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sync refactoring; range tests

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This commit is contained in:
arkpar 2015-12-25 14:55:55 +01:00
parent a367ffca2b
commit 9087cc798b
8 changed files with 543 additions and 238 deletions
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3
.gitignore vendored
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@ -17,3 +17,6 @@ Cargo.lock
# mac stuff
.DS_Store
# gdb files
.gdb_history

2
src/bin/client.rs
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@ -5,7 +5,7 @@ use util::network::{NetworkService};
fn main() {
let mut service = NetworkService::start().unwrap();
let _service = NetworkService::start().unwrap();
loop {
let mut cmd = String::new();
stdin().read_line(&mut cmd).unwrap();

9
src/eth.rs
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@ -31,7 +31,10 @@ pub struct BlockChainInfo {
pub last_block_number: BlockNumber
}
pub struct BlockQueueStats;
pub struct BlockQueueStatus {
pub full: bool,
}
pub struct TreeRoute;
pub type BlockNumber = u32;
@ -50,7 +53,7 @@ pub trait BlockChainClient : Sync {
fn state_data(&self, h: &H256) -> Option<Bytes>;
fn block_receipts(&self, h: &H256) -> Option<Bytes>;
fn import_block(&mut self, b: &[u8]) -> ImportResult;
fn queue_stats(&self) -> BlockQueueStats;
fn clear_queue(&mut self) -> BlockQueueStats;
fn queue_status(&self) -> BlockQueueStatus;
fn clear_queue(&mut self);
fn info(&self) -> BlockChainInfo;
}

320
src/sync/chain.rs
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@ -1,6 +1,5 @@
use std::collections::{HashSet, HashMap};
use std::cmp::{min, max};
use std::ops::{Add, Sub, Range};
use std::mem::{replace};
use util::network::{PeerId, HandlerIo, PacketId};
use util::hash::{H256};
@ -10,6 +9,7 @@ use util::rlp::{Rlp, RlpStream, self}; //TODO: use UntrustedRlp
use util::rlp::rlptraits::{Stream, View};
use util::sha3::Hashable;
use eth::{BlockNumber, BlockChainClient, BlockHeader, BlockStatus, QueueStatus, ImportResult};
use sync::range_collection::{RangeCollection, ToUsize, FromUsize};
pub struct SyncIo<'s, 'h> where 'h:'s {
network: &'s mut HandlerIo<'h>,
@ -28,11 +28,25 @@ impl<'s, 'h> SyncIo<'s, 'h> {
}
}
impl ToUsize for BlockNumber {
fn to_usize(&self) -> usize {
*self as usize
}
}
impl FromUsize for BlockNumber {
fn from_usize(s: usize) -> BlockNumber {
s as BlockNumber
}
}
const PROTOCOL_VERSION: u8 = 63u8;
const MAX_BODIES_TO_SEND: usize = 256;
const MAX_HEADERS_TO_SEND: usize = 1024;
const MAX_NODE_DATA_TO_SEND: usize = 1024;
const MAX_RECEIPTS_TO_SEND: usize = 1024;
const MAX_HEADERS_TO_REQUEST: usize = 1024;
const MAX_BODIES_TO_REQUEST: usize = 256;
const STATUS_PACKET: u8 = 0x00;
const NEW_BLOCK_HASHES_PACKET: u8 = 0x01;
@ -79,13 +93,13 @@ pub enum SyncState {
}
pub struct SyncStatus {
state: SyncState,
protocol_version: u8,
start_block_number: BlockNumber,
current_block_number: BlockNumber,
highest_block_number: BlockNumber,
blocks_total: usize,
blocks_received: usize
pub state: SyncState,
pub protocol_version: u8,
pub start_block_number: BlockNumber,
pub current_block_number: BlockNumber,
pub highest_block_number: BlockNumber,
pub blocks_total: usize,
pub blocks_received: usize
}
#[derive(PartialEq, Eq, Debug)]
@ -138,8 +152,8 @@ pub struct ChainSync {
impl ChainSync {
pub fn new(io: &mut SyncIo) -> ChainSync {
let mut sync = ChainSync {
pub fn new() -> ChainSync {
ChainSync {
state: SyncState::NotSynced,
starting_block: 0,
highest_block: 0,
@ -152,9 +166,7 @@ impl ChainSync {
last_imported_block: 0,
syncing_difficulty: U256::from(0u64),
have_common_block: false
};
sync.restart(io);
sync
}
}
/// @returns Synchonization status
@ -177,8 +189,8 @@ impl ChainSync {
}
/// @returns true is Sync is in progress
pub fn is_syncing(&self) {
self.state != SyncState::Idle;
pub fn is_syncing(&self) -> bool {
self.state != SyncState::Idle
}
fn reset(&mut self) {
@ -217,6 +229,9 @@ impl ChainSync {
asking: PeerAsking::Nothing,
asking_blocks: Vec::new(),
};
trace!(target: "sync", "New peer (protocol: {}, network: {:?}, difficulty: {:?}, latest:{}, genesis:{})", peer.protocol_version, peer.network_id, peer.difficulty, peer.latest, peer.genesis);
let old = self.peers.insert(peer_id.clone(), peer);
if old.is_some() {
panic!("ChainSync: new peer already exists");
@ -423,6 +438,7 @@ impl ChainSync {
/// Enter waiting state
fn pause_sync(&mut self) {
trace!(target: "sync", "Block queue full, pausing sync");
self.state = SyncState::Waiting;
}
@ -431,12 +447,12 @@ impl ChainSync {
let peer = self.peers.get_mut(&peer_id).expect("ChainSync: unknown peer");
if peer.asking != PeerAsking::Nothing
{
debug!(target: "sync", "Can't sync with this peer - outstanding asks.");
trace!(target: "sync", "Can't sync with this peer - outstanding asks.");
return;
}
if self.state == SyncState::Waiting
{
debug!(target: "sync", "Waiting for block queue");
trace!(target: "sync", "Waiting for block queue");
return;
}
(peer.latest.clone(), peer.difficulty.clone())
@ -459,24 +475,30 @@ impl ChainSync {
fn request_blocks(&mut self, io: &mut SyncIo, peer_id: &PeerId) {
self.clear_peer_download(peer_id);
if io.chain.queue_status().full {
self.pause_sync();
return;
}
// check to see if we need to download any block bodies first
let mut needed_bodies: Vec<H256> = Vec::new();
let mut needed_numbers: Vec<BlockNumber> = Vec::new();
let mut index = 0usize;
if self.have_common_block && !self.headers.is_empty() && self.headers.last().unwrap().0 == self.last_imported_block + 1 {
let mut header = self.headers.len() - 1;
while header != 0 && needed_bodies.len() < 1024 && index < self.headers[header].1.len() {
let block = self.headers[header].0 + index as BlockNumber;
if self.have_common_block && !self.headers.is_empty() && self.headers.range_iter().next().unwrap().0 == self.last_imported_block + 1 {
for (start, ref items) in self.headers.range_iter() {
if needed_bodies.len() >= MAX_BODIES_TO_REQUEST {
break;
}
let mut index: BlockNumber = 0;
while index != items.len() as BlockNumber && needed_bodies.len() < MAX_BODIES_TO_REQUEST {
let block = start + index;
if !self.downloading_bodies.contains(&block) && !self.bodies.have_item(&block) {
needed_bodies.push(self.headers[header].1[index].hash.clone());
needed_bodies.push(items[index as usize].hash.clone());
needed_numbers.push(block);
self.downloading_bodies.insert(block);
}
index += 1;
if index >= self.headers[header].1.len() {
index = 0;
header -= 1;
}
}
}
@ -491,44 +513,43 @@ impl ChainSync {
// download backwards until common block is found 1 header at a time
start = io.chain.info().last_block_number as usize;
if !self.headers.is_empty() {
start = min(start, self.headers.last().unwrap().0 as usize - 1);
start = min(start, self.headers.range_iter().next().unwrap().0 as usize - 1);
}
if start <= 1 {
self.have_common_block = true; //reached genesis
}
}
if self.have_common_block {
start = self.last_imported_block as usize + 1;
let mut next = self.headers.len() - 1;
let mut count = 0usize;
if !self.headers.is_empty() && start >= self.headers.last().unwrap().0 as usize {
start = self.headers.last().unwrap().0 as usize + self.headers.last().unwrap().1.len();
next -=1;
}
while count == 0 && next != 0 {
count = min(1024, self.headers[next].0 as usize - start);
while count > 0 && self.downloading_headers.contains(&(start as BlockNumber)) {
start +=1;
count -=1;
}
}
let mut headers: Vec<BlockNumber> = Vec::new();
for block in start..(start + count) {
let mut prev = self.last_imported_block + 1;
for (start, ref items) in self.headers.range_iter() {
if headers.len() >= MAX_HEADERS_TO_REQUEST {
break;
}
if start > prev {
continue;
}
let mut index = 0;
while index != items.len() as BlockNumber && headers.len() < MAX_BODIES_TO_REQUEST {
let block = prev + index;
if !self.downloading_headers.contains(&(block as BlockNumber)) {
headers.push(block as BlockNumber);
self.downloading_headers.insert(block as BlockNumber);
}
index += 1;
}
count = self.headers.len();
if count > 0 {
prev = start + items.len() as BlockNumber;
}
if !headers.is_empty() {
let count = headers.len();
replace(&mut self.peers.get_mut(peer_id).unwrap().asking_blocks, headers);
assert!(!self.headers.have_item(&(start as BlockNumber)));
self.request_headers_by_number(io, peer_id, start as BlockNumber, count, 0, false);
}
else if start >= (self.headers[next].0 as usize) {
start = self.headers[next].0 as usize + self.headers[next].1.len();
next -=1;
}
}
else {
self.request_headers_by_number(io, peer_id, start as BlockNumber, 1, 0, false);
@ -553,8 +574,8 @@ impl ChainSync {
let mut restart = false;
// merge headers and bodies
{
let mut headers = self.headers.last().unwrap();
let mut bodies = self.bodies.last().unwrap();
let headers = self.headers.range_iter().next().unwrap();
let bodies = self.bodies.range_iter().next().unwrap();
if headers.0 != bodies.0 || headers.0 != self.last_imported_block + 1 {
return;
}
@ -593,8 +614,8 @@ impl ChainSync {
return;
}
self.headers.remove_head(&self.last_imported_block);
self.bodies.remove_head(&self.last_imported_block);
self.headers.remove_head(&(self.last_imported_block + 1));
self.bodies.remove_head(&(self.last_imported_block + 1));
if self.headers.is_empty() {
assert!(self.bodies.is_empty());
@ -645,12 +666,12 @@ impl ChainSync {
for h in hashes {
rlp.append(&h);
}
self.send_request(sync, peer_id, PeerAsking::BlockHeaders, GET_BLOCK_BODIES_PACKET, rlp.out());
self.send_request(sync, peer_id, PeerAsking::BlockBodies, GET_BLOCK_BODIES_PACKET, rlp.out());
}
fn send_request(&mut self, sync: &mut SyncIo, peer_id: &PeerId, asking: PeerAsking, packet_id: PacketId, packet: Bytes) {
{
let mut peer = self.peers.get_mut(&peer_id).expect("ChainSync: unknown peer");
let peer = self.peers.get_mut(&peer_id).expect("ChainSync: unknown peer");
if peer.asking != PeerAsking::Nothing {
warn!(target:"sync", "Asking {:?} while requesting {:?}", asking, peer.asking);
}
@ -668,7 +689,7 @@ impl ChainSync {
}
}
fn on_peer_transactions(&mut self, io: &mut SyncIo, peer_id: &PeerId, r: &Rlp) {
fn on_peer_transactions(&mut self, _io: &mut SyncIo, _peer_id: &PeerId, _r: &Rlp) {
}
fn send_status(&mut self, io: &mut SyncIo, peer_id: &PeerId) {
@ -682,13 +703,12 @@ impl ChainSync {
self.send_request(io, peer_id, PeerAsking::State, STATUS_PACKET, packet.out());
}
fn return_block_headers(&self, io: &mut SyncIo, peer_id: &PeerId, r: &Rlp) {
fn return_block_headers(&self, io: &mut SyncIo, r: &Rlp) {
// Packet layout:
// [ block: { P , B_32 }, maxHeaders: P, skip: P, reverse: P in { 0 , 1 } ]
let max_headers: usize = r.val_at(1);
let skip: usize = r.val_at(2);
let reverse: bool = r.val_at(3);
let mut packet = RlpStream::new();
let last = io.chain.info().last_block_number;
let mut number = if r.at(0).size() == 32 {
// id is a hash
@ -716,14 +736,20 @@ impl ChainSync {
}
None => {}
}
number += (if reverse { -(skip + 1) } else { skip + 1 }) as BlockNumber;
if reverse {
number -= (skip + 1) as BlockNumber;
}
else {
number += (skip + 1) as BlockNumber;
}
}
let mut rlp = RlpStream::new_list(count as usize);
rlp.append_raw(&data, count as usize);
io.network.respond(BLOCK_HEADERS_PACKET, rlp.out());
io.network.respond(BLOCK_HEADERS_PACKET, rlp.out()).unwrap_or_else(|e|
debug!(target: "sync", "Error sending headers: {:?}", e));
}
fn return_block_bodies(&self, io: &mut SyncIo, peer_id: &PeerId, r: &Rlp) {
fn return_block_bodies(&self, io: &mut SyncIo, r: &Rlp) {
let mut count = r.item_count();
if count == 0 {
debug!(target: "sync", "Empty GetBlockBodies request, ignoring.");
@ -743,10 +769,11 @@ impl ChainSync {
}
let mut rlp = RlpStream::new_list(added);
rlp.append_raw(&data, added);
io.network.respond(BLOCK_BODIES_PACKET, rlp.out());
io.network.respond(BLOCK_BODIES_PACKET, rlp.out()).unwrap_or_else(|e|
debug!(target: "sync", "Error sending headers: {:?}", e));
}
fn return_node_data(&self, io: &mut SyncIo, peer_id: &PeerId, r: &Rlp) {
fn return_node_data(&self, io: &mut SyncIo, r: &Rlp) {
let mut count = r.item_count();
if count == 0 {
debug!(target: "sync", "Empty GetNodeData request, ignoring.");
@ -766,10 +793,11 @@ impl ChainSync {
}
let mut rlp = RlpStream::new_list(added);
rlp.append_raw(&data, added);
io.network.respond(NODE_DATA_PACKET, rlp.out());
io.network.respond(NODE_DATA_PACKET, rlp.out()).unwrap_or_else(|e|
debug!(target: "sync", "Error sending headers: {:?}", e));
}
fn return_receipts(&self, io: &mut SyncIo, peer_id: &PeerId, r: &Rlp) {
fn return_receipts(&self, io: &mut SyncIo, r: &Rlp) {
let mut count = r.item_count();
if count == 0 {
debug!(target: "sync", "Empty GetReceipts request, ignoring.");
@ -789,7 +817,8 @@ impl ChainSync {
}
let mut rlp = RlpStream::new_list(added);
rlp.append_raw(&data, added);
io.network.respond(RECEIPTS_PACKET, rlp.out());
io.network.respond(RECEIPTS_PACKET, rlp.out()).unwrap_or_else(|e|
debug!(target: "sync", "Error sending headers: {:?}", e));
}
pub fn on_packet(&mut self, io: &mut SyncIo, peer: &PeerId, packet_id: u8, data: &[u8]) {
@ -797,170 +826,19 @@ impl ChainSync {
match packet_id {
STATUS_PACKET => self.on_peer_status(io, peer, &rlp),
TRANSACTIONS_PACKET => self.on_peer_transactions(io, peer, &rlp),
GET_BLOCK_HEADERS_PACKET => self.return_block_headers(io, peer, &rlp),
GET_BLOCK_HEADERS_PACKET => self.return_block_headers(io, &rlp),
BLOCK_HEADERS_PACKET => self.on_peer_block_headers(io, peer, &rlp),
GET_BLOCK_BODIES_PACKET => self.return_block_bodies(io, peer, &rlp),
GET_BLOCK_BODIES_PACKET => self.return_block_bodies(io, &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),
GET_NODE_DATA_PACKET => self.return_node_data(io, peer, &rlp),
GET_RECEIPTS_PACKET => self.return_receipts(io, peer, &rlp),
GET_NODE_DATA_PACKET => self.return_node_data(io, &rlp),
GET_RECEIPTS_PACKET => self.return_receipts(io, &rlp),
_ => debug!(target: "sync", "Unkown packet {}", packet_id)
}
}
}
pub trait ToUsize {
fn to_usize(&self) -> usize;
}
pub trait FromUsize {
fn from_usize(s: usize) -> Self;
}
impl ToUsize for BlockNumber {
fn to_usize(&self) -> usize {
*self as usize
pub fn maintain_sync(&mut self, _io: &mut SyncIo) {
}
}
impl FromUsize for BlockNumber {
fn from_usize(s: usize) -> BlockNumber {
s as BlockNumber
}
}
pub trait RangeCollection<K, V> {
fn have_item(&self, key: &K) -> bool;
fn find_item(&self, key: &K) -> Option<&V>;
fn get_tail(&mut self, key: &K) -> Range<K>;
fn remove_head(&mut self, start: &K);
fn remove_tail(&mut self, start: &K);
fn insert_item(&mut self, key: K, value: V);
}
impl<K, V> RangeCollection<K, V> for Vec<(K, Vec<V>)> where K: Ord + PartialEq + Add<Output = K> + Sub<Output = K> + Copy + FromUsize + ToUsize {
fn have_item(&self, key: &K) -> bool {
match self.binary_search_by(|&(k, _)| k.cmp(key).reverse()) {
Ok(_) => true,
Err(index) => match self.get(index + 1) {
Some(&(ref k, ref v)) => k <= key && (*k + FromUsize::from_usize(v.len())) > *key,
_ => false
},
}
}
fn find_item(&self, key: &K) -> Option<&V> {
match self.binary_search_by(|&(k, _)| k.cmp(key).reverse()) {
Ok(index) => self.get(index).unwrap().1.get(0),
Err(index) => match self.get(index + 1) {
Some(&(ref k, ref v)) if k <= key && (*k + FromUsize::from_usize(v.len())) > *key => v.get((*key - *k).to_usize()),
_ => None
},
}
}
/// Get a range of elements from start till the end of the range
fn get_tail(&mut self, key: &K) -> Range<K> {
let kv = *key;
match self.binary_search_by(|&(k, _)| k.cmp(key).reverse()) {
Ok(index) => kv..(kv + FromUsize::from_usize(self[index].1.len())),
Err(index) => {
let mut empty = false;
match self.get_mut(index + 1) {
Some(&mut (ref k, ref mut v)) if k <= key && (*k + FromUsize::from_usize(v.len())) > *key => {
kv..(*k + FromUsize::from_usize(v.len()))
}
_ => kv..kv
}
},
}
}
/// Remove element key and following elements in the same range
fn remove_tail(&mut self, key: &K) {
match self.binary_search_by(|&(k, _)| k.cmp(key).reverse()) {
Ok(index) => { self.remove(index); },
Err(index) =>{
let mut empty = false;
match self.get_mut(index + 1) {
Some(&mut (ref k, ref mut v)) if k <= key && (*k + FromUsize::from_usize(v.len())) > *key => {
v.truncate((*key - *k).to_usize());
empty = v.is_empty();
}
_ => {}
}
if empty {
self.remove(index + 1);
}
},
}
}
/// Remove range elements up to key
fn remove_head(&mut self, key: &K) {
if *key == FromUsize::from_usize(0) {
return
}
let prev = *key - FromUsize::from_usize(1);
match self.binary_search_by(|&(k, _)| k.cmp(&prev).reverse()) {
Ok(index) => { self.remove(index); },
Err(index) => {
let mut empty = false;
match self.get_mut(index + 1) {
Some(&mut (ref mut k, ref mut v)) if *k <= prev && (*k + FromUsize::from_usize(v.len())) > *key => {
let head = v.split_off((*key - *k).to_usize());
empty = head.is_empty();
let removed = ::std::mem::replace(v, head);
let new_k = *k - FromUsize::from_usize(removed.len());
::std::mem::replace(k, new_k);
}
_ => {}
}
if empty {
self.remove(index + 1);
}
},
}
}
fn insert_item(&mut self, key: K, value: V) {
assert!(!self.have_item(&key));
let mut lower = match self.binary_search_by(|&(k, _)| k.cmp(&key).reverse()) {
Ok(index) => index,
Err(index) => index,
};
lower += 1;
let mut to_remove: Option<usize> = None;
if lower < self.len() && self[lower].0 + FromUsize::from_usize(self[lower].1.len()) == key {
// extend into existing chunk
self[lower].1.push(value);
}
else {
// insert a new chunk
let mut range: Vec<V> = vec![value];
self.insert(lower, (key, range));
};
let next = lower - 1;
if next < self.len()
{
{
let (mut next, mut inserted) = self.split_at_mut(lower);
let mut next = next.last_mut().unwrap();
let mut inserted = inserted.first_mut().unwrap();
if next.0 == key + FromUsize::from_usize(1)
{
inserted.1.append(&mut next.1);
to_remove = Some(lower - 1);
}
}
if let Some(r) = to_remove {
self.remove(r);
}
}
}
}

40
src/sync/mod.rs
View File

@ -4,21 +4,48 @@ use util::network::{ProtocolHandler, NetworkService, HandlerIo, TimerToken, Peer
use sync::chain::{ChainSync, SyncIo};
mod chain;
mod range_collection;
#[cfg(test)]
mod tests;
pub fn new(service: &mut NetworkService, eth_cleint: Arc<BlockChainClient>) {
pub fn new(_service: &mut NetworkService, eth_client: Arc<BlockChainClient+Send+Sized>) -> EthSync {
EthSync {
chain: eth_client,
sync: ChainSync::new(),
}
}
struct EthSync {
idle: bool,
pub struct EthSync {
chain: Arc<BlockChainClient+Send+Sized>,
sync: ChainSync
}
pub use self::chain::SyncStatus;
impl EthSync {
pub fn is_syncing(&self) -> bool {
self.sync.is_syncing()
}
pub fn status(&self) -> SyncStatus {
self.sync.status()
}
pub fn stop_network(&mut self, io: &mut HandlerIo) {
self.sync.abort(&mut SyncIo::new(io, Arc::get_mut(&mut self.chain).unwrap()));
}
pub fn start_network(&mut self, io: &mut HandlerIo) {
self.sync.restart(&mut SyncIo::new(io, Arc::get_mut(&mut self.chain).unwrap()));
}
}
impl ProtocolHandler for EthSync {
fn initialize(&mut self, io: &mut HandlerIo) {
io.register_timer(1000);
self.sync.restart(&mut SyncIo::new(io, Arc::get_mut(&mut self.chain).unwrap()));
io.register_timer(1000).unwrap();
}
fn read(&mut self, io: &mut HandlerIo, peer: &PeerId, packet_id: u8, data: &[u8]) {
@ -33,7 +60,8 @@ impl ProtocolHandler for EthSync {
self.sync.on_peer_aborting(&mut SyncIo::new(io, Arc::get_mut(&mut self.chain).unwrap()), peer);
}
fn timeout(&mut self, io: &mut HandlerIo, timer: TimerToken) {
fn timeout(&mut self, io: &mut HandlerIo, _timer: TimerToken) {
self.sync.maintain_sync(&mut SyncIo::new(io, Arc::get_mut(&mut self.chain).unwrap()));
}
}

136
src/sync/range_collection Normal file
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@ -0,0 +1,136 @@
pub trait RangeCollection<K, V> {
fn have_item(&self, key: &K) -> bool;
fn find_item(&self, key: &K) -> Option<&V>;
fn get_tail(&mut self, key: &K) -> Range<K>;
fn remove_head(&mut self, start: &K);
fn remove_tail(&mut self, start: &K);
fn insert_item(&mut self, key: K, value: V);
}
impl<K, V> RangeCollection<K, V> for Vec<(K, Vec<V>)> where K: Ord + PartialEq + Add<Output = K> + Sub<Output = K> + Copy + FromUsize + ToUsize {
fn have_item(&self, key: &K) -> bool {
match self.binary_search_by(|&(k, _)| k.cmp(key).reverse()) {
Ok(_) => true,
Err(index) => match self.get(index + 1) {
Some(&(ref k, ref v)) => k <= key && (*k + FromUsize::from_usize(v.len())) > *key,
_ => false
},
}
}
fn find_item(&self, key: &K) -> Option<&V> {
match self.binary_search_by(|&(k, _)| k.cmp(key).reverse()) {
Ok(index) => self.get(index).unwrap().1.get(0),
Err(index) => match self.get(index + 1) {
Some(&(ref k, ref v)) if k <= key && (*k + FromUsize::from_usize(v.len())) > *key => v.get((*key - *k).to_usize()),
_ => None
},
}
}
/// Get a range of elements from start till the end of the range
fn get_tail(&mut self, key: &K) -> Range<K> {
let kv = *key;
match self.binary_search_by(|&(k, _)| k.cmp(key).reverse()) {
Ok(index) => kv..(kv + FromUsize::from_usize(self[index].1.len())),
Err(index) => {
let mut empty = false;
match self.get_mut(index + 1) {
Some(&mut (ref k, ref mut v)) if k <= key && (*k + FromUsize::from_usize(v.len())) > *key => {
kv..(*k + FromUsize::from_usize(v.len()))
}
_ => kv..kv
}
},
}
}
/// Remove element key and following elements in the same range
fn remove_tail(&mut self, key: &K) {
match self.binary_search_by(|&(k, _)| k.cmp(key).reverse()) {
Ok(index) => { self.remove(index); },
Err(index) =>{
let mut empty = false;
match self.get_mut(index + 1) {
Some(&mut (ref k, ref mut v)) if k <= key && (*k + FromUsize::from_usize(v.len())) > *key => {
v.truncate((*key - *k).to_usize());
empty = v.is_empty();
}
_ => {}
}
if empty {
self.remove(index + 1);
}
},
}
}
/// Remove range elements up to key
fn remove_head(&mut self, key: &K) {
if *key == FromUsize::from_usize(0) {
return
}
let prev = *key - FromUsize::from_usize(1);
match self.binary_search_by(|&(k, _)| k.cmp(&prev).reverse()) {
Ok(index) => { self.remove(index); },
Err(index) => {
let mut empty = false;
match self.get_mut(index + 1) {
Some(&mut (ref mut k, ref mut v)) if *k <= prev && (*k + FromUsize::from_usize(v.len())) > *key => {
let head = v.split_off((*key - *k).to_usize());
empty = head.is_empty();
let removed = ::std::mem::replace(v, head);
let new_k = *k - FromUsize::from_usize(removed.len());
::std::mem::replace(k, new_k);
}
_ => {}
}
if empty {
self.remove(index + 1);
}
},
}
}
fn insert_item(&mut self, key: K, value: V) {
assert!(!self.have_item(&key));
let mut lower = match self.binary_search_by(|&(k, _)| k.cmp(&key).reverse()) {
Ok(index) => index,
Err(index) => index,
};
lower += 1;
let mut to_remove: Option<usize> = None;
if lower < self.len() && self[lower].0 + FromUsize::from_usize(self[lower].1.len()) == key {
// extend into existing chunk
self[lower].1.push(value);
}
else {
// insert a new chunk
let mut range: Vec<V> = vec![value];
self.insert(lower, (key, range));
};
let next = lower - 1;
if next < self.len()
{
{
let (mut next, mut inserted) = self.split_at_mut(lower);
let mut next = next.last_mut().unwrap();
let mut inserted = inserted.first_mut().unwrap();
if next.0 == key + FromUsize::from_usize(1)
{
inserted.1.append(&mut next.1);
to_remove = Some(lower - 1);
}
}
if let Some(r) = to_remove {
self.remove(r);
}
}
}
}

244
src/sync/range_collection.rs Normal file
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use std::ops::{Add, Sub, Range};
pub trait ToUsize {
fn to_usize(&self) -> usize;
}
pub trait FromUsize {
fn from_usize(s: usize) -> Self;
}
pub trait RangeCollection<K, V> {
fn have_item(&self, key: &K) -> bool;
fn find_item(&self, key: &K) -> Option<&V>;
fn get_tail(&mut self, key: &K) -> Range<K>;
fn remove_head(&mut self, start: &K);
fn remove_tail(&mut self, start: &K);
fn insert_item(&mut self, key: K, value: V);
fn range_iter<'c>(&'c self) -> RangeIterator<'c, K, V>;
}
pub struct RangeIterator<'c, K:'c, V:'c> {
range: usize,
collection: &'c Vec<(K, Vec<V>)>
}
impl<'c, K:'c, V:'c> Iterator for RangeIterator<'c, K, V> where K: Add<Output = K> + FromUsize + ToUsize + Copy {
type Item = (K, &'c [V]);
// The 'Iterator' trait only requires the 'next' method to be defined. The
// return type is 'Option<T>', 'None' is returned when the 'Iterator' is
// over, otherwise the next value is returned wrapped in 'Some'
fn next(&mut self) -> Option<(K, &'c [V])> {
if self.range > 0 {
self.range -= 1;
}
else {
return None;
}
match self.collection.get(self.range) {
Some(&(ref k, ref vec)) => {
Some((*k, &vec))
},
None => None
}
}
}
impl<K, V> RangeCollection<K, V> for Vec<(K, Vec<V>)> where K: Ord + PartialEq + Add<Output = K> + Sub<Output = K> + Copy + FromUsize + ToUsize {
fn range_iter<'c>(&'c self) -> RangeIterator<'c, K, V> {
RangeIterator {
range: self.len(),
collection: self
}
}
fn have_item(&self, key: &K) -> bool {
match self.binary_search_by(|&(k, _)| k.cmp(key).reverse()) {
Ok(_) => true,
Err(index) => match self.get(index) {
Some(&(ref k, ref v)) => k <= key && (*k + FromUsize::from_usize(v.len())) > *key,
_ => false
},
}
}
fn find_item(&self, key: &K) -> Option<&V> {
match self.binary_search_by(|&(k, _)| k.cmp(key).reverse()) {
Ok(index) => self.get(index).unwrap().1.get(0),
Err(index) => match self.get(index) {
Some(&(ref k, ref v)) if k <= key && (*k + FromUsize::from_usize(v.len())) > *key => v.get((*key - *k).to_usize()),
_ => None
},
}
}
/// Get a range of elements from start till the end of the range
fn get_tail(&mut self, key: &K) -> Range<K> {
let kv = *key;
match self.binary_search_by(|&(k, _)| k.cmp(key).reverse()) {
Ok(index) => kv..(kv + FromUsize::from_usize(self[index].1.len())),
Err(index) => {
match self.get_mut(index) {
Some(&mut (ref k, ref mut v)) if k <= key && (*k + FromUsize::from_usize(v.len())) > *key => {
kv..(*k + FromUsize::from_usize(v.len()))
}
_ => kv..kv
}
},
}
}
/// Remove element key and following elements in the same range
fn remove_tail(&mut self, key: &K) {
match self.binary_search_by(|&(k, _)| k.cmp(key).reverse()) {
Ok(index) => { self.remove(index); },
Err(index) =>{
let mut empty = false;
match self.get_mut(index) {
Some(&mut (ref k, ref mut v)) if k <= key && (*k + FromUsize::from_usize(v.len())) > *key => {
v.truncate((*key - *k).to_usize());
empty = v.is_empty();
}
_ => {}
}
if empty {
self.remove(index);
}
},
}
}
/// Remove range elements up to key
fn remove_head(&mut self, key: &K) {
if *key == FromUsize::from_usize(0) {
return
}
let prev = *key - FromUsize::from_usize(1);
match self.binary_search_by(|&(k, _)| k.cmp(key).reverse()) {
Ok(_) => { }, //start of range, do nothing.
Err(index) => {
let mut empty = false;
match self.get_mut(index) {
Some(&mut (ref mut k, ref mut v)) if *k <= prev && (*k + FromUsize::from_usize(v.len())) > prev => {
let tail = v.split_off((*key - *k).to_usize());
empty = tail.is_empty();
let removed = ::std::mem::replace(v, tail);
let new_k = *k + FromUsize::from_usize(removed.len());
::std::mem::replace(k, new_k);
}
_ => {}
}
if empty {
self.remove(index);
}
},
}
}
fn insert_item(&mut self, key: K, value: V) {
assert!(!self.have_item(&key));
let lower = match self.binary_search_by(|&(k, _)| k.cmp(&key).reverse()) {
Ok(index) => index,
Err(index) => index,
};
let mut to_remove: Option<usize> = None;
if lower < self.len() && self[lower].0 + FromUsize::from_usize(self[lower].1.len()) == key {
// extend into existing chunk
self[lower].1.push(value);
}
else {
// insert a new chunk
let range: Vec<V> = vec![value];
self.insert(lower, (key, range));
};
if lower > 0 {
let next = lower - 1;
if next < self.len()
{
{
let (mut next, mut inserted) = self.split_at_mut(lower);
let mut next = next.last_mut().unwrap();
let mut inserted = inserted.first_mut().unwrap();
if next.0 == key + FromUsize::from_usize(1)
{
inserted.1.append(&mut next.1);
to_remove = Some(lower - 1);
}
}
if let Some(r) = to_remove {
self.remove(r);
}
}
}
}
}
#[test]
fn test_range() {
use std::cmp::{Ordering};
let mut ranges: Vec<(u32, Vec<char>)> = Vec::new();
assert_eq!(ranges.range_iter().next(), None);
assert_eq!(ranges.find_item(&1), None);
assert!(!ranges.have_item(&1));
assert_eq!(ranges.get_tail(&0), 0..0);
ranges.insert_item(17, 'q');
assert_eq!(ranges.range_iter().cmp(vec![(17, &['q'][..])]), Ordering::Equal);
assert_eq!(ranges.find_item(&17), Some(&'q'));
assert!(ranges.have_item(&17));
assert_eq!(ranges.get_tail(&17), 17..18);
ranges.insert_item(18, 'r');
assert_eq!(ranges.range_iter().cmp(vec![(17, &['q', 'r'][..])]), Ordering::Equal);
assert_eq!(ranges.find_item(&18), Some(&'r'));
assert!(ranges.have_item(&18));
assert_eq!(ranges.get_tail(&17), 17..19);
ranges.insert_item(16, 'p');
assert_eq!(ranges.range_iter().cmp(vec![(16, &['p', 'q', 'r'][..])]), Ordering::Equal);
assert_eq!(ranges.find_item(&16), Some(&'p'));
assert_eq!(ranges.find_item(&17), Some(&'q'));
assert_eq!(ranges.find_item(&18), Some(&'r'));
assert!(ranges.have_item(&16));
assert_eq!(ranges.get_tail(&17), 17..19);
ranges.insert_item(2, 'b');
assert_eq!(ranges.range_iter().cmp(vec![(2, &['b'][..]), (16, &['p', 'q', 'r'][..])]), Ordering::Equal);
assert_eq!(ranges.find_item(&2), Some(&'b'));
ranges.insert_item(3, 'c');
ranges.insert_item(4, 'd');
assert_eq!(ranges.get_tail(&3), 3..5);
assert_eq!(ranges.range_iter().cmp(vec![(2, &['b', 'c', 'd'][..]), (16, &['p', 'q', 'r'][..])]), Ordering::Equal);
let mut r = ranges.clone();
r.remove_head(&1);
assert_eq!(r.range_iter().cmp(vec![(2, &['b', 'c', 'd'][..]), (16, &['p', 'q', 'r'][..])]), Ordering::Equal);
r.remove_head(&2);
assert_eq!(r.range_iter().cmp(vec![(2, &['b', 'c', 'd'][..]), (16, &['p', 'q', 'r'][..])]), Ordering::Equal);
r.remove_head(&3);
assert_eq!(r.range_iter().cmp(vec![(3, &['c', 'd'][..]), (16, &['p', 'q', 'r'][..])]), Ordering::Equal);
r.remove_head(&10);
assert_eq!(r.range_iter().cmp(vec![(3, &['c', 'd'][..]), (16, &['p', 'q', 'r'][..])]), Ordering::Equal);
r.remove_head(&5);
assert_eq!(r.range_iter().cmp(vec![(16, &['p', 'q', 'r'][..])]), Ordering::Equal);
r.remove_head(&19);
assert_eq!(r.range_iter().next(), None);
let mut r = ranges.clone();
r.remove_tail(&20);
assert_eq!(r.range_iter().cmp(vec![(2, &['b', 'c', 'd'][..]), (16, &['p', 'q', 'r'][..])]), Ordering::Equal);
r.remove_tail(&17);
assert_eq!(r.range_iter().cmp(vec![(2, &['b', 'c', 'd'][..]), (16, &['p'][..])]), Ordering::Equal);
r.remove_tail(&16);
assert_eq!(r.range_iter().cmp(vec![(2, &['b', 'c', 'd'][..])]), Ordering::Equal);
r.remove_tail(&3);
assert_eq!(r.range_iter().cmp(vec![(2, &['b'][..])]), Ordering::Equal);
r.remove_tail(&2);
assert_eq!(r.range_iter().next(), None);
}

13
src/sync/tests.rs Normal file
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use std::collections::HashMap;
use util::bytes::Bytes;
use util::hash::H256;
struct TestBlockChainClient {
blocks: Vec<Bytes>,
hashes: HashMap<H256, usize>,
}
#[test]
fn full_sync() {
}