refacto(react-rust-postgres): replace rocket by actix-web (#153)

Signed-off-by: Jérémie Drouet <jeremie.drouet@gmail.com>

react-rust-postgres/backend/src/postgres.rs

@@ -0,0 +1,40 @@
+use deadpool_postgres::{Config, Pool};
+use tokio_postgres::NoTls;
+use tokio_postgres_migration::Migration;
+
+const SCRIPTS_UP: [(&str, &str); 1] = [(
+    "0001_create-users",
+    include_str!("../migrations/0001_create-users_up.sql"),
+)];
+
+fn create_config() -> Config {
+    let mut cfg = Config::new();
+    if let Ok(host) = std::env::var("PG_HOST") {
+        cfg.host = Some(host);
+    }
+    if let Ok(dbname) = std::env::var("PG_DBNAME") {
+        cfg.dbname = Some(dbname);
+    }
+    if let Ok(user) = std::env::var("PG_USER") {
+        cfg.user = Some(user);
+    }
+    if let Ok(password) = std::env::var("PG_PASSWORD") {
+        cfg.password = Some(password);
+    }
+    cfg
+}
+
+pub fn create_pool() -> Pool {
+    create_config()
+        .create_pool(NoTls)
+        .expect("couldn't create postgres pool")
+}
+
+pub async fn migrate_up(pool: &Pool) {
+    let mut client = pool.get().await.expect("couldn't get postgres client");
+    let migration = Migration::new("migrations".to_string());
+    migration
+        .up(&mut **client, &SCRIPTS_UP)
+        .await
+        .expect("couldn't run migrations");
+}