cross_ws/backend/switch/
tungstenite.rs

1//! tungstenite WebSocket backend.
2
3use crate::prelude::*;
4use crate::error::WebsocketResult;
5use tokio_tungstenite::{connect_async, WebSocketStream, MaybeTlsStream};
6
7/// Backend error type.
8pub type BackendError = tokio_tungstenite::tungstenite::Error;
9use tokio::net::TcpStream;
10use futures_util::SinkExt;
11use std::sync::{Arc, Mutex};
12
13use crate::message::Message;
14use futures_util::StreamExt;
15// use tokio_tungstenite::tungstenite::protocol::CloseFrame;
16// use tokio_tungstenite::tungstenite::protocol::frame::coding::CloseCode;
17use futures_util::stream::{SplitSink, SplitStream};
18
19impl From<tokio_tungstenite::tungstenite::Message> for Message {
20    fn from(message: tokio_tungstenite::tungstenite::Message) -> Self {
21        match message {
22            tokio_tungstenite::tungstenite::Message::Binary(binary) => {
23                Message::Binary(binary.into())
24            },
25            tokio_tungstenite::tungstenite::Message::Text(text) => {
26                Message::Text(text.as_str().into())
27            },
28            tokio_tungstenite::tungstenite::Message::Close(close) => {
29                let close = close.map(|close| close.reason.to_string());
30                Message::Close(close)
31            },
32            _ => unimplemented!("Some message types aren't implemented yet: {:#?}", message)
33        }
34    }
35}
36
37/// Stream-based WebSocket.
38#[derive(Derivative)]
39#[derivative(Debug)]
40pub struct WebSocket {}
41
42/// WebSocket sender. Also responsible for closing the connection.
43#[derive(Derivative, Clone)]
44#[derivative(Debug)]
45pub struct WebSocketSender {
46    #[derivative(Debug="ignore")]
47    sender: Arc<Mutex<SplitSink<WebSocketStream<MaybeTlsStream<TcpStream>>, tokio_tungstenite::tungstenite::Message>>>
48}
49
50/// Stream-based WebSocket receiver.
51#[derive(Derivative)]
52#[derivative(Debug)]
53pub struct WebSocketReceiver {
54    #[derivative(Debug="ignore")]
55    receiver: SplitStream<WebSocketStream<MaybeTlsStream<TcpStream>>>
56}
57
58impl WebSocket {
59    /// Creates a new WebSocket and connects it to the specified `url`.
60    /// Returns `ConnectionError` if it can't connect.
61    pub async fn new(url: &str) -> WebsocketResult<(WebSocketSender, WebSocketReceiver)> {
62        connect_async(url)
63            .await
64            .map(|(socket, _response)| {
65                let (sender, receiver) = socket.split();
66                let sender = Arc::new(Mutex::new(sender));
67                (WebSocketSender { sender }, WebSocketReceiver { receiver })
68            })
69            .map_err(|error| crate::error::Error::ConnectionError(error))
70    }
71}
72
73impl WebSocketSender {
74    /// Attempts to send a message and returns `SendError` if it fails.
75    pub async fn send(&mut self, message: &Message) -> WebsocketResult<()> {
76        match message {
77            Message::Text(text) => {
78                let text = text.clone().into();
79                self.sender.lock().expect("Failed to lock sender.").send(text).await.map_err(|error| crate::error::Error::SendError(error))
80            },
81            Message::Binary(binary) => {
82                let binary = binary.clone().into();
83                self.sender.lock().expect("Failed to lock sender.").send(binary).await.map_err(|error| crate::error::Error::SendError(error))
84            },
85            Message::Close(_close) => {
86                self.sender.lock().expect("Failed to lock sender.").close().await.map_err(|error| crate::error::Error::SendError(error))
87            }
88        }
89    }
90
91    /// Attempts to close the connection and returns `SendError` if it fails.
92    pub async fn close(&mut self, message: Option<String>) -> WebsocketResult<()> {
93        self.send(&Message::Close(message)).await
94    }
95}
96
97impl WebSocketReceiver {
98    /// Attempts to receive a message and returns `ReceiveError` if it fails.
99    pub async fn next(&mut self) -> Option<WebsocketResult<Message>> {
100        self.receiver.next().await.map(|result| {
101            result
102                .map(|result| {
103                    result.into()
104                })
105                .map_err(|error| {
106                    crate::error::Error::ReceiveError(error)
107                })
108        })
109    }
110}
cross_ws/backend/switch/tungstenite.rs

cross_ws/backend/switch/
tungstenite.rs
