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First draft sync re-write. WIP

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This commit is contained in:
Age Manning 2019-08-18 03:36:13 +10:00
parent d25ec359c8
commit c259d6c006
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GPG Key ID: 05EED64B79E06A93
4 changed files with 661 additions and 875 deletions
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10
beacon_node/network/src/message_handler.rs
View File

@ -118,7 +118,14 @@ impl<T: BeaconChainTypes + 'static> MessageHandler<T> {
hello_message,
&mut self.network_context,
),
RPCRequest::Goodbye(goodbye_reason) => self.sync.on_goodbye(peer_id, goodbye_reason),
RPCRequest::Goodbye(goodbye_reason) => {
debug!(
self.log, "PeerGoodbye";
"peer" => format!("{:?}", peer_id),
"reason" => format!("{:?}", reason),
);
self.sync.on_disconnect(peer_id),
},
RPCRequest::BeaconBlocks(request) => self.sync.on_beacon_blocks_request(
peer_id,
request_id,
@ -167,6 +174,7 @@ impl<T: BeaconChainTypes + 'static> MessageHandler<T> {
Ok(beacon_blocks) => {
self.sync.on_beacon_blocks_response(
peer_id,
request_id,
beacon_blocks,
&mut self.network_context,
);

307
beacon_node/network/src/sync/import_queue.rs
View File

@ -1,307 +0,0 @@
use beacon_chain::{BeaconChain, BeaconChainTypes};
use eth2_libp2p::rpc::methods::*;
use eth2_libp2p::PeerId;
use slog::error;
use std::collections::HashMap;
use std::sync::Arc;
use std::time::{Duration, Instant};
use tree_hash::TreeHash;
use types::{BeaconBlock, BeaconBlockBody, BeaconBlockHeader, EthSpec, Hash256, Slot};
/// Provides a queue for fully and partially built `BeaconBlock`s.
///
/// The queue is fundamentally a `Vec<PartialBeaconBlock>` where no two items have the same
/// `item.block_root`. This struct it backed by a `Vec` not a `HashMap` for the following two
/// reasons:
///
/// - When we receive a `BeaconBlockBody`, the only way we can find it's matching
/// `BeaconBlockHeader` is to find a header such that `header.beacon_block_body ==
/// tree_hash_root(body)`. Therefore, if we used a `HashMap` we would need to use the root of
/// `BeaconBlockBody` as the key.
/// - It is possible for multiple distinct blocks to have identical `BeaconBlockBodies`. Therefore
/// we cannot use a `HashMap` keyed by the root of `BeaconBlockBody`.
pub struct ImportQueue<T: BeaconChainTypes> {
pub chain: Arc<BeaconChain<T>>,
/// Partially imported blocks, keyed by the root of `BeaconBlockBody`.
partials: HashMap<Hash256, PartialBeaconBlock<T::EthSpec>>,
/// Time before a queue entry is considered state.
pub stale_time: Duration,
/// Logging
log: slog::Logger,
}
impl<T: BeaconChainTypes> ImportQueue<T> {
/// Return a new, empty queue.
pub fn new(chain: Arc<BeaconChain<T>>, stale_time: Duration, log: slog::Logger) -> Self {
Self {
chain,
partials: HashMap::new(),
stale_time,
log,
}
}
/// Returns true of the if the `BlockRoot` is found in the `import_queue`.
pub fn contains_block_root(&self, block_root: Hash256) -> bool {
self.partials.contains_key(&block_root)
}
/// Attempts to complete the `BlockRoot` if it is found in the `import_queue`.
///
/// Returns an Enum with a `PartialBeaconBlockCompletion`.
/// Does not remove the `block_root` from the `import_queue`.
pub fn attempt_complete_block(
&self,
block_root: Hash256,
) -> PartialBeaconBlockCompletion<T::EthSpec> {
if let Some(partial) = self.partials.get(&block_root) {
partial.attempt_complete()
} else {
PartialBeaconBlockCompletion::MissingRoot
}
}
/// Removes the first `PartialBeaconBlock` with a matching `block_root`, returning the partial
/// if it exists.
pub fn remove(&mut self, block_root: Hash256) -> Option<PartialBeaconBlock<T::EthSpec>> {
self.partials.remove(&block_root)
}
/// Flushes all stale entries from the queue.
///
/// An entry is stale if it has as a `inserted` time that is more than `self.stale_time` in the
/// past.
pub fn remove_stale(&mut self) {
let stale_time = self.stale_time;
self.partials
.retain(|_, partial| partial.inserted + stale_time > Instant::now())
}
/// Returns `true` if `self.chain` has not yet processed this block.
pub fn chain_has_not_seen_block(&self, block_root: &Hash256) -> bool {
self.chain
.is_new_block_root(&block_root)
.unwrap_or_else(|_| {
error!(self.log, "Unable to determine if block is new.");
true
})
}
/// Adds the `block_roots` to the partials queue.
///
/// If a `block_root` is not in the queue and has not been processed by the chain it is added
/// to the queue and it's block root is included in the output.
pub fn enqueue_block_roots(
&mut self,
block_roots: &[BlockRootSlot],
sender: PeerId,
) -> Vec<BlockRootSlot> {
// TODO: This will currently not return a `BlockRootSlot` if this root exists but there is no header.
// It would be more robust if it did.
let new_block_root_slots: Vec<BlockRootSlot> = block_roots
.iter()
// Ignore any roots already stored in the queue.
.filter(|brs| !self.contains_block_root(brs.block_root))
// Ignore any roots already processed by the chain.
.filter(|brs| self.chain_has_not_seen_block(&brs.block_root))
.cloned()
.collect();
self.partials.extend(
new_block_root_slots
.iter()
.map(|brs| PartialBeaconBlock {
slot: brs.slot,
block_root: brs.block_root,
sender: sender.clone(),
header: None,
body: None,
inserted: Instant::now(),
})
.map(|partial| (partial.block_root, partial)),
);
new_block_root_slots
}
/// Adds the `headers` to the `partials` queue. Returns a list of `Hash256` block roots for
/// which we should use to request `BeaconBlockBodies`.
///
/// If a `header` is not in the queue and has not been processed by the chain it is added to
/// the queue and it's block root is included in the output.
///
/// If a `header` is already in the queue, but not yet processed by the chain the block root is
/// not included in the output and the `inserted` time for the partial record is set to
/// `Instant::now()`. Updating the `inserted` time stops the partial from becoming stale.
pub fn enqueue_headers(
&mut self,
headers: Vec<BeaconBlockHeader>,
sender: PeerId,
) -> Vec<Hash256> {
let mut required_bodies: Vec<Hash256> = vec![];
for header in headers {
let block_root = Hash256::from_slice(&header.canonical_root()[..]);
if self.chain_has_not_seen_block(&block_root)
&& !self.insert_header(block_root, header, sender.clone())
{
// If a body is empty
required_bodies.push(block_root);
}
}
required_bodies
}
/// If there is a matching `header` for this `body`, adds it to the queue.
///
/// If there is no `header` for the `body`, the body is simply discarded.
pub fn enqueue_bodies(
&mut self,
bodies: Vec<BeaconBlockBody<T::EthSpec>>,
sender: PeerId,
) -> Option<Hash256> {
let mut last_block_hash = None;
for body in bodies {
last_block_hash = self.insert_body(body, sender.clone());
}
last_block_hash
}
pub fn enqueue_full_blocks(&mut self, blocks: Vec<BeaconBlock<T::EthSpec>>, sender: PeerId) {
for block in blocks {
self.insert_full_block(block, sender.clone());
}
}
/// Inserts a header to the queue.
///
/// If the header already exists, the `inserted` time is set to `now` and not other
/// modifications are made.
/// Returns true is `body` exists.
fn insert_header(
&mut self,
block_root: Hash256,
header: BeaconBlockHeader,
sender: PeerId,
) -> bool {
let mut exists = false;
self.partials
.entry(block_root)
.and_modify(|partial| {
partial.header = Some(header.clone());
partial.inserted = Instant::now();
if partial.body.is_some() {
exists = true;
}
})
.or_insert_with(|| PartialBeaconBlock {
slot: header.slot,
block_root,
header: Some(header),
body: None,
inserted: Instant::now(),
sender,
});
exists
}
/// Updates an existing partial with the `body`.
///
/// If the body already existed, the `inserted` time is set to `now`.
///
/// Returns the block hash of the inserted body
fn insert_body(
&mut self,
body: BeaconBlockBody<T::EthSpec>,
sender: PeerId,
) -> Option<Hash256> {
let body_root = Hash256::from_slice(&body.tree_hash_root()[..]);
let mut last_root = None;
self.partials.iter_mut().for_each(|(root, mut p)| {
if let Some(header) = &mut p.header {
if body_root == header.body_root {
p.inserted = Instant::now();
p.body = Some(body.clone());
p.sender = sender.clone();
last_root = Some(*root);
}
}
});
last_root
}
/// Updates an existing `partial` with the completed block, or adds a new (complete) partial.
///
/// If the partial already existed, the `inserted` time is set to `now`.
fn insert_full_block(&mut self, block: BeaconBlock<T::EthSpec>, sender: PeerId) {
let block_root = Hash256::from_slice(&block.canonical_root()[..]);
let partial = PartialBeaconBlock {
slot: block.slot,
block_root,
header: Some(block.block_header()),
body: Some(block.body),
inserted: Instant::now(),
sender,
};
self.partials
.entry(block_root)
.and_modify(|existing_partial| *existing_partial = partial.clone())
.or_insert(partial);
}
}
/// Individual components of a `BeaconBlock`, potentially all that are required to form a full
/// `BeaconBlock`.
#[derive(Clone, Debug)]
pub struct PartialBeaconBlock<E: EthSpec> {
pub slot: Slot,
/// `BeaconBlock` root.
pub block_root: Hash256,
pub header: Option<BeaconBlockHeader>,
pub body: Option<BeaconBlockBody<E>>,
/// The instant at which this record was created or last meaningfully modified. Used to
/// determine if an entry is stale and should be removed.
pub inserted: Instant,
/// The `PeerId` that last meaningfully contributed to this item.
pub sender: PeerId,
}
impl<E: EthSpec> PartialBeaconBlock<E> {
/// Attempts to build a block.
///
/// Does not comsume the `PartialBeaconBlock`.
pub fn attempt_complete(&self) -> PartialBeaconBlockCompletion<E> {
if self.header.is_none() {
PartialBeaconBlockCompletion::MissingHeader(self.slot)
} else if self.body.is_none() {
PartialBeaconBlockCompletion::MissingBody
} else {
PartialBeaconBlockCompletion::Complete(
self.header
.clone()
.unwrap()
.into_block(self.body.clone().unwrap()),
)
}
}
}
/// The result of trying to convert a `BeaconBlock` into a `PartialBeaconBlock`.
pub enum PartialBeaconBlockCompletion<E: EthSpec> {
/// The partial contains a valid BeaconBlock.
Complete(BeaconBlock<E>),
/// The partial does not exist.
MissingRoot,
/// The partial contains a `BeaconBlockRoot` but no `BeaconBlockHeader`.
MissingHeader(Slot),
/// The partial contains a `BeaconBlockRoot` and `BeaconBlockHeader` but no `BeaconBlockBody`.
MissingBody,
}

800
beacon_node/network/src/sync/manager.rs
View File

@ -1,283 +1,639 @@
const MAX_BLOCKS_PER_REQUEST: usize = 10;
const MAXIMUM_BLOCKS_PER_REQUEST: usize = 10;
const SIMULTANEOUS_REQUESTS: usize = 10;
use super::simple_sync::FUTURE_SLOT_TOLERANCE;
/// The number of slots that we can import blocks ahead of us, before going into full Sync mode.
const SLOT_IMPORT_TOLERANCE: u64 = 10;
struct Chunk {
id: usize,
start_slot: Slot,
end_slot: Slot,
const PARENT_FAIL_TOLERANCE: usize = 3;
const PARENT_DEPTH_TOLERANCE: usize = SLOT_IMPORT_TOLERANCE*2;
enum BlockRequestsState {
QueuedForward,
QueuedBackward,
Pending(RequestId),
Complete,
}
struct CompletedChunk {
peer_id: PeerId,
chunk: Chunk,
blocks: Vec<BeaconBlock>,
struct BlockRequests {
target_head_slot: Slot
target_head_root: Hash256,
downloaded_blocks: Vec<BeaconBlock>,
state: State,
}
struct ProcessedChunk {
peer_id: PeerId,
chunk: Chunk,
struct ParentRequests {
downloaded_blocks: Vec<BeaconBlock>,
attempts: usize,
last_submitted_peer: PeerId, // to downvote the submitting peer.
state: BlockRequestsState,
}
#[derive(PartialEq)]
pub enum SyncState {
Idle,
Downloading,
ColdSync {
max_wanted_slot: Slot,
max_wanted_hash: Hash256,
impl BlockRequests {
// gets the start slot for next batch
// last block slot downloaded plus 1
fn next_start_slot(&self) -> Option<Slot> {
if !self.downloaded_blocks.is_empty() {
match self.state {
BlockRequestsState::QueuedForward => {
let last_element_index = self.downloaded_blocks.len() -1;
Some(downloaded_blocks[last_element_index].slot.add(1))
}
BlockRequestsState::QueuedBackward => {
let earliest_known_slot = self.downloaded_blocks[0].slot;
Some(earliest_known_slot.add(1).sub(MAX_BLOCKS_PER_REQUEST))
}
}
}
else {
None
}
}
}
pub enum SyncManagerState {
RequestBlocks(peer_id, BeaconBlockRequest),
enum ManagerState {
Syncing,
Regular,
Stalled,
}
enum ImportManagerOutcome {
Idle,
}
pub struct PeerSyncInfo {
RequestBlocks{
peer_id: PeerId,
fork_version: [u8,4],
finalized_root: Hash256,
finalized_epoch: Epoch,
head_root: Hash256,
head_slot: Slot,
requested_slot_skip: Option<(Slot, usize)>,
request_id: RequestId,
request: BeaconBlocksRequest,
},
RecentRequest(PeerId, RecentBeaconBlocksRequest),
DownvotePeer(PeerId),
}
pub(crate) struct SyncManager<T: BeaconChainTypes> {
pub struct ImportManager {
/// A reference to the underlying beacon chain.
chain: Arc<BeaconChain<T>>,
/// A mapping of Peers to their respective PeerSyncInfo.
available_peers: HashMap<PeerId, PeerSyncInfo>,
wanted_chunks: Vec<Chunk>,
pending_chunks: HashMap<PeerId,Chunk>,
completed_chunks: Vec<Chunk>,
processed_chunks: Vec<Chunk>, // ordered
multi_peer_sections: HashMap<PeerId, MultiPeerSection>
current_requests: usize,
latest_wanted_slot: Option<Slot, Hash256>,
sync_status: SyncStatus,
to_process_chunk_id: usize,
state: MangerState,
import_queue: HashMap<PeerId, BlockRequests>,
parent_queue: Vec<ParentRequests>,
full_peers: Hashset<PeerId>,
current_req_id: usize,
log: Logger,
}
impl<T: BeaconChainTypes> SyncManager<T> {
/// Adds a sync-able peer and determines which blocks to download given the current state of
/// the chain, known peers and currently requested blocks.
fn add_sync_peer(&mut self, peer_id: PeerId, remote: PeerSyncInfo, network &mut NetworkContext) {
impl ImportManager {
pub fn add_peer(&mut self, peer_id, remote: PeerSyncInfo) {
// TODO: Improve comments.
// initially try to download blocks from our current head
// then backwards search all the way back to our finalized epoch until we match on a chain
// has to be done sequentially to find next slot to start the batch from
let local = PeerSyncInfo::from(&self.chain);
let remote_finalized_slot = remote.finalized_epoch.start_slot(T::EthSpec::slots_per_epoch());
let local_finalized_slot = local.finalized_epoch.start_slot(T::EthSpec::slots_per_epoch());
// cold sync
if remote_finalized_slot > local.head_slot {
if let SyncState::Idle || SyncState::Downloading = self.sync_state {
info!(self.log, "Cold Sync Started", "start_slot" => local.head_slot, "latest_known_finalized" => remote_finalized_slot);
self.sync_state = SyncState::ColdSync{Slot::from(0), remote.finalized_hash}
}
if let SyncState::ColdSync{max_wanted_slot, max_wanted_hjash } = self.sync_state {
// We don't assume that our current head is the canonical chain. So we request blocks from
// our last finalized slot to ensure we are on the finalized chain.
if max_wanted_slot < remote_finalized_slot {
let remaining_blocks = remote_finalized_slot - max_wanted_slot;
for chunk in (0..remaining_blocks/MAXIMUM_BLOCKS_PER_REQUEST) {
self.wanted_chunks.push(
Chunk {
id: self.current_chunk_id,
previous_chunk: self.curent_chunk_id.saturating_sub(1),
start_slot: chunk*MAXIMUM_BLOCKS_PER_REQUEST + self.last_wanted_slot,
end_slot: (section+1)*MAXIMUM_BLOCKS_PER_REQUEST +self.last_wanted_slot,
})
self.current_chunk_id +=1;
}
// add any extra partial chunks
self.pending_section.push( Section {
start_slot: (remaining_blocks/MAXIMUM_BLOCKS_PER_REQUEST) + 1,
end_slot: remote_finalized_slot,
})
self.current_chunk_id +=1;
info!(self.log, "Cold Sync Updated", "start_slot" => local.head_slot, "latest_known_finalized" => remote_finalized_slot);
self.sync_state = SyncState::ColdSync{remote_finalized_slot, remote.finalized_hash}
}
}
else { // hot sync
if remote_head_slot > self.chain.head().beacon_state.slot {
if let SyncState::Idle = self.sync_state {
self.sync_state = SyncState::Downloading
info!(self.log, "Sync Started", "start_slot" => local.head_slot, "latest_known_head" => remote.head_slot.as_u64());
}
self.latest_known_slot = remote_head_slot;
//TODO Build requests.
}
}
available_peers.push(remote);
}
pub fn add_blocks(&mut self, chunk_id: RequestId, peer_id: PeerId, blocks: Vec<BeaconBlock>) {
if SyncState::ColdSync{max_wanted_slot, max_wanted_hash} = self.sync_state {
let chunk = match self.pending_chunks.remove(&peer_id) {
Some(chunks) => {
match chunks.find(|chunk| chunk.id == chunk_id) {
Some(chunk) => chunk,
None => {
warn!(self.log, "Received blocks for an unknown chunk";
"peer"=> peer_id);
// If a peer is within SLOT_IMPORT_TOLERANCE from out head slot, ignore a batch sync
if remote.head_slot.sub(local.head_slot) < SLOT_IMPORT_TOLERANCE {
trace!(self.log, "Ignoring full sync with peer";
"peer" => peer_id,
"peer_head_slot" => remote.head_slot,
"local_head_slot" => local.head_slot,
);
// remove the peer from the queue if it exists
self.import_queue.remove(&peer_id);
return;
}
if let Some(block_requests) = self.import_queue.get_mut(&peer_id) {
// update the target head slot
if remote.head_slot > requested_block.target_head_slot {
block_requests.target_head_slot = remote.head_slot;
}
},
} else {
let block_requests = BlockRequests {
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
target_head_root: remote.head_root,
downloaded_blocks: Vec::new(),
state: RequestedBlockState::Queued
}
self.import_queue.insert(peer_id, block_requests);
}
}
pub fn beacon_blocks_response(peer_id: PeerId, request_id: RequestId, blocks: Vec<BeaconBlock>) {
// find the request
let block_requests = match self.import_queue.get_mut(&peer_id) {
Some(req) if req.state = RequestedBlockState::Pending(request_id) => req,
None => {
warn!(self.log, "Received blocks without a request";
"peer"=> peer_id);
// No pending request, invalid request_id or coding error
warn!(self.log, "BeaconBlocks response unknown"; "request_id" => request_id);
return;
}
};
// add to completed
self.current_requests -= 1;
self.completed_chunks.push(CompletedChunk(peer_id, Chunk));
}
// The response should contain at least one block.
//
// If we are syncing up to a target head block, at least the target head block should be
// returned. If we are syncing back to our last finalized block the request should return
// at least the last block we received (last known block). In diagram form:
//
// unknown blocks requested blocks downloaded blocks
// |-------------------|------------------------|------------------------|
// ^finalized slot ^ requested start slot ^ last known block ^ remote head
if blocks.is_empty() {
warn!(self.log, "BeaconBlocks response was empty"; "request_id" => request_id);
block_requests.state = RequestedBlockState::Failed;
return;
}
pub fn inject_error(id: RequestId, peer_id) {
if let SyncState::ColdSync{ _max_wanted_slot, _max_wanted_hash } {
match self.pending_chunks.get(&peer_id) {
Some(chunks) => {
if let Some(pos) = chunks.iter().position(|c| c.id == id) {
chunks.remove(pos);
}
},
None => {
debug!(self.log,
"Received an error for an unknown request";
"request_id" => id,
"peer" => peer_id
);
}
}
// Add the newly downloaded blocks to the current list of downloaded blocks. This also
// determines if we are syncing forward or backward.
let syncing_forwards = {
if block_requests.blocks.is_empty() {
block_requests.blocks.push(blocks);
true
}
else if block_requests.blocks[0].slot < blocks[0].slot { // syncing forwards
// verify the peer hasn't sent overlapping blocks - ensuring the strictly
// increasing blocks in a batch will be verified during the processing
if block_requests.next_slot() > blocks[0].slot {
warn!(self.log, "BeaconBlocks response returned duplicate blocks", "request_id" => request_id, "response_initial_slot" => blocks[0].slot, "requested_initial_slot" => block_requests.next_slot());
block_requests.state = RequestedBlockState::Failed;
return;
}
pub fn poll(&mut self) -> SyncManagerState {
// if cold sync
if let SyncState::ColdSync(waiting_slot, max_wanted_slot, max_wanted_hash) = self.sync_state {
// Try to process completed chunks
for completed_chunk in self.completed_chunks {
let chunk = completed_chunk.1;
let last_chunk_id = {
let no_processed_chunks = self.processed_chunks.len();
if elements == 0 { 0 } else { self.processed_chunks[no_processed_chunks].id }
block_requests.blocks.push(blocks);
true
}
else { false }
};
if chunk.id == last_chunk_id + 1 {
// try and process the chunk
for block in chunk.blocks {
let processing_result = self.chain.process_block(block.clone());
if let Ok(outcome) = processing_result {
match outcome {
BlockProcessingOutCome::Processed { block_root} => {
// block successfully processed
},
BlockProcessingOutcome::BlockIsAlreadyKnown => {
warn!(
self.log, "Block Already Known";
"source" => source,
"sync" => "Cold Sync",
"parent_root" => format!("{}", parent),
"baby_block_slot" => block.slot,
"peer" => format!("{:?}", chunk.0),
);
},
_ => {
// An error has occurred
// This could be due to the previous chunk or the current chunk.
// Re-issue both.
warn!(
self.log, "Faulty Chunk";
"source" => source,
"sync" => "Cold Sync",
"parent_root" => format!("{}", parent),
"baby_block_slot" => block.slot,
"peer" => format!("{:?}", chunk.0),
"outcome" => format!("{:?}", outcome),
);
// re-issue both chunks
// if both are the same peer. Downgrade the peer.
let past_chunk = self.processed_chunks.pop()
self.wanted_chunks.insert(0, chunk.clone());
self.wanted_chunks.insert(0, past_chunk.clone());
if chunk.0 == past_chunk.peer_id {
// downgrade peer
return SyncManagerState::DowngradePeer(chunk.0);
// Determine if more blocks need to be downloaded. There are a few cases:
// - We have downloaded a batch from our head_slot, which has not reached the remotes head
// (target head). Therefore we need to download another sequential batch.
// - The latest batch includes blocks that greater than or equal to the target_head slot,
// which means we have caught up to their head. We then check to see if the first
// block downloaded matches our head. If so, we are on the same chain and can process
// the blocks. If not we need to sync back further until we are on the same chain. So
// request more blocks.
// - We are syncing backwards (from our head slot) and need to check if we are on the same
// chain. If so, process the blocks, if not, request more blocks all the way up to
// our last finalized slot.
if syncing_forwards {
// does the batch contain the target_head_slot
let last_element_index = block_requests.blocks.len()-1;
if block_requests[last_element_index].slot >= block_requests.target_slot {
// if the batch is on our chain, this is complete and we can then process.
// Otherwise start backwards syncing until we reach a common chain.
let earliest_slot = block_requests_blocks[0].slot
if block_requests.blocks[0] == self.chain.get_block_by_slot(earliest_slot) {
block_requests.state = RequestedBlockState::Complete;
return;
}
// not on the same chain, request blocks backwards
// binary search, request half the distance between the earliest block and our
// finalized slot
let state = &beacon_chain.head().beacon_state;
let local_finalized_slot = state.finalized_checkpoint.epoch; //TODO: Convert to slot
// check that the request hasn't failed by having no common chain
if local_finalized_slot >= block_requests.blocks[0] {
warn!(self.log, "Peer returned an unknown chain."; "request_id" => request_id);
block_requests.state = RequestedBlockState::Failed;
return;
}
// Start a backwards sync by requesting earlier blocks
// There can be duplication in downloaded blocks here if there are a large number
// of skip slots. In all cases we at least re-download the earliest known block.
// It is unlikely that a backwards sync in required, so we accept this duplication
// for now.
block_requests.state = RequestedBlockState::QueuedBackward;
}
else {
// batch doesn't contain the head slot, request the next batch
block_requests.state = RequestedBlockState::QueuedForward;
}
}
else {
// syncing backwards
// if the batch is on our chain, this is complete and we can then process.
// Otherwise continue backwards
let earliest_slot = block_requests_blocks[0].slot
if block_requests.blocks[0] == self.chain.get_block_by_slot(earliest_slot) {
block_requests.state = RequestedBlockState::Complete;
return;
}
block_requests.state = RequestedBlockState::QueuedBackward;
}
}
pub fn recent_blocks_response(peer_id: PeerId, request_id: RequestId, blocks: Vec<BeaconBlock>) {
// find the request
let parent_request = match self.parent_queue.get_mut(&peer_id) {
Some(req) if req.state = RequestedBlockState::Pending(request_id) => req,
None => {
// No pending request, invalid request_id or coding error
warn!(self.log, "RecentBeaconBlocks response unknown"; "request_id" => request_id);
return;
}
};
// if an empty response is given, the peer didn't have the requested block, try again
if blocks.is_empty() {
parent_request.attempts += 1;
parent_request.state = RequestedBlockState::QueuedForward;
parent_request.last_submitted_peer = peer_id;
return;
}
// currently only support a single block lookup. Reject any response that has more than 1
// block
if blocks.len() != 1 {
//TODO: Potentially downvote the peer
debug!(self.log, "Peer sent more than 1 parent. Ignoring";
"peer_id" => peer_id,
"no_parents" => blocks.len()
);
return;
}
// queue for processing
parent_request.state = RequestedBlockState::Complete;
}
pub fn inject_error(peer_id: PeerId, id: RequestId) {
//TODO: Remove block state from pending
}
pub fn peer_disconnect(peer_id: PeerId) {
self.import_queue.remove(&peer_id);
self.full_peers.remove(&peer_id);
self.update_state();
}
pub fn add_full_peer(peer_id: PeerId) {
debug!(
self.log, "Fully synced peer added";
"peer" => format!("{:?}", peer_id),
);
self.full_peers.insert(peer_id);
self.update_state();
}
pub fn add_unknown_block(&mut self,block: BeaconBlock) {
// if we are not in regular sync mode, ignore this block
if self.state == ManagerState::Regular {
return;
}
// make sure this block is not already being searched for
// TODO: Potentially store a hashset of blocks for O(1) lookups
for parent_req in self.parent_queue.iter() {
if let Some(_) = parent_req.downloaded_blocks.iter().find(|d_block| d_block == block) {
// we are already searching for this block, ignore it
return;
}
}
let req = ParentRequests {
downloaded_blocks: vec![block],
failed_attempts: 0,
state: RequestedBlockState::QueuedBackward
}
self.parent_queue.push(req);
}
pub fn poll() -> ImportManagerOutcome {
loop {
// update the state of the manager
self.update_state();
// process potential block requests
if let Some(outcome) = self.process_potential_block_requests() {
return outcome;
}
// process any complete long-range batches
if let Some(outcome) = self.process_complete_batches() {
return outcome;
}
// process any parent block lookup-requests
if let Some(outcome) = self.process_parent_requests() {
return outcome;
}
// process any complete parent lookups
if let (re_run, outcome) = self.process_complete_parent_requests() {
if let Some(outcome) = outcome {
return outcome;
}
else if !re_run {
break;
}
}
}
return ImportManagerOutcome::Idle;
}
// chunk successfully processed
debug!(self.log,
"Chunk Processed";
"id" => chunk.id
"start_slot" => chunk.start_slot,
"end_slot" => chunk.end_slot,
fn update_state(&mut self) {
let previous_state = self.state;
self.state = {
if !self.import_queue.is_empty() {
ManagerState::Syncing
}
else if !self.full_peers.is_empty() {
ManagerState::Regualar
}
else {
ManagerState::Stalled }
};
if self.state != previous_state {
info!(self.log, "Syncing state updated",
"old_state" => format!("{:?}", previous_state)
"new_state" => format!("{:?}", self.state)
);
self.processed_chunks.push(chunk);
}
}
// chunks completed, update the state
self.sync_state = SyncState::ColdSync{waiting_slot, max_wanted_slot, max_wanted_hash};
// Remove stales
// Spawn requests
if self.current_requests <= SIMULTANEOUS_REQUESTS {
if !self.wanted_chunks.is_empty() {
let chunk = self.wanted_chunks.remove(0);
for n in (0..self.peers.len()).rev() {
let peer = self.peers.swap_remove(n);
let peer_finalized_slot = peer.finalized_epoch.start_slot(T::EthSpec::slots_per_epoch());
if peer_finalized_slot >= chunk.end_slot {
*self.pending.chunks.entry(&peer_id).or_insert_with(|| Vec::new).push(chunk);
self.active_peers.push(peer);
self.current_requests +=1;
let block_request = BeaconBlockRequest {
head_block_root,
start_slot: chunk.start_slot,
count: chunk.end_slot - chunk.start_slot
step: 1
fn process_potential_block_requests(&mut self) -> Option<ImportManagerOutcome> {
// check if an outbound request is required
// Managing a fixed number of outbound requests is maintained at the RPC protocol libp2p
// layer and not needed here.
// If any in queued state we submit a request.
// remove any failed batches
self.import_queue.retain(|peer_id, block_request| {
if block_request.state == RequestedBlockState::Failed {
debug!(self.log, "Block import from peer failed",
"peer_id" => peer_id,
"downloaded_blocks" => block_request.downloaded.blocks.len()
);
false
}
return SyncManagerState::BlockRequest(peer, block_request);
else { true }
});
for (peer_id, block_requests) in self.import_queue.iter_mut() {
if let Some(request) = requests.iter().find(|req| req.state == RequestedBlockState::QueuedForward || req.state == RequestedBlockState::QueuedBackward) {
let request.state = RequestedBlockState::Pending(self.current_req_id);
self.current_req_id +=1;
let req = BeaconBlocksRequest {
head_block_root: request.target_root,
start_slot: request.next_start_slot().unwrap_or_else(|| self.chain.head().slot),
count: MAX_BLOCKS_PER_REQUEST,
step: 0
}
return Some(ImportManagerOutCome::RequestBlocks{ peer_id, req });
}
}
// no peers for this chunk
self.wanted_chunks.push(chunk);
return SyncManagerState::Stalled
None
}
fn process_complete_batches(&mut self) -> Option<ImportManagerOutcome> {
let completed_batches = self.import_queue.iter().filter(|_peer, block_requests| block_requests.state == RequestedState::Complete).map(|peer, _| peer).collect::<Vec<PeerId>>();
for peer_id in completed_batches {
let block_requests = self.import_queue.remove(&peer_id).unwrap("key exists");
match self.process_blocks(block_requests.downloaded_blocks) {
Ok(()) => {
//TODO: Verify it's impossible to have empty downloaded_blocks
last_element = block_requests.downloaded_blocks.len() -1
debug!(self.log, "Blocks processed successfully";
"peer" => peer_id,
"start_slot" => block_requests.downloaded_blocks[0].slot,
"end_slot" => block_requests.downloaded_blocks[last_element].slot,
"no_blocks" => last_element + 1,
);
// Re-HELLO to ensure we are up to the latest head
return Some(ImportManagerOutcome::Hello(peer_id));
}
Err(e) => {
last_element = block_requests.downloaded_blocks.len() -1
warn!(self.log, "Block processing failed";
"peer" => peer_id,
"start_slot" => block_requests.downloaded_blocks[0].slot,
"end_slot" => block_requests.downloaded_blocks[last_element].slot,
"no_blocks" => last_element + 1,
"error" => format!("{:?}", e),
);
return Some(ImportManagerOutcome::DownvotePeer(peer_id));
}
}
}
None
}
fn process_parent_requests(&mut self) -> Option<ImportManagerOutcome> {
// remove any failed requests
self.parent_queue.retain(|parent_request| {
if parent_request.state == RequestedBlockState::Failed {
debug!(self.log, "Parent import failed",
"block" => parent_request.downloaded_blocks[0].hash,
"siblings found" => parent_request.len()
);
false
}
else { true }
});
// check to make sure there are peers to search for the parent from
if self.full_peers.is_empty() {
return;
}
// 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::QueuedForward {
parent_request.state = BlockRequestsState::Pending(self.current_req_id);
self.current_req_id +=1;
let parent_hash =
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, 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;
// verify the last added block is the parent of the last requested block
let last_index = parent_requests.downloaded_blocks.len() -1;
let expected_hash = parent_requests.downloaded_blocks[last_index].parent ;
let block_hash = parent_requests.downloaded_blocks[0].tree_hash_root();
if block_hash != expected_hash {
//TODO: Potentially downvote the peer
debug!(self.log, "Peer sent invalid parent. Ignoring";
"peer_id" => peer_id,
"received_block" => block_hash,
"expected_parent" => expected_hash,
);
return;
}
// Find any parent_requests ready to be processed
for completed_request in self.parent_queue.iter_mut().filter(|req| req.state == BlockRequestsState::Complete) {
// 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();
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::QueuedForward;
re_run = true;
break;
}
Ok(BlockProcessingOutcome::Processed { _ } => { }
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::QueuedForward;
re_run = true;
return (re_run, Some(ImportManagerOutcome::DownvotePeer(completed_request.last_submitted_peer)));
}
Err(e) => {
completed_request.failed_attempts +=1;
warn!(
self.log, "Parent processing error";
"error" => format!("{:?}", e);
);
completed_request.state == BlockRequestsState::QueuedForward;
re_run = true;
return (re_run, Some(ImportManagerOutcome::DownvotePeer(completed_request.last_submitted_peer)));
}
}
}
}
// if hot sync
return SyncManagerState::Idle
// 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";
"source" => source,
"slot" => block.slot,
"block_root" => format!("{}", block_root),
"peer" => format!("{:?}", peer_id),
);
}
BlockProcessingOutcome::ParentUnknown { parent } => {
// blocks should be sequential and all parents should exist
trace!(
self.log, "ParentBlockUnknown";
"source" => source,
"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";
"source" => source,
"msg" => "block for future slot rejected, check your time",
"present_slot" => present_slot,
"block_slot" => block_slot,
"FUTURE_SLOT_TOLERANCE" => FUTURE_SLOT_TOLERANCE,
"peer" => format!("{:?}", peer_id),
);
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";
"source" => source,
"msg" => "queuing future block, check your time",
"present_slot" => present_slot,
"block_slot" => block_slot,
"FUTURE_SLOT_TOLERANCE" => FUTURE_SLOT_TOLERANCE,
"peer" => format!("{:?}", peer_id),
);
}
}
_ => {
trace!(
self.log, "InvalidBlock";
"source" => source,
"msg" => "peer sent invalid block",
"outcome" => format!("{:?}", outcome),
"peer" => format!("{:?}", peer_id),
);
return Err(format!("Invalid block at slot {}", block.slot));
}
}
Ok(())
} else {
trace!(
self.log, "BlockProcessingFailure";
"source" => source,
"msg" => "unexpected condition in processing block.",
"outcome" => format!("{:?}", processing_result)
);
return Err(format!("Unexpected block processing error: {:?}", processing_result));
}
}
}
}

407
beacon_node/network/src/sync/simple_sync.rs
View File

@ -14,11 +14,6 @@ use types::{
Attestation, BeaconBlock, BeaconBlockBody, BeaconBlockHeader, Epoch, EthSpec, Hash256, Slot,
};
/// The number of slots that we can import blocks ahead of us, before going into full Sync mode.
const SLOT_IMPORT_TOLERANCE: u64 = 100;
/// The amount of seconds a block may exist in the import queue.
const QUEUE_STALE_SECS: u64 = 100;
/// If a block is more than `FUTURE_SLOT_TOLERANCE` slots ahead of our slot clock, we drop it.
/// Otherwise we queue it.
@ -35,9 +30,11 @@ pub struct PeerSyncInfo {
finalized_epoch: Epoch,
head_root: Hash256,
head_slot: Slot,
requested_slot_skip: Option<(Slot, usize)>,
}
impl From<HelloMessage> for PeerSyncInfo {
fn from(hello: HelloMessage) -> PeerSyncInfo {
PeerSyncInfo {
@ -69,10 +66,7 @@ pub enum SyncState {
pub struct SimpleSync<T: BeaconChainTypes> {
/// A reference to the underlying beacon chain.
chain: Arc<BeaconChain<T>>,
/// A mapping of Peers to their respective PeerSyncInfo.
known_peers: HashMap<PeerId, PeerSyncInfo>,
/// The current state of the syncing protocol.
state: SyncState,
manager: ImportManager,
log: slog::Logger,
}
@ -81,49 +75,24 @@ impl<T: BeaconChainTypes> SimpleSync<T> {
pub fn new(beacon_chain: Arc<BeaconChain<T>>, log: &slog::Logger) -> Self {
let sync_logger = log.new(o!("Service"=> "Sync"));
let queue_item_stale_time = Duration::from_secs(QUEUE_STALE_SECS);
let import_queue =
ImportQueue::new(beacon_chain.clone(), queue_item_stale_time, log.clone());
SimpleSync {
chain: beacon_chain.clone(),
known_peers: HashMap::new(),
import_queue,
state: SyncState::Idle,
manager: ImportManager::new(),
log: sync_logger,
}
}
/// Handle a `Goodbye` message from a peer.
///
/// Removes the peer from `known_peers`.
pub fn on_goodbye(&mut self, peer_id: PeerId, reason: GoodbyeReason) {
info!(
self.log, "PeerGoodbye";
"peer" => format!("{:?}", peer_id),
"reason" => format!("{:?}", reason),
);
self.known_peers.remove(&peer_id);
}
/// Handle a peer disconnect.
///
/// Removes the peer from `known_peers`.
/// Removes the peer from the manager.
pub fn on_disconnect(&mut self, peer_id: PeerId) {
info!(
self.log, "Peer Disconnected";
"peer" => format!("{:?}", peer_id),
);
self.known_peers.remove(&peer_id);
self.manager.peer_disconnect(&peer_id);
}
/// Handle the connection of a new peer.
///
/// Sends a `Hello` message to the peer.
pub fn on_connect(&self, peer_id: PeerId, network: &mut NetworkContext) {
info!(self.log, "PeerConnected"; "peer" => format!("{:?}", peer_id));
network.send_rpc_request(peer_id, RPCRequest::Hello(hello_message(&self.chain)));
}
@ -137,7 +106,7 @@ impl<T: BeaconChainTypes> SimpleSync<T> {
hello: HelloMessage,
network: &mut NetworkContext,
) {
debug!(self.log, "HelloRequest"; "peer" => format!("{:?}", peer_id));
trace!(self.log, "HelloRequest"; "peer" => format!("{:?}", peer_id));
// Say hello back.
network.send_rpc_response(
@ -156,7 +125,7 @@ impl<T: BeaconChainTypes> SimpleSync<T> {
hello: HelloMessage,
network: &mut NetworkContext,
) {
debug!(self.log, "HelloResponse"; "peer" => format!("{:?}", peer_id));
trace!(self.log, "HelloResponse"; "peer" => format!("{:?}", peer_id));
// Process the hello message, without sending back another hello.
self.process_hello(peer_id, hello, network);
@ -178,7 +147,7 @@ impl<T: BeaconChainTypes> SimpleSync<T> {
if local.fork_version != remote.fork_version {
// The node is on a different network/fork, disconnect them.
info!(
debug!(
self.log, "HandshakeFailure";
"peer" => format!("{:?}", peer_id),
"reason" => "network_id"
@ -195,7 +164,7 @@ impl<T: BeaconChainTypes> SimpleSync<T> {
// different to the one in our chain.
//
// Therefore, the node is on a different chain and we should not communicate with them.
info!(
debug!(
self.log, "HandshakeFailure";
"peer" => format!("{:?}", peer_id),
"reason" => "different finalized chain"
@ -227,13 +196,10 @@ impl<T: BeaconChainTypes> SimpleSync<T> {
.exists::<BeaconBlock<T::EthSpec>>(&remote.best_root)
.unwrap_or_else(|_| false)
{
// If the node's best-block is already known to us, we have nothing to request.
debug!(
self.log,
"NaivePeer";
"peer" => format!("{:?}", peer_id),
"reason" => "best block is known"
);
// If the node's best-block is already known to us and they are close to our current
// head, treat them as a fully sync'd peer.
self.import_manager.add_full_peer(peer_id);
self.process_sync();
} else {
// The remote node has an equal or great finalized epoch and we don't know it's head.
//
@ -246,43 +212,60 @@ impl<T: BeaconChainTypes> SimpleSync<T> {
"remote_latest_finalized_epoch" => remote.latest_finalized_epoch,
);
self.import_manager.add_peer(peer_id, remote);
self.process_sync();
}
}
self.proess_sync(&mut self) {
loop {
match self.sync_manager.poll() {
SyncManagerState::RequestBlocks(peer_id, req) {
debug!(
match self.import_manager.poll() {
ImportManagerOutcome::RequestBlocks(peer_id, req) {
trace!(
self.log,
"RPCRequest(BeaconBlockBodies)";
"count" => req.block_roots.len(),
"RPC Request";
"method" => "BeaconBlocks",
"count" => req.count,
"peer" => format!("{:?}", peer_id)
);
network.send_rpc_request(peer_id.clone(), RPCRequest::BeaconBlocks(req));
},
SyncManagerState::Stalled {
// need more peers to continue sync
warn!(self.log, "No useable peers for sync");
break;
ImportManagerOutcome::RecentRequest(peer_id, req) {
trace!(
self.log,
"RPC Request";
"method" => "RecentBeaconBlocks",
"count" => req.block_roots.len(),
"peer" => format!("{:?}", peer_id)
);
network.send_rpc_request(peer_id.clone(), RPCRequest::RecentBeaconBlocks(req));
},
ImportManagerOutcome::DownvotePeer(peer_id) {
trace!(
self.log,
"Peer downvoted";
"peer" => format!("{:?}", peer_id)
);
// TODO: Implement reputation
network.disconnect(peer_id.clone(), GoodbyeReason::Fault);
},
SyncManagerState::Idle {
// nothing to do
break;
return;
}
}
}
}
/*
fn root_at_slot(&self, target_slot: Slot) -> Option<Hash256> {
self.chain
.rev_iter_block_roots()
.find(|(_root, slot)| *slot == target_slot)
.map(|(root, _slot)| root)
}
*/
/// Handle a `BeaconBlocks` request from the peer.
pub fn on_beacon_blocks_request(
@ -346,8 +329,8 @@ impl<T: BeaconChainTypes> SimpleSync<T> {
pub fn on_beacon_blocks_response(
&mut self,
peer_id: PeerId,
request_id: RequestId,
res: Vec<BeaconBlock<T::EthSpec>>,
network: &mut NetworkContext,
) {
debug!(
self.log,
@ -356,10 +339,27 @@ impl<T: BeaconChainTypes> SimpleSync<T> {
"count" => res.block_bodies.len(),
);
if !res.is_empty() {
self.sync_manager.add_blocks(peer_id, blocks);
self.import_manager.beacon_blocks_response(peer_id, request_id, blocks);
self.process_sync();
}
/// Handle a `RecentBeaconBlocks` response from the peer.
pub fn on_recent_beacon_blocks_response(
&mut self,
peer_id: PeerId,
request_id: RequestId,
res: Vec<BeaconBlock<T::EthSpec>>,
) {
debug!(
self.log,
"BeaconBlocksResponse";
"peer" => format!("{:?}", peer_id),
"count" => res.block_bodies.len(),
);
self.import_manager.recent_blocks_response(peer_id, request_id, blocks);
self.process_sync();
}
@ -372,7 +372,6 @@ impl<T: BeaconChainTypes> SimpleSync<T> {
&mut self,
peer_id: PeerId,
block: BeaconBlock<T::EthSpec>,
network: &mut NetworkContext,
) -> bool {
if let Some(outcome) =
self.process_block(peer_id.clone(), block.clone(), network, &"gossip")
@ -380,53 +379,17 @@ impl<T: BeaconChainTypes> SimpleSync<T> {
match outcome {
BlockProcessingOutcome::Processed { .. } => SHOULD_FORWARD_GOSSIP_BLOCK,
BlockProcessingOutcome::ParentUnknown { parent } => {
// Add this block to the queue
self.import_queue
.enqueue_full_blocks(vec![block.clone()], peer_id.clone());
debug!(
self.log, "RequestParentBlock";
"parent_root" => format!("{}", parent),
"parent_slot" => block.slot - 1,
"peer" => format!("{:?}", peer_id),
);
// Request roots between parent and start of finality from peer.
let start_slot = self
.chain
.head()
.beacon_state
.finalized_checkpoint
.epoch
.start_slot(T::EthSpec::slots_per_epoch());
self.request_block_roots(
peer_id,
BeaconBlockRootsRequest {
// Request blocks between `latest_finalized_slot` and the `block`
start_slot,
count: block.slot.as_u64() - start_slot.as_u64(),
},
network,
);
// Clean the stale entries from the queue.
self.import_queue.remove_stale();
// Inform the sync manager to find parents for this block
self.import_manager.add_unknown_block(block.clone());
SHOULD_FORWARD_GOSSIP_BLOCK
}
BlockProcessingOutcome::FutureSlot {
present_slot,
block_slot,
} if present_slot + FUTURE_SLOT_TOLERANCE >= block_slot => {
self.import_queue
.enqueue_full_blocks(vec![block], peer_id.clone());
//TODO: Decide the logic here
SHOULD_FORWARD_GOSSIP_BLOCK
}
// Note: known blocks are forwarded on the gossip network.
//
// We rely upon the lower layers (libp2p) to stop loops occurring from re-gossiped
// blocks.
BlockProcessingOutcome::BlockIsAlreadyKnown => SHOULD_FORWARD_GOSSIP_BLOCK,
_ => SHOULD_NOT_FORWARD_GOSSIP_BLOCK,
}
@ -457,48 +420,8 @@ impl<T: BeaconChainTypes> SimpleSync<T> {
}
}
/// Request some `BeaconBlockRoots` from the remote peer.
fn request_block_roots(
&mut self,
peer_id: PeerId,
req: BeaconBlockRootsRequest,
network: &mut NetworkContext,
) {
// Potentially set state to sync.
if self.state == SyncState::Idle && req.count > SLOT_IMPORT_TOLERANCE {
debug!(self.log, "Entering downloading sync state.");
self.state = SyncState::Downloading;
}
debug!(
self.log,
"RPCRequest(BeaconBlockRoots)";
"count" => req.count,
"peer" => format!("{:?}", peer_id)
);
// TODO: handle count > max count.
network.send_rpc_request(peer_id.clone(), RPCRequest::BeaconBlockRoots(req));
}
/// Request some `BeaconBlockHeaders` from the remote peer.
fn request_block_headers(
&mut self,
peer_id: PeerId,
req: BeaconBlockHeadersRequest,
network: &mut NetworkContext,
) {
debug!(
self.log,
"RPCRequest(BeaconBlockHeaders)";
"max_headers" => req.max_headers,
"peer" => format!("{:?}", peer_id)
);
network.send_rpc_request(peer_id.clone(), RPCRequest::BeaconBlockHeaders(req));
}
/*
/// Returns `true` if `self.chain` has not yet processed this block.
pub fn chain_has_seen_block(&self, block_root: &Hash256) -> bool {
!self
@ -509,207 +432,13 @@ impl<T: BeaconChainTypes> SimpleSync<T> {
false
})
}
*/
/// Generates our current state in the form of a HELLO RPC message.
pub fn generate_hello(&self) -> HelloMessage {
hello_message(&self.chain)
}
/// Helper function to attempt to process a partial block.
///
/// If the block can be completed recursively call `process_block`
/// else request missing parts.
fn attempt_process_partial_block(
&mut self,
peer_id: PeerId,
block_root: Hash256,
network: &mut NetworkContext,
source: &str,
) -> Option<BlockProcessingOutcome> {
match self.import_queue.attempt_complete_block(block_root) {
PartialBeaconBlockCompletion::MissingBody => {
// Unable to complete the block because the block body is missing.
debug!(
self.log, "RequestParentBody";
"source" => source,
"block_root" => format!("{}", block_root),
"peer" => format!("{:?}", peer_id),
);
// Request the block body from the peer.
self.request_block_bodies(
peer_id,
BeaconBlockBodiesRequest {
block_roots: vec![block_root],
},
network,
);
None
}
PartialBeaconBlockCompletion::MissingHeader(slot) => {
// Unable to complete the block because the block header is missing.
debug!(
self.log, "RequestParentHeader";
"source" => source,
"block_root" => format!("{}", block_root),
"peer" => format!("{:?}", peer_id),
);
// Request the block header from the peer.
self.request_block_headers(
peer_id,
BeaconBlockHeadersRequest {
start_root: block_root,
start_slot: slot,
max_headers: 1,
skip_slots: 0,
},
network,
);
None
}
PartialBeaconBlockCompletion::MissingRoot => {
// The `block_root` is not known to the queue.
debug!(
self.log, "MissingParentRoot";
"source" => source,
"block_root" => format!("{}", block_root),
"peer" => format!("{:?}", peer_id),
);
// Do nothing.
None
}
PartialBeaconBlockCompletion::Complete(block) => {
// The block exists in the queue, attempt to process it
trace!(
self.log, "AttemptProcessParent";
"source" => source,
"block_root" => format!("{}", block_root),
"parent_slot" => block.slot,
"peer" => format!("{:?}", peer_id),
);
self.process_block(peer_id.clone(), block, network, source)
}
}
}
/// Processes the `block` that was received from `peer_id`.
///
/// If the block was submitted to the beacon chain without internal error, `Some(outcome)` is
/// returned, otherwise `None` is returned. Note: `Some(_)` does not necessarily indicate that
/// the block was successfully processed or valid.
///
/// This function performs the following duties:
///
/// - Attempting to import the block into the beacon chain.
/// - Logging
/// - Requesting unavailable blocks (e.g., if parent is unknown).
/// - Disconnecting faulty nodes.
///
/// This function does not remove processed blocks from the import queue.
fn process_block(
&mut self,
peer_id: PeerId,
block: BeaconBlock<T::EthSpec>,
network: &mut NetworkContext,
source: &str,
) -> Option<BlockProcessingOutcome> {
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.
debug!(
self.log, "Imported block from network";
"source" => source,
"slot" => block.slot,
"block_root" => format!("{}", block_root),
"peer" => format!("{:?}", peer_id),
);
}
BlockProcessingOutcome::ParentUnknown { parent } => {
// The parent has not been processed
trace!(
self.log, "ParentBlockUnknown";
"source" => source,
"parent_root" => format!("{}", parent),
"baby_block_slot" => block.slot,
"peer" => format!("{:?}", peer_id),
);
// If the parent is in the `import_queue` attempt to complete it then process it.
// All other cases leave `parent` in `import_queue` and return original outcome.
if let Some(BlockProcessingOutcome::Processed { .. }) =
self.attempt_process_partial_block(peer_id, parent, network, source)
{
// If processing parent is successful, re-process block and remove parent from queue
self.import_queue.remove(parent);
// Attempt to process `block` again
match self.chain.process_block(block) {
Ok(outcome) => return Some(outcome),
Err(_) => return None,
}
}
}
BlockProcessingOutcome::FutureSlot {
present_slot,
block_slot,
} => {
if present_slot + FUTURE_SLOT_TOLERANCE >= block_slot {
// The block is too far in the future, drop it.
warn!(
self.log, "FutureBlock";
"source" => source,
"msg" => "block for future slot rejected, check your time",
"present_slot" => present_slot,
"block_slot" => block_slot,
"FUTURE_SLOT_TOLERANCE" => FUTURE_SLOT_TOLERANCE,
"peer" => format!("{:?}", peer_id),
);
network.disconnect(peer_id, GoodbyeReason::Fault);
} else {
// The block is in the future, but not too far.
debug!(
self.log, "QueuedFutureBlock";
"source" => source,
"msg" => "queuing future block, check your time",
"present_slot" => present_slot,
"block_slot" => block_slot,
"FUTURE_SLOT_TOLERANCE" => FUTURE_SLOT_TOLERANCE,
"peer" => format!("{:?}", peer_id),
);
}
}
_ => {
debug!(
self.log, "InvalidBlock";
"source" => source,
"msg" => "peer sent invalid block",
"outcome" => format!("{:?}", outcome),
"peer" => format!("{:?}", peer_id),
);
}
}
Some(outcome)
} else {
error!(
self.log, "BlockProcessingFailure";
"source" => source,
"msg" => "unexpected condition in processing block.",
"outcome" => format!("{:?}", processing_result)
);
None
}
}
}
/// Build a `HelloMessage` representing the state of the given `beacon_chain`.