59 lines
1.8 KiB
Rust
59 lines
1.8 KiB
Rust
use std::ops::Deref;
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use diesel::r2d2;
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use diesel::r2d2::ConnectionManager;
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use diesel::sqlite::SqliteConnection;
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use diesel::{Connection as DieselConnection, ConnectionError};
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use rocket::http::Status;
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use rocket::request::{self, FromRequest};
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use rocket::{Outcome, Request, State};
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use crate::CONFIG;
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/// An alias to the database connection used
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type Connection = SqliteConnection;
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/// An alias to the type for a pool of Diesel SQLite connections.
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type Pool = r2d2::Pool<ConnectionManager<Connection>>;
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/// Connection request guard type: a wrapper around an r2d2 pooled connection.
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pub struct DbConn(pub r2d2::PooledConnection<ConnectionManager<Connection>>);
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pub mod models;
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pub mod schema;
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/// Initializes a database pool.
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pub fn init_pool() -> Pool {
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let manager = ConnectionManager::new(&*CONFIG.database_url);
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r2d2::Pool::builder().build(manager).expect("Failed to create pool")
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}
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pub fn get_connection() -> Result<Connection, ConnectionError> {
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Connection::establish(&CONFIG.database_url)
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}
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/// Attempts to retrieve a single connection from the managed database pool. If
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/// no pool is currently managed, fails with an `InternalServerError` status. If
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/// no connections are available, fails with a `ServiceUnavailable` status.
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impl<'a, 'r> FromRequest<'a, 'r> for DbConn {
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type Error = ();
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fn from_request(request: &'a Request<'r>) -> request::Outcome<DbConn, ()> {
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let pool = request.guard::<State<Pool>>()?;
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match pool.get() {
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Ok(conn) => Outcome::Success(DbConn(conn)),
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Err(_) => Outcome::Failure((Status::ServiceUnavailable, ())),
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}
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}
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}
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// For the convenience of using an &DbConn as a &Database.
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impl Deref for DbConn {
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type Target = Connection;
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fn deref(&self) -> &Self::Target {
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&self.0
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}
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}
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