mirror of
https://github.com/tokio-rs/tokio.git
synced 2026-09-01 00:00:10 +02:00
David Kellum
c9532e49d7
* use dyn Trait syntax where appropriate recent rust nightly started warning that not using `dyn` was deprecated. This requires MSRV 1.27.0+. * rustfmt fallout from dyn additions * stop explicit allow of rust_2018_idioms * more dyn Trait syntax * drop tokio-macros from 0.1.x workspace Since tokio-macros specifies an edition=2018, we would otherwise require MSRV 1.31.0 to build/test it. And tokio-macros isn't used with tokio 0.1.x. * reactor: narrow tokio-io-pool dev dep to 0.1.4 Since 0.1.5-6 is now a edition=2018 crate, which has effective MSRV 1.31.0. * narrow tempfile dev-dep to avoid MSRV bump tempfile 3.1.0 pulls in rand 0.7.0 and is MSRV 1.32.0 * narrow flate2 dev-dep to avoid MSRV bump flate2 1.0.10-11 have MSRV 1.34.0. github refs: alexcrichton/flate2-rs#207 * fs: drop deprecated tempdir crate use in tests In particular because it pulls in old rand duplicates. Replace use with tempfile::tempdir() which has been available since tempfile 3.0.0. backport-of: #1312 * increase CI MSRV to 1.28.0
71 lines
2.0 KiB
Rust
71 lines
2.0 KiB
Rust
//! A UDP client that just sends everything it gets via `stdio` in a single datagram, and then
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//! waits for a reply.
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//!
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//! For the reasons of simplicity data from `stdio` is read until `EOF` in a blocking manner.
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//!
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//! You can test this out by running an echo server:
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//!
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//! ```
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//! $ cargo run --example echo-udp -- 127.0.0.1:8080
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//! ```
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//!
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//! and running the client in another terminal:
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//!
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//! ```
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//! $ cargo run --example udp-client
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//! ```
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//!
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//! You can optionally provide any custom endpoint address for the client:
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//!
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//! ```
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//! $ cargo run --example udp-client -- 127.0.0.1:8080
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//! ```
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//!
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//! Don't forget to pass `EOF` to the standard input of the client!
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//!
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//! Please mind that since the UDP protocol doesn't have any capabilities to detect a broken
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//! connection the server needs to be run first, otherwise the client will block forever.
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extern crate futures;
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extern crate tokio;
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use std::env;
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use std::io::stdin;
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use std::net::SocketAddr;
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use tokio::net::UdpSocket;
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use tokio::prelude::*;
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fn get_stdin_data() -> Result<Vec<u8>, Box<dyn std::error::Error>> {
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let mut buf = Vec::new();
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stdin().read_to_end(&mut buf)?;
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Ok(buf)
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}
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fn main() -> Result<(), Box<dyn std::error::Error>> {
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let remote_addr: SocketAddr = env::args()
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.nth(1)
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.unwrap_or("127.0.0.1:8080".into())
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.parse()?;
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// We use port 0 to let the operating system allocate an available port for us.
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let local_addr: SocketAddr = if remote_addr.is_ipv4() {
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"0.0.0.0:0"
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} else {
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"[::]:0"
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}
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.parse()?;
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let socket = UdpSocket::bind(&local_addr)?;
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const MAX_DATAGRAM_SIZE: usize = 65_507;
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socket
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.send_dgram(get_stdin_data()?, &remote_addr)
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.and_then(|(socket, _)| socket.recv_dgram(vec![0u8; MAX_DATAGRAM_SIZE]))
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.map(|(_, data, len, _)| {
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println!(
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"Received {} bytes:\n{}",
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len,
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String::from_utf8_lossy(&data[..len])
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)
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})
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.wait()?;
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Ok(())
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}
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