openethereum/ethcore/src/block_queue.rs
2016-05-31 16:59:01 +02:00

548 lines
16 KiB
Rust

// Copyright 2015, 2016 Ethcore (UK) Ltd.
// This file is part of Parity.
// Parity is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// Parity is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with Parity. If not, see <http://www.gnu.org/licenses/>.
//! A queue of blocks. Sits between network or other I/O and the `BlockChain`.
//! Sorts them ready for blockchain insertion.
use std::thread::{JoinHandle, self};
use std::sync::atomic::{AtomicBool, Ordering as AtomicOrdering};
use util::*;
use verification::*;
use error::*;
use engine::Engine;
use views::*;
use header::*;
use service::*;
use client::BlockStatus;
use util::panics::*;
known_heap_size!(0, UnverifiedBlock, VerifyingBlock, PreverifiedBlock);
const MIN_MEM_LIMIT: usize = 16384;
const MIN_QUEUE_LIMIT: usize = 512;
/// Block queue configuration
#[derive(Debug)]
pub struct BlockQueueConfig {
/// Maximum number of blocks to keep in unverified queue.
/// When the limit is reached, is_full returns true.
pub max_queue_size: usize,
/// Maximum heap memory to use.
/// When the limit is reached, is_full returns true.
pub max_mem_use: usize,
}
impl Default for BlockQueueConfig {
fn default() -> Self {
BlockQueueConfig {
max_queue_size: 30000,
max_mem_use: 50 * 1024 * 1024,
}
}
}
/// Block queue status
#[derive(Debug)]
pub struct BlockQueueInfo {
/// Number of queued blocks pending verification
pub unverified_queue_size: usize,
/// Number of verified queued blocks pending import
pub verified_queue_size: usize,
/// Number of blocks being verified
pub verifying_queue_size: usize,
/// Configured maximum number of blocks in the queue
pub max_queue_size: usize,
/// Configured maximum number of bytes to use
pub max_mem_use: usize,
/// Heap memory used in bytes
pub mem_used: usize,
}
impl BlockQueueInfo {
/// The total size of the queues.
pub fn total_queue_size(&self) -> usize { self.unverified_queue_size + self.verified_queue_size + self.verifying_queue_size }
/// The size of the unverified and verifying queues.
pub fn incomplete_queue_size(&self) -> usize { self.unverified_queue_size + self.verifying_queue_size }
/// Indicates that queue is full
pub fn is_full(&self) -> bool {
self.unverified_queue_size + self.verified_queue_size + self.verifying_queue_size > self.max_queue_size ||
self.mem_used > self.max_mem_use
}
/// Indicates that queue is empty
pub fn is_empty(&self) -> bool {
self.unverified_queue_size + self.verified_queue_size + self.verifying_queue_size == 0
}
}
/// A queue of blocks. Sits between network or other I/O and the `BlockChain`.
/// Sorts them ready for blockchain insertion.
pub struct BlockQueue {
panic_handler: Arc<PanicHandler>,
engine: Arc<Box<Engine>>,
more_to_verify: Arc<Condvar>,
verification: Arc<Verification>,
verifiers: Vec<JoinHandle<()>>,
deleting: Arc<AtomicBool>,
ready_signal: Arc<QueueSignal>,
empty: Arc<Condvar>,
processing: RwLock<HashSet<H256>>,
max_queue_size: usize,
max_mem_use: usize,
}
struct UnverifiedBlock {
header: Header,
bytes: Bytes,
}
struct VerifyingBlock {
hash: H256,
block: Option<PreverifiedBlock>,
}
struct QueueSignal {
deleting: Arc<AtomicBool>,
signalled: AtomicBool,
message_channel: IoChannel<NetSyncMessage>,
}
impl QueueSignal {
#[cfg_attr(feature="dev", allow(bool_comparison))]
fn set(&self) {
// Do not signal when we are about to close
if self.deleting.load(AtomicOrdering::Relaxed) {
return;
}
if self.signalled.compare_and_swap(false, true, AtomicOrdering::Relaxed) == false {
self.message_channel.send(UserMessage(SyncMessage::BlockVerified)).expect("Error sending BlockVerified message");
}
}
fn reset(&self) {
self.signalled.store(false, AtomicOrdering::Relaxed);
}
}
struct Verification {
// All locks must be captured in the order declared here.
unverified: Mutex<VecDeque<UnverifiedBlock>>,
verified: Mutex<VecDeque<PreverifiedBlock>>,
verifying: Mutex<VecDeque<VerifyingBlock>>,
bad: Mutex<HashSet<H256>>,
}
impl BlockQueue {
/// Creates a new queue instance.
pub fn new(config: BlockQueueConfig, engine: Arc<Box<Engine>>, message_channel: IoChannel<NetSyncMessage>) -> BlockQueue {
let verification = Arc::new(Verification {
unverified: Mutex::new(VecDeque::new()),
verified: Mutex::new(VecDeque::new()),
verifying: Mutex::new(VecDeque::new()),
bad: Mutex::new(HashSet::new()),
});
let more_to_verify = Arc::new(Condvar::new());
let deleting = Arc::new(AtomicBool::new(false));
let ready_signal = Arc::new(QueueSignal {
deleting: deleting.clone(),
signalled: AtomicBool::new(false),
message_channel: message_channel
});
let empty = Arc::new(Condvar::new());
let panic_handler = PanicHandler::new_in_arc();
let mut verifiers: Vec<JoinHandle<()>> = Vec::new();
let thread_count = max(::num_cpus::get(), 3) - 2;
for i in 0..thread_count {
let verification = verification.clone();
let engine = engine.clone();
let more_to_verify = more_to_verify.clone();
let ready_signal = ready_signal.clone();
let empty = empty.clone();
let deleting = deleting.clone();
let panic_handler = panic_handler.clone();
verifiers.push(
thread::Builder::new()
.name(format!("Verifier #{}", i))
.spawn(move || {
panic_handler.catch_panic(move || {
BlockQueue::verify(verification, engine, more_to_verify, ready_signal, deleting, empty)
}).unwrap()
})
.expect("Error starting block verification thread")
);
}
BlockQueue {
engine: engine,
panic_handler: panic_handler,
ready_signal: ready_signal.clone(),
more_to_verify: more_to_verify.clone(),
verification: verification.clone(),
verifiers: verifiers,
deleting: deleting.clone(),
processing: RwLock::new(HashSet::new()),
empty: empty.clone(),
max_queue_size: max(config.max_queue_size, MIN_QUEUE_LIMIT),
max_mem_use: max(config.max_mem_use, MIN_MEM_LIMIT),
}
}
fn verify(verification: Arc<Verification>, engine: Arc<Box<Engine>>, wait: Arc<Condvar>, ready: Arc<QueueSignal>, deleting: Arc<AtomicBool>, empty: Arc<Condvar>) {
while !deleting.load(AtomicOrdering::Acquire) {
{
let mut unverified = verification.unverified.lock().unwrap();
if unverified.is_empty() && verification.verifying.lock().unwrap().is_empty() {
empty.notify_all();
}
while unverified.is_empty() && !deleting.load(AtomicOrdering::Acquire) {
unverified = wait.wait(unverified).unwrap();
}
if deleting.load(AtomicOrdering::Acquire) {
return;
}
}
let block = {
let mut unverified = verification.unverified.lock().unwrap();
if unverified.is_empty() {
continue;
}
let mut verifying = verification.verifying.lock().unwrap();
let block = unverified.pop_front().unwrap();
verifying.push_back(VerifyingBlock{ hash: block.header.hash(), block: None });
block
};
let block_hash = block.header.hash();
match verify_block_unordered(block.header, block.bytes, engine.deref().deref()) {
Ok(verified) => {
let mut verifying = verification.verifying.lock().unwrap();
for e in verifying.iter_mut() {
if e.hash == block_hash {
e.block = Some(verified);
break;
}
}
if !verifying.is_empty() && verifying.front().unwrap().hash == block_hash {
// we're next!
let mut verified = verification.verified.lock().unwrap();
let mut bad = verification.bad.lock().unwrap();
BlockQueue::drain_verifying(&mut verifying, &mut verified, &mut bad);
ready.set();
}
},
Err(err) => {
let mut verifying = verification.verifying.lock().unwrap();
let mut verified = verification.verified.lock().unwrap();
let mut bad = verification.bad.lock().unwrap();
warn!(target: "client", "Stage 2 block verification failed for {}\nError: {:?}", block_hash, err);
bad.insert(block_hash.clone());
verifying.retain(|e| e.hash != block_hash);
BlockQueue::drain_verifying(&mut verifying, &mut verified, &mut bad);
ready.set();
}
}
}
}
fn drain_verifying(verifying: &mut VecDeque<VerifyingBlock>, verified: &mut VecDeque<PreverifiedBlock>, bad: &mut HashSet<H256>) {
while !verifying.is_empty() && verifying.front().unwrap().block.is_some() {
let block = verifying.pop_front().unwrap().block.unwrap();
if bad.contains(&block.header.parent_hash) {
bad.insert(block.header.hash());
}
else {
verified.push_back(block);
}
}
}
/// Clear the queue and stop verification activity.
pub fn clear(&self) {
let mut unverified = self.verification.unverified.lock().unwrap();
let mut verifying = self.verification.verifying.lock().unwrap();
let mut verified = self.verification.verified.lock().unwrap();
unverified.clear();
verifying.clear();
verified.clear();
self.processing.write().unwrap().clear();
}
/// Wait for unverified queue to be empty
pub fn flush(&self) {
let mut unverified = self.verification.unverified.lock().unwrap();
while !unverified.is_empty() || !self.verification.verifying.lock().unwrap().is_empty() {
unverified = self.empty.wait(unverified).unwrap();
}
}
/// Check if the block is currently in the queue
pub fn block_status(&self, hash: &H256) -> BlockStatus {
if self.processing.read().unwrap().contains(&hash) {
return BlockStatus::Queued;
}
if self.verification.bad.lock().unwrap().contains(&hash) {
return BlockStatus::Bad;
}
BlockStatus::Unknown
}
/// Add a block to the queue.
pub fn import_block(&self, bytes: Bytes) -> ImportResult {
let header = BlockView::new(&bytes).header();
let h = header.hash();
{
if self.processing.read().unwrap().contains(&h) {
return Err(ImportError::AlreadyQueued.into());
}
let mut bad = self.verification.bad.lock().unwrap();
if bad.contains(&h) {
return Err(ImportError::KnownBad.into());
}
if bad.contains(&header.parent_hash) {
bad.insert(h.clone());
return Err(ImportError::KnownBad.into());
}
}
match verify_block_basic(&header, &bytes, self.engine.deref().deref()) {
Ok(()) => {
self.processing.write().unwrap().insert(h.clone());
self.verification.unverified.lock().unwrap().push_back(UnverifiedBlock { header: header, bytes: bytes });
self.more_to_verify.notify_all();
Ok(h)
},
Err(err) => {
warn!(target: "client", "Stage 1 block verification failed for {}\nError: {:?}", BlockView::new(&bytes).header_view().sha3(), err);
self.verification.bad.lock().unwrap().insert(h.clone());
Err(err)
}
}
}
/// Mark given block and all its children as bad. Stops verification.
pub fn mark_as_bad(&self, block_hashes: &[H256]) {
if block_hashes.is_empty() {
return;
}
let mut verified_lock = self.verification.verified.lock().unwrap();
let mut verified = verified_lock.deref_mut();
let mut bad = self.verification.bad.lock().unwrap();
let mut processing = self.processing.write().unwrap();
bad.reserve(block_hashes.len());
for hash in block_hashes {
bad.insert(hash.clone());
processing.remove(&hash);
}
let mut new_verified = VecDeque::new();
for block in verified.drain(..) {
if bad.contains(&block.header.parent_hash) {
bad.insert(block.header.hash());
processing.remove(&block.header.hash());
} else {
new_verified.push_back(block);
}
}
*verified = new_verified;
}
/// Mark given block as processed
pub fn mark_as_good(&self, block_hashes: &[H256]) {
if block_hashes.is_empty() {
return;
}
let mut processing = self.processing.write().unwrap();
for hash in block_hashes {
processing.remove(&hash);
}
}
/// Removes up to `max` verified blocks from the queue
pub fn drain(&self, max: usize) -> Vec<PreverifiedBlock> {
let mut verified = self.verification.verified.lock().unwrap();
let count = min(max, verified.len());
let mut result = Vec::with_capacity(count);
for _ in 0..count {
let block = verified.pop_front().unwrap();
result.push(block);
}
self.ready_signal.reset();
if !verified.is_empty() {
self.ready_signal.set();
}
result
}
/// Get queue status.
pub fn queue_info(&self) -> BlockQueueInfo {
let (unverified_len, unverified_bytes) = {
let v = self.verification.unverified.lock().unwrap();
(v.len(), v.heap_size_of_children())
};
let (verifying_len, verifying_bytes) = {
let v = self.verification.verifying.lock().unwrap();
(v.len(), v.heap_size_of_children())
};
let (verified_len, verified_bytes) = {
let v = self.verification.verified.lock().unwrap();
(v.len(), v.heap_size_of_children())
};
BlockQueueInfo {
unverified_queue_size: unverified_len,
verifying_queue_size: verifying_len,
verified_queue_size: verified_len,
max_queue_size: self.max_queue_size,
max_mem_use: self.max_mem_use,
mem_used:
unverified_bytes
+ verifying_bytes
+ verified_bytes
// TODO: https://github.com/servo/heapsize/pull/50
//+ self.processing.read().unwrap().heap_size_of_children(),
}
}
/// Optimise memory footprint of the heap fields.
pub fn collect_garbage(&self) {
{
self.verification.unverified.lock().unwrap().shrink_to_fit();
self.verification.verifying.lock().unwrap().shrink_to_fit();
self.verification.verified.lock().unwrap().shrink_to_fit();
}
self.processing.write().unwrap().shrink_to_fit();
}
}
impl MayPanic for BlockQueue {
fn on_panic<F>(&self, closure: F) where F: OnPanicListener {
self.panic_handler.on_panic(closure);
}
}
impl Drop for BlockQueue {
fn drop(&mut self) {
trace!(target: "shutdown", "[BlockQueue] Closing...");
self.clear();
self.deleting.store(true, AtomicOrdering::Release);
self.more_to_verify.notify_all();
for t in self.verifiers.drain(..) {
t.join().unwrap();
}
trace!(target: "shutdown", "[BlockQueue] Closed.");
}
}
#[cfg(test)]
mod tests {
use util::*;
use spec::*;
use block_queue::*;
use tests::helpers::*;
use error::*;
use views::*;
fn get_test_queue() -> BlockQueue {
let spec = get_test_spec();
let engine = spec.engine;
BlockQueue::new(BlockQueueConfig::default(), Arc::new(engine), IoChannel::disconnected())
}
#[test]
fn can_be_created() {
// TODO better test
let spec = Spec::new_test();
let engine = spec.engine;
let _ = BlockQueue::new(BlockQueueConfig::default(), Arc::new(engine), IoChannel::disconnected());
}
#[test]
fn can_import_blocks() {
let queue = get_test_queue();
if let Err(e) = queue.import_block(get_good_dummy_block()) {
panic!("error importing block that is valid by definition({:?})", e);
}
}
#[test]
fn returns_error_for_duplicates() {
let queue = get_test_queue();
if let Err(e) = queue.import_block(get_good_dummy_block()) {
panic!("error importing block that is valid by definition({:?})", e);
}
let duplicate_import = queue.import_block(get_good_dummy_block());
match duplicate_import {
Err(e) => {
match e {
Error::Import(ImportError::AlreadyQueued) => {},
_ => { panic!("must return AlreadyQueued error"); }
}
}
Ok(_) => { panic!("must produce error"); }
}
}
#[test]
fn returns_ok_for_drained_duplicates() {
let queue = get_test_queue();
let block = get_good_dummy_block();
let hash = BlockView::new(&block).header().hash().clone();
if let Err(e) = queue.import_block(block) {
panic!("error importing block that is valid by definition({:?})", e);
}
queue.flush();
queue.drain(10);
queue.mark_as_good(&[ hash ]);
if let Err(e) = queue.import_block(get_good_dummy_block()) {
panic!("error importing block that has already been drained ({:?})", e);
}
}
#[test]
fn returns_empty_once_finished() {
let queue = get_test_queue();
queue.import_block(get_good_dummy_block()).expect("error importing block that is valid by definition");
queue.flush();
queue.drain(1);
assert!(queue.queue_info().is_empty());
}
#[test]
fn test_mem_limit() {
let spec = get_test_spec();
let engine = spec.engine;
let mut config = BlockQueueConfig::default();
config.max_mem_use = super::MIN_MEM_LIMIT; // empty queue uses about 15000
let queue = BlockQueue::new(config, Arc::new(engine), IoChannel::disconnected());
assert!(!queue.queue_info().is_full());
let mut blocks = get_good_dummy_block_seq(50);
for b in blocks.drain(..) {
queue.import_block(b).unwrap();
}
assert!(queue.queue_info().is_full());
}
}