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use std::future::Future;
use std::pin::Pin;
use std::str::FromStr;
use async_graphql::http::{WebSocket as AGWebSocket, WebSocketProtocols, WsMessage};
use async_graphql::{Data, ObjectType, Result, Schema, SubscriptionType};
use futures_util::{future, StreamExt};
use tide::{Endpoint, Request, Response};
use tide_websockets::Message;
pub struct Subscription<S> {
inner: Pin<Box<dyn Endpoint<S>>>,
}
#[async_trait::async_trait]
impl<S> Endpoint<S> for Subscription<S>
where
S: Send + Sync + Clone + 'static,
{
async fn call(&self, req: Request<S>) -> tide::Result<Response> {
self.inner.call(req).await
}
}
impl<S> Subscription<S>
where
S: Send + Sync + Clone + 'static,
{
pub fn new<Query, Mutation, Subscription>(schema: Schema<Query, Mutation, Subscription>) -> Self
where
Query: ObjectType + 'static,
Mutation: ObjectType + 'static,
Subscription: SubscriptionType + 'static,
{
Self::new_with_initializer(schema, |_| {
futures_util::future::ready(Ok(Default::default()))
})
}
pub fn new_with_initializer<Query, Mutation, Subscription, F, R>(
schema: Schema<Query, Mutation, Subscription>,
initializer: F,
) -> Self
where
Query: ObjectType + 'static,
Mutation: ObjectType + 'static,
Subscription: SubscriptionType + 'static,
F: FnOnce(serde_json::Value) -> R + Unpin + Send + Sync + Clone + 'static,
R: Future<Output = Result<Data>> + Send + 'static,
{
let endpoint = tide_websockets::WebSocket::<S, _>::new(move |request, connection| {
let schema = schema.clone();
let initializer = initializer.clone();
async move {
let protocol = match request
.header("sec-websocket-protocol")
.map(|value| value.as_str())
.and_then(|protocols| {
protocols
.split(',')
.find_map(|p| WebSocketProtocols::from_str(p.trim()).ok())
}) {
Some(protocol) => protocol,
None => {
WebSocketProtocols::SubscriptionsTransportWS
}
};
let sink = connection.clone();
let mut stream = AGWebSocket::with_data(
schema.clone(),
connection
.take_while(|msg| future::ready(msg.is_ok()))
.map(Result::unwrap)
.map(Message::into_data),
initializer,
protocol,
);
while let Some(data) = stream.next().await {
match data {
WsMessage::Text(text) => {
if sink.send_string(text).await.is_err() {
break;
}
}
WsMessage::Close(_code, _msg) => {
break;
}
}
}
Ok(())
}
})
.with_protocols(&["graphql-transport-ws", "graphql-ws"]);
Self {
inner: Box::pin(endpoint),
}
}
}