Rococo: ability to programatically assign slots to teams (#3943)

* Permanent & Temp parachain slots on Rococo - WIP

* Revert test change

* Revert test change

* Fix formatting

* Extract logic to separate assigned_slots pallet

* Formatting

* Parachain downgrade logic

* Pallet doc comment

* Revert unnecessary changes

* Fix few issues, tweak temp slots allocation logic; add a bunch of tests

* Address review comments; track active temp slots

* Update runtime/common/src/assigned_slots.rs

* Update runtime/common/src/assigned_slots.rs

* Remove assigned_slots calls from paras_sudo_wrapper

* Unassign is a perfectly valid verb

* Remove unneeded collect

* Update code following #3980

* Cleanup

* Generate storage info for pallet

* Address review comments

* Add ForceOrigin to slots pallet

* Track permanent slot duration in storage

* Fix tests build

Co-authored-by: Alexander Popiak <alexander.popiak@parity.io>

polkadot/runtime/common/src/integration_tests.rs

@@ -216,6 +216,7 @@ impl slots::Config for Test {
 	type Registrar = Registrar;
 	type LeasePeriod = LeasePeriod;
 	type LeaseOffset = LeaseOffset;
+	type ForceOrigin = EnsureRoot<AccountId>;
 	type WeightInfo = crate::slots::TestWeightInfo;
 }
 

polkadot/runtime/common/src/lib.rs

@@ -18,6 +18,7 @@
 
 #![cfg_attr(not(feature = "std"), no_std)]
 
+pub mod assigned_slots;
 pub mod auctions;
 pub mod claims;
 pub mod crowdloan;

polkadot/runtime/common/src/slots.rs

@@ -87,6 +87,9 @@ pub mod pallet {
 		#[pallet::constant]
 		type LeaseOffset: Get<Self::BlockNumber>;
 
+		/// The origin which may forcibly create or clear leases. Root can always do this.
+		type ForceOrigin: EnsureOrigin<<Self as frame_system::Config>::Origin>;
+
 		/// Weight Information for the Extrinsics in the Pallet
 		type WeightInfo: WeightInfo;
 	}
@@ -159,7 +162,7 @@ pub mod pallet {
 		/// Just a connect into the `lease_out` call, in case Root wants to force some lease to happen
 		/// independently of any other on-chain mechanism to use it.
 		///
-		/// Can only be called by the Root origin.
+		/// The dispatch origin for this call must match `T::ForceOrigin`.
 		#[pallet::weight(T::WeightInfo::force_lease())]
 		pub fn force_lease(
 			origin: OriginFor<T>,
@@ -169,7 +172,7 @@ pub mod pallet {
 			period_begin: LeasePeriodOf<T>,
 			period_count: LeasePeriodOf<T>,
 		) -> DispatchResult {
-			ensure_root(origin)?;
+			T::ForceOrigin::ensure_origin(origin)?;
 			Self::lease_out(para, &leaser, amount, period_begin, period_count)
 				.map_err(|_| Error::<T>::LeaseError)?;
 			Ok(())
@@ -177,10 +180,10 @@ pub mod pallet {
 
 		/// Clear all leases for a Para Id, refunding any deposits back to the original owners.
 		///
-		/// Can only be called by the Root origin.
+		/// The dispatch origin for this call must match `T::ForceOrigin`.
 		#[pallet::weight(T::WeightInfo::clear_all_leases())]
 		pub fn clear_all_leases(origin: OriginFor<T>, para: ParaId) -> DispatchResult {
-			ensure_root(origin)?;
+			T::ForceOrigin::ensure_origin(origin)?;
 			let deposits = Self::all_deposits_held(para);
 
 			// Refund any deposits for these leases
@@ -495,6 +498,7 @@ mod tests {
 
 	use crate::{mock::TestRegistrar, slots};
 	use frame_support::{assert_noop, assert_ok, parameter_types};
+	use frame_system::EnsureRoot;
 	use pallet_balances;
 	use primitives::v1::{BlockNumber, Header};
 	use sp_core::H256;
@@ -572,6 +576,7 @@ mod tests {
 		type Registrar = TestRegistrar<Test>;
 		type LeasePeriod = LeasePeriod;
 		type LeaseOffset = LeaseOffset;
+		type ForceOrigin = EnsureRoot<Self::AccountId>;
 		type WeightInfo = crate::slots::TestWeightInfo;
 	}