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|
use chan;
use chan::Sender;
use rustc_serialize::json;
use std::collections::HashMap;
use std::sync::{Arc, Mutex};
use std::thread;
use ws;
use ws::{CloseCode, Handler, Handshake, Message, Sender as WsSender};
use ws::util::Token;
use datatype::{Command, Error, Event};
use super::gateway::{Gateway, Interpret};
/// The `Websocket` gateway allows connected clients to listen to `Event`s that
/// happen in the SOTA client.
pub struct Websocket {
pub server: String,
pub clients: Arc<Mutex<HashMap<Token, WsSender>>>
}
impl Gateway for Websocket {
fn initialize(&mut self, itx: Sender<Interpret>) -> Result<(), String> {
let clients = self.clients.clone();
let addr = self.server.clone();
thread::spawn(move || {
ws::listen(&addr as &str, |out| {
WebsocketHandler {
out: out,
itx: itx.clone(),
clients: clients.clone()
}
}).expect("couldn't start websocket listener");
});
Ok(info!("Websocket gateway started at {}.", self.server))
}
fn pulse(&self, event: Event) {
let json = encode(event);
for (_, out) in self.clients.lock().unwrap().iter() {
let _ = out.send(Message::Text(json.clone()));
}
}
}
pub struct WebsocketHandler {
out: WsSender,
itx: Sender<Interpret>,
clients: Arc<Mutex<HashMap<Token, WsSender>>>
}
impl Handler for WebsocketHandler {
fn on_message(&mut self, msg: Message) -> ws::Result<()> {
debug!("received websocket message: {:?}", msg);
msg.as_text().or_else(|err| {
error!("websocket on_message text error: {}", err);
Err(err)
}).and_then(|msg| match decode(msg) {
Ok(cmd) => Ok(self.forward_command(cmd)),
Err(Error::Websocket(err)) => {
error!("websocket on_message error: {}", err);
Err(err)
}
Err(err) => panic!("unexpected websocket on_message error: {}", err)
})
}
fn on_open(&mut self, _: Handshake) -> ws::Result<()> {
let _ = self.clients.lock().unwrap().insert(self.out.token(), self.out.clone());
Ok(debug!("new websocket client: {:?}", self.out.token()))
}
fn on_close(&mut self, code: CloseCode, _: &str) {
let _ = self.clients.lock().unwrap().remove(&self.out.token());
debug!("closing websocket client {:?}: {:?}", self.out.token(), code);
}
fn on_error(&mut self, err: ws::Error) {
error!("websocket error: {:?}", err);
}
}
impl WebsocketHandler {
fn forward_command(&self, cmd: Command) {
let (etx, erx) = chan::sync::<Event>(0);
let etx = Arc::new(Mutex::new(etx.clone()));
self.itx.send(Interpret { command: cmd, response_tx: Some(etx) });
let e = erx.recv().expect("websocket response_tx is closed");
let _ = self.out.send(Message::Text(encode(e)));
}
}
fn encode(event: Event) -> String {
json::encode(&event).expect("Error encoding event into JSON")
}
fn decode(s: &str) -> Result<Command, Error> {
Ok(try!(json::decode::<Command>(s)))
}
#[cfg(test)]
mod tests {
use chan;
use crossbeam;
use rustc_serialize::json;
use std::thread;
use std::collections::HashMap;
use std::sync::{Arc, Mutex};
use ws;
use ws::CloseCode;
use datatype::{Command, Event};
use gateway::{Gateway, Interpret};
use super::*;
#[test]
#[ignore] // FIXME: wait for https://github.com/housleyjk/ws-rs/issues/64
fn websocket_connections() {
let (etx, erx) = chan::sync::<Event>(0);
let (itx, irx) = chan::sync::<Interpret>(0);
thread::spawn(move || {
Websocket {
server: "localhost:3012".to_string(),
clients: Arc::new(Mutex::new(HashMap::new()))
}.start(itx, erx);
});
thread::spawn(move || {
let _ = etx; // move into this scope
loop {
let interpret = irx.recv().expect("gtx is closed");
match interpret.command {
Command::StartDownload(id) => {
let tx = interpret.response_tx.unwrap();
tx.lock().unwrap().send(Event::FoundSystemInfo(id));
}
_ => panic!("expected AcceptUpdates"),
}
}
});
crossbeam::scope(|scope| {
for id in 0..10 {
scope.spawn(move || {
ws::connect("ws://localhost:3012", |out| {
let msg = format!(r#"{{ "variant": "StartDownload", "fields": [["{}"]] }}"#, id);
out.send(msg).expect("couldn't write to websocket");
move |msg: ws::Message| {
let ev: Event = json::decode(&format!("{}", msg)).unwrap();
assert_eq!(ev, Event::FoundSystemInfo(format!("{}", id)));
out.close(CloseCode::Normal)
}
}).expect("couldn't connect to websocket");
});
}
});
}
}
|
