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// Copyright (C) Parity Technologies (UK) Ltd.
// This file is part of Cumulus.
// Cumulus 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.
// Cumulus 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 Cumulus. If not, see <http://www.gnu.org/licenses/>.
//! Cumulus parachain inherent
//!
//! The [`ParachainInherentData`] is the data that is passed by the collator to the parachain
//! runtime. The runtime will use this data to execute messages from other parachains/the relay
//! chain or to read data from the relay chain state. When the parachain is validated by a parachain
//! validator on the relay chain, this data is checked for correctness. If the data passed by the
//! collator to the runtime isn't correct, the parachain candidate is considered invalid.
//!
//! To create a [`ParachainInherentData`] for a specific relay chain block, there exists the
//! `ParachainInherentDataExt` trait in `cumulus-client-parachain-inherent` that helps with this.
#![cfg_attr(not(feature = "std"), no_std)]
extern crate alloc;
use cumulus_primitives_core::{
relay_chain::{BlakeTwo256, Hash as RelayHash, HashT as _},
InboundDownwardMessage, InboundHrmpMessage, ParaId, PersistedValidationData,
};
use alloc::{collections::btree_map::BTreeMap, vec::Vec};
use scale_info::TypeInfo;
use sp_inherents::InherentIdentifier;
/// The identifier for the parachain inherent.
pub const INHERENT_IDENTIFIER: InherentIdentifier = *b"sysi1337";
/// The inherent data that is passed by the collator to the parachain runtime.
#[derive(codec::Encode, codec::Decode, sp_core::RuntimeDebug, Clone, PartialEq, TypeInfo)]
pub struct ParachainInherentData {
pub validation_data: PersistedValidationData,
/// A storage proof of a predefined set of keys from the relay-chain.
///
/// Specifically this witness contains the data for:
///
/// - the current slot number at the given relay parent
/// - active host configuration as per the relay parent,
/// - the relay dispatch queue sizes
/// - the list of egress HRMP channels (in the list of recipients form)
/// - the metadata for the egress HRMP channels
pub relay_chain_state: sp_trie::StorageProof,
/// Downward messages in the order they were sent.
pub downward_messages: Vec<InboundDownwardMessage>,
/// HRMP messages grouped by channels. The messages in the inner vec must be in order they
/// were sent. In combination with the rule of no more than one message in a channel per block,
/// this means `sent_at` is **strictly** greater than the previous one (if any).
pub horizontal_messages: BTreeMap<ParaId, Vec<InboundHrmpMessage>>,
}
#[cfg(feature = "std")]
#[async_trait::async_trait]
impl sp_inherents::InherentDataProvider for ParachainInherentData {
async fn provide_inherent_data(
&self,
inherent_data: &mut sp_inherents::InherentData,
) -> Result<(), sp_inherents::Error> {
inherent_data.put_data(INHERENT_IDENTIFIER, &self)
}
async fn try_handle_error(
&self,
_: &sp_inherents::InherentIdentifier,
_: &[u8],
) -> Option<Result<(), sp_inherents::Error>> {
None
}
}
/// This struct provides ability to extend a message queue chain (MQC) and compute a new head.
///
/// MQC is an instance of a [hash chain] applied to a message queue. Using a hash chain it's
/// possible to represent a sequence of messages using only a single hash.
///
/// A head for an empty chain is agreed to be a zero hash.
///
/// An instance is used to track either DMP from the relay chain or HRMP across a channel.
/// But a given instance is never used to track both. Therefore, you should call either
/// `extend_downward` or `extend_hrmp`, but not both methods on a single instance.
///
/// [hash chain]: https://en.wikipedia.org/wiki/Hash_chain
#[derive(Default, Clone, codec::Encode, codec::Decode, scale_info::TypeInfo)]
pub struct MessageQueueChain(RelayHash);
impl MessageQueueChain {
/// Create a new instance initialized to `hash`.
pub fn new(hash: RelayHash) -> Self {
Self(hash)
}
/// Extend the hash chain with an HRMP message. This method should be used only when
/// this chain is tracking HRMP.
pub fn extend_hrmp(&mut self, horizontal_message: &InboundHrmpMessage) -> &mut Self {
let prev_head = self.0;
self.0 = BlakeTwo256::hash_of(&(
prev_head,
horizontal_message.sent_at,
BlakeTwo256::hash_of(&horizontal_message.data),
));
self
}
/// Extend the hash chain with a downward message. This method should be used only when
/// this chain is tracking DMP.
pub fn extend_downward(&mut self, downward_message: &InboundDownwardMessage) -> &mut Self {
let prev_head = self.0;
self.0 = BlakeTwo256::hash_of(&(
prev_head,
downward_message.sent_at,
BlakeTwo256::hash_of(&downward_message.msg),
));
self
}
/// Return the current mead of the message queue hash chain.
/// This is agreed to be the zero hash for an empty chain.
pub fn head(&self) -> RelayHash {
self.0
}
}