//! Setup for the main tracker application.

//!

//! The [`setup`] only builds the application and its dependencies but it does not start the application.

//! In fact, there is no such thing as the main application process. When the application starts, the only thing it does is

//! starting a bunch of independent jobs. If you are looking for how things are started you should read [`app::start`](crate::app::start)

//! function documentation.

//!

//! Setup steps:

//!

//! 1. Load the global application configuration.

//! 2. Initialize static variables.

//! 3. Initialize logging.

//! 4. Initialize the domain tracker.

use bittorrent_udp_tracker_core::crypto::keys::{self, Keeper as _};

use torrust_tracker_configuration::validator::Validator;

use torrust_tracker_configuration::{logging, Configuration};

use tracing::instrument;

use super::config::initialize_configuration;

use crate::container::AppContainer;

/// It loads the configuration from the environment and builds app container.

///

/// # Panics

///

/// Setup can file if the configuration is invalid.

#[must_use]

#[instrument(skip())]

pub fn setup() -> (Configuration, AppContainer) {

#[cfg(not(test))]

check_seed();

let configuration = initialize_configuration();

if let Err(e) = configuration.validate() {

panic!("Configuration error: {e}");

}

initialize_global_services(&configuration);

tracing::info!("Configuration:\n{}", configuration.clone().mask_secrets().to_json());

let app_container = AppContainer::initialize(&configuration);

(configuration, app_container)

}

/// checks if the seed is the instance seed in production.

///

/// # Panics

///

/// It would panic if the seed is not the instance seed.

pub fn check_seed() {

let seed = keys::Current::get_seed();

let instance = keys::Instance::get_seed();

assert_eq!(seed, instance, "maybe using zeroed seed in production!?");

}

/// It initializes the global services.

#[instrument(skip())]

pub fn initialize_global_services(configuration: &Configuration) {

initialize_static();

logging::setup(&configuration.logging);

}

/// It initializes the application static values.

///

/// These values are accessible throughout the entire application:

///

/// - The time when the application started.

/// - An ephemeral instance random seed. This seed is used for encryption and

/// it's changed when the main application process is restarted.

#[instrument(skip())]

pub fn initialize_static() {

torrust_tracker_clock::initialize_static();

bittorrent_udp_tracker_core::initialize_static();

}