126 lines
4.8 KiB
Rust
126 lines
4.8 KiB
Rust
use std::{future::Future, str::FromStr};
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use async_graphql::{
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http::{WebSocket as AGWebSocket, WebSocketProtocols, WsMessage, ALL_WEBSOCKET_PROTOCOLS},
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Data, ObjectType, Result, Schema, SubscriptionType,
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};
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use futures_util::{future, future::Ready, StreamExt};
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use tide::Endpoint;
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use tide_websockets::{tungstenite::protocol::CloseFrame, Message};
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/// A GraphQL subscription endpoint builder.
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#[cfg_attr(docsrs, doc(cfg(feature = "websocket")))]
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pub struct GraphQLSubscription<Query, Mutation, Subscription, OnConnInit> {
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schema: Schema<Query, Mutation, Subscription>,
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on_connection_init: OnConnInit,
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}
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type DefaultOnConnInitType = fn(serde_json::Value) -> Ready<async_graphql::Result<Data>>;
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fn default_on_connection_init(_: serde_json::Value) -> Ready<async_graphql::Result<Data>> {
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futures_util::future::ready(Ok(Data::default()))
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}
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impl<Query, Mutation, Subscription>
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GraphQLSubscription<Query, Mutation, Subscription, DefaultOnConnInitType>
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where
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Query: ObjectType + 'static,
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Mutation: ObjectType + 'static,
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Subscription: SubscriptionType + 'static,
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{
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/// Create a [`GraphQLSubscription`] object.
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pub fn new(schema: Schema<Query, Mutation, Subscription>) -> Self {
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GraphQLSubscription {
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schema,
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on_connection_init: default_on_connection_init,
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}
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}
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}
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impl<Query, Mutation, Subscription, OnConnInit, OnConnInitFut>
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GraphQLSubscription<Query, Mutation, Subscription, OnConnInit>
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where
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Query: ObjectType + 'static,
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Mutation: ObjectType + 'static,
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Subscription: SubscriptionType + 'static,
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OnConnInit: Fn(serde_json::Value) -> OnConnInitFut + Clone + Send + Sync + 'static,
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OnConnInitFut: Future<Output = async_graphql::Result<Data>> + Send + 'static,
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{
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/// Specify a callback function to be called when the connection is
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/// initialized.
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///
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/// You can get something from the payload of [`GQL_CONNECTION_INIT` message](https://github.com/apollographql/subscriptions-transport-ws/blob/master/PROTOCOL.md#gql_connection_init) to create [`Data`].
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/// The data returned by this callback function will be merged with the data
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/// specified by [`with_data`].
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pub fn on_connection_init<OnConnInit2, Fut>(
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self,
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callback: OnConnInit2,
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) -> GraphQLSubscription<Query, Mutation, Subscription, OnConnInit2>
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where
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OnConnInit2: Fn(serde_json::Value) -> Fut + Clone + Send + Sync + 'static,
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Fut: Future<Output = async_graphql::Result<Data>> + Send + 'static,
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{
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GraphQLSubscription {
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schema: self.schema,
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on_connection_init: callback,
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}
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}
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/// Consumes this builder to create a tide endpoint.
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pub fn build<S: Send + Sync + Clone + 'static>(self) -> impl Endpoint<S> {
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tide_websockets::WebSocket::<S, _>::new(move |request, connection| {
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let schema = self.schema.clone();
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let on_connection_init = self.on_connection_init.clone();
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async move {
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let protocol = match request
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.header("sec-websocket-protocol")
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.map(|value| value.as_str())
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.and_then(|protocols| {
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protocols
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.split(',')
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.find_map(|p| WebSocketProtocols::from_str(p.trim()).ok())
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}) {
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Some(protocol) => protocol,
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None => {
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// default to the prior standard
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WebSocketProtocols::SubscriptionsTransportWS
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}
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};
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let sink = connection.clone();
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let mut stream = AGWebSocket::new(
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schema.clone(),
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connection
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.take_while(|msg| future::ready(msg.is_ok()))
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.map(Result::unwrap)
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.map(Message::into_data),
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protocol,
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)
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.on_connection_init(on_connection_init);
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while let Some(data) = stream.next().await {
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match data {
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WsMessage::Text(text) => {
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if sink.send_string(text).await.is_err() {
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break;
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}
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}
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WsMessage::Close(code, msg) => {
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let _ = sink
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.send(Message::Close(Some(CloseFrame {
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code: code.into(),
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reason: msg.into(),
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})))
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.await;
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break;
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}
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}
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}
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Ok(())
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}
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})
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.with_protocols(&ALL_WEBSOCKET_PROTOCOLS)
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}
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}
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