mirror of
https://github.com/tokio-rs/tokio.git
synced 2025-09-25 12:00:35 +00:00
72 lines
2.6 KiB
Rust
72 lines
2.6 KiB
Rust
//! An example of hooking up stdin/stdout to a TCP stream.
|
|
//!
|
|
//! This example will connect to a socket address specified in the argument list
|
|
//! and then forward all data read on stdin to the server, printing out all data
|
|
//! received on stdout. Each line entered on stdin will be translated to a TCP
|
|
//! packet which is then sent to the remote address.
|
|
//!
|
|
//! Note that this is not currently optimized for performance, especially
|
|
//! around buffer management. Rather it's intended to show an example of
|
|
//! working with a client.
|
|
//!
|
|
//! This example can be quite useful when interacting with the other examples in
|
|
//! this repository! Many of them recommend running this as a simple "hook up
|
|
//! stdin/stdout to a server" to get up and running.
|
|
|
|
#![warn(rust_2018_idioms)]
|
|
|
|
use tokio::io::{stdin, stdout};
|
|
use tokio::net::TcpStream;
|
|
use tokio_util::codec::{BytesCodec, FramedRead, FramedWrite};
|
|
|
|
use bytes::Bytes;
|
|
use futures::{future, Sink, SinkExt, Stream, StreamExt};
|
|
use std::env;
|
|
use std::error::Error;
|
|
use std::net::SocketAddr;
|
|
|
|
#[tokio::main]
|
|
async fn main() -> Result<(), Box<dyn Error>> {
|
|
// Parse what address we're going to connect to
|
|
let args = env::args().skip(1).collect::<Vec<_>>();
|
|
let addr = args
|
|
.first()
|
|
.ok_or("this program requires at least one argument")?;
|
|
let addr = addr.parse::<SocketAddr>()?;
|
|
|
|
let stdin = FramedRead::new(stdin(), BytesCodec::new());
|
|
let stdin = stdin.map(|i| i.map(|bytes| bytes.freeze()));
|
|
let stdout = FramedWrite::new(stdout(), BytesCodec::new());
|
|
|
|
connect(&addr, stdin, stdout).await?;
|
|
|
|
Ok(())
|
|
}
|
|
|
|
pub async fn connect(
|
|
addr: &SocketAddr,
|
|
mut stdin: impl Stream<Item = Result<Bytes, std::io::Error>> + Unpin,
|
|
mut stdout: impl Sink<Bytes, Error = std::io::Error> + Unpin,
|
|
) -> Result<(), Box<dyn Error>> {
|
|
let mut stream = TcpStream::connect(addr).await?;
|
|
let (r, w) = stream.split();
|
|
let mut sink = FramedWrite::new(w, BytesCodec::new());
|
|
// filter map Result<BytesMut, Error> stream into just a Bytes stream to match stdout Sink
|
|
// on the event of an Error, log the error and end the stream
|
|
let mut stream = FramedRead::new(r, BytesCodec::new())
|
|
.filter_map(|i| match i {
|
|
//BytesMut into Bytes
|
|
Ok(i) => future::ready(Some(i.freeze())),
|
|
Err(e) => {
|
|
println!("failed to read from socket; error={e}");
|
|
future::ready(None)
|
|
}
|
|
})
|
|
.map(Ok);
|
|
|
|
match future::join(sink.send_all(&mut stdin), stdout.send_all(&mut stream)).await {
|
|
(Err(e), _) | (_, Err(e)) => Err(e.into()),
|
|
_ => Ok(()),
|
|
}
|
|
}
|