backend/src/valheim_controller.rs

   1
   2 use std::{ fs, time::SystemTime };
   3 use sysinfo::{ ProcessExt, SystemExt };
   4 use chrono::{ DateTime, offset::Local };
   5
   6 #[cfg(target_os = "linux")]
   7 use systemd::journal;
   8
   9 #[derive(Clone, Debug)]
  10 pub struct ValheimExe {
  11     memory: u64, // [kB].
  12     load_average_5min: f64, // [%].
  13     uptime: u64, // [s].
  14     world_size: u64, // [B].
  15     active_players: Vec<String>,
  16     last_backup: Option<SystemTime>,
  17 }
  18
  19 impl ValheimExe {
  20     pub fn format_memory(&self) -> String {
  21         format_byte_size(self.memory * 1024, 2)
  22     }
  23
  24     pub fn format_load_average(&self) -> String {
  25         format!("{:.2} %", self.load_average_5min)
  26     }
  27
  28     pub fn format_uptime(&self) -> String {
  29         let mins = self.uptime / 60;
  30         let hours = mins / 60;
  31         let days = hours / 24;
  32         format!("{}d {}h {}min", days, hours - 24 * days, mins - 60 * hours)
  33     }
  34
  35     pub fn format_world_size(&self) -> String {
  36         format_byte_size(self.world_size, 2)
  37     }
  38
  39     pub fn format_active_players(&self) -> String {
  40         if self.active_players.len() == 0 {
  41             String::from("<none>")
  42         } else {
  43             self.active_players.join(", ")
  44         }
  45     }
  46
  47     pub fn format_last_backup(&self) -> String {
  48         match self.last_backup {
  49             Some(t) => {
  50                 let datetime: DateTime<Local> = t.into();
  51                 datetime.format("%d/%m/%Y %T").to_string()
  52             },
  53             None => String::from("?")
  54         }
  55     }
  56 }
  57
  58 const BINARY_PREFIXES: [&str; 8] = ["B", "KiB", "MiB", "GiB", "TiB", "PiB", "EiB", "ZiB"];
  59
  60 fn format_byte_size(bytes: u64, precision: usize) -> String {
  61     for i in 0 .. 8 {
  62         let mut size: u64 = 1;
  63         size *= 1024u64.pow(i as u32);
  64
  65         if bytes < 1024 {
  66             return format!("{} {}", std::cmp::max(0u64, bytes), BINARY_PREFIXES[i]);
  67         }
  68         else if bytes < 1024 * size {
  69             return format!("{:.prec$} {}", bytes as f64 / size as f64, BINARY_PREFIXES[i], prec = precision);
  70         }
  71     }
  72
  73     String::from("")
  74 }
  75
  76 const VALHEIM_PROCESS_NAME: &str = "valheim_server";
  77
  78 #[cfg(target_os = "linux")]
  79 const STRING_BEFORE_CHARACTER_NAME: &str = "Got character ZDOID from";
  80
  81 #[cfg(target_os = "linux")]
  82 const STRING_BEFORE_NB_OF_CONNECTIONS: &str = "Connections";
  83
  84 #[cfg(target_os = "linux")]
  85 fn get_active_players() -> Vec<String> {
  86     let mut journal =
  87         journal::OpenOptions::default().current_user(true).open().unwrap();
  88
  89     journal.seek_tail().unwrap();
  90
  91     let mut number_of_connections = -1i32;
  92     let mut players : Vec<String> = Vec::new();
  93
  94     loop {
  95         match journal.previous_entry() {
  96             Ok(Some(entry)) => {
  97                 if let (Some(unit), Some(mess)) = (entry.get("_SYSTEMD_UNIT"), entry.get("MESSAGE")) {
  98                     if unit == "valheim.service" {
  99                         if let Some(pos) = mess.find(STRING_BEFORE_CHARACTER_NAME) {
 100                             let character_str = mess.get(pos+STRING_BEFORE_CHARACTER_NAME.len()+1..).unwrap();
 101                             if let Some(pos_end) = character_str.find(" : ") {
 102                                 let player_name = String::from(character_str.get(0..pos_end).unwrap());
 103                                 if !players.contains(&player_name) {
 104                                     players.push(player_name);
 105                                     if players.len() as i32 == number_of_connections {
 106                                         return players;
 107                                     }
 108                                 }
 109                             }
 110                         }
 111                         else if let Some(pos) = mess.find(STRING_BEFORE_NB_OF_CONNECTIONS) {
 112                             let nb_of_connections_str = mess.get(pos+STRING_BEFORE_NB_OF_CONNECTIONS.len()+1..).unwrap();
 113                             if let Some(pos_end) = nb_of_connections_str.find(' ') {
 114                                 if let Ok(n) = nb_of_connections_str.get(0..pos_end).unwrap().parse::<i32>() {
 115                                     if number_of_connections == -1 {
 116                                         number_of_connections = n;
 117
 118                                         if players.len() as i32 >= number_of_connections {
 119                                             return players;
 120                                         }
 121                                     }
 122                                 }
 123                             }
 124                         }
 125                     }
 126                 }
 127             },
 128             _ => return players
 129         }
 130     }
 131 }
 132
 133 #[cfg(target_os = "windows")]
 134 fn get_active_players() -> Vec<String> {
 135     Vec::new()
 136 }
 137
 138 fn get_last_backup_datetime(backup_path: &str) -> Option<SystemTime> {
 139     let mut times =
 140         fs::read_dir(backup_path).ok()?.filter_map(
 141             |e| {
 142                 let dir = e.ok()?;
 143                 if dir.path().is_file() { Some(dir.metadata().ok()?.modified().ok()?) } else { None }
 144             }
 145         )
 146         .collect::<Vec<SystemTime>>();
 147
 148     times.sort();
 149
 150     Some(times.last()?.clone())
 151 }
 152
 153 pub fn get_valheim_executable_information(world_path: &str, backup_path: &str) -> Option<ValheimExe> {
 154     let mut system = sysinfo::System::new_all();
 155     system.refresh_system();
 156     let mut processes = system.processes_by_name(VALHEIM_PROCESS_NAME);
 157
 158     if let Some(process) = processes.next() {
 159
 160         let world_size = match std::fs::metadata(world_path) { Ok(f) => f.len(), Err(_) => 0u64 };
 161
 162         Some(
 163             ValheimExe {
 164                 memory: process.memory(),
 165                 load_average_5min: system.load_average().five / system.processors().len() as f64 * 100.,
 166                 uptime: std::time::SystemTime::now().duration_since(std::time::UNIX_EPOCH).unwrap().as_secs() - process.start_time(),
 167                 world_size,
 168                 active_players: get_active_players(),
 169                 last_backup: get_last_backup_datetime(backup_path)
 170             }
 171         )
 172     } else {
 173         None
 174     }
 175 }