Migrating polkadot-runtime-common slots benchmarking to v2 (#6614)

#Description
Migrated polkadot-runtime-parachains slots benchmarking to the new
benchmarking syntax v2.
This is part of #6202

---------

Co-authored-by: Giuseppe Re <giuseppe.re@parity.io>
Co-authored-by: seemantaggarwal <32275622+seemantaggarwal@users.noreply.github.com>
Co-authored-by: Bastian Köcher <git@kchr.de>

polkadot/runtime/common/src/slots/mod.rs

@@ -149,7 +149,7 @@ pub mod pallet {
 			if let Some((lease_period, first_block)) = Self::lease_period_index(n) {
 				// If we're beginning a new lease period then handle that.
 				if first_block {
-					return Self::manage_lease_period_start(lease_period)
+					return Self::manage_lease_period_start(lease_period);
 				}
 			}
 
@@ -237,7 +237,7 @@ impl<T: Config> Pallet<T> {
 		let mut parachains = Vec::new();
 		for (para, mut lease_periods) in Leases::<T>::iter() {
 			if lease_periods.is_empty() {
-				continue
+				continue;
 			}
 			// ^^ should never be empty since we would have deleted the entry otherwise.
 
@@ -381,7 +381,7 @@ impl<T: Config> Leaser<BlockNumberFor<T>> for Pallet<T> {
 						// attempt.
 						//
 						// We bail, not giving any lease and leave it for governance to sort out.
-						return Err(LeaseError::AlreadyLeased)
+						return Err(LeaseError::AlreadyLeased);
 					}
 				} else if d.len() == i {
 					// Doesn't exist. This is usual.
@@ -488,7 +488,7 @@ impl<T: Config> Leaser<BlockNumberFor<T>> for Pallet<T> {
 		for slot in offset..=offset + period_count {
 			if let Some(Some(_)) = leases.get(slot) {
 				// If there exists any lease period, we exit early and return true.
-				return true
+				return true;
 			}
 		}
 
@@ -962,7 +962,7 @@ mod benchmarking {
 	use polkadot_runtime_parachains::paras;
 	use sp_runtime::traits::{Bounded, One};
 
-	use frame_benchmarking::{account, benchmarks, whitelisted_caller, BenchmarkError};
+	use frame_benchmarking::v2::*;
 
 	use crate::slots::Pallet as Slots;
 
@@ -998,10 +998,15 @@ mod benchmarking {
 		(para, leaser)
 	}
 
-	benchmarks! {
-		where_clause { where T: paras::Config }
+	#[benchmarks(
+		where T: paras::Config,
+	)]
 
-		force_lease {
+	mod benchmarks {
+		use super::*;
+
+		#[benchmark]
+		fn force_lease() -> Result<(), BenchmarkError> {
 			// If there is an offset, we need to be on that block to be able to do lease things.
 			frame_system::Pallet::<T>::set_block_number(T::LeaseOffset::get() + One::one());
 			let para = ParaId::from(1337);
@@ -1012,23 +1017,32 @@ mod benchmarking {
 			let period_count = 3u32.into();
 			let origin =
 				T::ForceOrigin::try_successful_origin().map_err(|_| BenchmarkError::Weightless)?;
-		}: _<T::RuntimeOrigin>(origin, para, leaser.clone(), amount, period_begin, period_count)
-		verify {
-			assert_last_event::<T>(Event::<T>::Leased {
-				para_id: para,
-				leaser, period_begin,
-				period_count,
-				extra_reserved: amount,
-				total_amount: amount,
-			}.into());
-		}
 
-		// Worst case scenario, T on-demand parachains onboard, and C lease holding parachains offboard.
-		manage_lease_period_start {
-			// Assume reasonable maximum of 100 paras at any time
-			let c in 0 .. 100;
-			let t in 0 .. 100;
+			#[extrinsic_call]
+			_(origin as T::RuntimeOrigin, para, leaser.clone(), amount, period_begin, period_count);
+
+			assert_last_event::<T>(
+				Event::<T>::Leased {
+					para_id: para,
+					leaser,
+					period_begin,
+					period_count,
+					extra_reserved: amount,
+					total_amount: amount,
+				}
+				.into(),
+			);
 
+			Ok(())
+		}
+
+		// Worst case scenario, T on-demand parachains onboard, and C lease holding parachains
+		// offboard. Assume reasonable maximum of 100 paras at any time
+		#[benchmark]
+		fn manage_lease_period_start(
+			c: Linear<0, 100>,
+			t: Linear<0, 100>,
+		) -> Result<(), BenchmarkError> {
 			let period_begin = 1u32.into();
 			let period_count = 4u32.into();
 
@@ -1036,9 +1050,7 @@ mod benchmarking {
 			frame_system::Pallet::<T>::set_block_number(T::LeaseOffset::get() + One::one());
 
 			// Make T parathreads (on-demand parachains)
-			let paras_info = (0..t).map(|i| {
-				register_a_parathread::<T>(i)
-			}).collect::<Vec<_>>();
+			let paras_info = (0..t).map(|i| register_a_parathread::<T>(i)).collect::<Vec<_>>();
 
 			T::Registrar::execute_pending_transitions();
 
@@ -1053,43 +1065,48 @@ mod benchmarking {
 			T::Registrar::execute_pending_transitions();
 
 			// C lease holding parachains are downgrading to on-demand parachains
-			for i in 200 .. 200 + c {
-				let (para, leaser) = register_a_parathread::<T>(i);
+			for i in 200..200 + c {
+				let (para, _) = register_a_parathread::<T>(i);
 				T::Registrar::make_parachain(para)?;
 			}
 
 			T::Registrar::execute_pending_transitions();
 
-			for i in 0 .. t {
+			for i in 0..t {
 				assert!(T::Registrar::is_parathread(ParaId::from(i)));
 			}
 
-			for i in 200 .. 200 + c {
+			for i in 200..200 + c {
 				assert!(T::Registrar::is_parachain(ParaId::from(i)));
 			}
-		}: {
-				Slots::<T>::manage_lease_period_start(period_begin);
-		} verify {
+			#[block]
+			{
+				let _ = Slots::<T>::manage_lease_period_start(period_begin);
+			}
+
 			// All paras should have switched.
 			T::Registrar::execute_pending_transitions();
-			for i in 0 .. t {
+			for i in 0..t {
 				assert!(T::Registrar::is_parachain(ParaId::from(i)));
 			}
-			for i in 200 .. 200 + c {
+			for i in 200..200 + c {
 				assert!(T::Registrar::is_parathread(ParaId::from(i)));
 			}
+
+			Ok(())
 		}
 
 		// Assume that at most 8 people have deposits for leases on a parachain.
 		// This would cover at least 4 years of leases in the worst case scenario.
-		clear_all_leases {
+		#[benchmark]
+		fn clear_all_leases() -> Result<(), BenchmarkError> {
 			let max_people = 8;
 			let (para, _) = register_a_parathread::<T>(1);
 
 			// If there is an offset, we need to be on that block to be able to do lease things.
 			frame_system::Pallet::<T>::set_block_number(T::LeaseOffset::get() + One::one());
 
-			for i in 0 .. max_people {
+			for i in 0..max_people {
 				let leaser = account("lease_deposit", i, 0);
 				let amount = T::Currency::minimum_balance();
 				T::Currency::make_free_balance_be(&leaser, BalanceOf::<T>::max_value());
@@ -1102,31 +1119,45 @@ mod benchmarking {
 				Slots::<T>::force_lease(origin, para, leaser, amount, period_begin, period_count)?;
 			}
 
-			for i in 0 .. max_people {
+			for i in 0..max_people {
 				let leaser = account("lease_deposit", i, 0);
 				assert_eq!(T::Currency::reserved_balance(&leaser), T::Currency::minimum_balance());
 			}
 
 			let origin =
 				T::ForceOrigin::try_successful_origin().map_err(|_| BenchmarkError::Weightless)?;
-		}: _<T::RuntimeOrigin>(origin, para)
-		verify {
-			for i in 0 .. max_people {
+
+			#[extrinsic_call]
+			_(origin as T::RuntimeOrigin, para);
+
+			for i in 0..max_people {
 				let leaser = account("lease_deposit", i, 0);
 				assert_eq!(T::Currency::reserved_balance(&leaser), 0u32.into());
 			}
+
+			Ok(())
 		}
 
-		trigger_onboard {
+		#[benchmark]
+		fn trigger_onboard() -> Result<(), BenchmarkError> {
 			// get a parachain into a bad state where they did not onboard
 			let (para, _) = register_a_parathread::<T>(1);
-			Leases::<T>::insert(para, vec![Some((account::<T::AccountId>("lease_insert", 0, 0), BalanceOf::<T>::default()))]);
+			Leases::<T>::insert(
+				para,
+				vec![Some((
+					account::<T::AccountId>("lease_insert", 0, 0),
+					BalanceOf::<T>::default(),
+				))],
+			);
 			assert!(T::Registrar::is_parathread(para));
 			let caller = whitelisted_caller();
-		}: _(RawOrigin::Signed(caller), para)
-		verify {
+
+			#[extrinsic_call]
+			_(RawOrigin::Signed(caller), para);
+
 			T::Registrar::execute_pending_transitions();
 			assert!(T::Registrar::is_parachain(para));
+			Ok(())
 		}
 
 		impl_benchmark_test_suite!(