#![warn(missing_docs)]
#![allow(clippy::type_complexity)]
#![allow(clippy::needless_doctest_main)]
#![forbid(unsafe_code)]
use async_graphql::http::MultipartOptions;
use async_graphql::{
resolver_utils::ObjectType, Data, FieldResult, Request, Schema, SubscriptionType,
};
use futures::io::ErrorKind;
use futures::{select, TryStreamExt};
use futures::{SinkExt, StreamExt};
use hyper::Method;
use std::io;
use std::sync::Arc;
use warp::filters::ws::Message;
use warp::filters::BoxedFilter;
use warp::reject::Reject;
use warp::reply::Response;
use warp::{Buf, Filter, Rejection, Reply};
pub struct BadRequest(pub anyhow::Error);
impl std::fmt::Debug for BadRequest {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
write!(f, "{}", self.0)
}
}
impl Reject for BadRequest {}
pub fn graphql<Query, Mutation, Subscription>(
schema: Schema<Query, Mutation, Subscription>,
) -> BoxedFilter<((
Schema<Query, Mutation, Subscription>,
async_graphql::Request,
),)>
where
Query: ObjectType + Send + Sync + 'static,
Mutation: ObjectType + Send + Sync + 'static,
Subscription: SubscriptionType + Send + Sync + 'static,
{
graphql_opts(schema, Default::default())
}
pub fn graphql_opts<Query, Mutation, Subscription>(
schema: Schema<Query, Mutation, Subscription>,
opts: MultipartOptions,
) -> BoxedFilter<((
Schema<Query, Mutation, Subscription>,
async_graphql::Request,
),)>
where
Query: ObjectType + Send + Sync + 'static,
Mutation: ObjectType + Send + Sync + 'static,
Subscription: SubscriptionType + Send + Sync + 'static,
{
let opts = Arc::new(opts);
warp::any()
.and(warp::method())
.and(warp::query::raw().or(warp::any().map(String::new)).unify())
.and(warp::header::optional::<String>("content-type"))
.and(warp::body::stream())
.and(warp::any().map(move || opts.clone()))
.and(warp::any().map(move || schema.clone()))
.and_then(
|method,
query: String,
content_type,
body,
opts: Arc<MultipartOptions>,
schema| async move {
if method == Method::GET {
let request: Request = serde_urlencoded::from_str(&query)
.map_err(|err| warp::reject::custom(BadRequest(err.into())))?;
Ok::<_, Rejection>((schema, request))
} else {
let request = async_graphql::http::receive_body(
content_type,
futures::TryStreamExt::map_err(body, |err| io::Error::new(ErrorKind::Other, err))
.map_ok(|mut buf| Buf::to_bytes(&mut buf))
.into_async_read(),
MultipartOptions::clone(&opts),
)
.await
.map_err(|err| warp::reject::custom(BadRequest(err.into())))?;
Ok::<_, Rejection>((schema, request))
}
},
)
.boxed()
}
pub fn graphql_subscription<Query, Mutation, Subscription>(
schema: Schema<Query, Mutation, Subscription>,
) -> BoxedFilter<(impl Reply,)>
where
Query: ObjectType + Sync + Send + 'static,
Mutation: ObjectType + Sync + Send + 'static,
Subscription: SubscriptionType + Send + Sync + 'static,
{
graphql_subscription_with_initializer(schema, |_| Ok(Default::default()))
}
pub fn graphql_subscription_with_initializer<Query, Mutation, Subscription, F>(
schema: Schema<Query, Mutation, Subscription>,
initializer: F,
) -> BoxedFilter<(impl Reply,)>
where
Query: ObjectType + Sync + Send + 'static,
Mutation: ObjectType + Sync + Send + 'static,
Subscription: SubscriptionType + Send + Sync + 'static,
F: Fn(serde_json::Value) -> FieldResult<Data> + Send + Sync + Clone + 'static,
{
warp::any()
.and(warp::ws())
.and(warp::any().map(move || schema.clone()))
.and(warp::any().map(move || initializer.clone()))
.map(
|ws: warp::ws::Ws, schema: Schema<Query, Mutation, Subscription>, initializer: F| {
ws.on_upgrade(move |websocket| {
let (mut tx, rx) = websocket.split();
let (mut stx, srx) =
async_graphql::http::WebSocketStream::new_with_initializer(
&schema,
initializer,
)
.split();
let mut rx = rx.fuse();
let srx = srx.fuse();
async move {
futures::pin_mut!(srx);
loop {
select! {
bytes = srx.next() => {
if let Some(text) = bytes {
if tx.send(Message::text(text)).await.is_err() {
return;
}
} else {
return;
}
}
msg = rx.next() => {
if let Some(Ok(msg)) = msg {
if msg.is_text() {
if let Ok(text) = String::from_utf8(msg.into_bytes()) {
if stx.send(text).await.is_err() {
return;
}
}
}
} else {
return;
}
}
}
}
}
})
},
)
.map(|reply| warp::reply::with_header(reply, "Sec-WebSocket-Protocol", "graphql-ws"))
.boxed()
}
pub struct GQLResponse(async_graphql::Response);
impl From<async_graphql::Response> for GQLResponse {
fn from(resp: async_graphql::Response) -> Self {
GQLResponse(resp)
}
}
fn add_cache_control(http_resp: &mut Response, resp: &async_graphql::Response) {
if resp.is_ok() {
if let Some(cache_control) = resp.cache_control.value() {
if let Ok(value) = cache_control.parse() {
http_resp.headers_mut().insert("cache-control", value);
}
}
}
}
impl Reply for GQLResponse {
fn into_response(self) -> Response {
let mut resp = warp::reply::with_header(
warp::reply::json(&self.0),
"content-type",
"application/json",
)
.into_response();
add_cache_control(&mut resp, &self.0);
resp
}
}