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Introduce message broker for receiving and sending relay chain messag…
…es (paritytech#80) * Start message broker implementation * Finish first stub implementation * Add features * Fix attribute * Update primitives/src/lib.rs Co-Authored-By: Joshy Orndorff <JoshOrndorff@users.noreply.github.com> Co-authored-by: Joshy Orndorff <JoshOrndorff@users.noreply.github.com>
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[package] | ||
name = "cumulus-message-broker" | ||
version = "0.1.0" | ||
authors = ["Parity Technologies <admin@parity.io>"] | ||
edition = "2018" | ||
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[dependencies] | ||
# substrate deps | ||
frame-support = { git = "https://github.com/paritytech/substrate", branch = "cumulus-branch" } | ||
frame-system = { git = "https://github.com/paritytech/substrate", branch = "cumulus-branch" } | ||
sp-inherents = { git = "https://github.com/paritytech/substrate", branch = "cumulus-branch" } | ||
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# Other dependencies | ||
codec = { package = "parity-scale-codec", version = "1.3.0", features = [ "derive" ] } | ||
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# Cumulus dependencies | ||
cumulus-primitives = { path = "../primitives" } | ||
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[features] | ||
default = [ "std" ] | ||
std = [ | ||
"frame-support/std", | ||
"frame-system/std", | ||
"sp-inherents/std", | ||
"codec/std", | ||
"cumulus-primitives/std", | ||
] |
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// Copyright 2020 Parity Technologies (UK) Ltd. | ||
// This file is part of Cumulus. | ||
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// Substrate 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. | ||
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// Substrate 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. | ||
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// You should have received a copy of the GNU General Public License | ||
// along with Cumulus. If not, see <http://www.gnu.org/licenses/>. | ||
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//! Cumulus message broker pallet. | ||
//! | ||
//! 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::{ | ||
inherents::{DownwardMessagesType, DOWNWARD_MESSAGES_IDENTIFIER}, | ||
well_known_keys, DownwardMessageHandler, UpwardMessageSender, | ||
}; | ||
use frame_support::{ | ||
decl_module, storage, | ||
weights::{SimpleDispatchInfo, WeighData, Weight}, | ||
}; | ||
use frame_system::ensure_none; | ||
use sp_inherents::{InherentData, InherentIdentifier, MakeFatalError, ProvideInherent}; | ||
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/// Configuration trait of this pallet. | ||
pub trait Trait: frame_system::Trait { | ||
/// The downward message handlers that will be informed when a message is received. | ||
type DownwardMessageHandlers: DownwardMessageHandler; | ||
} | ||
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decl_module! { | ||
pub struct Module<T: Trait> for enum Call where origin: T::Origin { | ||
/// Executes the given downward messages by calling the message handlers. | ||
/// | ||
/// The origin of this call needs to be `None` as this is an inherent. | ||
#[weight = SimpleDispatchInfo::FixedMandatory(10)] | ||
fn execute_downward_messages(origin, messages: Vec<()>) { | ||
ensure_none(origin)?; | ||
messages.iter().for_each(T::DownwardMessageHandlers::handle_downward_message); | ||
} | ||
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fn on_initialize() -> Weight { | ||
storage::unhashed::kill(well_known_keys::UPWARD_MESSAGES); | ||
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SimpleDispatchInfo::default().weigh_data(()) | ||
} | ||
} | ||
} | ||
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impl<T: Trait> UpwardMessageSender for Module<T> { | ||
fn send_upward_message(_: &()) -> Result<(), ()> { | ||
Ok(()) | ||
} | ||
} | ||
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impl<T: Trait> ProvideInherent for Module<T> { | ||
type Call = Call<T>; | ||
type Error = MakeFatalError<()>; | ||
const INHERENT_IDENTIFIER: InherentIdentifier = DOWNWARD_MESSAGES_IDENTIFIER; | ||
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fn create_inherent(data: &InherentData) -> Option<Self::Call> { | ||
data.get_data::<DownwardMessagesType>(&DOWNWARD_MESSAGES_IDENTIFIER) | ||
.expect("Downward messages inherent data failed to decode") | ||
.map(|msgs| Call::execute_downward_messages(msgs)) | ||
} | ||
} |
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[package] | ||
name = "cumulus-primitives" | ||
version = "0.1.0" | ||
authors = ["Parity Technologies <admin@parity.io>"] | ||
edition = "2018" | ||
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[dependencies] | ||
# Substrate dependencies | ||
sp-inherents = { git = "https://github.com/paritytech/substrate", branch = "cumulus-branch" } | ||
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# Other dependencies | ||
impl-trait-for-tuples = "0.1.3" | ||
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[features] | ||
default = [ "std" ] | ||
std = [ | ||
"sp-inherents/std", | ||
] |
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// Copyright 2020 Parity Technologies (UK) Ltd. | ||
// This file is part of Cumulus. | ||
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// Substrate 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. | ||
|
||
// Substrate 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. | ||
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// You should have received a copy of the GNU General Public License | ||
// along with Cumulus. If not, see <http://www.gnu.org/licenses/>. | ||
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//! Cumulus related primitive types and traits. | ||
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#![cfg_attr(not(feature = "std"), no_std)] | ||
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/// Identifiers and types related to Cumulus Inherents | ||
pub mod inherents { | ||
use sp_inherents::InherentIdentifier; | ||
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/// Inherent identifier for downward messages. | ||
pub const DOWNWARD_MESSAGES_IDENTIFIER: InherentIdentifier = *b"cumdownm"; | ||
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/// The type of the inherent downward messages. | ||
pub type DownwardMessagesType = Vec<()>; | ||
} | ||
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/// Well known keys for values in the storage. | ||
pub mod well_known_keys { | ||
/// The storage key for the upward messages. | ||
/// | ||
/// The upward messages are stored as SCALE encoded `Vec<()>`. | ||
pub const UPWARD_MESSAGES: &'static [u8] = b":cumulus_upward_messages:"; | ||
} | ||
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/// Something that should be called when a downward message is received. | ||
#[impl_trait_for_tuples::impl_for_tuples(30)] | ||
pub trait DownwardMessageHandler { | ||
/// Handle the given downward message. | ||
fn handle_downward_message(msg: &()); | ||
} | ||
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/// Something that can send upward messages. | ||
pub trait UpwardMessageSender { | ||
/// Send an upward message to the relay chain. | ||
/// | ||
/// Returns an error if sending failed. | ||
fn send_upward_message(msg: &()) -> Result<(), ()>; | ||
} |
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