Update para sudo wrapper pallet to FRAME v2 (#3074)

* Migrate para sudo wrapper pallet to pallet attribute macro.

* Apply review suggestions.

polkadot/runtime/common/src/paras_sudo_wrapper.rs

@@ -16,13 +16,8 @@
 
 //! A simple wrapper allowing `Sudo` to call into `paras` routines.
 
-use sp_std::prelude::*;
-use frame_support::{
-	decl_error, decl_module, ensure,
-	dispatch::DispatchResult,
-	weights::DispatchClass,
-};
-use frame_system::ensure_root;
+use frame_support::pallet_prelude::*;
+use frame_system::pallet_prelude::*;
 use runtime_parachains::{
 	configuration, dmp, ump, hrmp,
 	ParaLifecycle,
@@ -30,15 +25,24 @@ use runtime_parachains::{
 };
 use primitives::v1::Id as ParaId;
 use parity_scale_codec::Encode;
+pub use pallet::*;
 
-/// The module's configuration trait.
-pub trait Config:
-	configuration::Config + paras::Config + dmp::Config + ump::Config + hrmp::Config
-{
-}
+#[frame_support::pallet]
+pub mod pallet {
+	use super::*;
+
+	#[pallet::pallet]
+	#[pallet::generate_store(pub(super) trait Store)]
+	pub struct Pallet<T>(_);
+
+	#[pallet::config]
+	#[pallet::disable_frame_system_supertrait_check]
+	pub trait Config:
+		configuration::Config + paras::Config + dmp::Config + ump::Config + hrmp::Config {}
 
-decl_error! {
-	pub enum Error for Module<T: Config> {
+
+	#[pallet::error]
+	pub enum Error<T> {
 		/// The specified parachain or parathread is not registered.
 		ParaDoesntExist,
 		/// The specified parachain or parathread is already registered.
@@ -57,50 +61,58 @@ decl_error! {
 		/// Cannot downgrade parachain.
 		CannotDowngrade,
 	}
-}
 
-decl_module! {
-	/// A sudo wrapper to call into v1 paras module.
-	pub struct Module<T: Config> for enum Call where origin: <T as frame_system::Config>::Origin {
-		type Error = Error<T>;
+	#[pallet::hooks]
+	impl<T: Config> Hooks<BlockNumberFor<T>> for Pallet<T> {}
 
+	#[pallet::call]
+	impl<T: Config> Pallet<T> {
 		/// Schedule a para to be initialized at the start of the next session.
-		#[weight = (1_000, DispatchClass::Operational)]
+		#[pallet::weight((1_000, DispatchClass::Operational))]
 		pub fn sudo_schedule_para_initialize(
-			origin,
+			origin: OriginFor<T>,
 			id: ParaId,
 			genesis: ParaGenesisArgs,
 		) -> DispatchResult {
 			ensure_root(origin)?;
-			runtime_parachains::schedule_para_initialize::<T>(id, genesis).map_err(|_| Error::<T>::ParaAlreadyExists)?;
+			runtime_parachains::schedule_para_initialize::<T>(id, genesis)
+				.map_err(|_| Error::<T>::ParaAlreadyExists)?;
 			Ok(())
 		}
 
 		/// Schedule a para to be cleaned up at the start of the next session.
-		#[weight = (1_000, DispatchClass::Operational)]
-		pub fn sudo_schedule_para_cleanup(origin, id: ParaId) -> DispatchResult {
+		#[pallet::weight((1_000, DispatchClass::Operational))]
+		pub fn sudo_schedule_para_cleanup(origin: OriginFor<T>, id: ParaId) -> DispatchResult {
 			ensure_root(origin)?;
 			runtime_parachains::schedule_para_cleanup::<T>(id).map_err(|_| Error::<T>::CouldntCleanup)?;
 			Ok(())
 		}
 
 		/// Upgrade a parathread to a parachain
-		#[weight = (1_000, DispatchClass::Operational)]
-		pub fn sudo_schedule_parathread_upgrade(origin, id: ParaId) -> DispatchResult {
+		#[pallet::weight((1_000, DispatchClass::Operational))]
+		pub fn sudo_schedule_parathread_upgrade(origin: OriginFor<T>, id: ParaId) -> DispatchResult {
 			ensure_root(origin)?;
 			// Para backend should think this is a parathread...
-			ensure!(paras::Module::<T>::lifecycle(id) == Some(ParaLifecycle::Parathread), Error::<T>::NotParathread);
-			runtime_parachains::schedule_parathread_upgrade::<T>(id).map_err(|_| Error::<T>::CannotUpgrade)?;
+			ensure!(
+				paras::Pallet::<T>::lifecycle(id) == Some(ParaLifecycle::Parathread),
+				Error::<T>::NotParathread,
+			);
+			runtime_parachains::schedule_parathread_upgrade::<T>(id)
+				.map_err(|_| Error::<T>::CannotUpgrade)?;
 			Ok(())
 		}
 
 		/// Downgrade a parachain to a parathread
-		#[weight = (1_000, DispatchClass::Operational)]
-		pub fn sudo_schedule_parachain_downgrade(origin, id: ParaId) -> DispatchResult {
+		#[pallet::weight((1_000, DispatchClass::Operational))]
+		pub fn sudo_schedule_parachain_downgrade(origin: OriginFor<T>, id: ParaId) -> DispatchResult {
 			ensure_root(origin)?;
 			// Para backend should think this is a parachain...
-			ensure!(paras::Module::<T>::lifecycle(id) == Some(ParaLifecycle::Parachain), Error::<T>::NotParachain);
-			runtime_parachains::schedule_parachain_downgrade::<T>(id).map_err(|_| Error::<T>::CannotDowngrade)?;
+			ensure!(
+				paras::Pallet::<T>::lifecycle(id) == Some(ParaLifecycle::Parachain),
+				Error::<T>::NotParachain,
+			);
+			runtime_parachains::schedule_parachain_downgrade::<T>(id)
+				.map_err(|_| Error::<T>::CannotDowngrade)?;
 			Ok(())
 		}
 
@@ -108,12 +120,16 @@ decl_module! {
 		///
 		/// The given parachain should exist and the payload should not exceed the preconfigured size
 		/// `config.max_downward_message_size`.
-		#[weight = (1_000, DispatchClass::Operational)]
-		pub fn sudo_queue_downward_xcm(origin, id: ParaId, xcm: xcm::opaque::VersionedXcm) -> DispatchResult {
+		#[pallet::weight((1_000, DispatchClass::Operational))]
+		pub fn sudo_queue_downward_xcm(
+			origin: OriginFor<T>,
+			id: ParaId,
+			xcm: xcm::opaque::VersionedXcm,
+		) -> DispatchResult {
 			ensure_root(origin)?;
-			ensure!(<paras::Module<T>>::is_valid_para(id), Error::<T>::ParaDoesntExist);
-			let config = <configuration::Module<T>>::config();
-			<dmp::Module<T>>::queue_downward_message(&config, id, xcm.encode())
+			ensure!(<paras::Pallet<T>>::is_valid_para(id), Error::<T>::ParaDoesntExist);
+			let config = <configuration::Pallet<T>>::config();
+			<dmp::Pallet<T>>::queue_downward_message(&config, id, xcm.encode())
 				.map_err(|e| match e {
 					dmp::QueueDownwardMessageError::ExceedsMaxMessageSize =>
 						Error::<T>::ExceedsMaxMessageSize.into(),
@@ -124,9 +140,9 @@ decl_module! {
 		///
 		/// This is equivalent to sending an `Hrmp::hrmp_init_open_channel` extrinsic followed by
 		/// `Hrmp::hrmp_accept_open_channel`.
-		#[weight = (1_000, DispatchClass::Operational)]
+		#[pallet::weight((1_000, DispatchClass::Operational))]
 		pub fn sudo_establish_hrmp_channel(
-			origin,
+			origin: OriginFor<T>,
 			sender: ParaId,
 			recipient: ParaId,
 			max_capacity: u32,
@@ -134,13 +150,13 @@ decl_module! {
 		) -> DispatchResult {
 			ensure_root(origin)?;
 
-			<hrmp::Module<T>>::init_open_channel(
+			<hrmp::Pallet<T>>::init_open_channel(
 				sender,
 				recipient,
 				max_capacity,
 				max_message_size,
 			)?;
-			<hrmp::Module<T>>::accept_open_channel(recipient, sender)?;
+			<hrmp::Pallet<T>>::accept_open_channel(recipient, sender)?;
 			Ok(())
 		}
 	}