Trait Body

pub trait Body {
    type Data: Buf;
    type Error;

    // Required method
    fn poll_frame(
        self: Pin<&mut Self>,
        cx: &mut Context<'_>,
    ) -> Poll<Option<Result<Frame<Self::Data>, Self::Error>>>;

    // Provided methods
    fn is_end_stream(&self) -> bool { ... }
    fn size_hint(&self) -> SizeHint { ... }
}

Trait representing a streaming body of a Request or Response.

Individual frames are streamed via the poll_frame function, which asynchronously yields instances of Frame<Data>.

Frames can contain a data buffer of type Self::Data. Frames can also contain an optional set of trailers used to finalize the request/response exchange. This is mostly used when using the HTTP/2.0 protocol.

The size_hint function provides insight into the total number of bytes that will be streamed.

Required Associated Types

type Data: Buf

Values yielded by the Body.

type Error

The error type this Body might generate.

Required Methods

fn poll_frame( self: Pin<&mut Self>, cx: &mut Context<'_>, ) -> Poll<Option<Result<Frame<Self::Data>, Self::Error>>>

Attempt to pull out the next data buffer of this stream.

Provided Methods

fn is_end_stream(&self) -> bool

Returns true when the end of stream has been reached.

An end of stream means that poll_frame will return None.

A return value of false does not guarantee that a value will be returned from poll_frame.

fn size_hint(&self) -> SizeHint

Returns the bounds on the remaining length of the stream.

When the exact remaining length of the stream is known, the upper bound will be set and will equal the lower bound.

Implementations on Foreign Types

impl Body for String

type Data = Bytes

type Error = Infallible

fn poll_frame( self: Pin<&mut String>, _cx: &mut Context<'_>, ) -> Poll<Option<Result<Frame<<String as Body>::Data>, <String as Body>::Error>>>

fn is_end_stream(&self) -> bool

fn size_hint(&self) -> SizeHint

impl<P> Body for Pin<P>

where P: Unpin + DerefMut, <P as Deref>::Target: Body,

type Data = <<P as Deref>::Target as Body>::Data

type Error = <<P as Deref>::Target as Body>::Error

fn poll_frame( self: Pin<&mut Pin<P>>, cx: &mut Context<'_>, ) -> Poll<Option<Result<Frame<<Pin<P> as Body>::Data>, <Pin<P> as Body>::Error>>>

fn is_end_stream(&self) -> bool

fn size_hint(&self) -> SizeHint

impl<T> Body for &mut T

where T: Body + Unpin + ?Sized,

type Data = <T as Body>::Data

type Error = <T as Body>::Error

fn poll_frame( self: Pin<&mut &mut T>, cx: &mut Context<'_>, ) -> Poll<Option<Result<Frame<<&mut T as Body>::Data>, <&mut T as Body>::Error>>>

fn is_end_stream(&self) -> bool

fn size_hint(&self) -> SizeHint

impl<T> Body for Box<T>

where T: Body + Unpin + ?Sized,

type Data = <T as Body>::Data

type Error = <T as Body>::Error

fn poll_frame( self: Pin<&mut Box<T>>, cx: &mut Context<'_>, ) -> Poll<Option<Result<Frame<<Box<T> as Body>::Data>, <Box<T> as Body>::Error>>>

fn is_end_stream(&self) -> bool

fn size_hint(&self) -> SizeHint

Implementors

impl Body for BodyBytes

type Data = Bytes

type Error = BodyError

impl<B> Body for BodyStream<B>

where B: Body,

type Data = <B as Body>::Data

type Error = <B as Body>::Error

impl<B> Body for Collected<B>

where B: Buf,

type Data = B

type Error = Infallible

impl<B> Body for Limited<B>

where B: Body, <B as Body>::Error: Into<Box<dyn Error + Sync + Send>>,

type Data = <B as Body>::Data

type Error = Box<dyn Error + Sync + Send>

impl<B> Body for Request<B>

where B: Body,

type Data = <B as Body>::Data

type Error = <B as Body>::Error

impl<B> Body for Response<B>

where B: Body,

type Data = <B as Body>::Data

type Error = <B as Body>::Error

impl<B, F, B2> Body for MapFrame<B, F>

where B: Body, F: FnMut(Frame<<B as Body>::Data>) -> Frame<B2>, B2: Buf,

type Data = B2

type Error = <B as Body>::Error

impl<B, F, E> Body for MapErr<B, F>

where B: Body, F: FnMut(<B as Body>::Error) -> E,

type Data = <B as Body>::Data

type Error = E

impl<D> Body for Empty<D>

where D: Buf,

type Data = D

type Error = Infallible

impl<D> Body for Full<D>

where D: Buf,

type Data = D

type Error = Infallible

impl<D, E> Body for BoxBody<D, E>

where D: Buf,

type Data = D

type Error = E

impl<D, E> Body for UnsyncBoxBody<D, E>

where D: Buf,

type Data = D

type Error = E

impl<L, R, Data> Body for Either<L, R>

where L: Body<Data = Data>, R: Body<Data = Data>, <L as Body>::Error: Into<Box<dyn Error + Sync + Send>>, <R as Body>::Error: Into<Box<dyn Error + Sync + Send>>, Data: Buf,

type Data = Data

type Error = Box<dyn Error + Sync + Send>

impl<S, D, E> Body for StreamBody<S>

where S: Stream<Item = Result<Frame<D>, E>>, D: Buf,

type Data = D

type Error = E

impl<T, F> Body for WithTrailers<T, F>

where T: Body, F: Future<Output = Option<Result<HeaderMap, <T as Body>::Error>>>,

type Data = <T as Body>::Data

type Error = <T as Body>::Error