backend/src/main.rs

   1 extern crate askama;
   2
   3 use std::{ sync::Mutex, env::args, fs::File, io::prelude::* };
   4 use actix_files as fs;
   5 use actix_web::{ get, web, Responder, middleware, App, HttpServer };
   6 use askama::Template;
   7 use ron::{ de::from_reader, ser::{ to_string_pretty, PrettyConfig } };
   8 use serde::{ Deserialize, Serialize };
   9 use cached::proc_macro::cached;
  10
  11 mod consts;
  12 mod minecraft_controller;
  13
  14 #[derive(Template)]
  15 #[template(path = "main.html")]
  16 struct MainTemplate {
  17     text_status: String,
  18     memory: String,
  19     load_average: String,
  20     uptime: String,
  21     world_size: String,
  22     active_players: String,
  23     last_backup: String,
  24 }
  25
  26 const VALUE_UNKNOWN: &str = "-";
  27
  28 #[cached(size = 1, time = 10)]
  29 fn get_minecraft_executable_information_cached(world_path: String, backup_path: String, rcon_password: String) -> Option<minecraft_controller::MinecraftExe> {
  30     minecraft_controller::get_minecraft_executable_information(&world_path, &backup_path, &rcon_password)
  31 }
  32
  33 #[get("/")]
  34 async fn main_page(config_shared: web::Data<Mutex<Config>>) -> impl Responder {
  35     let config = config_shared.lock().unwrap();
  36
  37     match get_minecraft_executable_information_cached(config.world_path.clone(), config.backup_path.clone(), config.rcon_password.clone()) {
  38         Some(info) =>
  39             MainTemplate {
  40                 text_status: String::from("Minecraft server is up and running :)"),
  41                 memory: info.format_memory(),
  42                 load_average: info.format_load_average(),
  43                 uptime: info.format_uptime(),
  44                 world_size: info.format_world_size(),
  45                 active_players: info.format_active_players(),
  46                 last_backup: info.format_last_backup()
  47             },
  48         None => {
  49             let value_unknown = String::from(VALUE_UNKNOWN);
  50             MainTemplate {
  51                 text_status: String::from("Minecraft server is down :("),
  52                 memory: value_unknown.clone(),
  53                 load_average: value_unknown.clone(),
  54                 uptime: value_unknown.clone(),
  55                 world_size: value_unknown.clone(),
  56                 active_players: value_unknown.clone(),
  57                 last_backup: value_unknown.clone()
  58             }
  59         }
  60     }
  61 }
  62
  63 #[derive(Debug, Deserialize, Serialize)]
  64 struct Config {
  65     port: u16,
  66
  67     #[serde(default = "empty_string")]
  68     rcon_password: String,
  69
  70     #[serde(default = "empty_string")]
  71     world_path: String,
  72
  73     #[serde(default = "empty_string")]
  74     backup_path: String,
  75 }
  76
  77 fn empty_string() -> String { "".to_owned() }
  78
  79 impl Config {
  80     fn default() -> Self {
  81         Config { port: 8083, rcon_password: String::from(""), world_path: String::from(""), backup_path: String::from("") }
  82     }
  83 }
  84
  85 fn get_exe_name() -> String {
  86     let first_arg = std::env::args().next().unwrap();
  87     let sep: &[_] = &['\\', '/'];
  88     first_arg[first_arg.rfind(sep).unwrap()+1..].to_string()
  89 }
  90
  91 fn load_config() -> Config {
  92     // unwrap_or_else(|_| panic!("Failed to open configuration file {}", consts::FILE_CONF));
  93     match File::open(consts::FILE_CONF) {
  94         Ok(file) => from_reader(file).unwrap_or_else(|_| panic!("Failed to open configuration file {}", consts::FILE_CONF)),
  95         Err(_) => {
  96             let mut file = File::create(consts::FILE_CONF) .unwrap();
  97             let default_config = Config::default();
  98             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.
  99             default_config
 100         }
 101     }
 102 }
 103
 104 #[actix_web::main]
 105 async fn main() -> std::io::Result<()> {
 106     let config = load_config();
 107     let port = config.port;
 108
 109     if process_args(&config) { return Ok(()) }
 110
 111     println!("Starting Minecraft Admin as web server...");
 112
 113     println!("Configuration: {:?}", config);
 114
 115     let config_shared = web::Data::new(Mutex::new(config));
 116
 117     let server =
 118         HttpServer::new(
 119             move || {
 120                 App::new()
 121                     .app_data(config_shared.clone())
 122                     .wrap(middleware::Compress::default())
 123                     .wrap(middleware::Logger::default())
 124                     .service(main_page)
 125                     .service(fs::Files::new("/static", "static").show_files_listing())
 126             }
 127         )
 128         .bind(&format!("0.0.0.0:{}", port))
 129         .unwrap();
 130
 131     server.run().await
 132 }
 133
 134 fn process_args(config: &Config) -> bool {
 135     fn print_usage() {
 136         println!("Usage:");
 137         println!(" {} [--help] [--status]", get_exe_name());
 138     }
 139
 140     let args: Vec<String> = args().collect();
 141
 142     if args.iter().any(|arg| arg == "--help") {
 143         print_usage();
 144         return true
 145     } else if args.iter().any(|arg| arg == "--status") {
 146         println!("{:?}", minecraft_controller::get_minecraft_executable_information(&config.world_path, &config.backup_path, &config.rcon_password));
 147         return true
 148     }
 149
 150     false
 151 }