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use diesel::pg::PgConnection;
use r2d2;
use r2d2_diesel::ConnectionManager;
use dotenv::dotenv;
use std::env;
// An alias to the type for a pool of Diesel PostgreSql connections.
type Pool = r2d2::Pool<ConnectionManager<PgConnection>>;
/// Initializes a database pool.
pub fn init_db_pool() -> Pool {
dotenv().ok();
let config = r2d2::Config::default();
let dburl = env::var("DATABASE_URL")
.expect("DATABASE_URL environment variable must be set");
let manager = ConnectionManager::<PgConnection>::new(dburl);
r2d2::Pool::new(config, manager).expect("db pool")
}
use std::ops::Deref;
use rocket::http::Status;
use rocket::request::{self, FromRequest};
use rocket::{Request, State, Outcome};
// Connection request guard type: a wrapper around an r2d2 pooled connection.
pub struct DbConn(pub r2d2::PooledConnection<ConnectionManager<PgConnection>>);
/// Attempts to retrieve a single connection from the managed database pool. If
/// no pool is currently managed, fails with an `InternalServerError` status. If
/// no connections are available, fails with a `ServiceUnavailable` status.
impl<'a, 'r> FromRequest<'a, 'r> for DbConn {
type Error = ();
fn from_request(request: &'a Request<'r>) -> request::Outcome<DbConn, ()> {
let pool = request.guard::<State<Pool>>()?;
match pool.get() {
Ok(conn) => Outcome::Success(DbConn(conn)),
Err(_) => Outcome::Failure((Status::ServiceUnavailable, ()))
}
}
}
// For the convenience of using an &DbConn as an &SqliteConnection.
impl Deref for DbConn {
type Target = PgConnection;
fn deref(&self) -> &Self::Target {
&self.0
}
}
macro_rules! implement_responder_for {
// Implement a responder for the given template type
//
// Seems I can't add the lifetime after the matcher,
// like this: `$template_type<'a>`
// So it will have to be passed in to the argument at
// the macro incovation instead.
($template_type:ty) => (
impl<'a> ::rocket::response::Responder<'a> for $template_type {
fn respond_to(self, _: &::rocket::Request) -> Result<::rocket::Response<'static>, ::rocket::http::Status> {
::rocket::Response::build()
.header(::rocket::http::ContentType::HTML)
.sized_body(::std::io::Cursor::new(format!("{}", &self)))
.ok()
}
}
)
}
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