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mod request;
mod session;
use crate::request::RequestWrapper;
use crate::session::WsSession;
use actix_web::http::{header, Method};
use actix_web::{web, HttpRequest, HttpResponse, Responder};
use actix_web_actors::ws;
use async_graphql::http::{playground_source, GQLHttpRequest, GQLResponse, IntoQueryBuilder};
use async_graphql::{ObjectType, QueryBuilder, Schema, SubscriptionType};
use futures::Future;
use std::pin::Pin;
use std::sync::Arc;
type BoxOnRequestFn<Query, Mutation, Subscription> = Arc<
dyn for<'a> Fn(
&HttpRequest,
QueryBuilder<Query, Mutation, Subscription>,
) -> QueryBuilder<Query, Mutation, Subscription>,
>;
pub struct HandlerBuilder<Query, Mutation, Subscription> {
schema: Schema<Query, Mutation, Subscription>,
enable_subscription: bool,
enable_ui: Option<(String, Option<String>)>,
on_request: Option<BoxOnRequestFn<Query, Mutation, Subscription>>,
}
impl<Query, Mutation, Subscription> HandlerBuilder<Query, Mutation, Subscription>
where
Query: ObjectType + Send + Sync + 'static,
Mutation: ObjectType + Send + Sync + 'static,
Subscription: SubscriptionType + Send + Sync + 'static,
{
pub fn new(schema: Schema<Query, Mutation, Subscription>) -> Self {
Self {
schema,
enable_subscription: false,
enable_ui: None,
on_request: None,
}
}
pub fn enable_ui(self, endpoint: &str, subscription_endpoint: Option<&str>) -> Self {
Self {
enable_ui: Some((
endpoint.to_string(),
subscription_endpoint.map(|s| s.to_string()),
)),
..self
}
}
pub fn enable_subscription(self) -> Self {
Self {
enable_subscription: true,
..self
}
}
pub fn on_request<
F: for<'a> Fn(
&HttpRequest,
QueryBuilder<Query, Mutation, Subscription>,
) -> QueryBuilder<Query, Mutation, Subscription>
+ 'static,
>(
self,
f: F,
) -> Self {
Self {
on_request: Some(Arc::new(f)),
..self
}
}
pub fn build(
self,
) -> impl Fn(
HttpRequest,
web::Payload,
) -> Pin<Box<dyn Future<Output = actix_web::Result<HttpResponse>>>>
+ Clone
+ 'static {
let schema = self.schema.clone();
let enable_ui = self.enable_ui;
let enable_subscription = self.enable_subscription;
let on_request = self.on_request;
move |req: HttpRequest, payload: web::Payload| {
let schema = schema.clone();
let enable_ui = enable_ui.clone();
let on_request = on_request.clone();
Box::pin(async move {
if req.method() == Method::GET {
if enable_subscription {
if let Some(s) = req.headers().get(header::UPGRADE) {
if let Ok(s) = s.to_str() {
if s.to_ascii_lowercase().contains("websocket") {
return ws::start_with_protocols(
WsSession::new(schema.clone()),
&["graphql-ws"],
&req,
payload,
);
}
}
}
}
if let Some((endpoint, subscription_endpoint)) = &enable_ui {
return Ok(HttpResponse::Ok()
.content_type("text/html; charset=utf-8")
.body(playground_source(
endpoint,
subscription_endpoint.as_deref(),
)));
}
}
if req.method() == Method::POST {
let content_type = req
.headers()
.get(header::CONTENT_TYPE)
.and_then(|value| value.to_str().ok())
.map(|s| s.to_string());
let r = RequestWrapper(content_type, payload);
r.content_type();
let mut builder = match IntoQueryBuilder::into_query_builder(r, &schema).await {
Ok(builder) => builder,
Err(err) => {
return Ok(web::Json(GQLResponse(Err(err))).respond_to(&req).await?)
}
};
let cache_control = builder.cache_control().value();
if let Some(on_request) = &on_request {
builder = on_request(&req, builder);
}
let mut resp = web::Json(GQLResponse(builder.execute().await))
.respond_to(&req)
.await?;
if let Some(cache_control) = cache_control {
resp.headers_mut().insert(
header::CACHE_CONTROL,
header::HeaderValue::from_str(&cache_control).unwrap(),
);
}
Ok(resp)
} else {
Ok(HttpResponse::MethodNotAllowed().finish())
}
})
}
}
}