Struct partial_io::PartialAsyncRead

pub struct PartialAsyncRead<R> { /* fields omitted */ }

A wrapper that breaks inner AsyncRead instances up according to the provided iterator.

Available with the tokio feature.

Examples

extern crate partial_io;
extern crate tokio_core;
extern crate tokio_io;

use std::io::{self, Cursor};

fn main() {
    use tokio_core::reactor::Core;
    use tokio_io::io::read as tokio_read;

    use partial_io::{PartialAsyncRead, PartialOp};

    let reader = Cursor::new(vec![1, 2, 3, 4]);
    let iter = vec![PartialOp::Err(io::ErrorKind::WouldBlock), PartialOp::Limited(2)];
    let partial_reader = PartialAsyncRead::new(reader, iter);
    let out = vec![0; 256];

    let mut core = Core::new().unwrap();

    // This future will skip over the WouldBlock and return however much was
    // successfully read the first time a read succeeded.
    let read_fut = tokio_read(partial_reader, out);

    let (_partial_reader, out, size) = core.run(read_fut).unwrap();

    assert_eq!(size, 2);
    assert_eq!(&out[..3], &[1, 2, 0]);
}

Methods

impl<R> PartialAsyncRead<R> where
    R: AsyncRead, 

pub fn new<I>(inner: R, iter: I) -> Self where
    I: IntoIterator<Item = PartialOp> + 'static,
    I::IntoIter: Send, 

Creates a new PartialAsyncRead wrapper over the reader with the specified PartialOps.

pub fn set_ops<I>(&mut self, iter: I) -> &mut Self where
    I: IntoIterator<Item = PartialOp> + 'static,
    I::IntoIter: Send, 

Sets the PartialOps for this reader.

pub fn get_ref(&self) -> &R

Acquires a reference to the underlying reader.

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

Acquires a mutable reference to the underlying reader.

pub fn into_inner(self) -> R

Consumes this wrapper, returning the underlying reader.

Trait Implementations

impl<R> Debug for PartialAsyncRead<R> where
    R: Debug, 

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

Formats the value using the given formatter.

impl<R> Write for PartialAsyncRead<R> where
    R: AsyncRead + Write, 

fn write(&mut self, buf: &[u8]) -> Result<usize>

Write a buffer into this writer, returning how many bytes were written.

fn flush(&mut self) -> Result<()>

Flush this output stream, ensuring that all intermediately buffered contents reach their destination.

fn write_vectored(&mut self, bufs: &[IoSlice]) -> Result<usize, Error>

Like write, except that it writes from a slice of buffers.

fn write_all(&mut self, buf: &[u8]) -> Result<(), Error>

Attempts to write an entire buffer into this writer.

fn write_fmt(&mut self, fmt: Arguments) -> Result<(), Error>

Writes a formatted string into this writer, returning any error encountered.

fn by_ref(&mut self) -> &mut Self

Creates a "by reference" adaptor for this instance of Write.

impl<R> Read for PartialAsyncRead<R> where
    R: AsyncRead, 

fn read(&mut self, buf: &mut [u8]) -> Result<usize>

Pull some bytes from this source into the specified buffer, returning how many bytes were read.

fn read_vectored(&mut self, bufs: &mut [IoSliceMut]) -> Result<usize, Error>

Like read, except that it reads into a slice of buffers.

unsafe fn initializer(&self) -> Initializer

🔬 This is a nightly-only experimental API. (read_initializer)

Determines if this Reader can work with buffers of uninitialized memory.

fn read_to_end(&mut self, buf: &mut Vec<u8>) -> Result<usize, Error>

Read all bytes until EOF in this source, placing them into buf.

fn read_to_string(&mut self, buf: &mut String) -> Result<usize, Error>

Read all bytes until EOF in this source, appending them to buf.

fn read_exact(&mut self, buf: &mut [u8]) -> Result<(), Error>

Read the exact number of bytes required to fill buf.

fn by_ref(&mut self) -> &mut Self

Creates a "by reference" adaptor for this instance of Read.

fn bytes(self) -> Bytes<Self>

Transforms this Read instance to an [Iterator] over its bytes.

fn chain<R>(self, next: R) -> Chain<Self, R> where
    R: Read, 

Creates an adaptor which will chain this stream with another.

fn take(self, limit: u64) -> Take<Self>

Creates an adaptor which will read at most limit bytes from it.

impl<R> AsyncWrite for PartialAsyncRead<R> where
    R: AsyncRead + AsyncWrite, 

fn shutdown(&mut self) -> Poll<(), Error>

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

fn poll_write(&mut self, buf: &[u8]) -> Result<Async<usize>, Error>

Attempt to write bytes from buf into the object.

fn poll_flush(&mut self) -> Result<Async<()>, Error>

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

fn write_buf<B>(&mut self, buf: &mut B) -> Result<Async<usize>, Error> where
    B: Buf, 

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

impl<R> AsyncRead for PartialAsyncRead<R> where
    R: AsyncRead, 

unsafe fn prepare_uninitialized_buffer(&self, buf: &mut [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(&mut self, buf: &mut [u8]) -> Result<Async<usize>, Error>

Attempt to read from the AsyncRead into buf.

fn read_buf<B>(&mut self, buf: &mut B) -> Result<Async<usize>, Error> where
    B: BufMut, 

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

fn framed<T>(self, codec: T) -> Framed<Self, T> where
    Self: AsyncWrite,
    T: Decoder + Encoder, 

Deprecated since 0.1.7:

Use tokio_codec::Decoder::framed instead

Provides a Stream and Sink interface for reading and writing to this I/O object, using Decode and Encode to read and write the raw data.

fn split(self) -> (ReadHalf<Self>, WriteHalf<Self>) where
    Self: AsyncWrite, 

Helper method for splitting this read/write object into two halves.