openethereum/util/network/src/node_table.rs
2016-09-01 14:49:12 +02:00

436 lines
14 KiB
Rust

// Copyright 2015, 2016 Ethcore (UK) Ltd.
// This file is part of Parity.
// Parity is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// Parity is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with Parity. If not, see <http://www.gnu.org/licenses/>.
use std::mem;
use std::slice::from_raw_parts;
use std::net::{SocketAddr, ToSocketAddrs, SocketAddrV4, SocketAddrV6, Ipv4Addr, Ipv6Addr};
use std::hash::{Hash, Hasher};
use std::str::{FromStr};
use std::collections::{HashMap, HashSet};
use std::fmt::{Display, Formatter};
use std::path::{PathBuf};
use std::fmt;
use std::fs;
use std::io::{Read, Write};
use util::hash::*;
use util::UtilError;
use rlp::*;
use time::Tm;
use error::NetworkError;
use discovery::{TableUpdates, NodeEntry};
use ip_utils::*;
pub use rustc_serialize::json::Json;
/// Node public key
pub type NodeId = H512;
#[derive(Debug, Clone)]
/// Node address info
pub struct NodeEndpoint {
/// IP(V4 or V6) address
pub address: SocketAddr,
/// Conneciton port.
pub udp_port: u16
}
impl NodeEndpoint {
pub fn udp_address(&self) -> SocketAddr {
match self.address {
SocketAddr::V4(a) => SocketAddr::V4(SocketAddrV4::new(a.ip().clone(), self.udp_port)),
SocketAddr::V6(a) => SocketAddr::V6(SocketAddrV6::new(a.ip().clone(), self.udp_port, a.flowinfo(), a.scope_id())),
}
}
}
impl NodeEndpoint {
pub fn from_rlp(rlp: &UntrustedRlp) -> Result<Self, DecoderError> {
let tcp_port = try!(rlp.val_at::<u16>(2));
let udp_port = try!(rlp.val_at::<u16>(1));
let addr_bytes = try!(try!(rlp.at(0)).data());
let address = try!(match addr_bytes.len() {
4 => Ok(SocketAddr::V4(SocketAddrV4::new(Ipv4Addr::new(addr_bytes[0], addr_bytes[1], addr_bytes[2], addr_bytes[3]), tcp_port))),
16 => unsafe {
let o: *const u16 = mem::transmute(addr_bytes.as_ptr());
let o = from_raw_parts(o, 8);
Ok(SocketAddr::V6(SocketAddrV6::new(Ipv6Addr::new(o[0], o[1], o[2], o[3], o[4], o[5], o[6], o[7]), tcp_port, 0, 0)))
},
_ => Err(DecoderError::RlpInconsistentLengthAndData)
});
Ok(NodeEndpoint { address: address, udp_port: udp_port })
}
pub fn to_rlp(&self, rlp: &mut RlpStream) {
match self.address {
SocketAddr::V4(a) => {
rlp.append(&(&a.ip().octets()[..]));
}
SocketAddr::V6(a) => unsafe {
let o: *const u8 = mem::transmute(a.ip().segments().as_ptr());
rlp.append(&from_raw_parts(o, 16));
}
};
rlp.append(&self.udp_port);
rlp.append(&self.address.port());
}
pub fn to_rlp_list(&self, rlp: &mut RlpStream) {
rlp.begin_list(3);
self.to_rlp(rlp);
}
pub fn is_valid(&self) -> bool {
self.udp_port != 0 && self.address.port() != 0 &&
match self.address {
SocketAddr::V4(a) => !a.ip().is_unspecified_s(),
SocketAddr::V6(a) => !a.ip().is_unspecified_s()
}
}
pub fn is_global(&self) -> bool {
match self.address {
SocketAddr::V4(a) => a.ip().is_global_s(),
SocketAddr::V6(a) => a.ip().is_global_s()
}
}
}
impl FromStr for NodeEndpoint {
type Err = NetworkError;
/// Create endpoint from string. Performs name resolution if given a host name.
fn from_str(s: &str) -> Result<NodeEndpoint, NetworkError> {
let address = s.to_socket_addrs().map(|mut i| i.next());
match address {
Ok(Some(a)) => Ok(NodeEndpoint {
address: a,
udp_port: a.port()
}),
Ok(_) => Err(NetworkError::AddressResolve(None)),
Err(e) => Err(NetworkError::AddressResolve(Some(e)))
}
}
}
#[derive(PartialEq, Eq, Copy, Clone)]
pub enum PeerType {
_Required,
Optional
}
pub struct Node {
pub id: NodeId,
pub endpoint: NodeEndpoint,
pub peer_type: PeerType,
pub failures: u32,
pub last_attempted: Option<Tm>,
}
impl Node {
pub fn new(id: NodeId, endpoint: NodeEndpoint) -> Node {
Node {
id: id,
endpoint: endpoint,
peer_type: PeerType::Optional,
failures: 0,
last_attempted: None,
}
}
}
impl Display for Node {
fn fmt(&self, f: &mut Formatter) -> fmt::Result {
if self.endpoint.udp_port != self.endpoint.address.port() {
try!(write!(f, "enode://{}@{}+{}", self.id.hex(), self.endpoint.address, self.endpoint.udp_port));
} else {
try!(write!(f, "enode://{}@{}", self.id.hex(), self.endpoint.address));
}
Ok(())
}
}
impl FromStr for Node {
type Err = NetworkError;
fn from_str(s: &str) -> Result<Self, Self::Err> {
let (id, endpoint) = if s.len() > 136 && &s[0..8] == "enode://" && &s[136..137] == "@" {
(try!(s[8..136].parse().map_err(UtilError::from)), try!(NodeEndpoint::from_str(&s[137..])))
}
else {
(NodeId::new(), try!(NodeEndpoint::from_str(s)))
};
Ok(Node {
id: id,
endpoint: endpoint,
peer_type: PeerType::Optional,
last_attempted: None,
failures: 0,
})
}
}
impl PartialEq for Node {
fn eq(&self, other: &Self) -> bool {
self.id == other.id
}
}
impl Eq for Node {}
impl Hash for Node {
fn hash<H>(&self, state: &mut H) where H: Hasher {
self.id.hash(state)
}
}
/// Node table backed by disk file.
pub struct NodeTable {
nodes: HashMap<NodeId, Node>,
useless_nodes: HashSet<NodeId>,
path: Option<String>,
}
impl NodeTable {
pub fn new(path: Option<String>) -> NodeTable {
NodeTable {
path: path.clone(),
nodes: NodeTable::load(path),
useless_nodes: HashSet::new(),
}
}
/// Add a node to table
pub fn add_node(&mut self, mut node: Node) {
// preserve failure counter
let failures = self.nodes.get(&node.id).map_or(0, |n| n.failures);
node.failures = failures;
self.nodes.insert(node.id.clone(), node);
}
/// Returns node ids sorted by number of failures
pub fn nodes(&self) -> Vec<NodeId> {
let mut refs: Vec<&Node> = self.nodes.values().filter(|n| !self.useless_nodes.contains(&n.id)).collect();
refs.sort_by(|a, b| a.failures.cmp(&b.failures));
refs.iter().map(|n| n.id.clone()).collect()
}
/// Unordered list of all entries
pub fn unordered_entries(&self) -> Vec<NodeEntry> {
// preserve failure counter
self.nodes.values().map(|n| NodeEntry { endpoint: n.endpoint.clone(), id: n.id.clone() }).collect()
}
/// Get particular node
pub fn get_mut(&mut self, id: &NodeId) -> Option<&mut Node> {
self.nodes.get_mut(id)
}
/// Apply table changes coming from discovery
pub fn update(&mut self, mut update: TableUpdates, reserved: &HashSet<NodeId>) {
for (_, node) in update.added.drain() {
let mut entry = self.nodes.entry(node.id.clone()).or_insert_with(|| Node::new(node.id.clone(), node.endpoint.clone()));
entry.endpoint = node.endpoint;
}
for r in update.removed {
if !reserved.contains(&r) {
self.nodes.remove(&r);
}
}
}
/// Increase failure counte for a node
pub fn note_failure(&mut self, id: &NodeId) {
if let Some(node) = self.nodes.get_mut(id) {
node.failures += 1;
}
}
/// Mark as useless, no furter attempts to connect until next call to `clear_useless`.
pub fn mark_as_useless(&mut self, id: &NodeId) {
self.useless_nodes.insert(id.clone());
}
/// Atempt to connect to useless nodes again.
pub fn clear_useless(&mut self) {
self.useless_nodes.clear();
}
fn save(&self) {
if let Some(ref path) = self.path {
let mut path_buf = PathBuf::from(path);
if let Err(e) = fs::create_dir_all(path_buf.as_path()) {
warn!("Error creating node table directory: {:?}", e);
return;
};
path_buf.push("nodes.json");
let mut json = String::new();
json.push_str("{\n");
json.push_str("\"nodes\": [\n");
let node_ids = self.nodes();
for i in 0 .. node_ids.len() {
let node = self.nodes.get(&node_ids[i]).unwrap();
json.push_str(&format!("\t{{ \"url\": \"{}\", \"failures\": {} }}{}\n", node, node.failures, if i == node_ids.len() - 1 {""} else {","}))
}
json.push_str("]\n");
json.push_str("}");
let mut file = match fs::File::create(path_buf.as_path()) {
Ok(file) => file,
Err(e) => {
warn!("Error creating node table file: {:?}", e);
return;
}
};
if let Err(e) = file.write(&json.into_bytes()) {
warn!("Error writing node table file: {:?}", e);
}
}
}
fn load(path: Option<String>) -> HashMap<NodeId, Node> {
let mut nodes: HashMap<NodeId, Node> = HashMap::new();
if let Some(path) = path {
let mut path_buf = PathBuf::from(path);
path_buf.push("nodes.json");
let mut file = match fs::File::open(path_buf.as_path()) {
Ok(file) => file,
Err(e) => {
debug!("Error opening node table file: {:?}", e);
return nodes;
}
};
let mut buf = String::new();
match file.read_to_string(&mut buf) {
Ok(_) => {},
Err(e) => {
warn!("Error reading node table file: {:?}", e);
return nodes;
}
}
let json = match Json::from_str(&buf) {
Ok(json) => json,
Err(e) => {
warn!("Error parsing node table file: {:?}", e);
return nodes;
}
};
if let Some(list) = json.as_object().and_then(|o| o.get("nodes")).and_then(|n| n.as_array()) {
for n in list.iter().filter_map(|n| n.as_object()) {
if let Some(url) = n.get("url").and_then(|u| u.as_string()) {
if let Ok(mut node) = Node::from_str(url) {
if let Some(failures) = n.get("failures").and_then(|f| f.as_u64()) {
node.failures = failures as u32;
}
nodes.insert(node.id.clone(), node);
}
}
}
}
}
nodes
}
}
impl Drop for NodeTable {
fn drop(&mut self) {
self.save();
}
}
/// Check if node url is valid
pub fn is_valid_node_url(url: &str) -> bool {
use std::str::FromStr;
Node::from_str(url).is_ok()
}
#[cfg(test)]
mod tests {
use super::*;
use std::str::FromStr;
use std::net::*;
use util::hash::*;
use devtools::*;
#[test]
fn endpoint_parse() {
let endpoint = NodeEndpoint::from_str("123.99.55.44:7770");
assert!(endpoint.is_ok());
let v4 = match endpoint.unwrap().address {
SocketAddr::V4(v4address) => v4address,
_ => panic!("should ve v4 address")
};
assert_eq!(SocketAddrV4::new(Ipv4Addr::new(123, 99, 55, 44), 7770), v4);
}
#[test]
fn node_parse() {
assert!(is_valid_node_url("enode://a979fb575495b8d6db44f750317d0f4622bf4c2aa3365d6af7c284339968eef29b69ad0dce72a4d8db5ebb4968de0e3bec910127f134779fbcb0cb6d3331163c@22.99.55.44:7770"));
let node = Node::from_str("enode://a979fb575495b8d6db44f750317d0f4622bf4c2aa3365d6af7c284339968eef29b69ad0dce72a4d8db5ebb4968de0e3bec910127f134779fbcb0cb6d3331163c@22.99.55.44:7770");
assert!(node.is_ok());
let node = node.unwrap();
let v4 = match node.endpoint.address {
SocketAddr::V4(v4address) => v4address,
_ => panic!("should ve v4 address")
};
assert_eq!(SocketAddrV4::new(Ipv4Addr::new(22, 99, 55, 44), 7770), v4);
assert_eq!(
H512::from_str("a979fb575495b8d6db44f750317d0f4622bf4c2aa3365d6af7c284339968eef29b69ad0dce72a4d8db5ebb4968de0e3bec910127f134779fbcb0cb6d3331163c").unwrap(),
node.id);
}
#[test]
fn table_failure_order() {
let node1 = Node::from_str("enode://a979fb575495b8d6db44f750317d0f4622bf4c2aa3365d6af7c284339968eef29b69ad0dce72a4d8db5ebb4968de0e3bec910127f134779fbcb0cb6d3331163c@22.99.55.44:7770").unwrap();
let node2 = Node::from_str("enode://b979fb575495b8d6db44f750317d0f4622bf4c2aa3365d6af7c284339968eef29b69ad0dce72a4d8db5ebb4968de0e3bec910127f134779fbcb0cb6d3331163c@22.99.55.44:7770").unwrap();
let node3 = Node::from_str("enode://c979fb575495b8d6db44f750317d0f4622bf4c2aa3365d6af7c284339968eef29b69ad0dce72a4d8db5ebb4968de0e3bec910127f134779fbcb0cb6d3331163c@22.99.55.44:7770").unwrap();
let id1 = H512::from_str("a979fb575495b8d6db44f750317d0f4622bf4c2aa3365d6af7c284339968eef29b69ad0dce72a4d8db5ebb4968de0e3bec910127f134779fbcb0cb6d3331163c").unwrap();
let id2 = H512::from_str("b979fb575495b8d6db44f750317d0f4622bf4c2aa3365d6af7c284339968eef29b69ad0dce72a4d8db5ebb4968de0e3bec910127f134779fbcb0cb6d3331163c").unwrap();
let id3 = H512::from_str("c979fb575495b8d6db44f750317d0f4622bf4c2aa3365d6af7c284339968eef29b69ad0dce72a4d8db5ebb4968de0e3bec910127f134779fbcb0cb6d3331163c").unwrap();
let mut table = NodeTable::new(None);
table.add_node(node3);
table.add_node(node1);
table.add_node(node2);
table.note_failure(&id1);
table.note_failure(&id1);
table.note_failure(&id2);
let r = table.nodes();
assert_eq!(r[0][..], id3[..]);
assert_eq!(r[1][..], id2[..]);
assert_eq!(r[2][..], id1[..]);
}
#[test]
fn table_save_load() {
let temp_path = RandomTempPath::create_dir();
let node1 = Node::from_str("enode://a979fb575495b8d6db44f750317d0f4622bf4c2aa3365d6af7c284339968eef29b69ad0dce72a4d8db5ebb4968de0e3bec910127f134779fbcb0cb6d3331163c@22.99.55.44:7770").unwrap();
let node2 = Node::from_str("enode://b979fb575495b8d6db44f750317d0f4622bf4c2aa3365d6af7c284339968eef29b69ad0dce72a4d8db5ebb4968de0e3bec910127f134779fbcb0cb6d3331163c@22.99.55.44:7770").unwrap();
let id1 = H512::from_str("a979fb575495b8d6db44f750317d0f4622bf4c2aa3365d6af7c284339968eef29b69ad0dce72a4d8db5ebb4968de0e3bec910127f134779fbcb0cb6d3331163c").unwrap();
let id2 = H512::from_str("b979fb575495b8d6db44f750317d0f4622bf4c2aa3365d6af7c284339968eef29b69ad0dce72a4d8db5ebb4968de0e3bec910127f134779fbcb0cb6d3331163c").unwrap();
{
let mut table = NodeTable::new(Some(temp_path.as_path().to_str().unwrap().to_owned()));
table.add_node(node1);
table.add_node(node2);
table.note_failure(&id2);
}
{
let table = NodeTable::new(Some(temp_path.as_path().to_str().unwrap().to_owned()));
let r = table.nodes();
assert_eq!(r[0][..], id1[..]);
assert_eq!(r[1][..], id2[..]);
}
}
}