#![warn(missing_docs)]
#![allow(clippy::type_complexity)]
#![allow(clippy::needless_doctest_main)]
#![forbid(unsafe_code)]
use async_graphql::http::{multipart_stream, GQLRequest, StreamBody};
use async_graphql::{
Data, FieldResult, IntoQueryBuilder, IntoQueryBuilderOpts, ObjectType, QueryBuilder,
QueryResponse, Schema, StreamResponse, SubscriptionType, WebSocketTransport,
};
use bytes::Bytes;
use futures::select;
use futures::{SinkExt, StreamExt};
use hyper::header::HeaderValue;
use hyper::{Body, Method};
use std::convert::Infallible;
use std::sync::Arc;
use warp::filters::ws::Message;
use warp::filters::BoxedFilter;
use warp::reject::Reject;
use warp::reply::Response;
use warp::{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>, QueryBuilder),)>
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: IntoQueryBuilderOpts,
) -> BoxedFilter<((Schema<Query, Mutation, Subscription>, QueryBuilder),)>
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<IntoQueryBuilderOpts>,
schema| async move {
if method == Method::GET {
let gql_request: GQLRequest =
serde_urlencoded::from_str(&query)
.map_err(|err| warp::reject::custom(BadRequest(err.into())))?;
let builder = gql_request
.into_query_builder_opts(&opts)
.await
.map_err(|err| warp::reject::custom(BadRequest(err.into())))?;
Ok::<_, Rejection>((schema, builder))
} else {
let builder = (content_type, StreamBody::new(body))
.into_query_builder_opts(&opts)
.await
.map_err(|err| warp::reject::custom(BadRequest(err.into())))?;
Ok::<_, Rejection>((schema, builder))
}
},
)
.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,
{
warp::any()
.and(warp::ws())
.and(warp::any().map(move || schema.clone()))
.map(
|ws: warp::ws::Ws, schema: Schema<Query, Mutation, Subscription>| {
ws.on_upgrade(move |websocket| {
let (mut tx, rx) = websocket.split();
let (mut stx, srx) =
schema.subscription_connection(WebSocketTransport::default());
let mut rx = rx.fuse();
let mut srx = srx.fuse();
async move {
loop {
select! {
bytes = srx.next() => {
if let Some(bytes) = bytes {
if let Ok(text) = String::from_utf8(bytes.to_vec()) {
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 stx.send(Bytes::copy_from_slice(msg.as_bytes())).await.is_err() {
return;
}
}
}
}
}
}
}
})
},
).map(|reply| {
warp::reply::with_header(reply, "Sec-WebSocket-Protocol", "graphql-ws")
})
.boxed()
}
pub fn graphql_subscription_with_data<Query, Mutation, Subscription, F>(
schema: Schema<Query, Mutation, Subscription>,
init_context_data: 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 || init_context_data.clone()))
.map(
|ws: warp::ws::Ws, schema: Schema<Query, Mutation, Subscription>, init_context_data: F| {
ws.on_upgrade(move |websocket| {
let (mut tx, rx) = websocket.split();
let (mut stx, srx) =
schema.subscription_connection(WebSocketTransport::new(init_context_data));
let mut rx = rx.fuse();
let mut srx = srx.fuse();
async move {
loop {
select! {
bytes = srx.next() => {
if let Some(bytes) = bytes {
if let Ok(text) = String::from_utf8(bytes.to_vec()) {
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 stx.send(Bytes::copy_from_slice(msg.as_bytes())).await.is_err() {
return;
}
}
}
}
}
}
}
})
},
).map(|reply| {
warp::reply::with_header(reply, "Sec-WebSocket-Protocol", "graphql-ws")
})
.boxed()
}
pub struct GQLResponse(async_graphql::Result<QueryResponse>);
impl From<async_graphql::Result<QueryResponse>> for GQLResponse {
fn from(resp: async_graphql::Result<QueryResponse>) -> Self {
GQLResponse(resp)
}
}
fn add_cache_control(http_resp: &mut Response, resp: &async_graphql::Result<QueryResponse>) {
if let Ok(QueryResponse { cache_control, .. }) = resp {
if let Some(cache_control) = 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 gql_resp = async_graphql::http::GQLResponse(self.0);
let mut resp = warp::reply::with_header(
warp::reply::json(&gql_resp),
"content-type",
"application/json",
)
.into_response();
add_cache_control(&mut resp, &gql_resp.0);
resp
}
}
pub struct GQLResponseStream(StreamResponse);
impl From<StreamResponse> for GQLResponseStream {
fn from(resp: StreamResponse) -> Self {
GQLResponseStream(resp)
}
}
impl Reply for GQLResponseStream {
fn into_response(self) -> Response {
match self.0 {
StreamResponse::Single(resp) => GQLResponse(resp).into_response(),
StreamResponse::Stream(stream) => {
let mut resp = Response::new(Body::wrap_stream(
multipart_stream(stream).map(Result::<_, Infallible>::Ok),
));
resp.headers_mut().insert(
"content-type",
HeaderValue::from_static("multipart/mixed; boundary=\"-\""),
);
resp
}
}
}
}