Add comments to Network, add mpsc

This commit is contained in:
Paul Hauner 2018-08-04 13:45:02 +10:00
parent 09822e42b6
commit e6d4f28133
2 changed files with 100 additions and 20 deletions

View File

@ -15,7 +15,7 @@ use std::path::PathBuf;
use slog::Drain;
use clap::{ Arg, App };
use p2p::config::NetworkConfig;
use p2p::service;
use p2p::service::NetworkService;
use p2p::state::NetworkState;
fn main() {
@ -58,7 +58,10 @@ fn main() {
// keys::generate_keys(&log).expect("Failed to generate keys");
} else {
let mut state = NetworkState::new(config, &log).expect("setup failed");
service::listen(state, &log);
let service = NetworkService::new(state, log.new(o!()));
service.send(vec![31, 32, 33]);
service.bg_thread.join().unwrap();
}
info!(log, "Exiting.");
}

View File

@ -23,45 +23,85 @@ extern crate tokio_stdin;
use super::state::NetworkState;
use self::bigint::U512;
use self::futures::{ Future, Stream };
use self::futures::{ Future, Stream, Poll };
use self::futures::sync::mpsc::{ unbounded, UnboundedSender, UnboundedReceiver };
use self::libp2p_core::{ AddrComponent, Endpoint, Multiaddr, Transport, ConnectionUpgrade };
use self::libp2p_kad::{ KademliaUpgrade, KademliaProcessingFuture};
use self::libp2p_identify::{ IdentifyInfo, IdentifyTransport, IdentifyOutput };
use self::slog::Logger;
use std::sync::{ Arc, RwLock };
use std::time::{ Duration, Instant };
// use std::sync::mpsc::{ channel, Sender, Receiver };
use std::thread;
use std::ops::Deref;
use std::io::Error as IoError;
use self::tokio_io::{ AsyncRead, AsyncWrite };
use self::bytes::Bytes;
pub fn listen(state: NetworkState, log: &Logger)
pub struct NetworkService {
tx: UnboundedSender<Vec<u8>>,
pub bg_thread: thread::JoinHandle<()>,
}
impl NetworkService {
pub fn new(state: NetworkState, log: Logger) -> Self {
let (tx, rx) = unbounded();
let net_rx = NetworkReciever{ inner: rx };
let bg_thread = thread::spawn(move || {
listen(state, net_rx, log);
});
Self {
tx,
bg_thread,
}
}
pub fn send(&self, msg: Vec<u8>) {
self.tx.unbounded_send(msg);
}
}
pub fn listen(state: NetworkState, rx: NetworkReciever, log: Logger)
{
let peer_store = state.peer_store;
let peer_id = state.peer_id;
let listen_multiaddr = state.listen_multiaddr;
let mut core = tokio_core::reactor::Core::new().expect("tokio failure.");
let listened_addrs = Arc::new(RwLock::new(vec![]));
// Build a tokio core
let mut core = tokio_core::reactor::Core::new().expect("tokio failure.");
// Build a base TCP libp2p transport
let transport = libp2p_tcp_transport::TcpConfig::new(core.handle())
.with_upgrade(libp2p_core::upgrade::PlainTextConfig)
.with_upgrade(libp2p_mplex::BufferedMultiplexConfig::<[_; 256]>::new())
.into_connection_reuse();
let transport_sockets = {
// Build an identify transport to allow identification and negotiation
// of layers running atop the TCP transport (e.g., kad)
let identify_transport = {
let listened_addrs = listened_addrs.clone();
let listen_multiaddr = listen_multiaddr.clone();
IdentifyTransport::new(transport.clone(), peer_store.clone())
// Managed NAT'ed connections - ensuring the external IP
// is stored not the internal addr.
.map(move |out, _, _| {
if let(Some(ref observed), ref listen_multiaddr) = (out.observed_addr, listen_multiaddr) {
if let Some(viewed_from_outside) = transport.nat_traversal(listen_multiaddr, observed) {
listened_addrs.write().unwrap().push(viewed_from_outside);
if let(Some(ref observed), ref listen_multiaddr) =
(out.observed_addr, listen_multiaddr)
{
if let Some(viewed_from_outside) =
transport.nat_traversal(listen_multiaddr, observed)
{
listened_addrs.write().unwrap()
.push(viewed_from_outside);
}
}
out.socket
})
};
// Configure and build a Kademlia upgrade to be applied
// to the base TCP transport.
let kad_config = libp2p_kad::KademliaConfig {
parallelism: 3,
record_store: (),
@ -69,19 +109,23 @@ pub fn listen(state: NetworkState, log: &Logger)
local_peer_id: peer_id.clone(),
timeout: Duration::from_secs(2)
};
let kad_ctl_proto = libp2p_kad::
KademliaControllerPrototype::new(kad_config);
let kad_upgrade = libp2p_kad::
KademliaUpgrade::from_prototype(&kad_ctl_proto);
let kad_ctl_proto = libp2p_kad::KademliaControllerPrototype::new(kad_config);
let kad_upgrade = libp2p_kad::KademliaUpgrade::from_prototype(&kad_ctl_proto);
// Combine the Kademlia and Identify upgrades into a single
// upgrader struct.
let upgrade = ConnectionUpgrader {
kad: kad_upgrade.clone(),
identify: libp2p_identify::IdentifyProtocolConfig,
};
// Build a Swarm to manage upgrading connections to peers.
let swarm_listened_addrs = listened_addrs.clone();
let swarm_peer_id = peer_id.clone();
let (swarm_ctl, swarm_future) = libp2p_core::swarm(
transport_sockets.clone().with_upgrade(upgrade),
identify_transport.clone().with_upgrade(upgrade),
move |upgrade, client_addr| match upgrade {
FinalUpgrade::Kad(kad) => Box::new(kad) as Box<_>,
FinalUpgrade::Identify(IdentifyOutput::Sender { sender, .. }) => sender.send(
@ -103,16 +147,21 @@ pub fn listen(state: NetworkState, log: &Logger)
},
);
// Start the Swarm controller listening on the local machine
let actual_addr = swarm_ctl
.listen_on(listen_multiaddr)
.expect("Failed to listen on multiaddr");
info!(log, "libp2p listening"; "listen_addr" => actual_addr.to_string());
// Convert the kad prototype into a controller by providing it the
// newly built swarm.
let (kad_ctl, kad_init) = kad_ctl_proto.start(
swarm_ctl.clone(),
transport_sockets.clone().with_upgrade(kad_upgrade.clone()));
identify_transport.clone().with_upgrade(kad_upgrade.clone()));
// Generate a tokio timer "wheel" future that sends kad FIND_NODE at
// a routine interval.
let kad_poll_log = log.new(o!());
let kad_poll = {
let polling_peer_id = peer_id.clone();
tokio_timer::wheel()
@ -125,23 +174,36 @@ pub fn listen(state: NetworkState, log: &Logger)
for peer in peers {
let peer_hash = U512::from(peer.hash());
let distance = 512 - (local_hash ^ peer_hash).leading_zeros();
info!(log, "Discovered peer";
info!(kad_poll_log, "Discovered peer";
"distance" => distance,
"peer_id" => peer.to_base58());
let peer_addr = AddrComponent::P2P(peer.into_bytes()).into();
let dial_result = swarm_ctl.dial(
peer_addr,
transport_sockets.clone().with_upgrade(kad_upgrade.clone())
identify_transport.clone().with_upgrade(kad_upgrade.clone())
);
if let Err(err) = dial_result {
warn!(log, "Dialling {:?} failed.", err)
warn!(kad_poll_log, "Dialling {:?} failed.", err)
}
}
Ok(())
})
};
let kad_send_log = log.new(o!());
let kad_send = rx.for_each(|msg| {
if let Ok(msg) = String::from_utf8(msg) {
info!(kad_send_log, "message: {:?}", msg);
}
Ok(())
});
// Generate a future featuring the kad init future
// and the kad polling cycle.
let final_future = swarm_future
.select(kad_send)
.map_err(|(err, _)| err)
.map(|((), _)| ())
.select(kad_poll)
.map_err(|(err, _)| err)
.map(|((), _)| ())
@ -152,6 +214,21 @@ pub fn listen(state: NetworkState, log: &Logger)
core.run(final_future).unwrap();
}
pub struct NetworkReciever {
inner: UnboundedReceiver<Vec<u8>>,
}
impl Stream for NetworkReciever {
type Item = Vec<u8>;
type Error = IoError;
fn poll(&mut self) -> Poll<Option<Self::Item>, Self::Error> {
self.inner
.poll()
.map_err(|_| unreachable!())
}
}
#[derive(Clone)]
struct ConnectionUpgrader<P, R> {
kad: KademliaUpgrade<P, R>,