root / snf-pithos-backend / pithos / backends / base.py @ 3a5994a8
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# Copyright 2011-2012 GRNET S.A. All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or
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# without modification, are permitted provided that the following
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# conditions are met:
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#
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# 1. Redistributions of source code must retain the above
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# copyright notice, this list of conditions and the following
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# disclaimer.
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#
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# 2. Redistributions in binary form must reproduce the above
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# copyright notice, this list of conditions and the following
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# disclaimer in the documentation and/or other materials
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# provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
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# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
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# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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#
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# The views and conclusions contained in the software and
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# documentation are those of the authors and should not be
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# interpreted as representing official policies, either expressed
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# or implied, of GRNET S.A.
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# Default setting for new accounts.
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DEFAULT_ACCOUNT_QUOTA = 0 # No quota. |
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DEFAULT_CONTAINER_QUOTA = 0 # No quota. |
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DEFAULT_CONTAINER_VERSIONING = 'auto'
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class NotAllowedError(Exception): |
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pass
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class QuotaError(Exception): |
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pass
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class AccountExists(NameError): |
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pass
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class ContainerExists(NameError): |
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pass
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class AccountNotEmpty(IndexError): |
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pass
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class ContainerNotEmpty(IndexError): |
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pass
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class ItemNotExists(NameError): |
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pass
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class VersionNotExists(IndexError): |
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pass
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class InvalidHash(TypeError): |
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pass
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class BaseBackend(object): |
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"""Abstract backend class.
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This class serves as a reference for actual implementations.
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The purpose of the backend is to provide the necessary functions
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for handling data and metadata.
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It is responsible for the actual storage and retrieval of information.
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Note that the account level is always valid as it is checked
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from another subsystem.
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When not replacing metadata/groups/policy, keys with empty values
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should be deleted.
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The following variables should be available:
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'hash_algorithm': Suggested is 'sha256'
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'block_size': Suggested is 4MB
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'default_account_policy': A dictionary with default account policy
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settings
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'default_container_policy': A dictionary with default container policy
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settings
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"""
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def close(self): |
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"""Close the backend connection."""
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pass
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def list_accounts(self, user, marker=None, limit=10000): |
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"""Return a list of accounts the user can access.
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Keyword arguments:
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'marker': Start list from the next item after 'marker'
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'limit': Number of containers to return
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"""
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return []
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def get_account_meta(self, user, account, domain, until=None, |
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include_user_defined=True, external_quota=None): |
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"""Return a dictionary with the account metadata for the domain.
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The keys returned are all user-defined, except:
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'name': The account name
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'count': The number of containers (or 0)
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'bytes': The total data size (or 0)
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'modified': Last modification timestamp (overall)
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'until_timestamp': Last modification until the timestamp provided
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'external_quota': The quota computed from external quota holder
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mechanism
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Raises:
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NotAllowedError: Operation not permitted
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"""
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return {}
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def update_account_meta(self, user, account, domain, meta, replace=False): |
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"""Update the metadata associated with the account for the domain.
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Parameters:
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'domain': Metadata domain
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Keyword arguments:
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'meta': Dictionary with metadata to update
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'replace': Replace instead of update
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Raises:
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NotAllowedError: Operation not permitted
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"""
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return
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def get_account_groups(self, user, account): |
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"""Return a dictionary with the user groups defined for the account.
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Raises:
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NotAllowedError: Operation not permitted
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"""
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return {}
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def update_account_groups(self, user, account, groups, replace=False): |
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"""Update the groups associated with the account.
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Raises:
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NotAllowedError: Operation not permitted
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ValueError: Invalid data in groups
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"""
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return
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def get_account_policy(self, user, account): |
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"""Return a dictionary with the account policy.
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The keys returned are:
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'quota': The maximum bytes allowed (default is 0 - unlimited)
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'versioning': Can be 'auto', 'manual' or 'none' (default: 'manual')
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Raises:
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NotAllowedError: Operation not permitted
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"""
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return {}
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def update_account_policy(self, user, account, policy, replace=False): |
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"""Update the policy associated with the account.
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Raises:
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NotAllowedError: Operation not permitted
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ValueError: Invalid policy defined
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"""
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return
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def put_account(self, user, account, policy=None): |
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"""Create a new account with the given name.
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Raises:
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NotAllowedError: Operation not permitted
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ValueError: Invalid policy defined
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"""
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return
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def delete_account(self, user, account): |
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"""Delete the account with the given name.
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Raises:
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NotAllowedError: Operation not permitted
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AccountNotEmpty: Account is not empty
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"""
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return
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def list_containers(self, user, account, marker=None, limit=10000, |
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shared=False, until=None, public=False): |
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"""Return a list of container names existing under an account.
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Keyword arguments:
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'marker': Start list from the next item after 'marker'
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'limit': Number of containers to return
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'shared': Only list containers with permissions set
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'public': Only list containers containing public objects
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Raises:
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NotAllowedError: Operation not permitted
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"""
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return []
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def list_container_meta(self, user, account, container, domain, |
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until=None):
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"""Return a list of the container's object meta keys for a domain.
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Raises:
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NotAllowedError: Operation not permitted
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ItemNotExists: Container does not exist
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"""
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return []
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def get_container_meta(self, user, account, container, domain, until=None, |
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include_user_defined=True):
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"""Return a dictionary with the container metadata for the domain.
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The keys returned are all user-defined, except:
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'name': The container name
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'count': The number of objects
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'bytes': The total data size
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'modified': Last modification timestamp (overall)
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'until_timestamp': Last modification until the timestamp provided
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Raises:
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NotAllowedError: Operation not permitted
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ItemNotExists: Container does not exist
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"""
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return {}
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def update_container_meta(self, user, account, container, domain, meta, |
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replace=False):
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"""Update the metadata associated with the container for the domain.
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Parameters:
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'domain': Metadata domain
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Keyword arguments:
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'meta': Dictionary with metadata to update
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'replace': Replace instead of update
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Raises:
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NotAllowedError: Operation not permitted
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ItemNotExists: Container does not exist
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"""
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return
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def get_container_policy(self, user, account, container): |
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"""Return a dictionary with the container policy.
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The keys returned are:
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'quota': The maximum bytes allowed (default is 0 - unlimited)
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'versioning': Can be 'auto', 'manual' or 'none' (default: 'manual')
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Raises:
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NotAllowedError: Operation not permitted
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ItemNotExists: Container does not exist
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"""
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return {}
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def update_container_policy(self, user, account, container, policy, |
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replace=False):
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"""Update the policy associated with the container.
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Raises:
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NotAllowedError: Operation not permitted
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ItemNotExists: Container does not exist
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ValueError: Invalid policy defined
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"""
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return
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def put_container(self, user, account, container, policy=None): |
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"""Create a new container with the given name.
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Raises:
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NotAllowedError: Operation not permitted
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ContainerExists: Container already exists
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ValueError: Invalid policy defined
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"""
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return
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def delete_container(self, user, account, container, until=None, |
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delimiter=None):
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"""Delete/purge the container with the given name.
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Keyword arguments:
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'delimiter': If not None, deletes the container contents starting
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with the delimiter
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Raises:
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NotAllowedError: Operation not permitted
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ItemNotExists: Container does not exist
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ContainerNotEmpty: Container is not empty
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"""
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return
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def list_objects(self, user, account, container, prefix='', delimiter=None, |
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marker=None, limit=10000, virtual=True, domain=None, |
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keys=None, shared=False, until=None, size_range=None, |
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public=False):
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"""List (object name, object version_id) under a container.
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Keyword arguments:
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'prefix': List objects starting with 'prefix'
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'delimiter': Return unique names before 'delimiter' and
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after 'prefix'
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'marker': Start list from the next item after 'marker'
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'limit': Number of objects to return
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'virtual': If not set, the result will only include names starting
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with 'prefix' and ending without a 'delimiter' or with
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the first occurance of the 'delimiter' after 'prefix'.
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If set, the result will include all names after 'prefix'
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up to and including the 'delimiter' if it is found
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'domain': Metadata domain for keys
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'keys': Include objects that satisfy the key queries in the list.
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Use 'key', '!key' for existence queries, 'key op value' for
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value queries, where 'op' can be one of =, !=, <=, >=, <, >
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'shared': Only list objects with permissions set
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'size_range': Include objects with byte size in (from, to).
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Use None to specify unlimited
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'public': Only list public objects
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Raises:
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NotAllowedError: Operation not permitted
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ItemNotExists: Container does not exist
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"""
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return []
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def list_object_meta(self, user, account, container, prefix='', |
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delimiter=None, marker=None, limit=10000, |
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virtual=True, domain=None, keys=None, shared=False, |
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until=None, size_range=None, public=False): |
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"""Return a list of metadata dicts of objects under a container.
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Same parameters with list_objects. Returned dicts have no user-defined
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metadata and, if until is not None, a None 'modified' timestamp.
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Raises:
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NotAllowedError: Operation not permitted
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ItemNotExists: Container does not exist
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"""
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return []
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def list_object_permissions(self, user, account, container, prefix=''): |
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"""Return a list of paths enforce permissions under a container.
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Raises:
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NotAllowedError: Operation not permitted
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"""
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return []
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def list_object_public(self, user, account, container, prefix=''): |
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"""Return a mapping of object paths to public ids under a container."""
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return {}
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def get_object_meta(self, user, account, container, name, domain, |
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version=None, include_user_defined=True): |
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"""Return a dictionary with the object metadata for the domain.
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The keys returned are all user-defined, except:
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'name': The object name
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'bytes': The total data size
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'type': The content type
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'hash': The hashmap hash
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'modified': Last modification timestamp (overall)
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'modified_by': The user that committed the object
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(version requested)
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'version': The version identifier
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'version_timestamp': The version's modification timestamp
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'uuid': A unique identifier that persists data or metadata updates
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and renames
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'checksum': The MD5 sum of the object (may be empty)
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Raises:
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NotAllowedError: Operation not permitted
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ItemNotExists: Container/object does not exist
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VersionNotExists: Version does not exist
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"""
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return {}
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def update_object_meta(self, user, account, container, name, domain, meta, |
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replace=False):
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"""Update object metadata for a domain and return the new version.
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Parameters:
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'domain': Metadata domain
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'meta': Dictionary with metadata to update
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'replace': Replace instead of update
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Raises:
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NotAllowedError: Operation not permitted
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ItemNotExists: Container/object does not exist
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"""
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return '' |
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def get_object_permissions(self, user, account, container, name): |
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"""Return the action allowed on the object, the path
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from which the object gets its permissions from,
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along with a dictionary containing the permissions.
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The dictionary keys are (also used for defining the action):
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'read': The object is readable by the users/groups in the list
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'write': The object is writable by the users/groups in the list
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Raises:
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NotAllowedError: Operation not permitted
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ItemNotExists: Container/object does not exist
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"""
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return {}
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def update_object_permissions(self, user, account, container, name, |
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permissions): |
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"""Update (set) the permissions associated with the object.
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Parameters:
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'permissions': Dictionary with permissions to set
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Raises:
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NotAllowedError: Operation not permitted
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ItemNotExists: Container/object does not exist
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ValueError: Invalid users/groups in permissions
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"""
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return
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def get_object_public(self, user, account, container, name): |
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"""Return the public id of the object if applicable.
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Raises:
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NotAllowedError: Operation not permitted
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ItemNotExists: Container/object does not exist
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"""
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return None |
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def update_object_public(self, user, account, container, name, public): |
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"""Update the public status of the object.
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|
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Parameters:
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'public': Boolean value
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Raises:
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NotAllowedError: Operation not permitted
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ItemNotExists: Container/object does not exist
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"""
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return
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def get_object_hashmap(self, user, account, container, name, version=None): |
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"""Return the object's size and a list with partial hashes.
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Raises:
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NotAllowedError: Operation not permitted
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ItemNotExists: Container/object does not exist
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VersionNotExists: Version does not exist
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"""
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return 0, [] |
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def update_object_hashmap(self, user, account, container, name, size, type, |
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hashmap, checksum, domain, meta=None,
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replace_meta=False, permissions=None): |
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"""Create/update an object's hashmap and return the new version.
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Parameters:
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'domain': Metadata domain
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'meta': Dictionary with metadata to change
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'replace_meta': Replace metadata instead of update
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'permissions': Updated object permissions
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Raises:
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NotAllowedError: Operation not permitted
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ItemNotExists: Container does not exist
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ValueError: Invalid users/groups in permissions
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QuotaError: Account or container quota exceeded
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"""
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return '' |
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|
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def update_object_checksum(self, user, account, container, name, version, |
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checksum): |
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"""Update an object's checksum."""
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return
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|
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def copy_object(self, user, src_account, src_container, src_name, |
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dest_account, dest_container, dest_name, type, domain,
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meta=None, replace_meta=False, permissions=None, |
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src_version=None, delimiter=None): |
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"""Copy an object's data and metadata and return the new version.
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|
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Parameters:
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'domain': Metadata domain
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|
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'meta': Dictionary with metadata to change from source
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to destination
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'replace_meta': Replace metadata instead of update
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'permissions': New object permissions
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|
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'src_version': Copy from the version provided
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|
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'delimiter': Copy objects whose path starts with
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src_name + delimiter
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|
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Raises:
|
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NotAllowedError: Operation not permitted
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589 |
|
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ItemNotExists: Container/object does not exist
|
591 |
|
592 |
VersionNotExists: Version does not exist
|
593 |
|
594 |
ValueError: Invalid users/groups in permissions
|
595 |
|
596 |
QuotaError: Account or container quota exceeded
|
597 |
"""
|
598 |
return '' |
599 |
|
600 |
def move_object(self, user, src_account, src_container, src_name, |
601 |
dest_account, dest_container, dest_name, type, domain,
|
602 |
meta=None, replace_meta=False, permissions=None, |
603 |
delimiter=None):
|
604 |
"""Move an object's data and metadata and return the new version.
|
605 |
|
606 |
Parameters:
|
607 |
'domain': Metadata domain
|
608 |
|
609 |
'meta': Dictionary with metadata to change from source
|
610 |
to destination
|
611 |
|
612 |
'replace_meta': Replace metadata instead of update
|
613 |
|
614 |
'permissions': New object permissions
|
615 |
|
616 |
'delimiter': Move objects whose path starts with
|
617 |
src_name + delimiter
|
618 |
|
619 |
Raises:
|
620 |
NotAllowedError: Operation not permitted
|
621 |
|
622 |
ItemNotExists: Container/object does not exist
|
623 |
|
624 |
ValueError: Invalid users/groups in permissions
|
625 |
|
626 |
QuotaError: Account or container quota exceeded
|
627 |
"""
|
628 |
return '' |
629 |
|
630 |
def delete_object(self, user, account, container, name, until=None, |
631 |
delimiter=None):
|
632 |
"""Delete/purge an object.
|
633 |
|
634 |
Parameters:
|
635 |
'delimiter': Delete objects whose path starting with
|
636 |
name + delimiter
|
637 |
|
638 |
Raises:
|
639 |
NotAllowedError: Operation not permitted
|
640 |
|
641 |
ItemNotExists: Container/object does not exist
|
642 |
"""
|
643 |
return
|
644 |
|
645 |
def list_versions(self, user, account, container, name): |
646 |
"""Return a list of all object (version, version_timestamp) tuples.
|
647 |
|
648 |
Raises:
|
649 |
NotAllowedError: Operation not permitted
|
650 |
"""
|
651 |
return []
|
652 |
|
653 |
def get_uuid(self, user, uuid): |
654 |
"""Return the (account, container, name) for the UUID given.
|
655 |
|
656 |
Raises:
|
657 |
NotAllowedError: Operation not permitted
|
658 |
|
659 |
NameError: UUID does not exist
|
660 |
"""
|
661 |
return None |
662 |
|
663 |
def get_public(self, user, public): |
664 |
"""Return the (account, container, name) for the public id given.
|
665 |
|
666 |
Raises:
|
667 |
NotAllowedError: Operation not permitted
|
668 |
|
669 |
NameError: Public id does not exist
|
670 |
"""
|
671 |
return None |
672 |
|
673 |
def get_block(self, hash): |
674 |
"""Return a block's data.
|
675 |
|
676 |
Raises:
|
677 |
ItemNotExists: Block does not exist
|
678 |
"""
|
679 |
return '' |
680 |
|
681 |
def put_block(self, data): |
682 |
"""Store a block and return the hash."""
|
683 |
return 0 |
684 |
|
685 |
def update_block(self, hash, data, offset=0): |
686 |
"""Update a known block and return the hash.
|
687 |
|
688 |
Raises:
|
689 |
IndexError: Offset or data outside block limits
|
690 |
"""
|
691 |
return 0 |
692 |
|
693 |
def get_domain_objects(self, domain, user=None): |
694 |
"""Return a list of tuples for objects under the domain.
|
695 |
|
696 |
Parameters:
|
697 |
'user': return only objects accessible to the user.
|
698 |
"""
|