Sudo wrapper for paras (#1517)

* Sudo wrapper for paras

* Move to separate module

* Add some docs

polkadot/runtime/common/src/paras_sudo_wrapper.rs

@@ -0,0 +1,63 @@
+// Copyright 2020 Parity Technologies (UK) Ltd.
+// This file is part of Polkadot.
+
+// Polkadot is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// Polkadot is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with Polkadot.  If not, see <http://www.gnu.org/licenses/>.
+
+//! A simple wrapper allowing `Sudo` to call into `paras` routines.
+
+use frame_support::{
+	decl_error, decl_module,
+	dispatch::DispatchResult,
+	weights::DispatchClass,
+};
+use system::ensure_root;
+use runtime_parachains::paras::{
+	self,
+	ParaGenesisArgs,
+};
+use primitives::v1::Id as ParaId;
+
+/// The module's configuration trait.
+pub trait Trait: paras::Trait { }
+
+decl_error! {
+	pub enum Error for Module<T: Trait> { }
+}
+
+decl_module! {
+	/// A sudo wrapper to call into v1 paras module.
+	pub struct Module<T: Trait> for enum Call where origin: <T as system::Trait>::Origin, system = system {
+		type Error = Error<T>;
+
+		/// Schedule a para to be initialized at the start of the next session.
+		#[weight = (1_000, DispatchClass::Operational)]
+		pub fn sudo_schedule_para_initialize(
+			origin,
+			id: ParaId,
+			genesis: ParaGenesisArgs,
+		) -> DispatchResult {
+			ensure_root(origin)?;
+			paras::Module::<T>::schedule_para_initialize(id, genesis);
+			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 {
+			ensure_root(origin)?;
+			paras::Module::<T>::schedule_para_cleanup(id);
+			Ok(())
+		}
+	}
+}