Add lock events to tokens pallet

scripts/run-clippy.sh

@@ -6,7 +6,7 @@ COMMAND=$1
 
 ALLOW_CLIPPY_RULES=(
 	"clippy::identity_op" # this helps the code to be consistant
-	"clippy::blacklisted-name" # TODO: allow them in test only
+	"clippy::disallowed_names" # TODO: allow them in test only
 	"clippy::ptr-arg" # TODO: decide if we want to fix those
 	"clippy::match_single_binding" # TODO: fix those
 )

tokens/src/lib.rs

@@ -345,6 +345,18 @@ pub mod module {
 			currency_id: T::CurrencyId,
 			who: T::AccountId,
 		},
+		/// Some free balance was locked.
+		Locked {
+			currency_id: T::CurrencyId,
+			who: T::AccountId,
+			amount: T::Balance,
+		},
+		/// Some locked balance was freed.
+		Unlocked {
+			currency_id: T::CurrencyId,
+			who: T::AccountId,
+			amount: T::Balance,
+		},
 	}
 
 	/// The total issuance of a token type.
@@ -840,12 +852,18 @@ impl<T: Config> Pallet<T> {
 		who: &T::AccountId,
 		locks: &[BalanceLock<T::Balance>],
 	) -> DispatchResult {
+		// track lock delta
+		let mut total_frozen_prev = Zero::zero();
+		let mut total_frozen_after = Zero::zero();
+
 		// update account data
 		Self::mutate_account(who, currency_id, |account, _| {
+			total_frozen_prev = account.frozen;
 			account.frozen = Zero::zero();
 			for lock in locks.iter() {
 				account.frozen = account.frozen.max(lock.amount);
 			}
+			total_frozen_after = account.frozen;
 		});
 
 		// update locks
@@ -874,6 +892,22 @@ impl<T: Config> Pallet<T> {
 			}
 		}
 
+		if total_frozen_prev < total_frozen_after {
+			let amount = total_frozen_after.saturating_sub(total_frozen_prev);
+			Self::deposit_event(Event::Locked {
+				currency_id,
+				who: who.clone(),
+				amount,
+			});
+		} else if total_frozen_prev > total_frozen_after {
+			let amount = total_frozen_prev.saturating_sub(total_frozen_after);
+			Self::deposit_event(Event::Unlocked {
+				currency_id,
+				who: who.clone(),
+				amount,
+			});
+		}
+
 		Ok(())
 	}
 

tokens/src/tests.rs

@@ -8,6 +8,12 @@ use frame_system::RawOrigin;
 use mock::{Event, *};
 use sp_runtime::{traits::BadOrigin, TokenError};
 
+fn events() -> Vec<Event> {
+	let evt = System::events().into_iter().map(|evt| evt.event).collect::<Vec<_>>();
+	System::reset_events();
+	evt
+}
+
 // *************************************************
 // tests for genesis
 // *************************************************
@@ -990,6 +996,101 @@ fn do_deposit_report_existential_deposit_error() {
 	});
 }
 
+#[test]
+fn emit_events_when_changing_locks() {
+	ExtBuilder::default().build().execute_with(|| {
+		assert_ok!(Tokens::do_deposit(DOT, &ALICE, 100, false, false));
+		assert_ok!(Tokens::do_deposit(BTC, &ALICE, 100, false, false));
+		System::reset_events();
+
+		// Locks: [10/DOT]
+		assert_ok!(Tokens::set_lock(ID_1, DOT, &ALICE, 10));
+		assert!(events().contains(&Event::Tokens(crate::Event::Locked {
+			currency_id: DOT,
+			who: ALICE,
+			amount: 10
+		})));
+
+		// Locks: [15/DOT]
+		assert_ok!(Tokens::set_lock(ID_1, DOT, &ALICE, 15));
+		assert!(events().contains(&Event::Tokens(crate::Event::Locked {
+			currency_id: DOT,
+			who: ALICE,
+			amount: 5
+		})));
+
+		// Locks: [15/DOT, 20/BTC]
+		assert_ok!(Tokens::set_lock(ID_1, BTC, &ALICE, 20));
+		assert!(events().contains(&Event::Tokens(crate::Event::Locked {
+			currency_id: BTC,
+			who: ALICE,
+			amount: 20
+		})));
+
+		// Locks: [15/DOT, 20/BTC, 10/DOT]
+		assert_ok!(Tokens::set_lock(ID_2, DOT, &ALICE, 10));
+		for event in events() {
+			match event {
+				Event::Tokens(crate::Event::Locked { .. }) => assert!(false, "unexpected lock event"),
+				Event::Tokens(crate::Event::Unlocked { .. }) => assert!(false, "unexpected unlock event"),
+				_ => continue,
+			}
+		}
+
+		// Locks: [15/DOT, 20/BTC, 12/DOT]
+		assert_ok!(Tokens::set_lock(ID_2, DOT, &ALICE, 12));
+		for event in events() {
+			match event {
+				Event::Tokens(crate::Event::Locked { .. }) => assert!(false, "unexpected lock event"),
+				Event::Tokens(crate::Event::Unlocked { .. }) => assert!(false, "unexpected unlock event"),
+				_ => continue,
+			}
+		}
+
+		// Locks: [15/DOT, 20/BTC, 10/DOT]
+		assert_ok!(Tokens::set_lock(ID_2, DOT, &ALICE, 10));
+		for event in events() {
+			match event {
+				Event::Tokens(crate::Event::Locked { .. }) => assert!(false, "unexpected lock event"),
+				Event::Tokens(crate::Event::Unlocked { .. }) => assert!(false, "unexpected unlock event"),
+				_ => continue,
+			}
+		}
+
+		// Locks: [15/DOT, 20/BTC, 20/DOT]
+		assert_ok!(Tokens::set_lock(ID_2, DOT, &ALICE, 20));
+		assert!(events().contains(&Event::Tokens(crate::Event::Locked {
+			currency_id: DOT,
+			who: ALICE,
+			amount: 5
+		})));
+
+		// Locks: [15/DOT, 20/BTC, 16/DOT]
+		assert_ok!(Tokens::set_lock(ID_2, DOT, &ALICE, 16));
+		assert!(events().contains(&Event::Tokens(crate::Event::Unlocked {
+			currency_id: DOT,
+			who: ALICE,
+			amount: 4
+		})));
+
+		// Locks: [15/DOT, 12/BTC, 16/DOT]
+		assert_ok!(Tokens::set_lock(ID_1, BTC, &ALICE, 12));
+		assert!(events().contains(&Event::Tokens(crate::Event::Unlocked {
+			currency_id: BTC,
+			who: ALICE,
+			amount: 8
+		})));
+
+		// Locks: [15/DOT, 12/BTC]
+		assert_ok!(Tokens::remove_lock(ID_2, DOT, &ALICE));
+		assert!(events().contains(&Event::Tokens(crate::Event::Unlocked {
+			currency_id: DOT,
+			who: ALICE,
+			amount: 1
+		})));
+	});
+}
+
 // *************************************************
 // tests for endowed account and remove account
 // *************************************************