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Implement subscription::channel and simplify unfold

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Héctor Ramón Jiménez 2023-04-11 07:46:54 +02:00
parent ff24f9040c
commit ae7e6b3d48
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GPG key ID: 140CC052C94F138E
3 changed files with 121 additions and 85 deletions
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98
examples/websocket/src/echo.rs
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@ -13,63 +13,67 @@ use std::fmt;
pub fn connect() -> Subscription<Event> {
struct Connect;
subscription::unfold(
subscription::channel(
std::any::TypeId::of::<Connect>(),
State::Disconnected,
|state| async move {
match state {
State::Disconnected => {
const ECHO_SERVER: &str = "ws://localhost:3030";
100,
|mut output| async move {
let mut state = State::Disconnected;
match async_tungstenite::tokio::connect_async(ECHO_SERVER)
loop {
match &mut state {
State::Disconnected => {
const ECHO_SERVER: &str = "ws://localhost:3030";
match async_tungstenite::tokio::connect_async(
ECHO_SERVER,
)
.await
{
Ok((websocket, _)) => {
let (sender, receiver) = mpsc::channel(100);
{
Ok((websocket, _)) => {
let (sender, receiver) = mpsc::channel(100);
(
Some(Event::Connected(Connection(sender))),
State::Connected(websocket, receiver),
)
}
Err(_) => {
tokio::time::sleep(
tokio::time::Duration::from_secs(1),
)
.await;
let _ = output
.send(Event::Connected(Connection(sender)))
.await;
(Some(Event::Disconnected), State::Disconnected)
}
}
}
State::Connected(mut websocket, mut input) => {
let mut fused_websocket = websocket.by_ref().fuse();
state = State::Connected(websocket, receiver);
}
Err(_) => {
tokio::time::sleep(
tokio::time::Duration::from_secs(1),
)
.await;
futures::select! {
received = fused_websocket.select_next_some() => {
match received {
Ok(tungstenite::Message::Text(message)) => {
(
Some(Event::MessageReceived(Message::User(message))),
State::Connected(websocket, input)
)
}
Ok(_) => {
(None, State::Connected(websocket, input))
}
Err(_) => {
(Some(Event::Disconnected), State::Disconnected)
}
let _ = output.send(Event::Disconnected).await;
}
}
}
State::Connected(websocket, input) => {
let mut fused_websocket = websocket.by_ref().fuse();
message = input.select_next_some() => {
let result = websocket.send(tungstenite::Message::Text(message.to_string())).await;
futures::select! {
received = fused_websocket.select_next_some() => {
match received {
Ok(tungstenite::Message::Text(message)) => {
let _ = output.send(Event::MessageReceived(Message::User(message))).await;
}
Err(_) => {
let _ = output.send(Event::Disconnected).await;
if result.is_ok() {
(None, State::Connected(websocket, input))
} else {
(Some(Event::Disconnected), State::Disconnected)
state = State::Disconnected;
}
Ok(_) => continue,
}
}
message = input.select_next_some() => {
let result = websocket.send(tungstenite::Message::Text(message.to_string())).await;
if !result.is_ok() {
let _ = output.send(Event::Disconnected).await;
state = State::Disconnected;
}
}
}
}