Can't use Lobby to pair

[vishalkrishnads]

Since Lobby can't contain a db field, it is impossible to pair a vehicle to it's user through it. The application requirements state that a user & vehicle should be able to use a single websocket connection to execute the pair. This is necessary to implement QR code pairing at the client side.

• The default() method doesn't support args

  impl Default for Lobby {
      // default() can't take args
      fn default(db: Database) -> Lobby {
          Lobby {
              db_instance: db,
              sessions: Hashmap::new(),
              rooms: Hashmap::new()
          }
      }
  }

• There is no way to make the default() method async in Lobby, or anywhere basically.

  impl Default for Lobby {
      // this throws an error
      async fn default() -> Lobby {
          // async code to spin up a new connection to db
          Lobby {
            db_instnace: <db_object>,
            sessions: Hashmap::new(),
            rooms: Hashmap::new()
          }
      }
  }

[vishalkrishnads]

I also tried using actix_web::rt::spawn() to move the database operations directly into Handler<Connect> for Lobby, but can't access the self of Lobby inside the spawned closure.

actix_web::rt::spawn(async {
    // make db updates here
    self.send_disconnect(&*message, &msg.self_id, CloseCode::Normal);
});

This method would've worked as we could check everything before initiating the pair.

[vishalkrishnads]

We've concluded that it's better to leave this as is until UI is complete. If this hinders the UX, then we'll deal with it then.