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use std::{io::Error as IoError, str::FromStr};
use async_graphql::{
http::{WebSocketProtocols, WsMessage, ALL_WEBSOCKET_PROTOCOLS},
Data, ObjectType, Schema, SubscriptionType,
};
use futures_util::{
future::{self, Ready},
stream::{SplitSink, SplitStream},
Future, Sink, SinkExt, Stream, StreamExt,
};
use poem::{
http,
http::StatusCode,
web::websocket::{Message, WebSocket},
Endpoint, Error, FromRequest, IntoResponse, Request, RequestBody, Response, Result,
};
#[derive(Debug, Copy, Clone, PartialEq, Eq)]
pub struct GraphQLProtocol(pub WebSocketProtocols);
#[poem::async_trait]
impl<'a> FromRequest<'a> for GraphQLProtocol {
async fn from_request(req: &'a Request, _body: &mut RequestBody) -> Result<Self> {
req.headers()
.get(http::header::SEC_WEBSOCKET_PROTOCOL)
.and_then(|value| value.to_str().ok())
.and_then(|protocols| {
protocols
.split(',')
.find_map(|p| WebSocketProtocols::from_str(p.trim()).ok())
})
.map(Self)
.ok_or_else(|| Error::from_status(StatusCode::BAD_REQUEST))
}
}
pub struct GraphQLSubscription<Query, Mutation, Subscription> {
schema: Schema<Query, Mutation, Subscription>,
}
impl<Query, Mutation, Subscription> GraphQLSubscription<Query, Mutation, Subscription> {
pub fn new(schema: Schema<Query, Mutation, Subscription>) -> Self {
Self { schema }
}
}
#[poem::async_trait]
impl<Query, Mutation, Subscription> Endpoint for GraphQLSubscription<Query, Mutation, Subscription>
where
Query: ObjectType + 'static,
Mutation: ObjectType + 'static,
Subscription: SubscriptionType + 'static,
{
type Output = Response;
async fn call(&self, req: Request) -> Result<Self::Output> {
let (req, mut body) = req.split();
let websocket = WebSocket::from_request(&req, &mut body).await?;
let protocol = GraphQLProtocol::from_request(&req, &mut body).await?;
let schema = self.schema.clone();
let resp = websocket
.protocols(ALL_WEBSOCKET_PROTOCOLS)
.on_upgrade(move |stream| GraphQLWebSocket::new(stream, schema, protocol).serve())
.into_response();
Ok(resp)
}
}
type DefaultOnConnInitType = fn(serde_json::Value) -> Ready<async_graphql::Result<Data>>;
fn default_on_connection_init(_: serde_json::Value) -> Ready<async_graphql::Result<Data>> {
futures_util::future::ready(Ok(Data::default()))
}
pub struct GraphQLWebSocket<Sink, Stream, Query, Mutation, Subscription, OnConnInit> {
sink: Sink,
stream: Stream,
schema: Schema<Query, Mutation, Subscription>,
data: Data,
on_connection_init: OnConnInit,
protocol: GraphQLProtocol,
}
impl<S, Query, Mutation, Subscription>
GraphQLWebSocket<
SplitSink<S, Message>,
SplitStream<S>,
Query,
Mutation,
Subscription,
DefaultOnConnInitType,
>
where
S: Stream<Item = Result<Message, IoError>> + Sink<Message>,
Query: ObjectType + 'static,
Mutation: ObjectType + 'static,
Subscription: SubscriptionType + 'static,
{
pub fn new(
stream: S,
schema: Schema<Query, Mutation, Subscription>,
protocol: GraphQLProtocol,
) -> Self {
let (sink, stream) = stream.split();
GraphQLWebSocket::new_with_pair(sink, stream, schema, protocol)
}
}
impl<Sink, Stream, Query, Mutation, Subscription>
GraphQLWebSocket<Sink, Stream, Query, Mutation, Subscription, DefaultOnConnInitType>
where
Sink: futures_util::sink::Sink<Message>,
Stream: futures_util::stream::Stream<Item = Result<Message, IoError>>,
Query: ObjectType + 'static,
Mutation: ObjectType + 'static,
Subscription: SubscriptionType + 'static,
{
pub fn new_with_pair(
sink: Sink,
stream: Stream,
schema: Schema<Query, Mutation, Subscription>,
protocol: GraphQLProtocol,
) -> Self {
GraphQLWebSocket {
sink,
stream,
schema,
data: Data::default(),
on_connection_init: default_on_connection_init,
protocol,
}
}
}
impl<Sink, Stream, Query, Mutation, Subscription, OnConnInit, OnConnInitFut>
GraphQLWebSocket<Sink, Stream, Query, Mutation, Subscription, OnConnInit>
where
Sink: futures_util::sink::Sink<Message>,
Stream: futures_util::stream::Stream<Item = Result<Message, IoError>>,
Query: ObjectType + 'static,
Mutation: ObjectType + 'static,
Subscription: SubscriptionType + 'static,
OnConnInit: Fn(serde_json::Value) -> OnConnInitFut + Send + Sync + 'static,
OnConnInitFut: Future<Output = async_graphql::Result<Data>> + Send + 'static,
{
#[must_use]
pub fn with_data(self, data: Data) -> Self {
Self { data, ..self }
}
pub fn on_connection_init<OnConnInit2, Fut>(
self,
callback: OnConnInit2,
) -> GraphQLWebSocket<Sink, Stream, Query, Mutation, Subscription, OnConnInit2>
where
OnConnInit2: Fn(serde_json::Value) -> Fut + Send + Sync + 'static,
Fut: Future<Output = async_graphql::Result<Data>> + Send + 'static,
{
GraphQLWebSocket {
sink: self.sink,
stream: self.stream,
schema: self.schema,
data: self.data,
on_connection_init: callback,
protocol: self.protocol,
}
}
pub async fn serve(self) {
let stream = self
.stream
.take_while(|res| future::ready(res.is_ok()))
.map(Result::unwrap)
.filter_map(|msg| {
if msg.is_text() || msg.is_binary() {
future::ready(Some(msg))
} else {
future::ready(None)
}
})
.map(Message::into_bytes);
let stream =
async_graphql::http::WebSocket::new(self.schema.clone(), stream, self.protocol.0)
.connection_data(self.data)
.on_connection_init(self.on_connection_init)
.map(|msg| match msg {
WsMessage::Text(text) => Message::text(text),
WsMessage::Close(code, status) => Message::close_with(code, status),
});
let sink = self.sink;
futures_util::pin_mut!(stream, sink);
while let Some(item) = stream.next().await {
let _ = sink.send(item).await;
}
}
}