bb8

A full-featured connection pool, designed for asynchronous connections (using
tokio). Originally based on r2d2.

Opening a new database connection every time one is needed is both inefficient
and can lead to resource exhaustion under high traffic conditions. A connection
pool maintains a set of open connections to a database, handing them out for
repeated use.

bb8 is agnostic to the connection type it is managing. Implementors of the
ManageConnection trait provide the database-specific logic to create and
check the health of connections.

A (possibly not exhaustive) list of adapters for different backends:

Example

Using an imaginary “foodb” database.

#[tokio::main]
async fn main() {
    let manager = bb8_foodb::FooConnectionManager::new("localhost:1234");
    let pool = bb8::Pool::builder()
        .max_size(15)
        .build(manager)
        .await
        .unwrap();
    for _ in 0..20 {
        let pool = pool.clone();
        tokio::spawn(async move {
            let conn = pool.get().await.unwrap();
            // use the connection
            // it will be returned to the pool when it falls out of scope.
        });
    }
}

License

Licensed under the MIT license (LICENSE).

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted
for inclusion in the work by you shall be licensed as above, without any
additional terms or conditions.