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Add a mDNS network behaviour (#736)

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* Move the MdnsService to a service module

* Add a Mdns behaviour

* Add a Mdns network behaviour

* Add minor documentation

* Add minor todo

* Use nat_traversal on the observed address

* Don't add self to topology

* Automatically connect to nodes we discover

* Add Debug implementations

* Fix example
This commit is contained in:
Pierre Krieger
2018-12-10 16:00:16 +01:00
committed by GitHub
parent 460f083a0d
commit d06eb67353
7 changed files with 834 additions and 565 deletions
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75
examples/chat.rs
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@ -18,27 +18,36 @@
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//! A basic chat application demonstrating libp2p and the Floodsub protocol.
//! A basic chat application demonstrating libp2p and the mDNS and floodsub protocols.
//!
//! Using two terminal windows, start two instances. Take note of the listening
//! address of the first instance and start the second with this address as the
//! first argument. In the first terminal window, run:
//! ```text
//! cargo run --example chat
//! ```
//! It will print the PeerId and the listening address, e.g. `Listening on
//! "/ip4/0.0.0.0/tcp/24915"`
//!
//! In the second terminal window, start a new instance of the example with:
//! ```text
//! cargo run --example chat -- /ip4/127.0.0.1/tcp/24915
//! ```
//! The two nodes connect. Type a message in either terminal and hit return: the
//! Using two terminal windows, start two instances. If you local network allows mDNS,
//! they will automatically connect. Type a message in either terminal and hit return: the
//! message is sent and printed in the other terminal. Close with Ctrl-c.
//!
//! You can of course open more terminal windows and add more participants.
//! Dialing any of the other peers will propagate the new participant to all
//! chat members and everyone will receive all messages.
//!
//! # If they don't automatically connect
//!
//! If the nodes don't automatically connect, take note of the listening address of the first
//! instance and start the second with this address as the first argument. In the first terminal
//! window, run:
//!
//! ```sh
//! cargo run --example chat
//! ```
//!
//! It will print the PeerId and the listening address, e.g. `Listening on
//! "/ip4/0.0.0.0/tcp/24915"`
//!
//! In the second terminal window, start a new instance of the example with:
//!
//! ```sh
//! cargo run --example chat -- /ip4/127.0.0.1/tcp/24915
//! ```
//!
//! The two nodes then connect.
extern crate env_logger;
extern crate futures;
@ -47,7 +56,7 @@ extern crate tokio;
use futures::prelude::*;
use libp2p::{
Transport,
NetworkBehaviour, Transport,
core::upgrade::{self, OutboundUpgradeExt},
secio,
mplex,
@ -74,10 +83,32 @@ fn main() {
// Create a Floodsub topic
let floodsub_topic = libp2p::floodsub::TopicBuilder::new("chat").build();
// We create a custom network behaviour that combines floodsub and mDNS.
// In the future, we want to improve libp2p to make this easier to do.
#[derive(NetworkBehaviour)]
struct MyBehaviour<TSubstream: libp2p::tokio_io::AsyncRead + libp2p::tokio_io::AsyncWrite> {
#[behaviour(handler = "on_floodsub")]
floodsub: libp2p::floodsub::Floodsub<TSubstream>,
mdns: libp2p::mdns::Mdns<TSubstream>,
}
impl<TSubstream: libp2p::tokio_io::AsyncRead + libp2p::tokio_io::AsyncWrite> MyBehaviour<TSubstream> {
// Called when `floodsub` produces an event.
fn on_floodsub<TTopology>(&mut self, message: <libp2p::floodsub::Floodsub<TSubstream> as libp2p::core::swarm::NetworkBehaviour<TTopology>>::OutEvent)
where TSubstream: libp2p::tokio_io::AsyncRead + libp2p::tokio_io::AsyncWrite
{
println!("Received: '{:?}' from {:?}", String::from_utf8_lossy(&message.data), message.source);
}
}
// Create a Swarm to manage peers and events
let mut swarm = {
let mut behaviour = libp2p::floodsub::Floodsub::new(local_pub_key.clone().into_peer_id());
behaviour.subscribe(floodsub_topic.clone());
let mut behaviour = MyBehaviour {
floodsub: libp2p::floodsub::Floodsub::new(local_pub_key.clone().into_peer_id()),
mdns: libp2p::mdns::Mdns::new().expect("Failed to create mDNS service"),
};
behaviour.floodsub.subscribe(floodsub_topic.clone());
libp2p::Swarm::new(transport, behaviour, libp2p::core::topology::MemoryTopology::empty(), local_pub_key)
};
@ -85,7 +116,7 @@ fn main() {
let addr = libp2p::Swarm::listen_on(&mut swarm, "/ip4/0.0.0.0/tcp/0".parse().unwrap()).unwrap();
println!("Listening on {:?}", addr);
// Reach out to another node
// Reach out to another node if specified
if let Some(to_dial) = std::env::args().nth(1) {
let dialing = to_dial.clone();
match to_dial.parse() {
@ -107,7 +138,7 @@ fn main() {
tokio::run(futures::future::poll_fn(move || -> Result<_, ()> {
loop {
match framed_stdin.poll().expect("Error while polling stdin") {
Async::Ready(Some(line)) => swarm.publish(&floodsub_topic, line.as_bytes()),
Async::Ready(Some(line)) => swarm.floodsub.publish(&floodsub_topic, line.as_bytes()),
Async::Ready(None) => panic!("Stdin closed"),
Async::NotReady => break,
};
@ -115,8 +146,8 @@ fn main() {
loop {
match swarm.poll().expect("Error while polling swarm") {
Async::Ready(Some(message)) => {
println!("Received: '{:?}' from {:?}", String::from_utf8_lossy(&message.data), message.source);
Async::Ready(Some(_)) => {
},
Async::Ready(None) | Async::NotReady => break,
}