175 lines
6.1 KiB
Rust
175 lines
6.1 KiB
Rust
//! Async-graphql integration with Actix-web
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#![forbid(unsafe_code)]
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mod subscription;
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pub use subscription::WSSubscription;
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use std::future::Future;
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use std::io::{self, ErrorKind};
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use std::pin::Pin;
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use actix_web::client::PayloadError;
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use actix_web::dev::{Payload, PayloadStream};
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use actix_web::http::{Method, StatusCode};
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use actix_web::{http, Error, FromRequest, HttpRequest, HttpResponse, Responder, Result};
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use futures_util::future::{self, FutureExt, Ready};
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use futures_util::{StreamExt, TryStreamExt};
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use async_graphql::http::MultipartOptions;
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use async_graphql::ParseRequestError;
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/// Extractor for GraphQL request.
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///
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/// `async_graphql::http::MultipartOptions` allows to configure extraction process.
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pub struct Request(pub async_graphql::Request);
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impl Request {
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/// Unwraps the value to `async_graphql::Request`.
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#[must_use]
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pub fn into_inner(self) -> async_graphql::Request {
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self.0
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}
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}
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type BatchToRequestMapper =
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fn(<<BatchRequest as FromRequest>::Future as Future>::Output) -> Result<Request>;
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impl FromRequest for Request {
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type Error = Error;
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type Future = future::Map<<BatchRequest as FromRequest>::Future, BatchToRequestMapper>;
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type Config = MultipartOptions;
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fn from_request(req: &HttpRequest, payload: &mut Payload<PayloadStream>) -> Self::Future {
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BatchRequest::from_request(req, payload).map(|res| {
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Ok(Self(
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res?.0
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.into_single()
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.map_err(actix_web::error::ErrorBadRequest)?,
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))
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})
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}
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}
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/// Extractor for GraphQL batch request.
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///
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/// `async_graphql::http::MultipartOptions` allows to configure extraction process.
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pub struct BatchRequest(pub async_graphql::BatchRequest);
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impl BatchRequest {
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/// Unwraps the value to `async_graphql::BatchRequest`.
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#[must_use]
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pub fn into_inner(self) -> async_graphql::BatchRequest {
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self.0
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}
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}
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impl FromRequest for BatchRequest {
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type Error = Error;
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type Future = Pin<Box<dyn Future<Output = Result<BatchRequest>>>>;
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type Config = MultipartOptions;
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fn from_request(req: &HttpRequest, payload: &mut Payload<PayloadStream>) -> Self::Future {
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let config = req.app_data::<Self::Config>().cloned().unwrap_or_default();
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if req.method() == Method::GET {
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let res = serde_urlencoded::from_str(req.query_string());
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Box::pin(async move { Ok(Self(async_graphql::BatchRequest::Single(res?))) })
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} else if req.method() == Method::POST {
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let content_type = req
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.headers()
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.get(http::header::CONTENT_TYPE)
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.and_then(|value| value.to_str().ok())
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.map(|value| value.to_string());
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let (tx, rx) = async_channel::bounded(16);
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// Payload is !Send so we create indirection with a channel
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let mut payload = payload.take();
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actix::spawn(async move {
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while let Some(item) = payload.next().await {
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if tx.send(item).await.is_err() {
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return;
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}
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}
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});
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Box::pin(async move {
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Ok(BatchRequest(
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async_graphql::http::receive_batch_body(
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content_type,
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rx.map_err(|e| match e {
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PayloadError::Incomplete(Some(e)) | PayloadError::Io(e) => e,
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PayloadError::Incomplete(None) => {
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io::Error::from(ErrorKind::UnexpectedEof)
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}
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PayloadError::EncodingCorrupted => io::Error::new(
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ErrorKind::InvalidData,
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"cannot decode content-encoding",
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),
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PayloadError::Overflow => io::Error::new(
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ErrorKind::InvalidData,
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"a payload reached size limit",
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),
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PayloadError::UnknownLength => {
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io::Error::new(ErrorKind::Other, "a payload length is unknown")
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}
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PayloadError::Http2Payload(e) if e.is_io() => e.into_io().unwrap(),
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PayloadError::Http2Payload(e) => io::Error::new(ErrorKind::Other, e),
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})
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.into_async_read(),
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config,
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)
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.await
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.map_err(|err| match err {
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ParseRequestError::PayloadTooLarge => {
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actix_web::error::ErrorPayloadTooLarge(err)
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}
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_ => actix_web::error::ErrorBadRequest(err),
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})?,
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))
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})
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} else {
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Box::pin(async move {
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Err(actix_web::error::ErrorMethodNotAllowed(
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"GraphQL only supports GET and POST requests",
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))
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})
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}
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}
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}
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/// Responder for a GraphQL response.
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///
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/// This contains a batch response, but since regular responses are a type of batch response it
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/// works for both.
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pub struct Response(pub async_graphql::BatchResponse);
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impl From<async_graphql::Response> for Response {
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fn from(resp: async_graphql::Response) -> Self {
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Self(resp.into())
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}
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}
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impl From<async_graphql::BatchResponse> for Response {
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fn from(resp: async_graphql::BatchResponse) -> Self {
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Self(resp)
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}
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}
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impl Responder for Response {
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type Error = Error;
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type Future = Ready<Result<HttpResponse>>;
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fn respond_to(self, _req: &HttpRequest) -> Self::Future {
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let mut res = HttpResponse::build(StatusCode::OK);
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res.content_type("application/json");
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if self.0.is_ok() {
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if let Some(cache_control) = self.0.cache_control().value() {
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res.header("cache-control", cache_control);
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}
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}
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futures_util::future::ok(res.body(serde_json::to_string(&self.0).unwrap()))
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}
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}
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