haro 0.3.0

A simple and synchronous web framework written in and for Rust
Documentation 
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//! Database utilities
use mysql::{Opts, OptsBuilder};
use once_cell::sync::OnceCell;
use r2d2::{Pool, PooledConnection};
use r2d2_mysql::MySqlConnectionManager;
use r2d2_postgres::{postgres::NoTls, PostgresConnectionManager};
use r2d2_sqlite::SqliteConnectionManager;

static GLOBAL_PG_POOL: OnceCell<Pool<PostgresConnectionManager<NoTls>>> = OnceCell::new();
static GLOBAL_MY_POOL: OnceCell<Pool<MySqlConnectionManager>> = OnceCell::new();
static GLOBAL_SQLITE_POOL: OnceCell<Pool<SqliteConnectionManager>> = OnceCell::new();

/// Initializing a global connection pool and retrieve a connection.
pub struct Postgres {}
impl Postgres {
    /// Initialize a global Postgres connection pool by provided `url`
    /// # Example
    /// ```no_run
    /// use haro::db;
    ///
    /// db::Postgres::init("postgres://postgres:postgres@localhost:5432/test")
    /// ```
    pub fn init(url: &str) {
        let manager = PostgresConnectionManager::new(url.parse().unwrap(), NoTls);
        let pool = r2d2::Pool::new(manager).unwrap();
        GLOBAL_PG_POOL.set(pool).unwrap();
    }

    /// Retrieve a connection from the global Postgres connection pool
    /// # Example
    /// ```no_run
    /// use haro::db;
    ///
    /// let client = db::Postgres::get();
    /// ```
    pub fn get() -> PooledConnection<PostgresConnectionManager<NoTls>> {
        let pool = GLOBAL_PG_POOL.get().unwrap().clone();
        pool.get().unwrap()
    }
}

/// Initializing a global connection pool and retrieve a connection.
pub struct MySQL {}
impl MySQL {
    /// Initialize a global MySQL connection pool by provided `url`
    /// # Example
    /// ```no_run
    /// use haro::db;
    ///
    /// db::MySQL::init("mysql://root:root@localhost:3306/test")
    /// ```
    pub fn init(url: &str) {
        let opts = Opts::from_url(url).unwrap();
        let builder = OptsBuilder::from_opts(opts);
        let manager = MySqlConnectionManager::new(builder);
        let pool = r2d2::Pool::new(manager).unwrap();
        GLOBAL_MY_POOL.set(pool).unwrap();
    }

    /// Retrieve a connection from the global MySQL connection pool
    /// # Example
    /// ```no_run
    /// use haro::db;
    ///
    /// let client = db::MySQL::get();
    /// ```
    pub fn get() -> PooledConnection<MySqlConnectionManager> {
        let pool = GLOBAL_MY_POOL.get().unwrap().clone();
        pool.get().unwrap()
    }
}

/// Initializing a global connection pool and retrieve a connection.
pub struct SQLite {}
impl SQLite {
    /// Initialize a global SQLite connection pool by provided `url`
    /// # Example
    /// ```no_run
    /// use haro::db;
    ///
    /// db::SQLite::init("test.db")
    /// ```
    pub fn init(url: &str) {
        let manager = SqliteConnectionManager::file(url);
        let pool = r2d2::Pool::new(manager).unwrap();
        GLOBAL_SQLITE_POOL.set(pool).unwrap();
    }

    /// Retrieve a connection from the global SQLite connection pool
    /// # Example
    /// ```no_run
    /// use haro::db;
    ///
    /// let client = db::SQLite::get();
    /// ```
    pub fn get() -> PooledConnection<SqliteConnectionManager> {
        let pool = GLOBAL_SQLITE_POOL.get().unwrap().clone();
        pool.get().unwrap()
    }
}