//! Documentation for [Torrust Tracker Index Backend](https://github.com/torrust/torrust-index-backend) API.
//!
//! This is the backend API for [Torrust Tracker Index](https://github.com/torrust/torrust-index).
//!
//! It is written in Rust and uses the [Axum](https://github.com/tokio-rs/axum) framework. It is designed to be
//! used with by the [Torrust Tracker Index Frontend](https://github.com/torrust/torrust-index-frontend).
//!
//! If you are looking for information on how to use the API, please see the
//! [API v1](crate::web::api::v1) section of the documentation.
//!
//! # Table of contents
//!
//! - [Features](#features)
//! - [Services](#services)
//! - [Installation](#installation)
//!     - [Minimum requirements](#minimum-requirements)
//!     - [Prerequisites](#prerequisites)
//!     - [Install from sources](#install-from-sources)
//!     - [Run with docker](#run-with-docker)
//!     - [Development](#development)
//! - [Configuration](#configuration)
//! - [Usage](#usage)
//!     - [API](#api)
//!     - [Tracker Statistics Importer](#tracker-statistics-importer)
//!     - [Upgrader](#upgrader)
//! - [Contributing](#contributing)
//! - [Documentation](#documentation)
//!
//! # Features
//!
//! - Torrent categories
//! - Image proxy cache for torrent descriptions
//! - User registration and authentication
//! - DB Support for `SQLite` and `MySQl`
//!
//! # Services
//!
//! From the end-user perspective the Torrust Tracker exposes three different services.
//!
//! - A REST [API](crate::web::api::v1)
//!
//! From the administrator perspective, the Torrust Index Backend exposes:
//!
//! - A console command to update torrents statistics from the associated tracker
//! - A console command to upgrade the database schema from version `1.0.0` to `2.0.0`
//!
//! # Installation
//!
//! ## Minimum requirements
//!
//! - Rust Stable `1.68`
//!
//! ## Prerequisites
//!
//! In order the run the backend you will need a running torrust tracker. In the
//! configuration you need to fill the `backend` section with the following:
//!
//! ```toml
//! [tracker]
//! url = "udp://localhost:6969"
//! mode = "Public"
//! api_url = "http://localhost:1212"
//! token = "MyAccessToken"
//! token_valid_seconds = 7257600
//! ```
//!
//! Refer to the [`config::tracker`](crate::config::Tracker) documentation for more information.
//!
//! You can follow the tracker installation instructions [here](https://docs.rs/torrust-tracker)
//! or you can use the docker to run both the tracker and the backend. Refer to the
//! [Run with docker](#run-with-docker) section for more information.
//!
//! If you are using `SQLite3` as database driver, you will need to install the
//! following dependency:
//!
//! ```text
//! sudo apt-get install libsqlite3-dev
//! ```
//!
//! > **NOTICE**: those are the commands for `Ubuntu`. If you are using a
//! different OS, you will need to install the equivalent packages. Please
//! refer to the documentation of your OS.
//!
//! With the default configuration you will need to create the `storage` directory:
//!
//! ```text
//! storage/
//! └── database
//!     └── data.db
//! ```
//!
//! The default configuration expects a directory `./storage/database` to be writable by the app process.
//!
//! By default the backend uses `SQLite` and the database file name `data.db`.
//!
//! ## Install from sources
//!
//! ```text
//! git clone git@github.com:torrust/torrust-index-backend.git \
//!   && cd torrust-index-backend \
//!   && cargo build --release \
//!   && mkdir -p ./storage/database
//! ```
//!
//! Then you can run it with: `./target/release/main`
//!
//! ## Run with docker
//!
//! You can run the backend with a pre-built docker image:
//!
//! ```text
//! mkdir -p ./storage/database \
//!   && export TORRUST_IDX_BACK_USER_UID=1000 \
//!   && docker run -it \
//!     --user="$TORRUST_IDX_BACK_USER_UID" \
//!     --publish 3000:3000/tcp \
//!     --volume "$(pwd)/storage":"/app/storage" \
//!     torrust/index-backend
//! ```
//!
//! For more information about using docker visit the [tracker docker documentation](https://github.com/torrust/torrust-index-backend/tree/develop/docker).
//!
//! ## Development
//!
//! We are using the [The Rust SQL Toolkit](https://github.com/launchbadge/sqlx)
//! [(sqlx)](https://github.com/launchbadge/sqlx) for database migrations.
//!
//! You can install it with:
//!
//! ```text
//! cargo install sqlx-cli
//! ```
//!
//! To initialize the database run:
//!
//! ```text
//! echo "DATABASE_URL=sqlite://data.db?mode=rwc" > .env
//! sqlx db setup
//! ```
//!
//! The `sqlx db setup` command will create the database specified in your
//! `DATABASE_URL` and run any pending migrations.
//!
//! > **WARNING**: The `.env` file is also used by docker-compose.
//!
//! > **NOTICE**: Refer to the [sqlx-cli](https://github.com/launchbadge/sqlx/tree/main/sqlx-cli)
//! documentation for other commands to create new migrations or run them.
//!
//! > **NOTICE**: You can run the backend with [tmux](https://github.com/tmux/tmux/wiki) with `tmux new -s torrust-index-backend`.
//!
//! # Configuration
//! In order to run the backend you need to provide the configuration. If you run the backend without providing the configuration,
//! the tracker will generate the default configuration the first time you run it. It will generate a `config.toml` file with
//! in the root directory.
//!
//! The default configuration is:
//!
//! ```toml
//! [website]
//! name = "Torrust"
//!
//! [tracker]
//! url = "udp://localhost:6969"
//! mode = "Public"
//! api_url = "http://localhost:1212"
//! token = "MyAccessToken"
//! token_valid_seconds = 7257600
//!
//! [net]
//! port = 3000
//!
//! [auth]
//! email_on_signup = "Optional"
//! min_password_length = 6
//! max_password_length = 64
//! secret_key = "MaxVerstappenWC2021"
//!
//! [database]
//! connect_url = "sqlite://data.db?mode=rwc"
//!
//! [mail]
//! email_verification_enabled = false
//! from = "example@email.com"
//! reply_to = "noreply@email.com"
//! username = ""
//! password = ""
//! server = ""
//! port = 25
//!
//! [image_cache]
//! max_request_timeout_ms = 1000
//! capacity = 128000000
//! entry_size_limit = 4000000
//! user_quota_period_seconds = 3600
//! user_quota_bytes = 64000000
//!
//! [api]
//! default_torrent_page_size = 10
//! max_torrent_page_size = 30
//!
//! [tracker_statistics_importer]
//! torrent_info_update_interval = 3600
//! ```
//!
//! For more information about configuration you can visit the documentation for the [`config`](crate::config) module.
//!
//! Alternatively to the `config.toml` file you can use one environment variable `TORRUST_IDX_BACK_CONFIG` to pass the configuration to the tracker:
//!
//! ```text
//! TORRUST_IDX_BACK_CONFIG=$(cat config.toml)
//! cargo run
//! ```
//!
//! In the previous example you are just setting the env var with the contents of the `config.toml` file.
//!
//! The env var contains the same data as the `config.toml`. It's particularly useful in you are [running the backend with docker](https://github.com/torrust/torrust-index-backend/tree/develop/docker).
//!
//! > **NOTICE**: The `TORRUST_IDX_BACK_CONFIG` env var has priority over the `config.toml` file.
//!
//! > **NOTICE**: You can also change the location for the configuration file with the `TORRUST_IDX_BACK_CONFIG_PATH` env var.
//!
//! # Usage
//!
//! ## API
//!
//! Running the tracker with the default configuration will expose the REST API on port 3000: <http://localhost:3000>
//!
//! ## Tracker Statistics Importer
//!
//! This console command allows you to manually import the tracker statistics.
//!
//! For more information about this command you can visit the documentation for
//! the [`Import tracker statistics`](crate::console::commands::import_tracker_statistics) module.
//!
//! ## Upgrader
//!
//! This console command allows you to manually upgrade the application from one
//! version to another.
//!
//! For more information about this command you can visit the documentation for
//! the [`Upgrade app from version 1.0.0 to 2.0.0`](crate::upgrades::from_v1_0_0_to_v2_0_0::upgrader) module.
//!
//! # Contributing
//!
//! If you want to contribute to this documentation you can:
//!
//! - [Open a new discussion](https://github.com/torrust/torrust-index-backend/discussions)
//! - [Open a new issue](https://github.com/torrust/torrust-index-backend/issues).
//! - [Open a new pull request](https://github.com/torrust/torrust-index-backend/pulls).
//!
//! # Documentation
//!
//! You can find this documentation on [docs.rs](https://docs.rs/torrust-index-backend/).
//!
//! If you want to contribute to this documentation you can [open a new pull request](https://github.com/torrust/torrust-index-backend/pulls).
//!
//! In addition to the production code documentation you can find a lot of
//! examples in the [tests](https://github.com/torrust/torrust-index-backend/tree/develop/tests/e2e/contexts) directory.
pub mod app;
pub mod bootstrap;
pub mod cache;
pub mod common;
pub mod config;
pub mod console;
pub mod databases;
pub mod errors;
pub mod mailer;
pub mod models;
pub mod services;
pub mod tracker;
pub mod ui;
pub mod upgrades;
pub mod utils;
pub mod web;

trait AsCSV {
    fn as_csv<T>(&self) -> Result<Option<Vec<T>>, ()>
    where
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}

impl<S> AsCSV for Option<S>
where
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{
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    where
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}