backend/src/minecraft_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 MinecraftExe {
  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 MinecraftExe {
  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         /* Commented because the player list isn't correct (the number is).
  42         if self.active_players.len() == 0 {
  43             String::from("<none>")
  44         } else {
  45             self.active_players.join(", ")
  46         }*/
  47         self.active_players.len().to_string()
  48     }
  49
  50     pub fn format_last_backup(&self) -> String {
  51         match self.last_backup {
  52             Some(t) => {
  53                 let datetime: DateTime<Local> = t.into();
  54                 datetime.format("%d/%m/%Y %T").to_string()
  55             },
  56             None => String::from("?")
  57         }
  58     }
  59 }
  60
  61 const BINARY_PREFIXES: [&str; 8] = ["B", "KiB", "MiB", "GiB", "TiB", "PiB", "EiB", "ZiB"];
  62
  63 fn format_byte_size(bytes: u64, precision: usize) -> String {
  64     for i in 0 .. 8 {
  65         let mut size: u64 = 1;
  66         size *= 1024u64.pow(i as u32);
  67
  68         if bytes < 1024 {
  69             return format!("{} {}", std::cmp::max(0u64, bytes), BINARY_PREFIXES[i]);
  70         }
  71         else if bytes < 1024 * size {
  72             return format!("{:.prec$} {}", bytes as f64 / size as f64, BINARY_PREFIXES[i], prec = precision);
  73         }
  74     }
  75
  76     String::from("")
  77 }
  78
  79 const MINECRAFT_PROCESS_NAME: &str = "minecraft_server";
  80
  81 #[cfg(target_os = "linux")]
  82 const STRING_BEFORE_CHARACTER_NAME: &str = "Got character ZDOID from";
  83
  84 #[cfg(target_os = "linux")]
  85 const STRING_BEFORE_NB_OF_CONNECTIONS: &str = "Connections";
  86
  87 // It doesn't work for the moment, it only scan the connection event and do not treat disconnections.
  88 #[cfg(target_os = "linux")]
  89 fn get_active_players() -> Vec<String> {
  90     let mut journal =
  91         journal::OpenOptions::default().current_user(true).open().unwrap();
  92
  93     journal.seek_tail().unwrap();
  94
  95     let mut number_of_connections = -1i32;
  96     let mut players : Vec<String> = Vec::new();
  97
  98     loop {
  99         match journal.previous_entry() {
 100             Ok(Some(entry)) => {
 101                 if let (Some(unit), Some(mess)) = (entry.get("_SYSTEMD_UNIT"), entry.get("MESSAGE")) {
 102                     if unit == "minecraft.service" {
 103                         if let Some(pos) = mess.find(STRING_BEFORE_CHARACTER_NAME) {
 104                             let character_str = mess.get(pos+STRING_BEFORE_CHARACTER_NAME.len()+1..).unwrap();
 105                             if let Some(pos_end) = character_str.find(" : ") {
 106                                 let player_name = String::from(character_str.get(0..pos_end).unwrap());
 107                                 if !players.contains(&player_name) {
 108                                     players.push(player_name);
 109                                     if players.len() as i32 == number_of_connections {
 110                                         return players;
 111                                     }
 112                                 }
 113                             }
 114                         }
 115                         else if let Some(pos) = mess.find(STRING_BEFORE_NB_OF_CONNECTIONS) {
 116                             let nb_of_connections_str = mess.get(pos+STRING_BEFORE_NB_OF_CONNECTIONS.len()+1..).unwrap();
 117                             if let Some(pos_end) = nb_of_connections_str.find(' ') {
 118                                 if let Ok(n) = nb_of_connections_str.get(0..pos_end).unwrap().parse::<i32>() {
 119                                     if number_of_connections == -1 {
 120                                         number_of_connections = n;
 121
 122                                         if players.len() as i32 >= number_of_connections {
 123                                             return players;
 124                                         }
 125                                     }
 126                                 }
 127                             }
 128                         }
 129                     }
 130                 }
 131             },
 132             _ => return players
 133         }
 134     }
 135 }
 136
 137 #[cfg(target_os = "windows")]
 138 fn get_active_players() -> Vec<String> {
 139     Vec::new()
 140 }
 141
 142 fn get_last_backup_datetime(backup_path: &str) -> Option<SystemTime> {
 143     let mut times =
 144         fs::read_dir(backup_path).ok()?.filter_map(
 145             |e| {
 146                 let dir = e.ok()?;
 147                 if dir.path().is_file() { Some(dir.metadata().ok()?.modified().ok()?) } else { None }
 148             }
 149         )
 150         .collect::<Vec<SystemTime>>();
 151
 152     times.sort();
 153
 154     Some(times.last()?.clone())
 155 }
 156
 157 pub fn get_minecraft_executable_information(world_path: &str, backup_path: &str) -> Option<MinecraftExe> {
 158     let mut system = sysinfo::System::new_all();
 159     system.refresh_system();
 160     let processes = system.get_process_by_name(MINECRAFT_PROCESS_NAME);
 161
 162     if processes.len() >= 1 {
 163         let process = processes.first().unwrap();
 164
 165         let world_size = match std::fs::metadata(world_path) { Ok(f) => f.len(), Err(_) => 0u64 };
 166
 167         Some(
 168             MinecraftExe {
 169                 memory: process.memory(),
 170                 load_average_5min: system.get_load_average().five / system.get_processors().len() as f64 * 100.,
 171                 uptime: std::time::SystemTime::now().duration_since(std::time::UNIX_EPOCH).unwrap().as_secs() - process.start_time(),
 172                 world_size,
 173                 active_players: get_active_players(),
 174                 last_backup: get_last_backup_datetime(backup_path)
 175             }
 176         )
 177     } else {
 178         None
 179     }
 180 }