol";
 const DECIMALS: u8 = 6;
 const TRANCHE_CURRENCY: CurrencyId = CurrencyId::Tranche(POOL_ID, TRANCHE_ID);
+const PRICE: Ratio = Ratio::from_rational(10, 1);
 
 mod util {
 	use super::*;
@@ -118,7 +119,7 @@ mod transfer {
 		})
 	}
 
-	mod erroring_out_when {
+	mod erroring_out {
 		use super::*;
 
 		#[test]
@@ -326,7 +327,7 @@ mod transfer_tranche_tokens {
 		})
 	}
 
-	mod erroring_out_when {
+	mod erroring_out {
 		use super::*;
 
 		#[test]
@@ -461,7 +462,7 @@ mod add_pool {
 		})
 	}
 
-	mod erroring_out_when {
+	mod erroring_out {
 		use super::*;
 
 		#[test]
@@ -540,7 +541,7 @@ mod add_tranche {
 		})
 	}
 
-	mod erroring_out_when {
+	mod erroring_out {
 		use super::*;
 
 		#[test]
@@ -619,6 +620,82 @@ mod add_tranche {
 	}
 }
 
+mod update_token_price {
+	use super::*;
+
+	#[test]
+	fn success() {
+		System::externalities().execute_with(|| {
+			Pools::mock_get_price(|_, _| Some((PRICE, 1234)));
+			AssetRegistry::mock_metadata(|_| Some(util::wrapped_transferable_metadata()));
+			Gateway::mock_submit(|sender, destination, msg| {
+				assert_eq!(sender, ALICE);
+				assert_eq!(destination, EVM_ADDRESS.domain());
+				assert_eq!(
+					msg,
+					Message::UpdateTrancheTokenPrice {
+						pool_id: POOL_ID,
+						tranche_id: TRANCHE_ID,
+						currency: util::currency_index(CURRENCY_ID),
+						price: PRICE,
+						computed_at: 1234
+					}
+				);
+				Ok(())
+			});
+
+			assert_ok!(LiquidityPools::update_token_price(
+				RuntimeOrigin::signed(ALICE),
+				POOL_ID,
+				TRANCHE_ID,
+				CURRENCY_ID,
+				EVM_ADDRESS.domain(),
+			));
+		})
+	}
+
+	mod erroring_out {
+		use super::*;
+
+		#[test]
+		fn with_missing_tranche_price() {
+			System::externalities().execute_with(|| {
+				Pools::mock_get_price(|_, _| None);
+
+				assert_noop!(
+					LiquidityPools::update_token_price(
+						RuntimeOrigin::signed(ALICE),
+						POOL_ID,
+						TRANCHE_ID,
+						CURRENCY_ID,
+						EVM_ADDRESS.domain(),
+					),
+					Error::<Runtime>::MissingTranchePrice,
+				);
+			})
+		}
+
+		#[test]
+		fn with_no_transferible_asset() {
+			System::externalities().execute_with(|| {
+				Pools::mock_get_price(|_, _| Some((PRICE, 1234)));
+				AssetRegistry::mock_metadata(|_| Some(util::default_metadata()));
+
+				assert_noop!(
+					LiquidityPools::update_token_price(
+						RuntimeOrigin::signed(ALICE),
+						POOL_ID,
+						TRANCHE_ID,
+						CURRENCY_ID,
+						EVM_ADDRESS.domain(),
+					),
+					Error::<Runtime>::AssetNotLiquidityPoolsTransferable,
+				);
+			})
+		}
+	}
+}
+
 #[test]
 fn receiving_output_message() {
 	System::externalities().execute_with(|| {

pallets/pool-system/src/impls.rs

@@ -14,7 +14,7 @@ use cfg_traits::{
 	changes::ChangeGuard,
 	fee::{PoolFeeBucket, PoolFeesMutate},
 	investments::{InvestmentAccountant, TrancheCurrency},
-	CurrencyPair, PoolUpdateGuard, PriceValue, TrancheTokenPrice, UpdateState,
+	PoolUpdateGuard, TrancheTokenPrice, UpdateState,
 };
 use cfg_types::{epoch::EpochState, investments::InvestmentInfo, pools::PoolFeeInfo};
 use frame_support::traits::{
@@ -62,10 +62,10 @@ impl<T: Config> TrancheTokenPrice<T::AccountId, T::CurrencyId> for Pallet<T> {
 	type PoolId = T::PoolId;
 	type TrancheId = T::TrancheId;
 
-	fn get(
+	fn get_price(
 		pool_id: Self::PoolId,
 		tranche_id: Self::TrancheId,
-	) -> Option<PriceValue<T::CurrencyId, T::BalanceRatio, Seconds>> {
+	) -> Option<(T::BalanceRatio, Seconds)> {
 		let now = T::Time::now();
 		let mut pool = Pool::<T>::get(pool_id)?;
 
@@ -84,21 +84,9 @@ impl<T: Config> TrancheTokenPrice<T::AccountId, T::CurrencyId> for Pallet<T> {
 			.calculate_prices::<T::BalanceRatio, T::Tokens, _>(total_assets, now)
 			.ok()?;
 
-		let base = pool
-			.tranches
-			.tranche_currency(TrancheLoc::Id(tranche_id))?
-			.into();
-
 		let price = prices.get(tranche_index).cloned()?;
 
-		Some(PriceValue {
-			pair: CurrencyPair {
-				base,
-				quote: pool.currency,
-			},
-			price,
-			last_updated: nav_last_updated,
-		})
+		Some((price, nav_last_updated))
 	}
 }