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use {
super::util::{NameGen, TestResult},
anyhow::Context,
futures::io::{AsyncBufReadExt, AsyncWriteExt, BufReader},
interprocess::local_socket::tokio::{LocalSocketListener, LocalSocketStream},
std::{convert::TryInto, io, sync::Arc},
tokio::{sync::oneshot::Sender, task, try_join},
};
static SERVER_MSG: &str = "Hello from server!\n";
static CLIENT_MSG: &str = "Hello from client!\n";
pub async fn server(
name_sender: Sender<String>,
num_clients: u32,
prefer_namespaced: bool,
) -> TestResult {
async fn handle_conn(conn: LocalSocketStream) -> TestResult {
let (reader, mut writer) = conn.into_split();
let mut buffer = String::with_capacity(128);
let mut reader = BufReader::new(reader);
let read = async {
reader
.read_line(&mut buffer)
.await
.context("Socket receive failed")
};
let write = async {
writer
.write_all(SERVER_MSG.as_bytes())
.await
.context("Socket send failed")
};
try_join!(read, write)?;
assert_eq!(buffer, CLIENT_MSG);
Ok(())
}
let (name, listener) = NameGen::new_auto(prefer_namespaced)
.find_map(|nm| {
let l = match LocalSocketListener::bind(&*nm) {
Ok(l) => l,
Err(e) if e.kind() == io::ErrorKind::AddrInUse => return None,
Err(e) => return Some(Err(e)),
};
Some(Ok((nm, l)))
})
.unwrap()
.context("Listener bind failed")?;
let _ = name_sender.send(name);
let mut tasks = Vec::with_capacity(num_clients.try_into().unwrap());
for _ in 0..num_clients {
let conn = match listener.accept().await {
Ok(c) => c,
Err(e) => {
eprintln!("Incoming connection failed: {}", e);
continue;
}
};
tasks.push(task::spawn(handle_conn(conn)));
}
for task in tasks {
task.await
.context("Server task panicked")?
.context("Server task returned early with error")?;
}
Ok(())
}
pub async fn client(name: Arc<String>) -> TestResult {
let mut buffer = String::with_capacity(128);
let (reader, mut writer) = LocalSocketStream::connect(name.as_str())
.await
.context("Connect failed")?
.into_split();
let mut reader = BufReader::new(reader);
let read = async {
reader
.read_line(&mut buffer)
.await
.context("Socket receive failed")
};
let write = async {
writer
.write_all(CLIENT_MSG.as_bytes())
.await
.context("Socket send failed")
};
try_join!(read, write)?;
assert_eq!(buffer, SERVER_MSG);
Ok(())
}
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