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#[cfg(feature = "axum08")]
#[cfg_attr(docsrs, doc(cfg(feature = "axum08")))]
impl axum08::serve::Listener for crate::VsockListener {
type Io = crate::VsockStream;
type Addr = vsock::VsockAddr;
async fn accept(&mut self) -> (Self::Io, Self::Addr) {
loop {
match std::future::poll_fn(|cx| self.poll_accept(cx)).await {
Ok(tuple) => return tuple,
Err(err) => handle_accept_error(err).await,
}
}
}
fn local_addr(&self) -> std::io::Result<Self::Addr> {
self.local_addr()
}
}
#[cfg(feature = "axum08")]
async fn handle_accept_error(err: std::io::Error) {
if matches!(
err.kind(),
std::io::ErrorKind::ConnectionRefused
| std::io::ErrorKind::ConnectionAborted
| std::io::ErrorKind::ConnectionReset
) {
return;
}
// [From `hyper::Server` in 0.14](https://github.com/hyperium/hyper/blob/v0.14.27/src/server/tcp.rs#L186)
//
// > A possible scenario is that the process has hit the max open files
// > allowed, and so trying to accept a new connection will fail with
// > `EMFILE`. In some cases, it's preferable to just wait for some time, if
// > the application will likely close some files (or connections), and try
// > to accept the connection again. If this option is `true`, the error
// > will be logged at the `error` level, since it is still a big deal,
// > and then the listener will sleep for 1 second.
//
// hyper allowed customizing this but axum does not.
tokio::time::sleep(std::time::Duration::from_secs(1)).await;
}