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use std::{collections::VecDeque, fmt, sync::Arc};
use smol::{channel::Sender, lock::Mutex};
use karyons_core::async_utils::CondVar;
use karyons_net::Conn;
use crate::Result;
/// Defines the direction of a network connection.
#[derive(Clone, Debug)]
pub enum ConnDirection {
Inbound,
Outbound,
}
impl fmt::Display for ConnDirection {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match self {
ConnDirection::Inbound => write!(f, "Inbound"),
ConnDirection::Outbound => write!(f, "Outbound"),
}
}
}
pub struct NewConn {
pub direction: ConnDirection,
pub conn: Conn,
pub disconnect_signal: Sender<Result<()>>,
}
/// Connection queue
pub struct ConnQueue {
queue: Mutex<VecDeque<NewConn>>,
conn_available: CondVar,
}
impl ConnQueue {
pub fn new() -> Arc<Self> {
Arc::new(Self {
queue: Mutex::new(VecDeque::new()),
conn_available: CondVar::new(),
})
}
/// Push a connection into the queue and wait for the disconnect signal
pub async fn handle(&self, conn: Conn, direction: ConnDirection) -> Result<()> {
let (disconnect_signal, chan) = smol::channel::bounded(1);
let new_conn = NewConn {
direction,
conn,
disconnect_signal,
};
self.queue.lock().await.push_back(new_conn);
self.conn_available.signal();
if let Ok(result) = chan.recv().await {
return result;
}
Ok(())
}
/// Receive the next connection in the queue
pub async fn next(&self) -> NewConn {
let mut queue = self.queue.lock().await;
while queue.is_empty() {
queue = self.conn_available.wait(queue).await;
}
queue.pop_front().unwrap()
}
}
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