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Insert random delays when sending and receiving websocket messages in tests

Browse Source 
Co-Authored-By: Nathan Sobo <nathan@zed.dev>
This commit is contained in:
Max Brunsfeld 2022-01-24 14:38:24 -08:00
parent d241ab6370
commit 2b8685c1a2
6 changed files with 53 additions and 21 deletions
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2
crates/client/src/test.rs
View File

@ -94,7 +94,7 @@ impl FakeServer {
Err(EstablishConnectionError::Unauthorized)?
}
let (client_conn, server_conn, _) = Connection::in_memory();
let (client_conn, server_conn, _) = Connection::in_memory(cx.background());
let (connection_id, io, incoming) = self.peer.add_connection(server_conn).await;
cx.background().spawn(io).detach();
*self.incoming.lock() = Some(incoming);

13
crates/gpui/src/executor.rs
View File

@ -5,7 +5,7 @@ use collections::HashMap;
use parking_lot::Mutex;
use postage::{barrier, prelude::Stream as _};
use rand::prelude::*;
use smol::{channel, prelude::*, Executor, Timer};
use smol::{channel, future::yield_now, prelude::*, Executor, Timer};
use std::{
any::Any,
fmt::{self, Debug, Display},
@ -528,6 +528,17 @@ impl Background {
task.await;
}
}
pub async fn simulate_random_delay(&self) {
match self {
Self::Deterministic { executor, .. } => {
if executor.state.lock().rng.gen_range(0..100) < 20 {
yield_now().await;
}
}
_ => panic!("this method can only be called on a deterministic executor"),
}
}
}
pub struct Scope<'a> {

3
crates/rpc/Cargo.toml
View File

@ -8,7 +8,7 @@ version = "0.1.0"
path = "src/rpc.rs"
[features]
test-support = []
test-support = ["gpui"]
[dependencies]
anyhow = "1.0"
@ -25,6 +25,7 @@ rsa = "0.4"
serde = { version = "1", features = ["derive"] }
smol-timeout = "0.6"
zstd = "0.9"
gpui = { path = "../gpui", features = ["test-support"], optional = true }
[build-dependencies]
prost-build = "0.8"

40
crates/rpc/src/conn.rs
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@ -34,12 +34,14 @@ impl Connection {
}
#[cfg(any(test, feature = "test-support"))]
pub fn in_memory() -> (Self, Self, postage::watch::Sender<Option<()>>) {
pub fn in_memory(
executor: std::sync::Arc<gpui::executor::Background>,
) -> (Self, Self, postage::watch::Sender<Option<()>>) {
let (kill_tx, mut kill_rx) = postage::watch::channel_with(None);
postage::stream::Stream::try_recv(&mut kill_rx).unwrap();
let (a_tx, a_rx) = Self::channel(kill_rx.clone());
let (b_tx, b_rx) = Self::channel(kill_rx);
let (a_tx, a_rx) = Self::channel(kill_rx.clone(), executor.clone());
let (b_tx, b_rx) = Self::channel(kill_rx, executor);
(
Self { tx: a_tx, rx: b_rx },
Self { tx: b_tx, rx: a_rx },
@ -50,11 +52,12 @@ impl Connection {
#[cfg(any(test, feature = "test-support"))]
fn channel(
kill_rx: postage::watch::Receiver<Option<()>>,
executor: std::sync::Arc<gpui::executor::Background>,
) -> (
Box<dyn Send + Unpin + futures::Sink<WebSocketMessage, Error = WebSocketError>>,
Box<dyn Send + Unpin + futures::Stream<Item = Result<WebSocketMessage, WebSocketError>>>,
) {
use futures::{future, SinkExt as _};
use futures::SinkExt as _;
use io::{Error, ErrorKind};
let (tx, rx) = mpsc::unbounded::<WebSocketMessage>();
@ -62,26 +65,39 @@ impl Connection {
.sink_map_err(|e| WebSocketError::from(Error::new(ErrorKind::Other, e)))
.with({
let kill_rx = kill_rx.clone();
let executor = executor.clone();
move |msg| {
if kill_rx.borrow().is_none() {
future::ready(Ok(msg))
} else {
future::ready(Err(Error::new(ErrorKind::Other, "connection killed").into()))
}
let kill_rx = kill_rx.clone();
let executor = executor.clone();
Box::pin(async move {
executor.simulate_random_delay().await;
if kill_rx.borrow().is_none() {
Ok(msg)
} else {
Err(Error::new(ErrorKind::Other, "connection killed").into())
}
})
}
});
let rx = rx.then(move |msg| {
let executor = executor.clone();
Box::pin(async move {
executor.simulate_random_delay().await;
msg
})
});
let rx = KillableReceiver { kill_rx, rx };
(Box::new(tx), Box::new(rx))
}
}
struct KillableReceiver {
rx: mpsc::UnboundedReceiver<WebSocketMessage>,
struct KillableReceiver<S> {
rx: S,
kill_rx: postage::watch::Receiver<Option<()>>,
}
impl Stream for KillableReceiver {
impl<S: Unpin + Stream<Item = WebSocketMessage>> Stream for KillableReceiver<S> {
type Item = Result<WebSocketMessage, WebSocketError>;
fn poll_next(

13
crates/rpc/src/peer.rs
View File

@ -353,12 +353,14 @@ mod tests {
let client1 = Peer::new();
let client2 = Peer::new();
let (client1_to_server_conn, server_to_client_1_conn, _) = Connection::in_memory();
let (client1_to_server_conn, server_to_client_1_conn, _) =
Connection::in_memory(cx.background());
let (client1_conn_id, io_task1, client1_incoming) =
client1.add_connection(client1_to_server_conn).await;
let (_, io_task2, server_incoming1) = server.add_connection(server_to_client_1_conn).await;
let (client2_to_server_conn, server_to_client_2_conn, _) = Connection::in_memory();
let (client2_to_server_conn, server_to_client_2_conn, _) =
Connection::in_memory(cx.background());
let (client2_conn_id, io_task3, client2_incoming) =
client2.add_connection(client2_to_server_conn).await;
let (_, io_task4, server_incoming2) = server.add_connection(server_to_client_2_conn).await;
@ -489,7 +491,8 @@ mod tests {
let server = Peer::new();
let client = Peer::new();
let (client_to_server_conn, server_to_client_conn, _) = Connection::in_memory();
let (client_to_server_conn, server_to_client_conn, _) =
Connection::in_memory(cx.background());
let (client_to_server_conn_id, io_task1, mut client_incoming) =
client.add_connection(client_to_server_conn).await;
let (server_to_client_conn_id, io_task2, mut server_incoming) =
@ -589,7 +592,7 @@ mod tests {
async fn test_disconnect(cx: TestAppContext) {
let executor = cx.foreground();
let (client_conn, mut server_conn, _) = Connection::in_memory();
let (client_conn, mut server_conn, _) = Connection::in_memory(cx.background());
let client = Peer::new();
let (connection_id, io_handler, mut incoming) = client.add_connection(client_conn).await;
@ -623,7 +626,7 @@ mod tests {
#[gpui::test(iterations = 10)]
async fn test_io_error(cx: TestAppContext) {
let executor = cx.foreground();
let (client_conn, mut server_conn, _) = Connection::in_memory();
let (client_conn, mut server_conn, _) = Connection::in_memory(cx.background());
let client = Peer::new();
let (connection_id, io_handler, mut incoming) = client.add_connection(client_conn).await;

3
crates/server/src/rpc.rs
View File

@ -3242,7 +3242,8 @@ mod tests {
"server is forbidding connections"
)))
} else {
let (client_conn, server_conn, kill_conn) = Connection::in_memory();
let (client_conn, server_conn, kill_conn) =
Connection::in_memory(cx.background());
connection_killers.lock().insert(user_id, kill_conn);
cx.background()
.spawn(server.handle_connection(