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prometheus::GaugeVec, + gauge_track_album_info: prometheus::GaugeVec, + + player_finder: PlayerFinder, +} + +impl MediaPlayerExporter { + pub fn new() -> Result { + let gauge_playback_status = register_gauge_vec!( + "mpris_playback_status", + "Playback status of media player", + &["player", "bus_name"] + )?; + + let gauge_playback_position = register_gauge_vec!( + "mpris_playback_position", + "Playback position of current track", + &["bus_name"] + )?; + + let gauge_player_volume = register_gauge_vec!( + "mpris_player_volume", + "Volume of media player", + &["bus_name"] + )?; + + let gauge_track_length = register_gauge_vec!( + "mpris_track_length", + "Length of currently playing track", + &["bus_name", "title", "artist", "url"] + )?; + + let gauge_track_album_info = register_gauge_vec!( + "mpris_track_album_info", + "Album metadata of currently playing track", + &["bus_name", "name", "artist"] + )?; + + let player_finder = PlayerFinder::new().context("Could not connect to D-Bus")?; + + Ok(MediaPlayerExporter { + gauge_playback_status, + gauge_playback_position, + gauge_player_volume, + gauge_track_length, + gauge_track_album_info, + player_finder, + }) + } + + pub fn collect_metrics(&self) -> Result<()> { + let players = self.player_finder.find_all()?; + + self.gauge_playback_status.reset(); + self.gauge_playback_position.reset(); + self.gauge_player_volume.reset(); + self.gauge_track_length.reset(); + self.gauge_track_album_info.reset(); + + for player in players { + self.gauge_playback_status.with_label_values(&[ + player.identity(), + player.bus_name(), + ]).set(player.get_playback_status()? as u8 as f64); + + self.gauge_playback_position.with_label_values(&[ + player.bus_name(), + ]).set(player.get_position_in_microseconds()? as f64); + + match player.get_volume() { + Ok(volume) => { + self.gauge_player_volume.with_label_values(&[ + player.bus_name(), + ]).set(volume); + }, + Err(e) => println!("Error collecting volume from {}: {}", player.bus_name(), e), + } + + let metadata = player.get_metadata()?; + + let artists; + match metadata.artists() { + Some(v) => artists = v.join(", "), + None => artists = "Unknown".to_string(), + } + self.gauge_track_length.with_label_values(&[ + player.bus_name(), + metadata.title().unwrap_or("Unknown"), + artists.as_str(), + metadata.url().unwrap_or(""), + ]).set(metadata.length_in_microseconds().unwrap_or(0) as f64); + + + let album_artists; + match metadata.album_artists() { + Some(v) => album_artists = v.join(", "), + None => album_artists = "Unknown".to_string(), + } + self.gauge_track_album_info.with_label_values(&[ + player.bus_name(), + metadata.album_name().unwrap_or("Unknown"), + album_artists.as_str(), + ]).set(1f64); + } + + Ok(()) + } +} \ No newline at end of file diff --git a/src/main.rs b/src/main.rs new file mode 100644 index 0000000..1c350f5 --- /dev/null +++ b/src/main.rs @@ -0,0 +1,45 @@ +use anyhow::{Context, Result}; +use clap::Parser; + +mod exporter; +use crate::exporter::MediaPlayerExporter; + +#[derive(Parser, Debug)] +#[command(version, about, long_about = None)] +struct Args { + #[arg(short, long)] + bind_addr: String, +} + +fn main() { + let args = Args::parse(); + + let binding = handle_errors(args.bind_addr.parse().context("Failed to parse bind address")); + let exporter = handle_errors(prometheus_exporter::start(binding).context("Failed to start exporter http server")); + + println!("Started http server on {}", binding); + + let mpe = handle_errors(MediaPlayerExporter::new()); + + loop { + let guard = exporter.wait_request(); + + handle_errors(mpe.collect_metrics().context("Failed to collect metrics")); + + drop(guard); + } +} + +fn handle_errors(r: Result) -> T { + match r { + Ok(v) => return v, + Err(error) => { + println!("Error: {}", error); + for (i, cause) in error.chain().skip(1).enumerate() { + print!("{}", " ".repeat(i + 1)); + println!("Caused by: {}", cause); + } + std::process::exit(1); + } + } +}