106 lines
3.3 KiB
Python
106 lines
3.3 KiB
Python
# Copyright 2017 Catalyst IT Limited
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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 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 abc
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import six
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from stevedore import driver
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from qinling import exceptions as exc
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STORAGE_PROVIDER = None
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@six.add_metaclass(abc.ABCMeta)
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class PackageStorage(object):
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"""PackageStorage interface."""
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@abc.abstractmethod
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def store(self, project_id, function, data, **kwargs):
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"""Store the function package data.
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:param project_id: Project ID.
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:param function: Function ID.
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:param data: Package file content.
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:param kwargs: A dict may including
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- md5sum: The MD5 provided by the user.
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:return: MD5 value of the package.
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"""
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raise NotImplementedError
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@abc.abstractmethod
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def retrieve(self, project_id, function, md5sum, version=None):
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"""Get function package data.
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:param project_id: Project ID.
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:param function: Function ID.
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:param md5sum: The function MD5.
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:param version: Optional. The function version number.
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:return: File descriptor that needs to close outside.
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"""
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raise NotImplementedError
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@abc.abstractmethod
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def delete(self, project_id, function, md5sum):
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raise NotImplementedError
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@abc.abstractmethod
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def changed_since(self, project_id, function, l_md5, version):
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"""Check if the function package has changed.
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Check if the function package has changed between lastest and the
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specified version.
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:param project_id: Project ID.
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:param function: Function ID.
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:param l_md5: Latest function package md5sum.
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:param version: The version number compared with.
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:return: True if changed otherwise False.
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"""
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raise NotImplementedError
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@abc.abstractmethod
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def copy(self, project_id, function, l_md5, old_version):
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"""Copy function package for a new version.
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:param project_id: Project ID.
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:param function: Function ID.
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:param l_md5: Latest function package md5sum.
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:param old_version: The version number that should copy from.
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:return: None
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"""
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raise NotImplementedError
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def load_storage_provider(conf):
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global STORAGE_PROVIDER
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if not STORAGE_PROVIDER:
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try:
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mgr = driver.DriverManager(
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'qinling.storage.provider',
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conf.storage.provider,
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invoke_on_load=True,
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invoke_args=[conf]
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)
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STORAGE_PROVIDER = mgr.driver
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except Exception as e:
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raise exc.StorageProviderException(
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'Failed to load storage provider: %s. Error: %s' %
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(conf.storage.provider, str(e))
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)
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return STORAGE_PROVIDER
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