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vm-virtio: Retry connections to vhost-user backends

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If the connection to the backend fails, sleep and retry up to a count.
This failure could happen because the backend is not yet ready to handle
the connection which is a common case when working with a spawned
backend.

Signed-off-by: Rob Bradford <robert.bradford@intel.com>
This commit is contained in:
Rob Bradford 2020-02-04 16:41:05 +00:00
parent b04eb4770b
commit d054dddcb3
1 changed files with 22 additions and 4 deletions
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26
vhost_rs/src/vhost_user/master.rs
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@ -85,13 +85,31 @@ impl Master {
/// Create a new vhost-user master endpoint.
///
/// Will retry as the backend may not be ready to accept the connection.
///
/// # Arguments
/// * `path` - path of Unix domain socket listener to connect to
pub fn connect(path: &str, max_queue_num: u64) -> Result<Self> {
Ok(Self::new(
Endpoint::<MasterReq>::connect(path)?,
max_queue_num,
))
let mut retry_count = 5;
let endpoint = loop {
match Endpoint::<MasterReq>::connect(path) {
Ok(endpoint) => break Ok(endpoint),
Err(e) => match &e {
VhostUserError::SocketConnect(why) => {
if why.kind() == std::io::ErrorKind::ConnectionRefused && retry_count > 0 {
std::thread::sleep(std::time::Duration::from_millis(100));
retry_count -= 1;
continue;
} else {
break Err(e);
}
}
_ => break Err(e),
},
}
}?;
Ok(Self::new(endpoint, max_queue_num))
}
}