Redesign fee market payment (#169)

* Add basic solution

* Refactor Slash Report

* Refactor Slash Report 2

* Add other changes

* Add tests

* Self review

* Rename to `message_and_confirm_reward`

* Rename to `previous_relayers`

* Rename to AssignedRelayer

* Add more comments

* Add more comments

* Add new reward implementation

* Rename and clean the code, needs more test

* Add more docs here

* Prepare for tests

* Fix broken tests

* Refactor

* Rename

* Remove RewardBook

* Self review

* Save one storage

* Try fix ci

modules/fee-market/src/lib.rs

@@ -77,16 +77,18 @@ pub mod pallet {
 
 		/// Reward parameters
 		#[pallet::constant]
-		type AssignedRelayersRewardRatio: Get<Permill>;
+		type GuardRelayersRewardRatio: Get<Permill>;
 		#[pallet::constant]
 		type MessageRelayersRewardRatio: Get<Permill>;
 		#[pallet::constant]
 		type ConfirmRelayersRewardRatio: Get<Permill>;
 
-		/// The slash rule
+		/// The slash ratio for assigned relayers.
+		#[pallet::constant]
+		type AssignedRelayerSlashRatio: Get<Permill>;
 		type Slasher: Slasher<Self, I>;
-		type Currency: LockableCurrency<Self::AccountId, Moment = Self::BlockNumber>;
 
+		type Currency: LockableCurrency<Self::AccountId, Moment = Self::BlockNumber>;
 		type Event: From<Event<Self, I>> + IsType<<Self as frame_system::Config>::Event>;
 		type WeightInfo: WeightInfo;
 	}
@@ -474,7 +476,8 @@ impl<T: Config<I>, I: 'static> Pallet<T, I> {
 		let mut count = 0u32;
 		let mut orders_locked_collateral = BalanceOf::<T, I>::zero();
 		for (_, order) in <Orders<T, I>>::iter() {
-			if order.relayers_slice().iter().any(|r| r.id == *who) && !order.is_confirmed() {
+			if order.assigned_relayers_slice().iter().any(|r| r.id == *who) && !order.is_confirmed()
+			{
 				count += 1;
 				orders_locked_collateral =
 					orders_locked_collateral.saturating_add(order.locked_collateral);
@@ -504,6 +507,10 @@ impl<T: Config<I>, I: 'static> Pallet<T, I> {
 	}
 }
 
+/// The assigned relayers slash trait
 pub trait Slasher<T: Config<I>, I: 'static> {
-	fn slash(locked_collateral: BalanceOf<T, I>, timeout: T::BlockNumber) -> BalanceOf<T, I>;
+	fn cal_slash_amount(
+		collateral_per_order: BalanceOf<T, I>,
+		timeout: T::BlockNumber,
+	) -> BalanceOf<T, I>;
 }