backend/src/main.rs

   1 extern crate askama;
   2
   3 use std::{ sync::Mutex, env::args, fs::File, io::prelude::* };
   4
   5 use actix_files as fs;
   6 use actix_web::{ get, web, Responder, middleware, App, HttpServer };
   7 use askama::Template;
   8 use ron::{ de::from_reader, ser::{ to_string_pretty, PrettyConfig } };
   9 use serde::{ Deserialize, Serialize };
  10 use cached::proc_macro::cached;
  11
  12 mod consts;
  13 mod tests;
  14 mod minecraft_controller;
  15
  16 #[derive(Template)]
  17 #[template(path = "main.html")]
  18 struct MainTemplate {
  19     text_status: String,
  20     memory: String,
  21     load_average: String,
  22     uptime: String,
  23     world_size: String,
  24     active_players: String,
  25     last_backup: String,
  26 }
  27
  28 const VALUE_UNKNOWN: &str = "-";
  29
  30 #[cached(size = 1, time = 10)]
  31 fn get_minecraft_executable_information_cached(world_path: String, backup_path: String) -> Option<minecraft_controller::MinecraftExe> {
  32     minecraft_controller::get_minecraft_executable_information(&world_path, &backup_path)
  33 }
  34
  35 #[get("/")]
  36 async fn main_page(config_shared: web::Data<Mutex<Config>>) -> impl Responder {
  37     let config = config_shared.lock().unwrap();
  38
  39     match get_minecraft_executable_information_cached(config.world_path.clone(), config.backup_path.clone()) {
  40         Some(info) =>
  41             MainTemplate {
  42                 text_status: String::from("Minecraft server is up and running :)"),
  43                 memory: info.format_memory(),
  44                 load_average: info.format_load_average(),
  45                 uptime: info.format_uptime(),
  46                 world_size: info.format_world_size(),
  47                 active_players: info.format_active_players(),
  48                 last_backup: info.format_last_backup()
  49             },
  50         None => {
  51             let value_unknown = String::from(VALUE_UNKNOWN);
  52             MainTemplate {
  53                 text_status: String::from("Minecraft server is down :("),
  54                 memory: value_unknown.clone(),
  55                 load_average: value_unknown.clone(),
  56                 uptime: value_unknown.clone(),
  57                 world_size: value_unknown.clone(),
  58                 active_players: value_unknown.clone(),
  59                 last_backup: value_unknown.clone() }
  60         }
  61     }
  62 }
  63
  64 #[derive(Debug, Deserialize, Serialize)]
  65 struct Config {
  66     port: u16,
  67
  68     #[serde(default = "empty_string")]
  69     rcon_password: String,
  70
  71     #[serde(default = "empty_string")]
  72     world_path: String,
  73
  74     #[serde(default = "empty_string")]
  75     backup_path: String,
  76 }
  77
  78 fn empty_string() -> String { "".to_owned() }
  79
  80 impl Config {
  81     fn default() -> Self {
  82         Config { port: 8083, rcon_password: String::from(""), world_path: String::from(""), backup_path: String::from("") }
  83     }
  84 }
  85
  86 fn get_exe_name() -> String {
  87     let first_arg = std::env::args().next().unwrap();
  88     let sep: &[_] = &['\\', '/'];
  89     first_arg[first_arg.rfind(sep).unwrap()+1..].to_string()
  90 }
  91
  92 fn load_config() -> Config {
  93     // unwrap_or_else(|_| panic!("Failed to open configuration file {}", consts::FILE_CONF));
  94     match File::open(consts::FILE_CONF) {
  95         Ok(file) => from_reader(file).unwrap_or_else(|_| panic!("Failed to open configuration file {}", consts::FILE_CONF)),
  96         Err(_) => {
  97             let mut file = File::create(consts::FILE_CONF) .unwrap();
  98             let default_config = Config::default();
  99             file.write_all(to_string_pretty(&default_config, PrettyConfig::new()).unwrap().as_bytes()).unwrap(); // We do not use 'to_writer' because it can't pretty format the output.
 100             default_config
 101         }
 102     }
 103 }
 104
 105 #[actix_web::main]
 106 async fn main() -> std::io::Result<()> {
 107     let config = load_config();
 108     let port = config.port;
 109
 110     if process_args(&config) { return Ok(()) }
 111
 112     println!("Starting Minecraft Admin as web server...");
 113
 114     println!("Configuration: {:?}", config);
 115
 116     let config_shared = web::Data::new(Mutex::new(config));
 117
 118     let server =
 119         HttpServer::new(
 120             move || {
 121                 App::new()
 122                     .app_data(config_shared.clone())
 123                     .wrap(middleware::Compress::default())
 124                     .wrap(middleware::Logger::default())
 125                     .service(main_page)
 126                     .service(fs::Files::new("/static", "static").show_files_listing())
 127             }
 128         )
 129         .bind(&format!("0.0.0.0:{}", port))
 130         .unwrap();
 131
 132     server.run().await
 133 }
 134
 135 fn process_args(config: &Config) -> bool {
 136     fn print_usage() {
 137         println!("Usage:");
 138         println!(" {} [--help] [--status]", get_exe_name());
 139     }
 140
 141     let args: Vec<String> = args().collect();
 142
 143     if args.iter().any(|arg| arg == "--help") {
 144         print_usage();
 145         return true
 146     } else if args.iter().any(|arg| arg == "--status") {
 147         println!("{:?}", minecraft_controller::get_minecraft_executable_information(&config.world_path, &config.backup_path));
 148         return true
 149     }
 150
 151     false
 152 }