This is an integration between the rustls TLS stack and the tokio-postgres asynchronous PostgreSQL client library.
let config = rustls::ClientConfig::new();
let tls = tokio_postgres_rustls::MakeRustlsConnect::new(config);
let connect_fut = tokio_postgres::connect("sslmode=require host=localhost user=postgres", tls);
// ...
tokio-postgres-rustls is distributed under the MIT license.