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|
use futures_util::{SinkExt as _, StreamExt as _};
#[derive(Clone, Copy, Debug)]
pub enum Message {
Sync,
Logout,
}
pub struct Handler {
write: Option<
futures::stream::SplitSink<
tokio_tungstenite::WebSocketStream<
tokio_tungstenite::MaybeTlsStream<tokio::net::TcpStream>,
>,
tokio_tungstenite::tungstenite::Message,
>,
>,
read_handle: Option<tokio::task::JoinHandle<()>>,
sending_channels: std::sync::Arc<
tokio::sync::RwLock<Vec<tokio::sync::mpsc::UnboundedSender<Message>>>,
>,
}
impl Handler {
pub fn new() -> Self {
Self {
write: None,
read_handle: None,
sending_channels: std::sync::Arc::new(tokio::sync::RwLock::new(
Vec::new(),
)),
}
}
pub async fn connect(
&mut self,
url: String,
) -> Result<(), Box<dyn std::error::Error>> {
if self.is_connected() {
self.disconnect().await?;
}
let (write, read_handle) =
subscribe_to_notifications(url, self.sending_channels.clone())
.await?;
self.write = Some(write);
self.read_handle = Some(read_handle);
Ok(())
}
pub fn is_connected(&self) -> bool {
self.write.is_some()
&& self.read_handle.is_some()
&& !self.read_handle.as_ref().unwrap().is_finished()
}
pub async fn disconnect(
&mut self,
) -> Result<(), Box<dyn std::error::Error>> {
self.sending_channels.write().await.clear();
if let Some(mut write) = self.write.take() {
write
.send(tokio_tungstenite::tungstenite::Message::Close(None))
.await?;
write.close().await?;
self.read_handle.take().unwrap().await?;
}
self.write = None;
self.read_handle = None;
Ok(())
}
pub async fn get_channel(
&mut self,
) -> tokio::sync::mpsc::UnboundedReceiver<Message> {
let (tx, rx) = tokio::sync::mpsc::unbounded_channel();
self.sending_channels.write().await.push(tx);
rx
}
}
async fn subscribe_to_notifications(
url: String,
sending_channels: std::sync::Arc<
tokio::sync::RwLock<Vec<tokio::sync::mpsc::UnboundedSender<Message>>>,
>,
) -> Result<
(
futures_util::stream::SplitSink<
tokio_tungstenite::WebSocketStream<
tokio_tungstenite::MaybeTlsStream<tokio::net::TcpStream>,
>,
tokio_tungstenite::tungstenite::Message,
>,
tokio::task::JoinHandle<()>,
),
Box<dyn std::error::Error>,
> {
let url = url::Url::parse(url.as_str())?;
let (ws_stream, _response) =
tokio_tungstenite::connect_async(url).await?;
let (mut write, read) = ws_stream.split();
write
.send(tokio_tungstenite::tungstenite::Message::Text(
"{\"protocol\":\"messagepack\",\"version\":1}\x1e".to_string(),
))
.await
.unwrap();
let read_future = async move {
let sending_channels = &sending_channels;
read.for_each(|message| async move {
match message {
Ok(message) => {
if let Some(message) = parse_message(message) {
let sending_channels = sending_channels.read().await;
let sending_channels = sending_channels.as_slice();
for channel in sending_channels {
channel.send(message).unwrap();
}
}
}
Err(e) => {
eprintln!("websocket error: {e:?}");
}
}
})
.await;
};
Ok((write, tokio::spawn(read_future)))
}
fn parse_message(
message: tokio_tungstenite::tungstenite::Message,
) -> Option<Message> {
let tokio_tungstenite::tungstenite::Message::Binary(data) = message
else {
return None;
};
// the first few bytes with the 0x80 bit set, plus one byte terminating the length contain the length of the message
let len_buffer_length = data.iter().position(|&x| (x & 0x80) == 0)? + 1;
let unpacked_messagepack =
rmpv::decode::read_value(&mut &data[len_buffer_length..]).ok()?;
let unpacked_message = unpacked_messagepack.as_array()?;
let message_type = unpacked_message.first()?.as_u64()?;
// invocation
if message_type != 1 {
return None;
}
let target = unpacked_message.get(3)?.as_str()?;
if target != "ReceiveMessage" {
return None;
}
let args = unpacked_message.get(4)?.as_array()?;
let map = args.first()?.as_map()?;
for (k, v) in map {
if k.as_str()? == "Type" {
let ty = v.as_i64()?;
return match ty {
11 => Some(Message::Logout),
_ => Some(Message::Sync),
};
}
}
None
}
|
