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use stdweb::web::{
WebSocket,
SocketReadyState,
SocketBinaryType,
IEventTarget,
};
use stdweb::web::event::{
SocketOpenEvent,
SocketMessageEvent,
SocketCloseEvent,
SocketErrorEvent,
};
use stdweb::traits::IMessageEvent;
use format::{Text, Binary};
use callback::Callback;
use super::Task;
#[derive(Debug)]
pub enum WebSocketStatus {
Opened,
Closed,
Error,
}
#[must_use]
pub struct WebSocketTask {
ws: WebSocket,
notification: Callback<WebSocketStatus>,
}
#[derive(Default)]
pub struct WebSocketService {}
impl WebSocketService {
pub fn new() -> Self {
Self {}
}
pub fn connect<OUT: 'static>(
&mut self,
url: &str,
callback: Callback<OUT>,
notification: Callback<WebSocketStatus>,
) -> WebSocketTask
where
OUT: From<Text> + From<Binary>,
{
let ws = WebSocket::new(url).unwrap();
ws.set_binary_type(SocketBinaryType::ArrayBuffer);
let notify = notification.clone();
ws.add_event_listener(move |_: SocketOpenEvent| {
notify.emit(WebSocketStatus::Opened);
});
let notify = notification.clone();
ws.add_event_listener(move |_: SocketCloseEvent| {
notify.emit(WebSocketStatus::Closed);
});
let notify = notification.clone();
ws.add_event_listener(move |_: SocketErrorEvent| {
notify.emit(WebSocketStatus::Error);
});
ws.add_event_listener(move |event: SocketMessageEvent| {
if let Some(bytes) = event.data().into_array_buffer() {
let bytes: Vec<u8> = bytes.into();
let data = Ok(bytes);
let out = OUT::from(data);
callback.emit(out);
} else if let Some(text) = event.data().into_text() {
let data = Ok(text);
let out = OUT::from(data);
callback.emit(out);
}
});
WebSocketTask { ws, notification }
}
}
impl WebSocketTask {
pub fn send<IN>(&mut self, data: IN)
where
IN: Into<Text>,
{
if let Ok(body) = data.into() {
if let Err(_) = self.ws.send_text(&body) {
self.notification.emit(WebSocketStatus::Error);
}
}
}
pub fn send_binary<IN>(&mut self, data: IN)
where
IN: Into<Binary>,
{
if let Ok(body) = data.into() {
if let Err(_) = self.ws.send_bytes(&body) {
self.notification.emit(WebSocketStatus::Error);
}
}
}
}
impl Task for WebSocketTask {
fn is_active(&self) -> bool {
self.ws.ready_state() == SocketReadyState::Open
}
fn cancel(&mut self) {
self.ws.close();
}
}
impl Drop for WebSocketTask {
fn drop(&mut self) {
if self.is_active() {
self.cancel();
}
}
}