apollo-router 1.61.13

A configurable, high-performance routing runtime for Apollo Federation 🚀
Documentation 
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#![allow(deprecated)]
use std::fmt::Debug;

use bytes::Bytes;
use futures::FutureExt;
use futures::Stream;
use futures::future::BoxFuture;
use http_body::SizeHint;
use hyper::body::HttpBody;
use tower::BoxError;
use tower::Service;

pub struct RouterBody(super::Body);

impl RouterBody {
    pub fn empty() -> Self {
        Self(super::Body::empty())
    }

    pub fn into_inner(self) -> super::Body {
        self.0
    }

    pub async fn to_bytes(self) -> Result<Bytes, hyper::Error> {
        hyper::body::to_bytes(self.0).await
    }

    pub fn wrap_stream<S, O, E>(stream: S) -> RouterBody
    where
        S: Stream<Item = Result<O, E>> + Send + 'static,
        O: Into<Bytes> + 'static,
        E: Into<Box<dyn std::error::Error + Send + Sync>> + 'static,
    {
        Self(super::Body::wrap_stream(stream))
    }
}

impl<T: Into<super::Body>> From<T> for RouterBody {
    fn from(value: T) -> Self {
        RouterBody(value.into())
    }
}

impl Debug for RouterBody {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        self.0.fmt(f)
    }
}

impl Stream for RouterBody {
    type Item = <hyper::body::Body as Stream>::Item;

    fn poll_next(
        mut self: std::pin::Pin<&mut Self>,
        cx: &mut std::task::Context<'_>,
    ) -> std::task::Poll<Option<Self::Item>> {
        let mut pinned = std::pin::pin!(&mut self.0);
        pinned.as_mut().poll_next(cx)
    }
}

impl HttpBody for RouterBody {
    type Data = <hyper::body::Body as HttpBody>::Data;

    type Error = <hyper::body::Body as HttpBody>::Error;

    fn poll_data(
        mut self: std::pin::Pin<&mut Self>,
        cx: &mut std::task::Context<'_>,
    ) -> std::task::Poll<Option<Result<Self::Data, Self::Error>>> {
        let mut pinned = std::pin::pin!(&mut self.0);
        pinned.as_mut().poll_data(cx)
    }

    fn poll_trailers(
        mut self: std::pin::Pin<&mut Self>,
        cx: &mut std::task::Context<'_>,
    ) -> std::task::Poll<Result<Option<http::HeaderMap>, Self::Error>> {
        let mut pinned = std::pin::pin!(&mut self.0);
        pinned.as_mut().poll_trailers(cx)
    }

    fn is_end_stream(&self) -> bool {
        self.0.is_end_stream()
    }

    fn size_hint(&self) -> SizeHint {
        HttpBody::size_hint(&self.0)
    }
}

pub(crate) async fn get_body_bytes<B: HttpBody>(body: B) -> Result<Bytes, B::Error> {
    hyper::body::to_bytes(body).await
}

// this is used to wrap a hyper::Client because its Service implementation will always return a hyper::Body,
// it does not keep the body type used by the request
#[derive(Clone)]
pub(crate) struct RouterBodyConverter<C> {
    pub(crate) inner: C,
}

impl<C> Service<http::Request<RouterBody>> for RouterBodyConverter<C>
where
    C: Service<http::Request<RouterBody>, Response = http::Response<super::Body>, Error = BoxError>
        + Clone
        + Send
        + Sync
        + 'static,
    <C as tower::Service<http::Request<RouterBody>>>::Future: Send + Sync + 'static,
{
    type Response = http::Response<RouterBody>;

    type Error = BoxError;

    type Future = BoxFuture<'static, Result<http::Response<RouterBody>, BoxError>>;

    fn poll_ready(
        &mut self,
        cx: &mut std::task::Context<'_>,
    ) -> std::task::Poll<Result<(), Self::Error>> {
        self.inner.poll_ready(cx)
    }

    fn call(&mut self, req: http::Request<RouterBody>) -> Self::Future {
        Box::pin(self.inner.call(req).map(|res| {
            res.map(|http_response| {
                let (parts, body) = http_response.into_parts();
                http::Response::from_parts(parts, RouterBody::from(body))
            })
        }))
    }
}