diff --git a/polkadot/runtime/westend/src/lib.rs b/polkadot/runtime/westend/src/lib.rs index 03ecd5c070b2..de961bb4c398 100644 --- a/polkadot/runtime/westend/src/lib.rs +++ b/polkadot/runtime/westend/src/lib.rs @@ -2250,6 +2250,10 @@ sp_api::impl_runtime_apis! { fn eras_stakers_page_count(era: sp_staking::EraIndex, account: AccountId) -> sp_staking::Page { Staking::api_eras_stakers_page_count(era, account) } + + fn pending_rewards(era: sp_staking::EraIndex, account: AccountId) -> bool { + Staking::api_pending_rewards(era, account) + } } #[cfg(feature = "try-runtime")] diff --git a/prdoc/pr_4301.prdoc b/prdoc/pr_4301.prdoc new file mode 100644 index 000000000000..2ca2534243a8 --- /dev/null +++ b/prdoc/pr_4301.prdoc @@ -0,0 +1,13 @@ +title: New runtime api to check if a validator has pending pages of rewards for an era. + +doc: + - audience: + - Node Dev + - Runtime User + description: | + Creates a new runtime api to check if reward for an era is pending for a validator. Era rewards are paged and this + api will return true as long as there is one or more pages of era reward which are not claimed. + +crates: +- name: pallet-staking +- name: pallet-staking-runtime-api diff --git a/substrate/bin/node/runtime/src/lib.rs b/substrate/bin/node/runtime/src/lib.rs index 0caaa8c73226..5d8016532a5d 100644 --- a/substrate/bin/node/runtime/src/lib.rs +++ b/substrate/bin/node/runtime/src/lib.rs @@ -2791,6 +2791,10 @@ impl_runtime_apis! { fn eras_stakers_page_count(era: sp_staking::EraIndex, account: AccountId) -> sp_staking::Page { Staking::api_eras_stakers_page_count(era, account) } + + fn pending_rewards(era: sp_staking::EraIndex, account: AccountId) -> bool { + Staking::api_pending_rewards(era, account) + } } impl sp_consensus_babe::BabeApi for Runtime { diff --git a/substrate/frame/staking/runtime-api/src/lib.rs b/substrate/frame/staking/runtime-api/src/lib.rs index b04c383a077d..7955f4184a43 100644 --- a/substrate/frame/staking/runtime-api/src/lib.rs +++ b/substrate/frame/staking/runtime-api/src/lib.rs @@ -30,7 +30,10 @@ sp_api::decl_runtime_apis! { /// Returns the nominations quota for a nominator with a given balance. fn nominations_quota(balance: Balance) -> u32; - /// Returns the page count of exposures for a validator in a given era. + /// Returns the page count of exposures for a validator `account` in a given era. fn eras_stakers_page_count(era: sp_staking::EraIndex, account: AccountId) -> sp_staking::Page; + + /// Returns true if validator `account` has pages to be claimed for the given era. + fn pending_rewards(era: sp_staking::EraIndex, account: AccountId) -> bool; } } diff --git a/substrate/frame/staking/src/lib.rs b/substrate/frame/staking/src/lib.rs index 047ad6b87cc1..692e62acfdff 100644 --- a/substrate/frame/staking/src/lib.rs +++ b/substrate/frame/staking/src/lib.rs @@ -1035,11 +1035,37 @@ where /// can and add more functions to it as needed. pub struct EraInfo(sp_std::marker::PhantomData); impl EraInfo { + /// Returns true if validator has one or more page of era rewards not claimed yet. + // Also looks at legacy storage that can be cleaned up after #433. + pub fn pending_rewards(era: EraIndex, validator: &T::AccountId) -> bool { + let page_count = if let Some(overview) = >::get(&era, validator) { + overview.page_count + } else { + if >::contains_key(era, validator) { + // this means non paged exposure, and we treat them as single paged. + 1 + } else { + // if no exposure, then no rewards to claim. + return false + } + }; + + // check if era is marked claimed in legacy storage. + if >::get(validator) + .map(|l| l.legacy_claimed_rewards.contains(&era)) + .unwrap_or_default() + { + return false + } + + ClaimedRewards::::get(era, validator).len() < page_count as usize + } + /// Temporary function which looks at both (1) passed param `T::StakingLedger` for legacy /// non-paged rewards, and (2) `T::ClaimedRewards` for paged rewards. This function can be /// removed once `T::HistoryDepth` eras have passed and none of the older non-paged rewards /// are relevant/claimable. - // Refer tracker issue for cleanup: #13034 + // Refer tracker issue for cleanup: https://github.com/paritytech/polkadot-sdk/issues/433 pub(crate) fn is_rewards_claimed_with_legacy_fallback( era: EraIndex, ledger: &StakingLedger, diff --git a/substrate/frame/staking/src/pallet/impls.rs b/substrate/frame/staking/src/pallet/impls.rs index f4d4a7133dd5..4eb24311ab34 100644 --- a/substrate/frame/staking/src/pallet/impls.rs +++ b/substrate/frame/staking/src/pallet/impls.rs @@ -1183,6 +1183,10 @@ impl Pallet { pub fn api_eras_stakers_page_count(era: EraIndex, account: T::AccountId) -> Page { EraInfo::::get_page_count(era, &account) } + + pub fn api_pending_rewards(era: EraIndex, account: T::AccountId) -> bool { + EraInfo::::pending_rewards(era, &account) + } } impl ElectionDataProvider for Pallet { diff --git a/substrate/frame/staking/src/tests.rs b/substrate/frame/staking/src/tests.rs index 6cf5a56e5a6d..d05752f54be7 100644 --- a/substrate/frame/staking/src/tests.rs +++ b/substrate/frame/staking/src/tests.rs @@ -6796,6 +6796,113 @@ fn test_validator_exposure_is_backward_compatible_with_non_paged_rewards_payout( }); } +#[test] +fn test_runtime_api_pending_rewards() { + ExtBuilder::default().build_and_execute(|| { + // GIVEN + let err_weight = ::WeightInfo::payout_stakers_alive_staked(0); + let stake = 100; + + // validator with non-paged exposure, rewards marked in legacy claimed rewards. + let validator_one = 301; + // validator with non-paged exposure, rewards marked in paged claimed rewards. + let validator_two = 302; + // validator with paged exposure. + let validator_three = 303; + + // Set staker + for v in validator_one..=validator_three { + let _ = Balances::make_free_balance_be(&v, stake); + assert_ok!(Staking::bond(RuntimeOrigin::signed(v), stake, RewardDestination::Staked)); + } + + // Add reward points + let reward = EraRewardPoints:: { + total: 1, + individual: vec![(validator_one, 1), (validator_two, 1), (validator_three, 1)] + .into_iter() + .collect(), + }; + ErasRewardPoints::::insert(0, reward); + + // build exposure + let mut individual_exposures: Vec> = vec![]; + for i in 0..=MaxExposurePageSize::get() { + individual_exposures.push(IndividualExposure { who: i.into(), value: stake }); + } + let exposure = Exposure:: { + total: stake * (MaxExposurePageSize::get() as Balance + 2), + own: stake, + others: individual_exposures, + }; + + // add non-paged exposure for one and two. + >::insert(0, validator_one, exposure.clone()); + >::insert(0, validator_two, exposure.clone()); + // add paged exposure for third validator + EraInfo::::set_exposure(0, &validator_three, exposure); + + // add some reward to be distributed + ErasValidatorReward::::insert(0, 1000); + + // mark rewards claimed for validator_one in legacy claimed rewards + >::insert( + validator_one, + StakingLedgerInspect { + stash: validator_one, + total: stake, + active: stake, + unlocking: Default::default(), + legacy_claimed_rewards: bounded_vec![0], + }, + ); + + // SCENARIO ONE: rewards already marked claimed in legacy storage. + // runtime api should return false for pending rewards for validator_one. + assert!(!EraInfo::::pending_rewards(0, &validator_one)); + // and if we try to pay, we get an error. + assert_noop!( + Staking::payout_stakers(RuntimeOrigin::signed(1337), validator_one, 0), + Error::::AlreadyClaimed.with_weight(err_weight) + ); + + // SCENARIO TWO: non-paged exposure + // validator two has not claimed rewards, so pending rewards is true. + assert!(EraInfo::::pending_rewards(0, &validator_two)); + // and payout works + assert_ok!(Staking::payout_stakers(RuntimeOrigin::signed(1337), validator_two, 0)); + // now pending rewards is false. + assert!(!EraInfo::::pending_rewards(0, &validator_two)); + // and payout fails + assert_noop!( + Staking::payout_stakers(RuntimeOrigin::signed(1337), validator_two, 0), + Error::::AlreadyClaimed.with_weight(err_weight) + ); + + // SCENARIO THREE: validator with paged exposure (two pages). + // validator three has not claimed rewards, so pending rewards is true. + assert!(EraInfo::::pending_rewards(0, &validator_three)); + // and payout works + assert_ok!(Staking::payout_stakers(RuntimeOrigin::signed(1337), validator_three, 0)); + // validator three has two pages of exposure, so pending rewards is still true. + assert!(EraInfo::::pending_rewards(0, &validator_three)); + // payout again + assert_ok!(Staking::payout_stakers(RuntimeOrigin::signed(1337), validator_three, 0)); + // now pending rewards is false. + assert!(!EraInfo::::pending_rewards(0, &validator_three)); + // and payout fails + assert_noop!( + Staking::payout_stakers(RuntimeOrigin::signed(1337), validator_three, 0), + Error::::AlreadyClaimed.with_weight(err_weight) + ); + + // for eras with no exposure, pending rewards is false. + assert!(!EraInfo::::pending_rewards(0, &validator_one)); + assert!(!EraInfo::::pending_rewards(0, &validator_two)); + assert!(!EraInfo::::pending_rewards(0, &validator_three)); + }); +} + mod staking_interface { use frame_support::storage::with_storage_layer; use sp_staking::StakingInterface;