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Move ImportQueue into own file

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This commit is contained in:
Paul Hauner 2019-03-24 18:34:44 +11:00
parent ee07efb9e9
commit 755a09d164
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3 changed files with 236 additions and 227 deletions
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232
beacon_node/network/src/sync/import_queue.rs Normal file
View File

@ -0,0 +1,232 @@
use crate::beacon_chain::BeaconChain;
use eth2_libp2p::rpc::methods::*;
use eth2_libp2p::PeerId;
use slog::{debug, error};
use ssz::TreeHash;
use std::sync::Arc;
use std::time::{Duration, Instant};
use types::{BeaconBlock, BeaconBlockBody, BeaconBlockHeader, Hash256};
/// 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 ==
/// hash_tree_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 {
pub chain: Arc<BeaconChain>,
/// Partially imported blocks, keyed by the root of `BeaconBlockBody`.
pub partials: Vec<PartialBeaconBlock>,
/// Time before a queue entry is considered state.
pub stale_time: Duration,
/// Logging
log: slog::Logger,
}
impl ImportQueue {
/// Return a new, empty queue.
pub fn new(chain: Arc<BeaconChain>, stale_time: Duration, log: slog::Logger) -> Self {
Self {
chain,
partials: vec![],
stale_time,
log,
}
}
/// Completes all possible partials into `BeaconBlock` and returns them, sorted by increasing
/// slot number. Does not delete the partials from the queue, this must be done manually.
///
/// Returns `(queue_index, block, sender)`:
///
/// - `block_root`: may be used to remove the entry if it is successfully processed.
/// - `block`: the completed block.
/// - `sender`: the `PeerId` the provided the `BeaconBlockBody` which completed the partial.
pub fn complete_blocks(&self) -> Vec<(Hash256, BeaconBlock, PeerId)> {
let mut complete: Vec<(Hash256, BeaconBlock, PeerId)> = self
.partials
.iter()
.filter_map(|partial| partial.clone().complete())
.collect();
// Sort the completable partials to be in ascending slot order.
complete.sort_unstable_by(|a, b| a.1.slot.partial_cmp(&b.1.slot).unwrap());
complete
}
/// 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> {
let position = self
.partials
.iter()
.position(|p| p.block_root == block_root)?;
Some(self.partials.remove(position))
}
/// 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_indices: Vec<usize> = self
.partials
.iter()
.enumerate()
.filter_map(|(i, partial)| {
if partial.inserted + self.stale_time <= Instant::now() {
Some(i)
} else {
None
}
})
.collect();
if !stale_indices.is_empty() {
debug!(
self.log,
"ImportQueue removing stale entries";
"stale_items" => stale_indices.len(),
"stale_time_seconds" => self.stale_time.as_secs()
);
}
stale_indices.iter().for_each(|&i| {
self.partials.remove(i);
});
}
/// Returns `true` if `self.chain` has not yet processed this block.
fn is_new_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
})
}
/// Returns the index of the first new root in the list of block roots.
pub fn first_new_root(&mut self, roots: &[BlockRootSlot]) -> Option<usize> {
roots
.iter()
.position(|brs| self.is_new_block(&brs.block_root))
}
/// 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
/// 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.
///
/// Presently the queue enforces that a `BeaconBlockHeader` _must_ be received before its
/// `BeaconBlockBody`. This is not a natural requirement and we could enhance the queue to lift
/// this restraint.
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.hash_tree_root()[..]);
if self.is_new_block(&block_root) {
self.insert_header(block_root, header, sender.clone());
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>, sender: PeerId) {
for body in bodies {
self.insert_body(body, 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.
fn insert_header(&mut self, block_root: Hash256, header: BeaconBlockHeader, sender: PeerId) {
if let Some(i) = self
.partials
.iter()
.position(|p| p.block_root == block_root)
{
self.partials[i].inserted = Instant::now();
} else {
self.partials.push(PartialBeaconBlock {
block_root,
header,
body: None,
inserted: Instant::now(),
sender,
})
}
}
/// Updates an existing partial with the `body`.
///
/// If there is no header for the `body`, the body is simply discarded.
///
/// If the body already existed, the `inserted` time is set to `now`.
fn insert_body(&mut self, body: BeaconBlockBody, sender: PeerId) {
let body_root = Hash256::from_slice(&body.hash_tree_root()[..]);
self.partials.iter_mut().for_each(|mut p| {
if body_root == p.header.block_body_root {
p.inserted = Instant::now();
if p.body.is_none() {
p.body = Some(body.clone());
p.sender = sender.clone();
}
}
});
}
}
/// Individual components of a `BeaconBlock`, potentially all that are required to form a full
/// `BeaconBlock`.
#[derive(Clone, Debug)]
pub struct PartialBeaconBlock {
/// `BeaconBlock` root.
pub block_root: Hash256,
pub header: BeaconBlockHeader,
pub body: Option<BeaconBlockBody>,
/// 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 PartialBeaconBlock {
/// Consumes `self` and returns a full built `BeaconBlock`, it's root and the `sender`
/// `PeerId`, if enough information exists to complete the block. Otherwise, returns `None`.
pub fn complete(self) -> Option<(Hash256, BeaconBlock, PeerId)> {
Some((
self.block_root,
self.header.into_block(self.body?),
self.sender,
))
}
}

1
beacon_node/network/src/sync/mod.rs
View File

@ -1,3 +1,4 @@
mod import_queue;
/// Syncing for lighthouse.
///
/// Stores the various syncing methods for the beacon chain.

230
beacon_node/network/src/sync/simple_sync.rs
View File

@ -1,14 +1,14 @@
use super::import_queue::ImportQueue;
use crate::beacon_chain::BeaconChain;
use crate::message_handler::NetworkContext;
use eth2_libp2p::rpc::methods::*;
use eth2_libp2p::rpc::{RPCRequest, RPCResponse};
use eth2_libp2p::PeerId;
use slog::{debug, error, info, o, warn};
use ssz::TreeHash;
use std::collections::HashMap;
use std::sync::Arc;
use std::time::{Duration, Instant};
use types::{BeaconBlock, BeaconBlockBody, BeaconBlockHeader, Epoch, Hash256, Slot};
use std::time::Duration;
use types::{Epoch, 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;
@ -578,227 +578,3 @@ impl SimpleSync {
self.chain.hello_message()
}
}
/// 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 ==
/// hash_tree_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 {
pub chain: Arc<BeaconChain>,
/// Partially imported blocks, keyed by the root of `BeaconBlockBody`.
pub partials: Vec<PartialBeaconBlock>,
/// Time before a queue entry is considered state.
pub stale_time: Duration,
/// Logging
log: slog::Logger,
}
impl ImportQueue {
/// Return a new, empty queue.
pub fn new(chain: Arc<BeaconChain>, stale_time: Duration, log: slog::Logger) -> Self {
Self {
chain,
partials: vec![],
stale_time,
log,
}
}
/// Completes all possible partials into `BeaconBlock` and returns them, sorted by increasing
/// slot number. Does not delete the partials from the queue, this must be done manually.
///
/// Returns `(queue_index, block, sender)`:
///
/// - `block_root`: may be used to remove the entry if it is successfully processed.
/// - `block`: the completed block.
/// - `sender`: the `PeerId` the provided the `BeaconBlockBody` which completed the partial.
pub fn complete_blocks(&self) -> Vec<(Hash256, BeaconBlock, PeerId)> {
let mut complete: Vec<(Hash256, BeaconBlock, PeerId)> = self
.partials
.iter()
.filter_map(|partial| partial.clone().complete())
.collect();
// Sort the completable partials to be in ascending slot order.
complete.sort_unstable_by(|a, b| a.1.slot.partial_cmp(&b.1.slot).unwrap());
complete
}
/// 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> {
let position = self
.partials
.iter()
.position(|p| p.block_root == block_root)?;
Some(self.partials.remove(position))
}
/// 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_indices: Vec<usize> = self
.partials
.iter()
.enumerate()
.filter_map(|(i, partial)| {
if partial.inserted + self.stale_time <= Instant::now() {
Some(i)
} else {
None
}
})
.collect();
if !stale_indices.is_empty() {
debug!(
self.log,
"ImportQueue removing stale entries";
"stale_items" => stale_indices.len(),
"stale_time_seconds" => self.stale_time.as_secs()
);
}
stale_indices.iter().for_each(|&i| {
self.partials.remove(i);
});
}
/// Returns `true` if `self.chain` has not yet processed this block.
fn is_new_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
})
}
/// Returns the index of the first new root in the list of block roots.
pub fn first_new_root(&mut self, roots: &[BlockRootSlot]) -> Option<usize> {
roots
.iter()
.position(|brs| self.is_new_block(&brs.block_root))
}
/// 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
/// 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.
///
/// Presently the queue enforces that a `BeaconBlockHeader` _must_ be received before its
/// `BeaconBlockBody`. This is not a natural requirement and we could enhance the queue to lift
/// this restraint.
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.hash_tree_root()[..]);
if self.is_new_block(&block_root) {
self.insert_header(block_root, header, sender.clone());
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>, sender: PeerId) {
for body in bodies {
self.insert_body(body, 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.
fn insert_header(&mut self, block_root: Hash256, header: BeaconBlockHeader, sender: PeerId) {
if let Some(i) = self
.partials
.iter()
.position(|p| p.block_root == block_root)
{
self.partials[i].inserted = Instant::now();
} else {
self.partials.push(PartialBeaconBlock {
block_root,
header,
body: None,
inserted: Instant::now(),
sender,
})
}
}
/// Updates an existing partial with the `body`.
///
/// If there is no header for the `body`, the body is simply discarded.
///
/// If the body already existed, the `inserted` time is set to `now`.
fn insert_body(&mut self, body: BeaconBlockBody, sender: PeerId) {
let body_root = Hash256::from_slice(&body.hash_tree_root()[..]);
self.partials.iter_mut().for_each(|mut p| {
if body_root == p.header.block_body_root {
p.inserted = Instant::now();
if p.body.is_none() {
p.body = Some(body.clone());
p.sender = sender.clone();
}
}
});
}
}
/// Individual components of a `BeaconBlock`, potentially all that are required to form a full
/// `BeaconBlock`.
#[derive(Clone, Debug)]
pub struct PartialBeaconBlock {
/// `BeaconBlock` root.
pub block_root: Hash256,
pub header: BeaconBlockHeader,
pub body: Option<BeaconBlockBody>,
/// 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 PartialBeaconBlock {
/// Consumes `self` and returns a full built `BeaconBlock`, it's root and the `sender`
/// `PeerId`, if enough information exists to complete the block. Otherwise, returns `None`.
pub fn complete(self) -> Option<(Hash256, BeaconBlock, PeerId)> {
Some((
self.block_root,
self.header.into_block(self.body?),
self.sender,
))
}
}