def _fetch_images(self, fetch_func, **kwargs):
"""Paginate through results from glance server"""
images = fetch_func(**kwargs)
if not images:
# break out of recursive loop to end pagination
return
for image in images:
yield image
try:
# attempt to advance the marker in order to fetch next page
kwargs['marker'] = images[-1]['id']
except KeyError:
raise exception.ImagePaginationFailed()
try:
kwargs['limit'] = kwargs['limit'] - len(images)
# break if we have reached a provided limit
if kwargs['limit'] <= 0:
return
except KeyError:
# ignore missing limit, just proceed without it
pass
for image in self._fetch_images(fetch_func, **kwargs):
yield image
def _fetch_images(self, fetch_func, **kwargs):
"""Paginate through results from glance server"""
images = fetch_func(**kwargs)
for image in images:
yield image
else:
# break out of recursive loop to end pagination
return
try:
# attempt to advance the marker in order to fetch next page
kwargs['marker'] = images[-1]['id']
except KeyError:
raise exception.ImagePaginationFailed()
self._fetch_images(fetch_func, **kwargs)
