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 #[derive(Clone, Debug)]
   8 pub struct MinecraftExe {
   9     memory: u64, // [kB].
  10     load_average_5min: f64, // [%].
  11     uptime: u64, // [s].
  12     world_size: u64, // [B].
  13     active_players: Vec<String>,
  14     last_backup: Option<SystemTime>,
  15 }
  16
  17 impl MinecraftExe {
  18     pub fn format_memory(&self) -> String {
  19         format_byte_size(self.memory * 1024, 2)
  20     }
  21
  22     pub fn format_load_average(&self) -> String {
  23         format!("{:.2} %", self.load_average_5min)
  24     }
  25
  26     pub fn format_uptime(&self) -> String {
  27         let mins = self.uptime / 60;
  28         let hours = mins / 60;
  29         let days = hours / 24;
  30         format!("{}d {}h {}min", days, hours - 24 * days, mins - 60 * hours)
  31     }
  32
  33     pub fn format_world_size(&self) -> String {
  34         format_byte_size(self.world_size, 2)
  35     }
  36
  37     pub fn format_active_players(&self) -> String {
  38         if self.active_players.len() == 0 {
  39             String::from("<none>")
  40         } else {
  41             self.active_players.join(", ")
  42         }
  43     }
  44
  45     pub fn format_last_backup(&self) -> String {
  46         match self.last_backup {
  47             Some(t) => {
  48                 let datetime: DateTime<Local> = t.into();
  49                 datetime.format("%d/%m/%Y %T").to_string()
  50             },
  51             None => String::from("?")
  52         }
  53     }
  54 }
  55
  56 const BINARY_PREFIXES: [&str; 8] = ["B", "KiB", "MiB", "GiB", "TiB", "PiB", "EiB", "ZiB"];
  57
  58 fn format_byte_size(bytes: u64, precision: usize) -> String {
  59     for i in 0 .. 8 {
  60         let mut size: u64 = 1;
  61         size *= 1024u64.pow(i as u32);
  62
  63         if bytes < 1024 {
  64             return format!("{} {}", std::cmp::max(0u64, bytes), BINARY_PREFIXES[i]);
  65         }
  66         else if bytes < 1024 * size {
  67             return format!("{:.prec$} {}", bytes as f64 / size as f64, BINARY_PREFIXES[i], prec = precision);
  68         }
  69     }
  70
  71     String::from("")
  72 }
  73
  74 const MINECRAFT_PROCESS_NAME: &str = "java";
  75
  76 // It doesn't work for the moment, it only scan the connection event and do not treat disconnections.
  77 fn get_active_players(rcon_password: &str) -> Vec<String> {
  78     let mut client = minecraft_client_rs::Client::new("127.0.0.1:25575".to_string()).unwrap();
  79
  80     let players =
  81         match client.authenticate(rcon_password.to_string()) {
  82             Ok(_) => {
  83                 match client.send_command("list".to_string()) {
  84                     Ok(resp) => {
  85                         resp.body
  86                             .split('\n')
  87                             .skip(1)
  88                             .filter(|n| !n.is_empty())
  89                             .map(|n| n.to_string())
  90                             .collect()
  91                     },
  92                     Err(_e) => {
  93                         println!("Error from 'list' command");
  94                         Vec::new()
  95                     },
  96                 }
  97             },
  98             Err(_e) => {
  99                 println!("Authentication error");
 100                 Vec::new()
 101             },
 102         };
 103
 104     client.close().unwrap();
 105
 106     players
 107 }
 108
 109 fn get_last_backup_datetime(backup_path: &str) -> Option<SystemTime> {
 110     let mut times =
 111         fs::read_dir(backup_path).ok()?.filter_map(
 112             |e| {
 113                 let dir = e.ok()?;
 114                 if dir.path().is_file() { Some(dir.metadata().ok()?.modified().ok()?) } else { None }
 115             }
 116         )
 117         .collect::<Vec<SystemTime>>();
 118
 119     times.sort();
 120
 121     Some(times.last()?.clone())
 122 }
 123
 124 pub fn get_minecraft_executable_information(world_path: &str, backup_path: &str, rcon_password: &str) -> Option<MinecraftExe> {
 125     let mut system = sysinfo::System::new_all();
 126     system.refresh_system();
 127     let processes = system.get_process_by_name(MINECRAFT_PROCESS_NAME);
 128
 129     // TODO: find the correct process by checking the correct jar name in parameters.
 130     if processes.len() >= 1 {
 131         let process = processes.first().unwrap();
 132
 133         let world_size = match std::fs::metadata(world_path) { Ok(f) => f.len(), Err(_) => 0u64 };
 134
 135         Some(
 136             MinecraftExe {
 137                 memory: process.memory(),
 138                 load_average_5min: system.get_load_average().five / system.get_processors().len() as f64 * 100.,
 139                 uptime: std::time::SystemTime::now().duration_since(std::time::UNIX_EPOCH).unwrap().as_secs() - process.start_time(),
 140                 world_size,
 141                 active_players: get_active_players(rcon_password),
 142                 last_backup: get_last_backup_datetime(backup_path)
 143             }
 144         )
 145     } else {
 146         None
 147     }
 148 }