import logging.config

from prometheus_client import Gauge

from app import app, prometheus
from data.database import UseThenDisconnect
from workers.securityworker.models_pre_oci import pre_oci_model as model
from util.secscan.api import APIRequestFailure
from util.secscan.analyzer import PreemptedException


logger = logging.getLogger(__name__)


unscanned_images = Gauge('quay_security_scanning_unscanned_images_remaining',
                         'number of images that are not scanned by the latest security scanner')


def index_images(target_version, analyzer, token=None):
  """ Performs security indexing of all images in the database not scanned at the target version.
      If a token is provided, scanning will begin where the token indicates it previously completed.
  """
  iterator, next_token = model.candidates_to_scan(target_version, start_token=token)
  if iterator is None:
    logger.debug('Found no additional images to scan')
    return None

  with UseThenDisconnect(app.config):
    for candidate, abt, num_remaining in iterator:
      try:
        analyzer.analyze_recursively(candidate)
      except PreemptedException:
        logger.info('Another worker pre-empted us for layer: %s', candidate.id)
        abt.set()
      except APIRequestFailure:
        logger.exception('Security scanner service unavailable')
        return

      unscanned_images.set(num_remaining)

  return next_token