http_body_util/combinators/
map_frame.rs

1use bytes::Buf;
2use http_body::{Body, Frame};
3use pin_project_lite::pin_project;
4use std::{
5    any::type_name,
6    fmt,
7    pin::Pin,
8    task::{Context, Poll},
9};
10
11pin_project! {
12    /// Body returned by the [`map_frame`] combinator.
13    ///
14    /// [`map_frame`]: crate::BodyExt::map_frame
15    #[derive(Clone, Copy)]
16    pub struct MapFrame<B, F> {
17        #[pin]
18        inner: B,
19        f: F
20    }
21}
22
23impl<B, F> MapFrame<B, F> {
24    #[inline]
25    pub(crate) fn new(body: B, f: F) -> Self {
26        Self { inner: body, f }
27    }
28
29    /// Get a reference to the inner body
30    pub fn get_ref(&self) -> &B {
31        &self.inner
32    }
33
34    /// Get a mutable reference to the inner body
35    pub fn get_mut(&mut self) -> &mut B {
36        &mut self.inner
37    }
38
39    /// Get a pinned mutable reference to the inner body
40    pub fn get_pin_mut(self: Pin<&mut Self>) -> Pin<&mut B> {
41        self.project().inner
42    }
43
44    /// Consume `self`, returning the inner body
45    pub fn into_inner(self) -> B {
46        self.inner
47    }
48}
49
50impl<B, F, B2> Body for MapFrame<B, F>
51where
52    B: Body,
53    F: FnMut(Frame<B::Data>) -> Frame<B2>,
54    B2: Buf,
55{
56    type Data = B2;
57    type Error = B::Error;
58
59    fn poll_frame(
60        self: Pin<&mut Self>,
61        cx: &mut Context<'_>,
62    ) -> Poll<Option<Result<Frame<Self::Data>, Self::Error>>> {
63        let this = self.project();
64        match this.inner.poll_frame(cx) {
65            Poll::Pending => Poll::Pending,
66            Poll::Ready(None) => Poll::Ready(None),
67            Poll::Ready(Some(Ok(frame))) => Poll::Ready(Some(Ok((this.f)(frame)))),
68            Poll::Ready(Some(Err(err))) => Poll::Ready(Some(Err(err))),
69        }
70    }
71
72    fn is_end_stream(&self) -> bool {
73        self.inner.is_end_stream()
74    }
75}
76
77impl<B, F> fmt::Debug for MapFrame<B, F>
78where
79    B: fmt::Debug,
80{
81    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
82        f.debug_struct("MapFrame")
83            .field("inner", &self.inner)
84            .field("f", &type_name::<F>())
85            .finish()
86    }
87}
http_body_util/combinators/map_frame.rs

http_body_util/combinators/
map_frame.rs
