Struct async_net::TcpStream

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pub struct TcpStream { /* private fields */ }
Expand description

A TCP connection.

A TcpStream can be created by connecting to an endpoint or by accepting an incoming connection.

TcpStream is a bidirectional stream that implements traits [AsyncRead] and [AsyncWrite].

Cloning a TcpStream creates another handle to the same socket. The socket will be closed when all handles to it are dropped. The reading and writing portions of the connection can also be shut down individually with the shutdown() method.

The Transmission Control Protocol is specified in IETF RFC 793.

Examples

use async_net::TcpStream;
use futures_lite::prelude::*;

let mut stream = TcpStream::connect("127.0.0.1:8080").await?;
stream.write_all(b"hello").await?;

let mut buf = vec![0u8; 1024];
let n = stream.read(&mut buf).await?;

Implementations§

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impl TcpStream

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pub async fn connect<A: AsyncToSocketAddrs>(addr: A) -> Result<TcpStream>

Creates a TCP connection to the specified address.

This method will create a new TCP socket and attempt to connect it to the provided addr,

If addr yields multiple addresses, connecting will be attempted with each of the addresses until connecting to one succeeds. If none of the addresses result in a successful connection, the error from the last connect attempt is returned.

Examples

Connect to example.com:80:

use async_net::TcpStream;

let stream = TcpStream::connect("example.com:80").await?;

Connect to 127.0.0.1:8080. If that fails, then try connecting to 127.0.0.1:8081:

use async_net::{SocketAddr, TcpStream};

let addrs = [
    SocketAddr::from(([127, 0, 0, 1], 8080)),
    SocketAddr::from(([127, 0, 0, 1], 8081)),
];
let stream = TcpStream::connect(&addrs[..]).await?;
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pub fn local_addr(&self) -> Result<SocketAddr>

Returns the local address this stream is bound to.

Examples
use async_net::TcpStream;

let stream = TcpStream::connect("example.com:80").await?;
println!("Local address is {}", stream.local_addr()?);
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pub fn peer_addr(&self) -> Result<SocketAddr>

Returns the remote address this stream is connected to.

Examples
use async_net::TcpStream;

let stream = TcpStream::connect("example.com:80").await?;
println!("Connected to {}", stream.peer_addr()?);
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pub fn shutdown(&self, how: Shutdown) -> Result<()>

Shuts down the read half, write half, or both halves of this connection.

This method will cause all pending and future I/O in the given directions to return immediately with an appropriate value (see the documentation of Shutdown).

Examples
use async_net::{Shutdown, TcpStream};

let stream = TcpStream::connect("127.0.0.1:8080").await?;
stream.shutdown(Shutdown::Both)?;
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pub async fn peek(&self, buf: &mut [u8]) -> Result<usize>

Receives data without removing it from the queue.

On success, returns the number of bytes peeked.

Successive calls return the same data. This is accomplished by passing MSG_PEEK as a flag to the underlying recv system call.

Examples
use async_net::TcpStream;

let stream = TcpStream::connect("127.0.0.1:8080").await?;

let mut buf = vec![0; 1024];
let n = stream.peek(&mut buf).await?;
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pub fn nodelay(&self) -> Result<bool>

Gets the value of the TCP_NODELAY option for this socket.

If set to true, this option disables the Nagle algorithm. This means that written data is always sent as soon as possible, even if there is only a small amount of it.

When set to false, written data is buffered until there is a certain amount to send out, thereby avoiding the frequent sending of small packets.

Examples
use async_net::TcpStream;

let stream = TcpStream::connect("127.0.0.1:8080").await?;
println!("TCP_NODELAY is set to {}", stream.nodelay()?);
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pub fn set_nodelay(&self, nodelay: bool) -> Result<()>

Sets the value of the TCP_NODELAY option for this socket.

If set to true, this option disables the Nagle algorithm. This means that written data is always sent as soon as possible, even if there is only a small amount of it.

When set to false, written data is buffered until there is a certain amount to send out, thereby avoiding the frequent sending of small packets.

Examples
use async_net::TcpStream;

let stream = TcpStream::connect("127.0.0.1:8080").await?;
stream.set_nodelay(false)?;
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pub fn ttl(&self) -> Result<u32>

Gets the value of the IP_TTL option for this socket.

This option configures the time-to-live field that is used in every packet sent from this socket.

Examples
use async_net::TcpStream;

let stream = TcpStream::connect("127.0.0.1:8080").await?;
println!("IP_TTL is set to {}", stream.ttl()?);
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pub fn set_ttl(&self, ttl: u32) -> Result<()>

Sets the value of the IP_TTL option for this socket.

This option configures the time-to-live field that is used in every packet sent from this socket.

Examples
use async_net::TcpStream;

let stream = TcpStream::connect("127.0.0.1:8080").await?;
stream.set_ttl(100)?;

Trait Implementations§

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impl AsFd for TcpStream

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fn as_fd(&self) -> BorrowedFd<'_>

Borrows the file descriptor. Read more
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impl AsRawFd for TcpStream

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fn as_raw_fd(&self) -> RawFd

Extracts the raw file descriptor. Read more
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impl AsyncRead for TcpStream

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

Attempt to read from the AsyncRead into buf. Read more
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fn poll_read_vectored( self: Pin<&mut Self>, cx: &mut Context<'_>, bufs: &mut [IoSliceMut<'_>] ) -> Poll<Result<usize, Error>>

Attempt to read from the AsyncRead into bufs using vectored IO operations. Read more
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impl AsyncWrite for TcpStream

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

Attempt to write bytes from buf into the object. Read more
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fn poll_flush(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<()>>

Attempt to flush the object, ensuring that any buffered data reach their destination. Read more
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fn poll_close(self: Pin<&mut Self>, _: &mut Context<'_>) -> Poll<Result<()>>

Attempt to close the object. Read more
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fn poll_write_vectored( self: Pin<&mut Self>, cx: &mut Context<'_>, bufs: &[IoSlice<'_>] ) -> Poll<Result<usize>>

Attempt to write bytes from bufs into the object using vectored IO operations. Read more
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impl Clone for TcpStream

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fn clone(&self) -> TcpStream

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for TcpStream

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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 From<Async<TcpStream>> for TcpStream

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fn from(stream: Async<TcpStream>) -> TcpStream

Converts to this type from the input type.
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impl From<TcpStream> for Arc<Async<TcpStream>>

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fn from(val: TcpStream) -> Self

Converts to this type from the input type.
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impl TryFrom<OwnedFd> for TcpStream

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type Error = Error

The type returned in the event of a conversion error.
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fn try_from(value: OwnedFd) -> Result<Self, Self::Error>

Performs the conversion.
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impl TryFrom<TcpStream> for TcpStream

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type Error = Error

The type returned in the event of a conversion error.
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fn try_from(stream: TcpStream) -> Result<TcpStream>

Performs the conversion.
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impl RefUnwindSafe for TcpStream

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impl UnwindSafe for TcpStream

Auto Trait Implementations§

Blanket Implementations§

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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> AsSource for Twhere T: AsFd,

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fn source(&self) -> BorrowedFd<'_>

Returns the borrowed file descriptor.
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impl<R> AsyncReadExt for Rwhere R: AsyncRead + ?Sized,

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fn read<'a>(&'a mut self, buf: &'a mut [u8]) -> ReadFuture<'a, Self>where Self: Unpin,

Reads some bytes from the byte stream. Read more
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fn read_vectored<'a>( &'a mut self, bufs: &'a mut [IoSliceMut<'a>] ) -> ReadVectoredFuture<'a, Self>where Self: Unpin,

Like read(), except it reads into a slice of buffers. Read more
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fn read_to_end<'a>( &'a mut self, buf: &'a mut Vec<u8> ) -> ReadToEndFuture<'a, Self>where Self: Unpin,

Reads the entire contents and appends them to a Vec. Read more
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fn read_to_string<'a>( &'a mut self, buf: &'a mut String ) -> ReadToStringFuture<'a, Self>where Self: Unpin,

Reads the entire contents and appends them to a String. Read more
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fn read_exact<'a>(&'a mut self, buf: &'a mut [u8]) -> ReadExactFuture<'a, Self>where Self: Unpin,

Reads the exact number of bytes required to fill buf. Read more
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fn take(self, limit: u64) -> Take<Self>where Self: Sized,

Creates an adapter which will read at most limit bytes from it. Read more
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fn bytes(self) -> Bytes<Self>where Self: Sized,

Converts this [AsyncRead] into a [Stream] of bytes. Read more
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fn chain<R>(self, next: R) -> Chain<Self, R>where R: AsyncRead, Self: Sized,

Creates an adapter which will chain this stream with another. Read more
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fn boxed_reader<'a>(self) -> Pin<Box<dyn AsyncRead + Send + 'a>>where Self: Sized + Send + 'a,

Boxes the reader and changes its type to dyn AsyncRead + Send + 'a. Read more
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impl<W> AsyncWriteExt for Wwhere W: AsyncWrite + ?Sized,

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fn write<'a>(&'a mut self, buf: &'a [u8]) -> WriteFuture<'a, Self>where Self: Unpin,

Writes some bytes into the byte stream. Read more
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fn write_vectored<'a>( &'a mut self, bufs: &'a [IoSlice<'a>] ) -> WriteVectoredFuture<'a, Self>where Self: Unpin,

Like write(), except that it writes a slice of buffers. Read more
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fn write_all<'a>(&'a mut self, buf: &'a [u8]) -> WriteAllFuture<'a, Self>where Self: Unpin,

Writes an entire buffer into the byte stream. Read more
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fn flush(&mut self) -> FlushFuture<'_, Self>where Self: Unpin,

Flushes the stream to ensure that all buffered contents reach their destination. Read more
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fn close(&mut self) -> CloseFuture<'_, Self>where Self: Unpin,

Closes the writer. Read more
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fn boxed_writer<'a>(self) -> Pin<Box<dyn AsyncWrite + Send + 'a>>where Self: Sized + Send + 'a,

Boxes the writer and changes its type to dyn AsyncWrite + Send + 'a. 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> ToOwned for Twhere T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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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<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