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// Copyright 2019-2021 Parity Technologies (UK) Ltd.
// This file is part of Parity Bridges Common.
// Parity Bridges Common 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.
// Parity Bridges Common 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 Parity Bridges Common. If not, see <http://www.gnu.org/licenses/>.
//! Parachain heads target.
use crate::TransactionParams;
use async_trait::async_trait;
use bp_parachains::{parachain_head_storage_key_at_target, BestParaHeadHash};
use bp_polkadot_core::parachains::{ParaHeadsProof, ParaId};
use codec::{Decode, Encode};
use pallet_bridge_parachains::{
Call as BridgeParachainsCall, Config as BridgeParachainsConfig, RelayBlockHash,
RelayBlockHasher, RelayBlockNumber,
};
use parachains_relay::{parachains_loop::TargetClient, ParachainsPipeline};
use relay_substrate_client::{
AccountIdOf, AccountKeyPairOf, BlockNumberOf, CallOf, Chain, Client, Error as SubstrateError,
HashOf, HeaderIdOf, SignParam, TransactionEra, TransactionSignScheme, UnsignedTransaction,
};
use relay_utils::{relay_loop::Client as RelayClient, HeaderId};
use sp_core::{Bytes, Pair};
use sp_runtime::traits::Header as HeaderT;
use std::marker::PhantomData;
/// Different ways of building `submit_parachain_heads` calls.
pub trait SubmitParachainHeadsCallBuilder<P: ParachainsPipeline>: 'static + Send + Sync {
/// Given parachains and their heads proof, build call of `submit_parachain_heads`
/// function of bridge parachains module at the target chain.
fn build_submit_parachain_heads_call(
relay_block_hash: HashOf<P::SourceChain>,
parachains: Vec<ParaId>,
parachain_heads_proof: ParaHeadsProof,
) -> CallOf<P::TargetChain>;
}
/// Building `submit_parachain_heads` call when you have direct access to the target
/// chain runtime.
pub struct DirectSubmitParachainHeadsCallBuilder<P, R, I> {
_phantom: PhantomData<(P, R, I)>,
}
impl<P, R, I> SubmitParachainHeadsCallBuilder<P> for DirectSubmitParachainHeadsCallBuilder<P, R, I>
where
P: ParachainsPipeline,
P::SourceChain: Chain<Hash = RelayBlockHash>,
R: BridgeParachainsConfig<I> + Send + Sync,
I: 'static + Send + Sync,
R::BridgedChain: bp_runtime::Chain<
BlockNumber = RelayBlockNumber,
Hash = RelayBlockHash,
Hasher = RelayBlockHasher,
>,
CallOf<P::TargetChain>: From<BridgeParachainsCall<R, I>>,
{
fn build_submit_parachain_heads_call(
relay_block_hash: HashOf<P::SourceChain>,
parachains: Vec<ParaId>,
parachain_heads_proof: ParaHeadsProof,
) -> CallOf<P::TargetChain> {
BridgeParachainsCall::<R, I>::submit_parachain_heads {
relay_block_hash,
parachains,
parachain_heads_proof,
}
.into()
}
}
/// Substrate client as parachain heads source.
pub struct ParachainsTarget<P: ParachainsPipeline, S: TransactionSignScheme, CB> {
client: Client<P::TargetChain>,
transaction_params: TransactionParams<AccountKeyPairOf<S>>,
bridge_paras_pallet_name: String,
_phantom: PhantomData<CB>,
}
impl<P: ParachainsPipeline, S: TransactionSignScheme, CB> ParachainsTarget<P, S, CB> {
/// Creates new parachains target client.
pub fn new(
client: Client<P::TargetChain>,
transaction_params: TransactionParams<AccountKeyPairOf<S>>,
bridge_paras_pallet_name: String,
) -> Self {
ParachainsTarget {
client,
transaction_params,
bridge_paras_pallet_name,
_phantom: Default::default(),
}
}
}
impl<P: ParachainsPipeline, S: TransactionSignScheme, CB> Clone for ParachainsTarget<P, S, CB> {
fn clone(&self) -> Self {
ParachainsTarget {
client: self.client.clone(),
transaction_params: self.transaction_params.clone(),
bridge_paras_pallet_name: self.bridge_paras_pallet_name.clone(),
_phantom: Default::default(),
}
}
}
#[async_trait]
impl<
P: ParachainsPipeline,
S: 'static + TransactionSignScheme,
CB: SubmitParachainHeadsCallBuilder<P>,
> RelayClient for ParachainsTarget<P, S, CB>
{
type Error = SubstrateError;
async fn reconnect(&mut self) -> Result<(), SubstrateError> {
self.client.reconnect().await
}
}
#[async_trait]
impl<P, S, CB> TargetClient<P> for ParachainsTarget<P, S, CB>
where
P: ParachainsPipeline,
S: 'static + TransactionSignScheme<Chain = P::TargetChain>,
CB: SubmitParachainHeadsCallBuilder<P>,
AccountIdOf<P::TargetChain>: From<<AccountKeyPairOf<S> as Pair>::Public>,
{
async fn best_block(&self) -> Result<HeaderIdOf<P::TargetChain>, Self::Error> {
let best_header = self.client.best_header().await?;
let best_hash = best_header.hash();
let best_id = HeaderId(*best_header.number(), best_hash);
Ok(best_id)
}
async fn best_finalized_source_block(
&self,
at_block: &HeaderIdOf<P::TargetChain>,
) -> Result<HeaderIdOf<P::SourceChain>, Self::Error> {
let encoded_best_finalized_source_block = self
.client
.state_call(
P::SourceChain::BEST_FINALIZED_HEADER_ID_METHOD.into(),
Bytes(Vec::new()),
Some(at_block.1),
)
.await?;
let decoded_best_finalized_source_block: (
BlockNumberOf<P::SourceChain>,
HashOf<P::SourceChain>,
) = Decode::decode(&mut &encoded_best_finalized_source_block.0[..])
.map_err(SubstrateError::ResponseParseFailed)?;
Ok(HeaderId(decoded_best_finalized_source_block.0, decoded_best_finalized_source_block.1))
}
async fn parachain_head(
&self,
at_block: HeaderIdOf<P::TargetChain>,
para_id: ParaId,
) -> Result<Option<BestParaHeadHash>, Self::Error> {
let storage_key =
parachain_head_storage_key_at_target(&self.bridge_paras_pallet_name, para_id);
let para_head = self.client.storage_value(storage_key, Some(at_block.1)).await?;
Ok(para_head)
}
async fn submit_parachain_heads_proof(
&self,
at_relay_block: HeaderIdOf<P::SourceChain>,
updated_parachains: Vec<ParaId>,
proof: ParaHeadsProof,
) -> Result<(), Self::Error> {
let genesis_hash = *self.client.genesis_hash();
let transaction_params = self.transaction_params.clone();
let (spec_version, transaction_version) = self.client.simple_runtime_version().await?;
let call =
CB::build_submit_parachain_heads_call(at_relay_block.1, updated_parachains, proof);
self.client
.submit_signed_extrinsic(
self.transaction_params.signer.public().into(),
move |best_block_id, transaction_nonce| {
Ok(Bytes(
S::sign_transaction(SignParam {
spec_version,
transaction_version,
genesis_hash,
signer: transaction_params.signer,
era: TransactionEra::new(best_block_id, transaction_params.mortality),
unsigned: UnsignedTransaction::new(call.into(), transaction_nonce),
})?
.encode(),
))
},
)
.await
.map(drop)
}
}