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use std::io;
use std::io::ErrorKind;
use async_graphql::http::MultipartOptions;
use async_graphql::{BatchRequest, ObjectType, Schema, SubscriptionType};
use futures_util::TryStreamExt;
use warp::hyper::header::HeaderName;
use warp::reply::Response as WarpResponse;
use warp::{Buf, Filter, Rejection, Reply};
use crate::BadRequest;
pub fn graphql_batch<Query, Mutation, Subscription>(
schema: Schema<Query, Mutation, Subscription>,
) -> impl Filter<Extract = ((Schema<Query, Mutation, Subscription>, BatchRequest),), Error = Rejection>
+ Clone
where
Query: ObjectType + 'static,
Mutation: ObjectType + 'static,
Subscription: SubscriptionType + 'static,
{
graphql_batch_opts(schema, Default::default())
}
pub fn graphql_batch_opts<Query, Mutation, Subscription>(
schema: Schema<Query, Mutation, Subscription>,
opts: MultipartOptions,
) -> impl Filter<Extract = ((Schema<Query, Mutation, Subscription>, BatchRequest),), Error = Rejection>
+ Clone
where
Query: ObjectType + 'static,
Mutation: ObjectType + 'static,
Subscription: SubscriptionType + 'static,
{
warp::any()
.and(warp::get().and(warp::query()).map(BatchRequest::Single))
.or(warp::post()
.and(warp::header::optional::<String>("content-type"))
.and(warp::body::stream())
.and_then(move |content_type, body| async move {
async_graphql::http::receive_batch_body(
content_type,
TryStreamExt::map_err(body, |e| io::Error::new(ErrorKind::Other, e))
.map_ok(|mut buf| {
let remaining = Buf::remaining(&buf);
Buf::copy_to_bytes(&mut buf, remaining)
})
.into_async_read(),
opts,
)
.await
.map_err(|e| warp::reject::custom(BadRequest(e)))
}))
.unify()
.map(move |res| (schema.clone(), res))
}
#[derive(Debug)]
pub struct BatchResponse(pub async_graphql::BatchResponse);
impl From<async_graphql::BatchResponse> for BatchResponse {
fn from(resp: async_graphql::BatchResponse) -> Self {
BatchResponse(resp)
}
}
impl Reply for BatchResponse {
fn into_response(self) -> WarpResponse {
let mut resp = warp::reply::with_header(
warp::reply::json(&self.0),
"content-type",
"application/json",
)
.into_response();
if self.0.is_ok() {
if let Some(cache_control) = self.0.cache_control().value() {
if let Ok(value) = cache_control.try_into() {
resp.headers_mut().insert("cache-control", value);
}
}
}
for (name, value) in self.0.http_headers() {
if let (Ok(name), Ok(value)) = (TryInto::<HeaderName>::try_into(name), value.try_into())
{
resp.headers_mut().append(name, value);
}
}
resp
}
}