torrust-index-backend 2.0.0-alpha.3

use std::net::SocketAddr;
use std::sync::Arc;

use tokio::task::JoinHandle;

use crate::bootstrap::logging;
use crate::cache::image::manager::ImageCacheService;
use crate::common::AppData;
use crate::config::Configuration;
use crate::databases::database;
use crate::services::authentication::{DbUserAuthenticationRepository, JsonWebToken, Service};
use crate::services::category::{self, DbCategoryRepository};
use crate::services::tag::{self, DbTagRepository};
use crate::services::torrent::{
    DbTorrentAnnounceUrlRepository, DbTorrentFileRepository, DbTorrentInfoRepository, DbTorrentListingGenerator,
    DbTorrentRepository, DbTorrentTagRepository,
};
use crate::services::user::{self, DbBannedUserList, DbUserProfileRepository, DbUserRepository};
use crate::services::{proxy, settings, torrent};
use crate::tracker::statistics_importer::StatisticsImporter;
use crate::web::api::v1::auth::Authentication;
use crate::web::api::{start, Version};
use crate::{mailer, tracker};

pub struct Running {
    pub api_socket_addr: SocketAddr,
    pub api_server: Option<JoinHandle<std::result::Result<(), std::io::Error>>>,
    pub tracker_data_importer_handle: tokio::task::JoinHandle<()>,
}

/// Runs the application.
///
/// # Panics
///
/// It panics if there is an error connecting to the database.
#[allow(clippy::too_many_lines)]
pub async fn run(configuration: Configuration, api_version: &Version) -> Running {
    let log_level = configuration.settings.read().await.log_level.clone();

    logging::setup(&log_level);

    let configuration = Arc::new(configuration);

    // Get configuration settings needed to build the app dependencies and
    // services: main API server and tracker torrents importer.

    let settings = configuration.settings.read().await;

    let database_connect_url = settings.database.connect_url.clone();
    let torrent_info_update_interval = settings.tracker_statistics_importer.torrent_info_update_interval;
    let net_ip = "0.0.0.0".to_string();
    let net_port = settings.net.port;

    // IMPORTANT: drop settings before starting server to avoid read locks that
    // leads to requests hanging.
    drop(settings);

    // Build app dependencies

    let database = Arc::new(database::connect(&database_connect_url).await.expect("Database error."));
    let json_web_token = Arc::new(JsonWebToken::new(configuration.clone()));
    let auth = Arc::new(Authentication::new(json_web_token.clone()));

    // Repositories
    let category_repository = Arc::new(DbCategoryRepository::new(database.clone()));
    let tag_repository = Arc::new(DbTagRepository::new(database.clone()));
    let user_repository = Arc::new(DbUserRepository::new(database.clone()));
    let user_authentication_repository = Arc::new(DbUserAuthenticationRepository::new(database.clone()));
    let user_profile_repository = Arc::new(DbUserProfileRepository::new(database.clone()));
    let torrent_repository = Arc::new(DbTorrentRepository::new(database.clone()));
    let torrent_info_repository = Arc::new(DbTorrentInfoRepository::new(database.clone()));
    let torrent_file_repository = Arc::new(DbTorrentFileRepository::new(database.clone()));
    let torrent_announce_url_repository = Arc::new(DbTorrentAnnounceUrlRepository::new(database.clone()));
    let torrent_tag_repository = Arc::new(DbTorrentTagRepository::new(database.clone()));
    let torrent_listing_generator = Arc::new(DbTorrentListingGenerator::new(database.clone()));
    let banned_user_list = Arc::new(DbBannedUserList::new(database.clone()));

    // Services
    let tracker_service = Arc::new(tracker::service::Service::new(configuration.clone(), database.clone()).await);
    let tracker_statistics_importer =
        Arc::new(StatisticsImporter::new(configuration.clone(), tracker_service.clone(), database.clone()).await);
    let mailer_service = Arc::new(mailer::Service::new(configuration.clone()).await);
    let image_cache_service: Arc<ImageCacheService> = Arc::new(ImageCacheService::new(configuration.clone()).await);
    let category_service = Arc::new(category::Service::new(category_repository.clone(), user_repository.clone()));
    let tag_service = Arc::new(tag::Service::new(tag_repository.clone(), user_repository.clone()));
    let proxy_service = Arc::new(proxy::Service::new(image_cache_service.clone(), user_repository.clone()));
    let settings_service = Arc::new(settings::Service::new(configuration.clone(), user_repository.clone()));
    let torrent_index = Arc::new(torrent::Index::new(
        configuration.clone(),
        tracker_statistics_importer.clone(),
        tracker_service.clone(),
        user_repository.clone(),
        category_repository.clone(),
        torrent_repository.clone(),
        torrent_info_repository.clone(),
        torrent_file_repository.clone(),
        torrent_announce_url_repository.clone(),
        torrent_tag_repository.clone(),
        torrent_listing_generator.clone(),
    ));
    let registration_service = Arc::new(user::RegistrationService::new(
        configuration.clone(),
        mailer_service.clone(),
        user_repository.clone(),
        user_profile_repository.clone(),
    ));
    let ban_service = Arc::new(user::BanService::new(
        user_repository.clone(),
        user_profile_repository.clone(),
        banned_user_list.clone(),
    ));
    let authentication_service = Arc::new(Service::new(
        configuration.clone(),
        json_web_token.clone(),
        user_repository.clone(),
        user_profile_repository.clone(),
        user_authentication_repository.clone(),
    ));

    // Build app container

    let app_data = Arc::new(AppData::new(
        configuration.clone(),
        database.clone(),
        json_web_token.clone(),
        auth.clone(),
        authentication_service,
        tracker_service.clone(),
        tracker_statistics_importer.clone(),
        mailer_service,
        image_cache_service,
        category_repository,
        tag_repository,
        user_repository,
        user_authentication_repository,
        user_profile_repository,
        torrent_repository,
        torrent_info_repository,
        torrent_file_repository,
        torrent_announce_url_repository,
        torrent_tag_repository,
        torrent_listing_generator,
        banned_user_list,
        category_service,
        tag_service,
        proxy_service,
        settings_service,
        torrent_index,
        registration_service,
        ban_service,
    ));

    // Start repeating task to import tracker torrent data and updating
    // seeders and leechers info.

    let weak_tracker_statistics_importer = Arc::downgrade(&tracker_statistics_importer);

    let tracker_statistics_importer_handle = tokio::spawn(async move {
        let interval = std::time::Duration::from_secs(torrent_info_update_interval);
        let mut interval = tokio::time::interval(interval);
        interval.tick().await; // first tick is immediate...
        loop {
            interval.tick().await;
            if let Some(tracker) = weak_tracker_statistics_importer.upgrade() {
                let _ = tracker.import_all_torrents_statistics().await;
            } else {
                break;
            }
        }
    });

    // Start API server

    let running_api = start(app_data, &net_ip, net_port, api_version).await;

    Running {
        api_socket_addr: running_api.socket_addr,
        api_server: running_api.api_server,
        tracker_data_importer_handle: tracker_statistics_importer_handle,
    }
}