1 # Copyright 2011 GRNET S.A. All rights reserved.
3 # Redistribution and use in source and binary forms, with or
4 # without modification, are permitted provided that the following
7 # 1. Redistributions of source code must retain the above
8 # copyright notice, this list of conditions and the following
11 # 2. Redistributions in binary form must reproduce the above
12 # copyright notice, this list of conditions and the following
13 # disclaimer in the documentation and/or other materials
14 # provided with the distribution.
16 # THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
17 # OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
18 # WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
19 # PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
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21 # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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24 # AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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26 # ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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29 # The views and conclusions contained in the software and
30 # documentation are those of the authors and should not be
31 # interpreted as representing official policies, either expressed
32 # or implied, of GRNET S.A.
34 # Default setting for new accounts.
35 DEFAULT_QUOTA = 0 # No quota.
36 DEFAULT_VERSIONING = 'auto'
39 class NotAllowedError(Exception):
42 class QuotaError(Exception):
45 class BaseBackend(object):
46 """Abstract backend class that serves as a reference for actual implementations.
48 The purpose of the backend is to provide the necessary functions for handling data
49 and metadata. It is responsible for the actual storage and retrieval of information.
51 Note that the account level is always valid as it is checked from another subsystem.
53 When not replacing metadata/groups/policy, keys with empty values should be deleted.
55 The following variables should be available:
56 'hash_algorithm': Suggested is 'sha256'
58 'block_size': Suggested is 4MB
60 'default_policy': A dictionary with default policy settings
64 """Close the backend connection."""
67 def list_accounts(self, user, marker=None, limit=10000):
68 """Return a list of accounts the user can access.
71 'marker': Start list from the next item after 'marker'
73 'limit': Number of containers to return
77 def get_account_meta(self, user, account, domain, until=None):
78 """Return a dictionary with the account metadata for the domain.
80 The keys returned are all user-defined, except:
81 'name': The account name
83 'count': The number of containers (or 0)
85 'bytes': The total data size (or 0)
87 'modified': Last modification timestamp (overall)
89 'until_timestamp': Last modification until the timestamp provided
92 NotAllowedError: Operation not permitted
96 def update_account_meta(self, user, account, domain, meta, replace=False):
97 """Update the metadata associated with the account for the domain.
100 'domain': Metadata domain
102 'meta': Dictionary with metadata to update
104 'replace': Replace instead of update
107 NotAllowedError: Operation not permitted
111 def get_account_groups(self, user, account):
112 """Return a dictionary with the user groups defined for this account.
115 NotAllowedError: Operation not permitted
119 def update_account_groups(self, user, account, groups, replace=False):
120 """Update the groups associated with the account.
123 NotAllowedError: Operation not permitted
125 ValueError: Invalid data in groups
129 def get_account_policy(self, user, account):
130 """Return a dictionary with the account policy.
132 The keys returned are:
133 'quota': The maximum bytes allowed (default is 0 - unlimited)
135 'versioning': Can be 'auto', 'manual' or 'none' (default is 'manual')
138 NotAllowedError: Operation not permitted
142 def update_account_policy(self, user, account, policy, replace=False):
143 """Update the policy associated with the account.
146 NotAllowedError: Operation not permitted
148 ValueError: Invalid policy defined
152 def put_account(self, user, account, policy={}):
153 """Create a new account with the given name.
156 NotAllowedError: Operation not permitted
158 ValueError: Invalid policy defined
162 def delete_account(self, user, account):
163 """Delete the account with the given name.
166 NotAllowedError: Operation not permitted
168 IndexError: Account is not empty
172 def list_containers(self, user, account, marker=None, limit=10000, shared=False, until=None):
173 """Return a list of container names existing under an account.
176 'marker': Start list from the next item after 'marker'
178 'limit': Number of containers to return
180 'shared': Only list containers with permissions set
184 NotAllowedError: Operation not permitted
188 def get_container_meta(self, user, account, container, domain, until=None):
189 """Return a dictionary with the container metadata for the domain.
191 The keys returned are all user-defined, except:
192 'name': The container name
194 'count': The number of objects
196 'bytes': The total data size
198 'modified': Last modification timestamp (overall)
200 'until_timestamp': Last modification until the timestamp provided
203 NotAllowedError: Operation not permitted
205 NameError: Container does not exist
209 def update_container_meta(self, user, account, container, domain, meta, replace=False):
210 """Update the metadata associated with the container for the domain.
213 'domain': Metadata domain
215 'meta': Dictionary with metadata to update
217 'replace': Replace instead of update
220 NotAllowedError: Operation not permitted
222 NameError: Container does not exist
226 def get_container_policy(self, user, account, container):
227 """Return a dictionary with the container policy.
229 The keys returned are:
230 'quota': The maximum bytes allowed (default is 0 - unlimited)
232 'versioning': Can be 'auto', 'manual' or 'none' (default is 'manual')
235 NotAllowedError: Operation not permitted
237 NameError: Container does not exist
241 def update_container_policy(self, user, account, container, policy, replace=False):
242 """Update the policy associated with the container.
245 NotAllowedError: Operation not permitted
247 NameError: Container does not exist
249 ValueError: Invalid policy defined
253 def put_container(self, user, account, container, policy={}):
254 """Create a new container with the given name.
257 NotAllowedError: Operation not permitted
259 NameError: Container already exists
261 ValueError: Invalid policy defined
265 def delete_container(self, user, account, container, until=None):
266 """Delete/purge the container with the given name.
269 NotAllowedError: Operation not permitted
271 NameError: Container does not exist
273 IndexError: Container is not empty
277 def list_objects(self, user, account, container, prefix='', delimiter=None, marker=None, limit=10000, virtual=True, domain=None, keys=[], shared=False, until=None, size_range=None):
278 """Return a list of object (name, version_id) tuples existing under a container.
281 'prefix': List objects starting with 'prefix'
283 'delimiter': Return unique names before 'delimiter' and after 'prefix'
285 'marker': Start list from the next item after 'marker'
287 'limit': Number of objects to return
289 'virtual': If not set, the result will only include names starting
290 with 'prefix' and ending without a 'delimiter' or with
291 the first occurance of the 'delimiter' after 'prefix'.
292 If set, the result will include all names after 'prefix',
293 up to and including the 'delimiter' if it is found
295 'domain': Metadata domain for keys
297 'keys': Include objects that satisfy the key queries in the list.
298 Use 'key', '!key' for existence queries, 'key op value' for
299 value queries, where 'op' can be one of =, !=, <=, >=, <, >
301 'shared': Only list objects with permissions set
303 'size_range': Include objects with byte size in (from, to).
304 Use None to specify unlimited
307 NotAllowedError: Operation not permitted
309 NameError: Container does not exist
313 def list_object_meta(self, user, account, container, domain, until=None):
314 """Return a list with all the container's object meta keys for the domain.
317 NotAllowedError: Operation not permitted
319 NameError: Container does not exist
323 def get_object_meta(self, user, account, container, name, domain, version=None):
324 """Return a dictionary with the object metadata for the domain.
326 The keys returned are all user-defined, except:
327 'name': The object name
329 'bytes': The total data size
331 'hash': The hashmap hash
333 'modified': Last modification timestamp (overall)
335 'modified_by': The user that committed the object (version requested)
337 'version': The version identifier
339 'version_timestamp': The version's modification timestamp
341 'uuid': A unique identifier that persists data or metadata updates and renames
344 NotAllowedError: Operation not permitted
346 NameError: Container/object does not exist
348 IndexError: Version does not exist
352 def update_object_meta(self, user, account, container, name, domain, meta, replace=False):
353 """Update the metadata associated with the object for the domain and return the new version.
356 'domain': Metadata domain
358 'meta': Dictionary with metadata to update
360 'replace': Replace instead of update
363 NotAllowedError: Operation not permitted
365 NameError: Container/object does not exist
369 def get_object_permissions(self, user, account, container, name):
370 """Return the action allowed on the object, the path
371 from which the object gets its permissions from,
372 along with a dictionary containing the permissions.
374 The dictionary keys are (also used for defining the action):
375 'read': The object is readable by the users/groups in the list
377 'write': The object is writable by the users/groups in the list
380 NotAllowedError: Operation not permitted
382 NameError: Container/object does not exist
386 def update_object_permissions(self, user, account, container, name, permissions):
387 """Update the permissions associated with the object.
390 'permissions': Dictionary with permissions to update
393 NotAllowedError: Operation not permitted
395 NameError: Container/object does not exist
397 ValueError: Invalid users/groups in permissions
399 AttributeError: Can not set permissions, as this object
400 is already shared/private by another object higher
401 in the hierarchy, or setting permissions here will
402 invalidate other permissions deeper in the hierarchy
406 def get_object_public(self, user, account, container, name):
407 """Return the public id of the object if applicable.
410 NotAllowedError: Operation not permitted
412 NameError: Container/object does not exist
416 def update_object_public(self, user, account, container, name, public):
417 """Update the public status of the object.
420 'public': Boolean value
423 NotAllowedError: Operation not permitted
425 NameError: Container/object does not exist
429 def get_object_hashmap(self, user, account, container, name, version=None):
430 """Return the object's size and a list with partial hashes.
433 NotAllowedError: Operation not permitted
435 NameError: Container/object does not exist
437 IndexError: Version does not exist
441 def update_object_hashmap(self, user, account, container, name, size, hashmap, domain, meta={}, replace_meta=False, permissions=None):
442 """Create/update an object with the specified size and partial hashes and return the new version.
445 'domain': Metadata domain
447 'meta': Dictionary with metadata to change
449 'replace_meta': Replace metadata instead of update
451 'permissions': Updated object permissions
454 NotAllowedError: Operation not permitted
456 NameError: Container does not exist
458 ValueError: Invalid users/groups in permissions
460 AttributeError: Can not set permissions
462 QuotaError: Account or container quota exceeded
466 def copy_object(self, user, src_account, src_container, src_name, dest_account, dest_container, dest_name, domain, meta={}, replace_meta=False, permissions=None, src_version=None):
467 """Copy an object's data and metadata and return the new version.
470 'domain': Metadata domain
472 'meta': Dictionary with metadata to change from source to destination
474 'replace_meta': Replace metadata instead of update
476 'permissions': New object permissions
478 'src_version': Copy from the version provided
481 NotAllowedError: Operation not permitted
483 NameError: Container/object does not exist
485 IndexError: Version does not exist
487 ValueError: Invalid users/groups in permissions
489 AttributeError: Can not set permissions
491 QuotaError: Account or container quota exceeded
495 def move_object(self, user, src_account, src_container, src_name, dest_account, dest_container, dest_name, domain, meta={}, replace_meta=False, permissions=None):
496 """Move an object's data and metadata and return the new version.
499 'domain': Metadata domain
501 'meta': Dictionary with metadata to change from source to destination
503 'replace_meta': Replace metadata instead of update
505 'permissions': New object permissions
508 NotAllowedError: Operation not permitted
510 NameError: Container/object does not exist
512 ValueError: Invalid users/groups in permissions
514 AttributeError: Can not set permissions
516 QuotaError: Account or container quota exceeded
520 def delete_object(self, user, account, container, name, until=None):
521 """Delete/purge an object.
524 NotAllowedError: Operation not permitted
526 NameError: Container/object does not exist
530 def list_versions(self, user, account, container, name):
531 """Return a list of all (version, version_timestamp) tuples for an object.
534 NotAllowedError: Operation not permitted
538 def get_uuid(self, user, uuid):
539 """Return the (account, container, name) for the UUID given.
542 NotAllowedError: Operation not permitted
544 NameError: UUID does not exist
548 def get_public(self, user, public):
549 """Return the (account, container, name) for the public id given.
552 NotAllowedError: Operation not permitted
554 NameError: Public id does not exist
558 def get_block(self, hash):
559 """Return a block's data.
562 NameError: Block does not exist
566 def put_block(self, data):
567 """Store a block and return the hash."""
570 def update_block(self, hash, data, offset=0):
571 """Update a known block and return the hash.
574 IndexError: Offset or data outside block limits