Optional PoV block limits

bin/node/runtime/src/impls.rs

@@ -134,7 +134,7 @@ mod multiplier_tests {
 		BlockWeights::get()
 			.get(DispatchClass::Normal)
 			.max_total
-			.unwrap_or_else(|| BlockWeights::get().max_block)
+			.limited_or(BlockWeights::get().max_block)
 	}
 
 	fn min_multiplier() -> Multiplier {
@@ -284,8 +284,9 @@ mod multiplier_tests {
 		// `cargo test congested_chain_simulation -- --nocapture` to get some insight.
 
 		// almost full. The entire quota of normal transactions is taken.
-		let block_weight = BlockWeights::get().get(DispatchClass::Normal).max_total.unwrap() -
-			Weight::from_ref_time(100);
+		let block_weight =
+			BlockWeights::get().get(DispatchClass::Normal).max_total.exact_limits().unwrap() -
+				Weight::from_ref_time(100);
 
 		// Default substrate weight.
 		let tx_weight = frame_support::weights::constants::ExtrinsicBaseWeight::get();

bin/node/runtime/src/lib.rs

@@ -190,15 +190,15 @@ parameter_types! {
 			weights.base_extrinsic = ExtrinsicBaseWeight::get();
 		})
 		.for_class(DispatchClass::Normal, |weights| {
-			weights.max_total = Some(NORMAL_DISPATCH_RATIO * MAXIMUM_BLOCK_WEIGHT);
+			weights.max_total = (NORMAL_DISPATCH_RATIO * MAXIMUM_BLOCK_WEIGHT).into();
 		})
 		.for_class(DispatchClass::Operational, |weights| {
-			weights.max_total = Some(MAXIMUM_BLOCK_WEIGHT);
+			weights.max_total = (MAXIMUM_BLOCK_WEIGHT).into();
 			// Operational transactions have some extra reserved space, so that they
 			// are included even if block reached `MAXIMUM_BLOCK_WEIGHT`.
-			weights.reserved = Some(
+			weights.reserved = (
 				MAXIMUM_BLOCK_WEIGHT - NORMAL_DISPATCH_RATIO * MAXIMUM_BLOCK_WEIGHT
-			);
+			).into();
 		})
 		.avg_block_initialization(AVERAGE_ON_INITIALIZE_RATIO)
 		.build_or_panic();
@@ -614,7 +614,9 @@ parameter_types! {
 	pub const MultiPhaseUnsignedPriority: TransactionPriority = StakingUnsignedPriority::get() - 1u64;
 	pub MinerMaxWeight: Weight = RuntimeBlockWeights::get()
 		.get(DispatchClass::Normal)
-		.max_extrinsic.expect("Normal extrinsics have a weight limit configured; qed")
+		.max_extrinsic
+		.exact_limits()
+		.expect("Normal extrinsics have a weight limit configured; qed")
 		.saturating_sub(BlockExecutionWeight::get());
 	// Solution can occupy 90% of normal block size
 	pub MinerMaxLength: u32 = Perbill::from_rational(9u32, 10) *
@@ -1187,7 +1189,7 @@ parameter_types! {
 		.per_class
 		.get(DispatchClass::Normal)
 		.max_total
-		.unwrap_or(RuntimeBlockWeights::get().max_block);
+		.limited_or(RuntimeBlockWeights::get().max_block);
 	pub Schedule: pallet_contracts::Schedule<Runtime> = Default::default();
 }
 

frame/executive/src/lib.rs

@@ -1125,7 +1125,8 @@ mod tests {
 		// on_initialize weight + base block execution weight
 		let block_weights = <Runtime as frame_system::Config>::BlockWeights::get();
 		let base_block_weight = Weight::from_ref_time(175) + block_weights.base_block;
-		let limit = block_weights.get(DispatchClass::Normal).max_total.unwrap() - base_block_weight;
+		let limit = block_weights.get(DispatchClass::Normal).max_total.exact_limits().unwrap() -
+			base_block_weight;
 		let num_to_exhaust_block = limit.ref_time() / (encoded_len + 5);
 		t.execute_with(|| {
 			Executive::initialize_block(&Header::new(

frame/support/src/dispatch.rs

@@ -423,33 +423,35 @@ impl<T: Clone> PerDispatchClass<T> {
 
 impl PerDispatchClass<Weight> {
 	/// Returns the total weight consumed by all extrinsics in the block.
+	///
+	/// Saturates on overflow.
 	pub fn total(&self) -> Weight {
 		let mut sum = Weight::zero();
 		for class in DispatchClass::all() {
-			sum = sum.saturating_add(*self.get(*class));
+			sum.saturating_accrue(*self.get(*class));
 		}
 		sum
 	}
 
-	/// Add some weight of a specific dispatch class, saturating at the numeric bounds of `Weight`.
-	pub fn add(&mut self, weight: Weight, class: DispatchClass) {
-		let value = self.get_mut(class);
-		*value = value.saturating_add(weight);
+	/// Add some weight to the given class. Saturates at the numeric bounds.
+	pub fn saturating_add(mut self, weight: Weight, class: DispatchClass) -> Self {
+		self.saturating_accrue(weight, class);
+		self
+	}
+
+	/// Increase the weight of the given class. Saturates at the numeric bounds.
+	pub fn saturating_accrue(&mut self, weight: Weight, class: DispatchClass) {
+		self.get_mut(class).saturating_accrue(weight);
 	}
 
-	/// Try to add some weight of a specific dispatch class, returning Err(()) if overflow would
-	/// occur.
-	pub fn checked_add(&mut self, weight: Weight, class: DispatchClass) -> Result<(), ()> {
-		let value = self.get_mut(class);
-		*value = value.checked_add(&weight).ok_or(())?;
-		Ok(())
+	/// Try to increase the weight of the given class. Saturates at the numeric bounds.
+	pub fn checked_accrue(&mut self, weight: Weight, class: DispatchClass) -> Result<(), ()> {
+		self.get_mut(class).checked_accrue(weight).ok_or(())
 	}
 
-	/// Subtract some weight of a specific dispatch class, saturating at the numeric bounds of
-	/// `Weight`.
-	pub fn sub(&mut self, weight: Weight, class: DispatchClass) {
-		let value = self.get_mut(class);
-		*value = value.saturating_sub(weight);
+	/// Reduce the weight of the given class. Saturates at the numeric bounds.
+	pub fn saturating_reduce(&mut self, weight: Weight, class: DispatchClass) {
+		self.get_mut(class).saturating_reduce(weight);
 	}
 }
 
@@ -3693,3 +3695,195 @@ mod weight_tests {
 		assert_eq!(extract_actual_pays_fee(&Ok((Some(1000), Pays::Yes).into()), &pre), Pays::No);
 	}
 }
+
+#[cfg(test)]
+mod per_dispatch_class_tests {
+	use super::*;
+	use sp_runtime::traits::Zero;
+	use DispatchClass::*;
+
+	// helper trait
+	trait IntoWeight {
+		fn into_weight(self) -> Weight;
+	}
+
+	impl IntoWeight for u64 {
+		fn into_weight(self) -> Weight {
+			Weight::from_all(self)
+		}
+	}
+
+	impl IntoWeight for (u64, u64) {
+		fn into_weight(self) -> Weight {
+			Weight::from_parts(self.0, self.1)
+		}
+	}
+
+	#[test]
+	fn saturating_add_works() {
+		let a = PerDispatchClass {
+			normal: (5, 10).into_weight(),
+			operational: (20, 30).into_weight(),
+			mandatory: Weight::MAX,
+		};
+		assert_eq!(
+			a.clone()
+				.saturating_add((20, 5).into_weight(), Normal)
+				.saturating_add((10, 10).into_weight(), Operational)
+				.saturating_add((u64::MAX, 3).into_weight(), Mandatory),
+			PerDispatchClass {
+				normal: (25, 15).into_weight(),
+				operational: (30, 40).into_weight(),
+				mandatory: Weight::MAX
+			}
+		);
+		let b = a
+			.saturating_add(Weight::MAX, Normal)
+			.saturating_add(Weight::MAX, Operational)
+			.saturating_add(Weight::MAX, Mandatory);
+		assert_eq!(
+			b,
+			PerDispatchClass {
+				normal: Weight::MAX,
+				operational: Weight::MAX,
+				mandatory: Weight::MAX
+			}
+		);
+		assert_eq!(b.total(), Weight::MAX);
+	}
+
+	#[test]
+	fn saturating_accrue_works() {
+		let mut a = PerDispatchClass::default();
+
+		a.saturating_accrue((10, 15).into_weight(), Normal);
+		assert_eq!(a.normal, (10, 15).into_weight());
+		assert_eq!(a.total(), (10, 15).into_weight());
+
+		a.saturating_accrue((20, 25).into_weight(), Operational);
+		assert_eq!(a.operational, (20, 25).into_weight());
+		assert_eq!(a.total(), (30, 40).into_weight());
+
+		a.saturating_accrue((30, 35).into_weight(), Mandatory);
+		assert_eq!(a.mandatory, (30, 35).into_weight());
+		assert_eq!(a.total(), (60, 75).into_weight());
+
+		a.saturating_accrue((u64::MAX, 10).into_weight(), Operational);
+		assert_eq!(a.operational, (u64::MAX, 35).into_weight());
+		assert_eq!(a.total(), (u64::MAX, 85).into_weight());
+
+		a.saturating_accrue((10, u64::MAX).into_weight(), Normal);
+		assert_eq!(a.normal, (20, u64::MAX).into_weight());
+		assert_eq!(a.total(), Weight::MAX);
+	}
+
+	#[test]
+	fn saturating_reduce_works() {
+		let mut a = PerDispatchClass {
+			normal: (10, u64::MAX).into_weight(),
+			mandatory: (u64::MAX, 10).into_weight(),
+			operational: (20, 20).into_weight(),
+		};
+
+		a.saturating_reduce((5, 100).into_weight(), Normal);
+		assert_eq!(a.normal, (5, u64::MAX - 100).into_weight());
+		assert_eq!(a.total(), (u64::MAX, u64::MAX - 70).into_weight());
+
+		a.saturating_reduce((15, 5).into_weight(), Operational);
+		assert_eq!(a.operational, (5, 15).into_weight());
+		assert_eq!(a.total(), (u64::MAX, u64::MAX - 75).into_weight());
+
+		a.saturating_reduce((50, 0).into_weight(), Mandatory);
+		assert_eq!(a.mandatory, (u64::MAX - 50, 10).into_weight());
+		assert_eq!(a.total(), (u64::MAX - 40, u64::MAX - 75).into_weight());
+
+		a.saturating_reduce((u64::MAX, 100).into_weight(), Operational);
+		assert!(a.operational.is_zero());
+		assert_eq!(a.total(), (u64::MAX - 45, u64::MAX - 90).into_weight());
+
+		a.saturating_reduce((5, u64::MAX).into_weight(), Normal);
+		assert!(a.normal.is_zero());
+		assert_eq!(a.total(), (u64::MAX - 50, 10).into_weight());
+	}
+
+	#[test]
+	fn checked_accrue_works() {
+		let mut a = PerDispatchClass::default();
+
+		a.checked_accrue((1, 2).into_weight(), Normal).unwrap();
+		a.checked_accrue((3, 4).into_weight(), Operational).unwrap();
+		a.checked_accrue((5, 6).into_weight(), Mandatory).unwrap();
+		a.checked_accrue((7, 8).into_weight(), Operational).unwrap();
+		a.checked_accrue((9, 0).into_weight(), Normal).unwrap();
+
+		assert_eq!(
+			a,
+			PerDispatchClass {
+				normal: (10, 2).into_weight(),
+				operational: (10, 12).into_weight(),
+				mandatory: (5, 6).into_weight(),
+			}
+		);
+
+		a.checked_accrue((u64::MAX - 10, u64::MAX - 2).into_weight(), Normal).unwrap();
+		a.checked_accrue((0, 0).into_weight(), Normal).unwrap();
+		a.checked_accrue((1, 0).into_weight(), Normal).unwrap_err();
+		a.checked_accrue((0, 1).into_weight(), Normal).unwrap_err();
+
+		assert_eq!(
+			a,
+			PerDispatchClass {
+				normal: Weight::MAX,
+				operational: (10, 12).into_weight(),
+				mandatory: (5, 6).into_weight(),
+			}
+		);
+	}
+
+	#[test]
+	fn checked_accrue_does_not_modify_on_error() {
+		let mut a = PerDispatchClass {
+			normal: 0.into_weight(),
+			operational: Weight::MAX / 2 + 2.into_weight(),
+			mandatory: 10.into_weight(),
+		};
+
+		a.checked_accrue(Weight::MAX / 2, Operational).unwrap_err();
+		a.checked_accrue(Weight::MAX - 9.into_weight(), Mandatory).unwrap_err();
+		a.checked_accrue(Weight::MAX, Normal).unwrap(); // This one works
+
+		assert_eq!(
+			a,
+			PerDispatchClass {
+				normal: Weight::MAX,
+				operational: Weight::MAX / 2 + 2.into_weight(),
+				mandatory: 10.into_weight(),
+			}
+		);
+	}
+
+	#[test]
+	fn total_works() {
+		assert!(PerDispatchClass::default().total().is_zero());
+
+		assert_eq!(
+			PerDispatchClass {
+				normal: 0.into_weight(),
+				operational: (10, 20).into_weight(),
+				mandatory: (20, u64::MAX).into_weight(),
+			}
+			.total(),
+			(30, u64::MAX).into_weight()
+		);
+
+		assert_eq!(
+			PerDispatchClass {
+				normal: (u64::MAX - 10, 10).into_weight(),
+				operational: (3, u64::MAX).into_weight(),
+				mandatory: (4, u64::MAX).into_weight(),
+			}
+			.total(),
+			(u64::MAX - 3, u64::MAX).into_weight()
+		);
+	}
+}