203 lines
7.1 KiB
Rust
203 lines
7.1 KiB
Rust
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//! Async-graphql integration with Rocket
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#![warn(missing_docs)]
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#![forbid(unsafe_code)]
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use async_graphql::{
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IntoQueryBuilder, IntoQueryBuilderOpts, QueryBuilder, QueryResponse, Schema, Variables, ObjectType, SubscriptionType
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};
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use log::{error, info};
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use rocket::{
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Request, Response, State,
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data::{Data, ToByteUnit},
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fairing::{AdHoc, Fairing},
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http::{ContentType, Header, Status, hyper::header::CACHE_CONTROL},
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request::{self, FromQuery, Outcome},
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response::{self, Responder, ResponseBuilder}, data::{self, FromData}
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};
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use std::{io::Cursor, sync::Arc};
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use tokio_util::compat::Tokio02AsyncReadCompatExt;
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use yansi::Paint;
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pub struct GraphQL;
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impl GraphQL
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{
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pub fn fairing<Q, M, S>(schema: Schema<Q, M, S>) -> impl Fairing
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where
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Q: ObjectType + Send + Sync + 'static,
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M: ObjectType + Send + Sync + 'static,
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S: SubscriptionType + Send + Sync + 'static
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{
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GraphQL::attach(schema, Default::default())
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}
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pub fn fairing_with_opts<Q, M, S>(schema: Schema<Q, M, S>, opts: IntoQueryBuilderOpts) -> impl Fairing
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where
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Q: ObjectType + Send + Sync + 'static,
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M: ObjectType + Send + Sync + 'static,
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S: SubscriptionType + Send + Sync + 'static
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{
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GraphQL::attach(schema, opts)
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}
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fn attach<Q, M, S>(schema: Schema<Q, M, S>, opts: IntoQueryBuilderOpts) -> impl Fairing
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where
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Q: ObjectType + Send + Sync + 'static,
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M: ObjectType + Send + Sync + 'static,
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S: SubscriptionType + Send + Sync + 'static
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{
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AdHoc::on_attach("GraphQL", move |rocket| async move {
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let emoji = if cfg!(windows) {""} else {"📄 "};
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info!("{}{}", Paint::masked(emoji), Paint::magenta(format!("GraphQL {}:", Paint::blue(""))).wrap());
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Ok(rocket.manage(schema)
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.manage(Arc::new(opts))
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)
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})
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}
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}
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pub struct GQLRequest(pub QueryBuilder);
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impl GQLRequest {
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pub async fn execute<Q, M, S>(self, schema: &Schema<Q, M, S>) -> Result<GQLResponse, Status>
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where
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Q: ObjectType + Send + Sync + 'static,
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M: ObjectType + Send + Sync + 'static,
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S: SubscriptionType + Send + Sync + 'static
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{
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self.0.execute(schema)
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.await
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.map(GQLResponse)
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.map_err(|e| {
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error!("{}", e);
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Status::BadRequest
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})
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}
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}
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impl<'q> FromQuery<'q> for GQLRequest {
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type Error = String;
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fn from_query(query_items: request::Query) -> Result<Self, Self::Error> {
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let mut query = None;
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let mut operation_name = None;
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let mut variables = None;
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for query_item in query_items {
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let (key, value) = query_item.key_value();
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match key.as_str() {
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"query" => {
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if query.is_some() {
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return Err(r#"Multiple parameters named \"query\" found. Only one parameter by that name is allowed."#.to_string());
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} else {
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query = value.url_decode()
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.map_err(|e| e.to_string())?
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.into();
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}
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}
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"operation_name" => {
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if operation_name.is_some() {
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return Err(r#"Multiple parameters named \"operation_name\" found. Only one parameter by that name is allowed."#.to_string());
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} else {
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operation_name = value.url_decode()
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.map_err(|e| e.to_string())?
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.into();
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}
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}
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"variables" => {
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if variables.is_some() {
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return Err(r#"Multiple parameters named \"variables\" found. Only one parameter by that name is allowed."#.to_string());
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} else {
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let decoded= value.url_decode()
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.map_err(|e| e.to_string())?;
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let json_value = serde_json::from_str::<serde_json::Value>(&decoded)
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.map_err(|e| e.to_string())?;
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variables = Variables::parse_from_json(json_value)
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.map_err(|e| e.to_string())?
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.into();
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}
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}
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_ => {
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return Err(format!(r#"Extra parameter named \"{}\" found. Extra parameters are not allowed."#, key));
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}
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}
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}
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if let Some(query_source) = query {
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let mut builder = QueryBuilder::new(query_source);
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if let Some(variables) = variables {
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builder = builder.variables(variables);
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}
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if let Some(operation_name) = operation_name {
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builder = builder.operation_name(operation_name);
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}
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Ok(GQLRequest(builder))
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} else {
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Err(r#"Parameter "query" missing from request."#.to_string())
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}
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}
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}
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#[rocket::async_trait]
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impl FromData for GQLRequest {
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type Error = String;
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async fn from_data(req: &Request<'_>, data: Data) -> data::Outcome<Self, Self::Error> {
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let opts = match req.guard::<State<'_, Arc<IntoQueryBuilderOpts>>>().await {
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Outcome::Success(opts) => opts,
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Outcome::Failure(_) => return data::Outcome::Failure((Status::InternalServerError, "Missing IntoQueryBuilderOpts in State".to_string())),
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Outcome::Forward(()) => unreachable!(),
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};
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let stream = data.open(100.kibibytes());
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let builder = (req.headers().get_one("Content-Type"), stream.compat())
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.into_query_builder_opts(&opts)
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.await;
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match builder {
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Ok(builder) => data::Outcome::Success(GQLRequest(builder)),
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Err(e) => data::Outcome::Failure((Status::BadRequest, format!("{}", e))),
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}
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}
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}
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pub struct GQLResponse(pub QueryResponse);
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impl<'r> Responder<'r, 'static> for GQLResponse {
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fn respond_to(self, _: &'r Request<'_>) -> response::Result<'static> {
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let gql_resp = async_graphql::http::GQLResponse(Ok(self.0));
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let body = serde_json::to_string(&gql_resp).unwrap();
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Response::build()
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.header(ContentType::new("application", "json"))
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.status(Status::Ok)
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.sized_body(body.len(), Cursor::new(body))
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.cache_control(&gql_resp.0)
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.ok()
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}
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}
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/// Extension trait, to allow the use of `cache_control` with for example `ResponseBuilder`.
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pub trait CacheControl{
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/// Add the `async-graphql::query::QueryResponse` cache control value as header to the Rocket response.
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fn cache_control(&mut self, resp: &async_graphql::Result<QueryResponse>) -> &mut Self;
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}
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impl<'r> CacheControl for ResponseBuilder<'r> {
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fn cache_control(&mut self, resp: &async_graphql::Result<QueryResponse>) -> &mut ResponseBuilder<'r> {
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match resp {
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Ok(resp) if resp.cache_control.value().is_some() => {
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self.header(Header::new(CACHE_CONTROL.as_str(), resp.cache_control.value().unwrap()))
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}
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_ => self,
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}
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}
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}
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