322 lines
11 KiB
Rust
322 lines
11 KiB
Rust
//! Async-graphql integration with Wrap
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#![warn(missing_docs)]
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#![allow(clippy::type_complexity)]
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#![allow(clippy::needless_doctest_main)]
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#![forbid(unsafe_code)]
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use async_graphql::http::StreamBody;
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use async_graphql::{
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Data, FieldResult, IntoQueryBuilder, IntoQueryBuilderOpts, ObjectType, QueryBuilder,
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QueryResponse, Schema, SubscriptionType, WebSocketTransport,
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};
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use bytes::Bytes;
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use futures::select;
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use futures::{SinkExt, StreamExt};
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use std::sync::Arc;
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use warp::filters::ws::Message;
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use warp::filters::BoxedFilter;
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use warp::reject::Reject;
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use warp::reply::Response;
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use warp::{Filter, Rejection, Reply};
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/// Bad request error
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///
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/// It's a wrapper of `async_graphql::ParseRequestError`.
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pub struct BadRequest(pub async_graphql::ParseRequestError);
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impl std::fmt::Debug for BadRequest {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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write!(f, "{}", self.0)
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}
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}
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impl Reject for BadRequest {}
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/// GraphQL request filter
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///
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/// It outputs a tuple containing the `Schema` and `QuertBuilder`.
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///
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/// # Examples
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/// *[Full Example](<https://github.com/async-graphql/examples/blob/master/warp/starwars/src/main.rs>)*
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///
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/// ```no_run
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///
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/// use async_graphql::*;
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/// use async_graphql_warp::*;
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/// use warp::Filter;
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/// use std::convert::Infallible;
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///
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/// struct QueryRoot;
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///
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/// #[Object]
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/// impl QueryRoot {
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/// #[field]
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/// async fn value(&self, ctx: &Context<'_>) -> i32 {
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/// unimplemented!()
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/// }
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/// }
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///
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/// #[tokio::main]
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/// async fn main() {
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/// let schema = Schema::new(QueryRoot, EmptyMutation, EmptySubscription);
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/// let filter = async_graphql_warp::graphql(schema).and_then(|(schema, builder): (_, QueryBuilder)| async move {
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/// Ok::<_, Infallible>(GQLResponse::from(builder.execute(&schema).await))
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/// });
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/// warp::serve(filter).run(([0, 0, 0, 0], 8000)).await;
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/// }
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/// ```
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pub fn graphql<Query, Mutation, Subscription>(
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schema: Schema<Query, Mutation, Subscription>,
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) -> BoxedFilter<((Schema<Query, Mutation, Subscription>, QueryBuilder),)>
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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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warp::any()
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.and(warp::post())
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.and(warp::header::optional::<String>("content-type"))
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.and(warp::body::stream())
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.and(warp::any().map(move || schema.clone()))
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.and_then(|content_type, body, schema| async move {
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let builder = (content_type, StreamBody::new(body))
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.into_query_builder()
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.await
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.map_err(|err| warp::reject::custom(BadRequest(err)))?;
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Ok::<_, Rejection>((schema, builder))
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})
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.boxed()
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}
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/// Similar to graphql, but you can set the options `IntoQueryBuilderOpts`.
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pub fn graphql_opts<Query, Mutation, Subscription>(
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schema: Schema<Query, Mutation, Subscription>,
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opts: IntoQueryBuilderOpts,
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) -> BoxedFilter<((Schema<Query, Mutation, Subscription>, QueryBuilder),)>
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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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let opts = Arc::new(opts);
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warp::any()
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.and(warp::post())
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.and(warp::header::optional::<String>("content-type"))
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.and(warp::body::stream())
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.and(warp::any().map(move || opts.clone()))
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.and(warp::any().map(move || schema.clone()))
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.and_then(
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|content_type, body, opts: Arc<IntoQueryBuilderOpts>, schema| async move {
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let builder = (content_type, StreamBody::new(body))
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.into_query_builder_opts(&opts)
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.await
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.map_err(|err| warp::reject::custom(BadRequest(err)))?;
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Ok::<_, Rejection>((schema, builder))
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},
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)
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.boxed()
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}
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/// GraphQL subscription filter
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///
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/// # Examples
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///
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/// ```no_run
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/// use async_graphql::*;
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/// use async_graphql_warp::*;
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/// use warp::Filter;
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/// use futures::{Stream, StreamExt};
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/// use std::time::Duration;
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///
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/// struct QueryRoot;
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///
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/// #[Object]
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/// impl QueryRoot {}
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///
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/// struct SubscriptionRoot;
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///
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/// #[Subscription]
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/// impl SubscriptionRoot {
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/// #[field]
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/// async fn tick(&self) -> impl Stream<Item = String> {
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/// tokio::time::interval(Duration::from_secs(1)).map(|n| format!("{}", n.elapsed().as_secs_f32()))
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/// }
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/// }
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///
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/// #[tokio::main]
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/// async fn main() {
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/// let schema = Schema::new(QueryRoot, EmptyMutation, SubscriptionRoot);
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/// let filter = async_graphql_warp::graphql_subscription(schema);
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/// warp::serve(filter).run(([0, 0, 0, 0], 8000)).await;
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/// }
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/// ```
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pub fn graphql_subscription<Query, Mutation, Subscription>(
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schema: Schema<Query, Mutation, Subscription>,
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) -> BoxedFilter<(impl Reply,)>
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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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warp::any()
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.and(warp::ws())
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.and(warp::any().map(move || schema.clone()))
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.map(
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|ws: warp::ws::Ws, schema: Schema<Query, Mutation, Subscription>| {
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ws.on_upgrade(move |websocket| {
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let (mut tx, rx) = websocket.split();
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let (mut stx, srx) =
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schema.subscription_connection(WebSocketTransport::default());
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let mut rx = rx.fuse();
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let mut srx = srx.fuse();
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async move {
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loop {
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select! {
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bytes = srx.next() => {
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if let Some(bytes) = bytes {
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if let Ok(text) = String::from_utf8(bytes.to_vec()) {
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if tx.send(Message::text(text)).await.is_err()
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{
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return;
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}
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}
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} else {
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return;
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}
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}
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msg = rx.next() => {
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if let Some(Ok(msg)) = msg {
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if msg.is_text() {
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if stx.send(Bytes::copy_from_slice(msg.as_bytes())).await.is_err() {
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return;
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}
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}
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}
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}
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}
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}
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}
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})
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},
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).map(|reply| {
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warp::reply::with_header(reply, "Sec-WebSocket-Protocol", "graphql-ws")
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})
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.boxed()
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}
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/// GraphQL subscription filter
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///
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/// Specifies that a function converts the init payload to data.
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pub fn graphql_subscription_with_data<Query, Mutation, Subscription, F>(
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schema: Schema<Query, Mutation, Subscription>,
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init_context_data: F,
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) -> BoxedFilter<(impl Reply,)>
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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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F: Fn(serde_json::Value) -> FieldResult<Data> + Send + Sync + Clone + 'static,
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{
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warp::any()
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.and(warp::ws())
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.and(warp::any().map(move || schema.clone()))
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.and(warp::any().map(move || init_context_data.clone()))
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.map(
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|ws: warp::ws::Ws, schema: Schema<Query, Mutation, Subscription>, init_context_data: F| {
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ws.on_upgrade(move |websocket| {
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let (mut tx, rx) = websocket.split();
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let (mut stx, srx) =
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schema.subscription_connection(WebSocketTransport::new(init_context_data));
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let mut rx = rx.fuse();
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let mut srx = srx.fuse();
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async move {
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loop {
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select! {
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bytes = srx.next() => {
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if let Some(bytes) = bytes {
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if let Ok(text) = String::from_utf8(bytes.to_vec()) {
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if tx.send(Message::text(text)).await.is_err() {
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return;
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}
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}
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} else {
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return;
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}
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}
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msg = rx.next() => {
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if let Some(Ok(msg)) = msg {
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if msg.is_text() {
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if stx.send(Bytes::copy_from_slice(msg.as_bytes())).await.is_err() {
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return;
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}
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}
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}
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}
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}
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}
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}
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})
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},
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).map(|reply| {
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warp::reply::with_header(reply, "Sec-WebSocket-Protocol", "graphql-ws")
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})
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.boxed()
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}
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/// GraphQL reply
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pub struct GQLResponse(async_graphql::Result<QueryResponse>);
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impl From<async_graphql::Result<QueryResponse>> for GQLResponse {
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fn from(resp: async_graphql::Result<QueryResponse>) -> Self {
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GQLResponse(resp)
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}
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}
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fn add_cache_control(http_resp: &mut Response, resp: &async_graphql::Result<QueryResponse>) {
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if let Ok(QueryResponse { cache_control, .. }) = resp {
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if let Some(cache_control) = cache_control.value() {
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if let Ok(value) = cache_control.parse() {
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http_resp.headers_mut().insert("cache-control", value);
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}
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}
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}
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}
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impl Reply for GQLResponse {
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fn into_response(self) -> Response {
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let gql_resp = async_graphql::http::GQLResponse(self.0);
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let mut resp = warp::reply::with_header(
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warp::reply::json(&gql_resp),
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"content-type",
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"application/json",
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)
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.into_response();
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add_cache_control(&mut resp, &gql_resp.0);
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resp
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}
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}
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// Waiting for this release: https://github.com/hyperium/hyper/commit/042c770603a212f22387807efe4fc672959df40c
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// /// GraphQL streaming reply
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// pub struct GQLResponseStream(StreamResponse);
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//
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// impl From<StreamResponse> for GQLResponseStream {
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// fn from(resp: StreamResponse) -> Self {
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// GQLResponseStream(resp)
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// }
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// }
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//
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// impl Reply for GQLResponseStream {
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// fn into_response(self) -> Response {
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// match self.0 {
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// StreamResponse::Single(resp) => GQLResponse(resp).into_response(),
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// StreamResponse::Stream()
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// }
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// }
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// }
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