Glance database architecture section
Adds a database architecture description section to the Glance Developer guide. Change-Id: Ice951ecc344a1172d5bffc4f5d0dc329b75e9483 Co-Authored-By: Mike Fedosin <mfedosin@mirantis.com> Co-Authored-By: Olena Logvinova <ologvinova@mirantis.com>
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Olena Logvinova
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Copyright 2015 OpenStack Foundation
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All Rights Reserved.
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Licensed under the Apache License, Version 2.0 (the "License"); you may
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not use this file except in compliance with the License. You may obtain
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a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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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, WITHOUT
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WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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License for the specific language governing permissions and limitations
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under the License.
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============================
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Glance database architecture
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============================
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Glance Database Public API
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~~~~~~~~~~~~~~~~~~~~~~~~~~
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Glance DB API contains several methods to process information from
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and to a persistent storage. Below you can find a list of public
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methods grouped by categories.
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Common parameters for image methods
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-----------------------------------
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The following parameters can be applied to all the below image methods:
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- ``context`` corresponds to a value with glance.context.RequestContext
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object, which stores the information on how a user accesses
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the system, as well as additional request information;
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- ``image_id`` — a string corresponding to the image identifier;
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- ``memb_id`` — a string corresponding to the member identifier
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of the image.
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Image basic methods
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-------------------
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**Image processing methods:**
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#. ``image_create(context, values)`` - creates a new image record
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with parameters listed in the *values* dictionary. Returns a
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dictionary representation of a newly created *glance.db.sqlalchemy.
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models.Image* object.
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#. ``image_update(context, image_id, values, purge_props=False,
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from_state=None)`` - updates the existing image with an identifier
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*image_id* with values listed in the *values* dictionary. Returns a
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dictionary representation of a newly created *Image* object.
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Optional parameters are:
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- ``purge_props`` - a flag indicating that all the existing
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properties not listed in the *values[‘properties’]* should be
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deleted;
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- ``from_state`` - a string filter indicating that the updated
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image must be in the specified state.
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#. ``image_destroy(context, image_id)`` - deletes all the database
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record of an image with an identifier *image_id*, like tags,
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properties, and members, and sets a ‘deleted’ status to all the
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image locations.
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#. ``image_get(context, image_id, force_show_deleted=False)`` -
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gets an image with an identifier *image_id* and returns its
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dictionary representation. A parameter *force_show_deleted* is
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a flag that indicates to show image info even if it was
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‘deleted’, or its ‘pending_delete’ statuses.
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#. ``image_get_all(context, filters=None, marker=None, limit=None,
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sort_key=None, sort_dir=None, member_status='accepted',
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is_public=None, admin_as_user=False, return_tag=False)`` - gets
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all the images that match zero or more filters.
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Optional parameters are:
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- ``filters`` - dict of filter keys and values. If a 'properties'
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key is present, it is treated as a dict of key/value filters in
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the attribute of the image properties.
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- ``marker`` - image id after which a page should start;
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- ``limit`` - maximum number of images to return;
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- ``sort_key`` - list of image attributes by which results should
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be sorted;
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- ``sort_dir`` - directions in which results should be sorted
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(asc, desc);
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- ``member_status`` - only returns shared images that have this
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membership status;
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- ``is_public`` - if true, returns only public images. If false,
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returns only private and shared images.
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- ``admin_as_user`` - for backwards compatibility. If true, admin
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receives an equivalent set of images that he would see if he was
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a regular user.
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- ``return_tag`` - indicates whether an image entry in the result
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includes its relevant tag entries. This can improve upper-layer
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query performance and prevent using separated calls.
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Image location methods
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----------------------
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**Image location processing methods:**
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#. ``image_location_add(context, image_id, location)`` -
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adds a new location to an image with an identifier image_id. This
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location contains values listed in the dictionary *location*.
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#. ``image_location_update(context, image_id, location)`` - updates
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an existing location with an identifier *location[‘id’]*
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for an image with an identifier *image_id* with values listed in
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the dictionary *location*.
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#. ``image_location_delete(context, image_id, location_id, status,
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delete_time=None)`` - sets a 'deleted' or 'pending_delete'
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*status* to an existing location record with an identifier
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*location_id* for an image with an identifier *image_id*.
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Image property methods
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----------------------
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.. warning:: There is no public property update method.
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So if you want to modify it, you have to delete it first
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and then create a new one.
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**Image property processing methods:**
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#. ``image_property_create(context, values)`` - creates
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a property record with parameters listed in the *values* dictionary
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for an image with *values[‘id’]*. Returns a dictionary representation
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of a newly created *ImageProperty* object.
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#. ``image_property_delete(context, prop_ref, image_ref)`` - deletes an
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existing property record with a name *prop_ref* for an image with
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an identifier *image_ref*.
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Image member methods
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--------------------
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**Methods to handle image memberships:**
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#. ``image_member_create(context, values)`` - creates a member record
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with properties listed in the *values* dictionary for an image
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with *values[‘id’]*. Returns a dictionary representation
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of a newly created *ImageMember* object.
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#. ``image_member_update(context, memb_id, values)`` - updates an
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existing member record with properties listed in the *values*
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dictionary for an image with *values[‘id’]*. Returns a dictionary
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representation of an updated member record.
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#. ``image_member_delete(context, memb_id)`` - deletes an existing
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member record with *memb_id*.
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#. ``image_member_find(context, image_id=None, member=None, status=None)``
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- returns all members for a given context with optional image
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identifier (*image_id*), member name (*member*), and member status
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(*status*) parameters.
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#. ``image_member_count(context, image_id)`` - returns a number of image
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members for an image with *image_id*.
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Image tag methods
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-----------------
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**Methods to process images tags:**
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#. ``image_tag_set_all(context, image_id, tags)`` - changes all the
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existing tags for an image with *image_id* to the tags listed
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in the *tags* param. To remove all tags, a user just should provide
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an empty list.
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#. ``image_tag_create(context, image_id, value)`` - adds a *value*
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to tags for an image with *image_id*. Returns the value of a
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newly created tag.
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#. ``image_tag_delete(context, image_id, value)`` - removes a *value*
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from tags for an image with *image_id*.
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#. ``image_tag_get_all(context, image_id)`` - returns a list of tags
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for a specific image.
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Image info methods
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------------------
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The next two methods inform a user about his ability to modify
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and view an image. *image* param here is a dictionary representation
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of an *Image* object.
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#. ``is_image_mutable(context, image)`` - informs a user
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about the possibility to modify an image with a given context.
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Returns True if the image is mutable in this context.
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#. ``is_image_visible(context, image, status=None)`` - informs about
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the possibility to observe the image details with a given context
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and optionally with a status. Returns True if the image is visible
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in this context.
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**Glance database schema**
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.. figure:: /images/glance_db.png
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:figwidth: 100%
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:align: center
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:alt: Glance images DB schema
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.. centered:: Image 1. Glance images DB schema
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Binary file not shown.
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@ -51,6 +51,7 @@ Glance Background Concepts
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:maxdepth: 1
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||||
architecture
|
||||
database_architecture
|
||||
identifiers
|
||||
statuses
|
||||
formats
|
||||
|
|
|
|||
Loading…
Reference in New Issue