Struct actix_rt::net::TcpStream[−][src]

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

A TCP stream between a local and a remote socket.

A TCP stream can either be created by connecting to an endpoint, via the connect method, or by accepting a connection from a listener.

Reading and writing to a TcpStream is usually done using the convenience methods found on the AsyncReadExt and AsyncWriteExt traits. Examples import these traits through the prelude.

Examples

use tokio::net::TcpStream;
use tokio::prelude::*;
use std::error::Error;

#[tokio::main]
async fn main() -> Result<(), Box<dyn Error>> {
    // Connect to a peer
    let mut stream = TcpStream::connect("127.0.0.1:8080").await?;

    // Write some data.
    stream.write_all(b"hello world!").await?;

    Ok(())
}

The write_all method is defined on the AsyncWriteExt trait.

Implementations

Opens a TCP connection to a remote host.

addr is an address of the remote host. Anything which implements the ToSocketAddrs trait can be supplied as the address. Note that strings only implement this trait when the dns feature is enabled, as strings may contain domain names that need to be resolved.

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

Examples
use tokio::net::TcpStream;
use tokio::prelude::*;
use std::error::Error;

#[tokio::main]
async fn main() -> Result<(), Box<dyn Error>> {
    // Connect to a peer
    let mut stream = TcpStream::connect("127.0.0.1:8080").await?;

    // Write some data.
    stream.write_all(b"hello world!").await?;

    Ok(())
}

Without the dns feature:

use tokio::net::TcpStream;
use tokio::prelude::*;
use std::error::Error;
use std::net::Ipv4Addr;

#[tokio::main]
async fn main() -> Result<(), Box<dyn Error>> {
    // Connect to a peer
    let mut stream = TcpStream::connect((Ipv4Addr::new(127, 0, 0, 1), 8080)).await?;

    // Write some data.
    stream.write_all(b"hello world!").await?;

    Ok(())
}

The write_all method is defined on the AsyncWriteExt trait.

Creates new TcpStream from a std::net::TcpStream.

This function will convert a TCP stream created by the standard library to a TCP stream ready to be used with the provided event loop handle.

Examples
use std::error::Error;
use tokio::net::TcpStream;

#[tokio::main]
async fn main() -> Result<(), Box<dyn Error>> {
    let std_stream = std::net::TcpStream::connect("127.0.0.1:34254")?;
    let stream = TcpStream::from_std(std_stream)?;
    Ok(())
}
Panics

This function panics if thread-local runtime is not set.

The runtime is usually set implicitly when this function is called from a future driven by a tokio runtime, otherwise runtime can be set explicitly with Handle::enter function.

Returns the local address that this stream is bound to.

Examples
use tokio::net::TcpStream;

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

println!("{:?}", stream.local_addr()?);

Returns the remote address that this stream is connected to.

Examples
use tokio::net::TcpStream;

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

println!("{:?}", stream.peer_addr()?);

Attempts to receive data on the socket, without removing that data from the queue, registering the current task for wakeup if data is not yet available.

Return value

The function returns:

  • Poll::Pending if data is not yet available.
  • Poll::Ready(Ok(n)) if data is available. n is the number of bytes peeked.
  • Poll::Ready(Err(e)) if an error is encountered.
Errors

This function may encounter any standard I/O error except WouldBlock.

Examples
use tokio::io;
use tokio::net::TcpStream;

use futures::future::poll_fn;

#[tokio::main]
async fn main() -> io::Result<()> {
    let mut stream = TcpStream::connect("127.0.0.1:8000").await?;
    let mut buf = [0; 10];

    poll_fn(|cx| {
        stream.poll_peek(cx, &mut buf)
    }).await?;

    Ok(())
}

Receives data on the socket from the remote address to which it is connected, without removing that data 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 tokio::net::TcpStream;
use tokio::prelude::*;
use std::error::Error;

#[tokio::main]
async fn main() -> Result<(), Box<dyn Error>> {
    // Connect to a peer
    let mut stream = TcpStream::connect("127.0.0.1:8080").await?;

    let mut b1 = [0; 10];
    let mut b2 = [0; 10];

    // Peek at the data
    let n = stream.peek(&mut b1).await?;

    // Read the data
    assert_eq!(n, stream.read(&mut b2[..n]).await?);
    assert_eq!(&b1[..n], &b2[..n]);

    Ok(())
}

The read method is defined on the AsyncReadExt trait.

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

This function will cause all pending and future I/O on the specified portions to return immediately with an appropriate value (see the documentation of Shutdown).

Examples
use tokio::net::TcpStream;
use std::error::Error;
use std::net::Shutdown;

#[tokio::main]
async fn main() -> Result<(), Box<dyn Error>> {
    // Connect to a peer
    let stream = TcpStream::connect("127.0.0.1:8080").await?;

    // Shutdown the stream
    stream.shutdown(Shutdown::Write)?;

    Ok(())
}

Gets the value of the TCP_NODELAY option on this socket.

For more information about this option, see set_nodelay.

Examples
use tokio::net::TcpStream;

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

println!("{:?}", stream.nodelay()?);

Sets the value of the TCP_NODELAY option on this socket.

If set, this option disables the Nagle algorithm. This means that segments are always sent as soon as possible, even if there is only a small amount of data. When not set, data is buffered until there is a sufficient amount to send out, thereby avoiding the frequent sending of small packets.

Examples
use tokio::net::TcpStream;

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

stream.set_nodelay(true)?;

Gets the value of the SO_RCVBUF option on this socket.

For more information about this option, see set_recv_buffer_size.

Examples
use tokio::net::TcpStream;

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

println!("{:?}", stream.recv_buffer_size()?);

Sets the value of the SO_RCVBUF option on this socket.

Changes the size of the operating system’s receive buffer associated with the socket.

Examples
use tokio::net::TcpStream;

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

stream.set_recv_buffer_size(100)?;

Gets the value of the SO_SNDBUF option on this socket.

For more information about this option, see set_send_buffer_size.

Examples
use tokio::net::TcpStream;

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

println!("{:?}", stream.send_buffer_size()?);

Sets the value of the SO_SNDBUF option on this socket.

Changes the size of the operating system’s send buffer associated with the socket.

Examples
use tokio::net::TcpStream;

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

stream.set_send_buffer_size(100)?;

Returns whether keepalive messages are enabled on this socket, and if so the duration of time between them.

For more information about this option, see set_keepalive.

Examples
use tokio::net::TcpStream;

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

println!("{:?}", stream.keepalive()?);

Sets whether keepalive messages are enabled to be sent on this socket.

On Unix, this option will set the SO_KEEPALIVE as well as the TCP_KEEPALIVE or TCP_KEEPIDLE option (depending on your platform). On Windows, this will set the SIO_KEEPALIVE_VALS option.

If None is specified then keepalive messages are disabled, otherwise the duration specified will be the time to remain idle before sending a TCP keepalive probe.

Some platforms specify this value in seconds, so sub-second specifications may be omitted.

Examples
use tokio::net::TcpStream;

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

stream.set_keepalive(None)?;

Gets the value of the IP_TTL option for this socket.

For more information about this option, see set_ttl.

Examples
use tokio::net::TcpStream;

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

println!("{:?}", stream.ttl()?);

Sets the value for the IP_TTL option on this socket.

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

Examples
use tokio::net::TcpStream;

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

stream.set_ttl(123)?;

Reads the linger duration for this socket by getting the SO_LINGER option.

For more information about this option, see set_linger.

Examples
use tokio::net::TcpStream;

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

println!("{:?}", stream.linger()?);

Sets the linger duration of this socket by setting the SO_LINGER option.

This option controls the action taken when a stream has unsent messages and the stream is closed. If SO_LINGER is set, the system shall block the process until it can transmit the data or until the time expires.

If SO_LINGER is not specified, and the stream is closed, the system handles the call in a way that allows the process to continue as quickly as possible.

Examples
use tokio::net::TcpStream;

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

stream.set_linger(None)?;

Splits a TcpStream into a read half and a write half, which can be used to read and write the stream concurrently.

This method is more efficient than into_split, but the halves cannot be moved into independently spawned tasks.

Splits a TcpStream into a read half and a write half, which can be used to read and write the stream concurrently.

Unlike split, the owned halves can be moved to separate tasks, however this comes at the cost of a heap allocation.

Note: Dropping the write half will shut down the write half of the TCP stream. This is equivalent to calling shutdown(Write) on the TcpStream.

Trait Implementations

Extracts the raw file descriptor. Read more

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

Attempts to read from the AsyncRead into buf. Read more

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

Attempt to write bytes from buf into the object. Read more

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

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

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

Formats the value using the given formatter. Read more

Consumes stream, returning the tokio I/O object.

This is equivalent to TcpStream::from_std(stream).

The type returned in the event of a conversion error.

Auto Trait Implementations

Blanket Implementations

Gets the TypeId of self. Read more

Creates a new AsyncRead instance that chains this stream with next. Read more

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

Pulls some bytes from this source into the specified buffer, advancing the buffer’s internal cursor. Read more

Reads the exact number of bytes required to fill buf. Read more

Reads an unsigned 8 bit integer from the underlying reader. Read more

Reads a signed 8 bit integer from the underlying reader. Read more

Reads an unsigned 16-bit integer in big-endian order from the underlying reader. Read more

Reads a signed 16-bit integer in big-endian order from the underlying reader. Read more

Reads an unsigned 32-bit integer in big-endian order from the underlying reader. Read more

Reads a signed 32-bit integer in big-endian order from the underlying reader. Read more

Reads an unsigned 64-bit integer in big-endian order from the underlying reader. Read more

Reads an signed 64-bit integer in big-endian order from the underlying reader. Read more

Reads an unsigned 128-bit integer in big-endian order from the underlying reader. Read more

Reads an signed 128-bit integer in big-endian order from the underlying reader. Read more

Reads an unsigned 16-bit integer in little-endian order from the underlying reader. Read more

Reads a signed 16-bit integer in little-endian order from the underlying reader. Read more

Reads an unsigned 32-bit integer in little-endian order from the underlying reader. Read more

Reads a signed 32-bit integer in little-endian order from the underlying reader. Read more

Reads an unsigned 64-bit integer in little-endian order from the underlying reader. Read more

Reads an signed 64-bit integer in little-endian order from the underlying reader. Read more

Reads an unsigned 128-bit integer in little-endian order from the underlying reader. Read more

Reads an signed 128-bit integer in little-endian order from the underlying reader. Read more

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

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

Creates an adaptor which reads at most limit bytes from it. Read more

Writes a buffer into this writer, returning how many bytes were written. Read more

Writes a buffer into this writer, advancing the buffer’s internal cursor. Read more

Attempts to write an entire buffer into this writer. Read more

Writes an unsigned 8-bit integer to the underlying writer. Read more

Writes an unsigned 8-bit integer to the underlying writer. Read more

Writes an unsigned 16-bit integer in big-endian order to the underlying writer. Read more

Writes a signed 16-bit integer in big-endian order to the underlying writer. Read more

Writes an unsigned 32-bit integer in big-endian order to the underlying writer. Read more

Writes a signed 32-bit integer in big-endian order to the underlying writer. Read more

Writes an unsigned 64-bit integer in big-endian order to the underlying writer. Read more

Writes an signed 64-bit integer in big-endian order to the underlying writer. Read more

Writes an unsigned 128-bit integer in big-endian order to the underlying writer. Read more

Writes an signed 128-bit integer in big-endian order to the underlying writer. Read more

Writes an unsigned 16-bit integer in little-endian order to the underlying writer. Read more

Writes a signed 16-bit integer in little-endian order to the underlying writer. Read more

Writes an unsigned 32-bit integer in little-endian order to the underlying writer. Read more

Writes a signed 32-bit integer in little-endian order to the underlying writer. Read more

Writes an unsigned 64-bit integer in little-endian order to the underlying writer. Read more

Writes an signed 64-bit integer in little-endian order to the underlying writer. Read more

Writes an unsigned 128-bit integer in little-endian order to the underlying writer. Read more

Writes an signed 128-bit integer in little-endian order to the underlying writer. Read more

Flushes this output stream, ensuring that all intermediately buffered contents reach their destination. Read more

Shuts down the output stream, ensuring that the value can be dropped cleanly. Read more

Immutably borrows from an owned value. Read more

Mutably borrows from an owned value. Read more

Performs the conversion.

Performs the conversion.

The type returned in the event of a conversion error.

Performs the conversion.

The type returned in the event of a conversion error.

Performs the conversion.