blog/backend/src/web/mod.rs

use actix_web::{get, http, web, HttpResponse};
use actix_web_static_files::ResourceFiles;
use anyhow::Result;
use askama_actix::TemplateToResponse;
use diesel::prelude::*;

use crate::{cache, db};

pub mod templates;

use templates::TemplateToResponseWithStatusCode;

pub mod static_dir {
    include!(concat!(env!("OUT_DIR"), "/generated.rs"));
}

async fn not_found() -> HttpResponse {
    templates::StatusCode {
        status_code: http::StatusCode::NOT_FOUND,
        message: Some("maybe try a correct url?".to_string()),
    }
    .to_response_with_status_code(http::StatusCode::NOT_FOUND)
}

#[get("/")]
async fn index() -> HttpResponse {
    templates::Index.to_response()
}

#[get("/about")]
async fn about() -> HttpResponse {
    templates::About.to_response()
}

pub fn get_tags_by_post(id: i32, db_conn: &mut diesel::PgConnection) -> Result<Vec<String>> {
    Ok(db::schema::tags::table
        .select(db::schema::tags::name)
        .filter(
            db::schema::tags::id.eq_any(
                db::schema::post_tags::table
                    .select(db::schema::post_tags::tag_id)
                    .filter(db::schema::post_tags::post_id.eq(id))
                    .load::<i32>(db_conn)?,
            ),
        )
        .order(db::schema::tags::name)
        .load::<String>(db_conn)?)
}

#[get("/posts")]
async fn posts(
    db_pool: web::Data<db::DbPool>,
    redis_pool: web::Data<cache::RedisPool>,
) -> HttpResponse {
    let db_conn = &mut match db_pool.get() {
        Ok(x) => x,
        Err(_) => return HttpResponse::InternalServerError().finish(),
    };
    let redis_conn = &mut match redis_pool.get() {
        Ok(x) => x,
        Err(_) => return HttpResponse::InternalServerError().finish(),
    };

    let posts = match cache::cache_posts(db_conn, redis_conn) {
        Ok(x) => x,
        Err(_) => return HttpResponse::InternalServerError().finish(),
    };

    templates::Posts { posts }.to_response()
}

#[get("/posts/{slug}")]
async fn post_by_slug(
    db_pool: web::Data<db::DbPool>,
    redis_pool: web::Data<cache::RedisPool>,
    path: web::Path<String>,
) -> HttpResponse {
    let slug = path.into_inner();

    let db_conn = &mut match db_pool.get() {
        Ok(x) => x,
        Err(_) => return HttpResponse::InternalServerError().finish(),
    };
    let redis_conn = &mut match redis_pool.get() {
        Ok(x) => x,
        Err(_) => return HttpResponse::InternalServerError().finish(),
    };

    if let Some(post_id) = match db::schema::posts::table
        .select(db::schema::posts::id)
        .filter(db::schema::posts::slug.eq(slug))
        .filter(db::schema::posts::active)
        .first::<i32>(db_conn)
        .optional()
    {
        Ok(x) => x,
        Err(_) => return HttpResponse::InternalServerError().finish(),
    } {
        let post = match cache::cache_post(post_id, db_conn, redis_conn) {
            Ok(x) => x,
            Err(_) => return HttpResponse::InternalServerError().finish(),
        };

        templates::PostBySlug { post }.to_response()
    } else {
        templates::StatusCode {
            status_code: http::StatusCode::NOT_FOUND,
            message: Some("this post does not exists... yet".to_string()),
        }
        .to_response_with_status_code(http::StatusCode::NOT_FOUND)
    }
}

#[get("/tags")]
async fn tags(
    db_pool: web::Data<db::DbPool>,
    redis_pool: web::Data<cache::RedisPool>,
) -> HttpResponse {
    let db_conn = &mut match db_pool.get() {
        Ok(x) => x,
        Err(_) => return HttpResponse::InternalServerError().finish(),
    };
    let redis_conn = &mut match redis_pool.get() {
        Ok(x) => x,
        Err(_) => return HttpResponse::InternalServerError().finish(),
    };

    let x = match cache::cache_tags(db_conn, redis_conn) {
        Ok(x) => x,
        Err(_) => return HttpResponse::InternalServerError().finish(),
    };

    templates::Tags { tags: x }.to_response()
}

#[get("/tags/{name}")]
async fn tag_by_name(
    db_pool: web::Data<db::DbPool>,
    redis_pool: web::Data<cache::RedisPool>,
    path: web::Path<String>,
) -> HttpResponse {
    const MESSAGE: &str = "this post does not exists... yet";

    let name = path.into_inner();

    let db_conn = &mut match db_pool.get() {
        Ok(x) => x,
        Err(_) => return HttpResponse::InternalServerError().finish(),
    };
    let redis_conn = &mut match redis_pool.get() {
        Ok(x) => x,
        Err(_) => return HttpResponse::InternalServerError().finish(),
    };

    let tag_id = match db::schema::tags::table
        .select(db::schema::tags::id)
        .filter(db::schema::tags::name.eq(&name))
        .first::<i32>(db_conn)
    {
        Ok(x) => x,
        Err(_) => return HttpResponse::InternalServerError().finish(),
    };
    let posts_cache = match cache::cache_tag_posts(tag_id, db_conn, redis_conn) {
        Ok(x) => x,
        Err(_) => return HttpResponse::InternalServerError().finish(),
    };

    templates::TagByName {
        name,
        posts: posts_cache,
    }
    .to_response()
}

fn setup_routes(cfg: &mut web::ServiceConfig) {
    let generated = static_dir::generate();

    cfg.service(index)
        .service(about)
        .service(posts)
        .service(ResourceFiles::new("/static", generated))
        .service(post_by_slug)
        .service(tags)
        .service(tag_by_name)
        .default_service(web::route().to(not_found));
}

pub fn init(cfg: &mut web::ServiceConfig) {
    cfg.app_data(web::Data::new(db::pool().unwrap()))
        .app_data(web::Data::new(cache::pool().unwrap()));

    setup_routes(cfg);
}