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#![feature(async_await, specialization)]
#![recursion_limit = "512"]
mod api_client;
pub mod errors;
pub mod models;
mod subscription_client;
pub use crate::api_client::{DeribitAPICallRawResult, DeribitAPICallResult, DeribitAPIClient};
pub use crate::subscription_client::DeribitSubscriptionClient;
use crate::errors::DeribitError;
use crate::models::{Either, HeartbeatMessage, JSONRPCResponse, SubscriptionMessage, WSMessage};
use derive_builder::Builder;
use failure::Fallible;
use futures::channel::{mpsc, oneshot};
use futures::compat::{Future01CompatExt, Sink01CompatExt, Stream01CompatExt};
use futures::{select, FutureExt, SinkExt, Stream, StreamExt, TryFutureExt, TryStreamExt};
use futures01::Stream as Stream01;
use log::warn;
use log::{error, info, trace};
use serde_json::from_str;
use std::collections::HashMap;
use std::time::Duration;
use tokio::net::TcpStream;
use tokio::timer::Timeout;
use tokio_tungstenite::{connect_async, MaybeTlsStream, WebSocketStream};
use tungstenite::Message;
use url::Url;
type WSStream = WebSocketStream<MaybeTlsStream<TcpStream>>;
pub const WS_URL: &'static str = "wss://www.deribit.com/ws/api/v2";
pub const WS_URL_TESTNET: &'static str = "wss://test.deribit.com/ws/api/v2";
#[derive(Default, Builder, Debug)]
#[builder(setter(into))]
pub struct Deribit {
#[builder(default)]
testnet: bool,
#[builder(default = "10")]
subscription_buffer_size: usize,
}
impl Deribit {
pub fn new() -> Deribit {
DeribitBuilder::default().build().unwrap()
}
pub async fn connect(self) -> Fallible<(DeribitAPIClient, DeribitSubscriptionClient)> {
let ws_url = if self.testnet { WS_URL_TESTNET } else { WS_URL };
info!("Connecting");
let (ws, _) = connect_async(Url::parse(ws_url)?).compat().await?;
let (wstx, wsrx) = ws.split();
let (stx, srx) = mpsc::channel(self.subscription_buffer_size);
let (waiter_tx, waiter_rx) = mpsc::channel(10);
let background = Self::servo(wsrx.compat().err_into(), waiter_rx, stx).map_err(|e| {
warn!("[Servo] Exiting because of '{}'", e);
});
tokio::spawn(background.boxed().compat());
Ok((
DeribitAPIClient::new(wstx.sink_compat(), waiter_tx),
DeribitSubscriptionClient::new(srx),
))
}
async fn servo(
ws: impl Stream<Item = Fallible<Message>> + Unpin,
mut waiter_rx: mpsc::Receiver<(i64, oneshot::Sender<Fallible<JSONRPCResponse>>)>,
mut stx: mpsc::Sender<Either<SubscriptionMessage, HeartbeatMessage>>,
) -> Fallible<()> {
let mut ws = ws.fuse();
let mut waiters: HashMap<i64, oneshot::Sender<Fallible<JSONRPCResponse>>> = HashMap::new();
let mut orphan_messages = HashMap::new();
let (mut sdropped, mut cdropped) = (false, false);
while !sdropped && !cdropped {
select! {
msg = ws.next() => {
trace!("[Servo] Message: {:?}", msg);
if sdropped { continue; }
let msg = if let Some(msg) = msg { msg } else { Err(DeribitError::WebsocketDisconnected)? };
match msg? {
Message::Text(msg) => {
let resp: WSMessage = match from_str(&msg) {
Ok(msg) => msg,
Err(e) => {
error!("[Servo] Cannot decode rpc message {:?}", e);
Err(e)?
}
};
match resp {
WSMessage::RPC(msg) => {
let id = msg.id;
let waiter = match waiters.remove(&msg.id) {
Some(waiter) => waiter,
None => {
orphan_messages.insert(msg.id, msg);
continue;
}
};
if let Err(msg) = waiter.send(msg.to_result()) {
info!("[Servo] The client for request {} is dropped, response is {:?}", id, msg);
}
}
WSMessage::Subscription(event) => {
let fut = stx.send(Either::Left(event)).compat();
let fut = Timeout::new(fut, Duration::from_millis(1)).compat();
match fut.await.map_err(|e| e.into_inner()) {
Ok(_) => {}
Err(Some(ref e)) if e.is_disconnected() => sdropped = true,
Err(Some(e)) => { unreachable!("[Servo] futures::mpsc won't complain channel is full") },
Err(None) => { warn!("[Servo] Subscription channel is full") }
}
}
WSMessage::Heartbeat(event) => {
let fut = stx.send(Either::Right(event)).compat();
let fut = Timeout::new(fut, Duration::from_millis(1)).compat();
match fut.await.map_err(|e| e.into_inner()) {
Ok(_) => {}
Err(Some(ref e)) if e.is_disconnected() => sdropped = true,
Err(Some(e)) => { unreachable!("[Servo] futures::mpsc won't complain channel is full") },
Err(None) => { warn!("[Servo] Subscription channel is full") }
}
}
};
}
Message::Ping(_) => {
trace!("[Servo] Received Ping");
}
Message::Pong(_) => {
trace!("[Servo] Received Ping");
}
Message::Binary(_) => {
trace!("[Servo] Received Binary");
}
}
}
waiter = waiter_rx.next() => {
if let Some((id, waiter)) = waiter {
if orphan_messages.contains_key(&id) {
info!("[Servo] Message come before waiter");
let msg = orphan_messages.remove(&id).unwrap();
if let Err(msg) = waiter.send(msg.to_result()) {
info!("[Servo] The client for request {} is dropped, response is {:?}", id, msg);
}
} else {
waiters.insert(id, waiter);
}
} else {
cdropped = true;
info!("[Servo] API Client dropped");
}
}
};
}
Ok(())
}
}