73 lines
2.7 KiB
Python
73 lines
2.7 KiB
Python
# Copyright (c) 2017 NTT.
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#
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# 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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from oslo_serialization import jsonutils
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import six
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from blazar.manager import exceptions as manager_ex
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def convert_requirements(requirements):
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"""Convert the requirements to an array of strings
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Convert the requirements to an array of strings.
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["key op value", "key op value", ...]
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"""
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# TODO(frossigneux) Support the "or" operator
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# Convert text to json
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if isinstance(requirements, six.string_types):
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try:
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requirements = jsonutils.loads(requirements)
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except ValueError:
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raise manager_ex.MalformedRequirements(rqrms=requirements)
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# Requirement list looks like ['<', '$ram', '1024']
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if _requirements_with_three_elements(requirements):
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result = []
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if requirements[0] == '=':
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requirements[0] = '=='
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string = (requirements[1][1:] + " " + requirements[0] + " " +
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requirements[2])
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result.append(string)
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return result
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# Remove the 'and' element at the head of the requirement list
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elif _requirements_with_and_keyword(requirements):
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return [convert_requirements(x)[0] for x in requirements[1:]]
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# Empty requirement list0
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elif isinstance(requirements, list) and not requirements:
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return requirements
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else:
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raise manager_ex.MalformedRequirements(rqrms=requirements)
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def _requirements_with_three_elements(requirements):
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"""Return true if requirement list looks like ['<', '$ram', '1024']."""
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return (isinstance(requirements, list) and
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len(requirements) == 3 and
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isinstance(requirements[0], six.string_types) and
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isinstance(requirements[1], six.string_types) and
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isinstance(requirements[2], six.string_types) and
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requirements[0] in ['==', '=', '!=', '>=', '<=', '>', '<'] and
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len(requirements[1]) > 1 and requirements[1][0] == '$' and
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len(requirements[2]) > 0)
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def _requirements_with_and_keyword(requirements):
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return (len(requirements) > 1 and
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isinstance(requirements[0], six.string_types) and
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requirements[0] == 'and' and
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all(convert_requirements(x) for x in requirements[1:]))
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