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use futures::{stream::SplitSink};
use tokio::{net::{TcpStream}, task::JoinHandle};
use tokio_tungstenite::{connect_async, tungstenite::protocol::Message, WebSocketStream, MaybeTlsStream};
use futures_util::{StreamExt, SinkExt};
#[derive(Copy, Clone)]
pub enum NotificationMessage {
SyncCipherUpdate,
SyncCipherCreate,
SyncLoginDelete,
SyncFolderDelete,
SyncCiphers,
SyncVault,
SyncOrgKeys,
SyncFolderCreate,
SyncFolderUpdate,
SyncCipherDelete,
SyncSettings,
Logout,
}
fn parse_messagepack(data: &[u8]) -> Option<NotificationMessage> {
// 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()?;
if !unpacked_messagepack.is_array() {
return None;
}
let unpacked_message = unpacked_messagepack.as_array().unwrap();
let message_type = unpacked_message.iter().next().unwrap().as_u64().unwrap();
let message = match message_type {
0 => Some(NotificationMessage::SyncCipherUpdate),
1 => Some(NotificationMessage::SyncCipherCreate),
2 => Some(NotificationMessage::SyncLoginDelete),
3 => Some(NotificationMessage::SyncFolderDelete),
4 => Some(NotificationMessage::SyncCiphers),
5 => Some(NotificationMessage::SyncVault),
6 => Some(NotificationMessage::SyncOrgKeys),
7 => Some(NotificationMessage::SyncFolderCreate),
8 => Some(NotificationMessage::SyncFolderUpdate),
9 => Some(NotificationMessage::SyncCipherDelete),
10 => Some(NotificationMessage::SyncSettings),
11 => Some(NotificationMessage::Logout),
_ => None
};
return message;
}
pub struct NotificationsHandler {
write: Option<futures::stream::SplitSink<tokio_tungstenite::WebSocketStream<tokio_tungstenite::MaybeTlsStream<tokio::net::TcpStream>>, Message>>,
read_handle: Option<tokio::task::JoinHandle<()>>,
sending_channels : std::sync::Arc<tokio::sync::RwLock<Vec<tokio::sync::mpsc::UnboundedSender<NotificationMessage>>>>,
}
impl NotificationsHandler {
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);
return 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(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<NotificationMessage> {
let (tx, rx) = tokio::sync::mpsc::unbounded_channel::<NotificationMessage>();
self.sending_channels.write().await.push(tx);
return rx;
}
}
async fn subscribe_to_notifications(url: String, sending_channels: std::sync::Arc<tokio::sync::RwLock<Vec<tokio::sync::mpsc::UnboundedSender<NotificationMessage>>>>) -> Result<(SplitSink<WebSocketStream<MaybeTlsStream<TcpStream>>, Message>, JoinHandle<()>), Box<dyn std::error::Error>> {
let url = url::Url::parse(url.as_str())?;
let (ws_stream, _response) = connect_async(url).await?;
let (mut write, read) = ws_stream.split();
write.send(Message::Text("{\"protocol\":\"messagepack\",\"version\":1}\n".to_string())).await.unwrap();
let read_future = async move {
read.map(|message| {
(message, sending_channels.clone())
}).for_each(|(message, a)| async move {
let a = a.read().await;
match message {
Ok(Message::Binary(binary)) => {
let msgpack = parse_messagepack(&binary);
if let Some(msg) = msgpack {
for channel in a.iter() {
let res = channel.send(msg);
if res.is_err() {
println!("error sending websocket message to channel");
}
}
}
},
Err(e) => {
println!("websocket error: {:?}", e);
},
_ => {}
}
}).await;
};
return Ok((write, tokio::spawn(read_future)));
}
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