diff options
Diffstat (limited to 'src/lib.rs')
| -rw-r--r-- | src/lib.rs | 33 |
1 files changed, 33 insertions, 0 deletions
@@ -5,6 +5,7 @@ extern crate diesel_codegen; extern crate dotenv; extern crate r2d2_diesel; extern crate r2d2; +extern crate rocket; use diesel::pg::PgConnection; use r2d2_diesel::ConnectionManager; @@ -25,3 +26,35 @@ pub fn init_db_pool() -> Pool { 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 + } +} |