264 lines
12 KiB
Python
264 lines
12 KiB
Python
# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain 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,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Symbols intended to be imported by both placement code and placement API
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consumers. When placement is separated out, this module should be part of a
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common library that both placement and its consumers can require."""
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import re
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import webob
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from placement import microversion
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from placement import util
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# Querystring-related constants
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_QS_RESOURCES = 'resources'
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_QS_REQUIRED = 'required'
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_QS_MEMBER_OF = 'member_of'
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_QS_IN_TREE = 'in_tree'
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_QS_KEY_PATTERN = re.compile(
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r"^(%s)([1-9][0-9]*)?$" % '|'.join(
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(_QS_RESOURCES, _QS_REQUIRED, _QS_MEMBER_OF, _QS_IN_TREE)))
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class RequestGroup(object):
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def __init__(self, use_same_provider=True, resources=None,
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required_traits=None, forbidden_traits=None, member_of=None,
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in_tree=None, forbidden_aggs=None):
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"""Create a grouping of resource and trait requests.
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:param use_same_provider:
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If True, (the default) this RequestGroup represents requests for
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resources and traits which must be satisfied by a single resource
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provider. If False, represents a request for resources and traits
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in any resource provider in the same tree, or a sharing provider.
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:param resources: A dict of { resource_class: amount, ... }
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:param required_traits: A set of { trait_name, ... }
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:param forbidden_traits: A set of { trait_name, ... }
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:param member_of: A list of [ [aggregate_UUID],
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[aggregate_UUID, aggregate_UUID] ... ]
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:param in_tree: A UUID of a root or a non-root provider from whose
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tree this RequestGroup must be satisfied.
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"""
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self.use_same_provider = use_same_provider
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self.resources = resources or {}
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self.required_traits = required_traits or set()
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self.forbidden_traits = forbidden_traits or set()
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self.member_of = member_of or []
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self.in_tree = in_tree
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self.forbidden_aggs = forbidden_aggs or set()
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def __str__(self):
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ret = 'RequestGroup(use_same_provider=%s' % str(self.use_same_provider)
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ret += ', resources={%s}' % ', '.join(
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'%s:%d' % (rc, amount)
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for rc, amount in sorted(list(self.resources.items())))
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ret += ', traits=[%s]' % ', '.join(
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sorted(self.required_traits) +
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['!%s' % ft for ft in self.forbidden_traits])
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ret += ', aggregates=[%s]' % ', '.join(
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sorted('[%s]' % ', '.join(agglist)
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for agglist in sorted(self.member_of)))
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ret += ')'
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return ret
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@staticmethod
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def _parse_request_items(req, allow_forbidden):
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ret = {}
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for key, val in req.GET.items():
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match = _QS_KEY_PATTERN.match(key)
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if not match:
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continue
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# `prefix` is 'resources', 'required', 'member_of', or 'in_tree'
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# `suffix` is an integer string, or None
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prefix, suffix = match.groups()
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suffix = suffix or ''
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if suffix not in ret:
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ret[suffix] = RequestGroup(use_same_provider=bool(suffix))
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request_group = ret[suffix]
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if prefix == _QS_RESOURCES:
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request_group.resources = util.normalize_resources_qs_param(
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val)
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elif prefix == _QS_REQUIRED:
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request_group.required_traits = util.normalize_traits_qs_param(
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val, allow_forbidden=allow_forbidden)
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elif prefix == _QS_MEMBER_OF:
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# special handling of member_of qparam since we allow multiple
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# member_of params at microversion 1.24.
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# NOTE(jaypipes): Yes, this is inefficient to do this when
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# there are multiple member_of query parameters, but we do this
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# so we can error out if someone passes an "orphaned" member_of
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# request group.
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# TODO(jaypipes): Do validation of query parameters using
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# JSONSchema
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request_group.member_of, request_group.forbidden_aggs = (
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util.normalize_member_of_qs_params(req, suffix))
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elif prefix == _QS_IN_TREE:
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request_group.in_tree = util.normalize_in_tree_qs_params(
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val)
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return ret
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@staticmethod
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def _check_for_orphans(by_suffix):
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# Ensure any group with 'required' or 'member_of' also has 'resources'.
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orphans = [('required%s' % suff) for suff, group in by_suffix.items()
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if group.required_traits and not group.resources]
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if orphans:
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msg = (
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'All traits parameters must be associated with resources. '
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'Found the following orphaned traits keys: %s')
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raise webob.exc.HTTPBadRequest(msg % ', '.join(orphans))
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orphans = [('member_of%s' % suff) for suff, group in by_suffix.items()
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if not group.resources and (
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group.member_of or group.forbidden_aggs)]
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if orphans:
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msg = ('All member_of parameters must be associated with '
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'resources. Found the following orphaned member_of '
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'keys: %s')
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raise webob.exc.HTTPBadRequest(msg % ', '.join(orphans))
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# All request groups must have resources (which is almost, but not
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# quite, verified by the orphan checks above).
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if not all(grp.resources for grp in by_suffix.values()):
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msg = "All request groups must specify resources."
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raise webob.exc.HTTPBadRequest(msg)
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# The above would still pass if there were no request groups
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if not by_suffix:
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msg = (
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"At least one request group (`resources` or `resources{N}`) "
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"is required.")
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raise webob.exc.HTTPBadRequest(msg)
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@staticmethod
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def _fix_forbidden(by_suffix):
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conflicting_traits = []
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for suff, group in by_suffix.items():
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forbidden = [trait for trait in group.required_traits
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if trait.startswith('!')]
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group.required_traits = group.required_traits - set(forbidden)
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group.forbidden_traits = set([trait.lstrip('!') for trait in
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forbidden])
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conflicts = group.forbidden_traits & group.required_traits
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if conflicts:
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conflicting_traits.append('required%s: (%s)'
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% (suff, ', '.join(conflicts)))
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if conflicting_traits:
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msg = (
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'Conflicting required and forbidden traits found in the '
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'following traits keys: %s')
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raise webob.exc.HTTPBadRequest(
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msg % ', '.join(conflicting_traits))
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@classmethod
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def dict_from_request(cls, req):
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"""Parse numbered resources, traits, and member_of groupings out of a
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querystring dict found in a webob Request.
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The input req contains a query string of the form:
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?resources=$RESOURCE_CLASS_NAME:$AMOUNT,$RESOURCE_CLASS_NAME:$AMOUNT
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&required=$TRAIT_NAME,$TRAIT_NAME&member_of=in:$AGG1_UUID,$AGG2_UUID
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&in_tree=$RP_UUID
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&resources1=$RESOURCE_CLASS_NAME:$AMOUNT,RESOURCE_CLASS_NAME:$AMOUNT
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&required1=$TRAIT_NAME,$TRAIT_NAME&member_of1=$AGG_UUID
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&resources2=$RESOURCE_CLASS_NAME:$AMOUNT,RESOURCE_CLASS_NAME:$AMOUNT
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&required2=$TRAIT_NAME,$TRAIT_NAME&member_of2=$AGG_UUID
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These are parsed in groups according to the numeric suffix of the key.
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For each group, a RequestGroup instance is created containing that
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group's resources, required traits, and member_of. For the (single)
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group with no suffix, the RequestGroup.use_same_provider attribute is
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False; for the numbered groups it is True.
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If a trait in the required parameter is prefixed with ``!`` this
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indicates that that trait must not be present on the resource
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providers in the group. That is, the trait is forbidden. Forbidden
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traits are only processed if ``allow_forbidden`` is True. This allows
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the caller to control processing based on microversion handling.
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The return is a dict, keyed by the numeric suffix of these RequestGroup
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instances (or the empty string for the unnumbered group).
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As an example, if qsdict represents the query string:
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?resources=VCPU:2,MEMORY_MB:1024,DISK_GB=50
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&required=HW_CPU_X86_VMX,CUSTOM_STORAGE_RAID
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&member_of=9323b2b1-82c9-4e91-bdff-e95e808ef954
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&member_of=in:8592a199-7d73-4465-8df6-ab00a6243c82,ddbd9226-d6a6-475e-a85f-0609914dd058 # noqa
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&in_tree=b9fc9abb-afc2-44d7-9722-19afc977446a
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&resources1=SRIOV_NET_VF:2
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&required1=CUSTOM_PHYSNET_PUBLIC,CUSTOM_SWITCH_A
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&resources2=SRIOV_NET_VF:1
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&required2=!CUSTOM_PHYSNET_PUBLIC
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...the return value will be:
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{ '': RequestGroup(
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use_same_provider=False,
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resources={
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"VCPU": 2,
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"MEMORY_MB": 1024,
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"DISK_GB" 50,
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},
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required_traits=[
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"HW_CPU_X86_VMX",
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"CUSTOM_STORAGE_RAID",
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],
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member_of=[
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[9323b2b1-82c9-4e91-bdff-e95e808ef954],
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[8592a199-7d73-4465-8df6-ab00a6243c82,
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ddbd9226-d6a6-475e-a85f-0609914dd058],
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],
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in_tree=b9fc9abb-afc2-44d7-9722-19afc977446a,
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),
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'1': RequestGroup(
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use_same_provider=True,
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resources={
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"SRIOV_NET_VF": 2,
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},
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required_traits=[
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"CUSTOM_PHYSNET_PUBLIC",
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"CUSTOM_SWITCH_A",
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],
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),
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'2': RequestGroup(
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use_same_provider=True,
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resources={
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"SRIOV_NET_VF": 1,
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},
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forbidden_traits=[
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"CUSTOM_PHYSNET_PUBLIC",
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],
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),
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}
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:param req: webob.Request object
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:return: A dict, keyed by suffix, of RequestGroup instances.
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:raises `webob.exc.HTTPBadRequest` if any value is malformed, or if a
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trait list is given without corresponding resources.
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"""
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want_version = req.environ[microversion.MICROVERSION_ENVIRON]
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# Control whether we handle forbidden traits.
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allow_forbidden = want_version.matches((1, 22))
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# dict of the form: { suffix: RequestGroup } to be returned
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by_suffix = cls._parse_request_items(req, allow_forbidden)
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cls._check_for_orphans(by_suffix)
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# Make adjustments for forbidden traits by stripping forbidden out
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# of required.
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if allow_forbidden:
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cls._fix_forbidden(by_suffix)
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return by_suffix
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