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Svyatoslav Nikolsky
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// Copyright 2019-2020 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/>.
//! Substrate client as Substrate finality proof target. The chain we connect to should have
//! runtime that implements `<BridgedChainName>FinalityApi` to allow bridging with
//! <BridgedName> chain.
use crate::finality_pipeline::SubstrateFinalitySyncPipeline;
use async_trait::async_trait;
use codec::{Decode, Encode};
use finality_relay::TargetClient;
use futures::TryFutureExt;
use relay_substrate_client::{Chain, Client, Error as SubstrateError};
use relay_utils::relay_loop::Client as RelayClient;
use sp_core::Bytes;
/// Substrate client as Substrate finality target.
pub struct SubstrateFinalityTarget<C: Chain, P> {
client: Client<C>,
pipeline: P,
}
impl<C: Chain, P> SubstrateFinalityTarget<C, P> {
/// Create new Substrate headers target.
pub fn new(client: Client<C>, pipeline: P) -> Self {
SubstrateFinalityTarget { client, pipeline }
}
}
impl<C: Chain, P: SubstrateFinalitySyncPipeline> Clone for SubstrateFinalityTarget<C, P> {
fn clone(&self) -> Self {
SubstrateFinalityTarget {
client: self.client.clone(),
pipeline: self.pipeline.clone(),
}
}
}
#[async_trait]
impl<C: Chain, P: SubstrateFinalitySyncPipeline> RelayClient for SubstrateFinalityTarget<C, P> {
type Error = SubstrateError;
async fn reconnect(&mut self) -> Result<(), SubstrateError> {
self.client.reconnect().await
}
}
#[async_trait]
impl<C, P> TargetClient<P> for SubstrateFinalityTarget<C, P>
where
C: Chain,
P::Number: Decode,
P::Hash: Decode,
P: SubstrateFinalitySyncPipeline,
{
async fn best_finalized_source_block_number(&self) -> Result<P::Number, SubstrateError> {
// we can't continue to relay finality if target node is out of sync, because
// it may have already received (some of) headers that we're going to relay
self.client.ensure_synced().await?;
Ok(crate::messages_source::read_client_state::<C, P::Hash, P::Number>(
&self.client,
P::BEST_FINALIZED_SOURCE_HEADER_ID_AT_TARGET,
)
.await?
.best_finalized_peer_at_best_self
.0)
}
async fn submit_finality_proof(&self, header: P::Header, proof: P::FinalityProof) -> Result<(), SubstrateError> {
self.pipeline
.make_submit_finality_proof_transaction(header, proof)
.and_then(|tx| self.client.submit_extrinsic(Bytes(tx.encode())))
.await
.map(drop)
}
}