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use std::cell::Cell;
use std::convert::Infallible;
use std::io;
use std::net::SocketAddr;
use std::sync::Arc;
use std::sync::Mutex;
use std::sync::atomic::{AtomicUsize, Ordering};
use std::convert::TryInto;
use actix_web::HttpResponse;
use actix_web::http::StatusCode;
use actix_web::App;
use actix_web::HttpRequest;
use actix_web::HttpServer;
use actix_web::Responder;
use actix_web::middleware;
use actix_web::web;
use actix_web::get;
use anyhow::Context;
use anyhow::Error;
use actix_web::Result;
use async_mpd::MpdClient;
use getset::Getters;
use prometheus_exporter_base::prelude::*;
use structopt::StructOpt;
use itertools::Itertools;
mod metric;
use metric::*;
#[derive(Debug, parse_display::Display, thiserror::Error)]
pub enum ApplicationError {
#[display("IO Error: {}")]
Io(#[from] std::io::Error),
#[display("MPD Error")]
MpdError(#[from] async_mpd::Error),
#[display("Error")]
AnyError(#[from] anyhow::Error),
}
#[derive(Getters, StructOpt)]
#[structopt(name = "prometheus-mpd-exporter", about = "Export MPD metrics to prometheus")]
struct Opt {
#[structopt(long)]
#[getset(get = "pub")]
mpd_server_addr: String,
#[structopt(long)]
#[getset(get = "pub")]
mpd_server_port: u16,
#[structopt(long)]
#[getset(get = "pub")]
bind_addr: String,
#[structopt(long)]
#[getset(get = "pub")]
bind_port: u16,
}
#[derive(Debug, Clone, Default)]
struct PrometheusOptions {}
async fn index(mpd_data: web::Data<Mutex<MpdClient>>, req: HttpRequest) -> impl Responder {
match index_handler(mpd_data).await {
Ok(text) => {
HttpResponse::build(StatusCode::OK)
.content_type("text/text; charset=utf-8")
.body(text)
}
Err(e) => {
HttpResponse::build(StatusCode::INTERNAL_SERVER_ERROR)
.content_type("text/text; charset=utf-8")
.body(format!("{}", e))
}
}
}
async fn index_handler(mpd_data: web::Data<Mutex<MpdClient>>) -> Result<String, ApplicationError> {
let mut mpd = mpd_data.lock().unwrap();
let stats = mpd.stats().await?;
let instance = String::new(); // TODO
let res = vec![
Metric::new("uptime" , stats.uptime , "The uptime of mpd", &instance).into_metric()?,
Metric::new("playtime" , stats.playtime , "The playtime of the current playlist", &instance).into_metric()?,
Metric::new("artists" , stats.artists , "The number of artists", &instance).into_metric()?,
Metric::new("albums" , stats.albums , "The number of albums", &instance).into_metric()?,
Metric::new("songs" , stats.songs , "The number of songs", &instance).into_metric()?,
Metric::new("db_playtime" , stats.db_playtime , "The database playtime", &instance).into_metric()?,
Metric::new("db_update" , stats.db_update , "The updates of the database", &instance).into_metric()?,
]
.into_iter()
.map(|m| {
m.render()
})
.join("\n");
log::debug!("res = {}", res);
Ok(res)
}
#[actix_web::main]
async fn main() -> Result<(), ApplicationError> {
let _ = env_logger::init();
log::info!("Starting...");
let opt = Opt::from_args();
let prometheus_bind_addr = format!("{}:{}", opt.bind_addr, opt.bind_port);
let mpd_connect_string = format!("{}:{}", opt.mpd_server_addr, opt.mpd_server_port);
log::debug!("Connecting to MPD = {}", mpd_connect_string);
let mpd = async_mpd::MpdClient::new(&*mpd_connect_string)
.await
.map(Mutex::new)?;
let mpd = web::Data::new(mpd);
HttpServer::new(move || {
App::new()
.app_data(mpd.clone()) // add shared state
.wrap(middleware::Logger::default())
.route("/", web::get().to(index))
})
.bind(prometheus_bind_addr)?
.run()
.await
.map_err(ApplicationError::from)
}
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