2020-03-17 09:26:59 +00:00
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use crate::pubsub::{new_client, remove_client, PushMessage};
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use actix::{
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Actor, ActorContext, ActorFuture, AsyncContext, ContextFutureSpawner, Handler,
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ResponseActFuture, Running, 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::http::{GQLError, GQLRequest, GQLResponse};
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2020-03-26 03:34:28 +00:00
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use async_graphql::{ObjectType, QueryResult, Schema, Subscribe, SubscriptionType, Variables};
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2020-03-17 09:26:59 +00:00
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use std::collections::HashMap;
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use std::sync::Arc;
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2020-03-19 09:20:12 +00:00
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use std::time::{Duration, Instant};
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2020-03-17 09:26:59 +00:00
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#[derive(Serialize, Deserialize)]
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struct OperationMessage {
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#[serde(rename = "type")]
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ty: String,
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id: Option<String>,
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payload: Option<serde_json::Value>,
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}
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pub struct WsSession<Query, Mutation, Subscription> {
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schema: Arc<Schema<Query, Mutation, Subscription>>,
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hb: Instant,
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client_id: usize,
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subscribes: HashMap<String, Arc<Subscribe>>,
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}
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impl<Query, Mutation, Subscription> WsSession<Query, Mutation, Subscription>
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where
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2020-03-19 09:20:12 +00:00
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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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2020-03-17 09:26:59 +00:00
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{
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pub fn new(schema: Arc<Schema<Query, Mutation, Subscription>>) -> Self {
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Self {
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schema,
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hb: Instant::now(),
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client_id: 0,
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subscribes: Default::default(),
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}
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}
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2020-03-19 09:20:12 +00:00
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fn hb(&self, ctx: &mut WebsocketContext<Self>) {
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ctx.run_interval(Duration::new(1, 0), |act, ctx| {
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if Instant::now().duration_since(act.hb) > Duration::new(10, 0) {
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ctx.stop();
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}
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});
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}
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2020-03-17 09:26:59 +00:00
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}
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impl<Query, Mutation, Subscription> Actor for WsSession<Query, Mutation, Subscription>
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where
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2020-03-19 09:20:12 +00:00
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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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2020-03-17 09:26:59 +00:00
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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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2020-03-19 09:20:12 +00:00
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self.hb(ctx);
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2020-03-17 09:26:59 +00:00
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new_client(ctx.address().recipient())
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.into_actor(self)
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.then(|client_id, actor, _| {
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actor.client_id = client_id.unwrap();
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async {}.into_actor(actor)
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})
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.wait(ctx);
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}
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fn stopping(&mut self, _ctx: &mut Self::Context) -> Running {
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remove_client(self.client_id);
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Running::Stop
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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 WsSession<Query, Mutation, Subscription>
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where
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2020-03-19 09:20:12 +00:00
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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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2020-03-17 09:26:59 +00:00
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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 Ok(msg) = serde_json::from_str::<OperationMessage>(&s) {
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match msg.ty.as_str() {
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"connection_init" => {
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ctx.text(
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serde_json::to_string(&OperationMessage {
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ty: "connection_ack".to_string(),
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id: None,
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payload: None,
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})
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.unwrap(),
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);
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}
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"start" => {
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if let (Some(id), Some(payload)) = (msg.id, msg.payload) {
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if let Ok(request) = serde_json::from_value::<GQLRequest>(payload) {
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let builder = self.schema.subscribe(&request.query);
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let builder = if let Some(variables) = request.variables {
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match Variables::parse_from_json(variables) {
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Ok(variables) => builder.variables(variables),
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Err(_) => builder,
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}
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} else {
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builder
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};
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let builder =
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if let Some(operation_name) = &request.operation_name {
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builder.operator_name(&operation_name)
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} else {
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builder
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};
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let subscribe = match builder.execute() {
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Ok(subscribe) => subscribe,
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Err(err) => {
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ctx.text(
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serde_json::to_string(&OperationMessage {
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ty: "error".to_string(),
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id: Some(id),
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payload: Some(
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serde_json::to_value(GQLError(&err))
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.unwrap(),
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),
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})
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.unwrap(),
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);
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return;
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}
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};
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self.subscribes.insert(id, Arc::new(subscribe));
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}
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}
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}
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"stop" => {
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if let Some(id) = msg.id {
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self.subscribes.remove(&id);
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}
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}
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"connection_terminate" => {
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ctx.stop();
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}
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_ => {}
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}
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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> Handler<PushMessage>
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for WsSession<Query, Mutation, Subscription>
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where
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2020-03-19 09:20:12 +00:00
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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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2020-03-17 09:26:59 +00:00
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{
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type Result = ResponseActFuture<Self, std::result::Result<(), ()>>;
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fn handle(&mut self, msg: PushMessage, _ctx: &mut Self::Context) -> Self::Result {
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let subscribes = self.subscribes.clone();
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let schema = self.schema.clone();
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Box::new(
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async move {
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let mut push_msgs = Vec::new();
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for (id, subscribe) in subscribes {
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let res = match subscribe.resolve(&schema, msg.0.as_ref()).await {
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Ok(Some(value)) => Some(Ok(value)),
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Ok(None) => None,
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Err(err) => Some(Err(err)),
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};
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if let Some(res) = res {
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let push_msg = serde_json::to_string(&OperationMessage {
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ty: "data".to_string(),
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id: Some(id.clone()),
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2020-03-26 03:34:28 +00:00
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payload: Some(
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serde_json::to_value(GQLResponse(res.map(|data| QueryResult {
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data,
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extensions: None,
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})))
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.unwrap(),
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),
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2020-03-17 09:26:59 +00:00
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})
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.unwrap();
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push_msgs.push(push_msg);
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}
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}
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push_msgs
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}
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.into_actor(self)
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.map(|msgs, _, ctx| {
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for msg in msgs {
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ctx.text(msg);
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}
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Ok(())
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}),
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)
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}
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}
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