60 lines
1.7 KiB
Python
60 lines
1.7 KiB
Python
# Copyright (c) 2013 Mirantis Inc.
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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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import functools
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import six
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from blazar.api.v1 import utils as api_utils
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from blazar import exceptions
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def check_exists(get_function, object_id=None, **get_args):
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"""Check object exists.
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:param get_function: Method to call to get object.
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:type get_function: function
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:param object_id: ID of the object to get.
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:type object_id: str
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:param get_args: Other params to pass to the get_function method.
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:type get_args: dict
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"""
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def decorator(func):
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"""Decorate method to check object existing."""
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if object_id is not None:
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get_args['id'] = object_id
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@functools.wraps(func)
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def handler(*args, **kwargs):
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"""Decorator handler."""
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get_kwargs = {}
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for k, v in six.iteritems(get_args):
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get_kwargs[k] = kwargs[v]
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try:
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obj = get_function(**get_kwargs)
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except exceptions.NotFound:
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obj = None
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if obj is None:
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e = exceptions.NotFound(object=get_kwargs)
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return api_utils.not_found(e)
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return func(*args, **kwargs)
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return handler
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return decorator
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