36 lines
1.2 KiB
Rust
36 lines
1.2 KiB
Rust
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use std::ops::Deref;
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use rocket::http::Status;
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use rocket::request::{self, FromRequest};
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use rocket::{Request, State, Outcome};
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use diesel::pg::PgConnection;
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use diesel::r2d2::{ConnectionManager, Pool, PooledConnection};
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// From rocket documentation
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// Connection request guard type: a wrapper around an r2d2 pooled connection.
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pub struct DbConn(pub PooledConnection<ConnectionManager<PgConnection>>);
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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<Self, Self::Error> {
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let pool = request.guard::<State<Pool<ConnectionManager<PgConnection>>>>()?;
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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 an &PgConnection.
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impl Deref for DbConn {
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type Target = PgConnection;
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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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