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use crate::{
client::{Session, SessionChannel},
data::{Request, RequestData, ResponseData},
net::{Codec, DataStream, Transport},
server::utils::{ConnTracker, ShutdownTask},
};
use futures::stream::{Stream, StreamExt};
use log::*;
use std::{collections::HashMap, marker::Unpin, sync::Arc};
use tokio::{
io,
sync::{oneshot, Mutex},
task::{JoinError, JoinHandle},
time::Duration,
};
pub struct RelayServer {
accept_task: JoinHandle<()>,
conns: Arc<Mutex<HashMap<usize, Conn>>>,
}
impl RelayServer {
pub fn initialize<T, U, S>(
session: Session,
mut stream: S,
shutdown_after: Option<Duration>,
) -> io::Result<Self>
where
T: DataStream + Send + 'static,
U: Codec + Send + 'static,
S: Stream<Item = Transport<T, U>> + Send + Unpin + 'static,
{
let conns: Arc<Mutex<HashMap<usize, Conn>>> = Arc::new(Mutex::new(HashMap::new()));
let (shutdown, tracker) = ShutdownTask::maybe_initialize(shutdown_after);
let conns_2 = Arc::clone(&conns);
let accept_task = tokio::spawn(async move {
let inner = async move {
loop {
let channel = session.clone_channel();
match stream.next().await {
Some(transport) => {
let result = Conn::initialize(
transport,
channel,
tracker.as_ref().map(Arc::clone),
)
.await;
match result {
Ok(conn) => {
conns_2.lock().await.insert(conn.id(), conn);
}
Err(x) => {
error!("Failed to initialize connection: {}", x);
}
};
}
None => {
info!("Listener shutting down");
break;
}
};
}
};
match shutdown {
Some(shutdown) => tokio::select! {
_ = inner => {}
_ = shutdown => {
warn!("Reached shutdown timeout, so terminating");
}
},
None => inner.await,
}
});
Ok(Self { accept_task, conns })
}
pub async fn wait(self) -> Result<(), JoinError> {
self.accept_task.await
}
pub async fn abort(&self) {
self.accept_task.abort();
self.conns
.lock()
.await
.values()
.for_each(|conn| conn.abort());
}
}
struct Conn {
id: usize,
conn_task: JoinHandle<()>,
}
impl Conn {
pub async fn initialize<T, U>(
transport: Transport<T, U>,
channel: SessionChannel,
ct: Option<Arc<Mutex<ConnTracker>>>,
) -> io::Result<Self>
where
T: DataStream + 'static,
U: Codec + Send + 'static,
{
let id: usize = rand::random();
if let Some(ct) = ct.as_ref() {
ct.lock().await.increment();
}
let conn_task = spawn_conn_handler(id, transport, channel, ct).await;
Ok(Self { id, conn_task })
}
pub fn id(&self) -> usize {
self.id
}
pub fn abort(&self) {
self.conn_task.abort();
}
}
async fn spawn_conn_handler<T, U>(
conn_id: usize,
transport: Transport<T, U>,
mut channel: SessionChannel,
ct: Option<Arc<Mutex<ConnTracker>>>,
) -> JoinHandle<()>
where
T: DataStream,
U: Codec + Send + 'static,
{
let (mut t_reader, t_writer) = transport.into_split();
let processes = Arc::new(Mutex::new(Vec::new()));
let t_writer = Arc::new(Mutex::new(t_writer));
let (done_tx, done_rx) = oneshot::channel();
let mut channel_2 = channel.clone();
let processes_2 = Arc::clone(&processes);
let task = tokio::spawn(async move {
loop {
if channel_2.is_closed() {
break;
}
match t_reader.receive::<Request>().await {
Ok(Some(req)) => match channel_2.mail(req).await {
Ok(mut mailbox) => {
let processes = Arc::clone(&processes_2);
let t_writer = Arc::clone(&t_writer);
tokio::spawn(async move {
while let Some(res) = mailbox.next().await {
{
let mut p_lock = processes.lock().await;
for data in res.payload.iter() {
if let ResponseData::ProcStart { id } = *data {
p_lock.push(id);
}
}
}
if let Err(x) = t_writer.lock().await.send(res).await {
error!(
"<Conn @ {}> Failed to send response back: {}",
conn_id, x
);
}
}
});
}
Err(x) => error!(
"<Conn @ {}> Failed to pass along request received on unix socket: {:?}",
conn_id, x
),
},
Ok(None) => break,
Err(x) => {
error!(
"<Conn @ {}> Failed to receive request from unix stream: {:?}",
conn_id, x
);
break;
}
}
}
let _ = done_tx.send(());
});
tokio::spawn(async move {
let _ = done_rx.await;
let p_lock = processes.lock().await;
if !p_lock.is_empty() {
trace!(
"Cleaning conn {} :: killing {} process",
conn_id,
p_lock.len()
);
if let Err(x) = channel
.fire(Request::new(
"relay",
p_lock
.iter()
.map(|id| RequestData::ProcKill { id: *id })
.collect(),
))
.await
{
error!("<Conn @ {}> Failed to send kill signals: {}", conn_id, x);
}
}
if let Some(ct) = ct.as_ref() {
ct.lock().await.decrement();
}
debug!("<Conn @ {}> Disconnected", conn_id);
});
task
}
#[cfg(test)]
mod tests {
use super::*;
use crate::{
data::Response,
net::{InmemoryStream, PlainCodec},
};
use std::{pin::Pin, time::Duration};
use tokio::sync::mpsc;
fn make_session() -> (Transport<InmemoryStream, PlainCodec>, Session) {
let (t1, t2) = Transport::make_pair();
(t1, Session::initialize(t2).unwrap())
}
#[allow(clippy::type_complexity)]
fn make_transport_stream() -> (
mpsc::Sender<Transport<InmemoryStream, PlainCodec>>,
Pin<Box<dyn Stream<Item = Transport<InmemoryStream, PlainCodec>> + Send>>,
) {
let (tx, rx) = mpsc::channel::<Transport<InmemoryStream, PlainCodec>>(1);
let stream = futures::stream::unfold(rx, |mut rx| async move {
rx.recv().await.map(move |transport| (transport, rx))
});
(tx, Box::pin(stream))
}
#[tokio::test]
async fn wait_should_return_ok_when_all_inner_tasks_complete() {
let (transport, session) = make_session();
let (tx, stream) = make_transport_stream();
let server = RelayServer::initialize(session, stream, None).unwrap();
drop(transport);
drop(tx);
let result = server.wait().await;
assert!(result.is_ok(), "Unexpected result: {:?}", result);
}
#[tokio::test]
async fn wait_should_return_error_when_server_aborted() {
let (_transport, session) = make_session();
let (_tx, stream) = make_transport_stream();
let server = RelayServer::initialize(session, stream, None).unwrap();
server.abort().await;
match server.wait().await {
Err(x) if x.is_cancelled() => {}
x => panic!("Unexpected result: {:?}", x),
}
}
#[tokio::test]
async fn server_should_forward_requests_using_session() {
let (mut transport, session) = make_session();
let (tx, stream) = make_transport_stream();
let _server = RelayServer::initialize(session, stream, None).unwrap();
let (mut t1, t2) = Transport::make_pair();
tx.send(t2).await.unwrap();
let req = Request::new("test-tenant", vec![RequestData::SystemInfo {}]);
t1.send(req.clone()).await.unwrap();
let outbound_req = transport.receive().await.unwrap().unwrap();
assert_eq!(req, outbound_req);
}
#[tokio::test]
async fn server_should_send_back_response_with_tenant_matching_connection() {
let (mut transport, session) = make_session();
let (tx, stream) = make_transport_stream();
let _server = RelayServer::initialize(session, stream, None).unwrap();
let (mut t1, t2) = Transport::make_pair();
tx.send(t2).await.unwrap();
let (mut t2, t3) = Transport::make_pair();
tx.send(t3).await.unwrap();
t1.send(Request::new(
"test-tenant-1",
vec![RequestData::SystemInfo {}],
))
.await
.unwrap();
t2.send(Request::new(
"test-tenant-2",
vec![RequestData::SystemInfo {}],
))
.await
.unwrap();
let req_1 = transport.receive::<Request>().await.unwrap().unwrap();
let req_2 = transport.receive::<Request>().await.unwrap().unwrap();
let origin_id = if req_1.tenant == "test-tenant-2" {
req_1.id
} else {
req_2.id
};
let res = Response::new("test-tenant-2", origin_id, vec![ResponseData::Ok]);
transport.send(res.clone()).await.unwrap();
let inbound_res = t2.receive().await.unwrap().unwrap();
assert_eq!(res, inbound_res);
let no_inbound = tokio::select! {
_ = t1.receive::<Response>() => {false}
_ = tokio::time::sleep(Duration::from_millis(50)) => {true}
};
assert!(no_inbound, "Unexpectedly got response for wrong connection");
}
#[tokio::test]
async fn server_should_shutdown_if_no_connections_after_shutdown_duration() {
let (_transport, session) = make_session();
let (_tx, stream) = make_transport_stream();
let server =
RelayServer::initialize(session, stream, Some(Duration::from_millis(50))).unwrap();
let result = server.wait().await;
assert!(result.is_ok(), "Unexpected result: {:?}", result);
}
}