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#![recursion_limit = "512"]
mod api_client;
pub mod errors;
mod macros;
pub mod models;
mod subscription_client;
pub use crate::{
api_client::{DeribitAPICallRawResult, DeribitAPICallResult, DeribitAPIClient},
errors::{DeribitError, Result},
subscription_client::{DeribitSubscriptionClient, DeribitSubscriptionLimitedClient},
};
use anyhow::Error;
use derive_builder::Builder;
use fehler::throws;
use futures::{
channel::{mpsc, oneshot},
select, FutureExt, SinkExt, Stream, StreamExt, TryStreamExt,
};
use lazy_static::lazy_static;
use log::{info, trace, warn};
use regex::Regex;
use std::{collections::HashMap, time::Duration};
use tokio::{net::TcpStream, time::timeout};
use tokio_tungstenite::{connect_async, MaybeTlsStream, WebSocketStream};
use tungstenite::Message;
use url::Url;
lazy_static! {
static ref RE: Regex = Regex::new(r#""jsonrpc":"2.0","id":(\d+),"#).unwrap();
}
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,
#[builder(setter(into, strip_option), default)]
timeout: Option<Duration>,
}
impl Deribit {
pub fn new() -> Deribit {
DeribitBuilder::default().build().unwrap()
}
pub fn builder() -> DeribitBuilder {
DeribitBuilder::default()
}
#[throws(Error)]
pub async fn connect(self) -> (DeribitAPIClient, DeribitSubscriptionClient) {
let ws_url = if self.testnet { WS_URL_TESTNET } else { WS_URL };
info!("Connecting");
let (ws, _) = connect_async(Url::parse(ws_url)?).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.err_into(), waiter_rx, stx)
.inspect(|r| {
if let Err(e) = r {
warn!("[Servo] Exiting because of '{}'", e)
}
})
.then(|_| async { () });
tokio::spawn(background);
(
DeribitAPIClient::new(
wstx,
waiter_tx,
self.timeout.unwrap_or(Duration::from_secs(3600)), ),
DeribitSubscriptionClient::new(srx),
)
}
#[throws(Error)]
async fn servo(
ws: impl Stream<Item = Result<Message>> + Unpin,
mut waiter_rx: mpsc::Receiver<(i64, oneshot::Sender<String>)>,
mut stx: mpsc::Sender<String>,
) {
let mut ws = ws.fuse();
let mut waiters: HashMap<i64, oneshot::Sender<String>> = 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) => {
if let Some(cap) = RE.captures(&msg) { let id_str = cap.get(1).expect("No captured group in a capture result, this cannot happen").as_str();
let id = id_str.parse().expect("Cannot parse integer while it is deemed as integer by regex, this cannot happen");
let waiter = match waiters.remove(&id) {
Some(waiter) => waiter,
None => {
orphan_messages.insert(id, msg);
continue;
}
};
if let Err(msg) = waiter.send(msg) {
info!("[Servo] Orphan response: {:?}", msg);
}
} else {
let fut = stx.send(msg);
let fut = timeout(Duration::from_millis(1),fut, );
match fut.await {
Ok(Ok(_)) => {}
Ok(Err(ref e)) if e.is_disconnected() => sdropped = true,
Ok(Err(_)) => { unreachable!("[Servo] futures::mpsc won't complain channel is full") }, Err(_) => { warn!("[Servo] Subscription channel is full") }, }
}
}
Message::Ping(_) => {
trace!("[Servo] Received Ping");
}
Message::Pong(_) => {
trace!("[Servo] Received Ping");
}
Message::Binary(_) => {
trace!("[Servo] Received Binary");
}
Message::Frame(_) => {
trace!("[Servo] Received Frame");
}
Message::Close(_) => {
trace!("[Servo] Received Close");
}
}
}
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) {
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");
}
}
};
}
info!("Servo exit with all receiver dropped");
}
}