backend/src/valheim_controller.rs

   1 use sysinfo::{ ProcessExt, SystemExt };
   2 use systemd::journal;
   3
   4 #[derive(Debug)]
   5 pub struct ValheimExe {
   6     memory: u64, // [kB].
   7     load_average_5min: f64, // [%].
   8     uptime: u64, // [s].
   9     world_size: u64, // [B].
  10     nb_of_players: u32,
  11 }
  12
  13 impl ValheimExe {
  14     pub fn format_memory(&self) -> String {
  15         format_byte_size(self.memory * 1024, 2)
  16     }
  17
  18     pub fn format_load_average(&self) -> String {
  19         format!("{:.2} %", self.load_average_5min)
  20     }
  21
  22     pub fn format_uptime(&self) -> String {
  23         let mins = self.uptime / 60;
  24         let hours = mins / 60;
  25         let days = hours / 24;
  26         format!("{}d{}h{}min", days, hours - 24 * days, mins - 60 * hours)
  27     }
  28
  29     pub fn format_world_size(&self) -> String {
  30         format_byte_size(self.world_size, 2)
  31     }
  32
  33     pub fn get_nb_of_player(&self) -> u32 {
  34         self.nb_of_players
  35     }
  36 }
  37
  38 const BINARY_PREFIXES: [&str; 8] = ["B", "KiB", "MiB", "GiB", "TiB", "PiB", "EiB", "ZiB"];
  39
  40 fn format_byte_size(bytes: u64, precision: usize) -> String {
  41     for i in 0 .. 8 {
  42         let mut size: u64 = 1;
  43         size *= 1024u64.pow(i as u32);
  44
  45         if bytes < 1024 {
  46             return format!("{} {}", std::cmp::max(0u64, bytes), BINARY_PREFIXES[i]);
  47         }
  48         else if bytes < 1024 * size {
  49             return format!("{:.prec$} {}", bytes as f64 / size as f64, BINARY_PREFIXES[i], prec = precision);
  50         }
  51     }
  52
  53     String::from("")
  54 }
  55
  56 const VALHEIM_PROCESS_NAME: &str = "valheim_server";
  57
  58 fn get_number_of_players() -> u32 {
  59     let mut journal =
  60         journal::OpenOptions::default().current_user(true).open().unwrap();
  61
  62     journal.seek_tail().unwrap();
  63
  64     loop {
  65         match journal.previous_entry() {
  66             Ok(Some(entry)) => {
  67                 if let (Some(unit), Some(mess)) = (entry.get("_SYSTEMD_UNIT"), entry.get("MESSAGE")) {
  68                     if unit == "valheim.service" {
  69                         if let Some(pos) = mess.find("Connections") {
  70                             let nb_of_connections_str = mess.get(pos+12..).unwrap();
  71                             if let Some(pos_end) = nb_of_connections_str.find(' ') {
  72                                 if let Ok(n) = nb_of_connections_str.get(0..pos_end).unwrap().parse() {
  73                                     return n;
  74                                 }
  75                             }
  76                         }
  77                     }
  78                 }
  79             },
  80             _ => return 0
  81         }
  82     }
  83 }
  84
  85 pub fn get_valheim_executable_information(world_path : &str) -> Option<ValheimExe> {
  86     let mut system = sysinfo::System::new_all();
  87     system.refresh_system();
  88     let processes = system.get_process_by_name(VALHEIM_PROCESS_NAME);
  89
  90     if processes.len() >= 1 {
  91         let process = processes.first().unwrap();
  92
  93         let world_size = match std::fs::metadata(world_path) { Ok(f) => f.len(), Err(_) => 0u64 };
  94
  95         Some(
  96             ValheimExe {
  97                 memory: process.memory(),
  98                 load_average_5min: system.get_load_average().five / system.get_processors().len() as f64 * 100.,
  99                 uptime: std::time::SystemTime::now().duration_since(std::time::UNIX_EPOCH).unwrap().as_secs() - process.start_time(),
 100                 world_size,
 101                 nb_of_players: get_number_of_players()
 102             }
 103         )
 104     } else {
 105         None
 106     }
 107 }