801 lines
24 KiB
Rust
801 lines
24 KiB
Rust
#![allow(dead_code)]
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pub mod config;
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pub mod message;
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pub mod peer;
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use std::ops::{Deref, DerefMut};
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use std::{collections::VecDeque, fmt, io, net, net::IpAddr};
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use crossbeam_channel as chan;
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use fastrand::Rng;
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use git_url::Url;
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use log::*;
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use nakamoto::{LocalDuration, LocalTime};
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use nakamoto_net as nakamoto;
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use nakamoto_net::{Io, Link};
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use nonempty::NonEmpty;
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use crate::address_book;
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use crate::address_book::AddressBook;
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use crate::address_manager::AddressManager;
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use crate::clock::RefClock;
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use crate::collections::{HashMap, HashSet};
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use crate::crypto;
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use crate::identity::{ProjId, Project, UserId};
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use crate::protocol::config::ProjectTracking;
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use crate::protocol::message::Message;
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use crate::protocol::peer::{Peer, PeerError, PeerState};
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use crate::storage::{self, ReadRepository, WriteRepository};
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use crate::storage::{Inventory, WriteStorage};
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pub use crate::protocol::config::{Config, Network};
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pub const DEFAULT_PORT: u16 = 8776;
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pub const PROTOCOL_VERSION: u32 = 1;
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pub const TARGET_OUTBOUND_PEERS: usize = 8;
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pub const IDLE_INTERVAL: LocalDuration = LocalDuration::from_secs(30);
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pub const ANNOUNCE_INTERVAL: LocalDuration = LocalDuration::from_secs(30);
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pub const SYNC_INTERVAL: LocalDuration = LocalDuration::from_secs(60);
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pub const PRUNE_INTERVAL: LocalDuration = LocalDuration::from_mins(30);
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pub const MAX_CONNECTION_ATTEMPTS: usize = 3;
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pub const MAX_TIME_DELTA: LocalDuration = LocalDuration::from_mins(60);
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/// Network node identifier.
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pub type NodeId = crypto::PublicKey;
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/// Network routing table. Keeps track of where projects are hosted.
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pub type Routing = HashMap<ProjId, HashSet<NodeId>>;
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/// Seconds since epoch.
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pub type Timestamp = u64;
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/// A protocol event.
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#[derive(Debug, Clone)]
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pub enum Event {}
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/// Error returned by [`Command::Fetch`].
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#[derive(thiserror::Error, Debug)]
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pub enum FetchError {
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#[error(transparent)]
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Git(#[from] git2::Error),
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#[error(transparent)]
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Storage(#[from] storage::Error),
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}
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/// Result of looking up providers in our routing table.
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#[derive(Debug)]
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pub enum FetchLookup {
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Found {
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providers: NonEmpty<net::SocketAddr>,
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results: chan::Receiver<FetchResult>,
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},
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NotFound,
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Error(FetchError),
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}
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/// Result of a fetch request from a specific provider.
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#[derive(Debug)]
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pub enum FetchResult {
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/// Successful fetch from a provider.
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Fetched { from: net::SocketAddr },
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/// Error fetching the resource from a provider.
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Error {
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from: net::SocketAddr,
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error: FetchError,
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},
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}
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/// Commands sent to the protocol by the operator.
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#[derive(Debug)]
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pub enum Command {
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Connect(net::SocketAddr),
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Fetch(ProjId, chan::Sender<FetchLookup>),
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AnnounceRefsUpdate(ProjId),
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}
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/// Command-related errors.
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#[derive(thiserror::Error, Debug)]
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pub enum CommandError {}
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#[derive(Debug)]
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pub struct Protocol<S, T, G> {
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/// Peers currently or recently connected.
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peers: Peers,
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/// Protocol state that isn't peer-specific.
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context: Context<S, T, G>,
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/// Whether our local inventory no long represents what we have announced to the network.
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out_of_sync: bool,
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/// Last time the protocol was idle.
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last_idle: LocalTime,
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/// Last time the protocol synced.
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last_sync: LocalTime,
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/// Last time the protocol routing table was pruned.
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last_prune: LocalTime,
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/// Last time the protocol announced its inventory.
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last_announce: LocalTime,
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/// Time when the protocol was initialized.
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start_time: LocalTime,
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}
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impl<'r, T: WriteStorage<'r>, S: address_book::Store, G: crypto::Signer> Protocol<S, T, G> {
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pub fn new(
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config: Config,
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clock: RefClock,
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storage: T,
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addresses: S,
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signer: G,
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rng: Rng,
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) -> Self {
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let addrmgr = AddressManager::new(addresses);
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Self {
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context: Context::new(config, clock, storage, addrmgr, signer, rng.clone()),
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peers: Peers::new(rng),
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out_of_sync: false,
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last_idle: LocalTime::default(),
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last_sync: LocalTime::default(),
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last_prune: LocalTime::default(),
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last_announce: LocalTime::default(),
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start_time: LocalTime::default(),
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}
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}
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pub fn disconnect(&mut self, remote: &IpAddr, reason: DisconnectReason) {
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if let Some(addr) = self.peers.get(remote).map(|p| p.addr) {
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self.context.disconnect(addr, reason);
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}
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}
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pub fn providers(&self, proj: &ProjId) -> Box<dyn Iterator<Item = (&NodeId, &Peer)> + '_> {
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if let Some(peers) = self.routing.get(proj) {
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Box::new(
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peers
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.iter()
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.filter_map(|id| self.peers.by_id(id).map(|p| (id, p))),
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)
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} else {
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Box::new(std::iter::empty())
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}
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}
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pub fn tracked(&self) -> Result<Vec<ProjId>, storage::Error> {
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let tracked = match &self.config.project_tracking {
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ProjectTracking::All { blocked } => self
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.storage
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.inventory()?
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.into_iter()
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.filter(|id| !blocked.contains(id))
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.collect(),
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ProjectTracking::Allowed(projs) => projs.iter().cloned().collect(),
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};
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Ok(tracked)
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}
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/// Track a project.
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/// Returns whether or not the tracking policy was updated.
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pub fn track(&mut self, proj: ProjId) -> bool {
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self.out_of_sync = self.config.track(proj);
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self.out_of_sync
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}
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/// Untrack a project.
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/// Returns whether or not the tracking policy was updated.
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/// Note that when untracking, we don't announce anything to the network. This is because by
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/// simply not announcing it anymore, it will eventually be pruned by nodes.
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pub fn untrack(&mut self, proj: ProjId) -> bool {
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self.config.untrack(proj)
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}
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/// Find the closest `n` peers by proximity in tracking graphs.
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/// Returns a sorted list from the closest peer to the furthest.
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/// Peers with more trackings in common score score higher.
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#[allow(unused)]
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pub fn closest_peers(&self, n: usize) -> Vec<NodeId> {
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todo!()
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}
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/// Get the connected peers.
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pub fn peers(&self) -> &Peers {
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&self.peers
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}
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/// Get the current inventory.
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pub fn inventory(&self) -> Result<Inventory, storage::Error> {
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self.context.storage.inventory()
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}
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/// Get the storage instance.
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pub fn storage(&self) -> &T {
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&self.context.storage
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}
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/// Get the local protocol time.
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pub fn local_time(&self) -> LocalTime {
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self.context.clock.local_time()
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}
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/// Get protocol configuration.
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pub fn config(&self) -> &Config {
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&self.context.config
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}
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/// Get reference to routing table.
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pub fn routing(&self) -> &Routing {
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&self.context.routing
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}
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/// Get I/O outbox.
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pub fn outbox(&mut self) -> &mut VecDeque<Io<Event, DisconnectReason>> {
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&mut self.context.io
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}
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pub fn lookup(&self, proj: &ProjId) -> Lookup {
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Lookup {
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local: self.context.storage.get(proj).unwrap(),
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remote: self
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.context
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.routing
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.get(proj)
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.map_or(vec![], |r| r.iter().cloned().collect()),
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}
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}
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////////////////////////////////////////////////////////////////////////////
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// Periodic tasks
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////////////////////////////////////////////////////////////////////////////
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/// Announce our inventory to all connected peers.
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fn announce_inventory(&mut self) -> Result<(), storage::Error> {
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let inv = Message::inventory(&self.context)?;
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for addr in self.peers.negotiated().map(|(_, p)| p.addr) {
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self.context.write(addr, inv.clone());
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}
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Ok(())
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}
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fn get_inventories(&mut self) -> Result<(), storage::Error> {
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let mut msgs = Vec::new();
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for proj in self.tracked()? {
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for (_, peer) in self.providers(&proj) {
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if peer.is_negotiated() {
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msgs.push((
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peer.addr,
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Message::GetInventory {
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ids: vec![proj.clone()],
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},
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));
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}
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}
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}
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for (remote, msg) in msgs {
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self.write(remote, msg);
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}
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Ok(())
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}
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fn prune_routing_entries(&mut self) {
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// TODO
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}
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fn maintain_connections(&mut self) {
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// TODO: Connect to all potential providers.
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if self.peers.len() < TARGET_OUTBOUND_PEERS {
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let delta = TARGET_OUTBOUND_PEERS - self.peers.len();
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for _ in 0..delta {
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// TODO: Connect to random peer.
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}
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}
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}
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}
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impl<'r, S, T, G> nakamoto::Protocol for Protocol<S, T, G>
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where
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T: WriteStorage<'r> + 'static,
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S: address_book::Store,
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G: crypto::Signer,
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{
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type Event = Event;
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type Command = Command;
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type DisconnectReason = DisconnectReason;
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fn initialize(&mut self, time: LocalTime) {
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trace!("Init {}", time.as_secs());
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self.start_time = time;
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// Connect to configured peers.
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let addrs = self.context.config.connect.clone();
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for addr in addrs {
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self.context.connect(addr);
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}
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}
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fn tick(&mut self, now: nakamoto::LocalTime) {
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trace!("Tick +{}", now - self.start_time);
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self.context.clock.set(now);
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}
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fn wake(&mut self) {
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let now = self.context.clock.local_time();
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trace!("Wake +{}", now - self.start_time);
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if now - self.last_idle >= IDLE_INTERVAL {
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debug!("Running 'idle' task...");
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self.maintain_connections();
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self.context.io.push_back(Io::Wakeup(IDLE_INTERVAL));
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self.last_idle = now;
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}
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if now - self.last_sync >= SYNC_INTERVAL {
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debug!("Running 'sync' task...");
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self.get_inventories().unwrap();
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self.context.io.push_back(Io::Wakeup(SYNC_INTERVAL));
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self.last_sync = now;
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}
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if now - self.last_announce >= ANNOUNCE_INTERVAL {
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if self.out_of_sync {
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self.announce_inventory().unwrap();
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}
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self.context.io.push_back(Io::Wakeup(ANNOUNCE_INTERVAL));
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self.last_announce = now;
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}
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if now - self.last_prune >= PRUNE_INTERVAL {
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debug!("Running 'prune' task...");
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self.prune_routing_entries();
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self.context.io.push_back(Io::Wakeup(PRUNE_INTERVAL));
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self.last_prune = now;
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}
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}
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fn command(&mut self, cmd: Self::Command) {
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debug!("Command {:?}", cmd);
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match cmd {
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Command::Connect(addr) => self.context.connect(addr),
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Command::Fetch(proj, resp) => {
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let providers = self.providers(&proj).collect::<Vec<_>>();
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let providers = if let Some(providers) = NonEmpty::from_vec(providers) {
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providers
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} else {
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log::error!("No providers found for {}", proj);
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resp.send(FetchLookup::NotFound).ok();
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return;
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};
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log::debug!("Found {} providers for {}", providers.len(), proj);
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let mut repo = match self.storage.repository(&proj) {
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Ok(repo) => repo,
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Err(err) => {
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log::error!("Error opening repo for {}: {}", proj, err);
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resp.send(FetchLookup::Error(err.into())).ok();
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return;
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}
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};
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let (results_, results) = chan::bounded(providers.len());
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resp.send(FetchLookup::Found {
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providers: providers.clone().map(|(_, peer)| peer.addr),
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results,
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})
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.ok();
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// TODO: Limit the number of providers we fetch from? Randomize?
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for (_, peer) in providers {
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match repo.fetch(&Url {
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scheme: git_url::Scheme::Git,
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host: Some(peer.addr.ip().to_string()),
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port: Some(peer.addr.port()),
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// TODO: Fix upstream crate so that it adds a `/` when needed.
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path: format!("/{}", proj).into(),
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..Url::default()
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}) {
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Ok(()) => {
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results_.send(FetchResult::Fetched { from: peer.addr }).ok();
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}
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Err(err) => {
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results_
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.send(FetchResult::Error {
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from: peer.addr,
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error: err.into(),
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})
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.ok();
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}
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}
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}
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}
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Command::AnnounceRefsUpdate(proj) => {
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let user = *self.storage.user_id();
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let repo = self.storage.repository(&proj).unwrap();
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let remote = repo.remote(&user).unwrap();
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let peers = self.peers.negotiated().map(|(_, p)| p.addr);
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let refs = remote.refs.unverified();
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self.context
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.broadcast(Message::RefsUpdate { proj, user, refs }, peers);
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}
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}
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}
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fn attempted(&mut self, addr: &std::net::SocketAddr) {
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let ip = addr.ip();
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let persistent = self.context.config.is_persistent(addr);
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let peer = self
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.peers
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.entry(ip)
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.or_insert_with(|| Peer::new(*addr, Link::Outbound, persistent));
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peer.attempted();
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}
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fn connected(
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&mut self,
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addr: std::net::SocketAddr,
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_local_addr: &std::net::SocketAddr,
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link: Link,
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) {
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let ip = addr.ip();
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debug!("Connected to {} ({:?})", ip, link);
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// For outbound connections, we are the first to say "Hello".
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// For inbound connections, we wait for the remote to say "Hello" first.
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// TODO: How should we deal with multiple peers connecting from the same IP address?
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if link.is_outbound() {
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let git = self.config.git_url.clone();
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if let Some(peer) = self.peers.get_mut(&ip) {
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self.context.write_all(
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peer.addr,
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[
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Message::hello(
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self.context.id(),
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self.context.timestamp(),
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self.context.config.listen.clone(),
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git,
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),
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Message::get_inventory([]),
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],
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);
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peer.connected();
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}
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} else {
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self.peers.insert(
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ip,
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Peer::new(
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addr,
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Link::Inbound,
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self.context.config.is_persistent(&addr),
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),
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);
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}
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}
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fn disconnected(
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&mut self,
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addr: &std::net::SocketAddr,
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reason: nakamoto::DisconnectReason<Self::DisconnectReason>,
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) {
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let since = self.local_time();
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let ip = addr.ip();
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debug!("Disconnected from {} ({})", ip, reason);
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if let Some(peer) = self.peers.get_mut(&ip) {
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peer.state = PeerState::Disconnected { since };
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// Attempt to re-connect to persistent peers.
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if self.context.config.is_persistent(addr) && peer.attempts() < MAX_CONNECTION_ATTEMPTS
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{
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if reason.is_dial_err() {
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return;
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}
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if let nakamoto::DisconnectReason::Protocol(r) = reason {
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if !r.is_transient() {
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return;
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}
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}
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// TODO: Eventually we want a delay before attempting a reconnection,
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// with exponential back-off.
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debug!("Reconnecting to {} (attempts={})...", ip, peer.attempts());
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// TODO: Try to reconnect only if the peer was attempted. A disconnect without
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// even a successful attempt means that we're unlikely to be able to reconnect.
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self.context.connect(*addr);
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} else {
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// TODO: Non-persistent peers should be removed from the
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// map here or at some later point.
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}
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}
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}
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fn received_bytes(&mut self, addr: &std::net::SocketAddr, bytes: &[u8]) {
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let peer = addr.ip();
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let negotiated = self
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.peers
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.negotiated()
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.map(|(id, p)| (*id, p.addr))
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.collect::<Vec<_>>();
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let (peer, msgs) = if let Some(peer) = self.peers.get_mut(&peer) {
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let decoder = &mut peer.inbox();
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decoder.input(bytes);
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let mut msgs = Vec::with_capacity(1);
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loop {
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match decoder.decode_next() {
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Ok(Some(msg)) => msgs.push(msg),
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Ok(None) => break,
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Err(_err) => {
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// TODO: Disconnect peer.
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return;
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}
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}
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}
|
|
(peer, msgs)
|
|
} else {
|
|
return;
|
|
};
|
|
|
|
for msg in msgs {
|
|
match peer.received(msg, &mut self.context) {
|
|
Ok(None) => {}
|
|
Ok(Some(msg)) => {
|
|
let peers = negotiated
|
|
.iter()
|
|
.filter(|(ip, _)| *ip != peer.ip())
|
|
.map(|(_, addr)| *addr);
|
|
|
|
self.context.broadcast(msg, peers);
|
|
}
|
|
Err(err) => {
|
|
self.context
|
|
.disconnect(peer.addr, DisconnectReason::Error(err));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
impl<S, T, G> Deref for Protocol<S, T, G> {
|
|
type Target = Context<S, T, G>;
|
|
|
|
fn deref(&self) -> &Self::Target {
|
|
&self.context
|
|
}
|
|
}
|
|
|
|
impl<S, T, G> DerefMut for Protocol<S, T, G> {
|
|
fn deref_mut(&mut self) -> &mut Self::Target {
|
|
&mut self.context
|
|
}
|
|
}
|
|
|
|
#[derive(Debug, Clone)]
|
|
pub enum DisconnectReason {
|
|
User,
|
|
Error(PeerError),
|
|
}
|
|
|
|
impl DisconnectReason {
|
|
fn is_transient(&self) -> bool {
|
|
match self {
|
|
Self::User => false,
|
|
Self::Error(..) => false,
|
|
}
|
|
}
|
|
}
|
|
|
|
impl From<DisconnectReason> for nakamoto_net::DisconnectReason<DisconnectReason> {
|
|
fn from(reason: DisconnectReason) -> Self {
|
|
nakamoto_net::DisconnectReason::Protocol(reason)
|
|
}
|
|
}
|
|
|
|
impl fmt::Display for DisconnectReason {
|
|
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
|
|
match self {
|
|
Self::User => write!(f, "user"),
|
|
Self::Error(err) => write!(f, "error: {}", err),
|
|
}
|
|
}
|
|
}
|
|
|
|
impl<S, T, G> Iterator for Protocol<S, T, G> {
|
|
type Item = Io<Event, DisconnectReason>;
|
|
|
|
fn next(&mut self) -> Option<Self::Item> {
|
|
self.context.io.pop_front()
|
|
}
|
|
}
|
|
|
|
/// Result of a project lookup.
|
|
#[derive(Debug)]
|
|
pub struct Lookup {
|
|
/// Whether the project was found locally or not.
|
|
pub local: Option<Project>,
|
|
/// A list of remote peers on which the project is known to exist.
|
|
pub remote: Vec<NodeId>,
|
|
}
|
|
|
|
/// Global protocol state used across peers.
|
|
#[derive(Debug)]
|
|
pub struct Context<S, T, G> {
|
|
/// Protocol configuration.
|
|
config: Config,
|
|
/// Our cryptographic signer and key.
|
|
signer: G,
|
|
/// Tracks the location of projects.
|
|
routing: Routing,
|
|
/// Outgoing I/O queue.
|
|
io: VecDeque<Io<Event, DisconnectReason>>,
|
|
/// Clock. Tells the time.
|
|
clock: RefClock,
|
|
/// Project storage.
|
|
storage: T,
|
|
/// Peer address manager.
|
|
addrmgr: AddressManager<S>,
|
|
/// Source of entropy.
|
|
rng: Rng,
|
|
}
|
|
|
|
impl<'r, S, T, G> Context<S, T, G>
|
|
where
|
|
T: storage::WriteStorage<'r>,
|
|
G: crypto::Signer,
|
|
{
|
|
pub(crate) fn new(
|
|
config: Config,
|
|
clock: RefClock,
|
|
storage: T,
|
|
addrmgr: AddressManager<S>,
|
|
signer: G,
|
|
rng: Rng,
|
|
) -> Self {
|
|
Self {
|
|
config,
|
|
signer,
|
|
clock,
|
|
routing: HashMap::with_hasher(rng.clone().into()),
|
|
io: VecDeque::new(),
|
|
storage,
|
|
addrmgr,
|
|
rng,
|
|
}
|
|
}
|
|
|
|
pub(crate) fn id(&self) -> NodeId {
|
|
*self.signer.public_key()
|
|
}
|
|
|
|
/// Process a peer inventory announcement by updating our routing table.
|
|
fn process_inventory(&mut self, inventory: &Inventory, from: NodeId, remote: &Url) {
|
|
for proj_id in inventory {
|
|
let inventory = self
|
|
.routing
|
|
.entry(proj_id.clone())
|
|
.or_insert_with(|| HashSet::with_hasher(self.rng.clone().into()));
|
|
|
|
// TODO: Fire an event on routing update.
|
|
if inventory.insert(from) && self.config.is_tracking(proj_id) {
|
|
self.fetch(proj_id, remote);
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Process a peer inventory update announcement by (maybe) fetching.
|
|
fn process_refs_update(&mut self, proj: &ProjId, _user: &UserId, remote: &Url) -> bool {
|
|
// TODO: Check that we're tracking this user as well.
|
|
if self.config.is_tracking(proj) {
|
|
self.fetch(proj, remote);
|
|
}
|
|
// TODO: If refs were updated, return `true`.
|
|
false
|
|
}
|
|
|
|
fn fetch(&mut self, proj_id: &ProjId, remote: &Url) {
|
|
// TODO: Verify refs before adding them to storage.
|
|
let mut repo = self.storage.repository(proj_id).unwrap();
|
|
repo.fetch(&Url {
|
|
path: format!("/{}", proj_id).into(),
|
|
..remote.clone()
|
|
})
|
|
.unwrap();
|
|
}
|
|
|
|
/// Disconnect a peer.
|
|
fn disconnect(&mut self, addr: net::SocketAddr, reason: DisconnectReason) {
|
|
self.io.push_back(Io::Disconnect(addr, reason));
|
|
}
|
|
}
|
|
|
|
impl<S, T, G> Context<S, T, G> {
|
|
/// Get current local timestamp.
|
|
pub(crate) fn timestamp(&self) -> Timestamp {
|
|
self.clock.local_time().as_secs()
|
|
}
|
|
|
|
/// Connect to a peer.
|
|
fn connect(&mut self, addr: net::SocketAddr) {
|
|
// TODO: Make sure we don't try to connect more than once to the same address.
|
|
self.io.push_back(Io::Connect(addr));
|
|
}
|
|
|
|
fn write_all(&mut self, remote: net::SocketAddr, msgs: impl IntoIterator<Item = Message>) {
|
|
let mut buf = io::Cursor::new(Vec::new());
|
|
|
|
for msg in msgs {
|
|
debug!("Write {:?} to {}", &msg, remote.ip());
|
|
|
|
let envelope = self.config.network.envelope(msg);
|
|
serde_json::to_writer(&mut buf, &envelope).unwrap();
|
|
}
|
|
self.io.push_back(Io::Write(remote, buf.into_inner()));
|
|
}
|
|
|
|
fn write(&mut self, remote: net::SocketAddr, msg: Message) {
|
|
debug!("Write {:?} to {}", &msg, remote.ip());
|
|
|
|
let envelope = self.config.network.envelope(msg);
|
|
let bytes = serde_json::to_vec(&envelope).unwrap();
|
|
|
|
self.io.push_back(Io::Write(remote, bytes));
|
|
}
|
|
|
|
/// Broadcast a message to a list of peers.
|
|
fn broadcast(&mut self, msg: Message, peers: impl IntoIterator<Item = net::SocketAddr>) {
|
|
for peer in peers {
|
|
self.write(peer, msg.clone());
|
|
}
|
|
}
|
|
}
|
|
|
|
#[derive(Debug)]
|
|
/// Holds currently (or recently) connected peers.
|
|
pub struct Peers(AddressBook<IpAddr, Peer>);
|
|
|
|
impl Peers {
|
|
pub fn new(rng: Rng) -> Self {
|
|
Self(AddressBook::new(rng))
|
|
}
|
|
|
|
pub fn by_id(&self, id: &NodeId) -> Option<&Peer> {
|
|
self.0.values().find(|p| {
|
|
if let PeerState::Negotiated { id: _id, .. } = &p.state {
|
|
_id == id
|
|
} else {
|
|
false
|
|
}
|
|
})
|
|
}
|
|
|
|
/// Iterator over fully negotiated peers.
|
|
pub fn negotiated(&self) -> impl Iterator<Item = (&IpAddr, &Peer)> + Clone {
|
|
self.0.iter().filter(move |(_, p)| p.is_negotiated())
|
|
}
|
|
}
|
|
|
|
impl Deref for Peers {
|
|
type Target = AddressBook<IpAddr, Peer>;
|
|
|
|
fn deref(&self) -> &Self::Target {
|
|
&self.0
|
|
}
|
|
}
|
|
|
|
impl DerefMut for Peers {
|
|
fn deref_mut(&mut self) -> &mut Self::Target {
|
|
&mut self.0
|
|
}
|
|
}
|