4ef8cf7de9
- rework `make_graphql_filter()` and `make_graphql_filter_sync()` to execute `context_extractor` only once - handle all non-recoverable `Rejection`s in `make_graphql_filter()` and `make_graphql_filter_sync()` - relax requirement for `context_extractor` to be a `BoxedFilter` only - remove `JoinError` from public API - provide example of fallible `context_extractor` in `make_graphql_filter()` API docs Additionally: - split `juniper_warp` modules into separate files - add @tyranron as `juniper_warp` co-author
188 lines
4.7 KiB
Rust
188 lines
4.7 KiB
Rust
//! This example demonstrates asynchronous subscriptions with [`warp`].
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use std::{env, pin::Pin, sync::Arc, time::Duration};
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use futures::Stream;
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use juniper::{
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graphql_object, graphql_subscription, graphql_value, EmptyMutation, FieldError, GraphQLEnum,
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RootNode,
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};
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use juniper_graphql_ws::ConnectionConfig;
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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, 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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#[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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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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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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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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vec![]
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}
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}
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}
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struct Query;
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#[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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#[graphql_subscription(context = Context)]
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impl Subscription {
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async fn users() -> UsersStream {
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let mut interval = tokio::time::interval(Duration::from_secs(5));
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let stream = async_stream::stream! {
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let mut counter = 0;
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loop {
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counter += 1;
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interval.tick().await;
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if counter == 5 {
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yield Err(FieldError::new(
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"some field error from handler",
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graphql_value!("some additional string"),
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))
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} else {
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yield Ok(User {
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id: counter,
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kind: UserKind::Admin,
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name: "stream user".into(),
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})
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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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env::set_var("RUST_LOG", "subscription");
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env_logger::init();
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let log = warp::log("subscription");
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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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.body(
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"<html><h1>juniper_warp/subscription example</h1>\
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<div>visit <a href=\"/graphiql\">GraphiQL</a></div>\
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<div>visit <a href=\"/playground\">GraphQL Playground</a></div>\
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</html>",
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)
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});
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let schema = Arc::new(schema());
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let routes = (warp::post()
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.and(warp::path("graphql"))
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.and(juniper_warp::make_graphql_filter(
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schema.clone(),
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warp::any().map(|| Context),
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)))
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.or(
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warp::path("subscriptions").and(juniper_warp::subscriptions::make_ws_filter(
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schema,
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ConnectionConfig::new(Context),
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)),
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)
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.or(warp::get()
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.and(warp::path("playground"))
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.and(juniper_warp::playground_filter(
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"/graphql",
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Some("/subscriptions"),
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)))
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.or(warp::get()
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.and(warp::path("graphiql"))
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.and(juniper_warp::graphiql_filter(
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"/graphql",
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Some("/subscriptions"),
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)))
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.or(homepage)
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.with(log);
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log::info!("Listening on 127.0.0.1:8080");
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warp::serve(routes).run(([127, 0, 0, 1], 8080)).await;
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}
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