134 lines
4.3 KiB
Rust
134 lines
4.3 KiB
Rust
use actix::{
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Actor, ActorContext, ActorFuture, AsyncContext, ContextFutureSpawner, StreamHandler, WrapFuture,
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};
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use actix_web_actors::ws::{Message, ProtocolError, WebsocketContext};
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use async_graphql::{Data, FieldResult, ObjectType, Schema, SubscriptionType, WebSocketTransport};
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use futures::channel::mpsc;
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use futures::SinkExt;
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use std::time::{Duration, Instant};
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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> {
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schema: Schema<Query, Mutation, Subscription>,
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hb: Instant,
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sink: Option<mpsc::UnboundedSender<Vec<u8>>>,
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init_context_data: Option<Box<dyn Fn(serde_json::Value) -> FieldResult<Data> + Send + Sync>>,
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}
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impl<Query, Mutation, Subscription> WSSubscription<Query, Mutation, Subscription>
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where
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Query: ObjectType + Send + Sync + 'static,
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Mutation: ObjectType + Send + Sync + 'static,
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Subscription: SubscriptionType + Send + Sync + 'static,
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{
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/// Create an actor for subscription connection via websocket.
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pub fn new(schema: &Schema<Query, Mutation, Subscription>) -> Self {
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Self {
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schema: schema.clone(),
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hb: Instant::now(),
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sink: None,
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init_context_data: None,
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}
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}
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/// Set a context data initialization function.
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pub fn init_context_data<F>(self, f: F) -> Self
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where
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F: Fn(serde_json::Value) -> FieldResult<Data> + Send + Sync + 'static,
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{
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Self {
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init_context_data: Some(Box::new(f)),
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..self
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}
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}
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fn hb(&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.hb) > 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> Actor for WSSubscription<Query, Mutation, Subscription>
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where
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Query: ObjectType + Sync + Send + 'static,
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Mutation: ObjectType + Sync + Send + 'static,
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Subscription: SubscriptionType + Send + Sync + '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.hb(ctx);
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let schema = self.schema.clone();
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let (sink, stream) = schema.subscription_connection(
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if let Some(init_with_payload) = self.init_context_data.take() {
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WebSocketTransport::new(init_with_payload)
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} else {
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WebSocketTransport::default()
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},
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);
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ctx.add_stream(stream);
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self.sink = Some(sink);
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}
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}
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impl<Query, Mutation, Subscription> StreamHandler<Result<Message, ProtocolError>>
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for WSSubscription<Query, Mutation, Subscription>
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where
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Query: ObjectType + Sync + Send + 'static,
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Mutation: ObjectType + Sync + Send + 'static,
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Subscription: SubscriptionType + Send + Sync + '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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match msg {
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Message::Ping(msg) => {
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self.hb = Instant::now();
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ctx.pong(&msg);
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}
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Message::Pong(_) => {
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self.hb = Instant::now();
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}
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Message::Text(s) => {
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if let Some(mut sink) = self.sink.clone() {
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async move { sink.send(s.into()).await }
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.into_actor(self)
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.then(|_, actor, _| async {}.into_actor(actor))
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.wait(ctx);
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}
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}
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Message::Binary(_) | Message::Close(_) | Message::Continuation(_) => {
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ctx.stop();
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}
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Message::Nop => {}
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}
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}
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}
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impl<Query, Mutation, Subscription> StreamHandler<Vec<u8>>
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for WSSubscription<Query, Mutation, Subscription>
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where
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Query: ObjectType + Send + Sync + 'static,
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Mutation: ObjectType + Send + Sync + 'static,
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Subscription: SubscriptionType + Send + Sync + 'static,
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{
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fn handle(&mut self, data: Vec<u8>, ctx: &mut Self::Context) {
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if let Ok(text) = String::from_utf8(data) {
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ctx.text(text);
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}
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}
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}
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