openethereum/sync/src/chain.rs
2016-06-20 17:28:48 +02:00

1839 lines
66 KiB
Rust
Raw Blame History

This file contains ambiguous Unicode characters

This file contains Unicode characters that might be confused with other characters. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

// 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/>.
///
/// `BlockChain` synchronization strategy.
/// Syncs to peers and keeps up to date.
/// This implementation uses ethereum protocol v63
///
/// Syncing strategy summary.
/// Split the chain into ranges of N blocks each. Download ranges sequentially. Split each range into subchains of M blocks. Download subchains in parallel.
/// State.
/// Sync state consists of the following data:
/// - s: State enum which can be one of the following values: `ChainHead`, `Blocks`, `Idle`
/// - H: A set of downloaded block headers
/// - B: A set of downloaded block bodies
/// - S: Set of block subchain start block hashes to download.
/// - l: Last imported / common block hash
/// - P: A set of connected peers. For each peer we maintain its last known total difficulty and starting block hash being requested if any.
/// General behaviour.
/// We start with all sets empty, l is set to the best block in the block chain, s is set to `ChainHead`.
/// If at any moment a bad block is reported by the block queue, we set s to `ChainHead`, reset l to the best block in the block chain and clear H, B and S.
/// If at any moment P becomes empty, we set s to `ChainHead`, and clear H, B and S.
///
/// Workflow for `ChainHead` state.
/// In this state we try to get subchain headers with a single `GetBlockHeaders` request.
/// On `NewPeer` / On `Restart`:
/// If peer's total difficulty is higher, request N/M headers with interval M+1 starting from l
/// On `BlockHeaders(R)`:
/// If R is empty:
/// If l is equal to genesis block hash or l is more than 1000 blocks behind our best hash:
/// Remove current peer from P. set l to the best block in the block chain. Select peer with maximum total difficulty from P and restart.
/// Else
/// Set l to ls parent and restart.
/// Else if we already have all the headers in the block chain or the block queue:
/// Set s to `Idle`,
/// Else
/// Set S to R, set s to `Blocks`.
///
///
/// All other messages are ignored.
/// Workflow for `Blocks` state.
/// In this state we download block headers and bodies from multiple peers.
/// On `NewPeer` / On `Restart`:
/// For all idle peers:
/// Find a set of 256 or less block hashes in H which are not in B and not being downloaded by other peers. If the set is not empty:
/// Request block bodies for the hashes in the set.
/// Else
/// Find an element in S which is not being downloaded by other peers. If found: Request M headers starting from the element.
///
/// On `BlockHeaders(R)`:
/// If R is empty remove current peer from P and restart.
/// Validate received headers. For each header find a parent in H or R or the blockchain. Restart if there is a block with unknown parent.
/// Go to `CollectBlocks`.
///
/// On `BlockBodies(R)`:
/// If R is empty remove current peer from P and restart.
/// Add bodies with a matching header in H to B.
/// Go to `CollectBlocks`.
///
/// `CollectBlocks`:
/// Find a chain of blocks C in H starting from h where hs parent equals to l. The chain ends with the first block which does not have a body in B.
/// Add all blocks from the chain to the block queue. Remove them from H and B. Set l to the hash of the last block from C.
/// Update and merge subchain heads in S. For each h in S find a chain of blocks in B starting from h. Remove h from S. if the chain does not include an element from S add the end of the chain to S.
/// If H is empty and S contains a single element set s to `ChainHead`.
/// Restart.
///
/// All other messages are ignored.
/// Workflow for Idle state.
/// On `NewBlock`:
/// Import the block. If the block is unknown set s to `ChainHead` and restart.
/// On `NewHashes`:
/// Set s to `ChainHead` and restart.
///
/// All other messages are ignored.
///
use util::*;
use std::mem::{replace};
use ethcore::views::{HeaderView, BlockView};
use ethcore::header::{BlockNumber, Header as BlockHeader};
use ethcore::client::{BlockChainClient, BlockStatus, BlockID, BlockChainInfo};
use ethcore::error::*;
use ethcore::transaction::SignedTransaction;
use ethcore::block::Block;
use io::SyncIo;
use time;
use super::SyncConfig;
use blocks::BlockCollection;
known_heap_size!(0, PeerInfo);
type PacketDecodeError = DecoderError;
const PROTOCOL_VERSION: u8 = 63u8;
const MAX_BODIES_TO_SEND: usize = 256;
const MAX_HEADERS_TO_SEND: usize = 512;
const MAX_NODE_DATA_TO_SEND: usize = 1024;
const MAX_RECEIPTS_TO_SEND: usize = 1024;
const MAX_RECEIPTS_HEADERS_TO_SEND: usize = 256;
const MAX_HEADERS_TO_REQUEST: usize = 128;
const MAX_BODIES_TO_REQUEST: usize = 64;
const MIN_PEERS_PROPAGATION: usize = 4;
const MAX_PEERS_PROPAGATION: usize = 128;
const MAX_PEER_LAG_PROPAGATION: BlockNumber = 20;
const SUBCHAIN_SIZE: usize = 64;
const MAX_ROUND_PARENTS: usize = 32;
const MAX_NEW_HASHES: usize = 64;
const MAX_TX_TO_IMPORT: usize = 512;
const STATUS_PACKET: u8 = 0x00;
const NEW_BLOCK_HASHES_PACKET: u8 = 0x01;
const TRANSACTIONS_PACKET: u8 = 0x02;
const GET_BLOCK_HEADERS_PACKET: u8 = 0x03;
const BLOCK_HEADERS_PACKET: u8 = 0x04;
const GET_BLOCK_BODIES_PACKET: u8 = 0x05;
const BLOCK_BODIES_PACKET: u8 = 0x06;
const NEW_BLOCK_PACKET: u8 = 0x07;
const GET_NODE_DATA_PACKET: u8 = 0x0d;
const NODE_DATA_PACKET: u8 = 0x0e;
const GET_RECEIPTS_PACKET: u8 = 0x0f;
const RECEIPTS_PACKET: u8 = 0x10;
const CONNECTION_TIMEOUT_SEC: f64 = 15f64;
#[derive(Copy, Clone, Eq, PartialEq, Debug)]
/// Sync state
pub enum SyncState {
/// Downloading subchain heads
ChainHead,
/// Initial chain sync complete. Waiting for new packets
Idle,
/// Block downloading paused. Waiting for block queue to process blocks and free some space
Waiting,
/// Downloading blocks
Blocks,
/// Downloading blocks learned from `NewHashes` packet
NewBlocks,
}
/// Syncing status and statistics
#[derive(Clone)]
pub struct SyncStatus {
/// State
pub state: SyncState,
/// Syncing protocol version. That's the maximum protocol version we connect to.
pub protocol_version: u8,
/// The underlying p2p network version.
pub network_id: U256,
/// `BlockChain` height for the moment the sync started.
pub start_block_number: BlockNumber,
/// Last fully downloaded and imported block number (if any).
pub last_imported_block_number: Option<BlockNumber>,
/// Highest block number in the download queue (if any).
pub highest_block_number: Option<BlockNumber>,
/// Total number of blocks for the sync process.
pub blocks_total: BlockNumber,
/// Number of blocks downloaded so far.
pub blocks_received: BlockNumber,
/// Total number of connected peers
pub num_peers: usize,
/// Total number of active peers
pub num_active_peers: usize,
/// Heap memory used in bytes
pub mem_used: usize,
}
#[derive(PartialEq, Eq, Debug, Clone)]
/// Peer data type requested
enum PeerAsking {
Nothing,
BlockHeaders,
BlockBodies,
Heads,
}
#[derive(Clone)]
/// Syncing peer information
struct PeerInfo {
/// eth protocol version
protocol_version: u32,
/// Peer chain genesis hash
genesis: H256,
/// Peer network id
network_id: U256,
/// Peer best block hash
latest_hash: H256,
/// Peer best block number if known
latest_number: Option<BlockNumber>,
/// Peer total difficulty if known
difficulty: Option<U256>,
/// Type of data currenty being requested from peer.
asking: PeerAsking,
/// A set of block numbers being requested
asking_blocks: Vec<H256>,
/// Holds requested header hash if currently requesting block header by hash
asking_hash: Option<H256>,
/// Request timestamp
ask_time: f64,
}
/// Blockchain sync handler.
/// See module documentation for more details.
pub struct ChainSync {
/// Sync state
state: SyncState,
/// Last block number for the start of sync
starting_block: BlockNumber,
/// Highest block number seen
highest_block: Option<BlockNumber>,
/// All connected peers
peers: HashMap<PeerId, PeerInfo>,
/// Peers active for current sync round
active_peers: HashSet<PeerId>,
/// Downloaded blocks, holds `H`, `B` and `S`
blocks: BlockCollection,
/// Last impoted block number
last_imported_block: BlockNumber,
/// Last impoted block hash
last_imported_hash: H256,
/// Syncing total difficulty
syncing_difficulty: U256,
/// Last propagated block number
last_sent_block_number: BlockNumber,
/// Max blocks to download ahead
_max_download_ahead_blocks: usize,
/// Number of blocks imported this round
imported_this_round: Option<usize>,
/// Block parents imported this round (hash, parent)
round_parents: VecDeque<(H256, H256)>,
/// Network ID
network_id: U256,
}
type RlpResponseResult = Result<Option<(PacketId, RlpStream)>, PacketDecodeError>;
impl ChainSync {
/// Create a new instance of syncing strategy.
pub fn new(config: SyncConfig, chain: &BlockChainClient) -> ChainSync {
let chain = chain.chain_info();
let mut sync = ChainSync {
state: SyncState::ChainHead,
starting_block: chain.best_block_number,
highest_block: None,
last_imported_block: chain.best_block_number,
last_imported_hash: chain.best_block_hash,
peers: HashMap::new(),
active_peers: HashSet::new(),
blocks: BlockCollection::new(),
syncing_difficulty: U256::from(0u64),
last_sent_block_number: 0,
imported_this_round: None,
round_parents: VecDeque::new(),
_max_download_ahead_blocks: max(MAX_HEADERS_TO_REQUEST, config.max_download_ahead_blocks),
network_id: config.network_id,
};
sync.reset();
sync
}
/// @returns Synchonization status
pub fn status(&self) -> SyncStatus {
SyncStatus {
state: self.state.clone(),
protocol_version: 63,
network_id: self.network_id,
start_block_number: self.starting_block,
last_imported_block_number: Some(self.last_imported_block),
highest_block_number: self.highest_block.map(|n| max(n, self.last_imported_block)),
blocks_received: if self.last_imported_block > self.starting_block { self.last_imported_block - self.starting_block } else { 0 },
blocks_total: match self.highest_block { Some(x) if x > self.starting_block => x - self.starting_block, _ => 0 },
num_peers: self.peers.len(),
num_active_peers: self.peers.values().filter(|p| p.asking != PeerAsking::Nothing).count(),
mem_used:
self.blocks.heap_size()
+ self.peers.heap_size_of_children()
+ self.round_parents.heap_size_of_children(),
}
}
/// Abort all sync activity
pub fn abort(&mut self, io: &mut SyncIo) {
self.restart(io);
self.peers.clear();
}
#[cfg_attr(feature="dev", allow(for_kv_map))] // Because it's not possible to get `values_mut()`
/// Reset sync. Clear all downloaded data but keep the queue
fn reset(&mut self) {
self.blocks.clear();
for (_, ref mut p) in &mut self.peers {
p.asking_blocks.clear();
p.asking_hash = None;
}
self.syncing_difficulty = From::from(0u64);
self.state = SyncState::Idle;
self.blocks.clear();
self.active_peers = self.peers.keys().cloned().collect();
}
/// Restart sync
pub fn restart(&mut self, io: &mut SyncIo) {
trace!(target: "sync", "Restarting");
self.reset();
self.start_sync_round(io);
self.continue_sync(io);
}
/// Remove peer from active peer set
fn deactivate_peer(&mut self, io: &mut SyncIo, peer_id: PeerId) {
trace!(target: "sync", "Deactivating peer {}", peer_id);
self.active_peers.remove(&peer_id);
if self.active_peers.is_empty() {
trace!(target: "sync", "No more active peers");
if self.state == SyncState::ChainHead {
self.complete_sync();
} else {
self.restart(io);
}
}
}
/// Restart sync after bad block has been detected. May end up re-downloading up to QUEUE_SIZE blocks
fn restart_on_bad_block(&mut self, io: &mut SyncIo) {
// Do not assume that the block queue/chain still has our last_imported_block
let chain = io.chain().chain_info();
self.last_imported_block = chain.best_block_number;
self.last_imported_hash = chain.best_block_hash;
self.restart(io);
}
/// Called by peer to report status
fn on_peer_status(&mut self, io: &mut SyncIo, peer_id: PeerId, r: &UntrustedRlp) -> Result<(), PacketDecodeError> {
let peer = PeerInfo {
protocol_version: try!(r.val_at(0)),
network_id: try!(r.val_at(1)),
difficulty: Some(try!(r.val_at(2))),
latest_hash: try!(r.val_at(3)),
latest_number: None,
genesis: try!(r.val_at(4)),
asking: PeerAsking::Nothing,
asking_blocks: Vec::new(),
asking_hash: None,
ask_time: 0f64,
};
trace!(target: "sync", "New peer {} (protocol: {}, network: {:?}, difficulty: {:?}, latest:{}, genesis:{})", peer_id, peer.protocol_version, peer.network_id, peer.difficulty, peer.latest_hash, peer.genesis);
if io.is_expired() {
trace!(target: "sync", "Status packet from expired session {}:{}", peer_id, io.peer_info(peer_id));
return Ok(());
}
if self.peers.contains_key(&peer_id) {
debug!(target: "sync", "Unexpected status packet from {}:{}", peer_id, io.peer_info(peer_id));
return Ok(());
}
let chain_info = io.chain().chain_info();
if peer.genesis != chain_info.genesis_hash {
io.disable_peer(peer_id);
trace!(target: "sync", "Peer {} genesis hash mismatch (ours: {}, theirs: {})", peer_id, chain_info.genesis_hash, peer.genesis);
return Ok(());
}
if peer.network_id != self.network_id {
io.disable_peer(peer_id);
trace!(target: "sync", "Peer {} network id mismatch (ours: {}, theirs: {})", peer_id, self.network_id, peer.network_id);
return Ok(());
}
self.peers.insert(peer_id.clone(), peer);
self.active_peers.insert(peer_id.clone());
debug!(target: "sync", "Connected {}:{}", peer_id, io.peer_info(peer_id));
self.sync_peer(io, peer_id, false);
Ok(())
}
#[cfg_attr(feature="dev", allow(cyclomatic_complexity))]
/// Called by peer once it has new block headers during sync
fn on_peer_block_headers(&mut self, io: &mut SyncIo, peer_id: PeerId, r: &UntrustedRlp) -> Result<(), PacketDecodeError> {
self.clear_peer_download(peer_id);
let expected_hash = self.peers.get(&peer_id).and_then(|p| p.asking_hash);
let expected_asking = if self.state == SyncState::ChainHead { PeerAsking::Heads } else { PeerAsking::BlockHeaders };
if !self.reset_peer_asking(peer_id, expected_asking) {
trace!(target: "sync", "Ignored unexpected headers");
self.continue_sync(io);
return Ok(());
}
let item_count = r.item_count();
trace!(target: "sync", "{} -> BlockHeaders ({} entries), state = {:?}", peer_id, item_count, self.state);
if self.state == SyncState::Idle {
trace!(target: "sync", "Ignored unexpected block headers");
self.continue_sync(io);
return Ok(());
}
if self.state == SyncState::Waiting {
trace!(target: "sync", "Ignored block headers while waiting");
self.continue_sync(io);
return Ok(());
}
if item_count == 0 && (self.state == SyncState::Blocks || self.state == SyncState::NewBlocks) {
self.deactivate_peer(io, peer_id); //TODO: is this too harsh?
self.continue_sync(io);
return Ok(());
}
let mut headers = Vec::new();
let mut hashes = Vec::new();
let mut valid_response = item_count == 0; //empty response is valid
for i in 0..item_count {
let info: BlockHeader = try!(r.val_at(i));
let number = BlockNumber::from(info.number);
// Check if any of the headers matches the hash we requested
if !valid_response {
if let Some(expected) = expected_hash {
valid_response = expected == info.hash()
}
}
if self.blocks.contains(&info.hash()) {
trace!(target: "sync", "Skipping existing block header {} ({:?})", number, info.hash());
continue;
}
if self.highest_block == None || number > self.highest_block.unwrap() {
self.highest_block = Some(number);
}
let hash = info.hash();
match io.chain().block_status(BlockID::Hash(hash.clone())) {
BlockStatus::InChain | BlockStatus::Queued => {
match self.state {
SyncState::Blocks | SyncState::NewBlocks => trace!(target: "sync", "Header already in chain {} ({})", number, hash),
_ => trace!(target: "sync", "Unexpected header already in chain {} ({}), state = {:?}", number, hash, self.state),
}
headers.push(try!(r.at(i)).as_raw().to_vec());
hashes.push(hash);
},
BlockStatus::Bad => {
warn!(target: "sync", "Bad header {} ({}) from {}: {}, state = {:?}", number, hash, peer_id, io.peer_info(peer_id), self.state);
io.disable_peer(peer_id);
return Ok(());
},
BlockStatus::Unknown => {
headers.push(try!(r.at(i)).as_raw().to_vec());
hashes.push(hash);
}
}
}
// Disable the peer for this syncing round if it gives invalid chain
if !valid_response {
trace!(target: "sync", "{} Deactivated for invalid headers response", peer_id);
self.deactivate_peer(io, peer_id);
}
if headers.is_empty() {
// Peer does not have any new subchain heads, deactivate it nd try with another
trace!(target: "sync", "{} Deactivated for no data", peer_id);
self.deactivate_peer(io, peer_id);
}
match self.state {
SyncState::ChainHead => {
if headers.is_empty() {
// peer is not on our chain
// track back and try again
self.imported_this_round = Some(0);
self.start_sync_round(io);
} else {
// TODO: validate heads better. E.g. check that there is enough distance between blocks.
trace!(target: "sync", "Received {} subchain heads, proceeding to download", headers.len());
self.blocks.reset_to(hashes);
self.state = SyncState::Blocks;
}
},
SyncState::Blocks | SyncState::NewBlocks | SyncState::Waiting => {
trace!(target: "sync", "Inserted {} headers", headers.len());
self.blocks.insert_headers(headers);
},
_ => trace!(target: "sync", "Unexpected headers({}) from {} ({}), state = {:?}", headers.len(), peer_id, io.peer_info(peer_id), self.state)
}
self.collect_blocks(io);
self.continue_sync(io);
Ok(())
}
/// Called by peer once it has new block bodies
fn on_peer_block_bodies(&mut self, io: &mut SyncIo, peer_id: PeerId, r: &UntrustedRlp) -> Result<(), PacketDecodeError> {
self.clear_peer_download(peer_id);
self.reset_peer_asking(peer_id, PeerAsking::BlockBodies);
let item_count = r.item_count();
trace!(target: "sync", "{} -> BlockBodies ({} entries)", peer_id, item_count);
if item_count == 0 {
self.deactivate_peer(io, peer_id);
}
else if self.state != SyncState::Blocks && self.state != SyncState::NewBlocks && self.state != SyncState::Waiting {
trace!(target: "sync", "Ignored unexpected block bodies");
}
else if self.state == SyncState::Waiting {
trace!(target: "sync", "Ignored block bodies while waiting");
}
else
{
let mut bodies = Vec::with_capacity(item_count);
for i in 0..item_count {
bodies.push(try!(r.at(i)).as_raw().to_vec());
}
if self.blocks.insert_bodies(bodies) != item_count {
trace!(target: "sync", "Deactivating peer for giving invalid block bodies");
self.deactivate_peer(io, peer_id);
}
self.collect_blocks(io);
}
self.continue_sync(io);
Ok(())
}
/// Called by peer once it has new block bodies
#[cfg_attr(feature="dev", allow(cyclomatic_complexity))]
fn on_peer_new_block(&mut self, io: &mut SyncIo, peer_id: PeerId, r: &UntrustedRlp) -> Result<(), PacketDecodeError> {
let block_rlp = try!(r.at(0));
let header_rlp = try!(block_rlp.at(0));
let h = header_rlp.as_raw().sha3();
trace!(target: "sync", "{} -> NewBlock ({})", peer_id, h);
if self.state != SyncState::Idle {
trace!(target: "sync", "NewBlock ignored while seeking");
return Ok(());
}
let header: BlockHeader = try!(header_rlp.as_val());
let mut unknown = false;
{
let peer = self.peers.get_mut(&peer_id).unwrap();
peer.latest_hash = header.hash();
peer.latest_number = Some(header.number());
}
if header.number <= self.last_imported_block + 1 {
match io.chain().import_block(block_rlp.as_raw().to_vec()) {
Err(Error::Import(ImportError::AlreadyInChain)) => {
trace!(target: "sync", "New block already in chain {:?}", h);
},
Err(Error::Import(ImportError::AlreadyQueued)) => {
trace!(target: "sync", "New block already queued {:?}", h);
},
Ok(_) => {
if header.number == self.last_imported_block + 1 {
self.last_imported_block = header.number;
self.last_imported_hash = header.hash();
}
trace!(target: "sync", "New block queued {:?} ({})", h, header.number);
},
Err(Error::Block(BlockError::UnknownParent(p))) => {
unknown = true;
trace!(target: "sync", "New block with unknown parent ({:?}) {:?}", p, h);
},
Err(e) => {
debug!(target: "sync", "Bad new block {:?} : {:?}", h, e);
io.disable_peer(peer_id);
}
};
}
else {
unknown = true;
}
if unknown {
trace!(target: "sync", "New unknown block {:?}", h);
//TODO: handle too many unknown blocks
let difficulty: U256 = try!(r.val_at(1));
if let Some(ref mut peer) = self.peers.get_mut(&peer_id) {
if peer.difficulty.map_or(true, |pd| difficulty > pd) {
//self.state = SyncState::ChainHead;
peer.difficulty = Some(difficulty);
trace!(target: "sync", "Received block {:?} with no known parent. Peer needs syncing...", h);
}
}
self.sync_peer(io, peer_id, true);
}
Ok(())
}
/// Handles `NewHashes` packet. Initiates headers download for any unknown hashes.
fn on_peer_new_hashes(&mut self, io: &mut SyncIo, peer_id: PeerId, r: &UntrustedRlp) -> Result<(), PacketDecodeError> {
if self.state != SyncState::Idle {
trace!(target: "sync", "Ignoring new hashes since we're already downloading.");
return Ok(());
}
trace!(target: "sync", "{} -> NewHashes ({} entries)", peer_id, r.item_count());
let hashes = r.iter().take(MAX_NEW_HASHES).map(|item| (item.val_at::<H256>(0), item.val_at::<BlockNumber>(1)));
let mut max_height: BlockNumber = 0;
let mut new_hashes = Vec::new();
for (rh, rd) in hashes {
let h = try!(rh);
let d = try!(rd);
if self.blocks.is_downloading(&h) {
continue;
}
match io.chain().block_status(BlockID::Hash(h.clone())) {
BlockStatus::InChain => {
trace!(target: "sync", "New block hash already in chain {:?}", h);
},
BlockStatus::Queued => {
trace!(target: "sync", "New hash block already queued {:?}", h);
},
BlockStatus::Unknown => {
new_hashes.push(h.clone());
if d > max_height {
trace!(target: "sync", "New unknown block hash {:?}", h);
let peer = self.peers.get_mut(&peer_id).unwrap();
peer.latest_hash = h.clone();
peer.latest_number = Some(d);
max_height = d;
}
},
BlockStatus::Bad => {
debug!(target: "sync", "Bad new block hash {:?}", h);
io.disable_peer(peer_id);
return Ok(());
}
}
};
if max_height != 0 {
trace!(target: "sync", "Downloading blocks for new hashes");
self.blocks.reset_to(new_hashes);
self.state = SyncState::NewBlocks;
self.sync_peer(io, peer_id, true);
}
Ok(())
}
/// Called by peer when it is disconnecting
pub fn on_peer_aborting(&mut self, io: &mut SyncIo, peer: PeerId) {
trace!(target: "sync", "== Disconnecting {}: {}", peer, io.peer_info(peer));
if self.peers.contains_key(&peer) {
debug!(target: "sync", "Disconnected {}", peer);
self.clear_peer_download(peer);
self.peers.remove(&peer);
self.active_peers.remove(&peer);
self.continue_sync(io);
}
}
/// Called when a new peer is connected
pub fn on_peer_connected(&mut self, io: &mut SyncIo, peer: PeerId) {
trace!(target: "sync", "== Connected {}: {}", peer, io.peer_info(peer));
if let Err(e) = self.send_status(io) {
debug!(target:"sync", "Error sending status request: {:?}", e);
io.disable_peer(peer);
}
}
/// Resume downloading
fn continue_sync(&mut self, io: &mut SyncIo) {
let mut peers: Vec<(PeerId, U256)> = self.peers.iter().map(|(k, p)| (*k, p.difficulty.unwrap_or_else(U256::zero))).collect();
peers.sort_by(|&(_, d1), &(_, d2)| d1.cmp(&d2).reverse()); //TODO: sort by rating
trace!(target: "sync", "Syncing with {}/{} peers", self.active_peers.len(), peers.len());
for (p, _) in peers {
if self.active_peers.contains(&p) {
self.sync_peer(io, p, false);
}
}
if self.state != SyncState::Waiting && !self.peers.values().any(|p| p.asking != PeerAsking::Nothing) {
self.complete_sync();
}
}
/// Called after all blocks have been downloaded
fn complete_sync(&mut self) {
trace!(target: "sync", "Sync complete");
self.reset();
self.state = SyncState::Idle;
}
/// Enter waiting state
fn pause_sync(&mut self) {
trace!(target: "sync", "Block queue full, pausing sync");
self.state = SyncState::Waiting;
}
/// Find something to do for a peer. Called for a new peer or when a peer is done with it's task.
fn sync_peer(&mut self, io: &mut SyncIo, peer_id: PeerId, force: bool) {
let (peer_latest, peer_difficulty) = {
let peer = self.peers.get_mut(&peer_id).unwrap();
if peer.asking != PeerAsking::Nothing {
return;
}
if self.state == SyncState::Waiting {
trace!(target: "sync", "Waiting for the block queue");
return;
}
(peer.latest_hash.clone(), peer.difficulty.clone())
};
let chain_info = io.chain().chain_info();
let td = chain_info.pending_total_difficulty;
let syncing_difficulty = max(self.syncing_difficulty, td);
if force || self.state == SyncState::NewBlocks || peer_difficulty.map_or(true, |pd| pd > syncing_difficulty) {
match self.state {
SyncState::Idle => {
if self.last_imported_block < chain_info.best_block_number {
self.last_imported_block = chain_info.best_block_number;
self.last_imported_hash = chain_info.best_block_hash;
}
trace!(target: "sync", "Starting sync with {}", peer_id);
self.start_sync_round(io);
self.sync_peer(io, peer_id, force);
},
SyncState::ChainHead => {
// Request subchain headers
trace!(target: "sync", "Starting sync with better chain");
let last = self.last_imported_hash.clone();
self.request_headers_by_hash(io, peer_id, &last, SUBCHAIN_SIZE, MAX_HEADERS_TO_REQUEST - 1, false, PeerAsking::Heads);
},
SyncState::Blocks | SyncState::NewBlocks => {
if io.chain().block_status(BlockID::Hash(peer_latest)) == BlockStatus::Unknown {
self.request_blocks(io, peer_id, false);
}
}
SyncState::Waiting => ()
}
}
}
fn start_sync_round(&mut self, io: &mut SyncIo) {
self.state = SyncState::ChainHead;
trace!(target: "sync", "Starting round (last imported count = {:?}, block = {:?}", self.imported_this_round, self.last_imported_block);
// Check if need to retract to find the common block. The problem is that the peers still return headers by hash even
// from the non-canonical part of the tree. So we also retract if nothing has been imported last round.
match self.imported_this_round {
Some(n) if n == 0 && self.last_imported_block > 0 => {
// nothing was imported last round, step back to a previous block
// search parent in last round known parents first
if let Some(&(_, p)) = self.round_parents.iter().find(|&&(h, _)| h == self.last_imported_hash) {
self.last_imported_block -= 1;
self.last_imported_hash = p.clone();
trace!(target: "sync", "Searching common header from the last round {} ({})", self.last_imported_block, self.last_imported_hash);
} else {
match io.chain().block_hash(BlockID::Number(self.last_imported_block - 1)) {
Some(h) => {
self.last_imported_block -= 1;
self.last_imported_hash = h;
trace!(target: "sync", "Searching common header in the blockchain {} ({})", self.last_imported_block, self.last_imported_hash);
}
None => {
debug!(target: "sync", "Could not revert to previous block, last: {} ({})", self.last_imported_block, self.last_imported_hash);
}
}
}
},
_ => (),
}
self.imported_this_round = None;
}
/// Find some headers or blocks to download for a peer.
fn request_blocks(&mut self, io: &mut SyncIo, peer_id: PeerId, ignore_others: bool) {
self.clear_peer_download(peer_id);
if io.chain().queue_info().is_full() {
self.pause_sync();
return;
}
// check to see if we need to download any block bodies first
let needed_bodies = self.blocks.needed_bodies(MAX_BODIES_TO_REQUEST, ignore_others);
if !needed_bodies.is_empty() {
replace(&mut self.peers.get_mut(&peer_id).unwrap().asking_blocks, needed_bodies.clone());
self.request_bodies(io, peer_id, needed_bodies);
return;
}
// find subchain to download
if let Some((h, count)) = self.blocks.needed_headers(MAX_HEADERS_TO_REQUEST, ignore_others) {
replace(&mut self.peers.get_mut(&peer_id).unwrap().asking_blocks, vec![h.clone()]);
self.request_headers_by_hash(io, peer_id, &h, count, 0, false, PeerAsking::BlockHeaders);
}
}
/// Clear all blocks/headers marked as being downloaded by a peer.
fn clear_peer_download(&mut self, peer_id: PeerId) {
let peer = self.peers.get_mut(&peer_id).unwrap();
match peer.asking {
PeerAsking::BlockHeaders | PeerAsking::Heads => {
for b in &peer.asking_blocks {
self.blocks.clear_header_download(b);
}
},
PeerAsking::BlockBodies => {
for b in &peer.asking_blocks {
self.blocks.clear_body_download(b);
}
},
_ => (),
}
peer.asking_blocks.clear();
}
fn block_imported(&mut self, hash: &H256, number: BlockNumber, parent: &H256) {
self.last_imported_block = number;
self.last_imported_hash = hash.clone();
self.round_parents.push_back((hash.clone(), parent.clone()));
if self.round_parents.len() > MAX_ROUND_PARENTS {
self.round_parents.pop_front();
}
}
/// Checks if there are blocks fully downloaded that can be imported into the blockchain and does the import.
fn collect_blocks(&mut self, io: &mut SyncIo) {
let mut restart = false;
let mut imported = HashSet::new();
let blocks = self.blocks.drain();
let count = blocks.len();
for block in blocks {
let (h, number, parent) = {
let header = BlockView::new(&block).header_view();
(header.sha3(), header.number(), header.parent_hash())
};
// Perform basic block verification
if !Block::is_good(&block) {
debug!(target: "sync", "Bad block rlp {:?} : {:?}", h, block);
restart = true;
break;
}
match io.chain().import_block(block) {
Err(Error::Import(ImportError::AlreadyInChain)) => {
trace!(target: "sync", "Block already in chain {:?}", h);
self.block_imported(&h, number, &parent);
},
Err(Error::Import(ImportError::AlreadyQueued)) => {
trace!(target: "sync", "Block already queued {:?}", h);
self.block_imported(&h, number, &parent);
},
Ok(_) => {
trace!(target: "sync", "Block queued {:?}", h);
imported.insert(h.clone());
self.block_imported(&h, number, &parent);
},
Err(Error::Block(BlockError::UnknownParent(_))) if self.state == SyncState::NewBlocks => {
trace!(target: "sync", "Unknown new block parent, restarting sync");
break;
},
Err(e) => {
debug!(target: "sync", "Bad block {:?} : {:?}", h, e);
restart = true;
break;
}
}
}
trace!(target: "sync", "Imported {} of {}", imported.len(), count);
self.imported_this_round = Some(self.imported_this_round.unwrap_or(0) + imported.len());
if restart {
self.restart_on_bad_block(io);
return;
}
if self.blocks.is_empty() {
// complete sync round
trace!(target: "sync", "Sync round complete");
self.restart(io);
}
}
/// Request headers from a peer by block hash
#[cfg_attr(feature="dev", allow(too_many_arguments))]
fn request_headers_by_hash(&mut self, sync: &mut SyncIo, peer_id: PeerId, h: &H256, count: usize, skip: usize, reverse: bool, asking: PeerAsking) {
trace!(target: "sync", "{} <- GetBlockHeaders: {} entries starting from {}", peer_id, count, h);
let mut rlp = RlpStream::new_list(4);
rlp.append(h);
rlp.append(&count);
rlp.append(&skip);
rlp.append(&if reverse {1u32} else {0u32});
self.send_request(sync, peer_id, asking, GET_BLOCK_HEADERS_PACKET, rlp.out());
self.peers.get_mut(&peer_id)
.expect("peer_id may originate either from on_packet, where it is already validated or from enumerating self.peers. qed")
.asking_hash = Some(h.clone());
}
/// Request block bodies from a peer
fn request_bodies(&mut self, sync: &mut SyncIo, peer_id: PeerId, hashes: Vec<H256>) {
let mut rlp = RlpStream::new_list(hashes.len());
trace!(target: "sync", "{} <- GetBlockBodies: {} entries starting from {:?}", peer_id, hashes.len(), hashes.first());
for h in hashes {
rlp.append(&h);
}
self.send_request(sync, peer_id, PeerAsking::BlockBodies, GET_BLOCK_BODIES_PACKET, rlp.out());
}
/// Reset peer status after request is complete.
fn reset_peer_asking(&mut self, peer_id: PeerId, asking: PeerAsking) -> bool {
let peer = self.peers.get_mut(&peer_id).unwrap();
if peer.asking != asking {
trace!(target:"sync", "Asking {:?} while expected {:?}", peer.asking, asking);
peer.asking = PeerAsking::Nothing;
false
}
else {
peer.asking = PeerAsking::Nothing;
true
}
}
/// Generic request sender
fn send_request(&mut self, sync: &mut SyncIo, peer_id: PeerId, asking: PeerAsking, packet_id: PacketId, packet: Bytes) {
let peer = self.peers.get_mut(&peer_id).unwrap();
if peer.asking != PeerAsking::Nothing {
warn!(target:"sync", "Asking {:?} while requesting {:?}", peer.asking, asking);
}
peer.asking = asking;
peer.ask_time = time::precise_time_s();
if let Err(e) = sync.send(peer_id, packet_id, packet) {
debug!(target:"sync", "Error sending request: {:?}", e);
sync.disable_peer(peer_id);
}
}
/// Generic packet sender
fn send_packet(&mut self, sync: &mut SyncIo, peer_id: PeerId, packet_id: PacketId, packet: Bytes) {
if let Err(e) = sync.send(peer_id, packet_id, packet) {
debug!(target:"sync", "Error sending packet: {:?}", e);
sync.disable_peer(peer_id);
}
}
/// Called when peer sends us new transactions
fn on_peer_transactions(&mut self, io: &mut SyncIo, peer_id: PeerId, r: &UntrustedRlp) -> Result<(), PacketDecodeError> {
// accepting transactions once only fully synced
if !io.is_chain_queue_empty() {
return Ok(());
}
let item_count = r.item_count();
trace!(target: "sync", "{} -> Transactions ({} entries)", peer_id, item_count);
let mut transactions = Vec::with_capacity(item_count);
for i in 0 .. min(item_count, MAX_TX_TO_IMPORT) {
let tx: SignedTransaction = try!(r.val_at(i));
transactions.push(tx);
}
let _ = io.chain().import_transactions(transactions);
Ok(())
}
/// Send Status message
fn send_status(&mut self, io: &mut SyncIo) -> Result<(), UtilError> {
let mut packet = RlpStream::new_list(5);
let chain = io.chain().chain_info();
packet.append(&(PROTOCOL_VERSION as u32));
packet.append(&self.network_id);
packet.append(&chain.total_difficulty);
packet.append(&chain.best_block_hash);
packet.append(&chain.genesis_hash);
io.respond(STATUS_PACKET, packet.out())
}
/// Respond to GetBlockHeaders request
fn return_block_headers(io: &SyncIo, r: &UntrustedRlp, peer_id: PeerId) -> RlpResponseResult {
// Packet layout:
// [ block: { P , B_32 }, maxHeaders: P, skip: P, reverse: P in { 0 , 1 } ]
let max_headers: usize = try!(r.val_at(1));
let skip: usize = try!(r.val_at(2));
let reverse: bool = try!(r.val_at(3));
let last = io.chain().chain_info().best_block_number;
let number = if try!(r.at(0)).size() == 32 {
// id is a hash
let hash: H256 = try!(r.val_at(0));
trace!(target: "sync", "{} -> GetBlockHeaders (hash: {}, max: {}, skip: {}, reverse:{})", peer_id, hash, max_headers, skip, reverse);
match io.chain().block_header(BlockID::Hash(hash)) {
Some(hdr) => {
let number = From::from(HeaderView::new(&hdr).number());
debug_assert_eq!(HeaderView::new(&hdr).sha3(), hash);
if max_headers == 1 || io.chain().block_hash(BlockID::Number(number)) != Some(hash) {
// Non canonical header or single header requested
// TODO: handle single-step reverse hashchains of non-canon hashes
trace!(target:"sync", "Returning single header: {:?}", hash);
let mut rlp = RlpStream::new_list(1);
rlp.append_raw(&hdr, 1);
return Ok(Some((BLOCK_HEADERS_PACKET, rlp)));
}
number
}
None => return Ok(Some((BLOCK_HEADERS_PACKET, RlpStream::new_list(0)))) //no such header, return nothing
}
} else {
trace!(target: "sync", "{} -> GetBlockHeaders (number: {}, max: {}, skip: {}, reverse:{})", peer_id, try!(r.val_at::<BlockNumber>(0)), max_headers, skip, reverse);
try!(r.val_at(0))
};
let mut number = if reverse {
min(last, number)
} else {
max(0, number)
};
let max_count = min(MAX_HEADERS_TO_SEND, max_headers);
let mut count = 0;
let mut data = Bytes::new();
let inc = (skip + 1) as BlockNumber;
while number <= last && count < max_count {
if let Some(mut hdr) = io.chain().block_header(BlockID::Number(number)) {
data.append(&mut hdr);
count += 1;
}
if reverse {
if number <= inc || number == 0 {
break;
}
number -= inc;
}
else {
number += inc;
}
}
let mut rlp = RlpStream::new_list(count as usize);
rlp.append_raw(&data, count as usize);
trace!(target: "sync", "-> GetBlockHeaders: returned {} entries", count);
Ok(Some((BLOCK_HEADERS_PACKET, rlp)))
}
/// Respond to GetBlockBodies request
fn return_block_bodies(io: &SyncIo, r: &UntrustedRlp, peer_id: PeerId) -> RlpResponseResult {
let mut count = r.item_count();
if count == 0 {
debug!(target: "sync", "Empty GetBlockBodies request, ignoring.");
return Ok(None);
}
trace!(target: "sync", "{} -> GetBlockBodies: {} entries", peer_id, count);
count = min(count, MAX_BODIES_TO_SEND);
let mut added = 0usize;
let mut data = Bytes::new();
for i in 0..count {
if let Some(mut hdr) = io.chain().block_body(BlockID::Hash(try!(r.val_at::<H256>(i)))) {
data.append(&mut hdr);
added += 1;
}
}
let mut rlp = RlpStream::new_list(added);
rlp.append_raw(&data, added);
trace!(target: "sync", "-> GetBlockBodies: returned {} entries", added);
Ok(Some((BLOCK_BODIES_PACKET, rlp)))
}
/// Respond to GetNodeData request
fn return_node_data(io: &SyncIo, r: &UntrustedRlp, peer_id: PeerId) -> RlpResponseResult {
let mut count = r.item_count();
trace!(target: "sync", "{} -> GetNodeData: {} entries", peer_id, count);
if count == 0 {
debug!(target: "sync", "Empty GetNodeData request, ignoring.");
return Ok(None);
}
count = min(count, MAX_NODE_DATA_TO_SEND);
let mut added = 0usize;
let mut data = Bytes::new();
for i in 0..count {
if let Some(mut hdr) = io.chain().state_data(&try!(r.val_at::<H256>(i))) {
data.append(&mut hdr);
added += 1;
}
}
trace!(target: "sync", "{} -> GetNodeData: return {} entries", peer_id, added);
let mut rlp = RlpStream::new_list(added);
rlp.append_raw(&data, added);
Ok(Some((NODE_DATA_PACKET, rlp)))
}
fn return_receipts(io: &SyncIo, rlp: &UntrustedRlp, peer_id: PeerId) -> RlpResponseResult {
let mut count = rlp.item_count();
trace!(target: "sync", "{} -> GetReceipts: {} entries", peer_id, count);
if count == 0 {
debug!(target: "sync", "Empty GetReceipts request, ignoring.");
return Ok(None);
}
count = min(count, MAX_RECEIPTS_HEADERS_TO_SEND);
let mut added_headers = 0usize;
let mut added_receipts = 0usize;
let mut data = Bytes::new();
for i in 0..count {
if let Some(mut receipts_bytes) = io.chain().block_receipts(&try!(rlp.val_at::<H256>(i))) {
data.append(&mut receipts_bytes);
added_receipts += receipts_bytes.len();
added_headers += 1;
if added_receipts > MAX_RECEIPTS_TO_SEND { break; }
}
}
let mut rlp_result = RlpStream::new_list(added_headers);
rlp_result.append_raw(&data, added_headers);
Ok(Some((RECEIPTS_PACKET, rlp_result)))
}
fn return_rlp<FRlp, FError>(io: &mut SyncIo, rlp: &UntrustedRlp, peer: PeerId, rlp_func: FRlp, error_func: FError) -> Result<(), PacketDecodeError>
where FRlp : Fn(&SyncIo, &UntrustedRlp, PeerId) -> RlpResponseResult,
FError : FnOnce(UtilError) -> String
{
let response = rlp_func(io, rlp, peer);
match response {
Err(e) => Err(e),
Ok(Some((packet_id, rlp_stream))) => {
io.respond(packet_id, rlp_stream.out()).unwrap_or_else(
|e| debug!(target: "sync", "{:?}", error_func(e)));
Ok(())
}
_ => Ok(())
}
}
/// Dispatch incoming requests and responses
pub fn dispatch_packet(sync: &RwLock<ChainSync>, io: &mut SyncIo, peer: PeerId, packet_id: u8, data: &[u8]) {
let rlp = UntrustedRlp::new(data);
let result = match packet_id {
GET_BLOCK_BODIES_PACKET => ChainSync::return_rlp(io, &rlp, peer,
ChainSync::return_block_bodies,
|e| format!("Error sending block bodies: {:?}", e)),
GET_BLOCK_HEADERS_PACKET => ChainSync::return_rlp(io, &rlp, peer,
ChainSync::return_block_headers,
|e| format!("Error sending block headers: {:?}", e)),
GET_RECEIPTS_PACKET => ChainSync::return_rlp(io, &rlp, peer,
ChainSync::return_receipts,
|e| format!("Error sending receipts: {:?}", e)),
GET_NODE_DATA_PACKET => ChainSync::return_rlp(io, &rlp, peer,
ChainSync::return_node_data,
|e| format!("Error sending nodes: {:?}", e)),
_ => {
sync.write().unwrap().on_packet(io, peer, packet_id, data);
Ok(())
}
};
result.unwrap_or_else(|e| {
debug!(target:"sync", "{} -> Malformed packet {} : {}", peer, packet_id, e);
})
}
pub fn on_packet(&mut self, io: &mut SyncIo, peer: PeerId, packet_id: u8, data: &[u8]) {
if packet_id != STATUS_PACKET && !self.peers.contains_key(&peer) {
debug!(target:"sync", "Unexpected packet from unregistered peer: {}:{}", peer, io.peer_info(peer));
return;
}
let rlp = UntrustedRlp::new(data);
let result = match packet_id {
STATUS_PACKET => self.on_peer_status(io, peer, &rlp),
TRANSACTIONS_PACKET => self.on_peer_transactions(io, peer, &rlp),
BLOCK_HEADERS_PACKET => self.on_peer_block_headers(io, peer, &rlp),
BLOCK_BODIES_PACKET => self.on_peer_block_bodies(io, peer, &rlp),
NEW_BLOCK_PACKET => self.on_peer_new_block(io, peer, &rlp),
NEW_BLOCK_HASHES_PACKET => self.on_peer_new_hashes(io, peer, &rlp),
_ => {
debug!(target: "sync", "Unknown packet {}", packet_id);
Ok(())
}
};
result.unwrap_or_else(|e| {
debug!(target:"sync", "{} -> Malformed packet {} : {}", peer, packet_id, e);
})
}
pub fn maintain_peers(&mut self, io: &mut SyncIo) {
let tick = time::precise_time_s();
let mut aborting = Vec::new();
for (peer_id, peer) in &self.peers {
if peer.asking != PeerAsking::Nothing && (tick - peer.ask_time) > CONNECTION_TIMEOUT_SEC {
trace!(target:"sync", "Timeout {}", peer_id);
io.disconnect_peer(*peer_id);
aborting.push(*peer_id);
}
}
for p in aborting {
self.on_peer_aborting(io, p);
}
}
fn check_resume(&mut self, io: &mut SyncIo) {
if !io.chain().queue_info().is_full() && self.state == SyncState::Waiting {
self.state = SyncState::Blocks;
self.continue_sync(io);
}
}
/// creates rlp to send for the tree defined by 'from' and 'to' hashes
fn create_new_hashes_rlp(chain: &BlockChainClient, from: &H256, to: &H256) -> Option<Bytes> {
match chain.tree_route(from, to) {
Some(route) => {
let uncles = chain.find_uncles(from).unwrap_or_else(Vec::new);
match route.blocks.len() {
0 => None,
_ => {
let mut blocks = route.blocks;
blocks.extend(uncles);
let mut rlp_stream = RlpStream::new_list(blocks.len());
for block_hash in blocks {
let mut hash_rlp = RlpStream::new_list(2);
let number = HeaderView::new(&chain.block_header(BlockID::Hash(block_hash.clone()))
.expect("chain.tree_route and chain.find_uncles only return hahses of blocks that are in the blockchain. qed.")).number();
hash_rlp.append(&block_hash);
hash_rlp.append(&number);
rlp_stream.append_raw(hash_rlp.as_raw(), 1);
}
Some(rlp_stream.out())
}
}
},
None => None
}
}
/// creates latest block rlp for the given client
fn create_latest_block_rlp(chain: &BlockChainClient) -> Bytes {
let mut rlp_stream = RlpStream::new_list(2);
rlp_stream.append_raw(&chain.block(BlockID::Hash(chain.chain_info().best_block_hash)).unwrap(), 1);
rlp_stream.append(&chain.chain_info().total_difficulty);
rlp_stream.out()
}
/// returns peer ids that have less blocks than our chain
fn get_lagging_peers(&mut self, chain_info: &BlockChainInfo, io: &SyncIo) -> Vec<(PeerId, BlockNumber)> {
let latest_hash = chain_info.best_block_hash;
let latest_number = chain_info.best_block_number;
self.peers.iter_mut().filter_map(|(&id, ref mut peer_info)|
match io.chain().block_status(BlockID::Hash(peer_info.latest_hash.clone())) {
BlockStatus::InChain => {
if peer_info.latest_number.is_none() {
peer_info.latest_number = Some(HeaderView::new(&io.chain().block_header(BlockID::Hash(peer_info.latest_hash.clone())).unwrap()).number());
}
if peer_info.latest_hash != latest_hash && latest_number > peer_info.latest_number.unwrap() {
Some((id, peer_info.latest_number.unwrap()))
} else { None }
},
_ => None
})
.collect::<Vec<_>>()
}
fn select_lagging_peers(&mut self, chain_info: &BlockChainInfo, io: &mut SyncIo) -> Vec<(PeerId, BlockNumber)> {
use rand::Rng;
let mut lagging_peers = self.get_lagging_peers(chain_info, io);
// take sqrt(x) peers
let mut count = (self.peers.len() as f64).powf(0.5).round() as usize;
count = min(count, MAX_PEERS_PROPAGATION);
count = max(count, MIN_PEERS_PROPAGATION);
::rand::thread_rng().shuffle(&mut lagging_peers);
lagging_peers.into_iter().take(count).collect::<Vec<_>>()
}
/// propagates latest block to lagging peers
fn propagate_blocks(&mut self, chain_info: &BlockChainInfo, io: &mut SyncIo) -> usize {
let lucky_peers = self.select_lagging_peers(chain_info, io);
trace!(target: "sync", "Sending NewBlocks to {:?}", lucky_peers);
let mut sent = 0;
for (peer_id, _) in lucky_peers {
let rlp = ChainSync::create_latest_block_rlp(io.chain());
self.send_packet(io, peer_id, NEW_BLOCK_PACKET, rlp);
self.peers.get_mut(&peer_id).unwrap().latest_hash = chain_info.best_block_hash.clone();
self.peers.get_mut(&peer_id).unwrap().latest_number = Some(chain_info.best_block_number);
sent += 1;
}
sent
}
/// propagates new known hashes to all peers
fn propagate_new_hashes(&mut self, chain_info: &BlockChainInfo, io: &mut SyncIo) -> usize {
let lucky_peers = self.select_lagging_peers(chain_info, io);
trace!(target: "sync", "Sending NewHashes to {:?}", lucky_peers);
let mut sent = 0;
let last_parent = HeaderView::new(&io.chain().block_header(BlockID::Hash(chain_info.best_block_hash.clone())).unwrap()).parent_hash();
for (peer_id, peer_number) in lucky_peers {
let peer_best = if chain_info.best_block_number - peer_number > MAX_PEER_LAG_PROPAGATION as BlockNumber {
// If we think peer is too far behind just send one latest hash
last_parent.clone()
} else {
self.peers.get(&peer_id).unwrap().latest_hash.clone()
};
sent += match ChainSync::create_new_hashes_rlp(io.chain(), &peer_best, &chain_info.best_block_hash) {
Some(rlp) => {
{
let peer = self.peers.get_mut(&peer_id).unwrap();
peer.latest_hash = chain_info.best_block_hash.clone();
peer.latest_number = Some(chain_info.best_block_number);
}
self.send_packet(io, peer_id, NEW_BLOCK_HASHES_PACKET, rlp);
1
},
None => 0
}
}
sent
}
/// propagates new transactions to all peers
fn propagate_new_transactions(&mut self, io: &mut SyncIo) -> usize {
// Early out of nobody to send to.
if self.peers.is_empty() {
return 0;
}
let mut transactions = io.chain().all_transactions();
if transactions.is_empty() {
return 0;
}
let mut packet = RlpStream::new_list(transactions.len());
let tx_count = transactions.len();
for tx in transactions.drain(..) {
packet.append(&tx);
}
let rlp = packet.out();
let lucky_peers = {
// sqrt(x)/x scaled to max u32
let fraction = (self.peers.len() as f64).powf(-0.5).mul(u32::max_value() as f64).round() as u32;
let small = self.peers.len() < MIN_PEERS_PROPAGATION;
let lucky_peers = self.peers.iter()
.filter_map(|(&p, _)| if small || ::rand::random::<u32>() < fraction { Some(p.clone()) } else { None })
.collect::<Vec<_>>();
// taking at max of MAX_PEERS_PROPAGATION
lucky_peers.iter().cloned().take(min(lucky_peers.len(), MAX_PEERS_PROPAGATION)).collect::<Vec<PeerId>>()
};
let sent = lucky_peers.len();
for peer_id in lucky_peers {
self.send_packet(io, peer_id, TRANSACTIONS_PACKET, rlp.clone());
}
trace!(target: "sync", "Sent {} transactions to {} peers.", tx_count, sent);
sent
}
fn propagate_latest_blocks(&mut self, io: &mut SyncIo) {
let chain_info = io.chain().chain_info();
if (((chain_info.best_block_number as i64) - (self.last_sent_block_number as i64)).abs() as BlockNumber) < MAX_PEER_LAG_PROPAGATION {
let hashes = self.propagate_new_hashes(&chain_info, io);
let blocks = self.propagate_blocks(&chain_info, io);
if blocks != 0 || hashes != 0 {
trace!(target: "sync", "Sent latest {} blocks and {} hashes to peers.", blocks, hashes);
}
}
self.propagate_new_transactions(io);
self.last_sent_block_number = chain_info.best_block_number;
}
/// Maintain other peers. Send out any new blocks and transactions
pub fn maintain_sync(&mut self, io: &mut SyncIo) {
self.check_resume(io);
}
/// called when block is imported to chain, updates transactions queue and propagates the blocks
pub fn chain_new_blocks(&mut self, io: &mut SyncIo, _imported: &[H256], invalid: &[H256], _enacted: &[H256], _retracted: &[H256]) {
if io.is_chain_queue_empty() {
// Propagate latests blocks
self.propagate_latest_blocks(io);
}
if !invalid.is_empty() {
trace!(target: "sync", "Bad blocks in the queue, restarting");
self.restart_on_bad_block(io);
}
}
}
#[cfg(test)]
mod tests {
use tests::helpers::*;
use super::*;
use ::SyncConfig;
use util::*;
use super::{PeerInfo, PeerAsking};
use ethcore::views::BlockView;
use ethcore::header::*;
use ethcore::client::*;
use ethcore::miner::MinerService;
fn get_dummy_block(order: u32, parent_hash: H256) -> Bytes {
let mut header = Header::new();
header.gas_limit = 0.into();
header.difficulty = (order * 100).into();
header.timestamp = (order * 10) as u64;
header.number = order as u64;
header.parent_hash = parent_hash;
header.state_root = H256::zero();
let mut rlp = RlpStream::new_list(3);
rlp.append(&header);
rlp.append_raw(&rlp::EMPTY_LIST_RLP, 1);
rlp.append_raw(&rlp::EMPTY_LIST_RLP, 1);
rlp.out()
}
fn get_dummy_blocks(order: u32, parent_hash: H256) -> Bytes {
let mut rlp = RlpStream::new_list(1);
rlp.append_raw(&get_dummy_block(order, parent_hash), 1);
let difficulty: U256 = (100 * order).into();
rlp.append(&difficulty);
rlp.out()
}
fn get_dummy_hashes() -> Bytes {
let mut rlp = RlpStream::new_list(5);
for _ in 0..5 {
let mut hash_d_rlp = RlpStream::new_list(2);
let hash: H256 = H256::from(0u64);
let diff: U256 = U256::from(1u64);
hash_d_rlp.append(&hash);
hash_d_rlp.append(&diff);
rlp.append_raw(&hash_d_rlp.out(), 1);
}
rlp.out()
}
#[test]
fn return_receipts_empty() {
let mut client = TestBlockChainClient::new();
let mut queue = VecDeque::new();
let io = TestIo::new(&mut client, &mut queue, None);
let result = ChainSync::return_receipts(&io, &UntrustedRlp::new(&[0xc0]), 0);
assert!(result.is_ok());
}
#[test]
fn return_receipts() {
let mut client = TestBlockChainClient::new();
let mut queue = VecDeque::new();
let sync = dummy_sync_with_peer(H256::new(), &client);
let mut io = TestIo::new(&mut client, &mut queue, None);
let mut receipt_list = RlpStream::new_list(4);
receipt_list.append(&H256::from("0000000000000000000000000000000000000000000000005555555555555555"));
receipt_list.append(&H256::from("ff00000000000000000000000000000000000000000000000000000000000000"));
receipt_list.append(&H256::from("fff0000000000000000000000000000000000000000000000000000000000000"));
receipt_list.append(&H256::from("aff0000000000000000000000000000000000000000000000000000000000000"));
let receipts_request = receipt_list.out();
// it returns rlp ONLY for hashes started with "f"
let result = ChainSync::return_receipts(&io, &UntrustedRlp::new(&receipts_request.clone()), 0);
assert!(result.is_ok());
let rlp_result = result.unwrap();
assert!(rlp_result.is_some());
// the length of two rlp-encoded receipts
assert_eq!(603, rlp_result.unwrap().1.out().len());
io.sender = Some(2usize);
ChainSync::dispatch_packet(&RwLock::new(sync), &mut io, 0usize, super::GET_RECEIPTS_PACKET, &receipts_request);
assert_eq!(1, io.queue.len());
}
#[test]
fn return_block_headers() {
use ethcore::views::HeaderView;
fn make_hash_req(h: &H256, count: usize, skip: usize, reverse: bool) -> Bytes {
let mut rlp = RlpStream::new_list(4);
rlp.append(h);
rlp.append(&count);
rlp.append(&skip);
rlp.append(&if reverse {1u32} else {0u32});
rlp.out()
}
fn make_num_req(n: usize, count: usize, skip: usize, reverse: bool) -> Bytes {
let mut rlp = RlpStream::new_list(4);
rlp.append(&n);
rlp.append(&count);
rlp.append(&skip);
rlp.append(&if reverse {1u32} else {0u32});
rlp.out()
}
fn to_header_vec(rlp: ::chain::RlpResponseResult) -> Vec<Bytes> {
Rlp::new(&rlp.unwrap().unwrap().1.out()).iter().map(|r| r.as_raw().to_vec()).collect()
}
let mut client = TestBlockChainClient::new();
client.add_blocks(100, EachBlockWith::Nothing);
let blocks: Vec<_> = (0 .. 100).map(|i| (&client as &BlockChainClient).block(BlockID::Number(i as BlockNumber)).unwrap()).collect();
let headers: Vec<_> = blocks.iter().map(|b| Rlp::new(b).at(0).as_raw().to_vec()).collect();
let hashes: Vec<_> = headers.iter().map(|h| HeaderView::new(h).sha3()).collect();
let mut queue = VecDeque::new();
let io = TestIo::new(&mut client, &mut queue, None);
let unknown: H256 = H256::new();
let result = ChainSync::return_block_headers(&io, &UntrustedRlp::new(&make_hash_req(&unknown, 1, 0, false)), 0);
assert!(to_header_vec(result).is_empty());
let result = ChainSync::return_block_headers(&io, &UntrustedRlp::new(&make_hash_req(&unknown, 1, 0, true)), 0);
assert!(to_header_vec(result).is_empty());
let result = ChainSync::return_block_headers(&io, &UntrustedRlp::new(&make_hash_req(&hashes[2], 1, 0, true)), 0);
assert_eq!(to_header_vec(result), vec![headers[2].clone()]);
let result = ChainSync::return_block_headers(&io, &UntrustedRlp::new(&make_hash_req(&hashes[2], 1, 0, false)), 0);
assert_eq!(to_header_vec(result), vec![headers[2].clone()]);
let result = ChainSync::return_block_headers(&io, &UntrustedRlp::new(&make_hash_req(&hashes[50], 3, 5, false)), 0);
assert_eq!(to_header_vec(result), vec![headers[50].clone(), headers[56].clone(), headers[62].clone()]);
let result = ChainSync::return_block_headers(&io, &UntrustedRlp::new(&make_hash_req(&hashes[50], 3, 5, true)), 0);
assert_eq!(to_header_vec(result), vec![headers[50].clone(), headers[44].clone(), headers[38].clone()]);
let result = ChainSync::return_block_headers(&io, &UntrustedRlp::new(&make_num_req(2, 1, 0, true)), 0);
assert_eq!(to_header_vec(result), vec![headers[2].clone()]);
let result = ChainSync::return_block_headers(&io, &UntrustedRlp::new(&make_num_req(2, 1, 0, false)), 0);
assert_eq!(to_header_vec(result), vec![headers[2].clone()]);
let result = ChainSync::return_block_headers(&io, &UntrustedRlp::new(&make_num_req(50, 3, 5, false)), 0);
assert_eq!(to_header_vec(result), vec![headers[50].clone(), headers[56].clone(), headers[62].clone()]);
let result = ChainSync::return_block_headers(&io, &UntrustedRlp::new(&make_num_req(50, 3, 5, true)), 0);
assert_eq!(to_header_vec(result), vec![headers[50].clone(), headers[44].clone(), headers[38].clone()]);
}
#[test]
fn return_nodes() {
let mut client = TestBlockChainClient::new();
let mut queue = VecDeque::new();
let sync = dummy_sync_with_peer(H256::new(), &client);
let mut io = TestIo::new(&mut client, &mut queue, None);
let mut node_list = RlpStream::new_list(3);
node_list.append(&H256::from("0000000000000000000000000000000000000000000000005555555555555555"));
node_list.append(&H256::from("ffffffffffffffffffffffffffffffffffffffffffffaaaaaaaaaaaaaaaaaaaa"));
node_list.append(&H256::from("aff0000000000000000000000000000000000000000000000000000000000000"));
let node_request = node_list.out();
// it returns rlp ONLY for hashes started with "f"
let result = ChainSync::return_node_data(&io, &UntrustedRlp::new(&node_request.clone()), 0);
assert!(result.is_ok());
let rlp_result = result.unwrap();
assert!(rlp_result.is_some());
// the length of one rlp-encoded hashe
assert_eq!(34, rlp_result.unwrap().1.out().len());
io.sender = Some(2usize);
ChainSync::dispatch_packet(&RwLock::new(sync), &mut io, 0usize, super::GET_NODE_DATA_PACKET, &node_request);
assert_eq!(1, io.queue.len());
}
fn dummy_sync_with_peer(peer_latest_hash: H256, client: &BlockChainClient) -> ChainSync {
let mut sync = ChainSync::new(SyncConfig::default(), client);
sync.peers.insert(0,
PeerInfo {
protocol_version: 0,
genesis: H256::zero(),
network_id: U256::zero(),
latest_hash: peer_latest_hash,
latest_number: None,
difficulty: None,
asking: PeerAsking::Nothing,
asking_blocks: Vec::new(),
asking_hash: None,
ask_time: 0f64,
});
sync
}
#[test]
fn finds_lagging_peers() {
let mut client = TestBlockChainClient::new();
client.add_blocks(100, EachBlockWith::Uncle);
let mut queue = VecDeque::new();
let mut sync = dummy_sync_with_peer(client.block_hash_delta_minus(10), &client);
let chain_info = client.chain_info();
let io = TestIo::new(&mut client, &mut queue, None);
let lagging_peers = sync.get_lagging_peers(&chain_info, &io);
assert_eq!(1, lagging_peers.len())
}
#[test]
fn calculates_tree_for_lagging_peer() {
let mut client = TestBlockChainClient::new();
client.add_blocks(15, EachBlockWith::Uncle);
let start = client.block_hash_delta_minus(4);
let end = client.block_hash_delta_minus(2);
// wrong way end -> start, should be None
let rlp = ChainSync::create_new_hashes_rlp(&client, &end, &start);
assert!(rlp.is_none());
let rlp = ChainSync::create_new_hashes_rlp(&client, &start, &end).unwrap();
// size of three rlp encoded hash-difficulty
assert_eq!(107, rlp.len());
}
#[test]
fn sends_new_hashes_to_lagging_peer() {
let mut client = TestBlockChainClient::new();
client.add_blocks(100, EachBlockWith::Uncle);
let mut queue = VecDeque::new();
let mut sync = dummy_sync_with_peer(client.block_hash_delta_minus(5), &client);
let chain_info = client.chain_info();
let mut io = TestIo::new(&mut client, &mut queue, None);
let peer_count = sync.propagate_new_hashes(&chain_info, &mut io);
// 1 message should be send
assert_eq!(1, io.queue.len());
// 1 peer should be updated
assert_eq!(1, peer_count);
// NEW_BLOCK_HASHES_PACKET
assert_eq!(0x01, io.queue[0].packet_id);
}
#[test]
fn sends_latest_block_to_lagging_peer() {
let mut client = TestBlockChainClient::new();
client.add_blocks(100, EachBlockWith::Uncle);
let mut queue = VecDeque::new();
let mut sync = dummy_sync_with_peer(client.block_hash_delta_minus(5), &client);
let chain_info = client.chain_info();
let mut io = TestIo::new(&mut client, &mut queue, None);
let peer_count = sync.propagate_blocks(&chain_info, &mut io);
// 1 message should be send
assert_eq!(1, io.queue.len());
// 1 peer should be updated
assert_eq!(1, peer_count);
// NEW_BLOCK_PACKET
assert_eq!(0x07, io.queue[0].packet_id);
}
#[test]
fn handles_peer_new_block_malformed() {
let mut client = TestBlockChainClient::new();
client.add_blocks(10, EachBlockWith::Uncle);
let block_data = get_dummy_block(11, client.chain_info().best_block_hash);
let mut queue = VecDeque::new();
let mut sync = dummy_sync_with_peer(client.block_hash_delta_minus(5), &client);
//sync.have_common_block = true;
let mut io = TestIo::new(&mut client, &mut queue, None);
let block = UntrustedRlp::new(&block_data);
let result = sync.on_peer_new_block(&mut io, 0, &block);
assert!(result.is_err());
}
#[test]
fn handles_peer_new_block() {
let mut client = TestBlockChainClient::new();
client.add_blocks(10, EachBlockWith::Uncle);
let block_data = get_dummy_blocks(11, client.chain_info().best_block_hash);
let mut queue = VecDeque::new();
let mut sync = dummy_sync_with_peer(client.block_hash_delta_minus(5), &client);
let mut io = TestIo::new(&mut client, &mut queue, None);
let block = UntrustedRlp::new(&block_data);
let result = sync.on_peer_new_block(&mut io, 0, &block);
assert!(result.is_ok());
}
#[test]
fn handles_peer_new_block_empty() {
let mut client = TestBlockChainClient::new();
client.add_blocks(10, EachBlockWith::Uncle);
let mut queue = VecDeque::new();
let mut sync = dummy_sync_with_peer(client.block_hash_delta_minus(5), &client);
let mut io = TestIo::new(&mut client, &mut queue, None);
let empty_data = vec![];
let block = UntrustedRlp::new(&empty_data);
let result = sync.on_peer_new_block(&mut io, 0, &block);
assert!(result.is_err());
}
#[test]
fn handles_peer_new_hashes() {
let mut client = TestBlockChainClient::new();
client.add_blocks(10, EachBlockWith::Uncle);
let mut queue = VecDeque::new();
let mut sync = dummy_sync_with_peer(client.block_hash_delta_minus(5), &client);
let mut io = TestIo::new(&mut client, &mut queue, None);
let hashes_data = get_dummy_hashes();
let hashes_rlp = UntrustedRlp::new(&hashes_data);
let result = sync.on_peer_new_hashes(&mut io, 0, &hashes_rlp);
assert!(result.is_ok());
}
#[test]
fn handles_peer_new_hashes_empty() {
let mut client = TestBlockChainClient::new();
client.add_blocks(10, EachBlockWith::Uncle);
let mut queue = VecDeque::new();
let mut sync = dummy_sync_with_peer(client.block_hash_delta_minus(5), &client);
let mut io = TestIo::new(&mut client, &mut queue, None);
let empty_hashes_data = vec![];
let hashes_rlp = UntrustedRlp::new(&empty_hashes_data);
let result = sync.on_peer_new_hashes(&mut io, 0, &hashes_rlp);
assert!(result.is_ok());
}
// idea is that what we produce when propagading latest hashes should be accepted in
// on_peer_new_hashes in our code as well
#[test]
fn hashes_rlp_mutually_acceptable() {
let mut client = TestBlockChainClient::new();
client.add_blocks(100, EachBlockWith::Uncle);
let mut queue = VecDeque::new();
let mut sync = dummy_sync_with_peer(client.block_hash_delta_minus(5), &client);
let chain_info = client.chain_info();
let mut io = TestIo::new(&mut client, &mut queue, None);
sync.propagate_new_hashes(&chain_info, &mut io);
let data = &io.queue[0].data.clone();
let result = sync.on_peer_new_hashes(&mut io, 0, &UntrustedRlp::new(data));
assert!(result.is_ok());
}
// idea is that what we produce when propagading latest block should be accepted in
// on_peer_new_block in our code as well
#[test]
fn block_rlp_mutually_acceptable() {
let mut client = TestBlockChainClient::new();
client.add_blocks(100, EachBlockWith::Uncle);
let mut queue = VecDeque::new();
let mut sync = dummy_sync_with_peer(client.block_hash_delta_minus(5), &client);
let chain_info = client.chain_info();
let mut io = TestIo::new(&mut client, &mut queue, None);
sync.propagate_blocks(&chain_info, &mut io);
let data = &io.queue[0].data.clone();
let result = sync.on_peer_new_block(&mut io, 0, &UntrustedRlp::new(data));
assert!(result.is_ok());
}
#[test]
fn should_add_transactions_to_queue() {
// given
let mut client = TestBlockChainClient::new();
client.add_blocks(98, EachBlockWith::Uncle);
client.add_blocks(1, EachBlockWith::UncleAndTransaction);
client.add_blocks(1, EachBlockWith::Transaction);
let mut sync = dummy_sync_with_peer(client.block_hash_delta_minus(5), &client);
let good_blocks = vec![client.block_hash_delta_minus(2)];
let retracted_blocks = vec![client.block_hash_delta_minus(1)];
// Add some balance to clients and reset nonces
for h in &[good_blocks[0], retracted_blocks[0]] {
let block = client.block(BlockID::Hash(*h)).unwrap();
let view = BlockView::new(&block);
client.set_balance(view.transactions()[0].sender().unwrap(), U256::from(1_000_000_000));
client.set_nonce(view.transactions()[0].sender().unwrap(), U256::from(0));
}
// when
{
let mut queue = VecDeque::new();
let mut io = TestIo::new(&mut client, &mut queue, None);
io.chain.miner.chain_new_blocks(io.chain, &[], &[], &[], &good_blocks);
sync.chain_new_blocks(&mut io, &[], &[], &[], &good_blocks);
assert_eq!(io.chain.miner.status().transactions_in_future_queue, 0);
assert_eq!(io.chain.miner.status().transactions_in_pending_queue, 1);
}
// We need to update nonce status (because we say that the block has been imported)
for h in &[good_blocks[0]] {
let block = client.block(BlockID::Hash(*h)).unwrap();
let view = BlockView::new(&block);
client.set_nonce(view.transactions()[0].sender().unwrap(), U256::from(1));
}
{
let mut queue = VecDeque::new();
let mut io = TestIo::new(&mut client, &mut queue, None);
io.chain.miner.chain_new_blocks(io.chain, &[], &[], &good_blocks, &retracted_blocks);
sync.chain_new_blocks(&mut io, &[], &[], &good_blocks, &retracted_blocks);
}
// then
let status = client.miner.status();
assert_eq!(status.transactions_in_pending_queue, 1);
assert_eq!(status.transactions_in_future_queue, 0);
}
#[test]
fn should_not_add_transactions_to_queue_if_not_synced() {
// given
let mut client = TestBlockChainClient::new();
client.add_blocks(98, EachBlockWith::Uncle);
client.add_blocks(1, EachBlockWith::UncleAndTransaction);
client.add_blocks(1, EachBlockWith::Transaction);
let mut sync = dummy_sync_with_peer(client.block_hash_delta_minus(5), &client);
let good_blocks = vec![client.block_hash_delta_minus(2)];
let retracted_blocks = vec![client.block_hash_delta_minus(1)];
let mut queue = VecDeque::new();
let mut io = TestIo::new(&mut client, &mut queue, None);
// when
sync.chain_new_blocks(&mut io, &[], &[], &[], &good_blocks);
assert_eq!(io.chain.miner.status().transactions_in_future_queue, 0);
assert_eq!(io.chain.miner.status().transactions_in_pending_queue, 0);
sync.chain_new_blocks(&mut io, &[], &[], &good_blocks, &retracted_blocks);
// then
let status = io.chain.miner.status();
assert_eq!(status.transactions_in_pending_queue, 0);
assert_eq!(status.transactions_in_future_queue, 0);
}
}