mirror of
https://github.com/pezkuwichain/pezkuwi-subxt.git
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Cecile Tonglet
76 lines
2.6 KiB
Rust
76 lines
2.6 KiB
Rust
// Copyright 2020 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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//! Cumulus message broker pallet.
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//!
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//! This pallet provides support for handling downward and upward messages.
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#![cfg_attr(not(feature = "std"), no_std)]
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use cumulus_primitives::{
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inherents::{DownwardMessagesType, DOWNWARD_MESSAGES_IDENTIFIER},
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well_known_keys, DownwardMessageHandler, UpwardMessageSender,
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};
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use frame_support::{
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decl_module, storage,
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weights::{MINIMUM_WEIGHT, SimpleDispatchInfo, WeighData, Weight},
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};
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use frame_system::ensure_none;
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use sp_inherents::{InherentData, InherentIdentifier, MakeFatalError, ProvideInherent};
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/// Configuration trait of this pallet.
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pub trait Trait: frame_system::Trait {
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/// The downward message handlers that will be informed when a message is received.
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type DownwardMessageHandlers: DownwardMessageHandler;
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}
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decl_module! {
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pub struct Module<T: Trait> for enum Call where origin: T::Origin {
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/// Executes the given downward messages by calling the message handlers.
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///
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/// The origin of this call needs to be `None` as this is an inherent.
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#[weight = SimpleDispatchInfo::FixedMandatory(10)]
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fn execute_downward_messages(origin, messages: Vec<()>) {
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ensure_none(origin)?;
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messages.iter().for_each(T::DownwardMessageHandlers::handle_downward_message);
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}
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fn on_initialize() -> Weight {
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storage::unhashed::kill(well_known_keys::UPWARD_MESSAGES);
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SimpleDispatchInfo::FixedNormal(MINIMUM_WEIGHT).weigh_data(())
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}
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}
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}
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impl<T: Trait> UpwardMessageSender for Module<T> {
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fn send_upward_message(_: &()) -> Result<(), ()> {
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Ok(())
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}
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}
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impl<T: Trait> ProvideInherent for Module<T> {
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type Call = Call<T>;
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type Error = MakeFatalError<()>;
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const INHERENT_IDENTIFIER: InherentIdentifier = DOWNWARD_MESSAGES_IDENTIFIER;
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fn create_inherent(data: &InherentData) -> Option<Self::Call> {
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data.get_data::<DownwardMessagesType>(&DOWNWARD_MESSAGES_IDENTIFIER)
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.expect("Downward messages inherent data failed to decode")
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.map(|msgs| Call::execute_downward_messages(msgs))
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}
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}
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