2020-03-18 22:31:36 -05:00
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//! This example demonstrates asynchronous subscriptions with warp and tokio 0.2
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use std::{pin::Pin, sync::Arc, time::Duration};
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use futures::{Future, FutureExt as _, Stream};
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use juniper::{DefaultScalarValue, EmptyMutation, FieldError, RootNode};
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use juniper_subscriptions::Coordinator;
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use juniper_warp::{playground_filter, subscriptions::graphql_subscriptions};
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use warp::{http::Response, Filter};
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#[derive(Clone)]
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struct Context {}
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impl juniper::Context for Context {}
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#[derive(Clone, Copy, juniper::GraphQLEnum)]
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enum UserKind {
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Admin,
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User,
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Guest,
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}
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struct User {
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id: i32,
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kind: UserKind,
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name: String,
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}
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// Field resolvers implementation
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#[juniper::graphql_object(Context = Context)]
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impl User {
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fn id(&self) -> i32 {
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self.id
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}
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fn kind(&self) -> UserKind {
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self.kind
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}
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fn name(&self) -> &str {
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&self.name
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}
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async fn friends(&self) -> Vec<User> {
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if self.id == 1 {
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return vec![
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User {
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id: 11,
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kind: UserKind::User,
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name: "user11".into(),
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},
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User {
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id: 12,
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kind: UserKind::Admin,
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name: "user12".into(),
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},
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User {
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id: 13,
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kind: UserKind::Guest,
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name: "user13".into(),
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},
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];
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} else if self.id == 2 {
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return vec![User {
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id: 21,
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kind: UserKind::User,
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name: "user21".into(),
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}];
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} else if self.id == 3 {
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return vec![
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User {
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id: 31,
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kind: UserKind::User,
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name: "user31".into(),
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},
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User {
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id: 32,
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kind: UserKind::Guest,
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name: "user32".into(),
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},
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];
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} else {
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return vec![];
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}
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}
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}
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struct Query;
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#[juniper::graphql_object(Context = Context)]
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impl Query {
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async fn users(id: i32) -> Vec<User> {
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vec![User {
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id,
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kind: UserKind::Admin,
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name: "User Name".into(),
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}]
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}
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}
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type UsersStream = Pin<Box<dyn Stream<Item = Result<User, FieldError>> + Send>>;
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struct Subscription;
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#[juniper::graphql_subscription(Context = Context)]
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impl Subscription {
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async fn users() -> UsersStream {
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let mut counter = 0;
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let stream = tokio::time::interval(Duration::from_secs(5)).map(move |_| {
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counter += 1;
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if counter == 2 {
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Err(FieldError::new(
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"some field error from handler",
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Value::Scalar(DefaultScalarValue::String(
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"some additional string".to_string(),
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)),
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))
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} else {
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Ok(User {
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id: counter,
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kind: UserKind::Admin,
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name: "stream user".to_string(),
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})
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}
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});
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Box::pin(stream)
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}
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}
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type Schema = RootNode<'static, Query, EmptyMutation<Context>, Subscription>;
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fn schema() -> Schema {
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Schema::new(Query, EmptyMutation::new(), Subscription)
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}
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#[tokio::main]
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async fn main() {
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::std::env::set_var("RUST_LOG", "warp_subscriptions");
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env_logger::init();
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let log = warp::log("warp_server");
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let homepage = warp::path::end().map(|| {
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Response::builder()
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.header("content-type", "text/html")
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2020-03-20 11:11:06 -05:00
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.body("<html><h1>juniper_subscriptions demo</h1><div>visit <a href=\"/playground\">graphql playground</a></html>".to_string())
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2020-03-18 22:31:36 -05:00
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});
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let qm_schema = schema();
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let qm_state = warp::any().map(move || Context {});
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let qm_graphql_filter = juniper_warp::make_graphql_filter(qm_schema, qm_state.boxed());
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let sub_state = warp::any().map(move || Context {});
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let coordinator = Arc::new(juniper_subscriptions::Coordinator::new(schema()));
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log::info!("Listening on 127.0.0.1:8080");
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let routes = (warp::path("subscriptions")
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.and(warp::ws())
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.and(sub_state.clone())
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.and(warp::any().map(move || Arc::clone(&coordinator)))
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.map(
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|ws: warp::ws::Ws,
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ctx: Context,
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coordinator: Arc<Coordinator<'static, _, _, _, _, _>>| {
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ws.on_upgrade(|websocket| -> Pin<Box<dyn Future<Output = ()> + Send>> {
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2020-03-30 22:43:00 -05:00
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graphql_subscriptions(websocket, coordinator, ctx)
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.map(|r| {
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if let Err(e) = r {
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println!("Websocket error: {}", e);
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}
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})
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.boxed()
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2020-03-18 22:31:36 -05:00
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})
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},
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))
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2020-03-30 22:43:00 -05:00
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.map(|reply| {
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// TODO#584: remove this workaround
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warp::reply::with_header(reply, "Sec-WebSocket-Protocol", "graphql-ws")
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})
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2020-03-18 22:31:36 -05:00
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.or(warp::post()
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.and(warp::path("graphql"))
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.and(qm_graphql_filter))
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.or(warp::get()
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.and(warp::path("playground"))
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.and(playground_filter("/graphql", Some("/subscriptions"))))
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.or(homepage)
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.with(log);
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warp::serve(routes).run(([127, 0, 0, 1], 8080)).await;
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}
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