| use crate::stream::stream::inspect; |
| use core::fmt; |
| use core::pin::Pin; |
| use futures_core::stream::{FusedStream, Stream, TryStream}; |
| use futures_core::task::{Context, Poll}; |
| #[cfg(feature = "sink")] |
| use futures_sink::Sink; |
| use pin_utils::{unsafe_pinned, unsafe_unpinned}; |
| |
| /// Stream for the [`inspect_ok`](super::TryStreamExt::inspect_ok) method. |
| #[must_use = "streams do nothing unless polled"] |
| pub struct InspectOk<St, F> { |
| stream: St, |
| f: F, |
| } |
| |
| impl<St: Unpin, F> Unpin for InspectOk<St, F> {} |
| |
| impl<St, F> fmt::Debug for InspectOk<St, F> |
| where |
| St: fmt::Debug, |
| { |
| fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { |
| f.debug_struct("InspectOk") |
| .field("stream", &self.stream) |
| .finish() |
| } |
| } |
| |
| impl<St, F> InspectOk<St, F> { |
| unsafe_pinned!(stream: St); |
| unsafe_unpinned!(f: F); |
| } |
| |
| impl<St, F> InspectOk<St, F> |
| where |
| St: TryStream, |
| F: FnMut(&St::Ok), |
| { |
| pub(super) fn new(stream: St, f: F) -> Self { |
| Self { stream, f } |
| } |
| |
| /// Acquires a reference to the underlying stream that this combinator is |
| /// pulling from. |
| pub fn get_ref(&self) -> &St { |
| &self.stream |
| } |
| |
| /// Acquires a mutable reference to the underlying stream that this |
| /// combinator is pulling from. |
| /// |
| /// Note that care must be taken to avoid tampering with the state of the |
| /// stream which may otherwise confuse this combinator. |
| pub fn get_mut(&mut self) -> &mut St { |
| &mut self.stream |
| } |
| |
| /// Acquires a pinned mutable reference to the underlying stream that this |
| /// combinator is pulling from. |
| /// |
| /// Note that care must be taken to avoid tampering with the state of the |
| /// stream which may otherwise confuse this combinator. |
| pub fn get_pin_mut(self: Pin<&mut Self>) -> Pin<&mut St> { |
| self.stream() |
| } |
| |
| /// Consumes this combinator, returning the underlying stream. |
| /// |
| /// Note that this may discard intermediate state of this combinator, so |
| /// care should be taken to avoid losing resources when this is called. |
| pub fn into_inner(self) -> St { |
| self.stream |
| } |
| } |
| |
| impl<St, F> FusedStream for InspectOk<St, F> |
| where |
| St: TryStream + FusedStream, |
| F: FnMut(&St::Ok), |
| { |
| fn is_terminated(&self) -> bool { |
| self.stream.is_terminated() |
| } |
| } |
| |
| impl<St, F> Stream for InspectOk<St, F> |
| where |
| St: TryStream, |
| F: FnMut(&St::Ok), |
| { |
| type Item = Result<St::Ok, St::Error>; |
| |
| fn poll_next( |
| mut self: Pin<&mut Self>, |
| cx: &mut Context<'_>, |
| ) -> Poll<Option<Self::Item>> { |
| self.as_mut() |
| .stream() |
| .try_poll_next(cx) |
| .map(|opt| opt.map(|res| res.map(|e| inspect(e, self.as_mut().f())))) |
| } |
| |
| fn size_hint(&self) -> (usize, Option<usize>) { |
| self.stream.size_hint() |
| } |
| } |
| |
| // Forwarding impl of Sink from the underlying stream |
| #[cfg(feature = "sink")] |
| impl<S, F, Item> Sink<Item> for InspectOk<S, F> |
| where |
| S: Sink<Item>, |
| { |
| type Error = S::Error; |
| |
| delegate_sink!(stream, Item); |
| } |