remove pallet::getter from pallet-staking (#6184)

# Description

Part of #3326
Removes all pallet::getter occurrences from pallet-staking and replaces
them with explicit implementations.
Adds tests to verify that retrieval of affected entities works as
expected so via storage::getter.

## Review Notes

1. Traits added to the `derive` attribute are used in tests (either
directly or indirectly).
2. The getters had to be placed in a separate impl block since the other
one is annotated with `#[pallet::call]` and that requires
`#[pallet::call_index(0)]` annotation on each function in that block. So
I thought it's better to separate them.

---------

Co-authored-by: Dónal Murray <donal.murray@parity.io>
Co-authored-by: Guillaume Thiolliere <gui.thiolliere@gmail.com>

polkadot/runtime/westend/src/lib.rs

@@ -543,7 +543,7 @@ impl Get<u32> for MaybeSignedPhase {
 	fn get() -> u32 {
 		// 1 day = 4 eras -> 1 week = 28 eras. We want to disable signed phase once a week to test
 		// the fallback unsigned phase is able to compute elections on Westend.
-		if Staking::current_era().unwrap_or(1) % 28 == 0 {
+		if pallet_staking::CurrentEra::<Runtime>::get().unwrap_or(1) % 28 == 0 {
 			0
 		} else {
 			SignedPhase::get()

prdoc/pr_6184.prdoc

@@ -0,0 +1,24 @@
+title: Remove pallet::getter from pallet-staking
+doc:
+  - audience: Runtime Dev
+    description: |
+      This PR removes all pallet::getter occurrences from pallet-staking and replaces them with explicit implementations.
+      It also adds tests to verify that retrieval of affected entities works as expected so via storage::getter.
+
+crates:
+  - name: pallet-babe
+    bump: patch
+  - name: pallet-beefy
+    bump: patch
+  - name: pallet-election-provider-multi-phase
+    bump: patch
+  - name: pallet-grandpa
+    bump: patch
+  - name: pallet-nomination-pools
+    bump: patch
+  - name: pallet-root-offences
+    bump: patch
+  - name: westend-runtime
+    bump: patch
+  - name: pallet-staking
+    bump: patch

substrate/frame/babe/src/mock.rs

@@ -239,7 +239,7 @@ pub fn start_session(session_index: SessionIndex) {
 /// Progress to the first block at the given era
 pub fn start_era(era_index: EraIndex) {
 	start_session((era_index * 3).into());
-	assert_eq!(Staking::current_era(), Some(era_index));
+	assert_eq!(pallet_staking::CurrentEra::<Test>::get(), Some(era_index));
 }
 
 pub fn make_primary_pre_digest(

substrate/frame/babe/src/tests.rs

@@ -414,7 +414,7 @@ fn disabled_validators_cannot_author_blocks() {
 		// so we should still be able to author blocks
 		start_era(2);
 
-		assert_eq!(Staking::current_era().unwrap(), 2);
+		assert_eq!(pallet_staking::CurrentEra::<Test>::get().unwrap(), 2);
 
 		// let's disable the validator at index 0
 		Session::disable_index(0);

substrate/frame/beefy/src/mock.rs

@@ -366,5 +366,5 @@ pub fn start_session(session_index: SessionIndex) {
 
 pub fn start_era(era_index: EraIndex) {
 	start_session((era_index * 3).into());
-	assert_eq!(Staking::current_era(), Some(era_index));
+	assert_eq!(pallet_staking::CurrentEra::<Test>::get(), Some(era_index));
 }

substrate/frame/beefy/src/tests.rs

@@ -313,7 +313,7 @@ fn report_equivocation_current_set_works(mut f: impl ReportEquivocationFn) {
 	let authorities = test_authorities();
 
 	ExtBuilder::default().add_authorities(authorities).build_and_execute(|| {
-		assert_eq!(Staking::current_era(), Some(0));
+		assert_eq!(pallet_staking::CurrentEra::<Test>::get(), Some(0));
 		assert_eq!(Session::current_index(), 0);
 
 		start_era(1);
@@ -906,7 +906,7 @@ fn report_fork_voting_invalid_context() {
 
 	let mut era = 1;
 	let block_num = ext.execute_with(|| {
-		assert_eq!(Staking::current_era(), Some(0));
+		assert_eq!(pallet_staking::CurrentEra::<Test>::get(), Some(0));
 		assert_eq!(Session::current_index(), 0);
 		start_era(era);
 

substrate/frame/election-provider-multi-phase/test-staking-e2e/src/lib.rs

@@ -47,7 +47,7 @@ fn log_current_time() {
 		"block: {:?}, session: {:?}, era: {:?}, EPM phase: {:?} ts: {:?}",
 		System::block_number(),
 		Session::current_index(),
-		Staking::current_era(),
+		pallet_staking::CurrentEra::<Runtime>::get(),
 		CurrentPhase::<Runtime>::get(),
 		Now::<Runtime>::get()
 	);

substrate/frame/election-provider-multi-phase/test-staking-e2e/src/mock.rs

@@ -49,7 +49,7 @@ use pallet_election_provider_multi_phase::{
 	unsigned::MinerConfig, Call, CurrentPhase, ElectionCompute, GeometricDepositBase,
 	QueuedSolution, SolutionAccuracyOf,
 };
-use pallet_staking::StakerStatus;
+use pallet_staking::{ActiveEra, CurrentEra, ErasStartSessionIndex, StakerStatus};
 use parking_lot::RwLock;
 use std::sync::Arc;
 
@@ -806,11 +806,11 @@ pub(crate) fn start_active_era(
 }
 
 pub(crate) fn active_era() -> EraIndex {
-	Staking::active_era().unwrap().index
+	ActiveEra::<Runtime>::get().unwrap().index
 }
 
 pub(crate) fn current_era() -> EraIndex {
-	Staking::current_era().unwrap()
+	CurrentEra::<Runtime>::get().unwrap()
 }
 
 // Fast forward until EPM signed phase.
@@ -862,11 +862,11 @@ pub(crate) fn on_offence_now(
 	>],
 	slash_fraction: &[Perbill],
 ) {
-	let now = Staking::active_era().unwrap().index;
+	let now = ActiveEra::<Runtime>::get().unwrap().index;
 	let _ = Staking::on_offence(
 		offenders,
 		slash_fraction,
-		Staking::eras_start_session_index(now).unwrap(),
+		ErasStartSessionIndex::<Runtime>::get(now).unwrap(),
 	);
 }
 

substrate/frame/grandpa/src/mock.rs

@@ -297,7 +297,7 @@ pub fn start_session(session_index: SessionIndex) {
 
 pub fn start_era(era_index: EraIndex) {
 	start_session((era_index * 3).into());
-	assert_eq!(Staking::current_era(), Some(era_index));
+	assert_eq!(pallet_staking::CurrentEra::<Test>::get(), Some(era_index));
 }
 
 pub fn initialize_block(number: u64, parent_hash: H256) {

substrate/frame/grandpa/src/tests.rs

@@ -319,7 +319,7 @@ fn report_equivocation_current_set_works() {
 	let authorities = test_authorities();
 
 	new_test_ext_raw_authorities(authorities).execute_with(|| {
-		assert_eq!(Staking::current_era(), Some(0));
+		assert_eq!(pallet_staking::CurrentEra::<Test>::get(), Some(0));
 		assert_eq!(Session::current_index(), 0);
 
 		start_era(1);

substrate/frame/nomination-pools/test-delegate-stake/src/lib.rs

@@ -41,7 +41,7 @@ use sp_staking::Agent;
 fn pool_lifecycle_e2e() {
 	new_test_ext().execute_with(|| {
 		assert_eq!(Balances::minimum_balance(), 5);
-		assert_eq!(Staking::current_era(), None);
+		assert_eq!(CurrentEra::<T>::get(), None);
 
 		// create the pool, we know this has id 1.
 		assert_ok!(Pools::create(RuntimeOrigin::signed(10), 50, 10, 10, 10));
@@ -204,7 +204,7 @@ fn pool_lifecycle_e2e() {
 fn pool_chill_e2e() {
 	new_test_ext().execute_with(|| {
 		assert_eq!(Balances::minimum_balance(), 5);
-		assert_eq!(Staking::current_era(), None);
+		assert_eq!(CurrentEra::<T>::get(), None);
 
 		// create the pool, we know this has id 1.
 		assert_ok!(Pools::create(RuntimeOrigin::signed(10), 50, 10, 10, 10));
@@ -330,7 +330,7 @@ fn pool_slash_e2e() {
 	new_test_ext().execute_with(|| {
 		ExistentialDeposit::set(1);
 		assert_eq!(Balances::minimum_balance(), 1);
-		assert_eq!(Staking::current_era(), None);
+		assert_eq!(CurrentEra::<T>::get(), None);
 
 		// create the pool, we know this has id 1.
 		assert_ok!(Pools::create(RuntimeOrigin::signed(10), 40, 10, 10, 10));
@@ -540,7 +540,7 @@ fn pool_slash_proportional() {
 		ExistentialDeposit::set(1);
 		BondingDuration::set(28);
 		assert_eq!(Balances::minimum_balance(), 1);
-		assert_eq!(Staking::current_era(), None);
+		assert_eq!(CurrentEra::<T>::get(), None);
 
 		// create the pool, we know this has id 1.
 		assert_ok!(Pools::create(RuntimeOrigin::signed(10), 40, 10, 10, 10));
@@ -758,7 +758,7 @@ fn pool_slash_non_proportional_only_bonded_pool() {
 		ExistentialDeposit::set(1);
 		BondingDuration::set(28);
 		assert_eq!(Balances::minimum_balance(), 1);
-		assert_eq!(Staking::current_era(), None);
+		assert_eq!(CurrentEra::<T>::get(), None);
 
 		// create the pool, we know this has id 1.
 		assert_ok!(Pools::create(RuntimeOrigin::signed(10), 40, 10, 10, 10));
@@ -837,7 +837,7 @@ fn pool_slash_non_proportional_bonded_pool_and_chunks() {
 		ExistentialDeposit::set(1);
 		BondingDuration::set(28);
 		assert_eq!(Balances::minimum_balance(), 1);
-		assert_eq!(Staking::current_era(), None);
+		assert_eq!(CurrentEra::<T>::get(), None);
 
 		// create the pool, we know this has id 1.
 		assert_ok!(Pools::create(RuntimeOrigin::signed(10), 40, 10, 10, 10));
@@ -914,7 +914,7 @@ fn pool_migration_e2e() {
 	new_test_ext().execute_with(|| {
 		LegacyAdapter::set(true);
 		assert_eq!(Balances::minimum_balance(), 5);
-		assert_eq!(Staking::current_era(), None);
+		assert_eq!(CurrentEra::<T>::get(), None);
 
 		// create the pool with TransferStake strategy.
 		assert_ok!(Pools::create(RuntimeOrigin::signed(10), 50, 10, 10, 10));
@@ -1192,7 +1192,7 @@ fn disable_pool_operations_on_non_migrated() {
 	new_test_ext().execute_with(|| {
 		LegacyAdapter::set(true);
 		assert_eq!(Balances::minimum_balance(), 5);
-		assert_eq!(Staking::current_era(), None);
+		assert_eq!(CurrentEra::<T>::get(), None);
 
 		// create the pool with TransferStake strategy.
 		assert_ok!(Pools::create(RuntimeOrigin::signed(10), 50, 10, 10, 10));
@@ -1369,7 +1369,7 @@ fn pool_no_dangling_delegation() {
 	new_test_ext().execute_with(|| {
 		ExistentialDeposit::set(1);
 		assert_eq!(Balances::minimum_balance(), 1);
-		assert_eq!(Staking::current_era(), None);
+		assert_eq!(CurrentEra::<T>::get(), None);
 		// pool creator
 		let alice = 10;
 		let bob = 20;

substrate/frame/nomination-pools/test-transfer-stake/src/lib.rs

@@ -34,7 +34,7 @@ use sp_runtime::{bounded_btree_map, traits::Zero};
 fn pool_lifecycle_e2e() {
 	new_test_ext().execute_with(|| {
 		assert_eq!(Balances::minimum_balance(), 5);
-		assert_eq!(Staking::current_era(), None);
+		assert_eq!(CurrentEra::<T>::get(), None);
 
 		// create the pool, we know this has id 1.
 		assert_ok!(Pools::create(RuntimeOrigin::signed(10), 50, 10, 10, 10));
@@ -286,7 +286,7 @@ fn destroy_pool_with_erroneous_consumer() {
 fn pool_chill_e2e() {
 	new_test_ext().execute_with(|| {
 		assert_eq!(Balances::minimum_balance(), 5);
-		assert_eq!(Staking::current_era(), None);
+		assert_eq!(CurrentEra::<T>::get(), None);
 
 		// create the pool, we know this has id 1.
 		assert_ok!(Pools::create(RuntimeOrigin::signed(10), 50, 10, 10, 10));
@@ -412,7 +412,7 @@ fn pool_slash_e2e() {
 	new_test_ext().execute_with(|| {
 		ExistentialDeposit::set(1);
 		assert_eq!(Balances::minimum_balance(), 1);
-		assert_eq!(Staking::current_era(), None);
+		assert_eq!(CurrentEra::<T>::get(), None);
 
 		// create the pool, we know this has id 1.
 		assert_ok!(Pools::create(RuntimeOrigin::signed(10), 40, 10, 10, 10));
@@ -622,7 +622,7 @@ fn pool_slash_proportional() {
 		ExistentialDeposit::set(1);
 		BondingDuration::set(28);
 		assert_eq!(Balances::minimum_balance(), 1);
-		assert_eq!(Staking::current_era(), None);
+		assert_eq!(CurrentEra::<T>::get(), None);
 
 		// create the pool, we know this has id 1.
 		assert_ok!(Pools::create(RuntimeOrigin::signed(10), 40, 10, 10, 10));
@@ -759,7 +759,7 @@ fn pool_slash_non_proportional_only_bonded_pool() {
 		ExistentialDeposit::set(1);
 		BondingDuration::set(28);
 		assert_eq!(Balances::minimum_balance(), 1);
-		assert_eq!(Staking::current_era(), None);
+		assert_eq!(CurrentEra::<T>::get(), None);
 
 		// create the pool, we know this has id 1.
 		assert_ok!(Pools::create(RuntimeOrigin::signed(10), 40, 10, 10, 10));
@@ -838,7 +838,7 @@ fn pool_slash_non_proportional_bonded_pool_and_chunks() {
 		ExistentialDeposit::set(1);
 		BondingDuration::set(28);
 		assert_eq!(Balances::minimum_balance(), 1);
-		assert_eq!(Staking::current_era(), None);
+		assert_eq!(CurrentEra::<T>::get(), None);
 
 		// create the pool, we know this has id 1.
 		assert_ok!(Pools::create(RuntimeOrigin::signed(10), 40, 10, 10, 10));

substrate/frame/root-offences/src/lib.rs

@@ -106,7 +106,7 @@ pub mod pallet {
 		fn get_offence_details(
 			offenders: Vec<(T::AccountId, Perbill)>,
 		) -> Result<Vec<OffenceDetails<T>>, DispatchError> {
-			let now = Staking::<T>::active_era()
+			let now = pallet_staking::ActiveEra::<T>::get()
 				.map(|e| e.index)
 				.ok_or(Error::<T>::FailedToGetActiveEra)?;
 

substrate/frame/root-offences/src/mock.rs

@@ -296,5 +296,5 @@ pub(crate) fn run_to_block(n: BlockNumber) {
 }
 
 pub(crate) fn active_era() -> EraIndex {
-	Staking::active_era().unwrap().index
+	pallet_staking::ActiveEra::<Test>::get().unwrap().index
 }

substrate/frame/staking/src/benchmarking.rs

@@ -708,7 +708,7 @@ mod benchmarks {
 		<ErasValidatorPrefs<T>>::insert(
 			current_era,
 			validator.clone(),
-			<Staking<T>>::validators(&validator),
+			Validators::<T>::get(&validator),
 		);
 
 		let caller = whitelisted_caller();

substrate/frame/staking/src/lib.rs

@@ -996,7 +996,7 @@ impl<T: Config> Convert<T::AccountId, Option<Exposure<T::AccountId, BalanceOf<T>
 	for ExposureOf<T>
 {
 	fn convert(validator: T::AccountId) -> Option<Exposure<T::AccountId, BalanceOf<T>>> {
-		<Pallet<T>>::active_era()
+		ActiveEra::<T>::get()
 			.map(|active_era| <Pallet<T>>::eras_stakers(active_era.index, &validator))
 	}
 }
@@ -1326,7 +1326,7 @@ impl<T: Config, const DISABLING_LIMIT_FACTOR: usize> DisablingStrategy<T>
 			log!(
 				debug,
 				"Won't disable: current_era {:?} > slash_era {:?}",
-				Pallet::<T>::current_era().unwrap_or_default(),
+				CurrentEra::<T>::get().unwrap_or_default(),
 				slash_era
 			);
 			return None

substrate/frame/staking/src/mock.rs

@@ -568,11 +568,11 @@ impl ExtBuilder {
 }
 
 pub(crate) fn active_era() -> EraIndex {
-	Staking::active_era().unwrap().index
+	pallet_staking::ActiveEra::<Test>::get().unwrap().index
 }
 
 pub(crate) fn current_era() -> EraIndex {
-	Staking::current_era().unwrap()
+	pallet_staking::CurrentEra::<Test>::get().unwrap()
 }
 
 pub(crate) fn bond(who: AccountId, val: Balance) {
@@ -663,7 +663,7 @@ pub(crate) fn start_active_era(era_index: EraIndex) {
 
 pub(crate) fn current_total_payout_for_duration(duration: u64) -> Balance {
 	let (payout, _rest) = <Test as Config>::EraPayout::era_payout(
-		Staking::eras_total_stake(active_era()),
+		pallet_staking::ErasTotalStake::<Test>::get(active_era()),
 		pallet_balances::TotalIssuance::<Test>::get(),
 		duration,
 	);
@@ -673,7 +673,7 @@ pub(crate) fn current_total_payout_for_duration(duration: u64) -> Balance {
 
 pub(crate) fn maximum_payout_for_duration(duration: u64) -> Balance {
 	let (payout, rest) = <Test as Config>::EraPayout::era_payout(
-		Staking::eras_total_stake(active_era()),
+		pallet_staking::ErasTotalStake::<Test>::get(active_era()),
 		pallet_balances::TotalIssuance::<Test>::get(),
 		duration,
 	);
@@ -732,11 +732,11 @@ pub(crate) fn on_offence_in_era(
 		}
 	}
 
-	if Staking::active_era().unwrap().index == era {
+	if pallet_staking::ActiveEra::<Test>::get().unwrap().index == era {
 		let _ = Staking::on_offence(
 			offenders,
 			slash_fraction,
-			Staking::eras_start_session_index(era).unwrap(),
+			pallet_staking::ErasStartSessionIndex::<Test>::get(era).unwrap(),
 		);
 	} else {
 		panic!("cannot slash in era {}", era);
@@ -750,7 +750,7 @@ pub(crate) fn on_offence_now(
 	>],
 	slash_fraction: &[Perbill],
 ) {
-	let now = Staking::active_era().unwrap().index;
+	let now = pallet_staking::ActiveEra::<Test>::get().unwrap().index;
 	on_offence_in_era(offenders, slash_fraction, now)
 }
 
@@ -889,10 +889,10 @@ macro_rules! assert_session_era {
 			$session,
 		);
 		assert_eq!(
-			Staking::current_era().unwrap(),
+			CurrentEra::<T>::get().unwrap(),
 			$era,
 			"wrong current era {} != {}",
-			Staking::current_era().unwrap(),
+			CurrentEra::<T>::get().unwrap(),
 			$era,
 		);
 	};