192380cb58
Updates lighthouse to the latest networking spec - Sync re-write (#496) - Updates to the latest eth2 networking spec (#495) - Libp2p updates and improvements
726 lines
29 KiB
Rust
726 lines
29 KiB
Rust
use super::simple_sync::{PeerSyncInfo, FUTURE_SLOT_TOLERANCE};
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use beacon_chain::{BeaconChain, BeaconChainTypes, BlockProcessingOutcome};
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use eth2_libp2p::rpc::methods::*;
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use eth2_libp2p::rpc::RequestId;
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use eth2_libp2p::PeerId;
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use slog::{debug, info, trace, warn, Logger};
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use std::collections::{HashMap, HashSet};
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use std::ops::{Add, Sub};
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use std::sync::Arc;
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use types::{BeaconBlock, EthSpec, Hash256, Slot};
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const MAX_BLOCKS_PER_REQUEST: u64 = 10;
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/// The number of slots that we can import blocks ahead of us, before going into full Sync mode.
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const SLOT_IMPORT_TOLERANCE: usize = 10;
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const PARENT_FAIL_TOLERANCE: usize = 3;
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const PARENT_DEPTH_TOLERANCE: usize = SLOT_IMPORT_TOLERANCE * 2;
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#[derive(PartialEq)]
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enum BlockRequestsState {
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Queued,
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Pending(RequestId),
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Complete,
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Failed,
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}
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struct BlockRequests<T: EthSpec> {
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target_head_slot: Slot,
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target_head_root: Hash256,
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downloaded_blocks: Vec<BeaconBlock<T>>,
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state: BlockRequestsState,
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/// Specifies whether the current state is syncing forwards or backwards.
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forward_sync: bool,
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/// The current `start_slot` of the batched block request.
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current_start_slot: Slot,
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}
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struct ParentRequests<T: EthSpec> {
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downloaded_blocks: Vec<BeaconBlock<T>>,
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failed_attempts: usize,
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last_submitted_peer: PeerId, // to downvote the submitting peer.
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state: BlockRequestsState,
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}
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impl<T: EthSpec> BlockRequests<T> {
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// gets the start slot for next batch
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// last block slot downloaded plus 1
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fn update_start_slot(&mut self) {
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if self.forward_sync {
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self.current_start_slot += Slot::from(MAX_BLOCKS_PER_REQUEST);
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} else {
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self.current_start_slot -= Slot::from(MAX_BLOCKS_PER_REQUEST);
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}
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self.state = BlockRequestsState::Queued;
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}
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}
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#[derive(PartialEq, Debug, Clone)]
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enum ManagerState {
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Syncing,
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Regular,
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Stalled,
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}
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pub(crate) enum ImportManagerOutcome {
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Idle,
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RequestBlocks {
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peer_id: PeerId,
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request_id: RequestId,
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request: BeaconBlocksRequest,
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},
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/// Updates information with peer via requesting another HELLO handshake.
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Hello(PeerId),
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RecentRequest(PeerId, RecentBeaconBlocksRequest),
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DownvotePeer(PeerId),
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}
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pub struct ImportManager<T: BeaconChainTypes> {
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/// A reference to the underlying beacon chain.
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chain: Arc<BeaconChain<T>>,
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state: ManagerState,
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import_queue: HashMap<PeerId, BlockRequests<T::EthSpec>>,
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parent_queue: Vec<ParentRequests<T::EthSpec>>,
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full_peers: HashSet<PeerId>,
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current_req_id: usize,
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log: Logger,
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}
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impl<T: BeaconChainTypes> ImportManager<T> {
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pub fn new(beacon_chain: Arc<BeaconChain<T>>, log: &slog::Logger) -> Self {
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ImportManager {
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chain: beacon_chain.clone(),
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state: ManagerState::Regular,
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import_queue: HashMap::new(),
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parent_queue: Vec::new(),
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full_peers: HashSet::new(),
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current_req_id: 0,
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log: log.clone(),
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}
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}
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pub fn add_peer(&mut self, peer_id: PeerId, remote: PeerSyncInfo) {
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// TODO: Improve comments.
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// initially try to download blocks from our current head
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// then backwards search all the way back to our finalized epoch until we match on a chain
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// has to be done sequentially to find next slot to start the batch from
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let local = PeerSyncInfo::from(&self.chain);
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// If a peer is within SLOT_IMPORT_TOLERANCE from our head slot, ignore a batch sync
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if remote.head_slot.sub(local.head_slot).as_usize() < SLOT_IMPORT_TOLERANCE {
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trace!(self.log, "Ignoring full sync with peer";
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"peer" => format!("{:?}", peer_id),
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"peer_head_slot" => remote.head_slot,
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"local_head_slot" => local.head_slot,
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);
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// remove the peer from the queue if it exists
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self.import_queue.remove(&peer_id);
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return;
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}
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if let Some(block_requests) = self.import_queue.get_mut(&peer_id) {
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// update the target head slot
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if remote.head_slot > block_requests.target_head_slot {
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block_requests.target_head_slot = remote.head_slot;
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}
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} else {
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let block_requests = BlockRequests {
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target_head_slot: remote.head_slot, // this should be larger than the current head. It is checked in the SyncManager before add_peer is called
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target_head_root: remote.head_root,
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downloaded_blocks: Vec::new(),
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state: BlockRequestsState::Queued,
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forward_sync: true,
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current_start_slot: self.chain.best_slot(),
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};
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self.import_queue.insert(peer_id, block_requests);
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}
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}
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pub fn beacon_blocks_response(
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&mut self,
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peer_id: PeerId,
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request_id: RequestId,
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mut blocks: Vec<BeaconBlock<T::EthSpec>>,
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) {
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// find the request
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let block_requests = match self
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.import_queue
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.get_mut(&peer_id)
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.filter(|r| r.state == BlockRequestsState::Pending(request_id))
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{
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Some(req) => req,
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_ => {
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// No pending request, invalid request_id or coding error
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warn!(self.log, "BeaconBlocks response unknown"; "request_id" => request_id);
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return;
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}
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};
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// If we are syncing up to a target head block, at least the target head block should be
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// returned. If we are syncing back to our last finalized block the request should return
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// at least the last block we received (last known block). In diagram form:
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//
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// unknown blocks requested blocks downloaded blocks
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// |-------------------|------------------------|------------------------|
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// ^finalized slot ^ requested start slot ^ last known block ^ remote head
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if blocks.is_empty() {
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debug!(self.log, "BeaconBlocks response was empty"; "request_id" => request_id);
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block_requests.update_start_slot();
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return;
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}
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// verify the range of received blocks
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// Note that the order of blocks is verified in block processing
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let last_sent_slot = blocks[blocks.len() - 1].slot;
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if block_requests.current_start_slot > blocks[0].slot
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|| block_requests
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.current_start_slot
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.add(MAX_BLOCKS_PER_REQUEST)
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< last_sent_slot
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{
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//TODO: Downvote peer - add a reason to failed
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dbg!(&blocks);
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warn!(self.log, "BeaconBlocks response returned out of range blocks";
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"request_id" => request_id,
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"response_initial_slot" => blocks[0].slot,
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"requested_initial_slot" => block_requests.current_start_slot);
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// consider this sync failed
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block_requests.state = BlockRequestsState::Failed;
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return;
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}
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// Determine if more blocks need to be downloaded. There are a few cases:
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// - We have downloaded a batch from our head_slot, which has not reached the remotes head
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// (target head). Therefore we need to download another sequential batch.
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// - The latest batch includes blocks that greater than or equal to the target_head slot,
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// which means we have caught up to their head. We then check to see if the first
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// block downloaded matches our head. If so, we are on the same chain and can process
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// the blocks. If not we need to sync back further until we are on the same chain. So
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// request more blocks.
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// - We are syncing backwards (from our head slot) and need to check if we are on the same
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// chain. If so, process the blocks, if not, request more blocks all the way up to
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// our last finalized slot.
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if block_requests.forward_sync {
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// append blocks if syncing forward
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block_requests.downloaded_blocks.append(&mut blocks);
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} else {
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// prepend blocks if syncing backwards
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block_requests.downloaded_blocks.splice(..0, blocks);
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}
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// does the batch contain the target_head_slot
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let last_element_index = block_requests.downloaded_blocks.len() - 1;
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if block_requests.downloaded_blocks[last_element_index].slot
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>= block_requests.target_head_slot
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|| !block_requests.forward_sync
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{
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// if the batch is on our chain, this is complete and we can then process.
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// Otherwise start backwards syncing until we reach a common chain.
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let earliest_slot = block_requests.downloaded_blocks[0].slot;
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//TODO: Decide which is faster. Reading block from db and comparing or calculating
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//the hash tree root and comparing.
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if Some(block_requests.downloaded_blocks[0].canonical_root())
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== root_at_slot(&self.chain, earliest_slot)
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{
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block_requests.state = BlockRequestsState::Complete;
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return;
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}
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// not on the same chain, request blocks backwards
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let state = &self.chain.head().beacon_state;
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let local_finalized_slot = state
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.finalized_checkpoint
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.epoch
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.start_slot(T::EthSpec::slots_per_epoch());
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// check that the request hasn't failed by having no common chain
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if local_finalized_slot >= block_requests.current_start_slot {
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warn!(self.log, "Peer returned an unknown chain."; "request_id" => request_id);
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block_requests.state = BlockRequestsState::Failed;
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return;
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}
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// if this is a forward sync, then we have reached the head without a common chain
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// and we need to start syncing backwards.
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if block_requests.forward_sync {
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// Start a backwards sync by requesting earlier blocks
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block_requests.forward_sync = false;
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block_requests.current_start_slot = std::cmp::min(
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self.chain.best_slot(),
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block_requests.downloaded_blocks[0].slot,
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);
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}
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}
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// update the start slot and re-queue the batch
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block_requests.update_start_slot();
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}
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pub fn recent_blocks_response(
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&mut self,
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peer_id: PeerId,
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request_id: RequestId,
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blocks: Vec<BeaconBlock<T::EthSpec>>,
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) {
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// find the request
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let parent_request = match self
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.parent_queue
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.iter_mut()
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.find(|request| request.state == BlockRequestsState::Pending(request_id))
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{
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Some(req) => req,
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None => {
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// No pending request, invalid request_id or coding error
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warn!(self.log, "RecentBeaconBlocks response unknown"; "request_id" => request_id);
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return;
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}
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};
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// if an empty response is given, the peer didn't have the requested block, try again
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if blocks.is_empty() {
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parent_request.failed_attempts += 1;
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parent_request.state = BlockRequestsState::Queued;
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parent_request.last_submitted_peer = peer_id;
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return;
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}
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// currently only support a single block lookup. Reject any response that has more than 1
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// block
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if blocks.len() != 1 {
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//TODO: Potentially downvote the peer
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debug!(self.log, "Peer sent more than 1 parent. Ignoring";
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"peer_id" => format!("{:?}", peer_id),
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"no_parents" => blocks.len()
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);
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return;
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}
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// queue for processing
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parent_request.state = BlockRequestsState::Complete;
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}
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pub fn _inject_error(_peer_id: PeerId, _id: RequestId) {
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//TODO: Remove block state from pending
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}
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pub fn peer_disconnect(&mut self, peer_id: &PeerId) {
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self.import_queue.remove(peer_id);
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self.full_peers.remove(peer_id);
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self.update_state();
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}
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pub fn add_full_peer(&mut self, peer_id: PeerId) {
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debug!(
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self.log, "Fully synced peer added";
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"peer" => format!("{:?}", peer_id),
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);
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self.full_peers.insert(peer_id);
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self.update_state();
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}
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pub fn add_unknown_block(&mut self, block: BeaconBlock<T::EthSpec>, peer_id: PeerId) {
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// if we are not in regular sync mode, ignore this block
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if let ManagerState::Regular = self.state {
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return;
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}
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// make sure this block is not already being searched for
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// TODO: Potentially store a hashset of blocks for O(1) lookups
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for parent_req in self.parent_queue.iter() {
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if let Some(_) = parent_req
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.downloaded_blocks
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.iter()
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.find(|d_block| d_block == &&block)
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{
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// we are already searching for this block, ignore it
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return;
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}
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}
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let req = ParentRequests {
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downloaded_blocks: vec![block],
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failed_attempts: 0,
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last_submitted_peer: peer_id,
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state: BlockRequestsState::Queued,
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};
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self.parent_queue.push(req);
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}
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pub(crate) fn poll(&mut self) -> ImportManagerOutcome {
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loop {
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// update the state of the manager
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self.update_state();
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// process potential block requests
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if let Some(outcome) = self.process_potential_block_requests() {
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return outcome;
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}
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// process any complete long-range batches
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if let Some(outcome) = self.process_complete_batches() {
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return outcome;
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}
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// process any parent block lookup-requests
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if let Some(outcome) = self.process_parent_requests() {
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return outcome;
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}
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// process any complete parent lookups
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let (re_run, outcome) = self.process_complete_parent_requests();
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if let Some(outcome) = outcome {
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return outcome;
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} else if !re_run {
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break;
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}
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}
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return ImportManagerOutcome::Idle;
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}
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fn update_state(&mut self) {
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let previous_state = self.state.clone();
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self.state = {
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if !self.import_queue.is_empty() {
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ManagerState::Syncing
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} else if !self.full_peers.is_empty() {
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ManagerState::Regular
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} else {
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ManagerState::Stalled
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}
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};
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if self.state != previous_state {
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info!(self.log, "Syncing state updated";
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"old_state" => format!("{:?}", previous_state),
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"new_state" => format!("{:?}", self.state),
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);
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}
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}
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fn process_potential_block_requests(&mut self) -> Option<ImportManagerOutcome> {
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// check if an outbound request is required
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// Managing a fixed number of outbound requests is maintained at the RPC protocol libp2p
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// layer and not needed here.
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// If any in queued state we submit a request.
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// remove any failed batches
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let debug_log = &self.log;
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self.import_queue.retain(|peer_id, block_request| {
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if let BlockRequestsState::Failed = block_request.state {
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debug!(debug_log, "Block import from peer failed";
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"peer_id" => format!("{:?}", peer_id),
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"downloaded_blocks" => block_request.downloaded_blocks.len()
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);
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false
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} else {
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true
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}
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});
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// process queued block requests
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for (peer_id, block_requests) in self
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.import_queue
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.iter_mut()
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.find(|(_peer_id, req)| req.state == BlockRequestsState::Queued)
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{
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let request_id = self.current_req_id;
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block_requests.state = BlockRequestsState::Pending(request_id);
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self.current_req_id += 1;
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let request = BeaconBlocksRequest {
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head_block_root: block_requests.target_head_root,
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start_slot: block_requests.current_start_slot.as_u64(),
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count: MAX_BLOCKS_PER_REQUEST,
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step: 0,
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};
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return Some(ImportManagerOutcome::RequestBlocks {
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peer_id: peer_id.clone(),
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request,
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request_id,
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});
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}
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None
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}
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fn process_complete_batches(&mut self) -> Option<ImportManagerOutcome> {
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let completed_batches = self
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.import_queue
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.iter()
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.filter(|(_peer, block_requests)| block_requests.state == BlockRequestsState::Complete)
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.map(|(peer, _)| peer)
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.cloned()
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.collect::<Vec<PeerId>>();
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for peer_id in completed_batches {
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let block_requests = self.import_queue.remove(&peer_id).expect("key exists");
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match self.process_blocks(block_requests.downloaded_blocks.clone()) {
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Ok(()) => {
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//TODO: Verify it's impossible to have empty downloaded_blocks
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let last_element = block_requests.downloaded_blocks.len() - 1;
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debug!(self.log, "Blocks processed successfully";
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"peer" => format!("{:?}", peer_id),
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"start_slot" => block_requests.downloaded_blocks[0].slot,
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"end_slot" => block_requests.downloaded_blocks[last_element].slot,
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"no_blocks" => last_element + 1,
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);
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// Re-HELLO to ensure we are up to the latest head
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return Some(ImportManagerOutcome::Hello(peer_id));
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}
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Err(e) => {
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let last_element = block_requests.downloaded_blocks.len() - 1;
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warn!(self.log, "Block processing failed";
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"peer" => format!("{:?}", peer_id),
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"start_slot" => block_requests.downloaded_blocks[0].slot,
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"end_slot" => block_requests.downloaded_blocks[last_element].slot,
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"no_blocks" => last_element + 1,
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"error" => format!("{:?}", e),
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);
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return Some(ImportManagerOutcome::DownvotePeer(peer_id));
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}
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}
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}
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None
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}
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fn process_parent_requests(&mut self) -> Option<ImportManagerOutcome> {
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// remove any failed requests
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let debug_log = &self.log;
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self.parent_queue.retain(|parent_request| {
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if parent_request.state == BlockRequestsState::Failed {
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debug!(debug_log, "Parent import failed";
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"block" => format!("{:?}",parent_request.downloaded_blocks[0].canonical_root()),
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|
"ancestors_found" => parent_request.downloaded_blocks.len()
|
|
);
|
|
false
|
|
} else {
|
|
true
|
|
}
|
|
});
|
|
|
|
// check to make sure there are peers to search for the parent from
|
|
if self.full_peers.is_empty() {
|
|
return None;
|
|
}
|
|
|
|
// check if parents need to be searched for
|
|
for parent_request in self.parent_queue.iter_mut() {
|
|
if parent_request.failed_attempts >= PARENT_FAIL_TOLERANCE {
|
|
parent_request.state = BlockRequestsState::Failed;
|
|
continue;
|
|
} else if parent_request.state == BlockRequestsState::Queued {
|
|
// check the depth isn't too large
|
|
if parent_request.downloaded_blocks.len() >= PARENT_DEPTH_TOLERANCE {
|
|
parent_request.state = BlockRequestsState::Failed;
|
|
continue;
|
|
}
|
|
|
|
parent_request.state = BlockRequestsState::Pending(self.current_req_id);
|
|
self.current_req_id += 1;
|
|
let last_element_index = parent_request.downloaded_blocks.len() - 1;
|
|
let parent_hash = parent_request.downloaded_blocks[last_element_index].parent_root;
|
|
let req = RecentBeaconBlocksRequest {
|
|
block_roots: vec![parent_hash],
|
|
};
|
|
|
|
// select a random fully synced peer to attempt to download the parent block
|
|
let peer_id = self.full_peers.iter().next().expect("List is not empty");
|
|
|
|
return Some(ImportManagerOutcome::RecentRequest(peer_id.clone(), req));
|
|
}
|
|
}
|
|
|
|
None
|
|
}
|
|
|
|
fn process_complete_parent_requests(&mut self) -> (bool, Option<ImportManagerOutcome>) {
|
|
// flag to determine if there is more process to drive or if the manager can be switched to
|
|
// an idle state
|
|
let mut re_run = false;
|
|
|
|
// Find any parent_requests ready to be processed
|
|
for completed_request in self
|
|
.parent_queue
|
|
.iter_mut()
|
|
.filter(|req| req.state == BlockRequestsState::Complete)
|
|
{
|
|
// verify the last added block is the parent of the last requested block
|
|
let last_index = completed_request.downloaded_blocks.len() - 1;
|
|
let expected_hash = completed_request.downloaded_blocks[last_index].parent_root;
|
|
// Note: the length must be greater than 1 so this cannot panic.
|
|
let block_hash = completed_request.downloaded_blocks[last_index - 1].canonical_root();
|
|
if block_hash != expected_hash {
|
|
// remove the head block
|
|
let _ = completed_request.downloaded_blocks.pop();
|
|
completed_request.state = BlockRequestsState::Queued;
|
|
//TODO: Potentially downvote the peer
|
|
let peer = completed_request.last_submitted_peer.clone();
|
|
debug!(self.log, "Peer sent invalid parent. Ignoring";
|
|
"peer_id" => format!("{:?}",peer),
|
|
"received_block" => format!("{}", block_hash),
|
|
"expected_parent" => format!("{}", expected_hash),
|
|
);
|
|
return (true, Some(ImportManagerOutcome::DownvotePeer(peer)));
|
|
}
|
|
|
|
// try and process the list of blocks up to the requested block
|
|
while !completed_request.downloaded_blocks.is_empty() {
|
|
let block = completed_request
|
|
.downloaded_blocks
|
|
.pop()
|
|
.expect("Block must exist exist");
|
|
match self.chain.process_block(block.clone()) {
|
|
Ok(BlockProcessingOutcome::ParentUnknown { parent: _ }) => {
|
|
// need to keep looking for parents
|
|
completed_request.downloaded_blocks.push(block);
|
|
completed_request.state = BlockRequestsState::Queued;
|
|
re_run = true;
|
|
break;
|
|
}
|
|
Ok(BlockProcessingOutcome::Processed { block_root: _ }) => {}
|
|
Ok(outcome) => {
|
|
// it's a future slot or an invalid block, remove it and try again
|
|
completed_request.failed_attempts += 1;
|
|
trace!(
|
|
self.log, "Invalid parent block";
|
|
"outcome" => format!("{:?}", outcome),
|
|
"peer" => format!("{:?}", completed_request.last_submitted_peer),
|
|
);
|
|
completed_request.state = BlockRequestsState::Queued;
|
|
re_run = true;
|
|
return (
|
|
re_run,
|
|
Some(ImportManagerOutcome::DownvotePeer(
|
|
completed_request.last_submitted_peer.clone(),
|
|
)),
|
|
);
|
|
}
|
|
Err(e) => {
|
|
completed_request.failed_attempts += 1;
|
|
warn!(
|
|
self.log, "Parent processing error";
|
|
"error" => format!("{:?}", e)
|
|
);
|
|
completed_request.state = BlockRequestsState::Queued;
|
|
re_run = true;
|
|
return (
|
|
re_run,
|
|
Some(ImportManagerOutcome::DownvotePeer(
|
|
completed_request.last_submitted_peer.clone(),
|
|
)),
|
|
);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// remove any full completed and processed parent chains
|
|
self.parent_queue.retain(|req| {
|
|
if req.state == BlockRequestsState::Complete {
|
|
false
|
|
} else {
|
|
true
|
|
}
|
|
});
|
|
(re_run, None)
|
|
}
|
|
|
|
fn process_blocks(&mut self, blocks: Vec<BeaconBlock<T::EthSpec>>) -> Result<(), String> {
|
|
for block in blocks {
|
|
let processing_result = self.chain.process_block(block.clone());
|
|
|
|
if let Ok(outcome) = processing_result {
|
|
match outcome {
|
|
BlockProcessingOutcome::Processed { block_root } => {
|
|
// The block was valid and we processed it successfully.
|
|
trace!(
|
|
self.log, "Imported block from network";
|
|
"slot" => block.slot,
|
|
"block_root" => format!("{}", block_root),
|
|
);
|
|
}
|
|
BlockProcessingOutcome::ParentUnknown { parent } => {
|
|
// blocks should be sequential and all parents should exist
|
|
trace!(
|
|
self.log, "ParentBlockUnknown";
|
|
"parent_root" => format!("{}", parent),
|
|
"baby_block_slot" => block.slot,
|
|
);
|
|
return Err(format!(
|
|
"Block at slot {} has an unknown parent.",
|
|
block.slot
|
|
));
|
|
}
|
|
BlockProcessingOutcome::FutureSlot {
|
|
present_slot,
|
|
block_slot,
|
|
} => {
|
|
if present_slot + FUTURE_SLOT_TOLERANCE >= block_slot {
|
|
// The block is too far in the future, drop it.
|
|
trace!(
|
|
self.log, "FutureBlock";
|
|
"msg" => "block for future slot rejected, check your time",
|
|
"present_slot" => present_slot,
|
|
"block_slot" => block_slot,
|
|
"FUTURE_SLOT_TOLERANCE" => FUTURE_SLOT_TOLERANCE,
|
|
);
|
|
return Err(format!(
|
|
"Block at slot {} is too far in the future",
|
|
block.slot
|
|
));
|
|
} else {
|
|
// The block is in the future, but not too far.
|
|
trace!(
|
|
self.log, "QueuedFutureBlock";
|
|
"msg" => "queuing future block, check your time",
|
|
"present_slot" => present_slot,
|
|
"block_slot" => block_slot,
|
|
"FUTURE_SLOT_TOLERANCE" => FUTURE_SLOT_TOLERANCE,
|
|
);
|
|
}
|
|
}
|
|
BlockProcessingOutcome::FinalizedSlot => {
|
|
trace!(
|
|
self.log, "Finalized or earlier block processed";
|
|
"outcome" => format!("{:?}", outcome),
|
|
);
|
|
// block reached our finalized slot or was earlier, move to the next block
|
|
}
|
|
_ => {
|
|
trace!(
|
|
self.log, "InvalidBlock";
|
|
"msg" => "peer sent invalid block",
|
|
"outcome" => format!("{:?}", outcome),
|
|
);
|
|
return Err(format!("Invalid block at slot {}", block.slot));
|
|
}
|
|
}
|
|
} else {
|
|
trace!(
|
|
self.log, "BlockProcessingFailure";
|
|
"msg" => "unexpected condition in processing block.",
|
|
"outcome" => format!("{:?}", processing_result)
|
|
);
|
|
return Err(format!(
|
|
"Unexpected block processing error: {:?}",
|
|
processing_result
|
|
));
|
|
}
|
|
}
|
|
Ok(())
|
|
}
|
|
}
|
|
|
|
fn root_at_slot<T: BeaconChainTypes>(
|
|
chain: &Arc<BeaconChain<T>>,
|
|
target_slot: Slot,
|
|
) -> Option<Hash256> {
|
|
chain
|
|
.rev_iter_block_roots()
|
|
.find(|(_root, slot)| *slot == target_slot)
|
|
.map(|(root, _slot)| root)
|
|
}
|