Upgrade pallets to FRAMEv2 (#404)

* Upgrade parachain info pallet to FRAMEv2 * Upgrade parachain system pallet to FRAMEv2 * Use Pallet<T> instead of Module<T> * Upgrade XCMP queue pallet to FRAMEv2 * Correctly specify the metadata for events in xcmp-queue pallet * Apply suggestions from code review * Update pallets/parachain-system/src/tests.rs Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>
2026-06-13 02:21:14 +00:00 · 2021-05-08 13:18:01 -07:00
parent 2641c5b830
commit 647a9e6df9
6 changed files with 1691 additions and 1500 deletions
@@ -25,29 +25,145 @@

 #![cfg_attr(not(feature = "std"), no_std)]

-use sp_std::{prelude::*, convert::TryFrom};
-use rand_chacha::{rand_core::{RngCore, SeedableRng}, ChaChaRng};
 use codec::{Decode, Encode};
-use sp_runtime::{RuntimeDebug, traits::Hash};
-use frame_support::{decl_error, decl_event, decl_module, decl_storage, dispatch::Weight};
-use xcm::{
-	VersionedXcm, v0::{
-		Error as XcmError, ExecuteXcm, Junction, MultiLocation, SendXcm, Outcome, Xcm,
-	},
-};
 use cumulus_primitives_core::{
-	XcmpMessageHandler, ParaId, XcmpMessageSource, ChannelStatus, MessageSendError, GetChannelInfo,
-	relay_chain::BlockNumber as RelayBlockNumber,
+	relay_chain::BlockNumber as RelayBlockNumber, ChannelStatus, GetChannelInfo, MessageSendError,
+	ParaId, XcmpMessageHandler, XcmpMessageSource,
+};
+use frame_support::weights::Weight;
+use rand_chacha::{
+	rand_core::{RngCore, SeedableRng},
+	ChaChaRng,
+};
+use sp_runtime::{traits::Hash, RuntimeDebug};
+use sp_std::{convert::TryFrom, prelude::*};
+use xcm::{
+	v0::{Error as XcmError, ExecuteXcm, Junction, MultiLocation, Outcome, SendXcm, Xcm},
+	VersionedXcm,
 };

-pub trait Config: frame_system::Config {
-	type Event: From<Event<Self>> + Into<<Self as frame_system::Config>::Event>;
+pub use pallet::*;

-	/// Something to execute an XCM message. We need this to service the XCMoXCMP queue.
-	type XcmExecutor: ExecuteXcm<Self::Call>;
+#[frame_support::pallet]
+pub mod pallet {
+	use super::*;
+	use frame_support::pallet_prelude::*;
+	use frame_system::pallet_prelude::*;

-	/// Information on the avaialble XCMP channels.
-	type ChannelInfo: GetChannelInfo;
+	#[pallet::pallet]
+	#[pallet::generate_store(pub(super) trait Store)]
+	pub struct Pallet<T>(_);
+
+	#[pallet::config]
+	pub trait Config: frame_system::Config {
+		type Event: From<Event<Self>> + IsType<<Self as frame_system::Config>::Event>;
+
+		/// Something to execute an XCM message. We need this to service the XCMoXCMP queue.
+		type XcmExecutor: ExecuteXcm<Self::Call>;
+
+		/// Information on the avaialble XCMP channels.
+		type ChannelInfo: GetChannelInfo;
+	}
+
+	impl Default for QueueConfigData {
+		fn default() -> Self {
+			Self {
+				suspend_threshold: 2,
+				drop_threshold: 5,
+				resume_threshold: 1,
+				threshold_weight: 100_000,
+				weight_restrict_decay: 2,
+			}
+		}
+	}
+
+	#[pallet::hooks]
+	impl<T: Config> Hooks<BlockNumberFor<T>> for Pallet<T> {
+		fn on_idle(_now: T::BlockNumber, max_weight: Weight) -> Weight {
+			// on_idle processes additional messages with any remaining block weight.
+			Self::service_xcmp_queue(max_weight)
+		}
+	}
+
+	#[pallet::call]
+	impl<T: Config> Pallet<T> {}
+
+	#[pallet::event]
+	#[pallet::generate_deposit(pub(super) fn deposit_event)]
+	#[pallet::metadata(Option<T::Hash> = "Option<Hash>")]
+	pub enum Event<T: Config> {
+		/// Some XCM was executed ok.
+		Success(Option<T::Hash>),
+		/// Some XCM failed.
+		Fail(Option<T::Hash>, XcmError),
+		/// Bad XCM version used.
+		BadVersion(Option<T::Hash>),
+		/// Bad XCM format used.
+		BadFormat(Option<T::Hash>),
+		/// An upward message was sent to the relay chain.
+		UpwardMessageSent(Option<T::Hash>),
+		/// An HRMP message was sent to a sibling parachain.
+		XcmpMessageSent(Option<T::Hash>),
+	}
+
+	#[pallet::error]
+	pub enum Error<T> {
+		/// Failed to send XCM message.
+		FailedToSend,
+		/// Bad XCM origin.
+		BadXcmOrigin,
+		/// Bad XCM data.
+		BadXcm,
+	}
+
+	/// Status of the inbound XCMP channels.
+	#[pallet::storage]
+	pub(super) type InboundXcmpStatus<T: Config> = StorageValue<
+		_,
+		Vec<(
+			ParaId,
+			InboundStatus,
+			Vec<(RelayBlockNumber, XcmpMessageFormat)>,
+		)>,
+		ValueQuery,
+	>;
+
+	/// Inbound aggregate XCMP messages. It can only be one per ParaId/block.
+	#[pallet::storage]
+	pub(super) type InboundXcmpMessages<T: Config> = StorageDoubleMap<
+		_,
+		Blake2_128Concat,
+		ParaId,
+		Twox64Concat,
+		RelayBlockNumber,
+		Vec<u8>,
+		ValueQuery,
+	>;
+
+	/// The non-empty XCMP channels in order of becoming non-empty, and the index of the first
+	/// and last outbound message. If the two indices are equal, then it indicates an empty
+	/// queue and there must be a non-`Ok` `OutboundStatus`. We assume queues grow no greater
+	/// than 65535 items. Queue indices for normal messages begin at one; zero is reserved in
+	/// case of the need to send a high-priority signal message this block.
+	/// The bool is true if there is a signal message waiting to be sent.
+	#[pallet::storage]
+	pub(super) type OutboundXcmpStatus<T: Config> =
+		StorageValue<_, Vec<(ParaId, OutboundStatus, bool, u16, u16)>, ValueQuery>;
+
+	// The new way of doing it:
+	/// The messages outbound in a given XCMP channel.
+	#[pallet::storage]
+	pub(super) type OutboundXcmpMessages<T: Config> =
+		StorageDoubleMap<_, Blake2_128Concat, ParaId, Twox64Concat, u16, Vec<u8>, ValueQuery>;
+
+	/// Any signal messages waiting to be sent.
+	#[pallet::storage]
+	pub(super) type SignalMessages<T: Config> =
+		StorageMap<_, Blake2_128Concat, ParaId, Vec<u8>, ValueQuery>;
+
+	/// The configuration which controls the dynamics of the outbound queue.
+	#[pallet::storage]
+	pub(super) type QueueConfig<T: Config> = StorageValue<_, QueueConfigData, ValueQuery>;
 }

 #[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Encode, Decode, RuntimeDebug)]
@@ -80,90 +196,6 @@ pub struct QueueConfigData {
 	weight_restrict_decay: Weight,
 }

-impl Default for QueueConfigData {
-	fn default() -> Self {
-		Self {
-			suspend_threshold: 2,
-			drop_threshold: 5,
-			resume_threshold: 1,
-			threshold_weight: 100_000,
-			weight_restrict_decay: 2,
-		}
-	}
-}
-
-decl_storage! {
-	trait Store for Module<T: Config> as XcmHandler {
-		/// Status of the inbound XCMP channels.
-		InboundXcmpStatus: Vec<(ParaId, InboundStatus, Vec<(RelayBlockNumber, XcmpMessageFormat)>)>;
-
-		/// Inbound aggregate XCMP messages. It can only be one per ParaId/block.
-		InboundXcmpMessages: double_map hasher(blake2_128_concat) ParaId,
-			hasher(twox_64_concat) RelayBlockNumber
-			=> Vec<u8>;
-
-		/// The non-empty XCMP channels in order of becoming non-empty, and the index of the first
-		/// and last outbound message. If the two indices are equal, then it indicates an empty
-		/// queue and there must be a non-`Ok` `OutboundStatus`. We assume queues grow no greater
-		/// than 65535 items. Queue indices for normal messages begin at one; zero is reserved in
-		/// case of the need to send a high-priority signal message this block.
-		/// The bool is true if there is a signal message waiting to be sent.
-		OutboundXcmpStatus: Vec<(ParaId, OutboundStatus, bool, u16, u16)>;
-
-		// The new way of doing it:
-		/// The messages outbound in a given XCMP channel.
-		OutboundXcmpMessages: double_map hasher(blake2_128_concat) ParaId,
-			hasher(twox_64_concat) u16 => Vec<u8>;
-
-		/// Any signal messages waiting to be sent.
-		SignalMessages: map hasher(blake2_128_concat) ParaId => Vec<u8>;
-
-		/// The configuration which controls the dynamics of the outbound queue.
-		QueueConfig: QueueConfigData;
-	}
-}
-
-decl_event! {
-	pub enum Event<T> where Hash = <T as frame_system::Config>::Hash {
-		/// Some XCM was executed ok.
-		Success(Option<Hash>),
-		/// Some XCM failed.
-		Fail(Option<Hash>, XcmError),
-		/// Bad XCM version used.
-		BadVersion(Option<Hash>),
-		/// Bad XCM format used.
-		BadFormat(Option<Hash>),
-		/// An upward message was sent to the relay chain.
-		UpwardMessageSent(Option<Hash>),
-		/// An HRMP message was sent to a sibling parachain.
-		XcmpMessageSent(Option<Hash>),
-	}
-}
-
-decl_error! {
-	pub enum Error for Module<T: Config> {
-		/// Failed to send XCM message.
-		FailedToSend,
-		/// Bad XCM origin.
-		BadXcmOrigin,
-		/// Bad XCM data.
-		BadXcm,
-	}
-}
-
-decl_module! {
-	pub struct Module<T: Config> for enum Call where origin: T::Origin {
-		type Error = Error<T>;
-
-		fn deposit_event() = default;
-
-		fn on_idle(_now: T::BlockNumber, max_weight: Weight) -> Weight {
-			// on_idle processes additional messages with any remaining block weight.
-			Self::service_xcmp_queue(max_weight)
-		}
-	}
-}
-
 #[derive(PartialEq, Eq, Copy, Clone, Encode, Decode)]
 pub enum ChannelSignal {
 	Suspend,
@@ -182,7 +214,7 @@ pub enum XcmpMessageFormat {
 	Signals,
 }

-impl<T: Config> Module<T> {
+impl<T: Config> Pallet<T> {
 	/// Place a message `fragment` on the outgoing XCMP queue for `recipient`.
 	///
 	/// Format is the type of aggregate message that the `fragment` may be safely encoded and
@@ -213,25 +245,32 @@ impl<T: Config> Module<T> {
 		// Optimization note: `max_message_size` could potentially be stored in
 		// `OutboundXcmpMessages` once known; that way it's only accessed when a new page is needed.

-		let max_message_size = T::ChannelInfo::get_channel_max(recipient)
-			.ok_or(MessageSendError::NoChannel)?;
+		let max_message_size =
+			T::ChannelInfo::get_channel_max(recipient).ok_or(MessageSendError::NoChannel)?;
 		if data.len() > max_message_size {
 			return Err(MessageSendError::TooBig);
 		}

-		let mut s = OutboundXcmpStatus::get();
-		let index = s.iter().position(|item| item.0 == recipient)
+		let mut s = <OutboundXcmpStatus<T>>::get();
+		let index = s
+			.iter()
+			.position(|item| item.0 == recipient)
 			.unwrap_or_else(|| {
 				s.push((recipient, OutboundStatus::Ok, false, 0, 0));
 				s.len() - 1
 			});
 		let have_active = s[index].4 > s[index].3;
-		let appended = have_active && OutboundXcmpMessages::mutate(recipient, s[index].4 - 1, |s| {
-			if XcmpMessageFormat::decode(&mut &s[..]) != Ok(format) { return false }
-			if s.len() + data.len() > max_message_size { return false }
-			s.extend_from_slice(&data[..]);
-			return true
-		});
+		let appended = have_active
+			&& <OutboundXcmpMessages<T>>::mutate(recipient, s[index].4 - 1, |s| {
+				if XcmpMessageFormat::decode(&mut &s[..]) != Ok(format) {
+					return false;
+				}
+				if s.len() + data.len() > max_message_size {
+					return false;
+				}
+				s.extend_from_slice(&data[..]);
+				return true;
+			});
 		if appended {
 			Ok((s[index].4 - s[index].3 - 1) as u32)
 		} else {
@@ -240,9 +279,9 @@ impl<T: Config> Module<T> {
 			s[index].4 += 1;
 			let mut new_page = format.encode();
 			new_page.extend_from_slice(&data[..]);
-			OutboundXcmpMessages::insert(recipient, page_index, new_page);
+			<OutboundXcmpMessages<T>>::insert(recipient, page_index, new_page);
 			let r = (s[index].4 - s[index].3 - 1) as u32;
-			OutboundXcmpStatus::put(s);
+			<OutboundXcmpStatus<T>>::put(s);
 			Ok(r)
 		}
 	}
@@ -250,26 +289,25 @@ impl<T: Config> Module<T> {
 	/// Sends a signal to the `dest` chain over XCMP. This is guaranteed to be dispatched on this
 	/// block.
 	fn send_signal(dest: ParaId, signal: ChannelSignal) -> Result<(), ()> {
-		let mut s = OutboundXcmpStatus::get();
+		let mut s = <OutboundXcmpStatus<T>>::get();
 		if let Some(index) = s.iter().position(|item| item.0 == dest) {
 			s[index].2 = true;
 		} else {
 			s.push((dest, OutboundStatus::Ok, true, 0, 0));
 		}
-		SignalMessages::mutate(dest, |page| if page.is_empty() {
-			*page = (XcmpMessageFormat::Signals, signal).encode();
-		} else {
-			signal.using_encoded(|s| page.extend_from_slice(s));
+		<SignalMessages<T>>::mutate(dest, |page| {
+			if page.is_empty() {
+				*page = (XcmpMessageFormat::Signals, signal).encode();
+			} else {
+				signal.using_encoded(|s| page.extend_from_slice(s));
+			}
 		});
-		OutboundXcmpStatus::put(s);
+		<OutboundXcmpStatus<T>>::put(s);

 		Ok(())
 	}

-	pub fn send_blob_message(
-		recipient: ParaId,
-		blob: Vec<u8>,
-	) -> Result<u32, MessageSendError> {
+	pub fn send_blob_message(recipient: ParaId, blob: Vec<u8>) -> Result<u32, MessageSendError> {
 		Self::send_fragment(recipient, XcmpMessageFormat::ConcatenatedEncodedBlob, blob)
 	}

@@ -284,8 +322,10 @@ impl<T: Config> Module<T> {
 		// Create a shuffled order for use to iterate through.
 		// Not a great random seed, but good enough for our purposes.
 		let seed = frame_system::Pallet::<T>::parent_hash();
-		let seed = <[u8; 32]>::decode(&mut sp_runtime::traits::TrailingZeroInput::new(seed.as_ref()))
-			.expect("input is padded with zeroes; qed");
+		let seed = <[u8; 32]>::decode(&mut sp_runtime::traits::TrailingZeroInput::new(
+			seed.as_ref(),
+		))
+		.expect("input is padded with zeroes; qed");
 		let mut rng = ChaChaRng::from_seed(seed);
 		let mut shuffled = (0..len).collect::<Vec<_>>();
 		for i in 0..len {
@@ -297,7 +337,12 @@ impl<T: Config> Module<T> {
 		shuffled
 	}

-	fn handle_blob_message(_sender: ParaId, _sent_at: RelayBlockNumber, _blob: Vec<u8>, _weight_limit: Weight) -> Result<Weight, bool> {
+	fn handle_blob_message(
+		_sender: ParaId,
+		_sent_at: RelayBlockNumber,
+		_blob: Vec<u8>,
+		_weight_limit: Weight,
+	) -> Result<Weight, bool> {
 		debug_assert!(false, "Blob messages not handled.");
 		Err(false)
 	}
@@ -312,23 +357,19 @@ impl<T: Config> Module<T> {
 		log::debug!("Processing XCMP-XCM: {:?}", &hash);
 		let (result, event) = match Xcm::<T::Call>::try_from(xcm) {
 			Ok(xcm) => {
-				let location = (
-					Junction::Parent,
-					Junction::Parachain(sender.into()),
-				);
-				match T::XcmExecutor::execute_xcm(
-					location.into(),
-					xcm,
-					max_weight,
-				) {
-					Outcome::Error(e) => (Err(e.clone()), RawEvent::Fail(Some(hash), e)),
-					Outcome::Complete(w) => (Ok(w), RawEvent::Success(Some(hash))),
+				let location = (Junction::Parent, Junction::Parachain(sender.into()));
+				match T::XcmExecutor::execute_xcm(location.into(), xcm, max_weight) {
+					Outcome::Error(e) => (Err(e.clone()), Event::Fail(Some(hash), e)),
+					Outcome::Complete(w) => (Ok(w), Event::Success(Some(hash))),
 					// As far as the caller is concerned, this was dispatched without error, so
 					// we just report the weight used.
-					Outcome::Incomplete(w, e) => (Ok(w), RawEvent::Fail(Some(hash), e)),
+					Outcome::Incomplete(w, e) => (Ok(w), Event::Fail(Some(hash), e)),
 				}
 			}
-			Err(()) => (Err(XcmError::UnhandledXcmVersion), RawEvent::BadVersion(Some(hash))),
+			Err(()) => (
+				Err(XcmError::UnhandledXcmVersion),
+				Event::BadVersion(Some(hash)),
+			),
 		};
 		Self::deposit_event(event);
 		result
@@ -339,7 +380,7 @@ impl<T: Config> Module<T> {
 		(sent_at, format): (RelayBlockNumber, XcmpMessageFormat),
 		max_weight: Weight,
 	) -> (Weight, bool) {
-		let data = InboundXcmpMessages::get(sender, sent_at);
+		let data = <InboundXcmpMessages<T>>::get(sender, sent_at);
 		let mut last_remaining_fragments;
 		let mut remaining_fragments = &data[..];
 		let mut weight_used = 0;
@@ -397,9 +438,9 @@ impl<T: Config> Module<T> {
 		}
 		let is_empty = remaining_fragments.is_empty();
 		if is_empty {
-			InboundXcmpMessages::remove(sender, sent_at);
+			<InboundXcmpMessages<T>>::remove(sender, sent_at);
 		} else {
-			InboundXcmpMessages::insert(sender, sent_at, remaining_fragments);
+			<InboundXcmpMessages<T>>::insert(sender, sent_at, remaining_fragments);
 		}
 		(weight_used, is_empty)
 	}
@@ -432,9 +473,9 @@ impl<T: Config> Module<T> {
 	/// for the second &c. though empirical and or practical factors may give rise to adjusting it
 	/// further.
 	fn service_xcmp_queue(max_weight: Weight) -> Weight {
-		let mut status = InboundXcmpStatus::get(); // <- sorted.
+		let mut status = <InboundXcmpStatus<T>>::get(); // <- sorted.
 		if status.len() == 0 {
-			return 0
+			return 0;
 		}

 		let QueueConfigData {
@@ -442,7 +483,7 @@ impl<T: Config> Module<T> {
 			threshold_weight,
 			weight_restrict_decay,
 			..
-		} = QueueConfig::get();
+		} = <QueueConfig<T>>::get();

 		let mut shuffled = Self::create_shuffle(status.len());
 		let mut weight_used = 0;
@@ -457,7 +498,9 @@ impl<T: Config> Module<T> {
 		// send more, heavier messages.

 		let mut shuffle_index = 0;
-		while shuffle_index < shuffled.len() && max_weight.saturating_sub(weight_used) >= threshold_weight {
+		while shuffle_index < shuffled.len()
+			&& max_weight.saturating_sub(weight_used) >= threshold_weight
+		{
 			let index = shuffled[shuffle_index];
 			let sender = status[index].0;

@@ -466,7 +509,8 @@ impl<T: Config> Module<T> {
 				// first round. For the second round we unlock all weight. If we come close enough
 				// on the first round to unlocking everything, then we do so.
 				if shuffle_index < status.len() {
-					weight_available += (max_weight - weight_available) / (weight_restrict_decay + 1);
+					weight_available +=
+						(max_weight - weight_available) / (weight_restrict_decay + 1);
 					if weight_available + threshold_weight > max_weight {
 						weight_available = max_weight;
 					}
@@ -476,16 +520,16 @@ impl<T: Config> Module<T> {
 			}

 			let weight_processed = if status[index].2.is_empty() {
-				debug_assert!(false, "channel exists in status; there must be messages; qed");
+				debug_assert!(
+					false,
+					"channel exists in status; there must be messages; qed"
+				);
 				0
 			} else {
 				// Process up to one block's worth for now.
 				let weight_remaining = weight_available.saturating_sub(weight_used);
-				let (weight_processed, is_empty) = Self::process_xcmp_message(
-					sender,
-					status[index].2[0],
-					weight_remaining,
-				);
+				let (weight_processed, is_empty) =
+					Self::process_xcmp_message(sender, status[index].2[0], weight_remaining);
 				if is_empty {
 					status[index].2.remove(0);
 				}
@@ -493,20 +537,26 @@ impl<T: Config> Module<T> {
 			};
 			weight_used += weight_processed;

-			if status[index].2.len() as u32 <= resume_threshold && status[index].1 == InboundStatus::Suspended {
+			if status[index].2.len() as u32 <= resume_threshold
+				&& status[index].1 == InboundStatus::Suspended
+			{
 				// Resume
 				let r = Self::send_signal(sender, ChannelSignal::Resume);
-				debug_assert!(r.is_ok(), "WARNING: Failed sending resume into suspended channel");
+				debug_assert!(
+					r.is_ok(),
+					"WARNING: Failed sending resume into suspended channel"
+				);
 				status[index].1 = InboundStatus::Ok;
 			}

 			// If there are more and we're making progress, we process them after we've given the
 			// other channels a look in. If we've still not unlocked all weight, then we set them
 			// up for processing a second time anyway.
-			if !status[index].2.is_empty() && weight_processed > 0 || weight_available != max_weight {
+			if !status[index].2.is_empty() && weight_processed > 0 || weight_available != max_weight
+			{
 				if shuffle_index + 1 == shuffled.len() {
 					// Only this queue left. Just run around this loop once more.
-					continue
+					continue;
 				}
 				shuffled.push(index);
 			}
@@ -516,12 +566,12 @@ impl<T: Config> Module<T> {
 		// Only retain the senders that have non-empty queues.
 		status.retain(|item| !item.2.is_empty());

-		InboundXcmpStatus::put(status);
+		<InboundXcmpStatus<T>>::put(status);
 		weight_used
 	}

 	fn suspend_channel(target: ParaId) {
-		OutboundXcmpStatus::mutate(|s| {
+		<OutboundXcmpStatus<T>>::mutate(|s| {
 			if let Some(index) = s.iter().position(|item| item.0 == target) {
 				let ok = s[index].1 == OutboundStatus::Ok;
 				debug_assert!(ok, "WARNING: Attempt to suspend channel that was not Ok.");
@@ -533,41 +583,53 @@ impl<T: Config> Module<T> {
 	}

 	fn resume_channel(target: ParaId) {
-		OutboundXcmpStatus::mutate(|s| {
+		<OutboundXcmpStatus<T>>::mutate(|s| {
 			if let Some(index) = s.iter().position(|item| item.0 == target) {
 				let suspended = s[index].1 == OutboundStatus::Suspended;
-				debug_assert!(suspended, "WARNING: Attempt to resume channel that was not suspended.");
+				debug_assert!(
+					suspended,
+					"WARNING: Attempt to resume channel that was not suspended."
+				);
 				if s[index].3 == s[index].4 {
 					s.remove(index);
 				} else {
 					s[index].1 = OutboundStatus::Ok;
 				}
 			} else {
-				debug_assert!(false, "WARNING: Attempt to resume channel that was not suspended.");
+				debug_assert!(
+					false,
+					"WARNING: Attempt to resume channel that was not suspended."
+				);
 			}
 		});
 	}
 }

-impl<T: Config> XcmpMessageHandler for Module<T> {
-	fn handle_xcmp_messages<'a, I: Iterator<Item=(ParaId, RelayBlockNumber, &'a [u8])>>(
+impl<T: Config> XcmpMessageHandler for Pallet<T> {
+	fn handle_xcmp_messages<'a, I: Iterator<Item = (ParaId, RelayBlockNumber, &'a [u8])>>(
 		iter: I,
 		max_weight: Weight,
 	) -> Weight {
-		let mut status = InboundXcmpStatus::get();
+		let mut status = <InboundXcmpStatus<T>>::get();

-		let QueueConfigData { suspend_threshold, drop_threshold, .. } = QueueConfig::get();
+		let QueueConfigData {
+			suspend_threshold,
+			drop_threshold,
+			..
+		} = <QueueConfig<T>>::get();

 		for (sender, sent_at, data) in iter {
-
 			// Figure out the message format.
 			let mut data_ref = data;
 			let format = match XcmpMessageFormat::decode(&mut data_ref) {
 				Ok(f) => f,
 				Err(_) => {
-					debug_assert!(false, "Unknown XCMP message format. Silently dropping message");
-					continue
-				},
+					debug_assert!(
+						false,
+						"Unknown XCMP message format. Silently dropping message"
+					);
+					continue;
+				}
 			};
 			if format == XcmpMessageFormat::Signals {
 				while !data_ref.is_empty() {
@@ -587,34 +649,39 @@ impl<T: Config> XcmpMessageHandler for Module<T> {
 							status[i].1 = InboundStatus::Suspended;
 							let r = Self::send_signal(sender, ChannelSignal::Suspend);
 							if r.is_err() {
-								log::warn!("Attempt to suspend channel failed. Messages may be dropped.");
+								log::warn!(
+									"Attempt to suspend channel failed. Messages may be dropped."
+								);
 							}
 						}
 						if (count as u32) < drop_threshold {
 							status[i].2.push((sent_at, format));
 						} else {
-							debug_assert!(false, "XCMP channel queue full. Silently dropping message");
+							debug_assert!(
+								false,
+								"XCMP channel queue full. Silently dropping message"
+							);
 						}
-					},
+					}
 					Err(_) => status.push((sender, InboundStatus::Ok, vec![(sent_at, format)])),
 				}
 				// Queue the payload for later execution.
-				InboundXcmpMessages::insert(sender, sent_at, data_ref);
+				<InboundXcmpMessages<T>>::insert(sender, sent_at, data_ref);
 			}

 			// Optimization note; it would make sense to execute messages immediately if
 			// `status.is_empty()` here.
 		}
 		status.sort();
-		InboundXcmpStatus::put(status);
+		<InboundXcmpStatus<T>>::put(status);

 		Self::service_xcmp_queue(max_weight)
 	}
 }

-impl<T: Config> XcmpMessageSource for Module<T> {
+impl<T: Config> XcmpMessageSource for Pallet<T> {
 	fn take_outbound_messages(maximum_channels: usize) -> Vec<(ParaId, Vec<u8>)> {
-		let mut statuses = OutboundXcmpStatus::get();
+		let mut statuses = <OutboundXcmpStatus<T>>::get();
 		let old_statuses_len = statuses.len();
 		let max_message_count = statuses.len().min(maximum_channels);
 		let mut result = Vec::with_capacity(max_message_count);
@@ -628,42 +695,42 @@ impl<T: Config> XcmpMessageSource for Module<T> {
 				break;
 			}
 			if outbound_status == OutboundStatus::Suspended {
-				continue
+				continue;
 			}
 			let (max_size_now, max_size_ever) = match T::ChannelInfo::get_channel_status(para_id) {
 				ChannelStatus::Closed => {
 					// This means that there is no such channel anymore. Nothing to be done but
 					// swallow the messages and discard the status.
 					for i in begin..end {
-						OutboundXcmpMessages::remove(para_id, i);
+						<OutboundXcmpMessages<T>>::remove(para_id, i);
 					}
 					if signalling {
-						SignalMessages::remove(para_id);
+						<SignalMessages<T>>::remove(para_id);
 					}
 					*status = (para_id, OutboundStatus::Ok, false, 0, 0);
-					continue
+					continue;
 				}
 				ChannelStatus::Full => continue,
 				ChannelStatus::Ready(n, e) => (n, e),
 			};

 			let page = if signalling {
-				let page = SignalMessages::get(para_id);
+				let page = <SignalMessages<T>>::get(para_id);
 				if page.len() < max_size_now {
-					SignalMessages::remove(para_id);
+					<SignalMessages<T>>::remove(para_id);
 					signalling = false;
 					page
 				} else {
-					continue
+					continue;
 				}
 			} else if end > begin {
-				let page = OutboundXcmpMessages::get(para_id, begin);
+				let page = <OutboundXcmpMessages<T>>::get(para_id, begin);
 				if page.len() < max_size_now {
-					OutboundXcmpMessages::remove(para_id, begin);
+					<OutboundXcmpMessages<T>>::remove(para_id, begin);
 					begin += 1;
 					page
 				} else {
-					continue
+					continue;
 				}
 			} else {
 				continue;
@@ -705,23 +772,27 @@ impl<T: Config> XcmpMessageSource for Module<T> {
 		// be no less than the pruned channels.
 		statuses.rotate_left(result.len() - pruned);

-		OutboundXcmpStatus::put(statuses);
+		<OutboundXcmpStatus<T>>::put(statuses);

 		result
 	}
 }

 /// Xcm sender for sending to a sibling parachain.
-impl<T: Config> SendXcm for Module<T> {
+impl<T: Config> SendXcm for Pallet<T> {
 	fn send_xcm(dest: MultiLocation, msg: Xcm<()>) -> Result<(), XcmError> {
 		match &dest {
 			// An HRMP message for a sibling parachain.
 			MultiLocation::X2(Junction::Parent, Junction::Parachain(id)) => {
 				let msg = VersionedXcm::<()>::from(msg);
 				let hash = T::Hashing::hash_of(&msg);
-				Self::send_fragment((*id).into(), XcmpMessageFormat::ConcatenatedVersionedXcm, msg)
-					.map_err(|e| XcmError::SendFailed(<&'static str>::from(e)))?;
-				Self::deposit_event(RawEvent::XcmpMessageSent(Some(hash)));
+				Self::send_fragment(
+					(*id).into(),
+					XcmpMessageFormat::ConcatenatedVersionedXcm,
+					msg,
+				)
+				.map_err(|e| XcmError::SendFailed(<&'static str>::from(e)))?;
+				Self::deposit_event(Event::XcmpMessageSent(Some(hash)));
 				Ok(())
 			}
 			// Anything else is unhandled. This includes a message this is meant for us.