mirror of
https://github.com/pezkuwichain/pezkuwi-subxt.git
synced 2026-06-13 21:01:05 +00:00
The great refactor (#325)
* Move pallets to pallets folder and rename them * Move genesis file to service * Rename primitives to primitives-core * Delete cumulus-runtime * Move stuff to client folder and rename
This commit is contained in:
Bastian Köcher
@@ -0,0 +1,571 @@
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// Copyright 2019 Parity Technologies (UK) Ltd.
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// This file is part of Polkadot.
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// Polkadot is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// Polkadot is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with Polkadot. If not, see <http://www.gnu.org/licenses/>.
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//! Parachain specific networking
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//!
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//! Provides a custom block announcement implementation for parachains
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//! that use the relay chain provided consensus. See [`BlockAnnounceValidator`]
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//! and [`WaitToAnnounce`] for more information about this implementation.
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#[cfg(test)]
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mod tests;
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mod wait_on_relay_chain_block;
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use sc_client_api::{Backend, BlockchainEvents};
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use sp_api::ProvideRuntimeApi;
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use sp_blockchain::HeaderBackend;
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use sp_consensus::{
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block_validation::{BlockAnnounceValidator as BlockAnnounceValidatorT, Validation},
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SyncOracle,
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};
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use sp_core::traits::SpawnNamed;
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use sp_runtime::{
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generic::BlockId,
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traits::{Block as BlockT, HashFor, Header as HeaderT},
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};
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use polkadot_node_primitives::{SignedFullStatement, Statement};
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use polkadot_node_subsystem::messages::StatementDistributionMessage;
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use polkadot_overseer::OverseerHandler;
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use polkadot_primitives::v1::{
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Block as PBlock, CandidateReceipt, CompactStatement, Hash as PHash, Id as ParaId,
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OccupiedCoreAssumption, ParachainHost, SignedStatement, SigningContext,
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};
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use polkadot_service::ClientHandle;
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use codec::{Decode, Encode};
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use futures::{
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channel::{mpsc, oneshot},
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future::{ready, FutureExt},
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pin_mut, select, Future, StreamExt,
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};
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use log::trace;
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use std::{convert::TryFrom, fmt, marker::PhantomData, pin::Pin, sync::Arc};
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use wait_on_relay_chain_block::WaitOnRelayChainBlock;
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const LOG_TARGET: &str = "cumulus-network";
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type BoxedError = Box<dyn std::error::Error + Send>;
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#[derive(Debug)]
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struct BlockAnnounceError(String);
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impl std::error::Error for BlockAnnounceError {}
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impl fmt::Display for BlockAnnounceError {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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self.0.fmt(f)
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}
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}
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/// The data that we attach to a block announcement.
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///
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/// This will be used to prove that a header belongs to a block that is probably being backed by
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/// the relay chain.
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#[derive(Encode, Decode, Debug)]
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pub struct BlockAnnounceData {
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receipt: CandidateReceipt,
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statement: SignedStatement,
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}
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impl BlockAnnounceData {
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/// Validate that the receipt, statement and announced header match.
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///
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/// This will not check the signature, for this you should use [`BlockAnnounceData::check_signature`].
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fn validate(&self, encoded_header: Vec<u8>) -> Result<(), Validation> {
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let candidate_hash = if let CompactStatement::Candidate(h) = self.statement.payload() {
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h
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} else {
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log::debug!(
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target: LOG_TARGET,
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"`CompactStatement` isn't the candidate variant!",
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);
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return Err(Validation::Failure { disconnect: true });
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};
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if *candidate_hash != self.receipt.hash() {
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log::debug!(
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target: LOG_TARGET,
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"Receipt candidate hash doesn't match candidate hash in statement",
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);
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return Err(Validation::Failure { disconnect: true });
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}
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if polkadot_parachain::primitives::HeadData(encoded_header).hash()
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!= self.receipt.descriptor.para_head
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{
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log::debug!(
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target: LOG_TARGET,
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"Receipt para head hash doesn't match the hash of the header in the block announcement",
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);
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return Err(Validation::Failure { disconnect: true });
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}
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Ok(())
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}
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/// Check the signature of the statement.
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///
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/// Returns an `Err(_)` if it failed.
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fn check_signature<P>(&self, relay_chain_client: &Arc<P>) -> Result<Validation, BlockAnnounceError>
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where
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P: ProvideRuntimeApi<PBlock> + Send + Sync + 'static,
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P::Api: ParachainHost<PBlock>,
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{
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let runtime_api = relay_chain_client.runtime_api();
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let validator_index = self.statement.validator_index();
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let runtime_api_block_id = BlockId::Hash(self.receipt.descriptor.relay_parent);
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let session_index = match runtime_api.session_index_for_child(&runtime_api_block_id) {
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Ok(r) => r,
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Err(e) => {
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return Err(BlockAnnounceError(format!("{:?}", e)));
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}
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};
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let signing_context = SigningContext {
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parent_hash: self.receipt.descriptor.relay_parent,
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session_index,
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};
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// Check that the signer is a legit validator.
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let authorities = match runtime_api.validators(&runtime_api_block_id) {
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Ok(r) => r,
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Err(e) => {
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return Err(BlockAnnounceError(format!("{:?}", e)));
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}
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};
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let signer = match authorities.get(validator_index as usize) {
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Some(r) => r,
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None => {
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log::debug!(
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target: LOG_TARGET,
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"Block announcement justification signer is a validator index out of bound",
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);
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return Ok(Validation::Failure { disconnect: true })
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}
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};
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// Check statement is correctly signed.
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if self
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.statement
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.check_signature(&signing_context, &signer)
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.is_err()
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{
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log::debug!(
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target: LOG_TARGET,
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"Block announcement justification signature is invalid.",
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);
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return Ok(Validation::Failure { disconnect: true });
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}
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Ok(Validation::Success { is_new_best: true })
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}
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}
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impl TryFrom<SignedFullStatement> for BlockAnnounceData {
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type Error = ();
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fn try_from(stmt: SignedFullStatement) -> Result<BlockAnnounceData, ()> {
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let receipt = if let Statement::Seconded(receipt) = stmt.payload() {
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receipt.to_plain()
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} else {
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return Err(());
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};
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Ok(BlockAnnounceData {
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receipt,
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statement: stmt.convert_payload(),
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})
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}
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}
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/// Parachain specific block announce validator.
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///
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/// This block announce validator is required if the parachain is running
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/// with the relay chain provided consensus to make sure each node only
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/// imports a reasonable number of blocks per round. The relay chain provided
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/// consensus doesn't have any authorities and so it could happen that without
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/// this special block announce validator a node would need to import *millions*
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/// of blocks per round, which is clearly not doable.
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///
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/// To solve this problem, each block announcement is delayed until a collator
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/// has received a [`Statement::Seconded`] for its `PoV`. This message tells the
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/// collator that its `PoV` was validated successfully by a parachain validator and
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/// that it is very likely that this `PoV` will be included in the relay chain. Every
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/// collator that doesn't receive the message for its `PoV` will not announce its block.
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/// For more information on the block announcement, see [`WaitToAnnounce`].
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///
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/// For each block announcement that is received, the generic block announcement validation
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/// will call this validator and provides the extra data that was attached to the announcement.
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/// We call this extra data `justification`.
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/// It is expected that the attached data is a SCALE encoded [`BlockAnnounceData`]. The
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/// statement is checked to be a [`CompactStatement::Candidate`] and that it is signed by an active
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/// parachain validator.
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///
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/// If no justification was provided we check if the block announcement is at the tip of the known
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/// chain. If it is at the tip, it is required to provide a justification or otherwise we reject
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/// it. However, if the announcement is for a block below the tip the announcement is accepted
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/// as it probably comes from a node that is currently syncing the chain.
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pub struct BlockAnnounceValidator<Block, P, B, BCE> {
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phantom: PhantomData<Block>,
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relay_chain_client: Arc<P>,
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relay_chain_backend: Arc<B>,
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para_id: ParaId,
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relay_chain_sync_oracle: Box<dyn SyncOracle + Send>,
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wait_on_relay_chain_block: WaitOnRelayChainBlock<B, BCE>,
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}
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impl<Block, P, B, BCE> BlockAnnounceValidator<Block, P, B, BCE> {
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/// Create a new [`BlockAnnounceValidator`].
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pub fn new(
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relay_chain_client: Arc<P>,
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para_id: ParaId,
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relay_chain_sync_oracle: Box<dyn SyncOracle + Send>,
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relay_chain_backend: Arc<B>,
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relay_chain_blockchain_events: Arc<BCE>,
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) -> Self {
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Self {
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phantom: Default::default(),
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relay_chain_client,
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para_id,
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relay_chain_sync_oracle,
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relay_chain_backend: relay_chain_backend.clone(),
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wait_on_relay_chain_block: WaitOnRelayChainBlock::new(
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relay_chain_backend,
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relay_chain_blockchain_events,
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),
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}
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}
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}
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impl<Block: BlockT, P, B, BCE> BlockAnnounceValidator<Block, P, B, BCE>
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where
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P: ProvideRuntimeApi<PBlock> + Send + Sync + 'static,
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P::Api: ParachainHost<PBlock>,
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B: Backend<PBlock> + 'static,
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// Rust bug: https://github.com/rust-lang/rust/issues/24159
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sc_client_api::StateBackendFor<B, PBlock>: sc_client_api::StateBackend<HashFor<PBlock>>,
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{
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/// Handle a block announcement with empty data (no statement) attached to it.
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fn handle_empty_block_announce_data(
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&self,
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header: Block::Header,
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) -> impl Future<Output = Result<Validation, BoxedError>> {
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let relay_chain_client = self.relay_chain_client.clone();
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let relay_chain_backend = self.relay_chain_backend.clone();
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let para_id = self.para_id;
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async move {
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// Check if block is equal or higher than best (this requires a justification)
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let relay_chain_info = relay_chain_backend.blockchain().info();
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let runtime_api_block_id = BlockId::Hash(relay_chain_info.best_hash);
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let block_number = header.number();
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let local_validation_data = relay_chain_client
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.runtime_api()
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.persisted_validation_data(
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&runtime_api_block_id,
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para_id,
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OccupiedCoreAssumption::TimedOut,
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)
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.map_err(|e| Box::new(BlockAnnounceError(format!("{:?}", e))) as Box<_>)?
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.ok_or_else(|| {
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Box::new(BlockAnnounceError(
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"Could not find parachain head in relay chain".into(),
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)) as Box<_>
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})?;
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let parent_head = Block::Header::decode(&mut &local_validation_data.parent_head.0[..])
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.map_err(|e| {
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Box::new(BlockAnnounceError(format!(
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"Failed to decode parachain head: {:?}",
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e
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))) as Box<_>
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})?;
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let known_best_number = parent_head.number();
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if block_number >= known_best_number {
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trace!(
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target: "cumulus-network",
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"validation failed because a justification is needed if the block at the top of the chain."
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);
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Ok(Validation::Failure { disconnect: false })
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} else {
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Ok(Validation::Success { is_new_best: false })
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}
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}
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}
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}
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impl<Block: BlockT, P, B, BCE> BlockAnnounceValidatorT<Block>
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for BlockAnnounceValidator<Block, P, B, BCE>
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where
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P: ProvideRuntimeApi<PBlock> + Send + Sync + 'static,
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P::Api: ParachainHost<PBlock>,
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B: Backend<PBlock> + 'static,
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BCE: BlockchainEvents<PBlock> + 'static + Send + Sync,
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// Rust bug: https://github.com/rust-lang/rust/issues/24159
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sc_client_api::StateBackendFor<B, PBlock>: sc_client_api::StateBackend<HashFor<PBlock>>,
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{
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fn validate(
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&mut self,
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header: &Block::Header,
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mut data: &[u8],
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) -> Pin<Box<dyn Future<Output = Result<Validation, BoxedError>> + Send>> {
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if self.relay_chain_sync_oracle.is_major_syncing() {
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return ready(Ok(Validation::Success { is_new_best: false })).boxed();
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}
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if data.is_empty() {
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return self
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.handle_empty_block_announce_data(header.clone())
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.boxed();
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}
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let block_announce_data = match BlockAnnounceData::decode(&mut data) {
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Ok(r) => r,
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Err(_) => {
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return ready(Err(Box::new(BlockAnnounceError(
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"Can not decode the `BlockAnnounceData`".into(),
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)) as Box<_>))
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.boxed()
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}
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};
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let relay_chain_client = self.relay_chain_client.clone();
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let header_encoded = header.encode();
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let wait_on_relay_chain_block = self.wait_on_relay_chain_block.clone();
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async move {
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if let Err(e) = block_announce_data.validate(header_encoded) {
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return Ok(e);
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}
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let relay_parent = block_announce_data.receipt.descriptor.relay_parent;
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wait_on_relay_chain_block
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.wait_on_relay_chain_block(relay_parent)
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.await
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.map_err(|e| Box::new(BlockAnnounceError(e.to_string())) as Box<_>)?;
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block_announce_data
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.check_signature(&relay_chain_client)
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.map_err(|e| Box::new(e) as Box<_>)
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}
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.boxed()
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}
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}
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/// Build a block announce validator instance.
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///
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/// Returns a boxed [`BlockAnnounceValidator`].
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pub fn build_block_announce_validator<Block: BlockT, B>(
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relay_chain_client: polkadot_service::Client,
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para_id: ParaId,
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relay_chain_sync_oracle: Box<dyn SyncOracle + Send>,
|
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relay_chain_backend: Arc<B>,
|
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) -> Box<dyn BlockAnnounceValidatorT<Block> + Send>
|
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where
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B: Backend<PBlock> + Send + 'static,
|
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// Rust bug: https://github.com/rust-lang/rust/issues/24159
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sc_client_api::StateBackendFor<B, PBlock>: sc_client_api::StateBackend<HashFor<PBlock>>,
|
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{
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BlockAnnounceValidatorBuilder::new(
|
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relay_chain_client,
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para_id,
|
||||
relay_chain_sync_oracle,
|
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relay_chain_backend,
|
||||
)
|
||||
.build()
|
||||
}
|
||||
|
||||
/// Block announce validator builder.
|
||||
///
|
||||
/// Builds a [`BlockAnnounceValidator`] for a parachain. As this requires
|
||||
/// a concrete relay chain client instance, the builder takes a [`polkadot_service::Client`]
|
||||
/// that wraps this concrete instanace. By using [`polkadot_service::ExecuteWithClient`]
|
||||
/// the builder gets access to this concrete instance.
|
||||
struct BlockAnnounceValidatorBuilder<Block, B> {
|
||||
phantom: PhantomData<Block>,
|
||||
relay_chain_client: polkadot_service::Client,
|
||||
para_id: ParaId,
|
||||
relay_chain_sync_oracle: Box<dyn SyncOracle + Send>,
|
||||
relay_chain_backend: Arc<B>,
|
||||
}
|
||||
|
||||
impl<Block: BlockT, B> BlockAnnounceValidatorBuilder<Block, B>
|
||||
where
|
||||
B: Backend<PBlock> + Send + 'static,
|
||||
// Rust bug: https://github.com/rust-lang/rust/issues/24159
|
||||
sc_client_api::StateBackendFor<B, PBlock>: sc_client_api::StateBackend<HashFor<PBlock>>,
|
||||
{
|
||||
/// Create a new instance of the builder.
|
||||
fn new(
|
||||
relay_chain_client: polkadot_service::Client,
|
||||
para_id: ParaId,
|
||||
relay_chain_sync_oracle: Box<dyn SyncOracle + Send>,
|
||||
relay_chain_backend: Arc<B>,
|
||||
) -> Self {
|
||||
Self {
|
||||
relay_chain_client,
|
||||
para_id,
|
||||
relay_chain_sync_oracle,
|
||||
relay_chain_backend,
|
||||
phantom: PhantomData,
|
||||
}
|
||||
}
|
||||
|
||||
/// Build the block announce validator.
|
||||
fn build(self) -> Box<dyn BlockAnnounceValidatorT<Block> + Send> {
|
||||
self.relay_chain_client.clone().execute_with(self)
|
||||
}
|
||||
}
|
||||
|
||||
impl<Block: BlockT, B> polkadot_service::ExecuteWithClient
|
||||
for BlockAnnounceValidatorBuilder<Block, B>
|
||||
where
|
||||
B: Backend<PBlock> + Send + 'static,
|
||||
// Rust bug: https://github.com/rust-lang/rust/issues/24159
|
||||
sc_client_api::StateBackendFor<B, PBlock>: sc_client_api::StateBackend<HashFor<PBlock>>,
|
||||
{
|
||||
type Output = Box<dyn BlockAnnounceValidatorT<Block> + Send>;
|
||||
|
||||
fn execute_with_client<PClient, Api, PBackend>(self, client: Arc<PClient>) -> Self::Output
|
||||
where
|
||||
<Api as sp_api::ApiExt<PBlock>>::StateBackend:
|
||||
sp_api::StateBackend<sp_runtime::traits::BlakeTwo256>,
|
||||
PBackend: Backend<PBlock>,
|
||||
PBackend::State: sp_api::StateBackend<sp_runtime::traits::BlakeTwo256>,
|
||||
Api: polkadot_service::RuntimeApiCollection<StateBackend = PBackend::State>,
|
||||
PClient: polkadot_service::AbstractClient<PBlock, PBackend, Api = Api> + 'static,
|
||||
{
|
||||
Box::new(BlockAnnounceValidator::new(
|
||||
client.clone(),
|
||||
self.para_id,
|
||||
self.relay_chain_sync_oracle,
|
||||
self.relay_chain_backend,
|
||||
client,
|
||||
))
|
||||
}
|
||||
}
|
||||
|
||||
/// Wait before announcing a block that a candidate message has been received for this block, then
|
||||
/// add this message as justification for the block announcement.
|
||||
///
|
||||
/// This object will spawn a new task every time the method `wait_to_announce` is called and cancel
|
||||
/// the previous task running.
|
||||
pub struct WaitToAnnounce<Block: BlockT> {
|
||||
spawner: Arc<dyn SpawnNamed + Send + Sync>,
|
||||
announce_block: Arc<dyn Fn(Block::Hash, Vec<u8>) + Send + Sync>,
|
||||
overseer_handler: OverseerHandler,
|
||||
current_trigger: oneshot::Sender<()>,
|
||||
}
|
||||
|
||||
impl<Block: BlockT> WaitToAnnounce<Block> {
|
||||
/// Create the `WaitToAnnounce` object
|
||||
pub fn new(
|
||||
spawner: Arc<dyn SpawnNamed + Send + Sync>,
|
||||
announce_block: Arc<dyn Fn(Block::Hash, Vec<u8>) + Send + Sync>,
|
||||
overseer_handler: OverseerHandler,
|
||||
) -> WaitToAnnounce<Block> {
|
||||
let (tx, _rx) = oneshot::channel();
|
||||
|
||||
WaitToAnnounce {
|
||||
spawner,
|
||||
announce_block,
|
||||
overseer_handler,
|
||||
current_trigger: tx,
|
||||
}
|
||||
}
|
||||
|
||||
/// Wait for a candidate message for the block, then announce the block. The candidate
|
||||
/// message will be added as justification to the block announcement.
|
||||
pub fn wait_to_announce(&mut self, block_hash: <Block as BlockT>::Hash, pov_hash: PHash) {
|
||||
let (tx, rx) = oneshot::channel();
|
||||
let announce_block = self.announce_block.clone();
|
||||
let overseer_handler = self.overseer_handler.clone();
|
||||
|
||||
self.current_trigger = tx;
|
||||
|
||||
self.spawner.spawn(
|
||||
"cumulus-wait-to-announce",
|
||||
async move {
|
||||
let t1 = wait_to_announce::<Block>(
|
||||
block_hash,
|
||||
pov_hash,
|
||||
announce_block,
|
||||
overseer_handler,
|
||||
)
|
||||
.fuse();
|
||||
let t2 = rx.fuse();
|
||||
|
||||
pin_mut!(t1, t2);
|
||||
|
||||
trace!(
|
||||
target: "cumulus-network",
|
||||
"waiting for announce block in a background task...",
|
||||
);
|
||||
|
||||
select! {
|
||||
_ = t1 => {
|
||||
trace!(
|
||||
target: "cumulus-network",
|
||||
"block announcement finished",
|
||||
);
|
||||
},
|
||||
_ = t2 => {
|
||||
trace!(
|
||||
target: "cumulus-network",
|
||||
"previous task that waits for announce block has been canceled",
|
||||
);
|
||||
}
|
||||
}
|
||||
}
|
||||
.boxed(),
|
||||
);
|
||||
}
|
||||
}
|
||||
|
||||
async fn wait_to_announce<Block: BlockT>(
|
||||
block_hash: <Block as BlockT>::Hash,
|
||||
pov_hash: PHash,
|
||||
announce_block: Arc<dyn Fn(Block::Hash, Vec<u8>) + Send + Sync>,
|
||||
mut overseer_handler: OverseerHandler,
|
||||
) {
|
||||
let (sender, mut receiver) = mpsc::channel(5);
|
||||
overseer_handler
|
||||
.send_msg(StatementDistributionMessage::RegisterStatementListener(
|
||||
sender,
|
||||
))
|
||||
.await;
|
||||
|
||||
while let Some(statement) = receiver.next().await {
|
||||
match statement.payload() {
|
||||
Statement::Seconded(c) if &c.descriptor.pov_hash == &pov_hash => {
|
||||
if let Ok(data) = BlockAnnounceData::try_from(statement) {
|
||||
announce_block(block_hash, data.encode());
|
||||
}
|
||||
|
||||
break;
|
||||
}
|
||||
_ => {}
|
||||
}
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user