Struct AsyncBincodeStream

pub struct AsyncBincodeStream<S, R, W, D> { /* private fields */ }

A wrapper around an asynchronous stream that receives and sends bincode-encoded values.

To use, provide a stream that implements both tokio::io::AsyncRead and tokio::io::AsyncWrite, and then use futures_sink::Sink to send values and futures_core::Stream to receive them.

Note that an AsyncBincodeStream must be of the type crate::AsyncDestination in order to be compatible with an AsyncBincodeReader on the remote end (recall that it requires the serialized size prefixed to the serialized data). The default is crate::SyncDestination, but these can be easily toggled between using AsyncBincodeStream::for_async.

Implementations

impl<S, R, W, D> AsyncBincodeStream<S, R, W, D>

pub fn get_ref(&self) -> &S

Gets a reference to the underlying stream.

It is inadvisable to directly read from or write to the underlying stream.

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

Gets a mutable reference to the underlying stream.

It is inadvisable to directly read from or write to the underlying stream.

pub fn into_inner(self) -> S

Unwraps this AsyncBincodeStream, returning the underlying stream.

Note that any leftover serialized data that has not yet been sent, or received data that has not yet been deserialized, is lost.

impl<S, R, W, D> AsyncBincodeStream<S, R, W, D>

pub fn for_async(self) -> AsyncBincodeStream<S, R, W, AsyncDestination>

Make this stream include the serialized data’s size before each serialized value.

This is necessary for compatability with a remote AsyncBincodeReader.

pub fn for_sync(self) -> AsyncBincodeStream<S, R, W, SyncDestination>

Make this stream only send bincode-encoded values.

This is necessary for compatability with stock bincode receivers.

impl<R, W, D> AsyncBincodeStream<TcpStream, R, W, D>

pub fn tcp_split( &mut self, ) -> (AsyncBincodeReader<ReadHalf<'_>, R>, AsyncBincodeWriter<WriteHalf<'_>, W, D>)

Split a TCP-based stream into a read half and a write half.

This is more performant than using a lock-based split like the one provided by tokio-io or futures-util since we know that reads and writes to a TcpStream can continue concurrently.

Any partially sent or received state is preserved.

Trait Implementations

impl<S: Debug, R: Debug, W: Debug, D: Debug> Debug for AsyncBincodeStream<S, R, W, D>

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

Formats the value using the given formatter.

impl<S, R, W> Default for AsyncBincodeStream<S, R, W, SyncDestination>

where S: Default,

fn default() -> Self

Returns the “default value” for a type.

impl<S, R, W> From<S> for AsyncBincodeStream<S, R, W, SyncDestination>

fn from(stream: S) -> Self

Converts to this type from the input type.

impl<S, R, W, D> Sink<W> for AsyncBincodeStream<S, R, W, D>

where S: Unpin, AsyncBincodeWriter<S, W, D>: Sink<W, Error = EncodeError>,

type Error = EncodeError

The type of value produced by the sink when an error occurs.

fn poll_ready( self: Pin<&mut Self>, cx: &mut Context<'_>, ) -> Poll<Result<(), Self::Error>>

Attempts to prepare the Sink to receive a value.

fn start_send(self: Pin<&mut Self>, item: W) -> Result<(), Self::Error>

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 Poll::Ready(Ok(())).

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

Flush any remaining output from this sink.

fn poll_close( self: Pin<&mut Self>, cx: &mut Context<'_>, ) -> Poll<Result<(), Self::Error>>

Flush any remaining output and close this sink, if necessary.

impl<S, R, W, D> Stream for AsyncBincodeStream<S, R, W, D>

where S: Unpin, AsyncBincodeReader<InternalAsyncWriter<S, W, D>, R>: Stream<Item = Result<R, DecodeError>>,

type Item = Result<R, DecodeError>

Values yielded by the stream.

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.

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

Returns the bounds on the remaining length of the stream.