FI: Add swapping events

libs/mocks/src/token_swaps.rs

@@ -70,6 +70,12 @@ pub mod pallet {
 			register_call!(move |(a, b, c)| f(a, b, c));
 		}
 
+		pub fn mock_market_ratio(
+			f: impl Fn(T::CurrencyId, T::CurrencyId) -> Result<T::Ratio, DispatchError> + 'static,
+		) {
+			register_call!(move |(a, b)| f(a, b));
+		}
+
 		pub fn mock_fill_order(
 			f: impl Fn(T::AccountId, T::OrderId, T::BalanceOut) -> DispatchResult + 'static,
 		) {
@@ -120,6 +126,13 @@ pub mod pallet {
 			execute_call!((a, b, c))
 		}
 
+		fn market_ratio(
+			a: Self::CurrencyId,
+			b: Self::CurrencyId,
+		) -> Result<Self::Ratio, DispatchError> {
+			execute_call!((a, b))
+		}
+
 		fn fill_order(a: T::AccountId, b: Self::OrderId, c: Self::BalanceOut) -> DispatchResult {
 			execute_call!((a, b, c))
 		}

libs/traits/src/swaps.rs

@@ -98,11 +98,17 @@ pub trait TokenSwaps<Account> {
 		currency_out: Self::CurrencyId,
 		amount_out: Self::BalanceOut,
 	) -> Result<Self::BalanceIn, DispatchError>;
+
+	/// Returns the conversion ratio to convert currency out into currency in,
+	fn market_ratio(
+		currency_in: Self::CurrencyId,
+		currency_out: Self::CurrencyId,
+	) -> Result<Self::Ratio, DispatchError>;
 }
 
 /// A representation of a currency swap in process.
 #[derive(Clone, PartialEq, Eq, Debug, Encode, Decode, TypeInfo, MaxEncodedLen)]
-pub struct SwapState<AmountIn, AmountOut, Currency> {
+pub struct SwapInfo<AmountIn, AmountOut, Currency, Ratio> {
 	/// Swap not yet processed with the pending outcomming amount
 	pub remaining: Swap<AmountOut, Currency>,
 
@@ -112,6 +118,9 @@ pub struct SwapState<AmountIn, AmountOut, Currency> {
 	/// Amount of incoming currency already swapped denominated in outgoing
 	/// currency
 	pub swapped_out: AmountOut,
+
+	/// Ratio used to swap `swapped_out` into `swapped_in`
+	pub ratio: Ratio,
 }
 
 /// Used as result of `Pallet::apply_swap()`

pallets/foreign-investments/src/impls.rs

@@ -2,7 +2,7 @@
 
 use cfg_traits::{
 	investments::{ForeignInvestment, Investment, InvestmentCollector},
-	swaps::{SwapState, Swaps},
+	swaps::{Swap, SwapInfo, SwapStatus, Swaps},
 	StatusNotificationHook,
 };
 use cfg_types::investments::CollectedAmount;
@@ -12,8 +12,8 @@ use sp_std::marker::PhantomData;
 
 use crate::{
 	entities::{InvestmentInfo, RedemptionInfo},
-	pallet::{Config, Error, ForeignInvestmentInfo, ForeignRedemptionInfo, Pallet},
-	pool_currency_of, Action, SwapId,
+	pallet::{Config, Error, Event, ForeignInvestmentInfo, ForeignRedemptionInfo, Pallet},
+	pool_currency_of, Action, SwapId, SwapOf,
 };
 
 impl<T: Config> ForeignInvestment<T::AccountId> for Pallet<T> {
@@ -57,6 +57,8 @@ impl<T: Config> ForeignInvestment<T::AccountId> for Pallet<T> {
 				}
 			}
 
+			Pallet::<T>::deposit_apply_swap_events(who, swap_id, &swap, &status)?;
+
 			Ok::<_, DispatchError>(msg)
 		})?;
 
@@ -108,6 +110,8 @@ impl<T: Config> ForeignInvestment<T::AccountId> for Pallet<T> {
 				}
 			}
 
+			Pallet::<T>::deposit_apply_swap_events(who, swap_id, &swap, &status)?;
+
 			if info.is_completed(who, investment_id)? {
 				*entry = None;
 			}
@@ -209,23 +213,66 @@ impl<T: Config> ForeignInvestment<T::AccountId> for Pallet<T> {
 	}
 }
 
+impl<T: Config> Pallet<T> {
+	fn deposit_apply_swap_events(
+		who: &T::AccountId,
+		swap_id: SwapId<T>,
+		swap: &SwapOf<T>,
+		status: &SwapStatus<T::SwapBalance>,
+	) -> DispatchResult {
+		if !status.swapped.is_zero() {
+			Pallet::<T>::deposit_event(Event::SwapCancelled {
+				who: who.clone(),
+				swap_id,
+				remaining: Swap {
+					amount_out: status.pending,
+					..swap.clone()
+				},
+				cancelled_in: status.swapped,
+				opposite_in: T::Swaps::pending_amount(who, swap_id, swap.currency_in)?,
+			});
+		}
+
+		if !status.pending.is_zero() {
+			Pallet::<T>::deposit_event(Event::SwapCreated {
+				who: who.clone(),
+				swap_id,
+				swap: Swap {
+					amount_out: status.pending,
+					..swap.clone()
+				},
+			})
+		}
+
+		Ok(())
+	}
+}
+
 pub struct FulfilledSwapHook<T>(PhantomData<T>);
 impl<T: Config> StatusNotificationHook for FulfilledSwapHook<T> {
 	type Error = DispatchError;
 	type Id = (T::AccountId, SwapId<T>);
-	type Status = SwapState<T::SwapBalance, T::SwapBalance, T::CurrencyId>;
+	type Status = SwapInfo<T::SwapBalance, T::SwapBalance, T::CurrencyId, T::SwapRatio>;
 
 	fn notify_status_change(
 		(who, (investment_id, action)): Self::Id,
-		swap_state: Self::Status,
+		swap_info: Self::Status,
 	) -> DispatchResult {
 		let pool_currency = pool_currency_of::<T>(investment_id)?;
-		let swapped_amount_in = swap_state.swapped_in;
-		let swapped_amount_out = swap_state.swapped_out;
-		let pending_amount = swap_state.remaining.amount_out;
+		let swapped_amount_in = swap_info.swapped_in;
+		let swapped_amount_out = swap_info.swapped_out;
+		let pending_amount = swap_info.remaining.amount_out;
+
+		Pallet::<T>::deposit_event(Event::SwapFullfilled {
+			who: who.clone(),
+			swap_id: (investment_id, action),
+			remaining: swap_info.remaining.clone(),
+			swapped_in: swap_info.swapped_in,
+			swapped_out: swap_info.swapped_out,
+		});
 
 		match action {
-			Action::Investment => match pool_currency == swap_state.remaining.currency_in {
+			Action::Investment => match pool_currency == swap_info.remaining.currency_in {
 				true => SwapDone::<T>::for_increase_investment(
 					&who,
 					investment_id,
@@ -308,7 +355,9 @@ impl<T: Config> StatusNotificationHook for CollectedRedemptionHook<T> {
 
 		if let Some(swap) = swap {
 			let swap_id = (investment_id, Action::Redemption);
-			let status = T::Swaps::apply_swap(&who, swap_id, swap)?;
+			let status = T::Swaps::apply_swap(&who, swap_id, swap.clone())?;
+
+			Pallet::<T>::deposit_apply_swap_events(&who, swap_id, &swap, &status)?;
 
 			if !status.swapped.is_zero() {
 				SwapDone::<T>::for_redemption(

pallets/foreign-investments/src/lib.rs

@@ -101,7 +101,7 @@ pub mod pallet {
 	};
 	use cfg_types::investments::{ExecutedForeignCollect, ExecutedForeignDecreaseInvest};
 	use frame_support::pallet_prelude::*;
-	use sp_runtime::traits::AtLeast32BitUnsigned;
+	use sp_runtime::traits::{AtLeast32BitUnsigned, One};
 
 	use super::*;
 
@@ -116,6 +116,8 @@ pub mod pallet {
 	/// depends.
 	#[pallet::config]
 	pub trait Config: frame_system::Config {
+		type RuntimeEvent: From<Event<Self>> + IsType<<Self as frame_system::Config>::RuntimeEvent>;
+
 		/// Represents a foreign amount
 		type ForeignBalance: Parameter
 			+ Member
@@ -149,6 +151,9 @@ pub mod pallet {
 		/// Any balances used in TokenSwaps
 		type SwapBalance: Parameter + Member + AtLeast32BitUnsigned + Default + Copy + MaxEncodedLen;
 
+		/// Ratio used for swapping amounts
+		type SwapRatio: Parameter + Member + Copy + MaxEncodedLen + One;
+
 		/// The currency type of transferrable tokens
 		type CurrencyId: Parameter + Member + Copy + MaxEncodedLen;
 
@@ -263,4 +268,31 @@ pub mod pallet {
 		/// The decrease is greater than the current investment/redemption
 		TooMuchDecrease,
 	}
+
+	#[pallet::event]
+	#[pallet::generate_deposit(pub(super) fn deposit_event)]
+	pub enum Event<T: Config> {
+		// The swap is created and now is wating to be fulfilled
+		SwapCreated {
+			who: T::AccountId,
+			swap_id: SwapId<T>,
+			swap: SwapOf<T>,
+		},
+		// The swap was fulfilled by another participant.
+		SwapFullfilled {
+			who: T::AccountId,
+			swap_id: SwapId<T>,
+			remaining: SwapOf<T>,
+			swapped_in: T::SwapBalance,
+			swapped_out: T::SwapBalance,
+		},
+		// The swap was fulfilled by cancelling an opposite swap for the same foreign investment.
+		SwapCancelled {
+			who: T::AccountId,
+			swap_id: SwapId<T>,
+			remaining: SwapOf<T>,
+			cancelled_in: T::SwapBalance,
+			opposite_in: T::SwapBalance,
+		},
+	}
 }

pallets/foreign-investments/src/mock.rs

@@ -148,7 +148,9 @@ impl pallet_foreign_investments::Config for Runtime {
 	type InvestmentId = InvestmentId;
 	type PoolBalance = Balance;
 	type PoolInspect = MockPools;
+	type RuntimeEvent = RuntimeEvent;
 	type SwapBalance = Balance;
+	type SwapRatio = Ratio;
 	type Swaps = Swaps;
 	type TrancheBalance = Balance;
 }
@@ -158,5 +160,7 @@ pub fn new_test_ext() -> sp_io::TestExternalities {
 		.build_storage::<Runtime>()
 		.unwrap();
 
-	sp_io::TestExternalities::new(storage)
+	let mut ext = sp_io::TestExternalities::new(storage);
+	ext.execute_with(|| frame_system::Pallet::<Runtime>::set_block_number(1));
+	ext
 }

pallets/foreign-investments/src/tests.rs

@@ -1,12 +1,13 @@
 use cfg_traits::{
 	investments::{ForeignInvestment as _, Investment, TrancheCurrency},
-	swaps::{OrderInfo, OrderRatio, Swap, SwapState, TokenSwaps},
+	swaps::{OrderInfo, OrderRatio, Swap, SwapInfo, TokenSwaps},
 	StatusNotificationHook,
 };
 use cfg_types::investments::{
 	CollectedAmount, ExecutedForeignCollect, ExecutedForeignDecreaseInvest,
 };
 use frame_support::{assert_err, assert_ok};
+use sp_runtime::traits::One;
 use sp_std::sync::{Arc, Mutex};
 
 use crate::{
@@ -57,6 +58,14 @@ mod util {
 		}
 	}
 
+	pub fn market_ratio(to: CurrencyId, from: CurrencyId) -> Ratio {
+		match (from, to) {
+			(POOL_CURR, FOREIGN_CURR) => Ratio::from_rational(1, STABLE_RATIO),
+			(FOREIGN_CURR, POOL_CURR) => Ratio::from_rational(STABLE_RATIO, 1),
+			_ => Ratio::one(),
+		}
+	}
+
 	pub fn configure_pool() {
 		MockPools::mock_currency_for(|pool_id| {
 			assert_eq!(pool_id, INVESTMENT_ID.of_pool());
@@ -105,6 +114,8 @@ mod util {
 		MockTokenSwaps::mock_convert_by_market(|to, from, amount_from| {
 			Ok(convert_currencies(to, from, amount_from))
 		});
+
+		MockTokenSwaps::mock_market_ratio(|to, from| Ok(util::market_ratio(to, from)));
 	}
 
 	// Setup basic investment system
@@ -146,7 +157,7 @@ mod util {
 
 		Swaps::notify_status_change(
 			order_id,
-			SwapState {
+			SwapInfo {
 				remaining: Swap {
 					amount_out: order.swap.amount_out - amount_out,
 					..order.swap
@@ -158,6 +169,7 @@ mod util {
 				)
 				.unwrap(),
 				swapped_out: amount_out,
+				ratio: util::market_ratio(order.swap.currency_in, order.swap.currency_out),
 			},
 		)
 		.unwrap();
@@ -225,6 +237,19 @@ mod investment {
 				Ok(AMOUNT)
 			);
 			assert_eq!(MockInvestment::investment(&USER, INVESTMENT_ID), Ok(0));
+
+			System::assert_has_event(
+				Event::SwapCreated {
+					who: USER,
+					swap_id: (INVESTMENT_ID, Action::Investment),
+					swap: Swap {
+						amount_out: AMOUNT,
+						currency_out: FOREIGN_CURR,
+						currency_in: POOL_CURR,
+					},
+				}
+				.into(),
+			);
 		});
 	}
 
@@ -351,6 +376,21 @@ mod investment {
 				Ok(AMOUNT * 3 / 4)
 			);
 			assert_eq!(MockInvestment::investment(&USER, INVESTMENT_ID), Ok(0));
+
+			System::assert_has_event(
+				Event::SwapCancelled {
+					who: USER,
+					swap_id: (INVESTMENT_ID, Action::Investment),
+					remaining: Swap {
+						amount_out: 0,
+						currency_out: POOL_CURR,
+						currency_in: FOREIGN_CURR,
+					},
+					cancelled_in: AMOUNT / 4,
+					opposite_in: 3 * AMOUNT / 4,
+				}
+				.into(),
+			);
 		});
 	}
 
@@ -409,6 +449,21 @@ mod investment {
 				MockInvestment::investment(&USER, INVESTMENT_ID),
 				Ok(foreign_to_pool(AMOUNT / 4))
 			);
+
+			System::assert_has_event(
+				Event::SwapFullfilled {
+					who: USER,
+					swap_id: (INVESTMENT_ID, Action::Investment),
+					remaining: Swap {
+						amount_out: 3 * AMOUNT / 4,
+						currency_out: FOREIGN_CURR,
+						currency_in: POOL_CURR,
+					},
+					swapped_in: foreign_to_pool(AMOUNT / 4),
+					swapped_out: AMOUNT / 4,
+				}
+				.into(),
+			);
 		});
 	}