backend/src/valheim_controller.rs

   1 use sysinfo::{ ProcessExt, SystemExt };
   2
   3 use std::{ fs, time::SystemTime };
   4
   5 use chrono::{ DateTime, offset::Local };
   6
   7 #[cfg(target_os = "linux")]
   8 use systemd::journal;
   9
  10 #[derive(Clone, Debug)]
  11 pub struct ValheimExe {
  12     memory: u64, // [kB].
  13     load_average_5min: f64, // [%].
  14     uptime: u64, // [s].
  15     world_size: u64, // [B].
  16     active_players: Vec<String>,
  17     last_backup: Option<SystemTime>,
  18 }
  19
  20 impl ValheimExe {
  21     pub fn format_memory(&self) -> String {
  22         format_byte_size(self.memory * 1024, 2)
  23     }
  24
  25     pub fn format_load_average(&self) -> String {
  26         format!("{:.2} %", self.load_average_5min)
  27     }
  28
  29     pub fn format_uptime(&self) -> String {
  30         let mins = self.uptime / 60;
  31         let hours = mins / 60;
  32         let days = hours / 24;
  33         format!("{}d {}h {}min", days, hours - 24 * days, mins - 60 * hours)
  34     }
  35
  36     pub fn format_world_size(&self) -> String {
  37         format_byte_size(self.world_size, 2)
  38     }
  39
  40     pub fn format_active_players(&self) -> String {
  41         self.active_players.join(", ")
  42     }
  43
  44     pub fn format_last_backup(&self) -> String {
  45         match self.last_backup {
  46             Some(t) => {
  47                 let datetime: DateTime<Local> = t.into();
  48                 datetime.format("%d/%m/%Y %T").to_string()
  49             },
  50             None => String::from("?")
  51         }
  52     }
  53 }
  54
  55 const BINARY_PREFIXES: [&str; 8] = ["B", "KiB", "MiB", "GiB", "TiB", "PiB", "EiB", "ZiB"];
  56
  57 fn format_byte_size(bytes: u64, precision: usize) -> String {
  58     for i in 0 .. 8 {
  59         let mut size: u64 = 1;
  60         size *= 1024u64.pow(i as u32);
  61
  62         if bytes < 1024 {
  63             return format!("{} {}", std::cmp::max(0u64, bytes), BINARY_PREFIXES[i]);
  64         }
  65         else if bytes < 1024 * size {
  66             return format!("{:.prec$} {}", bytes as f64 / size as f64, BINARY_PREFIXES[i], prec = precision);
  67         }
  68     }
  69
  70     String::from("")
  71 }
  72
  73 const VALHEIM_PROCESS_NAME: &str = "valheim_server";
  74
  75 #[cfg(target_os = "linux")]
  76 fn get_active_players() -> Vec<String> {
  77     let mut journal =
  78         journal::OpenOptions::default().current_user(true).open().unwrap();
  79
  80     journal.seek_tail().unwrap();
  81
  82     let mut number_of_connections = -1;
  83     let mut players : Vec<String> = Vec::new();
  84
  85     loop {
  86         match journal.previous_entry() {
  87             Ok(Some(entry)) => {
  88                 if let (Some(unit), Some(mess)) = (entry.get("_SYSTEMD_UNIT"), entry.get("MESSAGE")) {
  89                     if unit == "valheim.service" {
  90                         //"Got character ZDOID from {}"
  91                         if let Some(pos) = mess.find("Got character ZDOID from") {
  92                             let character_str = mess.get(pos+25..).unwrap();
  93                             if let Some(pos_end) = character_str.find(" : ") {
  94                                 let player_name = String::from(character_str.get(0..pos_end));
  95                                 if !players.contains(player_name) {
  96                                     players.push(player_name);
  97                                     if players.len() == number_of_connections {
  98                                         return players;
  99                                     }
 100                                 }
 101                             }
 102                         }
 103                         else if let Some(pos) = mess.find("Connections") {
 104                             let nb_of_connections_str = mess.get(pos+12..).unwrap();
 105                             if let Some(pos_end) = nb_of_connections_str.find(' ') {
 106                                 if let Ok(n) = nb_of_connections_str.get(0..pos_end).unwrap().parse() {
 107                                     number_of_connections = n;
 108                                     if players.len() >= number_of_connections {
 109                                         return players;
 110                                     }
 111                                 }
 112                             }
 113                         }
 114                     }
 115                 }
 116             },
 117             _ => return players
 118         }
 119     }
 120 }
 121
 122 #[cfg(target_os = "windows")]
 123 fn get_active_players() -> Vec<String> {
 124     Vec::new()
 125 }
 126
 127 fn get_last_backup_datetime(backup_path: &str) -> Option<SystemTime> {
 128     let mut times =
 129         fs::read_dir(backup_path).ok()?.filter_map(
 130             |e| {
 131                 let dir = e.ok()?;
 132                 if dir.path().is_file() { Some(dir.metadata().ok()?.modified().ok()?) } else { None }
 133             }
 134         )
 135         .collect::<Vec<SystemTime>>();
 136
 137     times.sort();
 138
 139     Some(times.last()?.clone())
 140 }
 141
 142 pub fn get_valheim_executable_information(world_path: &str, backup_path: &str) -> Option<ValheimExe> {
 143     let mut system = sysinfo::System::new_all();
 144     system.refresh_system();
 145     let processes = system.get_process_by_name(VALHEIM_PROCESS_NAME);
 146
 147     if processes.len() >= 1 {
 148         let process = processes.first().unwrap();
 149
 150         let world_size = match std::fs::metadata(world_path) { Ok(f) => f.len(), Err(_) => 0u64 };
 151
 152         Some(
 153             ValheimExe {
 154                 memory: process.memory(),
 155                 load_average_5min: system.get_load_average().five / system.get_processors().len() as f64 * 100.,
 156                 uptime: std::time::SystemTime::now().duration_since(std::time::UNIX_EPOCH).unwrap().as_secs() - process.start_time(),
 157                 world_size,
 158                 active_players: get_active_players(),
 159                 last_backup: get_last_backup_datetime(backup_path)
 160             }
 161         )
 162     } else {
 163         None
 164     }
 165 }