Rust how to handle error sending message to disconnected client - rust

Question

Good morning people! I'm starting in the Rust world and would like to ask for help.
In the code below I am simulating sending to a client that has disconnected, the program breaks when I try to send a message to a client that is no longer connected. how to treat so that the program does not break?
the match command doesn't even work
Error: Os { code: 10054, kind: ConnectionReset, message: "Forced cancellation
from an existing connection by the remote host." }
use tokio::net::UdpSocket;
use std::io;
#[tokio::main]
async fn main() -> io::Result<()> {
let sock = UdpSocket::bind("0.0.0.0:8080").await?;
let mut buf = [0; 1024];
loop {
let (len, addr) = sock.recv_from(&mut buf).await?;
println!("{:?} bytes received from {:?}", len, addr);
let len = sock.send_to(&buf[..len], addr).await?;
println!("{:?} bytes sent", len);
match sock.send_to(&buf, "127.0.0.1:23451").await
{
Result::Ok(_len) => {
println!("{:?} bytes sent", _len);
}
Result::Err(_) => {
println!("a error")
}
}
}
}
If I don't pass a valid address, I can get the error with match, but passing a valid address from a user that disconnected from the error and I can't get the match
Solution tks Guys!
use std::io;
use tokio::net::UdpSocket;
#[tokio::main]
async fn main() -> io::Result<()> {
let sock = UdpSocket::bind("0.0.0.0:8080").await?;
let mut buf = [0; 1024];
loop {
match sock.recv_from(&mut buf).await {
Result::Ok(data) => {
let (len, addr) = data;
println!("{:?} bytes received from {:?}", len, addr);
let len = sock.send_to(&buf[..len], addr).await?;
println!("{:?} bytes sent", len);
}
Result::Err(e) => {
println!("{:?}", e);
}
}
// SEND MESAGE TO USER DISCONECTED
match sock.send_to(&buf, "127.0.0.1:23451").await {
Result::Ok(_len) => {
println!("{:?} bytes sent", _len);
}
Result::Err(_) => {
println!("a error 2")
}
}
}
}

Answer 1

According to this Reddit post, it is possible the error is detected during recv_from that follows the send_to, where error is not handled.
Damnit, it was something simple, as always. So, the send operation obviously causes the error, but it was not emitted until a subsequent call to recv_from(). Thank you!
https://www.reddit.com/r/rust/comments/a2hh6n/cannot_handle_os_error_while_using_udpsocket/