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use futures;
use serde_json;
use std;
use tokio;
use url;
use tokio_tungstenite;
use tokio_tungstenite::tungstenite;
use events;
use {Error, Event};
use futures::{Future, Sink, Stream};
use std::sync::{Arc, Mutex};
use tokio::executor::Executor;
/// Stream of gateway events
pub struct GatewayConnection {
token: String,
url: url::Url,
state: ConnectionState,
}
enum ConnectionState {
Pending(Box<Future<Item = ConnectionState, Error = Error> + Send>),
Connected(Box<Stream<Item = Event, Error = Error> + Send>),
}
struct ReconnectInfo {
session_id: String,
last_event: u64,
}
impl GatewayConnection {
#[doc(hidden)]
pub fn connect_new(url: url::Url, token: String) -> Self {
Self {
state: ConnectionState::Pending(GatewayConnection::connect(&token, &url, None)),
url,
token,
}
}
fn connect(
token: &str,
url: &url::Url,
resume_info: Option<ReconnectInfo>,
) -> Box<Future<Item = ConnectionState, Error = Error> + Send> {
let token = token.to_owned();
Box::new(
tokio_tungstenite::connect_async(url.clone())
.map_err(|e| e.into())
.and_then(|(socket, _)| socket.into_future().map_err(|(e, _)| e.into()))
.and_then(
move |(msg1, socket)| -> Box<Future<Item = _, Error = _> + Send> {
#[derive(Deserialize)]
struct Hello {
pub heartbeat_interval: u64,
}
#[derive(Serialize)]
struct Identify<'a> {
token: &'a str,
properties: IdentifyProperties<'a>,
compress: bool,
}
#[derive(Serialize)]
struct Resume<'a> {
token: &'a str,
session_id: &'a str,
seq: u64,
}
#[derive(Serialize)]
struct IdentifyProperties<'a> {
#[serde(rename = "$os")]
os: &'a str,
#[serde(rename = "$browser")]
browser: &'a str,
#[serde(rename = "$device")]
device: &'a str,
}
if let Some(tungstenite::Message::Text(text)) = msg1 {
let payload: ::DiscordBasePayload<Hello> =
try_future_box!(serde_json::from_str(&text).map_err(|e| {
Error::Other(format!("Failed to parse hello message: {:?}", e))
}));
let first_packet = match resume_info {
Some(info) => serde_json::to_string(&::DiscordBasePayload {
op: 6,
d: Resume {
token: &token,
session_id: &info.session_id,
seq: info.last_event,
},
}),
None => {
serde_json::to_string(&::DiscordBasePayload {
op: 2,
d: Identify {
token: &token,
properties: IdentifyProperties {
os: "linux", // TODO make this work
browser: "noob",
device: "noob",
},
compress: false,
},
})
}
};
let first_packet =
try_future_box!(first_packet.map_err(|e| Error::Other(format!(
"Failed to serialize identify message: {:?}",
e
))));
Box::new(
socket
.send(tungstenite::Message::Text(first_packet))
.map_err(|e| e.into())
.map(|socket| (socket, payload.d)),
)
} else {
Box::new(futures::future::err(Error::Other(format!(
"Unexpected first message: {:?}",
msg1
))))
}
},
)
.and_then(|(socket, hello)| {
let session_info: Arc<Mutex<Option<ReconnectInfo>>> =
Arc::new(Mutex::new(None));
let (sink, stream) = socket.split();
let heartbeat_stream = tokio::timer::Interval::new(
std::time::Instant::now(),
std::time::Duration::from_millis(hello.heartbeat_interval),
);
let session_info_hb = session_info.clone();
tokio::executor::DefaultExecutor::current()
.spawn(Box::new(
sink.send_all(
heartbeat_stream
.map_err(|e| -> tungstenite::Error {
panic!("Timer error: {:?}", e);
})
.map(move |_| {
tungstenite::Message::Text(
json!({
"op": 1,
"d": match *session_info_hb.lock().unwrap() {
Some(ref info) => {
Some(info.last_event)
},
None => None
}
}).to_string(),
)
}),
).map(|_| ())
.map_err(|e| {
eprintln!("Websocket error in heartbeat stream: {:?}", e);
}),
))
.map_err(|e| {
Error::Other(format!("Failed to spawn heartbeat stream: {:?}", e))
})?;
Ok(ConnectionState::Connected(Box::new(
stream
.map_err(|e| e.into())
.filter_map(move |packet| handle_packet(&session_info, packet)),
)))
}),
)
}
}
impl Stream for GatewayConnection {
type Item = Event;
type Error = Error;
fn poll(&mut self) -> futures::Poll<Option<Self::Item>, Error> {
enum ConnPollRes {
NewState(ConnectionState),
Result(futures::Poll<Option<Event>, Error>),
}
let res =
match self.state {
ConnectionState::Pending(ref mut fut) => {
let res = fut.poll();
match res {
Ok(futures::Async::Ready(new_state)) => ConnPollRes::NewState(new_state),
Ok(futures::Async::NotReady) => {
ConnPollRes::Result(Ok(futures::Async::NotReady))
}
Err(err) => ConnPollRes::Result(Err(err)),
}
}
ConnectionState::Connected(ref mut stream) => {
let res = stream.poll();
match res {
Ok(futures::Async::Ready(None)) => {
// stream ended, reconnect
println!("reconnecting");
ConnPollRes::NewState(ConnectionState::Pending(
GatewayConnection::connect(&self.token, &self.url, None),
))
}
other => ConnPollRes::Result(other),
}
}
};
match res {
ConnPollRes::NewState(state) => {
self.state = state;
self.poll()
}
ConnPollRes::Result(res) => res,
}
}
}
fn handle_packet(
session_info: &Arc<Mutex<Option<ReconnectInfo>>>,
msg: tungstenite::Message,
) -> Option<Event> {
if let tungstenite::Message::Text(text) = msg {
#[derive(Deserialize)]
struct RecvPayload<'a> {
pub op: u8,
pub d: serde_json::Value,
pub s: Option<u64>,
pub t: Option<&'a str>,
}
match serde_json::from_str::<RecvPayload>(&text) {
Err(err) => {
eprintln!("Failed to parse packet: {:?}", err);
None
}
Ok(packet) => {
match packet.op {
0 => {
if let Some(seq) = packet.s {
if let Some(ref mut info) = *session_info.lock().unwrap() {
info.last_event = seq;
}
}
match packet.t {
Some(ref t) => handle_event(&t, packet.d),
None => {
eprintln!("Missing event type");
None
}
}
}
11 => {
// heartbeat ACK
// potentially useful, but ignored for now
None
}
op => {
eprintln!("Unrecognized packet op: {}", op);
None
}
}
}
}
} else {
eprintln!("Unexpected message type: {:?}", msg);
None
}
}
fn handle_event(t: &str, d: serde_json::Value) -> Option<Event> {
match t {
"READY" => {
let user = match serde_json::from_value(d["user"].clone()) {
Err(err) => {
eprintln!("Failed to parse ready user: {:?}", err);
return None;
}
Ok(x) => x,
};
Some(Event::Ready(events::ReadyData { user }))
}
"MESSAGE_CREATE" => match serde_json::from_value(d) {
Err(err) => {
eprintln!("Failed to parse message: {:?}", err);
None
}
Ok(data) => Some(Event::MessageCreate(data)),
},
_ => {
eprintln!("Unrecognized event type: {}", t);
None
}
}
}