AppFlowy/backend/src/application.rs

use actix::Actor;
use actix_identity::{CookieIdentityPolicy, IdentityService};
use actix_web::{dev::Server, middleware, web, web::Data, App, HttpServer, Scope};
use sqlx::{postgres::PgPoolOptions, PgPool};
use std::{net::TcpListener, time::Duration};
use tokio::time::interval;

use crate::{
    config::{
        env::{domain, secret, use_https},
        DatabaseSettings,
        Settings,
    },
    context::AppContext,
    services::{
        document::router as doc,
        folder::{app::router as app, trash::router as trash, view::router as view, workspace::router as workspace},
        user::router as user,
        web_socket::WSServer,
    },
};

pub struct Application {
    port: u16,
    server: Server,
}

impl Application {
    pub async fn build(configuration: Settings, app_ctx: AppContext) -> Result<Self, std::io::Error> {
        let address = format!("{}:{}", configuration.application.host, configuration.application.port);
        let listener = TcpListener::bind(&address)?;
        let port = listener.local_addr().unwrap().port();
        let server = run(listener, app_ctx)?;
        Ok(Self { port, server })
    }

    pub async fn run_until_stopped(self) -> Result<(), std::io::Error> { self.server.await }

    pub fn port(&self) -> u16 { self.port }
}

pub fn run(listener: TcpListener, app_ctx: AppContext) -> Result<Server, std::io::Error> {
    let domain = domain();
    let secret: String = secret();
    actix_rt::spawn(period_check(app_ctx.persistence.pg_pool()));

    let server = HttpServer::new(move || {
        App::new()
            .wrap(middleware::Logger::default())
            .wrap(identify_service(&domain, &secret))
            .wrap(crate::middleware::default_cors())
            .wrap(crate::middleware::AuthenticationService)
            .app_data(web::JsonConfig::default().limit(4096))
            .service(ws_scope())
            .service(user_scope())
            .app_data(app_ctx.ws_server.clone())
            .app_data(app_ctx.persistence.clone())
            .app_data(Data::new(app_ctx.persistence.pg_pool()))
            .app_data(app_ctx.ws_receivers.clone())
            .app_data(app_ctx.document_manager.clone())
    })
    .listen(listener)?
    .run();
    Ok(server)
}

#[allow(dead_code)]
async fn period_check(_pool: PgPool) {
    let mut i = interval(Duration::from_secs(60));
    loop {
        i.tick().await;
    }
}

fn ws_scope() -> Scope { web::scope("/ws").service(crate::services::web_socket::router::establish_ws_connection) }

fn user_scope() -> Scope {
    // https://developer.mozilla.org/en-US/docs/Web/HTTP
    // TODO: replace GET body with query params
    web::scope("/api")
        // authentication
        .service(web::resource("/auth")
            .route(web::post().to(user::sign_in_handler))
            .route(web::delete().to(user::sign_out_handler))
        )
        .service(web::resource("/user")
            .route(web::patch().to(user::set_user_profile_handler))
            .route(web::get().to(user::get_user_profile_handler))
        )
        .service(web::resource("/register")
            .route(web::post().to(user::register_handler))
        )
        .service(web::resource("/workspace")
            .route(web::post().to(workspace::create_handler))
            .route(web::delete().to(workspace::delete_handler))
            .route(web::get().to(workspace::read_handler))
            .route(web::patch().to(workspace::update_handler))
        )
        .service(web::resource("/workspace_list/{user_id}")
            .route(web::get().to(workspace::workspace_list))
        )
        .service(web::resource("/app")
            .route(web::post().to(app::create_handler))
            .route(web::get().to(app::read_handler))
            .route(web::delete().to(app::delete_handler))
            .route(web::patch().to(app::update_handler))
        )
        .service(web::resource("/view")
            .route(web::post().to(view::create_handler))
            .route(web::delete().to(view::delete_handler))
            .route(web::get().to(view::read_handler))
            .route(web::patch().to(view::update_handler))
        )
        .service(web::resource("/doc")
            .route(web::post().to(doc::create_document_handler))
            .route(web::get().to(doc::read_document_handler))
            .route(web::patch().to(doc::reset_document_handler))
        )
        .service(web::resource("/trash")
            .route(web::post().to(trash::create_handler))
            .route(web::delete().to(trash::delete_handler))
            .route(web::get().to(trash::read_handler))
        )
        .service(web::resource("/sync")
            .route(web::post().to(trash::create_handler))
        )
        // password
        .service(web::resource("/password_change")
            .route(web::post().to(user::change_password))
        )
}

pub async fn init_app_context(configuration: &Settings) -> AppContext {
    let _ = crate::services::log::Builder::new("flowy-server")
        .env_filter("Trace")
        .build();
    let pg_pool = get_connection_pool(&configuration.database)
        .await
        .unwrap_or_else(|_| panic!("Failed to connect to Postgres at {:?}.", configuration.database));

    let ws_server = WSServer::new().start();
    AppContext::new(ws_server, pg_pool)
}

pub fn identify_service(domain: &str, secret: &str) -> IdentityService<CookieIdentityPolicy> {
    IdentityService::new(
        CookieIdentityPolicy::new(secret.as_bytes())
            .name("auth")
            .path("/")
            .domain(domain)
            .max_age_secs(24 * 3600)
            .secure(use_https()),
    )
}

pub async fn get_connection_pool(configuration: &DatabaseSettings) -> Result<PgPool, sqlx::Error> {
    PgPoolOptions::new()
        .connect_timeout(std::time::Duration::from_secs(5))
        .connect_with(configuration.with_db())
        .await
}