332 lines
13 KiB
Python
332 lines
13 KiB
Python
# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import os
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import re
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from oslo_config import cfg
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from oslo_log import log as logging
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from six.moves import urllib
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import webob
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from karbor.i18n import _
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api_common_opts = [
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cfg.IntOpt('osapi_max_limit',
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default=1000,
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help='The maximum number of items that a collection '
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'resource returns in a single response'),
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cfg.StrOpt('osapi_plan_base_URL',
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help='Base URL that will be presented to users in links '
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'to the OpenStack Plan API',
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deprecated_name='osapi_compute_link_prefix'),
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]
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CONF = cfg.CONF
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CONF.register_opts(api_common_opts)
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LOG = logging.getLogger(__name__)
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def get_pagination_params(params, max_limit=None):
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"""Return marker, limit, offset tuple from request.
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:param params: `wsgi.Request`'s GET dictionary, possibly containing
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'marker', 'limit', and 'offset' variables. 'marker' is the
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id of the last element the client has seen, 'limit' is the
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maximum number of items to return and 'offset' is the number
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of items to skip from the marker or from the first element.
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If 'limit' is not specified, or > max_limit, we default to
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max_limit. Negative values for either offset or limit will
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cause exc.HTTPBadRequest() exceptions to be raised. If no
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offset is present we'll default to 0 and if no marker is
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present we'll default to None.
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:max_limit: Max value 'limit' return value can take
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:returns: Tuple (marker, limit, offset)
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"""
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max_limit = max_limit or CONF.osapi_max_limit
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limit = _get_limit_param(params, max_limit)
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marker = _get_marker_param(params)
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offset = _get_offset_param(params)
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return marker, limit, offset
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def _get_limit_param(params, max_limit=None):
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"""Extract integer limit from request's dictionary or fail.
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Defaults to max_limit if not present and returns max_limit if present
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'limit' is greater than max_limit.
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"""
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max_limit = max_limit or CONF.osapi_max_limit
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try:
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limit = int(params.pop('limit', max_limit))
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except ValueError:
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msg = _('limit param must be an integer')
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raise webob.exc.HTTPBadRequest(explanation=msg)
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if limit <= 0:
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msg = _('limit param must be positive')
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raise webob.exc.HTTPBadRequest(explanation=msg)
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limit = min(limit, max_limit)
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return limit
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def _get_marker_param(params):
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"""Extract marker id from request's dictionary (defaults to None)."""
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return params.pop('marker', None)
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def _get_offset_param(params):
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"""Extract offset id from request's dictionary (defaults to 0) or fail."""
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try:
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offset = int(params.pop('offset', 0))
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except ValueError:
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msg = _('offset param must be an integer')
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raise webob.exc.HTTPBadRequest(explanation=msg)
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if offset < 0:
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msg = _('offset param must be positive')
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raise webob.exc.HTTPBadRequest(explanation=msg)
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return offset
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def limited(items, request, max_limit=None):
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"""Return a slice of items according to requested offset and limit.
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:param items: A sliceable entity
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:param request: ``wsgi.Request`` possibly containing 'offset' and 'limit'
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GET variables. 'offset' is where to start in the list,
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and 'limit' is the maximum number of items to return. If
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'limit' is not specified, 0, or > max_limit, we default
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to max_limit. Negative values for either offset or limit
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will cause exc.HTTPBadRequest() exceptions to be raised.
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:kwarg max_limit: The maximum number of items to return from 'items'
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"""
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max_limit = max_limit or CONF.osapi_max_limit
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marker, limit, offset = get_pagination_params(request.GET.copy(),
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max_limit)
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range_end = offset + (limit or max_limit)
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return items[offset:range_end]
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def limited_by_marker(items, request, max_limit=None):
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"""Return a slice of items according to the requested marker and limit."""
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max_limit = max_limit or CONF.osapi_max_limit
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marker, limit, __ = get_pagination_params(request.GET.copy(), max_limit)
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start_index = 0
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if marker:
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start_index = -1
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for i, item in enumerate(items):
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if 'flavorid' in item:
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if item['flavorid'] == marker:
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start_index = i + 1
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break
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elif item['id'] == marker or item.get('uuid') == marker:
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start_index = i + 1
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break
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if start_index < 0:
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msg = _('marker [%s] not found') % marker
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raise webob.exc.HTTPBadRequest(explanation=msg)
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range_end = start_index + limit
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return items[start_index:range_end]
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def get_sort_params(params, default_key='created_at', default_dir='desc'):
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"""Retrieves sort keys/directions parameters.
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Processes the parameters to create a list of sort keys and sort directions
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that correspond to either the 'sort' parameter or the 'sort_key' and
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'sort_dir' parameter values. The value of the 'sort' parameter is a comma-
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separated list of sort keys, each key is optionally appended with
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':<sort_direction>'.
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Note that the 'sort_key' and 'sort_dir' parameters are deprecated in kilo
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and an exception is raised if they are supplied with the 'sort' parameter.
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The sort parameters are removed from the request parameters by this
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function.
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:param params: webob.multidict of request parameters (from
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karbor.api.openstack.wsgi.Request.params)
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:param default_key: default sort key value, added to the list if no
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sort keys are supplied
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:param default_dir: default sort dir value, added to the list if the
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corresponding key does not have a direction
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specified
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:returns: list of sort keys, list of sort dirs
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:raise webob.exc.HTTPBadRequest: If both 'sort' and either 'sort_key' or
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'sort_dir' are supplied parameters
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"""
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if 'sort' in params and ('sort_key' in params or 'sort_dir' in params):
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msg = _("The 'sort_key' and 'sort_dir' parameters are deprecated and "
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"cannot be used with the 'sort' parameter.")
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raise webob.exc.HTTPBadRequest(explanation=msg)
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sort_keys = []
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sort_dirs = []
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if 'sort' in params:
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for sort in params.pop('sort').strip().split(','):
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sort_key, _sep, sort_dir = sort.partition(':')
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if not sort_dir:
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sort_dir = default_dir
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sort_keys.append(sort_key.strip())
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sort_dirs.append(sort_dir.strip())
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else:
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sort_key = params.pop('sort_key', default_key)
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sort_dir = params.pop('sort_dir', default_dir)
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sort_keys.append(sort_key.strip())
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sort_dirs.append(sort_dir.strip())
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return sort_keys, sort_dirs
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def get_request_url(request):
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url = request.application_url
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headers = request.headers
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forwarded = headers.get('X-Forwarded-Host')
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if forwarded:
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url_parts = list(urllib.parse.urlsplit(url))
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url_parts[1] = re.split(',\s?', forwarded)[-1]
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url = urllib.parse.urlunsplit(url_parts).rstrip('/')
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return url
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def remove_version_from_href(href):
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"""Removes the first api version from the href.
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Given: 'http://www.karbor.com/v1.1/123'
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Returns: 'http://www.karbor.com/123'
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Given: 'http://www.karbor.com/v1.1'
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Returns: 'http://www.karbor.com'
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"""
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parsed_url = urllib.parse.urlsplit(href)
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url_parts = parsed_url.path.split('/', 2)
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# NOTE: this should match vX.X or vX
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expression = re.compile(r'^v([0-9]+|[0-9]+\.[0-9]+)(/.*|$)')
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if expression.match(url_parts[1]):
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del url_parts[1]
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new_path = '/'.join(url_parts)
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if new_path == parsed_url.path:
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msg = 'href %s does not contain version' % href
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LOG.debug(msg)
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raise ValueError(msg)
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parsed_url = list(parsed_url)
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parsed_url[2] = new_path
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return urllib.parse.urlunsplit(parsed_url)
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class ViewBuilder(object):
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"""Model API responses as dictionaries."""
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_collection_name = None
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def _get_links(self, request, identifier):
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return [{"rel": "self",
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"href": self._get_href_link(request, identifier), },
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{"rel": "bookmark",
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"href": self._get_bookmark_link(request, identifier), }]
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def _get_next_link(self, request, identifier, collection_name):
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"""Return href string with proper limit and marker params."""
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params = request.params.copy()
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params["marker"] = identifier
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prefix = self._update_link_prefix(get_request_url(request),
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CONF.osapi_plan_base_URL)
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url = os.path.join(prefix,
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request.environ["karbor.context"].project_id,
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collection_name)
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return "%s?%s" % (url, urllib.parse.urlencode(params))
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def _get_href_link(self, request, identifier):
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"""Return an href string pointing to this object."""
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prefix = self._update_link_prefix(get_request_url(request),
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CONF.osapi_plan_base_URL)
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return os.path.join(prefix,
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request.environ["karbor.context"].project_id,
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self._collection_name,
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str(identifier))
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def _get_bookmark_link(self, request, identifier):
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"""Create a URL that refers to a specific resource."""
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base_url = remove_version_from_href(get_request_url(request))
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base_url = self._update_link_prefix(base_url,
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CONF.osapi_plan_base_URL)
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return os.path.join(base_url,
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request.environ["karbor.context"].project_id,
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self._collection_name,
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str(identifier))
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def _get_collection_links(self, request, items, collection_name,
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item_count=None, id_key="uuid"):
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"""Retrieve 'next' link, if applicable.
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The next link is included if we are returning as many items as we can,
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given the restrictions of limit optional request parameter and
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osapi_max_limit configuration parameter as long as we are returning
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some elements.
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So we return next link if:
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1) 'limit' param is specified and equal to the number of items.
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2) 'limit' param is NOT specified and the number of items is
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equal to CONF.osapi_max_limit.
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:param request: API request
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:param items: List of collection items
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:param collection_name: Name of collection, used to generate the
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next link for a pagination query
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:param item_count: Length of the list of the original collection
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items
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:param id_key: Attribute key used to retrieve the unique ID, used
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to generate the next link marker for a pagination query
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:returns: links
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"""
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item_count = item_count or len(items)
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limit = _get_limit_param(request.GET.copy())
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if len(items) and limit <= item_count:
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return self._generate_next_link(items, id_key, request,
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collection_name)
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return []
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def _generate_next_link(self, items, id_key, request,
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collection_name):
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links = []
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last_item = items[-1]
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if id_key in last_item:
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last_item_id = last_item[id_key]
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else:
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last_item_id = last_item["id"]
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links.append({
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"rel": "next",
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"href": self._get_next_link(request, last_item_id,
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collection_name),
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})
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return links
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def _update_link_prefix(self, orig_url, prefix):
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if not prefix:
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return orig_url
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url_parts = list(urllib.parse.urlsplit(orig_url))
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prefix_parts = list(urllib.parse.urlsplit(prefix))
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url_parts[0:2] = prefix_parts[0:2]
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url_parts[2] = prefix_parts[2] + url_parts[2]
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return urllib.parse.urlunsplit(url_parts).rstrip('/')
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