Implements partial inflation minting to treasury

polkadot/runtime/kusama/src/lib.rs

@@ -694,6 +694,7 @@ impl pallet_staking::Config for Runtime {
 	type AdminOrigin = EitherOf<EnsureRoot<Self::AccountId>, StakingAdmin>;
 	type SessionInterface = Self;
 	type EraPayout = EraPayout;
+	type TreasuryPalletId = TreasuryPalletId;
 	type NextNewSession = Session;
 	type MaxNominatorRewardedPerValidator = MaxNominatorRewardedPerValidator;
 	type OffendingValidatorsThreshold = OffendingValidatorsThreshold;

polkadot/runtime/kusama/src/weights/pallet_staking.rs

@@ -793,4 +793,15 @@ impl<T: frame_system::Config> pallet_staking::WeightInfo for WeightInfo<T> {
 			.saturating_add(Weight::from_parts(0, 0))
 			.saturating_add(T::DbWeight::get().writes(1))
 	}
+	/// Storage: Staking TreasuryInflationTreasury (r:0 w:1)
+	/// Proof: Staking TreasuryInflationTreasury (max_values: Some(1), max_size: Some(4), added: 499, mode: MaxEncodedLen)
+	fn set_treasury_fraction() -> Weight {
+		// Proof Size summary in bytes:
+		//  Measured:  `0`
+		//  Estimated: `0`
+		// Minimum execution time: 3_415_000 picoseconds.
+		Weight::from_parts(3_315_000, 0)
+			.saturating_add(T::DbWeight::get().writes(1_u64))
+	}
+
 }

polkadot/runtime/polkadot/src/lib.rs

@@ -580,6 +580,7 @@ impl pallet_staking::Config for Runtime {
 	type AdminOrigin = EitherOf<EnsureRoot<Self::AccountId>, StakingAdmin>;
 	type SessionInterface = Self;
 	type EraPayout = EraPayout;
+	type TreasuryPalletId = TreasuryPalletId;
 	type MaxNominatorRewardedPerValidator = MaxNominatorRewardedPerValidator;
 	type OffendingValidatorsThreshold = OffendingValidatorsThreshold;
 	type NextNewSession = Session;

polkadot/runtime/polkadot/src/weights/pallet_staking.rs

@@ -793,4 +793,14 @@ impl<T: frame_system::Config> pallet_staking::WeightInfo for WeightInfo<T> {
 			.saturating_add(Weight::from_parts(0, 0))
 			.saturating_add(T::DbWeight::get().writes(1))
 	}
+	/// Storage: Staking TreasuryInflationTreasury (r:0 w:1)
+	/// Proof: Staking TreasuryInflationTreasury (max_values: Some(1), max_size: Some(4), added: 499, mode: MaxEncodedLen)
+	fn set_treasury_fraction() -> Weight {
+		// Proof Size summary in bytes:
+		//  Measured:  `0`
+		//  Estimated: `0`
+		// Minimum execution time: 3_415_000 picoseconds.
+		Weight::from_parts(3_175_000, 0)
+			.saturating_add(T::DbWeight::get().writes(1_u64))
+	}
 }

polkadot/runtime/test-runtime/src/lib.rs

@@ -44,6 +44,7 @@ use frame_election_provider_support::{
 use frame_support::{
 	construct_runtime, parameter_types,
 	traits::{Everything, KeyOwnerProofSystem, WithdrawReasons},
+	PalletId,
 };
 use pallet_grandpa::{fg_primitives, AuthorityId as GrandpaId};
 use pallet_session::historical as session_historical;
@@ -321,6 +322,7 @@ parameter_types! {
 	pub const OnChainMaxWinners: u32 = u32::MAX;
 	// Unbounded number of election targets and voters.
 	pub ElectionBoundsOnChain: ElectionBounds = ElectionBoundsBuilder::default().build();
+	pub const BurnAccountId: PalletId = PalletId(*b"burnburn");
 }
 
 pub struct OnChainSeqPhragmen;
@@ -351,6 +353,7 @@ impl pallet_staking::Config for Runtime {
 	type AdminOrigin = frame_system::EnsureNever<()>;
 	type SessionInterface = Self;
 	type EraPayout = pallet_staking::ConvertCurve<RewardCurve>;
+	type TreasuryPalletId = BurnAccountId; // burn inflation if treasury fraction > 0.
 	type MaxNominatorRewardedPerValidator = MaxNominatorRewardedPerValidator;
 	type OffendingValidatorsThreshold = OffendingValidatorsThreshold;
 	type NextNewSession = Session;

polkadot/runtime/westend/src/lib.rs

@@ -619,6 +619,7 @@ parameter_types! {
 	pub const MaxNominatorRewardedPerValidator: u32 = 64;
 	pub const OffendingValidatorsThreshold: Perbill = Perbill::from_percent(17);
 	pub const MaxNominations: u32 = <NposCompactSolution16 as frame_election_provider_support::NposSolution>::LIMIT as u32;
+	pub const BurnAccountId: PalletId = PalletId(*b"burnburn");
 }
 
 impl pallet_staking::Config for Runtime {
@@ -636,6 +637,7 @@ impl pallet_staking::Config for Runtime {
 	type AdminOrigin = EnsureRoot<AccountId>;
 	type SessionInterface = Self;
 	type EraPayout = pallet_staking::ConvertCurve<RewardCurve>;
+	type TreasuryPalletId = BurnAccountId; // burn inflation if treasury fraction > 0.
 	type MaxNominatorRewardedPerValidator = MaxNominatorRewardedPerValidator;
 	type OffendingValidatorsThreshold = OffendingValidatorsThreshold;
 	type NextNewSession = Session;

polkadot/runtime/westend/src/weights/pallet_staking.rs

@@ -793,4 +793,14 @@ impl<T: frame_system::Config> pallet_staking::WeightInfo for WeightInfo<T> {
 			.saturating_add(Weight::from_parts(0, 0))
 			.saturating_add(T::DbWeight::get().writes(1))
 	}
+	/// Storage: Staking TreasuryInflationTreasury (r:0 w:1)
+	/// Proof: Staking TreasuryInflationTreasury (max_values: Some(1), max_size: Some(4), added: 499, mode: MaxEncodedLen)
+	fn set_treasury_fraction() -> Weight {
+		// Proof Size summary in bytes:
+		//  Measured:  `0`
+		//  Estimated: `0`
+		// Minimum execution time: 3_415_000 picoseconds.
+		Weight::from_parts(3_488_000, 0)
+			.saturating_add(T::DbWeight::get().writes(1_u64))
+	}
 }

substrate/bin/node/runtime/src/lib.rs

@@ -653,6 +653,7 @@ impl pallet_staking::Config for Runtime {
 	>;
 	type SessionInterface = Self;
 	type EraPayout = pallet_staking::ConvertCurve<RewardCurve>;
+	type TreasuryPalletId = TreasuryPalletId;
 	type NextNewSession = Session;
 	type MaxNominatorRewardedPerValidator = MaxNominatorRewardedPerValidator;
 	type OffendingValidatorsThreshold = OffendingValidatorsThreshold;

substrate/frame/babe/src/mock.rs

@@ -166,6 +166,7 @@ parameter_types! {
 	pub const RewardCurve: &'static PiecewiseLinear<'static> = &REWARD_CURVE;
 	pub const OffendingValidatorsThreshold: Perbill = Perbill::from_percent(16);
 	pub static ElectionsBounds: ElectionBounds = ElectionBoundsBuilder::default().build();
+	pub const BurnAccountId: frame_support::PalletId = frame_support::PalletId(*b"burnburn");
 }
 
 pub struct OnChainSeqPhragmen;
@@ -193,6 +194,7 @@ impl pallet_staking::Config for Test {
 	type SessionInterface = Self;
 	type UnixTime = pallet_timestamp::Pallet<Test>;
 	type EraPayout = pallet_staking::ConvertCurve<RewardCurve>;
+	type TreasuryPalletId = BurnAccountId; // burn inflation if treasury fraction > 0.
 	type MaxNominatorRewardedPerValidator = ConstU32<64>;
 	type OffendingValidatorsThreshold = OffendingValidatorsThreshold;
 	type NextNewSession = Session;

substrate/frame/beefy/src/mock.rs

@@ -188,6 +188,7 @@ parameter_types! {
 	pub const RewardCurve: &'static PiecewiseLinear<'static> = &REWARD_CURVE;
 	pub const OffendingValidatorsThreshold: Perbill = Perbill::from_percent(17);
 	pub static ElectionsBoundsOnChain: ElectionBounds = ElectionBoundsBuilder::default().build();
+	pub const BurnAccountId: frame_support::PalletId = frame_support::PalletId(*b"burnburn");
 }
 
 pub struct OnChainSeqPhragmen;
@@ -215,6 +216,7 @@ impl pallet_staking::Config for Test {
 	type SessionInterface = Self;
 	type UnixTime = pallet_timestamp::Pallet<Test>;
 	type EraPayout = pallet_staking::ConvertCurve<RewardCurve>;
+	type TreasuryPalletId = BurnAccountId; // burn inflation if treasury fraction > 0.
 	type MaxNominatorRewardedPerValidator = ConstU32<64>;
 	type OffendingValidatorsThreshold = OffendingValidatorsThreshold;
 	type NextNewSession = Session;

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

@@ -242,6 +242,7 @@ parameter_types! {
 	pub const MaxNominatorRewardedPerValidator: u32 = 256;
 	pub const OffendingValidatorsThreshold: Perbill = Perbill::from_percent(40);
 	pub HistoryDepth: u32 = 84;
+	pub const BurnAccountId: frame_support::PalletId = frame_support::PalletId(*b"burnburn");
 }
 
 impl pallet_bags_list::Config for Runtime {
@@ -270,6 +271,7 @@ impl pallet_staking::Config for Runtime {
 	type AdminOrigin = EnsureRoot<AccountId>; // root can cancel slashes
 	type SessionInterface = Self;
 	type EraPayout = ();
+	type TreasuryPalletId = BurnAccountId; // burn inflation if treasury fraction > 0.
 	type NextNewSession = Session;
 	type MaxNominatorRewardedPerValidator = MaxNominatorRewardedPerValidator;
 	type OffendingValidatorsThreshold = OffendingValidatorsThreshold;

substrate/frame/fast-unstake/src/mock.rs

@@ -114,6 +114,7 @@ parameter_types! {
 	pub static CurrentEra: u32 = 0;
 	pub static Ongoing: bool = false;
 	pub static MaxWinners: u32 = 100;
+	pub const BurnAccountId: frame_support::PalletId = frame_support::PalletId(*b"burnburn");
 }
 
 pub struct MockElection;
@@ -149,6 +150,7 @@ impl pallet_staking::Config for Runtime {
 	type BondingDuration = BondingDuration;
 	type SessionInterface = ();
 	type EraPayout = pallet_staking::ConvertCurve<RewardCurve>;
+	type TreasuryPalletId = BurnAccountId; // burn inflation if treasury fraction > 0.
 	type NextNewSession = ();
 	type HistoryDepth = ConstU32<84>;
 	type MaxNominatorRewardedPerValidator = ConstU32<64>;

substrate/frame/grandpa/src/mock.rs

@@ -168,6 +168,7 @@ parameter_types! {
 	pub const RewardCurve: &'static PiecewiseLinear<'static> = &REWARD_CURVE;
 	pub const OffendingValidatorsThreshold: Perbill = Perbill::from_percent(17);
 	pub static ElectionsBoundsOnChain: ElectionBounds = ElectionBoundsBuilder::default().build();
+	pub const BurnAccountId: frame_support::PalletId = frame_support::PalletId(*b"burnburn");
 }
 
 pub struct OnChainSeqPhragmen;
@@ -195,6 +196,7 @@ impl pallet_staking::Config for Test {
 	type SessionInterface = Self;
 	type UnixTime = pallet_timestamp::Pallet<Test>;
 	type EraPayout = pallet_staking::ConvertCurve<RewardCurve>;
+	type TreasuryPalletId = BurnAccountId; // burn inflation if treasury fraction > 0.
 	type MaxNominatorRewardedPerValidator = ConstU32<64>;
 	type OffendingValidatorsThreshold = OffendingValidatorsThreshold;
 	type NextNewSession = Session;

substrate/frame/nomination-pools/benchmarking/src/mock.rs

@@ -92,6 +92,7 @@ pallet_staking_reward_curve::build! {
 }
 parameter_types! {
 	pub const RewardCurve: &'static sp_runtime::curve::PiecewiseLinear<'static> = &I_NPOS;
+	pub const BurnAccountId: frame_support::PalletId = frame_support::PalletId(*b"burnburn");
 }
 impl pallet_staking::Config for Runtime {
 	type Currency = Balances;
@@ -108,6 +109,7 @@ impl pallet_staking::Config for Runtime {
 	type BondingDuration = ConstU32<3>;
 	type SessionInterface = ();
 	type EraPayout = pallet_staking::ConvertCurve<RewardCurve>;
+	type TreasuryPalletId = BurnAccountId; // burn inflation if treasury fraction > 0.
 	type NextNewSession = ();
 	type MaxNominatorRewardedPerValidator = ConstU32<64>;
 	type OffendingValidatorsThreshold = ();

substrate/frame/nomination-pools/test-staking/src/mock.rs

@@ -105,6 +105,7 @@ pallet_staking_reward_curve::build! {
 parameter_types! {
 	pub const RewardCurve: &'static sp_runtime::curve::PiecewiseLinear<'static> = &I_NPOS;
 	pub static BondingDuration: u32 = 3;
+	pub const BurnAccountId: frame_support::PalletId = frame_support::PalletId(*b"burnburn");
 }
 
 impl pallet_staking::Config for Runtime {
@@ -122,6 +123,7 @@ impl pallet_staking::Config for Runtime {
 	type BondingDuration = BondingDuration;
 	type SessionInterface = ();
 	type EraPayout = pallet_staking::ConvertCurve<RewardCurve>;
+	type TreasuryPalletId = BurnAccountId; // burn inflation if treasury fraction > 0.
 	type NextNewSession = ();
 	type MaxNominatorRewardedPerValidator = ConstU32<64>;
 	type OffendingValidatorsThreshold = ();

substrate/frame/offences/benchmarking/src/mock.rs

@@ -145,6 +145,7 @@ pallet_staking_reward_curve::build! {
 parameter_types! {
 	pub const RewardCurve: &'static sp_runtime::curve::PiecewiseLinear<'static> = &I_NPOS;
 	pub static ElectionsBounds: ElectionBounds = ElectionBoundsBuilder::default().build();
+	pub const BurnAccountId: frame_support::PalletId = frame_support::PalletId(*b"burnburn");
 }
 
 pub type Extrinsic = sp_runtime::testing::TestXt<RuntimeCall, ()>;
@@ -174,6 +175,7 @@ impl pallet_staking::Config for Test {
 	type BondingDuration = ();
 	type SessionInterface = Self;
 	type EraPayout = pallet_staking::ConvertCurve<RewardCurve>;
+	type TreasuryPalletId = BurnAccountId; // burn inflation if treasury fraction > 0.
 	type NextNewSession = Session;
 	type MaxNominatorRewardedPerValidator = ConstU32<64>;
 	type OffendingValidatorsThreshold = ();

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

@@ -160,6 +160,7 @@ parameter_types! {
 	pub const BondingDuration: EraIndex = 3;
 	pub static LedgerSlashPerEra: (BalanceOf<Test>, BTreeMap<EraIndex, BalanceOf<Test>>) = (Zero::zero(), BTreeMap::new());
 	pub const OffendingValidatorsThreshold: Perbill = Perbill::from_percent(75);
+	pub const BurnAccountId: frame_support::PalletId = frame_support::PalletId(*b"burnburn");
 }
 
 impl pallet_staking::Config for Test {
@@ -177,6 +178,7 @@ impl pallet_staking::Config for Test {
 	type BondingDuration = BondingDuration;
 	type SessionInterface = Self;
 	type EraPayout = pallet_staking::ConvertCurve<RewardCurve>;
+	type TreasuryPalletId = BurnAccountId; // burn inflation if treasury fraction > 0.
 	type NextNewSession = Session;
 	type MaxNominatorRewardedPerValidator = ConstU32<64>;
 	type OffendingValidatorsThreshold = OffendingValidatorsThreshold;

substrate/frame/session/benchmarking/src/mock.rs

@@ -144,6 +144,7 @@ pallet_staking_reward_curve::build! {
 parameter_types! {
 	pub const RewardCurve: &'static sp_runtime::curve::PiecewiseLinear<'static> = &I_NPOS;
 	pub static ElectionsBounds: ElectionBounds = ElectionBoundsBuilder::default().build();
+	pub const BurnAccountId: frame_support::PalletId = frame_support::PalletId(*b"burnburn");
 }
 
 pub struct OnChainSeqPhragmen;
@@ -171,6 +172,7 @@ impl pallet_staking::Config for Test {
 	type BondingDuration = ();
 	type SessionInterface = Self;
 	type EraPayout = pallet_staking::ConvertCurve<RewardCurve>;
+	type TreasuryPalletId = BurnAccountId; // burn inflation if treasury fraction > 0.
 	type NextNewSession = Session;
 	type MaxNominatorRewardedPerValidator = ConstU32<64>;
 	type OffendingValidatorsThreshold = ();

substrate/frame/staking/src/benchmarking.rs

@@ -939,6 +939,13 @@ benchmarks! {
 		assert_eq!(MinCommission::<T>::get(), Perbill::from_percent(100));
 	}
 
+	set_treasury_fraction {
+		let treasury_fraction = Percent::max_value();
+	}: _(RawOrigin::Root, treasury_fraction)
+	verify {
+		assert_eq!(TreasuryInflationFraction::<T>::get(), Some(Percent::from_parts(100)));
+	}
+
 	impl_benchmark_test_suite!(
 		Staking,
 		crate::mock::ExtBuilder::default().has_stakers(true),

substrate/frame/staking/src/mock.rs

@@ -29,15 +29,16 @@ use frame_support::{
 		OnUnbalanced, OneSessionHandler,
 	},
 	weights::constants::RocksDbWeight,
+	PalletId,
 };
 use frame_system::{EnsureRoot, EnsureSignedBy};
 use sp_core::H256;
 use sp_io;
 use sp_runtime::{
 	curve::PiecewiseLinear,
 	testing::UintAuthorityId,
-	traits::{IdentityLookup, Zero},
-	BuildStorage,
+	traits::{AccountIdConversion, IdentityLookup, Zero},
+	BuildStorage, Percent,
 };
 use sp_staking::offence::{DisableStrategy, OffenceDetails, OnOffenceHandler};
 
@@ -237,6 +238,7 @@ parameter_types! {
 	pub static MaxWinners: u32 = 100;
 	pub static ElectionsBounds: ElectionBounds = ElectionBoundsBuilder::default().build();
 	pub static AbsoluteMaxNominations: u32 = 16;
+	pub const TreasuryPalletId: PalletId = PalletId(*b"Treasury");
 }
 
 type VoterBagsListInstance = pallet_bags_list::Instance1;
@@ -298,6 +300,7 @@ impl crate::pallet::pallet::Config for Test {
 	type BondingDuration = BondingDuration;
 	type SessionInterface = Self;
 	type EraPayout = ConvertCurve<RewardCurve>;
+	type TreasuryPalletId = TreasuryPalletId;
 	type NextNewSession = Session;
 	type MaxNominatorRewardedPerValidator = ConstU32<64>;
 	type OffendingValidatorsThreshold = OffendingValidatorsThreshold;
@@ -346,6 +349,7 @@ pub struct ExtBuilder {
 	pub min_nominator_bond: Balance,
 	min_validator_bond: Balance,
 	balance_factor: Balance,
+	treasury_fraction: Percent,
 	status: BTreeMap<AccountId, StakerStatus<AccountId>>,
 	stakes: BTreeMap<AccountId, Balance>,
 	stakers: Vec<(AccountId, AccountId, Balance, StakerStatus<AccountId>)>,
@@ -358,6 +362,7 @@ impl Default for ExtBuilder {
 			validator_count: 2,
 			minimum_validator_count: 0,
 			balance_factor: 1,
+			treasury_fraction: Percent::from_percent(0),
 			invulnerables: vec![],
 			has_stakers: true,
 			initialize_first_session: true,
@@ -445,6 +450,10 @@ impl ExtBuilder {
 		self.balance_factor = factor;
 		self
 	}
+	pub fn treasury_fraction(mut self, fraction: u8) -> Self {
+		self.treasury_fraction = Percent::from_parts(fraction);
+		self
+	}
 	fn build(self) -> sp_io::TestExternalities {
 		sp_tracing::try_init_simple();
 		let mut storage = frame_system::GenesisConfig::<Test>::default().build_storage().unwrap();
@@ -532,6 +541,7 @@ impl ExtBuilder {
 			slash_reward_fraction: Perbill::from_percent(10),
 			min_nominator_bond: self.min_nominator_bond,
 			min_validator_bond: self.min_validator_bond,
+			treasury_inflation_fraction: self.treasury_fraction,
 			..Default::default()
 		}
 		.assimilate_storage(&mut storage);
@@ -777,6 +787,10 @@ pub(crate) fn make_all_reward_payment(era: EraIndex) {
 	}
 }
 
+pub(crate) fn treasury_account_id() -> AccountId {
+	TreasuryPalletId::get().into_account_truncating()
+}
+
 #[macro_export]
 macro_rules! assert_session_era {
 	($session:expr, $era:expr) => {