extern crate serde_json; #[macro_use] extern crate failure; use clap; use clap::{crate_authors, crate_name, crate_version, Arg}; use futures::future::{done, ok, Either, Future}; use hyper::{Body, Request, Response}; use log::{info, trace}; use std::env; mod options; use options::Options; mod wireguard; use std::convert::TryFrom; use std::process::Command; use std::string::String; use wireguard::WireGuard; mod exporter_error; mod wireguard_config; use wireguard_config::peer_entry_hashmap_try_from; extern crate prometheus_exporter_base; use crate::exporter_error::ExporterError; use prometheus_exporter_base::render_prometheus; use std::sync::Arc; fn wg_with_text( wg_config_str: &str, wg_output: ::std::process::Output, ) -> Result, ExporterError> { let pehm = peer_entry_hashmap_try_from(wg_config_str)?; trace!("pehm == {:?}", pehm); let wg_output_string = String::from_utf8(wg_output.stdout)?; let wg = WireGuard::try_from(&wg_output_string as &str)?; Ok(Response::new(Body::from(wg.render_with_names(Some(&pehm))))) } fn perform_request( _req: Request, options: &Arc, ) -> impl Future, Error = failure::Error> { trace!("perform_request"); // this is needed to satisfy the borrow checker let options = options.clone(); done( Command::new("wg") .arg("show") .arg("all") .arg("dump") .output(), ) .from_err() .and_then(move |output| { if let Some(extract_names_config_file) = &options.extract_names_config_file { Either::A( done(::std::fs::read_to_string(extract_names_config_file)) .from_err() .and_then(|wg_config_string| wg_with_text(&wg_config_string as &str, output)), ) } else { Either::B( done(String::from_utf8(output.stdout)) .from_err() .and_then(|output_str| { trace!("{}", output_str); done(WireGuard::try_from(&output_str as &str)) .from_err() .and_then(|wg| { ok(Response::new(Body::from(wg.render_with_names(None)))) }) }), ) } }) .from_err() } fn main() { let matches = clap::App::new(crate_name!()) .version(crate_version!()) .author(crate_authors!("\n")) .arg( Arg::with_name("port") .short("p") .help("exporter port") .default_value("9586") .takes_value(true), ) .arg( Arg::with_name("verbose") .short("v") .help("verbose logging") .takes_value(false), ) .arg( Arg::with_name("extract_names_config_file") .short("n") .help("If set, the exporter will look in the specified WireGuard config file for peer names (must be in [Peer] definition and be a comment)") .takes_value(true)) .get_matches(); let options = Options::from_claps(&matches); if options.verbose { env::set_var( "RUST_LOG", format!("{}=trace,prometheus_exporter_base=trace", crate_name!()), ); } else { env::set_var( "RUST_LOG", format!("{}=info,prometheus_exporter_base=info", crate_name!()), ); } env_logger::init(); info!("using options: {:?}", options); let bind = matches.value_of("port").unwrap(); let bind = u16::from_str_radix(&bind, 10).expect("port must be a valid number"); let addr = ([0, 0, 0, 0], bind).into(); info!("starting exporter on {}", addr); render_prometheus(&addr, options, |request, options| { Box::new(perform_request(request, options)) }); }