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// Copyright (C) Parity Technologies (UK) Ltd.
// SPDX-License-Identifier: Apache-2.0
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
use crate::{pallet, OutboundState};
use cumulus_primitives_core::ParaId;
use xcm::latest::prelude::*;
/// Adapter implementation for `bp_xcm_bridge_hub_router::XcmChannelStatusProvider` which checks
/// both `OutboundXcmpStatus` and `InboundXcmpStatus` for defined `Location` if any of those is
/// suspended.
pub struct InAndOutXcmpChannelStatusProvider<Runtime>(core::marker::PhantomData<Runtime>);
impl<Runtime: crate::Config> bp_xcm_bridge_hub_router::XcmChannelStatusProvider
for InAndOutXcmpChannelStatusProvider<Runtime>
{
fn is_congested(with: &Location) -> bool {
// handle congestion only for a sibling parachain locations.
let sibling_para_id: ParaId = match with.unpack() {
(_, [Parachain(para_id)]) => (*para_id).into(),
_ => return false,
};
// if the inbound channel with recipient is suspended, it means that we are unable to
// receive congestion reports from the `with` location. So we assume the pipeline is
// congested too.
if pallet::Pallet::<Runtime>::is_inbound_channel_suspended(sibling_para_id) {
return true
}
// if the outbound channel with recipient is suspended, it means that one of further
// queues (e.g. bridge queue between two bridge hubs) is overloaded, so we shall
// take larger fee for our outbound messages
OutXcmpChannelStatusProvider::<Runtime>::is_congested(with)
}
}
/// Adapter implementation for `bp_xcm_bridge_hub_router::XcmChannelStatusProvider` which checks
/// only `OutboundXcmpStatus` for defined `SiblingParaId` if is suspended.
pub struct OutXcmpChannelStatusProvider<Runtime>(core::marker::PhantomData<Runtime>);
impl<Runtime: crate::Config> bp_xcm_bridge_hub_router::XcmChannelStatusProvider
for OutXcmpChannelStatusProvider<Runtime>
{
fn is_congested(with: &Location) -> bool {
// handle congestion only for a sibling parachain locations.
let sibling_para_id: ParaId = match with.unpack() {
(_, [Parachain(para_id)]) => (*para_id).into(),
_ => return false,
};
// let's find the channel's state with the sibling parachain,
let Some((outbound_state, queued_pages)) =
pallet::Pallet::<Runtime>::outbound_channel_state(sibling_para_id)
else {
return false
};
// suspended channel => it is congested
if outbound_state == OutboundState::Suspended {
return true
}
// It takes some time for target parachain to suspend inbound channel with the target BH and
// during that we will keep accepting new message delivery transactions. Let's also reject
// new deliveries if there are too many "pages" (concatenated XCM messages) in the target BH
// -> target parachain queue.
// If the outbound channel has at least `N` pages enqueued, let's assume it is congested.
// Normally, the chain with a few opened HRMP channels, will "send" pages at every block.
// Having `N` pages means that for last `N` blocks we either have not sent any messages,
// or have sent signals.
const MAX_QUEUED_PAGES_BEFORE_DEACTIVATION: u16 = 4;
if queued_pages > MAX_QUEUED_PAGES_BEFORE_DEACTIVATION {
return true
}
false
}
}
#[cfg(feature = "runtime-benchmarks")]
pub fn suspend_channel_for_benchmarks<T: crate::Config>(target: ParaId) {
pallet::Pallet::<T>::suspend_channel(target)
}