println('matrix.leave $code $params')

	if idx := self.find_idx_by_id(room_id) {
		self.rooms.delete(idx)
		println('rooms.delete() $room_id')
	} else {
		println('rooms.delete() $room_id $err')
	}
}
pub fn (mut self Rooms) find_idx_by_id(room_id string) ?int {
	for idx, room in self.rooms {
		if room.id == room_id {
			return idx
		}
	}
	return error('not found')