models.py 文件源码

def mark_todelete(cls, drive_id):
        """Marks PD for deletion. Also creates a new one PD with the same
        'name' and owner, but with different physical 'drive_name'. It is
        needed for possibility to fast relaunch the pod right after PD
        deletion. If we will use the same physical drive name, then we have
        to wait until old drive will be actually deleted.
        """
        pd = cls.query.filter(cls.id == drive_id, cls.pod_id.is_(None)).first()
        if not pd or pd.state == PersistentDiskStatuses.TODELETE:
            return
        new_drive_name = cls._increment_drive_name(pd)
        old_name = pd.name
        # change name for deleting PD to prevent conflict of uniques and
        # to hide PD from search by name
        pd.name = uuid.uuid4().hex
        pd.state = PersistentDiskStatuses.TODELETE
        db.session.flush()
        new_pd = cls(
            drive_name=new_drive_name, name=old_name, owner_id=pd.owner_id,
            size=pd.size, state=PersistentDiskStatuses.DELETED
        )
        db.session.add(new_pd)
        db.session.commit()
        return new_pd