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use bytes::Bytes;
use futures_sink::Sink;
use pin_project_lite::pin_project;
use std::pin::Pin;
use std::task::{Context, Poll};
pin_project! {
/// A helper that wraps a [`Sink`]`<`[`Bytes`]`>` and converts it into a
/// [`Sink`]`<&'a [u8]>` by copying each byte slice into an owned [`Bytes`].
///
/// See the documentation for [`SinkWriter`] for an example.
///
/// [`Bytes`]: bytes::Bytes
/// [`SinkWriter`]: crate::io::SinkWriter
/// [`Sink`]: futures_sink::Sink
#[derive(Debug)]
pub struct CopyToBytes<S> {
#[pin]
inner: S,
}
}
impl<S> CopyToBytes<S> {
/// Creates a new [`CopyToBytes`].
pub fn new(inner: S) -> Self {
Self { inner }
}
/// Gets a reference to the underlying sink.
pub fn get_ref(&self) -> &S {
&self.inner
}
/// Gets a mutable reference to the underlying sink.
pub fn get_mut(&mut self) -> &mut S {
&mut self.inner
}
/// Consumes this [`CopyToBytes`], returning the underlying sink.
pub fn into_inner(self) -> S {
self.inner
}
}
impl<'a, S> Sink<&'a [u8]> for CopyToBytes<S>
where
S: Sink<Bytes>,
{
type Error = S::Error;
fn poll_ready(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
self.project().inner.poll_ready(cx)
}
fn start_send(self: Pin<&mut Self>, item: &'a [u8]) -> Result<(), Self::Error> {
self.project()
.inner
.start_send(Bytes::copy_from_slice(item))
}
fn poll_flush(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
self.project().inner.poll_flush(cx)
}
fn poll_close(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
self.project().inner.poll_close(cx)
}
}
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