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|
use std::{future::Future, sync::Arc};
use log::{debug, error, info};
use karyons_core::{
async_util::{TaskGroup, TaskResult},
crypto::KeyPair,
GlobalExecutor,
};
use karyons_net::{listen, tls, Conn, Endpoint, Listener as NetListener};
use crate::{
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<'static>,
/// 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: GlobalExecutor,
) -> Arc<Self> {
Arc::new(Self {
key_pair: key_pair.clone(),
connection_slots,
task_group: TaskGroup::new(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) -> Fut + Clone + Send + 'static,
) -> Result<Endpoint>
where
Fut: Future<Output = Result<()>> + Send + 'static,
{
let listener = match self.listend(&endpoint).await {
Ok(listener) => {
self.monitor
.notify(&ConnEvent::Listening(endpoint.clone()).into())
.await;
listener
}
Err(err) => {
error!("Failed to listen on {endpoint}: {err}");
self.monitor
.notify(&ConnEvent::ListenFailed(endpoint).into())
.await;
return Err(err);
}
};
let resolved_endpoint = listener.local_endpoint()?;
info!("Start listening on {resolved_endpoint}");
let selfc = self.clone();
self.task_group
.spawn(selfc.listen_loop(listener, callback), |_| 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: Box<dyn NetListener>,
callback: impl FnOnce(Conn) -> 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(e) => e,
Err(err) => {
self.monitor.notify(&ConnEvent::AcceptFailed.into()).await;
error!("Failed to accept a new connection: {err}");
continue;
}
};
self.monitor
.notify(&ConnEvent::Accepted(endpoint.clone()).into())
.await;
(c, endpoint)
}
Err(err) => {
error!("Failed to accept a new connection: {err}");
self.monitor.notify(&ConnEvent::AcceptFailed.into()).await;
continue;
}
};
self.connection_slots.add();
let selfc = self.clone();
let on_disconnect = |res| async move {
if let TaskResult::Completed(Err(err)) = res {
debug!("Inbound connection dropped: {err}");
}
selfc
.monitor
.notify(&ConnEvent::Disconnected(endpoint).into())
.await;
selfc.connection_slots.remove().await;
};
let callback = callback.clone();
self.task_group.spawn(callback(conn), on_disconnect);
}
}
async fn listend(&self, endpoint: &Endpoint) -> Result<Box<dyn NetListener>> {
if self.enable_tls {
let tls_config = tls_server_config(&self.key_pair)?;
tls::listen(endpoint, tls_config).await
} else {
listen(endpoint).await
}
.map_err(Error::KaryonsNet)
}
}
|
