84 lines
2.0 KiB
Rust
84 lines
2.0 KiB
Rust
use axum::{
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routing::get,
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Router,
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response::{
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IntoResponse,
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Response,
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},
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http::StatusCode,
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};
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use std::net::SocketAddr;
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use std::str::FromStr;
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#[tokio::main]
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async fn main() {
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let mut listen = String::from("[::]:9152");
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let mut args = std::env::args();
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args.next();
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loop {
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let arg = if let Some(arg) = args.next() {
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arg
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} else {
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break
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};
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match arg.as_str() {
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"--help" | "-h" => {
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println!("Prometheus exporter for NixOS systems");
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println!("Use --listen <addr:port> bind the web service.");
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println!("Output will be on /metrics endpoint. HTTP 500 if something broke while scraping.");
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std::process::exit(0);
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},
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"--listen" => {
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listen = args.next().unwrap();
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},
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unknown => {
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println!("unknown option: {}", unknown);
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std::process::exit(1)
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}
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}
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}
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let app = Router::new().route("/metrics", get(metrics));
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let addr = SocketAddr::from_str(&listen).unwrap();
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println!("listening on http://{}", addr);
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axum::Server::bind(&addr)
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.serve(app.into_make_service())
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.await
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.unwrap();
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}
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fn get_current_system() -> Result<(String, String), String> {
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let symlink = match std::fs::read_link("/run/current-system") {
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Ok(symlink) => symlink,
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Err(err) => return Err(err.to_string())
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};
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let (hash, name) = symlink.file_name()
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.ok_or_else(String::default)?
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.to_str()
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.ok_or_else(String::default)?
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.split_once("-")
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.ok_or_else(String::default)?;
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Ok((String::from(hash), String::from(name)))
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}
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async fn metrics() -> Response {
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let current_system = get_current_system();
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let (hash, name) = match current_system {
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Ok((hash, name)) => (hash, name),
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Err(err) => {
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println!("failed: {}", err);
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return (StatusCode::INTERNAL_SERVER_ERROR, "").into_response()
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}
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};
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(
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StatusCode::OK,
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format!("nixos_nixos_current_system_hash{{hash=\"{}\"}}\nnixos_current_system_name{{name=\"{}\"}}", hash, name)
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).into_response()
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}
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