precompile for liquid-crowdloan

modules/liquid-crowdloan/src/lib.rs

@@ -76,7 +76,7 @@ pub mod module {
 	}
 
 	#[pallet::event]
-	#[pallet::generate_deposit(fn deposit_event)]
+	#[pallet::generate_deposit(pub(crate) fn deposit_event)]
 	pub enum Event<T: Config> {
 		/// Liquid Crowdloan asset was redeemed.
 		Redeemed { currency_id: CurrencyId, amount: Balance },
@@ -100,33 +100,7 @@ pub mod module {
 		pub fn redeem(origin: OriginFor<T>, #[pallet::compact] amount: Balance) -> DispatchResult {
 			let who = ensure_signed(origin)?;
 
-			let (currency_id, redeem_amount) = if let Some(redeem_currency_id) = RedeemCurrencyId::<T>::get() {
-				// redeem the RedeemCurrencyId
-				// amount_pect = amount / lcdot_total_supply
-				// amount_redeem = amount_pect * redeem_currency_balance
-
-				let redeem_currency_balance = T::Currency::free_balance(redeem_currency_id, &Self::account_id());
-				let lcdot_total_supply = T::Currency::total_issuance(T::LiquidCrowdloanCurrencyId::get());
-
-				let amount_redeem = amount
-					.checked_mul(redeem_currency_balance)
-					.and_then(|x| x.checked_div(lcdot_total_supply))
-					.ok_or(ArithmeticError::Overflow)?;
-
-				(redeem_currency_id, amount_redeem)
-			} else {
-				// redeem DOT
-				let currency_id = T::RelayChainCurrencyId::get();
-				(currency_id, amount)
-			};
-
-			T::Currency::withdraw(T::LiquidCrowdloanCurrencyId::get(), &who, amount)?;
-			T::Currency::transfer(currency_id, &Self::account_id(), &who, redeem_amount)?;
-
-			Self::deposit_event(Event::Redeemed {
-				currency_id,
-				amount: redeem_amount,
-			});
+			Self::do_redeem(&who, amount)?;
 
 			Ok(())
 		}
@@ -175,4 +149,40 @@ impl<T: Config> Pallet<T> {
 	pub fn account_id() -> T::AccountId {
 		T::PalletId::get().into_account_truncating()
 	}
+
+	pub fn do_redeem(who: &T::AccountId, amount: Balance) -> Result<Balance, DispatchError> {
+		let (currency_id, redeem_amount) = if let Some(redeem_currency_id) = RedeemCurrencyId::<T>::get() {
+			// redeem the RedeemCurrencyId
+			// amount_pect = amount / lcdot_total_supply
+			// amount_redeem = amount_pect * redeem_currency_balance
+
+			let redeem_currency_balance = T::Currency::free_balance(redeem_currency_id, &Self::account_id());
+			let lcdot_total_supply = T::Currency::total_issuance(T::LiquidCrowdloanCurrencyId::get());
+
+			let amount_redeem = amount
+				.checked_mul(redeem_currency_balance)
+				.and_then(|x| x.checked_div(lcdot_total_supply))
+				.ok_or(ArithmeticError::Overflow)?;
+
+			(redeem_currency_id, amount_redeem)
+		} else {
+			// redeem DOT
+			let currency_id = T::RelayChainCurrencyId::get();
+			(currency_id, amount)
+		};
+
+		T::Currency::withdraw(T::LiquidCrowdloanCurrencyId::get(), &who, amount)?;
+		T::Currency::transfer(currency_id, &Self::account_id(), &who, redeem_amount)?;
+
+		Self::deposit_event(Event::Redeemed {
+			currency_id,
+			amount: redeem_amount,
+		});
+
+		Ok(redeem_amount)
+	}
+
+	pub fn redeem_currency() -> CurrencyId {
+		RedeemCurrencyId::<T>::get().unwrap_or_else(|| T::RelayChainCurrencyId::get())
+	}
 }

runtime/common/Cargo.toml

@@ -67,6 +67,7 @@ module-cdp-engine = { path = "../../modules/cdp-engine", default-features = fals
 module-cdp-treasury = { path = "../../modules/cdp-treasury", default-features = false, optional = true }
 module-incentives = { path = "../../modules/incentives", default-features = false }
 module-transaction-pause = { path = "../../modules/transaction-pause", default-features = false }
+module-liquid-crowdloan = { path = "../../modules/liquid-crowdloan", default-features = false }
 
 # orml
 orml-oracle = { path = "../../orml/oracle", default-features = false }
@@ -142,6 +143,7 @@ std = [
 	"module-support/std",
 	"module-transaction-pause/std",
 	"module-transaction-payment/std",
+	"module-liquid-crowdloan/std",
 	"primitives/std",
 
 	"nutsfinance-stable-asset/std",