add staking/election related view functions

prdoc/pr_8337.prdoc

@@ -0,0 +1,12 @@
+title: add staking/election related view functions
+doc:
+- audience: Runtime Dev
+  description: |-
+    Adds two self-explanatory view functions to staking/election related pallets.
+    To be used by wallets wishing to perform rebag operation, and use by staking miner(s) to know
+    how much deposit they need in advance.
+crates:
+- name: pallet-bags-list
+  bump: patch
+- name: pallet-election-provider-multi-block
+  bump: patch

substrate/frame/bags-list/src/lib.rs

@@ -294,6 +294,18 @@ pub mod pallet {
 		}
 	}
 
+	#[pallet::view_functions]
+	impl<T: Config<I>, I: 'static> Pallet<T, I> {
+		/// Get the current `score` of a given account.
+		///
+		/// Returns `(current, real_score)`.
+		///
+		/// If the two differ, it probably means this node is eligible for [`Call::rebag`].
+		pub fn scores(who: T::AccountId) -> (Option<T::Score>, Option<T::Score>) {
+			(ListNodes::<T, I>::get(&who).map(|node| node.score), T::ScoreProvider::score(&who))
+		}
+	}
+
 	#[pallet::call]
 	impl<T: Config<I>, I: 'static> Pallet<T, I> {
 		/// Declare that some `dislocated` account has, through rewards or penalties, sufficiently

substrate/frame/election-provider-multi-block/src/signed/mod.rs

@@ -886,6 +886,17 @@
 		}
 	}
 
+	#[pallet::view_functions]
+	impl<T: Config> Pallet<T> {
+		/// Get the deposit amount that will be held for a solution of `p` pages.
+		///
+		/// This allows an offchain application to know what [`Config::DepositPerPage`] and
+		/// [`Config::DepositBase`] are doing under the hood.
+		pub fn deposit_for(p: u32) -> BalanceOf<T> {
+			Self::deposit_for(p as usize)
+		}
+	}
+
 	#[pallet::hooks]
 	impl<T: Config> Hooks<BlockNumberFor<T>> for Pallet<T> {
 		fn on_initialize(_: BlockNumberFor<T>) -> Weight {