1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
use core::marker::PhantomData;
use core::pin::Pin;
use futures_core::stream::{FusedStream, Stream, TryStream};
use futures_core::task::{Context, Poll};
use futures_sink::Sink;
use pin_utils::unsafe_pinned;
#[derive(Debug)]
#[must_use = "streams do nothing unless polled"]
pub struct ErrInto<St, E> {
stream: St,
_marker: PhantomData<E>,
}
impl<St: Unpin, E> Unpin for ErrInto<St, E> {}
impl<St, E> ErrInto<St, E> {
unsafe_pinned!(stream: St);
pub(super) fn new(stream: St) -> Self {
ErrInto { stream, _marker: PhantomData }
}
}
impl<St: FusedStream, E> FusedStream for ErrInto<St, E> {
fn is_terminated(&self) -> bool {
self.stream.is_terminated()
}
}
impl<St, E> Stream for ErrInto<St, E>
where
St: TryStream,
St::Error: Into<E>,
{
type Item = Result<St::Ok, E>;
fn poll_next(
self: Pin<&mut Self>,
cx: &mut Context<'_>,
) -> Poll<Option<Self::Item>> {
self.stream().try_poll_next(cx)
.map(|res| res.map(|some| some.map_err(Into::into)))
}
}
impl<S, E, Item> Sink<Item> for ErrInto<S, E>
where
S: TryStream + Sink<Item>,
S::Error: Into<E>,
{
type SinkError = S::SinkError;
delegate_sink!(stream, Item);
}