UDP server hexdump to console example

Just a small UDP server which listen in its own thread and sends the
messages it receives via a flume unbounded channel to the main thread
which prints the received message as a hexdump to the console.
This commit is contained in:
ddidderr 2022-02-11 14:43:53 +01:00
commit 59a009594f
Signed by: ddidderr
GPG Key ID: 3841F1C27E6F0E14
5 changed files with 454 additions and 0 deletions

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[package]
name = "udp-hexdump-example"
version = "0.1.0"
edition = "2021"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
flume = "0.10"
hexyl = "0.9"
[profile.release]
lto = true
codegen-units = 1
debug = false
panic = "unwind"

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# UDP server hexdump to console example
Just a small UDP server which listen in its own thread and sends the
messages it receives via a flume unbounded channel to the main thread
which prints the received message as a hexdump to the console.

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use flume::{Receiver, Sender};
use std::io::Write;
use std::net::UdpSocket;
use std::thread::{self, JoinHandle};
use std::time::{Duration, Instant};
fn listen() -> (JoinHandle<()>, Sender<Vec<u8>>, Receiver<Vec<u8>>) {
let (tx, rx) = flume::unbounded();
let tx_clone = tx.clone();
let rx_clone = rx.clone();
(
thread::spawn(move || {
let socket = UdpSocket::bind("127.0.0.1:13337").unwrap();
dbg!(&socket);
loop {
let mut buf = [0; 256];
//println!("[udp_socket] waiting for msg");
let (len, src) = socket.recv_from(&mut buf).unwrap();
let buf = &mut buf[..len];
tx.send(Vec::from(buf)).unwrap();
}
}),
tx_clone,
rx_clone,
)
}
fn print_hex(bytes: &[u8]) {
let stdout = std::io::stdout();
let mut stdout = stdout.lock();
let mut hxp = hexyl::Printer::new(&mut stdout, true, hexyl::BorderStyle::None, false);
let _ = hxp.print_all(bytes);
}
fn main() {
let (thread_udp, thread_udp_tx, thread_udp_rx) = listen();
for msg in thread_udp_rx.iter() {
print_hex(&msg);
}
let _ = thread_udp.join();
}