Companion for substrate/pull/6896 (#1610)

* make polkadot work again,

* Fix build

* "Update Substrate"

Co-authored-by: parity-processbot <>

polkadot/runtime/common/src/impls.rs

@@ -16,7 +16,6 @@
 
 //! Auxillary struct/enums for polkadot runtime.
 
-use sp_runtime::traits::Convert;
 use frame_support::traits::{OnUnbalanced, Imbalance, Currency};
 use crate::NegativeImbalance;
 
@@ -41,33 +40,3 @@ where
 		<frame_system::Module<R>>::deposit_event(pallet_balances::RawEvent::Deposit(author, numeric_amount));
 	}
 }
-
-/// Converter for currencies to votes.
-pub struct CurrencyToVoteHandler<R>(sp_std::marker::PhantomData<R>);
-
-impl<R> CurrencyToVoteHandler<R>
-where
-	R: pallet_balances::Trait,
-	R::Balance: Into<u128>,
-{
-	fn factor() -> u128 {
-		let issuance: u128 = <pallet_balances::Module<R>>::total_issuance().into();
-		(issuance / u64::max_value() as u128).max(1)
-	}
-}
-
-impl<R> Convert<u128, u64> for CurrencyToVoteHandler<R>
-where
-	R: pallet_balances::Trait,
-	R::Balance: Into<u128>,
-{
-	fn convert(x: u128) -> u64 { (x / Self::factor()) as u64 }
-}
-
-impl<R> Convert<u128, u128> for CurrencyToVoteHandler<R>
-where
-	R: pallet_balances::Trait,
-	R::Balance: Into<u128>,
-{
-	fn convert(x: u128) -> u128 { x * Self::factor() }
-}

polkadot/runtime/common/src/lib.rs

@@ -45,7 +45,7 @@ pub use pallet_timestamp::Call as TimestampCall;
 pub use pallet_balances::Call as BalancesCall;
 
 /// Implementations of some helper traits passed into runtime modules as associated types.
-pub use impls::{CurrencyToVoteHandler, ToAuthor};
+pub use impls::ToAuthor;
 
 pub type NegativeImbalance<T> = <pallet_balances::Module<T> as Currency<<T as frame_system::Trait>::AccountId>>::NegativeImbalance;
 
@@ -89,6 +89,12 @@ pub type SlowAdjustingFeeUpdate<R> = TargetedFeeAdjustment<
 	MinimumMultiplier
 >;
 
+/// The type used for currency conversion.
+///
+/// This must only be used as long as the balance type is u128.
+pub type CurrencyToVote = frame_support::traits::U128CurrencyToVote;
+static_assertions::assert_eq_size!(primitives::v1::Balance, u128);
+
 /// A placeholder since there is currently no provided session key handler for parachain validator
 /// keys.
 pub struct ParachainSessionKeyPlaceholder<T>(sp_std::marker::PhantomData<T>);

polkadot/runtime/common/src/paras_registrar.rs

@@ -395,7 +395,7 @@ mod tests {
 
 	impl pallet_staking::Trait for Test {
 		type RewardRemainder = ();
-		type CurrencyToVote = ();
+		type CurrencyToVote = frame_support::traits::SaturatingCurrencyToVote;
 		type Event = ();
 		type Currency = pallet_balances::Module<Test>;
 		type Slash = ();

polkadot/runtime/kusama/src/lib.rs

@@ -29,8 +29,8 @@ use primitives::v1::{
 	PersistedValidationData, Signature, ValidationCode, ValidationData, ValidatorId, ValidatorIndex,
 };
 use runtime_common::{
-	claims, SlowAdjustingFeeUpdate,
-	impls::{CurrencyToVoteHandler, ToAuthor},
+	claims, SlowAdjustingFeeUpdate, CurrencyToVote,
+	impls::ToAuthor,
 	NegativeImbalance, BlockHashCount, MaximumBlockWeight, AvailableBlockRatio,
 	MaximumBlockLength, BlockExecutionWeight, ExtrinsicBaseWeight, RocksDbWeight,
 	MaximumExtrinsicWeight, ParachainSessionKeyPlaceholder,
@@ -346,7 +346,7 @@ type SlashCancelOrigin = EnsureOneOf<
 impl pallet_staking::Trait for Runtime {
 	type Currency = Balances;
 	type UnixTime = Timestamp;
-	type CurrencyToVote = CurrencyToVoteHandler<Self>;
+	type CurrencyToVote = CurrencyToVote;
 	type RewardRemainder = Treasury;
 	type Event = Event;
 	type Slash = Treasury;
@@ -469,7 +469,7 @@ impl pallet_elections_phragmen::Trait for Runtime {
 	type Currency = Balances;
 	type ChangeMembers = Council;
 	type InitializeMembers = Council;
-	type CurrencyToVote = CurrencyToVoteHandler<Self>;
+	type CurrencyToVote = frame_support::traits::U128CurrencyToVote;
 	type CandidacyBond = CandidacyBond;
 	type VotingBond = VotingBond;
 	type LoserCandidate = Treasury;

polkadot/runtime/polkadot/src/lib.rs

@@ -21,8 +21,8 @@
 #![recursion_limit="256"]
 
 use runtime_common::{
-	claims, SlowAdjustingFeeUpdate,
-	impls::{CurrencyToVoteHandler, ToAuthor},
+	claims, SlowAdjustingFeeUpdate, CurrencyToVote,
+	impls::ToAuthor,
 	NegativeImbalance, BlockHashCount, MaximumBlockWeight, AvailableBlockRatio,
 	MaximumBlockLength, BlockExecutionWeight, ExtrinsicBaseWeight, RocksDbWeight,
 	MaximumExtrinsicWeight, ParachainSessionKeyPlaceholder,
@@ -353,7 +353,7 @@ type SlashCancelOrigin = EnsureOneOf<
 impl pallet_staking::Trait for Runtime {
 	type Currency = Balances;
 	type UnixTime = Timestamp;
-	type CurrencyToVote = CurrencyToVoteHandler<Self>;
+	type CurrencyToVote = CurrencyToVote;
 	type RewardRemainder = Treasury;
 	type Event = Event;
 	type Slash = Treasury;
@@ -516,7 +516,7 @@ impl pallet_elections_phragmen::Trait for Runtime {
 	type Currency = Balances;
 	type ChangeMembers = Council;
 	type InitializeMembers = Council;
-	type CurrencyToVote = CurrencyToVoteHandler<Self>;
+	type CurrencyToVote = frame_support::traits::U128CurrencyToVote;
 	type CandidacyBond = CandidacyBond;
 	type VotingBond = VotingBond;
 	type LoserCandidate = Treasury;

polkadot/runtime/rococo-v1/src/lib.rs

@@ -30,7 +30,7 @@ use primitives::v1::{
 };
 use runtime_common::{
 	SlowAdjustingFeeUpdate,
-	impls::{CurrencyToVoteHandler, ToAuthor},
+	impls::ToAuthor,
 	BlockHashCount, MaximumBlockWeight, AvailableBlockRatio, MaximumBlockLength,
 	BlockExecutionWeight, ExtrinsicBaseWeight, RocksDbWeight, MaximumExtrinsicWeight,
 };
@@ -560,7 +560,7 @@ impl pallet_im_online::Trait for Runtime {
 impl pallet_staking::Trait for Runtime {
 	type Currency = Balances;
 	type UnixTime = Timestamp;
-	type CurrencyToVote = CurrencyToVoteHandler<Self>;
+	type CurrencyToVote = frame_support::traits::U128CurrencyToVote;
 	type RewardRemainder = ();
 	type Event = Event;
 	type Slash = ();

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

@@ -37,7 +37,7 @@ use primitives::v1::{
 	PersistedValidationData, Signature, ValidationCode, ValidationData, ValidatorId, ValidatorIndex,
 };
 use runtime_common::{
-	claims, SlowAdjustingFeeUpdate, impls::CurrencyToVoteHandler,
+	claims, SlowAdjustingFeeUpdate,
 	BlockHashCount, MaximumBlockWeight, AvailableBlockRatio,
 	MaximumBlockLength, BlockExecutionWeight, ExtrinsicBaseWeight, ParachainSessionKeyPlaceholder,
 };
@@ -297,7 +297,7 @@ parameter_types! {
 impl pallet_staking::Trait for Runtime {
 	type Currency = Balances;
 	type UnixTime = Timestamp;
-	type CurrencyToVote = CurrencyToVoteHandler<Self>;
+	type CurrencyToVote = frame_support::traits::U128CurrencyToVote;
 	type RewardRemainder = ();
 	type Event = Event;
 	type Slash = ();

polkadot/runtime/westend/src/lib.rs

@@ -28,8 +28,8 @@ use primitives::v1::{
 	PersistedValidationData, Signature, ValidationCode, ValidationData, ValidatorId, ValidatorIndex,
 };
 use runtime_common::{
-	SlowAdjustingFeeUpdate,
-	impls::{CurrencyToVoteHandler, ToAuthor},
+	SlowAdjustingFeeUpdate, CurrencyToVote,
+	impls::ToAuthor,
 	BlockHashCount, MaximumBlockWeight, AvailableBlockRatio, MaximumBlockLength,
 	BlockExecutionWeight, ExtrinsicBaseWeight, RocksDbWeight, MaximumExtrinsicWeight,
 	ParachainSessionKeyPlaceholder,
@@ -318,7 +318,7 @@ parameter_types! {
 impl pallet_staking::Trait for Runtime {
 	type Currency = Balances;
 	type UnixTime = Timestamp;
-	type CurrencyToVote = CurrencyToVoteHandler<Self>;
+	type CurrencyToVote = CurrencyToVote;
 	type RewardRemainder = ();
 	type Event = Event;
 	type Slash = ();