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Mark 2025-05-19 13:03:11 +02:00
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/target

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Cargo.toml Normal file
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[package]
name = "proxy_with_fallback"
version = "0.1.0"
edition = "2024"
[dependencies]
tokio = { version = "1.45.0", features = ["io-std", "io-util", "macros", "net", "process", "rt"] }

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proxy1 Executable file
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#!/bin/sh
curl http://localhost:3001 || exit 1

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src/main.rs Normal file
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use std::time::{Duration, Instant};
use tokio::{
io::{AsyncReadExt, AsyncWriteExt},
net::{TcpListener, TcpStream},
process::Command,
};
#[tokio::main(flavor = "current_thread")]
async fn main() {
eprintln!(
"USAGE:
- Set env var ADDR=addr:port
- Set env var INTERVAL=seconds
- Set env vars ADDR1-ADDRn for n proxies
- Create scripts ./proxy1 - ./proxy(n-1) to check if proxy target is online (exit status 0)
- If all scripts fail, proxy n is used"
);
let interval: u64 = std::env::var("INTERVAL")
.expect("expected env var INTERVAL to be set")
.trim()
.parse()
.expect(
"expected env var INTERVAL to be set to an integer value greater than or equal to zero",
);
let proxies = (1..)
.map_while(|i| std::env::var(format!("ADDR{i}")).ok())
.collect::<Vec<_>>();
if proxies.is_empty() {
panic!("expected env vars ADDR1-ADDRn");
}
let listener =
TcpListener::bind(std::env::var("ADDR").expect("expected env var ADDR to be set"))
.await
.unwrap();
let mut next_check = Instant::now();
let mut selected_proxy = 0;
loop {
let (con, _) = listener.accept().await.unwrap();
let now = Instant::now();
if now >= next_check {
next_check = now + Duration::from_secs(interval);
let pproxy = selected_proxy;
selected_proxy = proxies.len();
for i in 1..proxies.len() {
if Command::new(format!("./proxy{i}"))
.status()
.await
.is_ok_and(|status| status.success())
{
selected_proxy = i;
}
}
if selected_proxy != pproxy {
eprintln!(
"Using proxy {selected_proxy}: {}",
proxies[selected_proxy - 1]
);
}
}
if selected_proxy > 0 {
if let Some(proxy) = proxies.get(selected_proxy - 1).cloned() {
if let Ok(prox) = TcpStream::connect(&proxy).await {
let (mut con_read, mut con_write) = con.into_split();
let (mut prox_read, mut prox_write) = prox.into_split();
tokio::task::spawn(async move {
let mut buf = [0u8; 256];
while let Ok(n) = con_read.read(&mut buf).await {
if prox_write.write_all(&buf[0..n]).await.is_err() {
break;
}
}
});
tokio::task::spawn(async move {
let mut buf = [0u8; 256];
while let Ok(n) = prox_read.read(&mut buf).await {
if con_write.write_all(&buf[0..n]).await.is_err() {
break;
}
}
});
}
}
}
}
}