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// Copyright 2019-2021 Parity Technologies (UK) Ltd.
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// 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 finality_relay::{FinalitySyncPipeline, TargetClient};
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use relay_substrate_client::{Chain, Client, Error as SubstrateError};
use relay_utils::relay_loop::Client as RelayClient;
/// Substrate client as Substrate finality target.
pub struct SubstrateFinalityTarget<C: Chain, P> {
client: Client<C>,
pipeline: P,
transactions_mortality: Option<u32>,
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}
impl<C: Chain, P> SubstrateFinalityTarget<C, P> {
/// Create new Substrate headers target.
pub fn new(client: Client<C>, pipeline: P, transactions_mortality: Option<u32>) -> Self {
SubstrateFinalityTarget {
client,
pipeline,
transactions_mortality,
}
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}
}
impl<C: Chain, P: SubstrateFinalitySyncPipeline> Clone for SubstrateFinalityTarget<C, P> {
fn clone(&self) -> Self {
SubstrateFinalityTarget {
client: self.client.clone(),
pipeline: self.pipeline.clone(),
transactions_mortality: self.transactions_mortality,
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}
}
}
#[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::FinalitySyncPipeline> for SubstrateFinalityTarget<C, P>
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where
C: Chain,
P: SubstrateFinalitySyncPipeline<TargetChain = C>,
<P::FinalitySyncPipeline as FinalitySyncPipeline>::Number: Decode,
<P::FinalitySyncPipeline as FinalitySyncPipeline>::Hash: Decode,
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{
async fn best_finalized_source_block_number(
&self,
) -> Result<<P::FinalitySyncPipeline as FinalitySyncPipeline>::Number, SubstrateError> {
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// 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::FinalitySyncPipeline as FinalitySyncPipeline>::Hash,
<P::FinalitySyncPipeline as FinalitySyncPipeline>::Number,
>(&self.client, P::BEST_FINALIZED_SOURCE_HEADER_ID_AT_TARGET)
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.await?
.best_finalized_peer_at_best_self
.0)
}
async fn submit_finality_proof(
&self,
header: <P::FinalitySyncPipeline as FinalitySyncPipeline>::Header,
proof: <P::FinalitySyncPipeline as FinalitySyncPipeline>::FinalityProof,
) -> Result<(), SubstrateError> {
let transactions_author = self.pipeline.transactions_author();
let pipeline = self.pipeline.clone();
let transactions_mortality = self.transactions_mortality;
.submit_signed_extrinsic(transactions_author, move |best_block_id, transaction_nonce| {
pipeline.make_submit_finality_proof_transaction(
relay_substrate_client::TransactionEra::new(
best_block_id.0,
best_block_id.1,
transactions_mortality,
),
transaction_nonce,
header,
proof,
)
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.await
.map(drop)
}
}