1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145

//! Async-graphql integration with Actix-web
#![forbid(unsafe_code)]

mod subscription;

pub use subscription::WSSubscription;

use actix_web::dev::{Payload, PayloadStream};
use actix_web::http::StatusCode;
use actix_web::{http, web, Error, FromRequest, HttpRequest, HttpResponse, Responder, Result};
use async_graphql::http::MultipartOptions;
use async_graphql::ParseRequestError;
use futures::channel::mpsc;
use futures::future::{self, FutureExt, Ready};
use futures::io::ErrorKind;
use futures::{Future, SinkExt, StreamExt, TryFutureExt, TryStreamExt};
use std::io;
use std::pin::Pin;

/// Extractor for GraphQL request.
///
/// `async_graphql::http::MultipartOptions` allows to configure extraction process.
pub struct Request(pub async_graphql::Request);

impl Request {
    /// Unwraps the value to `async_graphql::Request`.
    #[must_use]
    pub fn into_inner(self) -> async_graphql::Request {
        self.0
    }
}

type RequestMapper =
    fn(<<BatchRequest as FromRequest>::Future as Future>::Output) -> Result<Request>;

impl FromRequest for Request {
    type Error = Error;
    type Future = future::Map<<BatchRequest as FromRequest>::Future, RequestMapper>;
    type Config = MultipartOptions;

    fn from_request(req: &HttpRequest, payload: &mut Payload<PayloadStream>) -> Self::Future {
        BatchRequest::from_request(req, payload).map(|res| {
            res.and_then(|batch| {
                batch
                    .0
                    .into_single()
                    .map_err(actix_web::error::ErrorBadRequest)
            })
            .map(Self)
        })
    }
}

/// Extractor for GraphQL batch request.
///
/// `async_graphql::http::MultipartOptions` allows to configure extraction process.
pub struct BatchRequest(pub async_graphql::BatchRequest);

impl BatchRequest {
    /// Unwraps the value to `async_graphql::BatchRequest`.
    #[must_use]
    pub fn into_inner(self) -> async_graphql::BatchRequest {
        self.0
    }
}

impl FromRequest for BatchRequest {
    type Error = Error;
    type Future = Pin<Box<dyn Future<Output = Result<BatchRequest>>>>;
    type Config = MultipartOptions;

    fn from_request(req: &HttpRequest, payload: &mut Payload<PayloadStream>) -> Self::Future {
        let config = req.app_data::<Self::Config>().cloned().unwrap_or_default();

        let content_type = req
            .headers()
            .get(http::header::CONTENT_TYPE)
            .and_then(|value| value.to_str().ok())
            .map(|value| value.to_string());

        let (mut tx, rx) = mpsc::channel(16);

        // Because Payload is !Send, so forward it to mpsc::Sender
        let mut payload = web::Payload(payload.take());
        actix_rt::spawn(async move {
            while let Some(item) = payload.next().await {
                if tx.send(item).await.is_err() {
                    return;
                }
            }
        });

        Box::pin(async move {
            Ok(BatchRequest(
                async_graphql::http::receive_batch_body(
                    content_type,
                    rx.map_err(|err| io::Error::new(ErrorKind::Other, err))
                        .into_async_read(),
                    config,
                )
                .map_err(|err| match err {
                    ParseRequestError::PayloadTooLarge => {
                        actix_web::error::ErrorPayloadTooLarge(err)
                    }
                    _ => actix_web::error::ErrorBadRequest(err),
                })
                .await?,
            ))
        })
    }
}

/// Responder for a GraphQL response.
///
/// This contains a batch response, but since regular responses are a type of batch response it
/// works for both.
pub struct Response(pub async_graphql::BatchResponse);

impl From<async_graphql::Response> for Response {
    fn from(resp: async_graphql::Response) -> Self {
        Self(resp.into())
    }
}

impl From<async_graphql::BatchResponse> for Response {
    fn from(resp: async_graphql::BatchResponse) -> Self {
        Self(resp)
    }
}

impl Responder for Response {
    type Error = Error;
    type Future = Ready<Result<HttpResponse>>;

    fn respond_to(self, _req: &HttpRequest) -> Self::Future {
        let mut res = HttpResponse::build(StatusCode::OK);
        res.content_type("application/json");
        if self.0.is_ok() {
            if let Some(cache_control) = self.0.cache_control().value() {
                res.header("cache-control", cache_control);
            }
        }
        futures::future::ok(res.body(serde_json::to_string(&self.0).unwrap()))
    }
}