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use std::net::SocketAddr;
use async_trait::async_trait;
use karyon_core::async_runtime::net::UdpSocket;
use crate::{
codec::Codec,
connection::{Conn, Connection, ToConn},
endpoint::Endpoint,
Error, Result,
};
const BUFFER_SIZE: usize = 64 * 1024;
/// UDP configuration
#[derive(Default)]
pub struct UdpConfig {}
/// UDP network connection implementation of the [`Connection`] trait.
#[allow(dead_code)]
pub struct UdpConn<C> {
inner: UdpSocket,
codec: C,
config: UdpConfig,
}
impl<C> UdpConn<C>
where
C: Codec + Clone,
{
/// Creates a new UdpConn
fn new(socket: UdpSocket, config: UdpConfig, codec: C) -> Self {
Self {
inner: socket,
codec,
config,
}
}
}
#[async_trait]
impl<C> Connection for UdpConn<C>
where
C: Codec + Clone,
{
type Item = (C::Item, Endpoint);
fn peer_endpoint(&self) -> Result<Endpoint> {
self.inner
.peer_addr()
.map(Endpoint::new_udp_addr)
.map_err(Error::from)
}
fn local_endpoint(&self) -> Result<Endpoint> {
self.inner
.local_addr()
.map(Endpoint::new_udp_addr)
.map_err(Error::from)
}
async fn recv(&self) -> Result<Self::Item> {
let mut buf = [0u8; BUFFER_SIZE];
let (_, addr) = self.inner.recv_from(&mut buf).await?;
match self.codec.decode(&mut buf)? {
Some((_, item)) => Ok((item, Endpoint::new_udp_addr(addr))),
None => Err(Error::Decode("Unable to decode".into())),
}
}
async fn send(&self, msg: Self::Item) -> Result<()> {
let (msg, out_addr) = msg;
let mut buf = [0u8; BUFFER_SIZE];
self.codec.encode(&msg, &mut buf)?;
let addr: SocketAddr = out_addr.try_into()?;
self.inner.send_to(&buf, addr).await?;
Ok(())
}
}
/// Connects to the given UDP address and port.
pub async fn dial<C>(endpoint: &Endpoint, config: UdpConfig, codec: C) -> Result<UdpConn<C>>
where
C: Codec + Clone,
{
let addr = SocketAddr::try_from(endpoint.clone())?;
// Let the operating system assign an available port to this socket
let conn = UdpSocket::bind("[::]:0").await?;
conn.connect(addr).await?;
Ok(UdpConn::new(conn, config, codec))
}
/// Listens on the given UDP address and port.
pub async fn listen<C>(endpoint: &Endpoint, config: UdpConfig, codec: C) -> Result<UdpConn<C>>
where
C: Codec + Clone,
{
let addr = SocketAddr::try_from(endpoint.clone())?;
let conn = UdpSocket::bind(addr).await?;
Ok(UdpConn::new(conn, config, codec))
}
impl<C> ToConn for UdpConn<C>
where
C: Codec + Clone,
{
type Item = (C::Item, Endpoint);
fn to_conn(self) -> Conn<Self::Item> {
Box::new(self)
}
}
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