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         if self.active_players.len() == 0 {
  42             String::from("<none>")
  43         } else {
  44             self.active_players.join(", ")
  45         }
  46     }
  47
  48     pub fn format_last_backup(&self) -> String {
  49         match self.last_backup {
  50             Some(t) => {
  51                 let datetime: DateTime<Local> = t.into();
  52                 datetime.format("%d/%m/%Y %T").to_string()
  53             },
  54             None => String::from("?")
  55         }
  56     }
  57 }
  58
  59 const BINARY_PREFIXES: [&str; 8] = ["B", "KiB", "MiB", "GiB", "TiB", "PiB", "EiB", "ZiB"];
  60
  61 fn format_byte_size(bytes: u64, precision: usize) -> String {
  62     for i in 0 .. 8 {
  63         let mut size: u64 = 1;
  64         size *= 1024u64.pow(i as u32);
  65
  66         if bytes < 1024 {
  67             return format!("{} {}", std::cmp::max(0u64, bytes), BINARY_PREFIXES[i]);
  68         }
  69         else if bytes < 1024 * size {
  70             return format!("{:.prec$} {}", bytes as f64 / size as f64, BINARY_PREFIXES[i], prec = precision);
  71         }
  72     }
  73
  74     String::from("")
  75 }
  76
  77 const VALHEIM_PROCESS_NAME: &str = "valheim_server";
  78 const STRING_BEFORE_CHARACTER_NAME: &str = "Got character ZDOID from";
  79 const STRING_BEFORE_NB_OF_CONNECTIONS: &str = "Connections";
  80
  81 #[cfg(target_os = "linux")]
  82 fn get_active_players() -> Vec<String> {
  83     let mut journal =
  84         journal::OpenOptions::default().current_user(true).open().unwrap();
  85
  86     journal.seek_tail().unwrap();
  87
  88     let mut number_of_connections = -1i32;
  89     let mut players : Vec<String> = Vec::new();
  90
  91     loop {
  92         match journal.previous_entry() {
  93             Ok(Some(entry)) => {
  94                 if let (Some(unit), Some(mess)) = (entry.get("_SYSTEMD_UNIT"), entry.get("MESSAGE")) {
  95                     if unit == "valheim.service" {
  96                         if let Some(pos) = mess.find(STRING_BEFORE_CHARACTER_NAME) {
  97                             let character_str = mess.get(pos+STRING_BEFORE_CHARACTER_NAME.len()+1..).unwrap();
  98                             if let Some(pos_end) = character_str.find(" : ") {
  99                                 let player_name = String::from(character_str.get(0..pos_end).unwrap());
 100                                 if !players.contains(&player_name) {
 101                                     players.push(player_name);
 102                                     if players.len() as i32 == number_of_connections {
 103                                         return players;
 104                                     }
 105                                 }
 106                             }
 107                         }
 108                         else if let Some(pos) = mess.find(STRING_BEFORE_NB_OF_CONNECTIONS) {
 109                             let nb_of_connections_str = mess.get(pos+STRING_BEFORE_NB_OF_CONNECTIONS.len()+1..).unwrap();
 110                             if let Some(pos_end) = nb_of_connections_str.find(' ') {
 111                                 if let Ok(n) = nb_of_connections_str.get(0..pos_end).unwrap().parse() {
 112                                     if number_of_connections == -1 {
 113                                         number_of_connections = n as i32
 114
 115                                         if players.len() as i32 >= number_of_connections {
 116                                             return players;
 117                                         }
 118                                     }
 119                                 }
 120                             }
 121                         }
 122                     }
 123                 }
 124             },
 125             _ => return players
 126         }
 127     }
 128 }
 129
 130 #[cfg(target_os = "windows")]
 131 fn get_active_players() -> Vec<String> {
 132     Vec::new()
 133 }
 134
 135 fn get_last_backup_datetime(backup_path: &str) -> Option<SystemTime> {
 136     let mut times =
 137         fs::read_dir(backup_path).ok()?.filter_map(
 138             |e| {
 139                 let dir = e.ok()?;
 140                 if dir.path().is_file() { Some(dir.metadata().ok()?.modified().ok()?) } else { None }
 141             }
 142         )
 143         .collect::<Vec<SystemTime>>();
 144
 145     times.sort();
 146
 147     Some(times.last()?.clone())
 148 }
 149
 150 pub fn get_valheim_executable_information(world_path: &str, backup_path: &str) -> Option<ValheimExe> {
 151     let mut system = sysinfo::System::new_all();
 152     system.refresh_system();
 153     let processes = system.get_process_by_name(VALHEIM_PROCESS_NAME);
 154
 155     if processes.len() >= 1 {
 156         let process = processes.first().unwrap();
 157
 158         let world_size = match std::fs::metadata(world_path) { Ok(f) => f.len(), Err(_) => 0u64 };
 159
 160         Some(
 161             ValheimExe {
 162                 memory: process.memory(),
 163                 load_average_5min: system.get_load_average().five / system.get_processors().len() as f64 * 100.,
 164                 uptime: std::time::SystemTime::now().duration_since(std::time::UNIX_EPOCH).unwrap().as_secs() - process.start_time(),
 165                 world_size,
 166                 active_players: get_active_players(),
 167                 last_backup: get_last_backup_datetime(backup_path)
 168             }
 169         )
 170     } else {
 171         None
 172     }
 173 }