pub struct ReaderStream<R> {
    reader: Option<R>,
    buf: BytesMut,
    capacity: usize,
}
Expand description

Convert an AsyncRead into a Stream of byte chunks.

This stream is fused. It performs the inverse operation of StreamReader.

Example

use tokio_stream::StreamExt;
use tokio_util::io::ReaderStream;

// Create a stream of data.
let data = b"hello, world!";
let mut stream = ReaderStream::new(&data[..]);

// Read all of the chunks into a vector.
let mut stream_contents = Vec::new();
while let Some(chunk) = stream.next().await {
   stream_contents.extend_from_slice(&chunk?);
}

// Once the chunks are concatenated, we should have the
// original data.
assert_eq!(stream_contents, data);

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§reader: Option<R>§buf: BytesMut§capacity: usize

Implementations§

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impl<R: AsyncRead> ReaderStream<R>

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pub fn new(reader: R) -> Self

Convert an AsyncRead into a Stream with item type Result<Bytes, std::io::Error>.

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pub fn with_capacity(reader: R, capacity: usize) -> Self

Convert an AsyncRead into a Stream with item type Result<Bytes, std::io::Error>, with a specific read buffer initial capacity.

Trait Implementations§

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impl<R: Debug> Debug for ReaderStream<R>

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

Formats the value using the given formatter. Read more
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impl<R: AsyncRead> Stream for ReaderStream<R>

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type Item = Result<Bytes, Error>

Values yielded by the stream.
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fn poll_next( self: Pin<&mut Self>, cx: &mut Context<'_> ) -> Poll<Option<Self::Item>>

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
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fn size_hint(&self) -> (usize, Option<usize>)

Returns the bounds on the remaining length of the stream. Read more
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impl<'__pin, R> Unpin for ReaderStream<R>where __Origin<'__pin, R>: Unpin,

Auto Trait Implementations§

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impl<R> RefUnwindSafe for ReaderStream<R>where R: RefUnwindSafe,

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impl<R> Send for ReaderStream<R>where R: Send,

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impl<R> Sync for ReaderStream<R>where R: Sync,

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impl<R> UnwindSafe for ReaderStream<R>where R: UnwindSafe,

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impl<T> Any for Twhere 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 Twhere 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 Twhere 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> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
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impl<T, U> Into<U> for Twhere 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, U> TryFrom<U> for Twhere 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 Twhere 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.
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impl<S, T, E> TryStream for Swhere S: Stream<Item = Result<T, E>> + ?Sized,

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type Ok = T

The type of successful values yielded by this future
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type Error = E

The type of failures yielded by this future
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fn try_poll_next( self: Pin<&mut S>, cx: &mut Context<'_> ) -> Poll<Option<Result<<S as TryStream>::Ok, <S as TryStream>::Error>>>

Poll this TryStream as if it were a Stream. Read more
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impl<T> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
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fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more