mirror of
https://github.com/pezkuwichain/pezkuwi-subxt.git
synced 2026-04-25 21:07:56 +00:00
Keith Yeung
54 lines
2.2 KiB
Rust
54 lines
2.2 KiB
Rust
// Copyright 2020-2021 Parity Technologies (UK) Ltd.
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// This file is part of Cumulus.
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// Substrate is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// Substrate is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with Cumulus. If not, see <http://www.gnu.org/licenses/>.
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//! Helper datatypes for cumulus. This includes the [`ParentAsUmp`] routing type which will route
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//! messages into an [`UpwardMessageSender`] if the destination is `Parent`.
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#![cfg_attr(not(feature = "std"), no_std)]
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use sp_std::marker::PhantomData;
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use codec::Encode;
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use cumulus_primitives_core::UpwardMessageSender;
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use xcm::{WrapVersion, latest::prelude::*};
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/// Xcm router which recognises the `Parent` destination and handles it by sending the message into
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/// the given UMP `UpwardMessageSender` implementation. Thus this essentially adapts an
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/// `UpwardMessageSender` trait impl into a `SendXcm` trait impl.
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///
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/// NOTE: This is a pretty dumb "just send it" router; we will probably want to introduce queuing
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/// to UMP eventually and when we do, the pallet which implements the queuing will be responsible
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/// for the `SendXcm` implementation.
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pub struct ParentAsUmp<T, W>(PhantomData<(T, W)>);
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impl<T: UpwardMessageSender, W: WrapVersion> SendXcm for ParentAsUmp<T, W> {
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fn send_xcm(dest: MultiLocation, msg: Xcm<()>) -> Result<(), XcmError> {
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if dest.contains_parents_only(1) {
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// An upward message for the relay chain.
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let versioned_xcm = W::wrap_version(&dest, msg)
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.map_err(|()| XcmError::DestinationUnsupported)?;
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let data = versioned_xcm.encode();
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T::send_upward_message(data)
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.map_err(|e| XcmError::SendFailed(e.into()))?;
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Ok(())
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} else {
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// Anything else is unhandled. This includes a message this is meant for us.
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Err(XcmError::CannotReachDestination(dest, msg))
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}
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}
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}
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