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use std::{convert::TryInto, net::SocketAddr, time::Duration};
use config::Config;
use encoding::message::Header;
use encoding::{message::Message, payload::BroadcastPayload};
use handling::MessageHandler;
pub use handling::MessageInfo;
use itertools::Itertools;
use kbucket::Tree;
use mantainer::TableMantainer;
use peer::{PeerInfo, PeerNode};
use rand::prelude::IteratorRandom;
pub(crate) use rwlock::RwLock;
use tokio::sync::mpsc::{self, Receiver, Sender};
use tokio::task;
use tracing::{error, info};
use transport::{MessageBeanOut, WireNetwork};
pub mod config;
mod encoding;
mod handling;
mod kbucket;
mod mantainer;
mod peer;
mod rwlock;
pub mod transport;
const DEFAULT_K_K: usize = 20;
const K_K: usize = get_k_k();
const K_ID_LEN_BYTES: usize = 16;
const K_NONCE_LEN: usize = 4;
const K_DIFF_MIN_BIT: usize = 8;
const K_DIFF_PRODUCED_BIT: usize = 8;
const fn get_k_k() -> usize {
match option_env!("KADCAST_K") {
Some(v) => match konst::primitive::parse_usize(v) {
Ok(e) => e,
Err(_) => DEFAULT_K_K,
},
None => DEFAULT_K_K,
}
}
const K_ALPHA: usize = 3;
const K_BETA: usize = 3;
pub struct Peer {
outbound_sender: Sender<MessageBeanOut>,
ktable: RwLock<Tree<PeerInfo>>,
header: Header,
}
pub trait NetworkListen: Send {
fn on_message(&self, message: Vec<u8>, metadata: MessageInfo);
}
impl Peer {
pub fn new<L: NetworkListen + 'static>(
config: Config,
listener: L,
) -> Self {
let tree = Tree::new(
PeerNode::from_address(&config.public_address[..]),
config.bucket,
);
let (inbound_channel_tx, inbound_channel_rx) =
mpsc::channel(config.channel_size);
let (outbound_channel_tx, outbound_channel_rx) =
mpsc::channel(config.channel_size);
let (notification_channel_tx, listener_channel_rx) =
mpsc::channel(config.channel_size);
let header = tree.root().as_header();
let table = RwLock::new(tree, Duration::from_secs(1));
let peer = Peer {
outbound_sender: outbound_channel_tx.clone(),
ktable: table.clone(),
header,
};
let bootstrapping_nodes = config.bootstrapping_nodes.clone();
MessageHandler::start(
table.clone(),
inbound_channel_rx,
outbound_channel_tx.clone(),
notification_channel_tx,
&config,
);
WireNetwork::start(inbound_channel_tx, outbound_channel_rx, config);
tokio::spawn(TableMantainer::start(
bootstrapping_nodes,
table,
outbound_channel_tx,
));
task::spawn(Peer::notifier(listener_channel_rx, listener));
peer
}
async fn notifier(
mut listener_channel_rx: Receiver<(Vec<u8>, MessageInfo)>,
listener: impl NetworkListen,
) {
while let Some(notif) = listener_channel_rx.recv().await {
listener.on_message(notif.0, notif.1);
}
}
pub async fn alive_nodes(&self, amount: usize) -> Vec<SocketAddr> {
let table_read = self.ktable.read().await;
let rng = &mut rand::thread_rng();
table_read
.alive_nodes()
.map(|i| i.as_peer_info().to_socket_address())
.choose_multiple(rng, amount)
}
#[doc(hidden)]
pub async fn report(&self) {
let table_read = self.ktable.read().await;
table_read.all_sorted().for_each(|(h, nodes)| {
let nodes_joined = nodes.map(|p| p.value().address()).join(",");
info!("H: {} - Nodes {}", h, nodes_joined);
});
}
pub async fn broadcast(&self, message: &[u8], height: Option<usize>) {
if message.is_empty() {
error!("Message empty");
return;
}
let tosend: Vec<(Message, Vec<SocketAddr>)> = self
.ktable
.read()
.await
.extract(height)
.map(|(h, nodes)| {
let msg = Message::Broadcast(
self.header,
BroadcastPayload {
height: h.try_into().unwrap(),
gossip_frame: message.to_vec(),
},
);
let targets: Vec<SocketAddr> =
nodes.map(|node| *node.value().address()).collect();
(msg, targets)
})
.collect();
for i in tosend {
self.outbound_sender.send(i).await.unwrap_or_else(|e| {
error!("Unable to send from broadcast {}", e)
});
}
}
pub async fn send(&self, message: &[u8], target: SocketAddr) {
if message.is_empty() {
return;
}
let msg = Message::Broadcast(
self.header,
BroadcastPayload {
height: 0,
gossip_frame: message.to_vec(),
},
);
let targets = vec![target];
self.outbound_sender
.send((msg, targets))
.await
.unwrap_or_else(|e| {
error!("Unable to send from send method {}", e)
});
}
}