405 lines
14 KiB
Rust
405 lines
14 KiB
Rust
#![doc(html_root_url = "https://docs.rs/juniper_hyper/0.2.0")]
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#[cfg(test)]
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extern crate reqwest;
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use futures::future::Either;
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use hyper::header::HeaderValue;
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use hyper::rt::Stream;
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use hyper::{header, Body, Method, Request, Response, StatusCode};
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use juniper::http::GraphQLRequest as JuniperGraphQLRequest;
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use juniper::serde::Deserialize;
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use juniper::{DefaultScalarValue, GraphQLType, InputValue, RootNode, ScalarRefValue, ScalarValue};
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use serde_json::error::Error as SerdeError;
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use std::error::Error;
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use std::fmt;
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use std::string::FromUtf8Error;
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use std::sync::Arc;
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use tokio::prelude::*;
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use url::form_urlencoded;
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pub fn graphql<CtxT, QueryT, MutationT, S>(
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root_node: Arc<RootNode<'static, QueryT, MutationT, S>>,
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context: Arc<CtxT>,
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request: Request<Body>,
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) -> impl Future<Item = Response<Body>, Error = hyper::Error>
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where
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S: ScalarValue + Send + Sync + 'static,
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for<'b> &'b S: ScalarRefValue<'b>,
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CtxT: Send + Sync + 'static,
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QueryT: GraphQLType<S, Context = CtxT> + Send + Sync + 'static,
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MutationT: GraphQLType<S, Context = CtxT> + Send + Sync + 'static,
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QueryT::TypeInfo: Send + Sync,
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MutationT::TypeInfo: Send + Sync,
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{
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match request.method() {
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&Method::GET => Either::A(Either::A(
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future::done(
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request
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.uri()
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.query()
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.map(|q| gql_request_from_get(q).map(GraphQLRequest::Single))
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.unwrap_or_else(|| {
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Err(GraphQLRequestError::Invalid(
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"'query' parameter is missing".to_string(),
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))
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}),
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)
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.and_then(move |gql_req| {
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execute_request(root_node, context, gql_req).map_err(|_| {
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unreachable!("thread pool has shut down?!");
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})
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})
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.or_else(|err| future::ok(render_error(err))),
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)),
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&Method::POST => Either::A(Either::B(
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request
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.into_body()
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.concat2()
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.or_else(|err| future::done(Err(GraphQLRequestError::BodyHyper(err))))
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.and_then(move |chunk| {
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future::done({
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String::from_utf8(chunk.iter().cloned().collect::<Vec<u8>>())
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.map_err(GraphQLRequestError::BodyUtf8)
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.and_then(|input| {
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serde_json::from_str::<GraphQLRequest<S>>(&input)
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.map_err(GraphQLRequestError::BodyJSONError)
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})
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})
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})
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.and_then(move |gql_req| {
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execute_request(root_node, context, gql_req).map_err(|_| {
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unreachable!("thread pool has shut down?!");
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})
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})
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.or_else(|err| future::ok(render_error(err))),
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)),
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_ => return Either::B(future::ok(new_response(StatusCode::METHOD_NOT_ALLOWED))),
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}
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}
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pub fn graphiql(
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graphql_endpoint: &str,
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) -> impl Future<Item = Response<Body>, Error = hyper::Error> {
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let mut resp = new_html_response(StatusCode::OK);
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// XXX: is the call to graphiql_source blocking?
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*resp.body_mut() = Body::from(juniper::graphiql::graphiql_source(graphql_endpoint));
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future::ok(resp)
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}
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pub fn playground(
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graphql_endpoint: &str,
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) -> impl Future<Item = Response<Body>, Error = hyper::Error> {
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let mut resp = new_html_response(StatusCode::OK);
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*resp.body_mut() = Body::from(juniper::http::playground::playground_source(
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graphql_endpoint,
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));
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future::ok(resp)
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}
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fn render_error(err: GraphQLRequestError) -> Response<Body> {
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let message = format!("{}", err);
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let mut resp = new_response(StatusCode::BAD_REQUEST);
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*resp.body_mut() = Body::from(message);
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resp
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}
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fn execute_request<CtxT, QueryT, MutationT, S>(
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root_node: Arc<RootNode<'static, QueryT, MutationT, S>>,
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context: Arc<CtxT>,
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request: GraphQLRequest<S>,
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) -> impl Future<Item = Response<Body>, Error = tokio_threadpool::BlockingError>
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where
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S: ScalarValue + Send + Sync + 'static,
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for<'b> &'b S: ScalarRefValue<'b>,
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CtxT: Send + Sync + 'static,
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QueryT: GraphQLType<S, Context = CtxT> + Send + Sync + 'static,
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MutationT: GraphQLType<S, Context = CtxT> + Send + Sync + 'static,
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QueryT::TypeInfo: Send + Sync,
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MutationT::TypeInfo: Send + Sync,
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{
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request.execute(root_node, context).map(|(is_ok, body)| {
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let code = if is_ok {
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StatusCode::OK
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} else {
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StatusCode::BAD_REQUEST
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};
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let mut resp = new_response(code);
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resp.headers_mut().insert(
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header::CONTENT_TYPE,
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HeaderValue::from_static("application/json"),
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);
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*resp.body_mut() = body;
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resp
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})
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}
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fn gql_request_from_get<S>(input: &str) -> Result<JuniperGraphQLRequest<S>, GraphQLRequestError>
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where
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S: ScalarValue,
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{
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let mut query = None;
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let operation_name = None;
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let mut variables = None;
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for (key, value) in form_urlencoded::parse(input.as_bytes()).into_owned() {
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match key.as_ref() {
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"query" => {
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if query.is_some() {
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return Err(invalid_err("query"));
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}
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query = Some(value)
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}
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"operationName" => {
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if operation_name.is_some() {
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return Err(invalid_err("operationName"));
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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(invalid_err("variables"));
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}
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match serde_json::from_str::<InputValue<S>>(&value)
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.map_err(GraphQLRequestError::Variables)
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{
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Ok(parsed_variables) => variables = Some(parsed_variables),
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Err(e) => return Err(e),
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}
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}
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_ => continue,
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}
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}
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match query {
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Some(query) => Ok(JuniperGraphQLRequest::new(query, operation_name, variables)),
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None => Err(GraphQLRequestError::Invalid(
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"'query' parameter is missing".to_string(),
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)),
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}
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}
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fn invalid_err(parameter_name: &str) -> GraphQLRequestError {
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GraphQLRequestError::Invalid(format!(
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"'{}' parameter is specified multiple times",
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parameter_name
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))
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}
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fn new_response(code: StatusCode) -> Response<Body> {
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let mut r = Response::new(Body::empty());
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*r.status_mut() = code;
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r
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}
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fn new_html_response(code: StatusCode) -> Response<Body> {
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let mut resp = new_response(code);
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resp.headers_mut().insert(
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header::CONTENT_TYPE,
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HeaderValue::from_static("text/html; charset=utf-8"),
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);
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resp
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}
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#[derive(serde_derive::Deserialize)]
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#[serde(untagged)]
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#[serde(bound = "InputValue<S>: Deserialize<'de>")]
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enum GraphQLRequest<S = DefaultScalarValue>
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where
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S: ScalarValue,
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{
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Single(JuniperGraphQLRequest<S>),
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Batch(Vec<JuniperGraphQLRequest<S>>),
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}
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impl<S> GraphQLRequest<S>
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where
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S: ScalarValue,
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for<'b> &'b S: ScalarRefValue<'b>,
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{
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fn execute<'a, CtxT: 'a, QueryT, MutationT>(
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self,
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root_node: Arc<RootNode<'a, QueryT, MutationT, S>>,
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context: Arc<CtxT>,
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) -> impl Future<Item = (bool, hyper::Body), Error = tokio_threadpool::BlockingError> + 'a
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where
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S: 'a,
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QueryT: GraphQLType<S, Context = CtxT> + 'a,
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MutationT: GraphQLType<S, Context = CtxT> + 'a,
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{
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match self {
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GraphQLRequest::Single(request) => Either::A(future::poll_fn(move || {
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let res = futures::try_ready!(tokio_threadpool::blocking(
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|| request.execute(&root_node, &context)
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));
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let is_ok = res.is_ok();
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let body = Body::from(serde_json::to_string_pretty(&res).unwrap());
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Ok(Async::Ready((is_ok, body)))
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})),
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GraphQLRequest::Batch(requests) => {
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Either::B(
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future::join_all(requests.into_iter().map(move |request| {
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// TODO: these clones are sad
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let root_node = root_node.clone();
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let context = context.clone();
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future::poll_fn(move || {
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let res = futures::try_ready!(tokio_threadpool::blocking(
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|| request.execute(&root_node, &context)
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));
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let is_ok = res.is_ok();
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let body = serde_json::to_string_pretty(&res).unwrap();
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Ok(Async::Ready((is_ok, body)))
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})
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}))
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.map(|results| {
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let is_ok = results.iter().all(|&(is_ok, _)| is_ok);
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// concatenate json bodies as array
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// TODO: maybe use Body chunks instead?
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let bodies: Vec<_> = results.into_iter().map(|(_, body)| body).collect();
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let body = hyper::Body::from(format!("[{}]", bodies.join(",")));
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(is_ok, body)
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}),
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)
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}
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}
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}
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}
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#[derive(Debug)]
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enum GraphQLRequestError {
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BodyHyper(hyper::Error),
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BodyUtf8(FromUtf8Error),
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BodyJSONError(SerdeError),
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Variables(SerdeError),
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Invalid(String),
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}
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impl fmt::Display for GraphQLRequestError {
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fn fmt(&self, mut f: &mut fmt::Formatter) -> fmt::Result {
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match *self {
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GraphQLRequestError::BodyHyper(ref err) => fmt::Display::fmt(err, &mut f),
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GraphQLRequestError::BodyUtf8(ref err) => fmt::Display::fmt(err, &mut f),
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GraphQLRequestError::BodyJSONError(ref err) => fmt::Display::fmt(err, &mut f),
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GraphQLRequestError::Variables(ref err) => fmt::Display::fmt(err, &mut f),
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GraphQLRequestError::Invalid(ref err) => fmt::Display::fmt(err, &mut f),
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}
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}
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}
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impl Error for GraphQLRequestError {
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fn description(&self) -> &str {
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match *self {
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GraphQLRequestError::BodyHyper(ref err) => err.description(),
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GraphQLRequestError::BodyUtf8(ref err) => err.description(),
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GraphQLRequestError::BodyJSONError(ref err) => err.description(),
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GraphQLRequestError::Variables(ref err) => err.description(),
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GraphQLRequestError::Invalid(ref err) => err,
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}
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}
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fn cause(&self) -> Option<&Error> {
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match *self {
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GraphQLRequestError::BodyHyper(ref err) => Some(err),
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GraphQLRequestError::BodyUtf8(ref err) => Some(err),
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GraphQLRequestError::BodyJSONError(ref err) => Some(err),
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GraphQLRequestError::Variables(ref err) => Some(err),
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GraphQLRequestError::Invalid(_) => None,
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}
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}
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}
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#[cfg(test)]
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mod tests {
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use futures::{future, future::Either, Future};
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use hyper::service::service_fn;
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use hyper::Method;
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use hyper::{Body, Response, Server, StatusCode};
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use juniper::http::tests as http_tests;
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use juniper::tests::model::Database;
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use juniper::tests::schema::Query;
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use juniper::EmptyMutation;
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use juniper::RootNode;
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use reqwest;
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use reqwest::Response as ReqwestResponse;
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use std::sync::Arc;
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use std::thread;
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use std::time;
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use tokio::runtime::Runtime;
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struct TestHyperIntegration;
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impl http_tests::HTTPIntegration for TestHyperIntegration {
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fn get(&self, url: &str) -> http_tests::TestResponse {
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let url = format!("http://127.0.0.1:3001/graphql{}", url);
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make_test_response(reqwest::get(&url).expect(&format!("failed GET {}", url)))
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}
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fn post(&self, url: &str, body: &str) -> http_tests::TestResponse {
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let url = format!("http://127.0.0.1:3001/graphql{}", url);
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let client = reqwest::Client::new();
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let res = client
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.post(&url)
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.body(body.to_string())
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.send()
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.expect(&format!("failed POST {}", url));
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make_test_response(res)
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}
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}
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fn make_test_response(mut response: ReqwestResponse) -> http_tests::TestResponse {
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let status_code = response.status().as_u16() as i32;
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let body = response.text().unwrap();
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let content_type_header = response.headers().get(reqwest::header::CONTENT_TYPE);
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let content_type = if let Some(ct) = content_type_header {
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format!("{}", ct.to_str().unwrap())
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} else {
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String::default()
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};
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http_tests::TestResponse {
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status_code,
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body: Some(body),
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content_type,
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}
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}
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#[test]
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fn test_hyper_integration() {
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let addr = ([127, 0, 0, 1], 3001).into();
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let db = Arc::new(Database::new());
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let root_node = Arc::new(RootNode::new(Query, EmptyMutation::<Database>::new()));
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let new_service = move || {
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let root_node = root_node.clone();
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let ctx = db.clone();
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service_fn(move |req| {
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let root_node = root_node.clone();
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let ctx = ctx.clone();
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let matches = {
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let path = req.uri().path();
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match req.method() {
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&Method::POST | &Method::GET => path == "/graphql" || path == "/graphql/",
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_ => false,
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}
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};
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if matches {
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Either::A(super::graphql(root_node, ctx, req))
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} else {
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let mut response = Response::new(Body::empty());
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*response.status_mut() = StatusCode::NOT_FOUND;
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Either::B(future::ok(response))
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}
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})
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};
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let server = Server::bind(&addr)
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.serve(new_service)
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.map_err(|e| eprintln!("server error: {}", e));
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let mut runtime = Runtime::new().unwrap();
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runtime.spawn(server);
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thread::sleep(time::Duration::from_millis(10)); // wait 10ms for server to bind
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let integration = TestHyperIntegration;
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http_tests::run_http_test_suite(&integration);
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runtime.shutdown_now().wait().unwrap();
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}
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}
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