common.py 文件源码

def limited_by_marker(items, request, max_limit=CONF.osapi_max_limit):
    """Return a slice of items according to the requested marker and limit."""
    params = get_pagination_params(request)

    limit = params.get('limit', max_limit)
    marker = params.get('marker')

    limit = min(max_limit, limit)
    start_index = 0
    if marker:
        start_index = -1
        for i, item in enumerate(items):
            if 'flavorid' in item:
                if item['flavorid'] == marker:
                    start_index = i + 1
                    break
            elif item['id'] == marker or item.get('uuid') == marker:
                start_index = i + 1
                break
        if start_index < 0:
            msg = _('marker [%s] not found') % marker
            raise webob.exc.HTTPBadRequest(explanation=msg)
    range_end = start_index + limit
    return items[start_index:range_end]