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use std::net::SocketAddr;
use async_trait::async_trait;
use smol::net::UdpSocket;
use crate::{
connection::Connection,
endpoint::{Addr, Endpoint, Port},
Error, Result,
};
/// UDP network connection implementation of the [`Connection`] trait.
pub struct UdpConn {
inner: UdpSocket,
}
impl UdpConn {
/// Creates a new UdpConn
pub fn new(conn: UdpSocket) -> Self {
Self { inner: conn }
}
}
impl UdpConn {
/// Receives a single datagram message. Returns the number of bytes read
/// and the origin endpoint.
pub async fn recv_from(&self, buf: &mut [u8]) -> Result<(usize, Endpoint)> {
let (size, addr) = self.inner.recv_from(buf).await?;
Ok((size, Endpoint::new_udp_addr(&addr)))
}
/// Sends data to the given address. Returns the number of bytes written.
pub async fn send_to(&self, buf: &[u8], addr: &Endpoint) -> Result<usize> {
let addr: SocketAddr = addr.clone().try_into()?;
let size = self.inner.send_to(buf, addr).await?;
Ok(size)
}
}
#[async_trait]
impl Connection for UdpConn {
fn peer_endpoint(&self) -> Result<Endpoint> {
Ok(Endpoint::new_udp_addr(&self.inner.peer_addr()?))
}
fn local_endpoint(&self) -> Result<Endpoint> {
Ok(Endpoint::new_udp_addr(&self.inner.local_addr()?))
}
async fn read(&self, buf: &mut [u8]) -> Result<usize> {
self.inner.recv(buf).await.map_err(Error::from)
}
async fn write(&self, buf: &[u8]) -> Result<usize> {
self.inner.send(buf).await.map_err(Error::from)
}
}
/// Connects to the given UDP address and port.
pub async fn dial_udp(addr: &Addr, port: &Port) -> Result<UdpConn> {
let address = format!("{}:{}", addr, port);
// Let the operating system assign an available port to this socket
let conn = UdpSocket::bind("[::]:0").await?;
conn.connect(address).await?;
Ok(UdpConn::new(conn))
}
/// Listens on the given UDP address and port.
pub async fn listen_udp(addr: &Addr, port: &Port) -> Result<UdpConn> {
let address = format!("{}:{}", addr, port);
let conn = UdpSocket::bind(address).await?;
let udp_conn = UdpConn::new(conn);
Ok(udp_conn)
}
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