219 lines
7.1 KiB
Rust
219 lines
7.1 KiB
Rust
use std::future::Future;
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use std::str::FromStr;
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use std::time::{Duration, Instant};
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use actix::ActorFutureExt;
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use actix::{
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Actor, ActorContext, ActorStreamExt, AsyncContext, ContextFutureSpawner, StreamHandler,
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WrapFuture, WrapStream,
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};
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use actix_http::error::PayloadError;
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use actix_http::{ws, Error};
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use actix_web::web::{BufMut, Bytes, BytesMut};
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use actix_web::{HttpRequest, HttpResponse};
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use actix_web_actors::ws::{CloseReason, Message, ProtocolError, WebsocketContext};
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use async_graphql::http::{WebSocket, WebSocketProtocols, WsMessage, ALL_WEBSOCKET_PROTOCOLS};
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use async_graphql::{Data, ObjectType, Result, Schema, SubscriptionType};
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use futures_channel::mpsc;
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use futures_util::future::Ready;
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use futures_util::stream::Stream;
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use futures_util::SinkExt;
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const HEARTBEAT_INTERVAL: Duration = Duration::from_secs(5);
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const CLIENT_TIMEOUT: Duration = Duration::from_secs(10);
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/// Actor for subscription via websocket
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pub struct WSSubscription<Query, Mutation, Subscription, F> {
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schema: Schema<Query, Mutation, Subscription>,
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protocol: WebSocketProtocols,
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last_heartbeat: Instant,
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messages: Option<mpsc::UnboundedSender<Bytes>>,
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initializer: Option<F>,
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continuation: BytesMut,
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}
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impl<Query, Mutation, Subscription>
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WSSubscription<Query, Mutation, Subscription, fn(serde_json::Value) -> Ready<Result<Data>>>
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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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/// Start an actor for subscription connection via websocket.
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pub fn start<T>(
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schema: Schema<Query, Mutation, Subscription>,
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request: &HttpRequest,
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stream: T,
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) -> Result<HttpResponse, Error>
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where
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T: Stream<Item = Result<Bytes, PayloadError>> + 'static,
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{
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Self::start_with_initializer(schema, request, stream, |_| {
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futures_util::future::ready(Ok(Default::default()))
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})
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}
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}
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impl<Query, Mutation, Subscription, F, R> WSSubscription<Query, Mutation, Subscription, F>
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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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F: FnOnce(serde_json::Value) -> R + Unpin + Send + 'static,
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R: Future<Output = Result<Data>> + Send + 'static,
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{
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/// Start an actor for subscription connection via websocket with an initialization function.
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pub fn start_with_initializer<T>(
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schema: Schema<Query, Mutation, Subscription>,
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request: &HttpRequest,
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stream: T,
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initializer: F,
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) -> Result<HttpResponse, Error>
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where
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T: Stream<Item = Result<Bytes, PayloadError>> + 'static,
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F: FnOnce(serde_json::Value) -> R + Unpin + Send + 'static,
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R: Future<Output = Result<Data>> + Send + 'static,
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{
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let protocol = match request
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.headers()
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.get("sec-websocket-protocol")
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.and_then(|value| value.to_str().ok())
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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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actix_web_actors::ws::start_with_protocols(
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Self {
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schema,
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protocol,
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last_heartbeat: Instant::now(),
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messages: None,
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initializer: Some(initializer),
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continuation: BytesMut::new(),
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},
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&ALL_WEBSOCKET_PROTOCOLS,
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request,
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stream,
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)
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}
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fn send_heartbeats(&self, ctx: &mut WebsocketContext<Self>) {
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ctx.run_interval(HEARTBEAT_INTERVAL, |act, ctx| {
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if Instant::now().duration_since(act.last_heartbeat) > CLIENT_TIMEOUT {
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ctx.stop();
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}
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ctx.ping(b"");
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});
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}
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}
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impl<Query, Mutation, Subscription, F, R> Actor for WSSubscription<Query, Mutation, Subscription, F>
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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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F: FnOnce(serde_json::Value) -> R + Unpin + Send + 'static,
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R: Future<Output = Result<Data>> + Send + 'static,
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{
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type Context = WebsocketContext<Self>;
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fn started(&mut self, ctx: &mut Self::Context) {
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self.send_heartbeats(ctx);
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let (tx, rx) = mpsc::unbounded();
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WebSocket::with_data(
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self.schema.clone(),
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rx,
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self.initializer.take().unwrap(),
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self.protocol,
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)
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.into_actor(self)
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.map(|response, _act, ctx| match response {
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WsMessage::Text(text) => ctx.text(text),
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WsMessage::Close(code, msg) => ctx.close(Some(CloseReason {
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code: code.into(),
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description: Some(msg),
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})),
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})
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.finish()
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.spawn(ctx);
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self.messages = Some(tx);
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}
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}
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impl<Query, Mutation, Subscription, F, R> StreamHandler<Result<Message, ProtocolError>>
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for WSSubscription<Query, Mutation, Subscription, F>
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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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F: FnOnce(serde_json::Value) -> R + Unpin + Send + 'static,
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R: Future<Output = Result<Data>> + Send + 'static,
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{
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fn handle(&mut self, msg: Result<Message, ProtocolError>, ctx: &mut Self::Context) {
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let msg = match msg {
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Err(_) => {
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ctx.stop();
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return;
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}
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Ok(msg) => msg,
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};
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let message = match msg {
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Message::Ping(msg) => {
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self.last_heartbeat = Instant::now();
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ctx.pong(&msg);
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None
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}
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Message::Pong(_) => {
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self.last_heartbeat = Instant::now();
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None
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}
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Message::Continuation(item) => match item {
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ws::Item::FirstText(bytes) | ws::Item::FirstBinary(bytes) => {
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self.continuation.clear();
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self.continuation.put(bytes);
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None
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}
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ws::Item::Continue(bytes) => {
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self.continuation.put(bytes);
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None
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}
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ws::Item::Last(bytes) => {
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self.continuation.put(bytes);
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Some(std::mem::take(&mut self.continuation).freeze())
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}
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},
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Message::Text(s) => Some(s.into_bytes()),
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Message::Binary(bytes) => Some(bytes),
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Message::Close(_) => {
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ctx.stop();
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None
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}
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Message::Nop => None,
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};
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if let Some(message) = message {
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let mut sender = self.messages.as_ref().unwrap().clone();
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async move { sender.send(message).await }
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.into_actor(self)
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.map(|res, _actor, ctx| match res {
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Ok(()) => {}
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Err(_) => ctx.stop(),
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})
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.spawn(ctx)
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}
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}
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}
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