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"net", "process", "rt"] } diff --git a/proxy1 b/proxy1 new file mode 100755 index 0000000..7c730f8 --- /dev/null +++ b/proxy1 @@ -0,0 +1,2 @@ +#!/bin/sh +curl http://localhost:3001 || exit 1 diff --git a/src/main.rs b/src/main.rs new file mode 100644 index 0000000..12714ca --- /dev/null +++ b/src/main.rs @@ -0,0 +1,88 @@ +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::>(); + 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; + } + } + }); + } + } + } + } +}