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 valheim_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     nb_of_players: u32,
  25 }
  26
  27 const VALUE_UNKNOWN: &str = "-";
  28
  29 #[cached(size = 1, time = 10)]
  30 fn get_valheim_executable_information_cached(world_path: String) -> Option<valheim_controller::ValheimExe> {
  31     valheim_controller::get_valheim_executable_information(&world_path)
  32 }
  33
  34 #[get("/")]
  35 async fn main_page(config_shared: web::Data<Mutex<Config>>) -> impl Responder {
  36     let config = config_shared.lock().unwrap();
  37
  38     match get_valheim_executable_information_cached(config.world_path.clone()) {
  39         Some(info) =>
  40             MainTemplate {
  41                 text_status: String::from("Valheim server is up and running :)"),
  42                 memory: info.format_memory(),
  43                 load_average: info.format_load_average(),
  44                 uptime: info.format_uptime(),
  45                 world_size: info.format_world_size(),
  46                 nb_of_players: info.get_nb_of_player()
  47             },
  48         None => {
  49             let value_unknown = String::from(VALUE_UNKNOWN);
  50             MainTemplate { text_status: String::from("Valheim server is down :("), memory: value_unknown.clone(), load_average: value_unknown.clone(), uptime: value_unknown.clone(), world_size: value_unknown.clone(), nb_of_players: 0 }
  51         }
  52     }
  53 }
  54
  55 #[derive(Debug, Deserialize, Serialize)]
  56 struct Config {
  57     port: u16,
  58     #[serde(default = "empty_string")]
  59     world_path: String,
  60 }
  61
  62 fn empty_string() -> String { "".to_owned() }
  63
  64 impl Config {
  65     fn default() -> Self {
  66         Config { port: 8082, world_path: String::from("") }
  67     }
  68 }
  69
  70 fn get_exe_name() -> String {
  71     let first_arg = std::env::args().next().unwrap();
  72     let sep: &[_] = &['\\', '/'];
  73     first_arg[first_arg.rfind(sep).unwrap()+1..].to_string()
  74 }
  75
  76 fn load_config() -> Config {
  77     // unwrap_or_else(|_| panic!("Failed to open configuration file {}", consts::FILE_CONF));
  78     match File::open(consts::FILE_CONF) {
  79         Ok(file) => from_reader(file).unwrap_or_else(|_| panic!("Failed to open configuration file {}", consts::FILE_CONF)),
  80         Err(_) => {
  81             let mut file = File::create(consts::FILE_CONF) .unwrap();
  82             let default_config = Config::default();
  83             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.
  84             default_config
  85         }
  86     }
  87 }
  88
  89 #[actix_rt::main]
  90 async fn main() -> std::io::Result<()> {
  91     let config = load_config();
  92     let port = config.port;
  93
  94     if process_args(&config) { return Ok(()) }
  95
  96     println!("Starting Valheim Admin as web server...");
  97
  98     println!("Configuration: {:?}", config);
  99
 100     let config_shared = web::Data::new(Mutex::new(config));
 101
 102     let server =
 103         HttpServer::new(
 104             move || {
 105                 App::new()
 106                     .app_data(config_shared.clone())
 107                     .wrap(middleware::Compress::default())
 108                     .wrap(middleware::Logger::default())
 109                     .service(main_page)
 110                     .service(fs::Files::new("/static", "static").show_files_listing())
 111             }
 112         )
 113         .bind(&format!("0.0.0.0:{}", port))
 114         .unwrap();
 115
 116     server.run().await
 117 }
 118
 119 fn process_args(config: &Config) -> bool {
 120     fn print_usage() {
 121         println!("Usage:");
 122         println!(" {} [--help] [--status]", get_exe_name());
 123     }
 124
 125     let args: Vec<String> = args().collect();
 126
 127     if args.iter().any(|arg| arg == "--help") {
 128         print_usage();
 129         return true
 130     } else if args.iter().any(|arg| arg == "--status") {
 131         println!("{:?}", valheim_controller::get_valheim_executable_information(&config.world_path));
 132         return true
 133     }
 134
 135     false
 136 }