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|
use std::{future::Future, sync::Arc};
use log::{debug, error, info};
use karyon_core::{
async_runtime::Executor,
async_util::{TaskGroup, TaskResult},
crypto::KeyPair,
};
use karyon_net::{tcp, tls, Conn, Endpoint};
use crate::{
codec::NetMsgCodec,
message::NetMsg,
monitor::{ConnEvent, Monitor},
slots::ConnectionSlots,
tls_config::tls_server_config,
Error, Result,
};
/// Responsible for creating inbound connections with other peers.
pub struct Listener {
/// Identity Key pair
key_pair: KeyPair,
/// Managing spawned tasks.
task_group: TaskGroup,
/// Manages available inbound slots.
connection_slots: Arc<ConnectionSlots>,
/// Enables secure connection.
enable_tls: bool,
/// Responsible for network and system monitoring.
monitor: Arc<Monitor>,
}
impl Listener {
/// Creates a new Listener
pub fn new(
key_pair: &KeyPair,
connection_slots: Arc<ConnectionSlots>,
enable_tls: bool,
monitor: Arc<Monitor>,
ex: Executor,
) -> Arc<Self> {
Arc::new(Self {
key_pair: key_pair.clone(),
connection_slots,
task_group: TaskGroup::with_executor(ex),
enable_tls,
monitor,
})
}
/// Starts a listener on the given `endpoint`. For each incoming connection
/// that is accepted, it invokes the provided `callback`, and pass the
/// connection to the callback.
///
/// Returns the resloved listening endpoint.
pub async fn start<Fut>(
self: &Arc<Self>,
endpoint: Endpoint,
// https://github.com/rust-lang/rfcs/pull/2132
callback: impl FnOnce(Conn<NetMsg>) -> Fut + Clone + Send + 'static,
) -> Result<Endpoint>
where
Fut: Future<Output = Result<()>> + Send + 'static,
{
let listener = match self.listen(&endpoint).await {
Ok(listener) => {
self.monitor
.notify(ConnEvent::Listening(endpoint.clone()))
.await;
listener
}
Err(err) => {
error!("Failed to listen on {endpoint}: {err}");
self.monitor.notify(ConnEvent::ListenFailed(endpoint)).await;
return Err(err);
}
};
let resolved_endpoint = listener.local_endpoint().map_err(Error::from)?;
info!("Start listening on {resolved_endpoint}");
self.task_group.spawn(
{
let this = self.clone();
async move { this.listen_loop(listener, callback).await }
},
|_| async {},
);
Ok(resolved_endpoint)
}
/// Shuts down the listener
pub async fn shutdown(&self) {
self.task_group.cancel().await;
}
async fn listen_loop<Fut>(
self: Arc<Self>,
listener: karyon_net::Listener<NetMsg>,
callback: impl FnOnce(Conn<NetMsg>) -> Fut + Clone + Send + 'static,
) where
Fut: Future<Output = Result<()>> + Send + 'static,
{
loop {
// Wait for an available inbound slot.
self.connection_slots.wait_for_slot().await;
let result = listener.accept().await;
let (conn, endpoint) = match result {
Ok(c) => {
let endpoint = match c.peer_endpoint() {
Ok(ep) => ep,
Err(err) => {
self.monitor.notify(ConnEvent::AcceptFailed).await;
error!("Failed to accept a new connection: {err}");
continue;
}
};
self.monitor
.notify(ConnEvent::Accepted(endpoint.clone()))
.await;
(c, endpoint)
}
Err(err) => {
error!("Failed to accept a new connection: {err}");
self.monitor.notify(ConnEvent::AcceptFailed).await;
continue;
}
};
self.connection_slots.add();
let on_disconnect = {
let this = self.clone();
|res| async move {
if let TaskResult::Completed(Err(err)) = res {
debug!("Inbound connection dropped: {err}");
}
this.monitor.notify(ConnEvent::Disconnected(endpoint)).await;
this.connection_slots.remove().await;
}
};
let callback = callback.clone();
self.task_group.spawn(callback(conn), on_disconnect);
}
}
async fn listen(&self, endpoint: &Endpoint) -> Result<karyon_net::Listener<NetMsg>> {
if self.enable_tls {
let tls_config = tls::ServerTlsConfig {
tcp_config: Default::default(),
server_config: tls_server_config(&self.key_pair)?,
};
tls::listen(endpoint, tls_config, NetMsgCodec::new())
.await
.map(|l| Box::new(l) as karyon_net::Listener<NetMsg>)
} else {
tcp::listen(endpoint, tcp::TcpConfig::default(), NetMsgCodec::new())
.await
.map(|l| Box::new(l) as karyon_net::Listener<NetMsg>)
}
.map_err(Error::KaryonNet)
}
}
|
