use tokio::net::UdpSocket;
use tokio_util::codec::{Decoder, Encoder};
use tokio_util::udp::UdpFramed;
use bytes::{BufMut, BytesMut};
use futures::future::try_join;
use futures::future::FutureExt;
use futures::sink::SinkExt;
use futures::stream::StreamExt;
use std::io;
#[tokio::test]
async fn send_framed() -> std::io::Result<()> {
let mut a_soc = UdpSocket::bind("127.0.0.1:0").await?;
let mut b_soc = UdpSocket::bind("127.0.0.1:0").await?;
let a_addr = a_soc.local_addr()?;
let b_addr = b_soc.local_addr()?;
{
let mut a = UdpFramed::new(a_soc, ByteCodec);
let mut b = UdpFramed::new(b_soc, ByteCodec);
let msg = b"4567".to_vec();
let send = a.send((msg.clone(), b_addr));
let recv = b.next().map(|e| e.unwrap());
let (_, received) = try_join(send, recv).await.unwrap();
let (data, addr) = received;
assert_eq!(msg, data);
assert_eq!(a_addr, addr);
a_soc = a.into_inner();
b_soc = b.into_inner();
}
{
let mut a = UdpFramed::new(a_soc, ByteCodec);
let mut b = UdpFramed::new(b_soc, ByteCodec);
let msg = b"".to_vec();
let send = a.send((msg.clone(), b_addr));
let recv = b.next().map(|e| e.unwrap());
let (_, received) = try_join(send, recv).await.unwrap();
let (data, addr) = received;
assert_eq!(msg, data);
assert_eq!(a_addr, addr);
}
Ok(())
}
pub struct ByteCodec;
impl Decoder for ByteCodec {
type Item = Vec<u8>;
type Error = io::Error;
fn decode(&mut self, buf: &mut BytesMut) -> Result<Option<Vec<u8>>, io::Error> {
let len = buf.len();
Ok(Some(buf.split_to(len).to_vec()))
}
}
impl Encoder for ByteCodec {
type Item = Vec<u8>;
type Error = io::Error;
fn encode(&mut self, data: Vec<u8>, buf: &mut BytesMut) -> Result<(), io::Error> {
buf.reserve(data.len());
buf.put_slice(&data);
Ok(())
}
}