Struct tokio_util::io::SyncIoBridge

pub struct SyncIoBridge<T> { /* private fields */ }

Available on crate features io-util and io only.

Use a tokio::io::AsyncRead synchronously as a std::io::Read or a tokio::io::AsyncWrite as a std::io::Write.

Implementations

impl<T: AsyncWrite> SyncIoBridge<T>

pub fn is_write_vectored(&self) -> bool

Determines if the underlying tokio::io::AsyncWrite target supports efficient vectored writes.

See tokio::io::AsyncWrite::is_write_vectored.

impl<T: AsyncWrite + Unpin> SyncIoBridge<T>

pub fn shutdown(&mut self) -> Result<()>

Shutdown this writer. This method provides a way to call the AsyncWriteExt::shutdown function of the inner tokio::io::AsyncWrite instance.

Errors

This method returns the same errors as AsyncWriteExt::shutdown.

impl<T: Unpin> SyncIoBridge<T>

pub fn new(src: T) -> Self

Use a tokio::io::AsyncRead synchronously as a std::io::Read or a tokio::io::AsyncWrite as a std::io::Write.

When this struct is created, it captures a handle to the current thread’s runtime with tokio::runtime::Handle::current. It is hence OK to move this struct into a separate thread outside the runtime, as created by e.g. tokio::task::spawn_blocking.

Stated even more strongly: to make use of this bridge, you must move it into a separate thread outside the runtime. The synchronous I/O will use the underlying handle to block on the backing asynchronous source, via tokio::runtime::Handle::block_on. As noted in the documentation for that function, an attempt to block_on from an asynchronous execution context will panic.

Wrapping !Unpin types

Use e.g. SyncIoBridge::new(Box::pin(src)).

Panics

This will panic if called outside the context of a Tokio runtime.

pub fn new_with_handle(src: T, rt: Handle) -> Self

Use a tokio::io::AsyncRead synchronously as a std::io::Read or a tokio::io::AsyncWrite as a std::io::Write.

This is the same as SyncIoBridge::new, but allows passing an arbitrary handle and hence may be initially invoked outside of an asynchronous context.

pub fn into_inner(self) -> T

Consume this bridge, returning the underlying stream.

Trait Implementations

impl<T: AsyncBufRead + Unpin> BufRead for SyncIoBridge<T>

fn fill_buf(&mut self) -> Result<&[u8]>

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

fn consume(&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 read.

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

Read all bytes into buf until the delimiter byte or EOF is reached.

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

Read all bytes until a newline (the 0xA byte) is reached, and append them to the provided String buffer.

fn has_data_left(&mut self) -> Result<bool, Error>

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

Check if the underlying Read has any data left to be read.

fn split(self, byte: u8) -> Split<Self>where Self: Sized,

Returns an iterator over the contents of this reader split on the byte byte.

fn lines(self) -> Lines<Self>where Self: Sized,

Returns an iterator over the lines of this reader.

impl<T: Debug> Debug for SyncIoBridge<T>

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

Formats the value using the given formatter.

impl<T: AsyncRead + Unpin> Read for SyncIoBridge<T>

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_to_end(&mut self, buf: &mut Vec<u8>) -> Result<usize>

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

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

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

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

Read the exact number of bytes required to fill buf.

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

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

fn is_read_vectored(&self) -> bool

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

Determines if this Reader has an efficient read_vectored implementation.

fn read_buf(&mut self, buf: BorrowedCursor<'_>) -> Result<(), Error>

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

Pull some bytes from this source into the specified buffer.

fn read_buf_exact(&mut self, cursor: BorrowedCursor<'_>) -> Result<(), Error>

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

Read the exact number of bytes required to fill cursor.

fn by_ref(&mut self) -> &mut Selfwhere Self: Sized,

Creates a “by reference” adaptor for this instance of Read.

fn bytes(self) -> Bytes<Self>where Self: Sized,

Transforms this Read instance to an Iterator over its bytes.

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

Creates an adapter which will chain this stream with another.

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

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

impl<T: AsyncSeek + Unpin> Seek for SyncIoBridge<T>

fn seek(&mut self, pos: SeekFrom) -> Result<u64>

Seek to an offset, in bytes, in a stream.

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

Rewind to the beginning of a stream.

fn stream_len(&mut self) -> Result<u64, Error>

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

Returns the length of this stream (in bytes).

fn stream_position(&mut self) -> Result<u64, Error>

Returns the current seek position from the start of the stream.

impl<T: AsyncWrite + Unpin> Write for SyncIoBridge<T>

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_all(&mut self, buf: &[u8]) -> Result<()>

Attempts to write an entire buffer into this writer.

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

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

fn is_write_vectored(&self) -> bool

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

Determines if this Writer has an efficient write_vectored implementation.

fn write_all_vectored(&mut self, bufs: &mut [IoSlice<'_>]) -> Result<(), Error>

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

Attempts to write multiple buffers 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 Selfwhere Self: Sized,

Creates a “by reference” adapter for this instance of Write.