backend/src/minecraft_controller.rs

   1 use std::{ fs, time::SystemTime };
   2 use sysinfo::{ ProcessExt, SystemExt };
   3 use chrono::{ DateTime, offset::Local };
   4
   5 #[derive(Clone, Debug)]
   6 pub struct MinecraftExe {
   7     memory: u64, // [kB].
   8     load_average_5min: f64, // [%].
   9     uptime: u64, // [s].
  10     world_size: u64, // [B].
  11     active_players: Vec<String>,
  12     last_backup: Option<SystemTime>,
  13 }
  14
  15 impl MinecraftExe {
  16     pub fn format_memory(&self) -> String {
  17         format_byte_size(self.memory * 1024, 2)
  18     }
  19
  20     pub fn format_load_average(&self) -> String {
  21         format!("{:.2} %", self.load_average_5min)
  22     }
  23
  24     pub fn format_uptime(&self) -> String {
  25         let mins = self.uptime / 60;
  26         let hours = mins / 60;
  27         let days = hours / 24;
  28         format!("{}d {}h {}min", days, hours - 24 * days, mins - 60 * hours)
  29     }
  30
  31     pub fn format_world_size(&self) -> String {
  32         format_byte_size(self.world_size, 2)
  33     }
  34
  35     pub fn format_active_players(&self) -> String {
  36         if self.active_players.len() == 0 {
  37             String::from("<none>")
  38         } else {
  39             self.active_players.join(", ")
  40         }
  41     }
  42
  43     pub fn format_last_backup(&self) -> String {
  44         match self.last_backup {
  45             Some(t) => {
  46                 let datetime: DateTime<Local> = t.into();
  47                 datetime.format("%d/%m/%Y %T").to_string()
  48             },
  49             None => String::from("?")
  50         }
  51     }
  52 }
  53
  54 const BINARY_PREFIXES: [&str; 8] = ["B", "KiB", "MiB", "GiB", "TiB", "PiB", "EiB", "ZiB"];
  55
  56 fn format_byte_size(bytes: u64, precision: usize) -> String {
  57     for i in 0 .. 8 {
  58         let mut size: u64 = 1;
  59         size *= 1024u64.pow(i as u32);
  60
  61         if bytes < 1024 {
  62             return format!("{} {}", std::cmp::max(0u64, bytes), BINARY_PREFIXES[i]);
  63         }
  64         else if bytes < 1024 * size {
  65             return format!("{:.prec$} {}", bytes as f64 / size as f64, BINARY_PREFIXES[i], prec = precision);
  66         }
  67     }
  68
  69     String::from("")
  70 }
  71
  72 const MINECRAFT_PROCESS_NAME: &str = "java";
  73
  74 struct StatusFromRcon {
  75     players: Vec<String>,
  76 }
  77
  78 fn get_status_from_rcon(rcon_password: &str) -> StatusFromRcon {
  79     let mut client = minecraft_client_rs::Client::new("127.0.0.1:25575".to_string()).unwrap();
  80
  81     let status =
  82         match client.authenticate(rcon_password.to_string()) {
  83             Ok(_) => {
  84                 StatusFromRcon {
  85                     players:
  86                         match client.send_command("list".to_string()) {
  87                             Ok(resp) =>
  88                                 match resp.body.find(':') {
  89                                     Some(i) if i < resp.body.len() -1 =>
  90                                         resp.body[i + 1..resp.body.len()]
  91                                             .split(',')
  92                                             .map(|nick| nick.trim().to_string())
  93                                             .filter(|nick| !nick.is_empty())
  94                                             .collect(),
  95                                     _ => Vec::new()
  96                                 },
  97                             Err(_e) => {
  98                                 println!("Error from 'list' command");
  99                                 Vec::new()
 100                             },
 101                         }
 102                 }
 103             },
 104             Err(_e) => {
 105                 println!("Authentication error");
 106                 StatusFromRcon { players: Vec::new() }
 107             },
 108         };
 109
 110     client.close().unwrap();
 111
 112     status
 113 }
 114
 115 fn get_last_backup_datetime(backup_path: &str) -> Option<SystemTime> {
 116     let mut times =
 117         fs::read_dir(backup_path).ok()?.filter_map(
 118             |e| {
 119                 let dir = e.ok()?;
 120                 if dir.path().is_file() { Some(dir.metadata().ok()?.modified().ok()?) } else { None }
 121             }
 122         )
 123         .collect::<Vec<SystemTime>>();
 124
 125     times.sort();
 126
 127     Some(times.last()?.clone())
 128 }
 129
 130 pub fn get_minecraft_executable_information(world_path: &str, backup_path: &str, rcon_password: &str) -> Option<MinecraftExe> {
 131     let mut system = sysinfo::System::new_all();
 132     system.refresh_system();
 133     let processes = system.get_process_by_name(MINECRAFT_PROCESS_NAME);
 134
 135     // TODO: find the correct process by checking the correct jar name in parameters.
 136     if processes.len() >= 1 {
 137         let process = processes.first().unwrap();
 138
 139         let world_size = match fs_extra::dir::get_size(world_path) { Ok(l) => l, Err(_) => 0u64 };
 140
 141         let status_from_rcon = get_status_from_rcon(rcon_password);
 142
 143         Some(
 144             MinecraftExe {
 145                 memory: process.memory() / 3, // Because the Java garbage collector ZGC reports three times more the real memory usage: https://stackoverflow.com/a/62934057/212675
 146                 load_average_5min: system.get_load_average().five / system.get_processors().len() as f64 * 100.,
 147                 uptime: std::time::SystemTime::now().duration_since(std::time::UNIX_EPOCH).unwrap().as_secs() - process.start_time(),
 148                 world_size,
 149                 active_players: status_from_rcon.players,
 150                 last_backup: get_last_backup_datetime(backup_path)
 151             }
 152         )
 153     } else {
 154         None
 155     }
 156 }