lighthouse/eth2/fork_choice/src/optimised_lmd_ghost.rs

444 lines
16 KiB
Rust
Raw Normal View History

// Copyright 2019 Sigma Prime Pty Ltd.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
extern crate byteorder;
extern crate fast_math;
use crate::{ForkChoice, ForkChoiceError};
use byteorder::{BigEndian, ByteOrder};
use db::{
stores::{BeaconBlockStore, BeaconStateStore},
ClientDB,
};
use fast_math::log2_raw;
use std::collections::HashMap;
use std::sync::Arc;
use types::{
readers::BeaconBlockReader,
slot_epoch_height::{Height, Slot},
validator_registry::get_active_validator_indices,
BeaconBlock, Hash256,
};
//TODO: Pruning - Children
//TODO: Handle Syncing
//TODO: Sort out global constants
const GENESIS_SLOT: u64 = 0;
const FORK_CHOICE_BALANCE_INCREMENT: u64 = 1e9 as u64;
const MAX_DEPOSIT_AMOUNT: u64 = 32e9 as u64;
const EPOCH_LENGTH: u64 = 64;
/// The optimised LMD-GHOST fork choice rule.
/// NOTE: This uses u32 to represent difference between block heights. Thus this is only
/// applicable for block height differences in the range of a u32.
/// This can potentially be parallelized in some parts.
// we use fast log2, a log2 lookup table is implemented in Vitaliks code, potentially do
// the comparison. Log2_raw takes 2ns according to the documentation.
#[inline]
fn log2_int(x: u32) -> u32 {
log2_raw(x as f32) as u32
}
fn power_of_2_below(x: u32) -> u32 {
2u32.pow(log2_int(x))
}
/// Stores the necessary data structures to run the optimised lmd ghost algorithm.
pub struct OptimisedLMDGhost<T: ClientDB + Sized> {
/// A cache of known ancestors at given heights for a specific block.
//TODO: Consider FnvHashMap
cache: HashMap<CacheKey<u32>, Hash256>,
/// Log lookup table for blocks to their ancestors.
//TODO: Verify we only want/need a size 16 log lookup
ancestors: Vec<HashMap<Hash256, Hash256>>,
/// Stores the children for any given parent.
children: HashMap<Hash256, Vec<Hash256>>,
/// The latest attestation targets as a map of validator index to block hash.
//TODO: Could this be a fixed size vec
latest_attestation_targets: HashMap<u64, Hash256>,
/// Block storage access.
block_store: Arc<BeaconBlockStore<T>>,
/// State storage access.
state_store: Arc<BeaconStateStore<T>>,
max_known_height: Height,
}
impl<T> OptimisedLMDGhost<T>
where
T: ClientDB + Sized,
{
pub fn new(
block_store: Arc<BeaconBlockStore<T>>,
state_store: Arc<BeaconStateStore<T>>,
) -> Self {
OptimisedLMDGhost {
cache: HashMap::new(),
ancestors: vec![HashMap::new(); 16],
latest_attestation_targets: HashMap::new(),
children: HashMap::new(),
max_known_height: Height::new(0),
block_store,
state_store,
}
}
/// Finds the latest votes weighted by validator balance. Returns a hashmap of block_hash to
/// weighted votes.
pub fn get_latest_votes(
&self,
state_root: &Hash256,
block_slot: Slot,
) -> Result<HashMap<Hash256, u64>, ForkChoiceError> {
// get latest votes
// Note: Votes are weighted by min(balance, MAX_DEPOSIT_AMOUNT) //
// FORK_CHOICE_BALANCE_INCREMENT
// build a hashmap of block_hash to weighted votes
let mut latest_votes: HashMap<Hash256, u64> = HashMap::new();
// gets the current weighted votes
let current_state = self
.state_store
.get_deserialized(&state_root)?
.ok_or_else(|| ForkChoiceError::MissingBeaconState(*state_root))?;
let active_validator_indices = get_active_validator_indices(
&current_state.validator_registry,
block_slot.epoch(EPOCH_LENGTH),
);
for index in active_validator_indices {
let balance =
std::cmp::min(current_state.validator_balances[index], MAX_DEPOSIT_AMOUNT)
/ FORK_CHOICE_BALANCE_INCREMENT;
if balance > 0 {
if let Some(target) = self.latest_attestation_targets.get(&(index as u64)) {
*latest_votes.entry(*target).or_insert_with(|| 0) += balance;
}
}
}
Ok(latest_votes)
}
/// Gets the ancestor at a given height `at_height` of a block specified by `block_hash`.
fn get_ancestor(&mut self, block_hash: Hash256, at_height: Height) -> Option<Hash256> {
// return None if we can't get the block from the db.
let block_height = {
let block_slot = self
.block_store
.get_deserialized(&block_hash)
.ok()?
.expect("Should have returned already if None")
.slot;
block_slot.height(Slot::from(GENESIS_SLOT))
};
// verify we haven't exceeded the block height
if at_height >= block_height {
if at_height > block_height {
return None;
} else {
return Some(block_hash);
}
}
// check if the result is stored in our cache
let cache_key = CacheKey::new(&block_hash, at_height.as_u32());
if let Some(ancestor) = self.cache.get(&cache_key) {
return Some(*ancestor);
}
// not in the cache recursively search for ancestors using a log-lookup
if let Some(ancestor) = {
let ancestor_lookup = self.ancestors
[log2_int((block_height - at_height - 1u64).as_u32()) as usize]
.get(&block_hash)
//TODO: Panic if we can't lookup and fork choice fails
.expect("All blocks should be added to the ancestor log lookup table");
self.get_ancestor(*ancestor_lookup, at_height)
} {
// add the result to the cache
self.cache.insert(cache_key, ancestor);
return Some(ancestor);
}
None
}
// looks for an obvious block winner given the latest votes for a specific height
fn get_clear_winner(
&mut self,
latest_votes: &HashMap<Hash256, u64>,
block_height: Height,
) -> Option<Hash256> {
// map of vote counts for every hash at this height
let mut current_votes: HashMap<Hash256, u64> = HashMap::new();
let mut total_vote_count = 0;
// loop through the latest votes and count all votes
// these have already been weighted by balance
for (hash, votes) in latest_votes.iter() {
if let Some(ancestor) = self.get_ancestor(*hash, block_height) {
let current_vote_value = current_votes.get(&ancestor).unwrap_or_else(|| &0);
current_votes.insert(ancestor, current_vote_value + *votes);
total_vote_count += votes;
}
}
// Check if there is a clear block winner at this height. If so return it.
for (hash, votes) in current_votes.iter() {
if *votes >= total_vote_count / 2 {
// we have a clear winner, return it
return Some(*hash);
}
}
// didn't find a clear winner
None
}
// Finds the best child, splitting children into a binary tree, based on their hashes
fn choose_best_child(&self, votes: &HashMap<Hash256, u64>) -> Option<Hash256> {
let mut bitmask = 0;
for bit in (0..=255).rev() {
let mut zero_votes = 0;
let mut one_votes = 0;
let mut single_candidate = None;
for (candidate, votes) in votes.iter() {
let candidate_uint = BigEndian::read_u32(candidate);
if candidate_uint >> (bit + 1) != bitmask {
continue;
}
if (candidate_uint >> bit) % 2 == 0 {
zero_votes += votes;
} else {
one_votes += votes;
}
if single_candidate.is_none() {
single_candidate = Some(candidate);
} else {
single_candidate = None;
}
}
bitmask = (bitmask * 2) + {
if one_votes > zero_votes {
1
} else {
0
}
};
if let Some(candidate) = single_candidate {
return Some(*candidate);
}
//TODO Remove this during benchmark after testing
assert!(bit >= 1);
}
// should never reach here
None
}
}
impl<T: ClientDB + Sized> ForkChoice for OptimisedLMDGhost<T> {
fn add_block(
&mut self,
block: &BeaconBlock,
block_hash: &Hash256,
) -> Result<(), ForkChoiceError> {
// get the height of the parent
let parent_height = self
.block_store
.get_deserialized(&block.parent_root)?
.ok_or_else(|| ForkChoiceError::MissingBeaconBlock(block.parent_root))?
.slot()
.height(Slot::from(GENESIS_SLOT));
let parent_hash = &block.parent_root;
// add the new block to the children of parent
(*self
.children
.entry(block.parent_root)
.or_insert_with(|| vec![]))
.push(block_hash.clone());
// build the ancestor data structure
for index in 0..16 {
if parent_height % (1 << index) == 0 {
self.ancestors[index].insert(*block_hash, *parent_hash);
} else {
// TODO: This is unsafe. Will panic if parent_hash doesn't exist. Using it for debugging
let parent_ancestor = self.ancestors[index][parent_hash];
self.ancestors[index].insert(*block_hash, parent_ancestor);
}
}
// update the max height
self.max_known_height = std::cmp::max(self.max_known_height, parent_height + 1);
Ok(())
}
fn add_attestation(
&mut self,
validator_index: u64,
target_block_root: &Hash256,
) -> Result<(), ForkChoiceError> {
// simply add the attestation to the latest_attestation_target if the block_height is
// larger
let attestation_target = self
.latest_attestation_targets
.entry(validator_index)
.or_insert_with(|| *target_block_root);
// if we already have a value
if attestation_target != target_block_root {
// get the height of the target block
let block_height = self
.block_store
.get_deserialized(&target_block_root)?
.ok_or_else(|| ForkChoiceError::MissingBeaconBlock(*target_block_root))?
.slot()
.height(Slot::from(GENESIS_SLOT));
// get the height of the past target block
let past_block_height = self
.block_store
.get_deserialized(&attestation_target)?
.ok_or_else(|| ForkChoiceError::MissingBeaconBlock(*attestation_target))?
.slot()
.height(Slot::from(GENESIS_SLOT));
// update the attestation only if the new target is higher
if past_block_height < block_height {
*attestation_target = *target_block_root;
}
}
Ok(())
}
/// Perform lmd_ghost on the current chain to find the head.
fn find_head(&mut self, justified_block_start: &Hash256) -> Result<Hash256, ForkChoiceError> {
let block = self
.block_store
.get_deserialized(&justified_block_start)?
.ok_or_else(|| ForkChoiceError::MissingBeaconBlock(*justified_block_start))?;
let block_slot = block.slot();
let block_height = block_slot.height(Slot::from(GENESIS_SLOT));
let state_root = block.state_root();
let mut current_head = *justified_block_start;
let mut latest_votes = self.get_latest_votes(&state_root, block_slot)?;
// remove any votes that don't relate to our current head.
latest_votes.retain(|hash, _| self.get_ancestor(*hash, block_height) == Some(current_head));
// begin searching for the head
loop {
// if there are no children, we are done, return the current_head
let children = match self.children.get(&current_head) {
Some(children) => children.clone(),
None => return Ok(current_head),
};
// logarithmic lookup blocks to see if there are obvious winners, if so,
// progress to the next iteration.
let mut step =
power_of_2_below(self.max_known_height.saturating_sub(block_height).as_u32()) / 2;
while step > 0 {
if let Some(clear_winner) = self.get_clear_winner(
&latest_votes,
block_height - (block_height % u64::from(step)) + u64::from(step),
) {
current_head = clear_winner;
break;
}
step /= 2;
}
if step > 0 {
}
// if our skip lookup failed and we only have one child, progress to that child
else if children.len() == 1 {
current_head = children[0];
}
// we need to find the best child path to progress down.
else {
let mut child_votes = HashMap::new();
for (voted_hash, vote) in latest_votes.iter() {
// if the latest votes correspond to a child
if let Some(child) = self.get_ancestor(*voted_hash, block_height + 1) {
// add up the votes for each child
*child_votes.entry(child).or_insert_with(|| 0) += vote;
}
}
// given the votes on the children, find the best child
current_head = self
.choose_best_child(&child_votes)
.ok_or(ForkChoiceError::CannotFindBestChild)?;
}
// No head was found, re-iterate
// update the block height for the next iteration
let block_height = self
.block_store
.get_deserialized(&current_head)?
.ok_or_else(|| ForkChoiceError::MissingBeaconBlock(*justified_block_start))?
.slot()
.height(Slot::from(GENESIS_SLOT));
// prune the latest votes for votes that are not part of current chosen chain
// more specifically, only keep votes that have head as an ancestor
latest_votes
.retain(|hash, _| self.get_ancestor(*hash, block_height) == Some(current_head));
}
}
}
/// Type for storing blocks in a memory cache. Key is comprised of block-hash plus the height.
#[derive(PartialEq, Eq, Hash)]
pub struct CacheKey<T> {
block_hash: Hash256,
block_height: T,
}
impl<T> CacheKey<T> {
pub fn new(block_hash: &Hash256, block_height: T) -> Self {
CacheKey {
block_hash: *block_hash,
block_height,
}
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
pub fn test_power_of_2_below() {
println!("{:?}", std::f32::MAX);
assert_eq!(power_of_2_below(4), 4);
assert_eq!(power_of_2_below(5), 4);
assert_eq!(power_of_2_below(7), 4);
assert_eq!(power_of_2_below(24), 16);
assert_eq!(power_of_2_below(32), 32);
assert_eq!(power_of_2_below(33), 32);
assert_eq!(power_of_2_below(63), 32);
}
}