Sync block collection
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arkpar
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52e22b8a51
commit
b5e10a53af
412
sync/src/blocks.rs
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412
sync/src/blocks.rs
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// Copyright 2015, 2016 Ethcore (UK) Ltd.
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// This file is part of Parity.
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// Parity is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// Parity is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with Parity. If not, see <http://www.gnu.org/licenses/>.
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use util::*;
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use ethcore::header::{ Header as BlockHeader};
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known_heap_size!(0, HeaderId, SyncBlock);
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/// Block data with optional body.
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struct SyncBlock {
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header: Bytes,
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body: Option<Bytes>,
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}
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/// Used to identify header by transactions and uncles hashes
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#[derive(Eq, PartialEq, Hash)]
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struct HeaderId {
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transactions_root: H256,
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uncles: H256
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}
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/// A collection of blocks and subchain pointers being downloaded. This keeps track of
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/// which headers/bodies need to be downloaded, which are being downloaded and also holds
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/// the downloaded blocks.
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pub struct BlockCollection {
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/// Heads of subchains to download
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heads: Vec<H256>,
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/// Downloaded blocks.
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blocks: HashMap<H256, SyncBlock>,
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/// Downloaded blocks by parent.
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parents: HashMap<H256, H256>,
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/// Used to map body to header.
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header_ids: HashMap<HeaderId, H256>,
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/// First block in `blocks`.
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head: Option<H256>,
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/// Set of block header hashes being downloaded
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downloading_headers: HashSet<H256>,
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/// Set of block bodies being downloaded identified by block hash.
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downloading_bodies: HashSet<H256>,
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}
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impl BlockCollection {
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/// Create a new instance.
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pub fn new() -> BlockCollection {
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BlockCollection {
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blocks: HashMap::new(),
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header_ids: HashMap::new(),
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heads: Vec::new(),
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parents: HashMap::new(),
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head: None,
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downloading_headers: HashSet::new(),
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downloading_bodies: HashSet::new(),
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}
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}
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/// Clear everything.
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pub fn clear(&mut self) {
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self.blocks.clear();
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self.parents.clear();
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self.header_ids.clear();
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self.heads.clear();
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self.head = None;
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self.downloading_headers.clear();
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self.downloading_bodies.clear();
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}
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/// Reset collection for a new sync round with given subchain block hashes.
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pub fn reset_to(&mut self, hashes: Vec<H256>) {
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self.clear();
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self.heads = hashes;
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}
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/// Insert a set oh headers into collection and advance subchain head pointers.
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pub fn insert_headers(&mut self, headers: Vec<Bytes>) {
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for h in headers.into_iter() {
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if let Err(e) = self.insert_header(h) {
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trace!(target: "sync", "Ignored invalid header: {:?}", e);
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}
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}
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self.update_heads();
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}
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/// Insert a collection of block bodies for previously downloaded headers.
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pub fn insert_bodies(&mut self, bodies: Vec<Bytes>) {
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for b in bodies.into_iter() {
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if let Err(e) = self.insert_body(b) {
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trace!(target: "sync", "Ignored invalid body: {:?}", e);
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}
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}
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}
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/// Returns a set of block hashes that require a body download. The returned set is marked as being downloaded.
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pub fn needed_bodies(&mut self, count: usize, _ignore_downloading: bool) -> Vec<H256> {
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if self.head.is_none() {
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return Vec::new();
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}
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let mut needed_bodies: Vec<H256> = Vec::new();
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let mut head = self.head;
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while head.is_some() && needed_bodies.len() < count {
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head = self.parents.get(&head.unwrap()).cloned();
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if let Some(head) = head {
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match self.blocks.get(&head) {
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Some(block) if block.body.is_none() && !self.downloading_bodies.contains(&head) => {
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needed_bodies.push(head.clone());
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}
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_ => (),
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}
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}
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}
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self.downloading_bodies.extend(needed_bodies.iter());
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needed_bodies
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}
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/// Returns a set of block hashes that require a header download. The returned set is marked as being downloaded.
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pub fn needed_headers(&mut self, count: usize, ignore_downloading: bool) -> Option<(H256, usize)> {
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// find subchain to download
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let mut download = None;
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{
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for h in &self.heads {
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if ignore_downloading || !self.downloading_headers.contains(&h) {
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self.downloading_headers.insert(h.clone());
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download = Some(h.clone());
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break;
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}
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}
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}
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download.map(|h| (h, count))
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}
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/// Unmark a header as being downloaded.
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pub fn clear_header_download(&mut self, hash: &H256) {
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self.downloading_headers.remove(hash);
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}
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/// Unmark a block body as being downloaded.
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pub fn clear_body_download(&mut self, hash: &H256) {
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self.downloading_bodies.remove(hash);
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}
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/// Get a valid chain of blocks ordered in descending order and ready for importing into blockchain.
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pub fn drain(&mut self) -> Vec<Bytes> {
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if self.blocks.is_empty() || self.head.is_none() {
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return Vec::new();
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}
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let mut drained = Vec::new();
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let mut hashes = Vec::new();
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{
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let mut blocks = Vec::new();
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let mut head = self.head;
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while head.is_some() {
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head = self.parents.get(&head.unwrap()).cloned();
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if let Some(head) = head {
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match self.blocks.get(&head) {
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Some(block) if block.body.is_some() => {
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blocks.push(block);
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hashes.push(head);
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self.head = Some(head);
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}
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_ => break,
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}
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}
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}
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for block in blocks.drain(..) {
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let mut block_rlp = RlpStream::new_list(3);
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block_rlp.append_raw(&block.header, 1);
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let body = Rlp::new(&block.body.as_ref().unwrap()); // incomplete blocks are filtered out in the loop above
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block_rlp.append_raw(body.at(0).as_raw(), 1);
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block_rlp.append_raw(body.at(1).as_raw(), 1);
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drained.push(block_rlp.out());
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}
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}
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for h in hashes {
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self.blocks.remove(&h);
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}
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trace!("Drained {} blocks, new head :{:?}", drained.len(), self.head);
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drained
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}
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/// Check if the collection is empty. We consider the syncing round complete once
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/// there is no block data left and only a single or none head pointer remains.
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pub fn is_empty(&self) -> bool {
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return self.heads.len() == 0 ||
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(self.heads.len() == 1 && self.head.map_or(false, |h| h == self.heads[0]))
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}
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/// Chech is collection contains a block header.
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pub fn contains(&self, hash: &H256) -> bool {
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self.blocks.contains_key(hash)
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}
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/// Return heap size.
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pub fn heap_size(&self) -> usize {
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//TODO: other collections
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self.blocks.heap_size_of_children()
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}
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/// Check if given block hash is marked as being downloaded.
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pub fn is_downloading(&self, hash: &H256) -> bool {
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self.downloading_headers.contains(hash) || self.downloading_bodies.contains(hash)
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}
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fn insert_body(&mut self, b: Bytes) -> Result<(), UtilError> {
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let body = UntrustedRlp::new(&b);
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let tx = try!(body.at(0));
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let tx_root = ordered_trie_root(tx.iter().map(|r| r.as_raw().to_vec()).collect()); //TODO: get rid of vectors here
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let uncles = try!(body.at(1)).as_raw().sha3();
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let header_id = HeaderId {
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transactions_root: tx_root,
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uncles: uncles
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};
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match self.header_ids.get(&header_id).cloned() {
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Some(h) => {
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self.header_ids.remove(&header_id);
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self.downloading_bodies.remove(&h);
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match self.blocks.get_mut(&h) {
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Some(ref mut block) => {
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trace!(target: "sync", "Got body {}", h);
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block.body = Some(body.as_raw().to_vec());
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},
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None => warn!("Got body with no header {}", h)
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}
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}
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None => trace!(target: "sync", "Ignored unknown/stale block body")
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};
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Ok(())
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}
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fn insert_header(&mut self, header: Bytes) -> Result<H256, UtilError> {
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let info: BlockHeader = try!(UntrustedRlp::new(&header).as_val());
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let hash = info.hash();
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if self.blocks.contains_key(&hash) {
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return Ok(hash);
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}
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match self.head {
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None if hash == self.heads[0] => {
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trace!("New head {}", hash);
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self.head = Some(info.parent_hash);
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},
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_ => ()
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}
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let mut block = SyncBlock {
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header: header,
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body: None,
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};
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let header_id = HeaderId {
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transactions_root: info.transactions_root,
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uncles: info.uncles_hash
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};
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if header_id.transactions_root == rlp::SHA3_NULL_RLP && header_id.uncles == rlp::SHA3_EMPTY_LIST_RLP {
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// empty body, just mark as downloaded
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let mut body_stream = RlpStream::new_list(2);
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body_stream.append_raw(&rlp::NULL_RLP, 1);
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body_stream.append_raw(&rlp::EMPTY_LIST_RLP, 1);
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block.body = Some(body_stream.out());
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}
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else {
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self.header_ids.insert(header_id, hash.clone());
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}
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self.parents.insert(info.parent_hash.clone(), hash.clone());
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self.blocks.insert(hash.clone(), block);
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Ok(hash)
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}
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// update subchain headers
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fn update_heads(&mut self) {
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let mut new_heads = Vec::new();
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let old_subchains: HashSet<_> = { self.heads.iter().map(Clone::clone).collect() };
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for s in self.heads.drain(..) {
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let mut h = s.clone();
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loop {
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match self.parents.get(&h) {
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Some(next) => {
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h = next.clone();
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if old_subchains.contains(&h) {
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trace!("Completed subchain {:?}", s);
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break; // reached head of the other subchain, merge by not adding
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}
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},
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_ => {
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new_heads.push(h);
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break;
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}
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}
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}
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}
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self.heads = new_heads;
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}
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}
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#[cfg(test)]
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mod test {
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use super::BlockCollection;
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use ethcore::client::{TestBlockChainClient, EachBlockWith, BlockId, BlockChainClient};
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use ethcore::views::HeaderView;
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use ethcore::header::BlockNumber;
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use util::*;
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fn is_empty(bc: &BlockCollection) -> bool {
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bc.heads.is_empty() &&
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bc.blocks.is_empty() &&
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bc.parents.is_empty() &&
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bc.header_ids.is_empty() &&
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bc.head.is_none() &&
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bc.downloading_headers.is_empty() &&
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bc.downloading_bodies.is_empty()
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}
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#[test]
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fn create_clear() {
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let mut bc = BlockCollection::new();
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assert!(is_empty(&bc));
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let client = TestBlockChainClient::new();
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client.add_blocks(100, EachBlockWith::Nothing);
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let hashes = (0 .. 100).map(|i| (&client as &BlockChainClient).block_hash(BlockId::Number(i)).unwrap()).collect();
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bc.reset_to(hashes);
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assert!(!is_empty(&bc));
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bc.clear();
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assert!(is_empty(&bc));
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}
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#[test]
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fn insert_headers() {
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let mut bc = BlockCollection::new();
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assert!(is_empty(&bc));
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let client = TestBlockChainClient::new();
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let nblocks = 200;
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client.add_blocks(nblocks, EachBlockWith::Nothing);
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let blocks: Vec<_> = (0 .. nblocks).map(|i| (&client as &BlockChainClient).block(BlockId::Number(i as BlockNumber)).unwrap()).collect();
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let headers: Vec<_> = blocks.iter().map(|b| Rlp::new(b).at(0).as_raw().to_vec()).collect();
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let hashes: Vec<_> = headers.iter().map(|h| HeaderView::new(h).sha3()).collect();
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let heads: Vec<_> = hashes.iter().enumerate().filter_map(|(i, h)| if i % 20 == 0 { Some(h.clone()) } else { None }).collect();
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bc.reset_to(heads);
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assert!(!bc.is_empty());
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assert_eq!(hashes[0], bc.heads[0]);
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assert!(bc.needed_bodies(1, false).is_empty());
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assert!(!bc.contains(&hashes[0]));
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assert!(!bc.is_downloading(&hashes[0]));
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let (h, n) = bc.needed_headers(6, false).unwrap();
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assert!(bc.is_downloading(&hashes[0]));
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assert_eq!(hashes[0], h);
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assert_eq!(n, 6);
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assert_eq!(bc.downloading_headers.len(), 1);
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assert!(bc.drain().is_empty());
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bc.insert_headers(headers[0..6].to_vec());
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assert_eq!(hashes[5], bc.heads[0]);
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for h in &hashes[0..6] {
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bc.clear_header_download(h)
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}
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assert_eq!(bc.downloading_headers.len(), 0);
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assert!(!bc.is_downloading(&hashes[0]));
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assert!(bc.contains(&hashes[0]));
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assert_eq!(&bc.drain()[..], &blocks[0..6]);
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assert!(!bc.contains(&hashes[0]));
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assert_eq!(hashes[5], bc.head.unwrap());
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let (h, _) = bc.needed_headers(6, false).unwrap();
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assert_eq!(hashes[5], h);
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let (h, _) = bc.needed_headers(6, false).unwrap();
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assert_eq!(hashes[20], h);
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bc.insert_headers(headers[10..16].to_vec());
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assert!(bc.drain().is_empty());
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bc.insert_headers(headers[5..10].to_vec());
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assert_eq!(&bc.drain()[..], &blocks[6..16]);
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assert_eq!(hashes[15], bc.heads[0]);
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bc.insert_headers(headers[16..].to_vec());
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bc.drain();
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assert!(bc.is_empty());
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}
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#[test]
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fn insert_headers_with_gap() {
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let mut bc = BlockCollection::new();
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assert!(is_empty(&bc));
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let client = TestBlockChainClient::new();
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let nblocks = 200;
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client.add_blocks(nblocks, EachBlockWith::Nothing);
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let blocks: Vec<_> = (0 .. nblocks).map(|i| (&client as &BlockChainClient).block(BlockId::Number(i as BlockNumber)).unwrap()).collect();
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let headers: Vec<_> = blocks.iter().map(|b| Rlp::new(b).at(0).as_raw().to_vec()).collect();
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let hashes: Vec<_> = headers.iter().map(|h| HeaderView::new(h).sha3()).collect();
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let heads: Vec<_> = hashes.iter().enumerate().filter_map(|(i, h)| if i % 20 == 0 { Some(h.clone()) } else { None }).collect();
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bc.reset_to(heads);
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bc.insert_headers(headers[2..22].to_vec());
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assert_eq!(hashes[0], bc.heads[0]);
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assert_eq!(hashes[21], bc.heads[1]);
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assert!(bc.head.is_none());
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bc.insert_headers(headers[0..2].to_vec());
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assert!(bc.head.is_some());
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assert_eq!(hashes[21], bc.heads[0]);
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}
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}
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