import logging
from datetime import datetime, timedelta

from prometheus_client import Counter

from app import app, instance_keys
from workers.servicekeyworker.models_pre_oci import pre_oci_model as model
from workers.worker import Worker


logger = logging.getLogger(__name__)


instance_key_renewal_self = Counter('quay_instance_key_renewal_self_total',
                                    'number of times a Quay instance renews its own key',
                                    labelnames=['success'])


class ServiceKeyWorker(Worker):
  def __init__(self):
    super(ServiceKeyWorker, self).__init__()
    self.add_operation(self._refresh_service_key,
                       app.config.get('INSTANCE_SERVICE_KEY_REFRESH', 60) * 60)

  def _refresh_service_key(self):
    """
    Refreshes the instance's active service key so it doesn't get garbage collected.
    """
    expiration_time = timedelta(minutes=instance_keys.service_key_expiration)
    new_expiration = datetime.utcnow() + expiration_time

    logger.debug('Starting automatic refresh of service key %s to new expiration %s',
                 instance_keys.local_key_id, new_expiration)
    try:
      model.set_key_expiration(instance_keys.local_key_id, new_expiration)
    except Exception as ex:
      logger.exception('Failure for automatic refresh of service key %s with new expiration %s',
                       instance_keys.local_key_id, new_expiration)
      instance_key_renewal_self.labels(False).inc()
      raise ex

    logger.debug('Finished automatic refresh of service key %s with new expiration %s',
                 instance_keys.local_key_id, new_expiration)
    instance_key_renewal_self.labels(True).inc()


if __name__ == "__main__":
  worker = ServiceKeyWorker()
  worker.start()