Struct tokio::io::BufStream

pub struct BufStream<RW> { /* fields omitted */ }

This is supported on feature="io-util" only.

Wraps a type that is AsyncWrite and AsyncRead, and buffers its input and output.

It can be excessively inefficient to work directly with something that implements AsyncWrite and AsyncRead. For example, every write, however small, has to traverse the syscall interface, and similarly, every read has to do the same. The BufWriter and BufReader types aid with these problems respectively, but do so in only one direction. BufStream wraps one in the other so that both directions are buffered. See their documentation for details.

Methods

impl<RW: AsyncRead + AsyncWrite> BufStream<RW>

pub fn new(stream: RW) -> BufStream<RW>

This is supported on feature="io-util" only.

Wraps a type in both BufWriter and BufReader.

See the documentation for those types and BufStream for details.

pub fn with_capacity(
    reader_capacity: usize,
    writer_capacity: usize,
    stream: RW
) -> BufStream<RW>

This is supported on feature="io-util" only.

Creates a BufStream with the specified BufReader capacity and BufWriter capacity.

See the documentation for those types and BufStream for details.

Important traits for &'_ mut F

impl<'_, F> Future for &'_ mut F where
    F: Unpin + Future + ?Sized,  type Output = <F as Future>::Output;

pub fn get_ref(&self) -> &RW

This is supported on feature="io-util" only.

Gets a reference to the underlying I/O object.

It is inadvisable to directly read from the underlying I/O object.

Important traits for &'_ mut F

impl<'_, F> Future for &'_ mut F where
    F: Unpin + Future + ?Sized,  type Output = <F as Future>::Output;

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

This is supported on feature="io-util" only.

Gets a mutable reference to the underlying I/O object.

It is inadvisable to directly read from the underlying I/O object.

Important traits for Pin<P>

impl<P> Future for Pin<P> where
    P: Unpin + DerefMut,
    <P as Deref>::Target: Future,  type Output = <<P as Deref>::Target as Future>::Output;

pub fn get_pin_mut(self: Pin<&mut Self>) -> Pin<&mut RW>

This is supported on feature="io-util" only.

Gets a pinned mutable reference to the underlying I/O object.

It is inadvisable to directly read from the underlying I/O object.

pub fn into_inner(self) -> RW

This is supported on feature="io-util" only.

Consumes this BufStream, returning the underlying I/O object.

Note that any leftover data in the internal buffer is lost.

Trait Implementations

impl<RW: AsyncRead + AsyncWrite> AsyncBufRead for BufStream<RW>

fn poll_fill_buf(self: Pin<&mut Self>, cx: &mut Context) -> Poll<Result<&[u8]>>

Attempts to return the contents of the internal buffer, filling it with more data from the inner reader if it is empty.

fn consume(self: Pin<&mut Self>, amt: usize)

Tells this buffer that amt bytes have been consumed from the buffer, so they should no longer be returned in calls to [poll_read].

impl<RW: AsyncRead + AsyncWrite> AsyncRead for BufStream<RW>

fn poll_read(
    self: Pin<&mut Self>,
    cx: &mut Context,
    buf: &mut [u8]
) -> Poll<Result<usize>>

Attempts to read from the AsyncRead into buf.

unsafe fn prepare_uninitialized_buffer(
    &self,
    buf: &mut [MaybeUninit<u8>]
) -> bool

Prepares an uninitialized buffer to be safe to pass to read. Returns true if the supplied buffer was zeroed out.

fn poll_read_buf<B: BufMut>(
    self: Pin<&mut Self>,
    cx: &mut Context,
    buf: &mut B
) -> Poll<Result<usize>> where
    Self: Sized, 

Pulls some bytes from this source into the specified BufMut, returning how many bytes were read.

impl<RW: AsyncRead + AsyncWrite> AsyncWrite for BufStream<RW>

fn poll_write(
    self: Pin<&mut Self>,
    cx: &mut Context,
    buf: &[u8]
) -> Poll<Result<usize>>

Attempt to write bytes from buf into the object.

fn poll_flush(self: Pin<&mut Self>, cx: &mut Context) -> Poll<Result<()>>

Attempts to flush the object, ensuring that any buffered data reach their destination.

fn poll_shutdown(self: Pin<&mut Self>, cx: &mut Context) -> Poll<Result<()>>

Initiates or attempts to shut down this writer, returning success when the I/O connection has completely shut down.

fn poll_write_buf<B: Buf>(
    self: Pin<&mut Self>,
    cx: &mut Context,
    buf: &mut B
) -> Poll<Result<usize, Error>> where
    Self: Sized, 

Writes a Buf into this value, returning how many bytes were written.

impl<RW: Debug> Debug for BufStream<RW>

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

Formats the value using the given formatter.

impl<RW> From<BufReader<BufWriter<RW>>> for BufStream<RW>

fn from(b: BufReader<BufWriter<RW>>) -> Self

Performs the conversion.

impl<RW> From<BufWriter<BufReader<RW>>> for BufStream<RW>

fn from(b: BufWriter<BufReader<RW>>) -> Self

Performs the conversion.

impl<'__pin, RW> Unpin for BufStream<RW> where
    __Origin<'__pin, RW>: Unpin,