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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/>.
//! Types and functions intended to ease adding of new Substrate -> Substrate
//! finality proofs synchronization pipelines.
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use crate::{
finality_source::SubstrateFinalitySource, finality_target::SubstrateFinalityTarget,
TransactionParams,
};
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use async_trait::async_trait;
use bp_header_chain::justification::GrandpaJustification;
use finality_relay::FinalitySyncPipeline;
use pallet_bridge_grandpa::{Call as BridgeGrandpaCall, Config as BridgeGrandpaConfig};
transaction_stall_timeout, AccountIdOf, AccountKeyPairOf, BlockNumberOf, CallOf, Chain, Client,
HashOf, HeaderOf, SyncHeader, TransactionSignScheme,
use relay_utils::metrics::MetricsParams;
use sp_core::Pair;
use std::{fmt::Debug, marker::PhantomData};
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/// Default limit of recent finality proofs.
///
/// Finality delay of 4096 blocks is unlikely to happen in practice in
/// Substrate+GRANDPA based chains (good to know).
pub(crate) const RECENT_FINALITY_PROOFS_LIMIT: usize = 4096;
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/// Substrate -> Substrate finality proofs synchronization pipeline.
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#[async_trait]
pub trait SubstrateFinalitySyncPipeline: 'static + Clone + Debug + Send + Sync {
/// Headers of this chain are submitted to the `TargetChain`.
type SourceChain: Chain;
/// Headers of the `SourceChain` are submitted to this chain.
/// How submit finality proof call is built?
type SubmitFinalityProofCallBuilder: SubmitFinalityProofCallBuilder<Self>;
/// Scheme used to sign target chain transactions.
type TransactionSignScheme: TransactionSignScheme;
/// Add relay guards if required.
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async fn start_relay_guards(
_target_client: &Client<Self::TargetChain>,
_transaction_params: &TransactionParams<AccountKeyPairOf<Self::TransactionSignScheme>>,
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_enable_version_guard: bool,
) -> relay_substrate_client::Result<()> {
Ok(())
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}
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/// Adapter that allows all `SubstrateFinalitySyncPipeline` to act as `FinalitySyncPipeline`.
#[derive(Clone, Debug)]
pub(crate) struct FinalitySyncPipelineAdapter<P: SubstrateFinalitySyncPipeline> {
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}
impl<P: SubstrateFinalitySyncPipeline> FinalitySyncPipeline for FinalitySyncPipelineAdapter<P> {
const SOURCE_NAME: &'static str = P::SourceChain::NAME;
const TARGET_NAME: &'static str = P::TargetChain::NAME;
type Hash = HashOf<P::SourceChain>;
type Number = BlockNumberOf<P::SourceChain>;
type Header = relay_substrate_client::SyncHeader<HeaderOf<P::SourceChain>>;
type FinalityProof = GrandpaJustification<HeaderOf<P::SourceChain>>;
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}
/// Different ways of building `submit_finality_proof` calls.
pub trait SubmitFinalityProofCallBuilder<P: SubstrateFinalitySyncPipeline> {
/// Given source chain header and its finality proofs, build call of `submit_finality_proof`
/// function of bridge GRANDPA module at the target chain.
fn build_submit_finality_proof_call(
header: SyncHeader<HeaderOf<P::SourceChain>>,
proof: GrandpaJustification<HeaderOf<P::SourceChain>>,
) -> CallOf<P::TargetChain>;
/// Building `submit_finality_proof` call when you have direct access to the target
/// chain runtime.
pub struct DirectSubmitFinalityProofCallBuilder<P, R, I> {
_phantom: PhantomData<(P, R, I)>,
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}
impl<P, R, I> SubmitFinalityProofCallBuilder<P> for DirectSubmitFinalityProofCallBuilder<P, R, I>
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where
P: SubstrateFinalitySyncPipeline,
R: BridgeGrandpaConfig<I>,
I: 'static,
R::BridgedChain: bp_runtime::Chain<Header = HeaderOf<P::SourceChain>>,
CallOf<P::TargetChain>: From<BridgeGrandpaCall<R, I>>,
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{
fn build_submit_finality_proof_call(
header: SyncHeader<HeaderOf<P::SourceChain>>,
proof: GrandpaJustification<HeaderOf<P::SourceChain>>,
) -> CallOf<P::TargetChain> {
BridgeGrandpaCall::<R, I>::submit_finality_proof {
finality_target: Box::new(header.into_inner()),
justification: proof,
}
.into()
}
}
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/// Macro that generates `SubmitFinalityProofCallBuilder` implementation for the case when
/// you only have an access to the mocked version of target chain runtime. In this case you
/// should provide "name" of the call variant for the bridge GRANDPA calls and the "name" of
/// the variant for the `submit_finality_proof` call within that first option.
#[rustfmt::skip]
#[macro_export]
macro_rules! generate_mocked_submit_finality_proof_call_builder {
($pipeline:ident, $mocked_builder:ident, $bridge_grandpa:path, $submit_finality_proof:path) => {
pub struct $mocked_builder;
impl $crate::finality_pipeline::SubmitFinalityProofCallBuilder<$pipeline>
for $mocked_builder
{
fn build_submit_finality_proof_call(
header: relay_substrate_client::SyncHeader<
relay_substrate_client::HeaderOf<
<$pipeline as $crate::finality_pipeline::SubstrateFinalitySyncPipeline>::SourceChain
>
>,
proof: bp_header_chain::justification::GrandpaJustification<
relay_substrate_client::HeaderOf<
<$pipeline as $crate::finality_pipeline::SubstrateFinalitySyncPipeline>::SourceChain
>
>,
) -> relay_substrate_client::CallOf<
<$pipeline as $crate::finality_pipeline::SubstrateFinalitySyncPipeline>::TargetChain
> {
$bridge_grandpa($submit_finality_proof(Box::new(header.into_inner()), proof))
}
}
};
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}
/// Run Substrate-to-Substrate finality sync loop.
pub async fn run<P: SubstrateFinalitySyncPipeline>(
source_client: Client<P::SourceChain>,
target_client: Client<P::TargetChain>,
only_mandatory_headers: bool,
transaction_params: TransactionParams<AccountKeyPairOf<P::TransactionSignScheme>>,
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metrics_params: MetricsParams,
AccountIdOf<P::TargetChain>: From<<AccountKeyPairOf<P::TransactionSignScheme> as Pair>::Public>,
P::TransactionSignScheme: TransactionSignScheme<Chain = P::TargetChain>,
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{
log::info!(
target: "bridge",
"Starting {} -> {} finality proof relay",
P::SourceChain::NAME,
P::TargetChain::NAME,
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);
finality_relay::run(
SubstrateFinalitySource::<P>::new(source_client, None),
SubstrateFinalityTarget::<P>::new(target_client, transaction_params.clone()),
finality_relay::FinalitySyncParams {
P::SourceChain::AVERAGE_BLOCK_INTERVAL,
P::TargetChain::AVERAGE_BLOCK_INTERVAL,
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recent_finality_proofs_limit: RECENT_FINALITY_PROOFS_LIMIT,
stall_timeout: transaction_stall_timeout(
transaction_params.mortality,
P::TargetChain::AVERAGE_BLOCK_INTERVAL,
crate::STALL_TIMEOUT,
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},
metrics_params,
futures::future::pending(),
.map_err(|e| anyhow::format_err!("{}", e))