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<ol class="chapter"><li class="chapter-item expanded "><a href="../introduction.html"><strong aria-hidden="true">1.</strong> Introduction</a></li><li class="chapter-item expanded "><a href="../quickstart.html"><strong aria-hidden="true">2.</strong> Quickstart</a></li><li class="chapter-item expanded "><a href="../types/index.html"><strong aria-hidden="true">3.</strong> Type system</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../types/objects/index.html"><strong aria-hidden="true">3.1.</strong> Objects</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../types/objects/complex_fields.html"><strong aria-hidden="true">3.1.1.</strong> Complex fields</a></li><li class="chapter-item expanded "><a href="../types/objects/context.html"><strong aria-hidden="true">3.1.2.</strong> Context</a></li><li class="chapter-item expanded "><a href="../types/objects/error/index.html"><strong aria-hidden="true">3.1.3.</strong> Error handling</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../types/objects/error/field.html"><strong aria-hidden="true">3.1.3.1.</strong> Field errors</a></li><li class="chapter-item expanded "><a href="../types/objects/error/schema.html"><strong aria-hidden="true">3.1.3.2.</strong> Schema errors</a></li></ol></li><li class="chapter-item expanded "><a href="../types/objects/generics.html"><strong aria-hidden="true">3.1.4.</strong> Generics</a></li></ol></li><li class="chapter-item expanded "><a href="../types/interfaces.html"><strong aria-hidden="true">3.2.</strong> Interfaces</a></li><li class="chapter-item expanded "><a href="../types/unions.html"><strong aria-hidden="true">3.3.</strong> Unions</a></li><li class="chapter-item expanded "><a href="../types/enums.html"><strong aria-hidden="true">3.4.</strong> Enums</a></li><li class="chapter-item expanded "><a href="../types/input_objects.html"><strong aria-hidden="true">3.5.</strong> Input objects</a></li><li class="chapter-item expanded "><a href="../types/scalars.html"><strong aria-hidden="true">3.6.</strong> Scalars</a></li></ol></li><li class="chapter-item expanded "><a href="../schema/index.html"><strong aria-hidden="true">4.</strong> Schema</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../schema/subscriptions.html" class="active"><strong aria-hidden="true">4.1.</strong> Subscriptions</a></li><li class="chapter-item expanded "><a href="../schema/introspection.html"><strong aria-hidden="true">4.2.</strong> Introspection</a></li></ol></li><li class="chapter-item expanded "><a href="../serve/index.html"><strong aria-hidden="true">5.</strong> Serving</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../serve/batching.html"><strong aria-hidden="true">5.1.</strong> Batching</a></li></ol></li><li class="chapter-item expanded "><a href="../advanced/index.html"><strong aria-hidden="true">6.</strong> Advanced Topics</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../advanced/implicit_and_explicit_null.html"><strong aria-hidden="true">6.1.</strong> Implicit and explicit null</a></li><li class="chapter-item expanded "><a href="../advanced/n_plus_1.html"><strong aria-hidden="true">6.2.</strong> N+1 problem</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../advanced/dataloader.html"><strong aria-hidden="true">6.2.1.</strong> DataLoader</a></li><li class="chapter-item expanded "><a href="../advanced/lookahead.html"><strong aria-hidden="true">6.2.2.</strong> Look-ahead</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../advanced/eager_loading.html"><strong aria-hidden="true">6.2.2.1.</strong> Eager loading</a></li></ol></li></ol></li></ol></li></ol>
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<h1 id="subscriptions"><a class="header" href="#subscriptions">Subscriptions</a></h1>
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<p><a href="https://spec.graphql.org/October2021#sec-Subscription">GraphQL subscriptions</a> are a way to push data from a server to clients requesting real-time messages from a server. <a href="https://spec.graphql.org/October2021#sec-Subscription">Subscriptions</a> are similar to <a href="https://spec.graphql.org/October2021#sec-Query">queries</a> in that they specify a set of fields to be delivered to a client, but instead of immediately returning a single answer a result is sent every time a particular event happens on a server.</p>
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<p>In order to execute <a href="https://spec.graphql.org/October2021#sec-Subscription">subscriptions</a> in <a href="https://docs.rs/juniper">Juniper</a>, we need a coordinator (spawning long-lived connections) and a <a href="https://spec.graphql.org/October2021#sec-Objects">GraphQL object</a> with <a href="https://spec.graphql.org/October2021#sec-Language.Fields">fields</a> resolving into a <a href="https://docs.rs/futures/latest/futures/stream/trait.Stream.html"><code>Stream</code></a> of elements which will then be returned to a client. The <a href="https://docs.rs/juniper_subscriptions"><code>juniper_subscriptions</code> crate</a> provides a default implementation of these abstractions.</p>
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<p>The <a href="https://spec.graphql.org/October2021#sel-FAHTRJCAACC3EhsX">subscription root</a> is just a <a href="https://spec.graphql.org/October2021#sec-Objects">GraphQL object</a>, similar to the <a href="https://spec.graphql.org/October2021#sel-FAHTRFCAACChCtpG">query root</a> and <a href="https://spec.graphql.org/October2021#sel-FAHTRHCAACCuE9yD">mutations root</a> that we define for operations in our <a href="https://spec.graphql.org/October2021#sec-Schema">GraphQL schema</a>. For <a href="https://spec.graphql.org/October2021#sec-Subscription">subscriptions</a> all fields should be <code>async</code> and return a <a href="https://docs.rs/futures/latest/futures/stream/trait.Stream.html"><code>Stream</code></a> of some <a href="https://spec.graphql.org/October2021#sec-Types">GraphQL type</a> values, rather than direct values.</p>
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<pre><pre class="playground"><code class="language-rust edition2021"><span class="boring">extern crate futures;
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</span><span class="boring">extern crate juniper;
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</span><span class="boring">use std::pin::Pin;
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</span><span class="boring">use futures::Stream;
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</span><span class="boring">use juniper::{graphql_object, graphql_subscription, FieldError};
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</span><span class="boring">
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</span><span class="boring">#[derive(Clone)]
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</span><span class="boring">pub struct Database;
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</span><span class="boring">
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</span><span class="boring">impl juniper::Context for Database {}
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</span><span class="boring">
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</span><span class="boring">pub struct Query;
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</span><span class="boring">
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</span><span class="boring">#[graphql_object]
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</span><span class="boring">#[graphql(context = Database)]
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</span><span class="boring">impl Query {
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</span><span class="boring"> fn hello_world() -> &'static str {
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</span><span class="boring"> "Hello World!"
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</span><span class="boring"> }
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</span><span class="boring">}
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</span><span class="boring">
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</span>type StringStream = Pin<Box<dyn Stream<Item = Result<String, FieldError>> + Send>>;
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pub struct Subscription;
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#[graphql_subscription]
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#[graphql(context = Database)]
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impl Subscription {
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// This subscription operation emits two values sequentially:
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// the `String`s "Hello" and "World!".
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async fn hello_world() -> StringStream {
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let stream = futures::stream::iter([
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Ok(String::from("Hello")),
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Ok(String::from("World!")),
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]);
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Box::pin(stream)
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}
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}
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<span class="boring">
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</span><span class="boring">fn main () {}</span></code></pre></pre>
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<h2 id="coordinator"><a class="header" href="#coordinator">Coordinator</a></h2>
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<p><a href="https://spec.graphql.org/October2021#sec-Subscription">GraphQL subscriptions</a> require a bit more resources than regular <a href="https://spec.graphql.org/October2021#sec-Query">queries</a> and provide a great vector for <a href="https://en.wikipedia.org/wiki/Denial-of-service_attack">DoS attacks</a>. This can can bring down a server easily if not handled correctly. The <a href="https://docs.rs/juniper/0.16.1/juniper/trait.SubscriptionCoordinator.html"><code>SubscriptionCoordinator</code> trait</a> provides coordination logic to enable functionality like <a href="https://en.wikipedia.org/wiki/Denial-of-service_attack">DoS attacks</a> mitigation and resource limits.</p>
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<p>The <a href="https://docs.rs/juniper/0.16.1/juniper/trait.SubscriptionCoordinator.html"><code>SubscriptionCoordinator</code></a> contains the <a href="https://spec.graphql.org/October2021#sec-Schema">schema</a> and can keep track of opened connections, handle <a href="https://spec.graphql.org/October2021#sec-Subscription">subscription</a> start and end, and maintain a global ID for each <a href="https://spec.graphql.org/October2021#sec-Subscription">subscription</a>. Each time a connection is established, the <a href="https://docs.rs/juniper/0.16.1/juniper/trait.SubscriptionCoordinator.html"><code>SubscriptionCoordinator</code></a> spawns a [32], which handles a single connection, providing resolver logic for a client stream as well as reconnection and shutdown logic.</p>
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<p>While we can implement <a href="https://docs.rs/juniper/0.16.1/juniper/trait.SubscriptionCoordinator.html"><code>SubscriptionCoordinator</code></a> ourselves, <a href="https://docs.rs/juniper">Juniper</a> contains a simple and generic implementation called <a href="https://docs.rs/juniper_subscriptions/0.17.0/juniper_subscriptions/struct.Coordinator.html"><code>Coordinator</code></a>. The <code>subscribe</code> method returns a <a href="https://doc.rust-lang.org/stable/std/future/trait.Future.html"><code>Future</code></a> resolving into a <code>Result<Connection, GraphQLError></code>, where <a href="https://docs.rs/juniper_subscriptions/0.17.0/juniper_subscriptions/struct.Connection.html"><code>Connection</code></a> is a <a href="https://docs.rs/futures/latest/futures/stream/trait.Stream.html"><code>Stream</code></a> of <a href="https://spec.graphql.org/October2021#sec-Values">values</a> returned by the operation, and a <a href="https://docs.rs/juniper/0.16.1/juniper/enum.GraphQLError.html"><code>GraphQLError</code></a> is the error when the <a href="https://spec.graphql.org/October2021#sec-Subscription">subscription operation</a> fails.</p>
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<pre><pre class="playground"><code class="language-rust edition2021"><span class="boring">extern crate futures;
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</span><span class="boring">extern crate juniper;
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</span><span class="boring">extern crate juniper_subscriptions;
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</span><span class="boring">extern crate serde_json;
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</span><span class="boring">use std::pin::Pin;
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</span><span class="boring">use futures::{Stream, StreamExt as _};
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</span><span class="boring">use juniper::{
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</span><span class="boring"> http::GraphQLRequest,
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</span><span class="boring"> graphql_object, graphql_subscription,
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</span><span class="boring"> DefaultScalarValue, EmptyMutation, FieldError,
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</span><span class="boring"> RootNode, SubscriptionCoordinator,
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</span><span class="boring">};
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</span><span class="boring">use juniper_subscriptions::Coordinator;
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</span><span class="boring">
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</span><span class="boring">#[derive(Clone)]
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</span><span class="boring">pub struct Database;
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</span><span class="boring">
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</span><span class="boring">impl juniper::Context for Database {}
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</span><span class="boring">
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</span><span class="boring">impl Database {
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</span><span class="boring"> fn new() -> Self {
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</span><span class="boring"> Self
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</span><span class="boring"> }
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</span><span class="boring">}
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</span><span class="boring">
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</span><span class="boring">pub struct Query;
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</span><span class="boring">
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</span><span class="boring">#[graphql_object]
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</span><span class="boring">#[graphql(context = Database)]
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</span><span class="boring">impl Query {
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</span><span class="boring"> fn hello_world() -> &'static str {
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</span><span class="boring"> "Hello World!"
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</span><span class="boring"> }
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</span><span class="boring">}
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</span><span class="boring">
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</span><span class="boring">type StringStream = Pin<Box<dyn Stream<Item = Result<String, FieldError>> + Send>>;
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</span><span class="boring">
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</span><span class="boring">pub struct Subscription;
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</span><span class="boring">
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</span><span class="boring">#[graphql_subscription]
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</span><span class="boring">#[graphql(context = Database)]
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</span><span class="boring">impl Subscription {
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</span><span class="boring"> async fn hello_world() -> StringStream {
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</span><span class="boring"> let stream = futures::stream::iter([
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</span><span class="boring"> Ok(String::from("Hello")),
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</span><span class="boring"> Ok(String::from("World!")),
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</span><span class="boring"> ]);
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</span><span class="boring"> Box::pin(stream)
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</span><span class="boring"> }
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</span><span class="boring">}
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</span><span class="boring">
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</span>type Schema = RootNode<'static, Query, EmptyMutation<Database>, 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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async fn run_subscription() {
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let schema = schema();
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let coordinator = Coordinator::new(schema);
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let db = Database::new();
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let req: GraphQLRequest<DefaultScalarValue> = serde_json::from_str(
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r#"{
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"query": "subscription { helloWorld }"
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}"#,
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).unwrap();
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let mut conn = coordinator.subscribe(&req, &db).await.unwrap();
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while let Some(result) = conn.next().await {
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println!("{}", serde_json::to_string(&result).unwrap());
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}
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}
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<span class="boring">
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</span><span class="boring">fn main() {}</span></code></pre></pre>
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|
<h2 id="websocket"><a class="header" href="#websocket">WebSocket</a></h2>
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<p>For information about serving <a href="https://spec.graphql.org/October2021#sec-Subscription">GraphQL subscriptions</a> over <a href="https://en.wikipedia.org/wiki/WebSocket">WebSocket</a>, see the <a href="../serve/index.html#websocket">"Serving" chapter</a>.</p>
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