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// Copyright 2021 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/>.
use parity_scale_codec::Encode;
use runtime_parachains::{configuration, dmp};
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use xcm::latest::prelude::*;
/// XCM sender for relay chain. It only sends downward message.
impl<T: configuration::Config + dmp::Config, W: xcm::WrapVersion> SendXcm
for ChildParachainRouter<T, W>
{
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fn send_xcm(dest: MultiLocation, msg: Xcm<()>) -> SendResult {
match dest {
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MultiLocation { parents: 0, interior: X1(Parachain(id)) } => {
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W::wrap_version(&dest, msg).map_err(|()| SendError::DestinationUnsupported)?;
let config = <configuration::Pallet<T>>::config();
<dmp::Pallet<T>>::queue_downward_message(
id.into(),
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.map_err(Into::<SendError>::into)?;
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dest => Err(SendError::CannotReachDestination(dest, msg)),