137 lines
4.5 KiB
Rust
137 lines
4.5 KiB
Rust
//! Async-graphql integration with Actix-web
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#![warn(missing_docs)]
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mod subscription;
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use actix_web::body::BodyStream;
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use actix_web::dev::{Payload, PayloadStream};
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use actix_web::http::StatusCode;
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use actix_web::{http, web, Error, FromRequest, HttpRequest, HttpResponse, Responder};
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use async_graphql::http::StreamBody;
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use async_graphql::{
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IntoQueryBuilder, IntoQueryBuilderOpts, ParseRequestError, QueryBuilder, QueryResponse,
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};
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use bytes::{buf::BufExt, Buf, Bytes};
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use futures::channel::mpsc;
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use futures::future::Ready;
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use futures::{Future, SinkExt, Stream, StreamExt, TryFutureExt};
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use std::pin::Pin;
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pub use subscription::WSSubscription;
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/// Extractor for GraphQL request
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///
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/// It's a wrapper of `QueryBuilder`, you can use `GQLRequest::into_inner` unwrap it to `QueryBuilder`.
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/// `async_graphql::IntoQueryBuilderOpts` allows to configure extraction process.
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pub struct GQLRequest(QueryBuilder);
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impl GQLRequest {
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/// Unwrap it to `QueryBuilder`.
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pub fn into_inner(self) -> QueryBuilder {
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self.0
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}
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}
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impl FromRequest for GQLRequest {
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type Error = Error;
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type Future = Pin<Box<dyn Future<Output = Result<GQLRequest, Error>>>>;
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type Config = IntoQueryBuilderOpts;
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fn from_request(req: &HttpRequest, payload: &mut Payload<PayloadStream>) -> Self::Future {
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let config = req.app_data::<Self::Config>().cloned().unwrap_or_default();
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let content_type = req
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.headers()
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.get(http::header::CONTENT_TYPE)
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.and_then(|value| value.to_str().ok())
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.map(|value| value.to_string());
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let (mut tx, rx) = mpsc::channel(16);
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// Because Payload is !Send, so forward it to mpsc::Sender
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let mut payload = web::Payload(payload.take());
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actix_rt::spawn(async move {
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while let Some(item) = payload.next().await {
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if tx.send(item).await.is_err() {
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return;
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}
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}
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});
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Box::pin(async move {
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(content_type, StreamBody::new(rx))
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.into_query_builder_opts(&config)
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.map_ok(GQLRequest)
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.map_err(|err| match err {
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ParseRequestError::PayloadTooLarge => {
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actix_web::error::ErrorPayloadTooLarge(err)
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}
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_ => actix_web::error::ErrorBadRequest(err),
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})
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.await
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})
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}
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}
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/// Responder for GraphQL response
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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(res: async_graphql::Result<QueryResponse>) -> Self {
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GQLResponse(res)
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}
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}
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impl Responder for GQLResponse {
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type Error = Error;
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type Future = Ready<Result<HttpResponse, Error>>;
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fn respond_to(self, _req: &HttpRequest) -> Self::Future {
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let res = HttpResponse::build(StatusCode::OK)
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.content_type("application/json")
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.body(serde_json::to_string(&async_graphql::http::GQLResponse(self.0)).unwrap());
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futures::future::ok(res)
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}
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}
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/// Responder for GraphQL response stream
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pub struct GQLResponseStream<S: Stream<Item = async_graphql::Result<QueryResponse>>>(S);
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impl<S: Stream<Item = async_graphql::Result<QueryResponse>> + 'static> From<S>
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for GQLResponseStream<S>
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{
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fn from(stream: S) -> Self {
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GQLResponseStream(stream)
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}
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}
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impl<S: Stream<Item = async_graphql::Result<QueryResponse>> + Unpin + 'static> Responder
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for GQLResponseStream<S>
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{
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type Error = Error;
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type Future = Ready<Result<HttpResponse, Error>>;
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fn respond_to(self, _req: &HttpRequest) -> Self::Future {
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let body = BodyStream::new(
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self.0
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.map(|res| serde_json::to_vec(&async_graphql::http::GQLResponse(res)).unwrap())
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.map(|data| {
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Ok::<_, std::convert::Infallible>(
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Bytes::from(format!(
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"\r\n---\r\nContent-Type: application/json\r\nContent-Length: {}\r\n\r\n",
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data.len()
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))
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.chain(Bytes::from(data))
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.to_bytes(),
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)
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})
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.chain(futures::stream::once(futures::future::ok(
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Bytes::from_static(b"\r\n-----\r\n"),
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))),
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);
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let res = HttpResponse::build(StatusCode::OK)
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.content_type("multipart/mixed; boundary=\"-\"")
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.body(body);
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futures::future::ok(res)
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}
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}
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