Lib.rs

Simple static diesel r2d2 connection pooling.

ENV Configuration

• DATABASE_URL sets connection url

• MAX_DB_CONNECTIONS sets max connections within connection pool

The dotenv feature flag enables dotenv loading during pre-main static initialization via dotenvy.

lib.rs:

Static diesel r2d2 connection pooling with env configuration

Composible connection urls are provided by environment variables using env-url using the DATABASE prefix:

 | ENV                     |                            |
 | -----------------------:|:--------------------------:|
 | DATABASE_URL            | set connection url         |
 | DATABASE_HOST           | set url host               |
 | DATABASE_PORT           | set url port               |
 | DATABASE_PATH           | set selected database      |
 | DATABASE_USERINFO       | set connnection userinfo   |

MAX_DB_CONNECTIONS env sets max connections within connection pool

The dotenv feature flag enables automatic at-most-once dotenv loading via dotenvy. This is necessary because pool statics are initialized pre-main via static_init.

use diesel_connection::{pg::get_connection, PoolError};

#[actix_rt::main]
async fn main() -> Result<(), PoolError> {
  let conn = get_connection()?;
}