skeleton and request traits

This commit is contained in:
Robert Habermeier 2016-10-27 15:45:59 +02:00
parent a7e420d9ec
commit 3a5843c40f
5 changed files with 213 additions and 28 deletions

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@ -68,6 +68,11 @@ impl Client {
pub fn queue_info(&self) -> QueueInfo {
self.header_queue.queue_info()
}
/// Get the chain info.
pub fn chain_info(&self) -> ChainInfo {
}
}
impl Provider for Client {

33
ethcore/src/light/sync.rs Normal file
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@ -0,0 +1,33 @@
// Copyright 2015, 2016 Ethcore (UK) Ltd.
// This file is part of Parity.
// Parity is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// Parity is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with Parity. If not, see <http://www.gnu.org/licenses/>.
//! A light sync target.
use block_import_error::BlockImportError;
use client::BlockChainInfo;
use util::hash::H256;
pub trait Sync {
/// Whether syncing is enabled.
fn enabled(&self) -> bool;
/// Current chain info.
fn chain_info(&self) -> BlockChainInfo;
/// Import a header.
fn import_header(&self, header_bytes: Vec<u8>) -> Result<H256, BlockImportError>;
}

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@ -24,8 +24,10 @@ use io::TimerToken;
use network::{NetworkProtocolHandler, NetworkService, NetworkContext, NetworkError, PeerId};
use rlp::{DecoderError, RlpStream, Stream, UntrustedRlp, View};
use util::hash::H256;
use parking_lot::{Mutex, RwLock};
use std::collections::HashMap;
use std::collections::{HashMap, HashSet};
use std::sync::atomic::{AtomicUsize, Ordering};
const TIMEOUT: TimerToken = 0;
const TIMEOUT_INTERVAL_MS: u64 = 1000;
@ -84,29 +86,18 @@ mod packet {
pub const GET_TRANSACTION_PROOFS: u8 = 0x12;
pub const TRANSACTION_PROOFS: u8 = 0x13;
}
// which direction a request should go in.
enum Direction {
Forwards,
Reverse,
}
// A request made to a peer.
enum Request {
// a request for headers:
// (number, hash), maximum, skip, direction.
Headers((u64, H256), u64, u64, Direction),
// a request for block bodies by hashes.
Bodies(Vec<H256>),
// a request for tx receipts by hashes.
Receipts(Vec<H256>),
// a request for contract code by (block hash, address hash).
Code(Vec<(H256, H256)>),
struct Request;
struct Requested {
timestamp: usize,
total: Request,
}
// data about each peer.
struct Peer {
pending_requests: HashMap<usize, Request>, // requests pending for peer.
buffer: u64, // remaining buffer value.
current_asking: HashSet<usize>, // pending request ids.
}
/// This handles synchronization of the header chain for a light client.
@ -115,15 +106,25 @@ pub struct Chain {
genesis_hash: H256,
mainnet: bool,
peers: RwLock<HashMap<PeerId, Peer>>,
pending_requests: RwLock<HashMap<usize, Requested>>,
req_id: AtomicUsize,
}
impl Chain {
// make a request to a given peer.
fn request_from(&self, peer: &PeerId, req: Request) {
unimplemented!()
}
// called when a peer connects.
fn on_connect(&self, peer: &PeerId, io: &NetworkContext) {
let peer = *peer;
match self.send_status(peer, io) {
Ok(()) => {
self.peers.write().insert(peer, Peer);
self.peers.write().insert(peer, Peer {
buffer: 0,
current_asking: HashSet::new(),
});
}
Err(e) => {
trace!(target: "les", "Error while sending status: {}", e);
@ -133,8 +134,9 @@ impl Chain {
}
// called when a peer disconnects.
fn on_disconnect(&self, peer: PeerId) {
self.peers.write().remove(peer);
fn on_disconnect(&self, peer: PeerId, io: &NetworkContext) {
// TODO: reassign all requests assigned to this peer.
self.peers.write().remove(&peer);
}
fn send_status(&self, peer: PeerId, io: &NetworkContext) -> Result<(), NetworkError> {
@ -165,6 +167,11 @@ impl Chain {
io.send(peer, packet::STATUS, stream.out())
}
/// Check on the status of all pending requests.
fn check_pending_requests(&self) {
unimplemented!()
}
fn status(&self, peer: &PeerId, io: &NetworkContext) {
unimplemented!()
}
@ -177,7 +184,9 @@ impl Chain {
}
// Handle a request for block headers.
fn get_block_headers(&self, peers: &PeerId, io: &NetworkContext, data: UntrustedRlp) {
fn get_block_headers(&self, peer: &PeerId, io: &NetworkContext, data: UntrustedRlp) {
const MAX_HEADERS: usize = 512;
unimplemented!()
}

138
sync/src/light/request.rs Normal file
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@ -0,0 +1,138 @@
// 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/>.
//! LES request types.
use util::bigint::prelude::*;
use rlp::*;
/// An LES request. This defines its data format, and the format of its response type.
pub trait Request: Sized {
/// The response type of this request.
type Response: Response;
/// The error type when decoding a response.
type Error;
/// Whether this request is empty.
fn is_empty(&self) -> bool;
/// The remainder of this request unfulfilled by the response. Required to return
/// an equivalent request when provided with an empty response.
fn remainder(&self, res: &Self::Response) -> Self;
/// Attempt to parse raw data into a response object
/// or an error. Behavior undefined if the raw data didn't originate from
/// this request.
fn parse_response(&self, raw: &[u8]) -> Result<Self::Response, Self::Error>;
}
/// Request responses. These must have a combination operation used to fill the gaps
/// in one response with data from another.
pub trait Response: Sized {
/// Combine the two responses into one. This can only be relied on to behave correctly
/// if `other` is a response to a sub-request of the request this response was
/// produced from.
fn combine(&mut self, other: Self);
}
/// A request for block bodies.
pub struct BlockBodies {
hashes: Vec<H256>,
}
/// A response for block bodies.
pub struct BlockBodiesResponse {
bodies: Vec<(H256, Vec<u8>)>,
}
impl Request for BlockBodies {
type Response = BlockBodiesResponse;
type Error = ::rlp::DecoderError;
fn is_empty(&self) -> bool { self.hashes.is_empty() }
fn remainder(&self, res: &Self::Response) -> Self {
let mut remaining = Vec::new();
let bodies = res.bodies.iter().map(|&(_, ref b) b).chain(::std::iter::repeat(&Vec::new()));
for (hash, body) in self.hashes.iter().zip(bodies) {
if body.is_empty() {
remaining.push(hash);
}
}
BlockBodies {
hashes: remaining,
}
}
fn parse_response(&self, raw: &[u8]) -> Result<Self::Response, Self::Error> {
use ethcore::transaction::SignedTransaction;
use ethcore::header::Header;
let rlp = UntrustedRlp::new(raw);
let mut bodies = Vec::with_capacity(self.hashes.len());
let items = rlp.iter();
for hash in self.hashes.iter().cloned() {
let res_bytes = match items.next() {
Some(rlp) => {
// perform basic block verification.
// TODO: custom error type?
try!(rlp.val_at::<Vec<SignedTransaction>>(0)
.and_then(|_| rlp.val_at::<Vec<Header>>(1)));
try!(rlp.data()).to_owned()
}
None => Vec::new(),
};
bodies.push((hash, res_bytes));
}
Ok(BlockBodiesResponse {
bodies: bodies,
})
}
}
impl Response for BlockBodiesResponse {
fn identity() -> Self {
BlockBodiesResponse {
bodies: Vec::new(),
}
}
fn combine(&mut self, other: Self) {
let other_iter = other.bodies.into_iter();
'a:
for &mut (ref my_hash, ref mut my_body) in self.bodies.iter_mut() {
loop {
match other_iter.next() {
Some((hash, body)) if hash == my_hash && !body.is_empty() => {
*my_body = body.to_owned();
break
}
Some(_) => continue,
None => break 'a,
}
}
}
}
}