db pooling settings

src/lib.rs

@@ -2,17 +2,31 @@ pub mod callers;
 pub mod config;
 pub mod models;
 
+mod keys {
+    pub const DBURL: &str = "DATABASE_URL";
+
+    pub mod error {
+        pub const ERROR: &str = "DATABASE_URL must be set in .env";
+    }
+}
+
+mod connection_settings {
+    pub const MAXCONN: u32 = 5;
+}
+
 pub mod db_pool {
 
     use sqlx::postgres::PgPoolOptions;
     use std::env;
 
+    use crate::{connection_settings, keys};
+
     pub async fn create_pool() -> Result<sqlx::PgPool, sqlx::Error> {
         dotenv::dotenv().ok();
-        let database_url = env::var("DATABASE_URL").expect("DATABASE_URL must be set in .env");
+        let database_url = env::var(keys::DBURL).expect(keys::error::ERROR);
 
         PgPoolOptions::new()
-            .max_connections(10)
+            .max_connections(connection_settings::MAXCONN)
             .connect(&database_url)
             .await
     }