Implements partial inflation minting to treasury

polkadot/runtime/kusama/src/lib.rs

@@ -702,6 +702,7 @@ impl pallet_staking::Config for Runtime {
 	type AdminOrigin = EitherOf<EnsureRoot<Self::AccountId>, StakingAdmin>;
 	type SessionInterface = Self;
 	type EraPayout = EraPayout;
+	type InflationLevyDestination = Treasury;
 	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

@@ -588,6 +588,7 @@ impl pallet_staking::Config for Runtime {
 	type AdminOrigin = EitherOf<EnsureRoot<Self::AccountId>, StakingAdmin>;
 	type SessionInterface = Self;
 	type EraPayout = EraPayout;
+	type InflationLevyDestination = Treasury;
 	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;
@@ -68,8 +69,8 @@ use sp_runtime::{
 	curve::PiecewiseLinear,
 	generic, impl_opaque_keys,
 	traits::{
-		BlakeTwo256, Block as BlockT, ConvertInto, Extrinsic as ExtrinsicT, OpaqueKeys,
-		SaturatedConversion, StaticLookup, Verify,
+		AccountIdConversion, BlakeTwo256, Block as BlockT, ConvertInto, Extrinsic as ExtrinsicT,
+		OpaqueKeys, SaturatedConversion, StaticLookup, Verify,
 	},
 	transaction_validity::{TransactionPriority, TransactionSource, TransactionValidity},
 	ApplyExtrinsicResult, KeyTypeId, Perbill,
@@ -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 InflationLevyDestination = BurnPot; // burn inflation if treasury fraction > 0.
 	type MaxNominatorRewardedPerValidator = MaxNominatorRewardedPerValidator;
 	type OffendingValidatorsThreshold = OffendingValidatorsThreshold;
 	type NextNewSession = Session;
@@ -368,6 +371,13 @@ impl pallet_staking::Config for Runtime {
 	type WeightInfo = ();
 }
 
+pub struct BurnPot;
+impl sp_runtime::traits::Get<AccountId> for BurnPot {
+	fn get() -> AccountId {
+		BurnAccountId::get().into_account_truncating()
+	}
+}
+
 parameter_types! {
 	pub MaxSetIdSessionEntries: u32 = BondingDuration::get() * SessionsPerEra::get();
 }

polkadot/runtime/westend/src/lib.rs

@@ -95,7 +95,7 @@ pub use pallet_election_provider_multi_phase::{Call as EPMCall, GeometricDeposit
 pub use pallet_staking::StakerStatus;
 use pallet_staking::UseValidatorsMap;
 pub use pallet_timestamp::Call as TimestampCall;
-use sp_runtime::traits::Get;
+use sp_runtime::traits::{AccountIdConversion, Get};
 #[cfg(any(feature = "std", test))]
 pub use sp_runtime::BuildStorage;
 
@@ -625,6 +625,7 @@ 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 {
@@ -642,6 +643,7 @@ impl pallet_staking::Config for Runtime {
 	type AdminOrigin = EnsureRoot<AccountId>;
 	type SessionInterface = Self;
 	type EraPayout = pallet_staking::ConvertCurve<RewardCurve>;
+	type InflationLevyDestination = BurnPot; // burn inflation if treasury fraction > 0.
 	type MaxNominatorRewardedPerValidator = MaxNominatorRewardedPerValidator;
 	type OffendingValidatorsThreshold = OffendingValidatorsThreshold;
 	type NextNewSession = Session;
@@ -657,6 +659,13 @@ impl pallet_staking::Config for Runtime {
 	type WeightInfo = weights::pallet_staking::WeightInfo<Runtime>;
 }
 
+pub struct BurnPot;
+impl Get<AccountId> for BurnPot {
+	fn get() -> AccountId {
+		BurnAccountId::get().into_account_truncating()
+	}
+}
+
 impl pallet_fast_unstake::Config for Runtime {
 	type RuntimeEvent = RuntimeEvent;
 	type Currency = Balances;

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

@@ -658,6 +658,7 @@ impl pallet_staking::Config for Runtime {
 	>;
 	type SessionInterface = Self;
 	type EraPayout = pallet_staking::ConvertCurve<RewardCurve>;
+	type InflationLevyDestination = Treasury;
 	type NextNewSession = Session;
 	type MaxNominatorRewardedPerValidator = MaxNominatorRewardedPerValidator;
 	type OffendingValidatorsThreshold = OffendingValidatorsThreshold;

substrate/frame/babe/src/mock.rs

@@ -39,7 +39,7 @@ use sp_runtime::{
 	curve::PiecewiseLinear,
 	impl_opaque_keys,
 	testing::{Digest, DigestItem, Header, TestXt},
-	traits::{Header as _, IdentityLookup, OpaqueKeys},
+	traits::{AccountIdConversion, Header as _, IdentityLookup, OpaqueKeys},
 	BuildStorage, Perbill,
 };
 use sp_staking::{EraIndex, SessionIndex};
@@ -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 InflationLevyDestination = BurnPot; // burn inflation if treasury fraction > 0.
 	type MaxNominatorRewardedPerValidator = ConstU32<64>;
 	type OffendingValidatorsThreshold = OffendingValidatorsThreshold;
 	type NextNewSession = Session;
@@ -208,6 +210,13 @@ impl pallet_staking::Config for Test {
 	type WeightInfo = ();
 }
 
+pub struct BurnPot;
+impl sp_runtime::traits::Get<DummyValidatorId> for BurnPot {
+	fn get() -> DummyValidatorId {
+		BurnAccountId::get().into_account_truncating()
+	}
+}
+
 impl pallet_offences::Config for Test {
 	type RuntimeEvent = RuntimeEvent;
 	type IdentificationTuple = pallet_session::historical::IdentificationTuple<Self>;

substrate/frame/beefy/src/mock.rs

@@ -33,7 +33,7 @@ use sp_runtime::{
 	curve::PiecewiseLinear,
 	impl_opaque_keys,
 	testing::TestXt,
-	traits::{BlakeTwo256, IdentityLookup, OpaqueKeys},
+	traits::{AccountIdConversion, BlakeTwo256, IdentityLookup, OpaqueKeys},
 	BuildStorage, Perbill,
 };
 use sp_staking::{EraIndex, SessionIndex};
@@ -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 InflationLevyDestination = BurnPot; // burn inflation if treasury fraction > 0.
 	type MaxNominatorRewardedPerValidator = ConstU32<64>;
 	type OffendingValidatorsThreshold = OffendingValidatorsThreshold;
 	type NextNewSession = Session;
@@ -230,6 +232,13 @@ impl pallet_staking::Config for Test {
 	type WeightInfo = ();
 }
 
+pub struct BurnPot;
+impl sp_runtime::traits::Get<u64> for BurnPot {
+	fn get() -> u64 {
+		BurnAccountId::get().into_account_truncating()
+	}
+}
+
 impl pallet_offences::Config for Test {
 	type RuntimeEvent = RuntimeEvent;
 	type IdentificationTuple = pallet_session::historical::IdentificationTuple<Self>;

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

@@ -31,7 +31,7 @@ use sp_runtime::{
 		OffchainDbExt, OffchainWorkerExt, TransactionPoolExt,
 	},
 	testing,
-	traits::Zero,
+	traits::{AccountIdConversion, Zero},
 	transaction_validity, BuildStorage, PerU16, Perbill, Percent,
 };
 use sp_staking::{
@@ -247,6 +247,7 @@ 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 {
@@ -275,6 +276,7 @@ impl pallet_staking::Config for Runtime {
 	type AdminOrigin = EnsureRoot<AccountId>; // root can cancel slashes
 	type SessionInterface = Self;
 	type EraPayout = ();
+	type InflationLevyDestination = BurnPot; // burn inflation if treasury fraction > 0.
 	type NextNewSession = Session;
 	type MaxNominatorRewardedPerValidator = MaxNominatorRewardedPerValidator;
 	type OffendingValidatorsThreshold = OffendingValidatorsThreshold;
@@ -290,6 +292,13 @@ impl pallet_staking::Config for Runtime {
 	type BenchmarkingConfig = pallet_staking::TestBenchmarkingConfig;
 }
 
+pub struct BurnPot;
+impl sp_runtime::traits::Get<AccountId> for BurnPot {
+	fn get() -> AccountId {
+		BurnAccountId::get().into_account_truncating()
+	}
+}
+
 impl<LocalCall> frame_system::offchain::SendTransactionTypes<LocalCall> for Runtime
 where
 	RuntimeCall: From<LocalCall>,

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

@@ -24,7 +24,7 @@ use frame_support::{
 	weights::constants::WEIGHT_REF_TIME_PER_SECOND,
 };
 use sp_runtime::{
-	traits::{Convert, IdentityLookup},
+	traits::{AccountIdConversion, Convert, IdentityLookup},
 	BuildStorage,
 };
 
@@ -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 InflationLevyDestination = BurnPot; // burn inflation if treasury fraction > 0.
 	type NextNewSession = ();
 	type HistoryDepth = ConstU32<84>;
 	type MaxNominatorRewardedPerValidator = ConstU32<64>;
@@ -164,6 +166,13 @@ impl pallet_staking::Config for Runtime {
 	type WeightInfo = ();
 }
 
+pub struct BurnPot;
+impl sp_runtime::traits::Get<AccountId> for BurnPot {
+	fn get() -> AccountId {
+		BurnAccountId::get().into_account_truncating()
+	}
+}
+
 pub struct BalanceToU256;
 impl Convert<Balance, sp_core::U256> for BalanceToU256 {
 	fn convert(n: Balance) -> sp_core::U256 {

substrate/frame/grandpa/src/mock.rs

@@ -38,7 +38,7 @@ use sp_runtime::{
 	curve::PiecewiseLinear,
 	impl_opaque_keys,
 	testing::{TestXt, UintAuthorityId},
-	traits::{IdentityLookup, OpaqueKeys},
+	traits::{AccountIdConversion, IdentityLookup, OpaqueKeys},
 	BuildStorage, DigestItem, Perbill,
 };
 use sp_staking::{EraIndex, SessionIndex};
@@ -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 InflationLevyDestination = BurnPot; // burn inflation if treasury fraction > 0.
 	type MaxNominatorRewardedPerValidator = ConstU32<64>;
 	type OffendingValidatorsThreshold = OffendingValidatorsThreshold;
 	type NextNewSession = Session;
@@ -210,6 +212,13 @@ impl pallet_staking::Config for Test {
 	type WeightInfo = ();
 }
 
+pub struct BurnPot;
+impl sp_runtime::traits::Get<u64> for BurnPot {
+	fn get() -> u64 {
+		BurnAccountId::get().into_account_truncating()
+	}
+}
+
 impl pallet_offences::Config for Test {
 	type RuntimeEvent = RuntimeEvent;
 	type IdentificationTuple = pallet_session::historical::IdentificationTuple<Self>;

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

@@ -19,7 +19,7 @@ use crate::VoterBagsListInstance;
 use frame_election_provider_support::VoteWeight;
 use frame_support::{pallet_prelude::*, parameter_types, traits::ConstU64, PalletId};
 use sp_runtime::{
-	traits::{Convert, IdentityLookup},
+	traits::{AccountIdConversion, Convert, IdentityLookup},
 	BuildStorage, FixedU128, Perbill,
 };
 
@@ -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 InflationLevyDestination = BurnPot; // burn inflation if treasury fraction > 0.
 	type NextNewSession = ();
 	type MaxNominatorRewardedPerValidator = ConstU32<64>;
 	type OffendingValidatorsThreshold = ();
@@ -124,6 +126,13 @@ impl pallet_staking::Config for Runtime {
 	type WeightInfo = ();
 }
 
+pub struct BurnPot;
+impl sp_runtime::traits::Get<AccountId> for BurnPot {
+	fn get() -> AccountId {
+		BurnAccountId::get().into_account_truncating()
+	}
+}
+
 parameter_types! {
 	pub static BagThresholds: &'static [VoteWeight] = &[10, 20, 30, 40, 50, 60, 1_000, 2_000, 10_000];
 }