futures::stream

Struct MapErr

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pub struct MapErr<S, F> { /* private fields */ }
Expand description

A stream combinator which will change the error type of a stream from one type to another.

This is produced by the Stream::map_err method.

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impl<S, F> MapErr<S, F>

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pub fn get_ref(&self) -> &S

Acquires a reference to the underlying stream that this combinator is pulling from.

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pub fn get_mut(&mut self) -> &mut S

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.

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pub fn into_inner(self) -> S

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.

Trait Implementations§

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impl<S, F> Debug for MapErr<S, F>
where S: Debug, F: Debug,

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fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter. Read more
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impl<S, F> Sink for MapErr<S, F>
where S: Sink,

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type SinkItem = <S as Sink>::SinkItem

The type of value that the sink accepts.
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type SinkError = <S as Sink>::SinkError

The type of value produced by the sink when an error occurs.
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fn poll_ready( &mut self, cx: &mut Context<'_>, ) -> Result<Async<()>, <MapErr<S, F> as Sink>::SinkError>

Attempts to prepare the Sink to receive a value. Read more
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fn start_send( &mut self, item: <MapErr<S, F> as Sink>::SinkItem, ) -> Result<(), <MapErr<S, F> as Sink>::SinkError>

Begin the process of sending a value to the sink. Each call to this function must be preceded by a successful call to poll_ready which returned Ok(Async::Ready(())). Read more
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fn poll_flush( &mut self, cx: &mut Context<'_>, ) -> Result<Async<()>, <MapErr<S, F> as Sink>::SinkError>

Flush any remaining output from this sink. Read more
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fn poll_close( &mut self, cx: &mut Context<'_>, ) -> Result<Async<()>, <MapErr<S, F> as Sink>::SinkError>

Flush any remaining output and close this sink, if necessary. Read more
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impl<S, F, U> Stream for MapErr<S, F>
where S: Stream, F: FnMut(<S as Stream>::Error) -> U,

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type Item = <S as Stream>::Item

Values yielded by the stream.
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type Error = U

Errors yielded by the stream.
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fn poll_next( &mut self, cx: &mut Context<'_>, ) -> Result<Async<Option<<S as Stream>::Item>>, U>

Attempt to pull out the next value of this stream, registering the current task for wakeup if the value is not yet available, and returning None if the stream is exhausted. Read more

Auto Trait Implementations§

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impl<S, F> Freeze for MapErr<S, F>
where S: Freeze, F: Freeze,

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impl<S, F> RefUnwindSafe for MapErr<S, F>
where S: RefUnwindSafe, F: RefUnwindSafe,

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impl<S, F> Send for MapErr<S, F>
where S: Send, F: Send,

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impl<S, F> Sync for MapErr<S, F>
where S: Sync, F: Sync,

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impl<S, F> Unpin for MapErr<S, F>
where S: Unpin, F: Unpin,

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impl<S, F> UnwindSafe for MapErr<S, F>
where S: UnwindSafe, F: UnwindSafe,

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> IntoEither for T

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fn into_either(self, into_left: bool) -> Either<Self, Self> ⓘ

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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fn into_either_with<F>(self, into_left: F) -> Either<Self, Self> ⓘ
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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impl<T> SinkExt for T
where T: Sink + ?Sized,

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fn with<U, Fut, F>(self, f: F) -> With<Self, U, Fut, F>
where F: FnMut(U) -> Fut, Fut: IntoFuture<Item = Self::SinkItem>, <Fut as IntoFuture>::Error: From<Self::SinkError>, Self: Sized,

Composes a function in front of the sink. Read more
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fn with_flat_map<U, St, F>(self, f: F) -> WithFlatMap<Self, U, St, F>
where F: FnMut(U) -> St, St: Stream<Item = Self::SinkItem, Error = Self::SinkError>, Self: Sized,

Composes a function in front of the sink. Read more
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fn sink_map_err<E, F>(self, f: F) -> SinkMapErr<Self, F>
where F: FnOnce(Self::SinkError) -> E, Self: Sized,

Transforms the error returned by the sink.
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fn sink_err_into<E>(self) -> SinkErrInto<Self, E>
where Self: Sized, Self::SinkError: Into<E>,

Map this sink’s error to a different error type using the Into trait. Read more
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fn buffer(self, amt: usize) -> Buffer<Self>
where Self: Sized,

Adds a fixed-size buffer to the current sink. Read more
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fn close(self) -> Close<Self>
where Self: Sized,

Close the sink. Read more
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fn fanout<S>(self, other: S) -> Fanout<Self, S>
where Self: Sized, Self::SinkItem: Clone, S: Sink<SinkItem = Self::SinkItem, SinkError = Self::SinkError>,

Fanout items to multiple sinks. Read more
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fn flush(self) -> Flush<Self>
where Self: Sized,

Flush the sync, processing all pending items. Read more
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fn send(self, item: Self::SinkItem) -> Send<Self>
where Self: Sized,

A future that completes after the given item has been fully processed into the sink, including flushing. Read more
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fn send_all<S>(self, stream: S) -> SendAll<Self, S>
where S: Stream<Item = Self::SinkItem>, Self::SinkError: From<<S as Stream>::Error>, Self: Sized,

A future that completes after the given stream has been fully processed into the sink, including flushing. Read more
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fn left_sink<B>(self) -> Either<Self, B> ⓘ
where B: Sink<SinkItem = Self::SinkItem, SinkError = Self::SinkError>, Self: Sized,

Wrap this sink in an Either sink, making it the left-hand variant of that Either. Read more
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fn right_sink<B>(self) -> Either<B, Self> ⓘ
where B: Sink<SinkItem = Self::SinkItem, SinkError = Self::SinkError>, Self: Sized,

Wrap this stream in an Either stream, making it the right-hand variant of that Either. Read more
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impl<T> StreamExt for T
where T: Stream + ?Sized,

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fn next(self) -> StreamFuture<Self>
where Self: Sized,

Converts this stream into a Future. Read more
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fn map<U, F>(self, f: F) -> Map<Self, F>
where F: FnMut(Self::Item) -> U, Self: Sized,

Converts a stream of type T to a stream of type U. Read more
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fn map_err<U, F>(self, f: F) -> MapErr<Self, F>
where F: FnMut(Self::Error) -> U, Self: Sized,

Converts a stream of error type T to a stream of error type U. Read more
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fn filter<R, P>(self, pred: P) -> Filter<Self, R, P>
where P: FnMut(&Self::Item) -> R, R: IntoFuture<Item = bool, Error = Self::Error>, Self: Sized,

Filters the values produced by this stream according to the provided predicate. Read more
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fn filter_map<R, B, F>(self, f: F) -> FilterMap<Self, R, F>
where F: FnMut(Self::Item) -> R, R: IntoFuture<Item = Option<B>, Error = Self::Error>, Self: Sized,

Filters the values produced by this stream while simultaneously mapping them to a different type. Read more
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fn then<U, F>(self, f: F) -> Then<Self, U, F>
where F: FnMut(Result<Self::Item, Self::Error>) -> U, U: IntoFuture, Self: Sized,

Chain on a computation for when a value is ready, passing the resulting item to the provided closure f. Read more
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fn and_then<U, F>(self, f: F) -> AndThen<Self, U, F>
where F: FnMut(Self::Item) -> U, U: IntoFuture<Error = Self::Error>, Self: Sized,

Chain on a computation for when a value is ready, passing the successful results to the provided closure f. Read more
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fn or_else<U, F>(self, f: F) -> OrElse<Self, U, F>
where F: FnMut(Self::Error) -> U, U: IntoFuture<Item = Self::Item>, Self: Sized,

Chain on a computation for when an error happens, passing the erroneous result to the provided closure f. Read more
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fn collect<C>(self) -> Collect<Self, C>
where C: Default + Extend<Self::Item>, Self: Sized,

Collect all of the values of this stream into a vector, returning a future representing the result of that computation. Read more
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fn concat(self) -> Concat<Self>
where Self: Sized, Self::Item: Extend<<Self::Item as IntoIterator>::Item> + IntoIterator + Default,

Concatenate all results of a stream into a single extendable destination, returning a future representing the end result. Read more
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fn fold<T, Fut, F>(self, init: T, f: F) -> Fold<Self, Fut, T, F>
where F: FnMut(T, Self::Item) -> Fut, Fut: IntoFuture<Item = T, Error = Self::Error>, Self: Sized,

Execute an accumulating computation over a stream, collecting all the values into one final result. Read more
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fn flatten(self) -> Flatten<Self>
where Self::Item: Stream<Error = Self::Error>, Self: Sized,

Flattens a stream of streams into just one continuous stream. Read more
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fn skip_while<R, P>(self, pred: P) -> SkipWhile<Self, R, P>
where P: FnMut(&Self::Item) -> R, R: IntoFuture<Item = bool, Error = Self::Error>, Self: Sized,

Skip elements on this stream while the predicate provided resolves to true. Read more
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fn take_while<R, P>(self, pred: P) -> TakeWhile<Self, R, P>
where P: FnMut(&Self::Item) -> R, R: IntoFuture<Item = bool, Error = Self::Error>, Self: Sized,

Take elements from this stream while the predicate provided resolves to true. Read more
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fn for_each<U, F>(self, f: F) -> ForEach<Self, U, F>
where F: FnMut(Self::Item) -> U, U: IntoFuture<Item = (), Error = Self::Error>, Self: Sized,

Runs this stream to completion, executing the provided closure for each element on the stream. Read more
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fn for_each_concurrent<U, F>(self, f: F) -> ForEachConcurrent<Self, U, F>
where F: FnMut(Self::Item) -> U, U: IntoFuture<Item = (), Error = Self::Error>, Self: Sized,

Runs this stream to completion, executing the provided closure for each element on the stream. This is similar to for_each but may begin processing an element while previous elements are still being processed. Read more
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fn err_into<E>(self) -> ErrInto<Self, E>
where Self: Sized, Self::Error: Into<E>,

Map this stream’s error to a different type using the Into trait. Read more
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fn take(self, amt: u64) -> Take<Self>
where Self: Sized,

Creates a new stream of at most amt items of the underlying stream. Read more
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fn skip(self, amt: u64) -> Skip<Self>
where Self: Sized,

Creates a new stream which skips amt items of the underlying stream. Read more
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fn fuse(self) -> Fuse<Self>
where Self: Sized,

Fuse a stream such that poll will never again be called once it has finished. Read more
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fn by_ref(&mut self) -> &mut Self
where Self: Sized,

Borrows a stream, rather than consuming it. Read more
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fn catch_unwind(self) -> CatchUnwind<Self>
where Self: Sized + UnwindSafe,

Catches unwinding panics while polling the stream. Read more
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fn buffered(self, amt: usize) -> Buffered<Self>
where Self::Item: IntoFuture<Error = Self::Error>, Self: Sized,

An adaptor for creating a buffered list of pending futures. Read more
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fn buffer_unordered(self, amt: usize) -> BufferUnordered<Self>
where Self::Item: IntoFuture<Error = Self::Error>, Self: Sized,

An adaptor for creating a buffered list of pending futures (unordered). Read more
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fn zip<S>(self, other: S) -> Zip<Self, S>
where S: Stream<Error = Self::Error>, Self: Sized,

An adapter for zipping two streams together. Read more
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fn chain<S>(self, other: S) -> Chain<Self, S>
where S: Stream<Item = Self::Item, Error = Self::Error>, Self: Sized,

Adapter for chaining two stream. Read more
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fn peekable(self) -> Peekable<Self>
where Self: Sized,

Creates a new stream which exposes a peek method. Read more
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fn chunks(self, capacity: usize) -> Chunks<Self>
where Self: Sized,

An adaptor for chunking up items of the stream inside a vector. Read more
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fn select<S>(self, other: S) -> Select<Self, S>
where S: Stream<Item = Self::Item, Error = Self::Error>, Self: Sized,

Creates a stream that selects the next element from either this stream or the provided one, whichever is ready first. Read more
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fn forward<S>(self, sink: S) -> Forward<Self, S>
where S: Sink<SinkItem = Self::Item>, Self::Error: From<<S as Sink>::SinkError>, Self: Sized,

A future that completes after the given stream has been fully processed into the sink, including flushing. Read more
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fn split(self) -> (SplitSink<Self>, SplitStream<Self>)
where Self: Sized + Sink,

Splits this Stream + Sink object into separate Stream and Sink objects. Read more
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fn inspect<F>(self, f: F) -> Inspect<Self, F>
where F: FnMut(&Self::Item), Self: Sized,

Do something with each item of this stream, afterwards passing it on. Read more
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fn inspect_err<F>(self, f: F) -> InspectErr<Self, F>
where F: FnMut(&Self::Error), Self: Sized,

Do something with the error of this stream, afterwards passing it on. Read more
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fn recover<E, F>(self, f: F) -> Recover<Self, E, F>
where F: FnMut(Self::Error) -> Option<Self::Item>, Self: Sized,

Handle errors generated by this stream by converting them into Option<Self::Item>, such that a None value terminates the stream. Read more
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fn left<B>(self) -> Either<Self, B> ⓘ
where B: Stream<Item = Self::Item, Error = Self::Error>, Self: Sized,

👎Deprecated: use left_stream instead
Wrap this stream in an Either stream, making it the left-hand variant of that Either. Read more
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fn right<B>(self) -> Either<B, Self> ⓘ
where B: Stream<Item = Self::Item, Error = Self::Error>, Self: Sized,

👎Deprecated: use right_stream instead
Wrap this stream in an Either stream, making it the right-hand variant of that Either. Read more
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fn left_stream<B>(self) -> Either<Self, B> ⓘ
where B: Stream<Item = Self::Item, Error = Self::Error>, Self: Sized,

Wrap this stream in an Either stream, making it the left-hand variant of that Either. Read more
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fn right_stream<B>(self) -> Either<B, Self> ⓘ
where B: Stream<Item = Self::Item, Error = Self::Error>, Self: Sized,

Wrap this stream in an Either stream, making it the right-hand variant of that Either. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.