From 1ad0faf980ac89e904a246f1dfeddf51a21fd740 Mon Sep 17 00:00:00 2001 From: Naveed Massjouni Date: Thu, 24 Mar 2011 13:48:04 -0400 Subject: Paginated results should not include the item starting at marker. Improved implementation of common.limited_by_marker as suggested by Matt Dietz. Added flag osapi_max_limit. --- nova/api/openstack/common.py | 28 ++++++++++++++++------------ 1 file changed, 16 insertions(+), 12 deletions(-) (limited to 'nova/api') diff --git a/nova/api/openstack/common.py b/nova/api/openstack/common.py index f85d1df9d..f598ac824 100644 --- a/nova/api/openstack/common.py +++ b/nova/api/openstack/common.py @@ -20,9 +20,11 @@ from urlparse import urlparse import webob from nova import exception +from nova import flags +FLAGS = flags.FLAGS -def limited(items, request, max_limit=1000): +def limited(items, request, max_limit=FLAGS.osapi_max_limit): """ Return a slice of items according to requested offset and limit. @@ -56,10 +58,13 @@ def limited(items, request, max_limit=1000): return items[offset:range_end] -def limited_by_marker(items, request, max_limit=1000): - ''' Return a slice of items according to requested marker and limit. ''' +def limited_by_marker(items, request, max_limit=FLAGS.osapi_max_limit): + """Return a slice of items according to the requested marker and limit.""" - marker = request.GET.get('marker') + try: + marker = int(request.GET.get('marker', 0)) + except ValueError: + raise webob.exc.HTTPBadRequest(_('marker param must be an integer')) try: limit = int(request.GET.get('limit', max_limit)) @@ -69,17 +74,16 @@ def limited_by_marker(items, request, max_limit=1000): if limit < 0: raise webob.exc.HTTPBadRequest(_('limit param must be positive')) - limit = min(max_limit, limit or max_limit) + limit = min(max_limit, limit) start_index = 0 - if marker != None: - found_it = False + if marker: + start_index = -1 for i, item in enumerate(items): - if str(item['id']) == marker: - start_index = i - found_it = True + if item['id'] == marker: + start_index = i + 1 break - if not found_it: - raise webob.exc.HTTPBadRequest(_('marker not found')) + if start_index < 0: + raise webob.exc.HTTPBadRequest(_('marker [%s] not found' % marker)) range_end = start_index + limit return items[start_index:range_end] -- cgit