358 lines
13 KiB
Python
358 lines
13 KiB
Python
import logging
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import dateutil.parser
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from peewee import JOIN_LEFT_OUTER, fn
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from datetime import datetime
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from data.model import DataModelException, db_transaction, _basequery, storage
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from data.database import (Image, Repository, ImageStoragePlacement, Namespace, ImageStorage,
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ImageStorageLocation, RepositoryPermission, db_for_update)
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logger = logging.getLogger(__name__)
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def get_parent_images(namespace_name, repository_name, image_obj):
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""" Returns a list of parent Image objects in chronilogical order. """
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parents = image_obj.ancestors
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# Ancestors are in the format /<root>/<intermediate>/.../<parent>/, with each path section
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# containing the database Id of the image row.
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parent_db_ids = parents.strip('/').split('/')
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if parent_db_ids == ['']:
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return []
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def filter_to_parents(query):
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return query.where(Image.id << parent_db_ids)
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parents = get_repository_images_base(namespace_name, repository_name, filter_to_parents)
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id_to_image = {unicode(image.id): image for image in parents}
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return [id_to_image[parent_id] for parent_id in parent_db_ids]
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def get_repo_image(namespace_name, repository_name, docker_image_id):
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def limit_to_image_id(query):
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return query.where(Image.docker_image_id == docker_image_id).limit(1)
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query = _get_repository_images(namespace_name, repository_name, limit_to_image_id)
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try:
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return query.get()
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except Image.DoesNotExist:
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return None
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def get_repo_image_extended(namespace_name, repository_name, docker_image_id):
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def limit_to_image_id(query):
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return query.where(Image.docker_image_id == docker_image_id).limit(1)
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images = get_repository_images_base(namespace_name, repository_name, limit_to_image_id)
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if not images:
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return None
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return images[0]
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def _get_repository_images(namespace_name, repository_name, query_modifier):
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query = (Image
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.select()
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.join(Repository)
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.join(Namespace, on=(Repository.namespace_user == Namespace.id))
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.where(Repository.name == repository_name, Namespace.username == namespace_name))
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query = query_modifier(query)
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return query
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def get_repository_images_base(namespace_name, repository_name, query_modifier):
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query = (ImageStoragePlacement
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.select(ImageStoragePlacement, Image, ImageStorage, ImageStorageLocation)
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.join(ImageStorageLocation)
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.switch(ImageStoragePlacement)
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.join(ImageStorage, JOIN_LEFT_OUTER)
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.join(Image)
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.join(Repository)
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.join(Namespace, on=(Repository.namespace_user == Namespace.id))
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.where(Repository.name == repository_name, Namespace.username == namespace_name))
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query = query_modifier(query)
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return invert_placement_query_results(query)
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def invert_placement_query_results(placement_query):
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""" This method will take a query which returns placements, storages, and images, and have it
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return images and their storages, along with the placement set on each storage.
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"""
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location_list = list(placement_query)
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images = {}
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for location in location_list:
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# Make sure we're always retrieving the same image object.
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image = location.storage.image
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# Set the storage to the one we got from the location, to prevent another query
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image.storage = location.storage
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if not image.id in images:
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images[image.id] = image
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image.storage.locations = set()
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else:
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image = images[image.id]
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# Add the location to the image's locations set.
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image.storage.locations.add(location.location.name)
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return images.values()
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def lookup_repository_images(namespace_name, repository_name, docker_image_ids):
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return (Image
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.select()
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.join(Repository)
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.join(Namespace, on=(Repository.namespace_user == Namespace.id))
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.where(Repository.name == repository_name, Namespace.username == namespace_name,
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Image.docker_image_id << docker_image_ids))
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def get_matching_repository_images(namespace_name, repository_name, docker_image_ids):
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def modify_query(query):
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return query.where(Image.docker_image_id << docker_image_ids)
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return get_repository_images_base(namespace_name, repository_name, modify_query)
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def get_repository_images_without_placements(repo_obj, with_ancestor=None):
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query = (Image
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.select(Image, ImageStorage)
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.join(ImageStorage)
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.where(Image.repository == repo_obj))
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if with_ancestor:
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ancestors_string = '%s%s/' % (with_ancestor.ancestors, with_ancestor.id)
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query = query.where((Image.ancestors ** (ancestors_string + '%')) |
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(Image.id == with_ancestor.id))
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return query
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def get_repository_images(namespace_name, repository_name):
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return get_repository_images_base(namespace_name, repository_name, lambda q: q)
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def get_image_by_id(namespace_name, repository_name, docker_image_id):
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image = get_repo_image_extended(namespace_name, repository_name, docker_image_id)
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if not image:
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raise DataModelException('Unable to find image \'%s\' for repo \'%s/%s\'' %
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(docker_image_id, namespace_name, repository_name))
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return image
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def __translate_ancestry(old_ancestry, translations, repo_obj, username, preferred_location):
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if old_ancestry == '/':
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return '/'
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def translate_id(old_id, docker_image_id):
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logger.debug('Translating id: %s', old_id)
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if old_id not in translations:
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image_in_repo = find_create_or_link_image(docker_image_id, repo_obj, username, translations,
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preferred_location)
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translations[old_id] = image_in_repo.id
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return translations[old_id]
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# Select all the ancestor Docker IDs in a single query.
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old_ids = [int(id_str) for id_str in old_ancestry.split('/')[1:-1]]
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query = Image.select(Image.id, Image.docker_image_id).where(Image.id << old_ids)
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old_images = {i.id: i.docker_image_id for i in query}
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# Translate the old images into new ones.
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new_ids = [str(translate_id(old_id, old_images[old_id])) for old_id in old_ids]
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return '/%s/' % '/'.join(new_ids)
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def _find_or_link_image(existing_image, repo_obj, username, translations, preferred_location):
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# TODO(jake): This call is currently recursively done under a single transaction. Can we make
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# it instead be done under a set of transactions?
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with db_transaction():
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# Check for an existing image, under the transaction, to make sure it doesn't already exist.
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repo_image = get_repo_image(repo_obj.namespace_user.username, repo_obj.name,
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existing_image.docker_image_id)
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if repo_image:
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return repo_image
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# Make sure the existing base image still exists.
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try:
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to_copy = Image.select().join(ImageStorage).where(Image.id == existing_image.id).get()
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msg = 'Linking image to existing storage with docker id: %s and uuid: %s'
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logger.debug(msg, existing_image.docker_image_id, to_copy.storage.uuid)
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new_image_ancestry = __translate_ancestry(to_copy.ancestors, translations, repo_obj,
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username, preferred_location)
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copied_storage = to_copy.storage
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copied_storage.locations = {placement.location.name
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for placement in copied_storage.imagestorageplacement_set}
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new_image = Image.create(docker_image_id=existing_image.docker_image_id,
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repository=repo_obj, storage=copied_storage,
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ancestors=new_image_ancestry,
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command=existing_image.command,
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created=existing_image.created,
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comment=existing_image.comment,
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v1_json_metadata=existing_image.v1_json_metadata,
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aggregate_size=existing_image.aggregate_size)
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logger.debug('Storing translation %s -> %s', existing_image.id, new_image.id)
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translations[existing_image.id] = new_image.id
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return new_image
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except Image.DoesNotExist:
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return None
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def find_create_or_link_image(docker_image_id, repo_obj, username, translations,
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preferred_location):
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# First check for the image existing in the repository. If found, we simply return it.
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repo_image = get_repo_image(repo_obj.namespace_user.username, repo_obj.name,
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docker_image_id)
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if repo_image:
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return repo_image
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# We next check to see if there is an existing storage the new image can link to.
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existing_image_query = (Image
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.select(Image, ImageStorage)
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.distinct()
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.join(ImageStorage)
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.switch(Image)
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.join(Repository)
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.join(RepositoryPermission, JOIN_LEFT_OUTER)
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.switch(Repository)
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.join(Namespace, on=(Repository.namespace_user == Namespace.id))
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.where(ImageStorage.uploading == False,
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Image.docker_image_id == docker_image_id))
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existing_image_query = _basequery.filter_to_repos_for_user(existing_image_query, username)
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# If there is an existing image, we try to translate its ancestry and copy its storage.
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new_image = None
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try:
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logger.debug('Looking up existing image for ID: %s', docker_image_id)
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existing_image = existing_image_query.get()
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logger.debug('Existing image %s found for ID: %s', existing_image.id, docker_image_id)
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new_image = _find_or_link_image(existing_image, repo_obj, username, translations,
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preferred_location)
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if new_image:
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return new_image
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except Image.DoesNotExist:
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logger.debug('No existing image found for ID: %s', docker_image_id)
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# Otherwise, create a new storage directly.
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with db_transaction():
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# Final check for an existing image, under the transaction.
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repo_image = get_repo_image(repo_obj.namespace_user.username, repo_obj.name,
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docker_image_id)
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if repo_image:
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return repo_image
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logger.debug('Creating new storage for docker id: %s', docker_image_id)
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new_storage = storage.create_storage(preferred_location)
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return Image.create(docker_image_id=docker_image_id,
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repository=repo_obj, storage=new_storage,
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ancestors='/')
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def set_image_metadata(docker_image_id, namespace_name, repository_name, created_date_str, comment,
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command, v1_json_metadata, parent=None):
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with db_transaction():
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query = (Image
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.select(Image, ImageStorage)
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.join(Repository)
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.join(Namespace, on=(Repository.namespace_user == Namespace.id))
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.switch(Image)
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.join(ImageStorage)
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.where(Repository.name == repository_name, Namespace.username == namespace_name,
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Image.docker_image_id == docker_image_id))
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try:
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fetched = db_for_update(query).get()
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except Image.DoesNotExist:
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raise DataModelException('No image with specified id and repository')
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# We cleanup any old checksum in case it's a retry after a fail
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fetched.storage.checksum = None
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fetched.created = datetime.now()
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if created_date_str is not None:
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try:
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fetched.created = dateutil.parser.parse(created_date_str).replace(tzinfo=None)
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except:
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# parse raises different exceptions, so we cannot use a specific kind of handler here.
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pass
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fetched.comment = comment
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fetched.command = command
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fetched.v1_json_metadata = v1_json_metadata
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if parent:
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fetched.ancestors = '%s%s/' % (parent.ancestors, parent.id)
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fetched.save()
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fetched.storage.save()
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return fetched
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def set_image_size(docker_image_id, namespace_name, repository_name, image_size, uncompressed_size):
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if image_size is None:
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raise DataModelException('Empty image size field')
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try:
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image = (Image
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.select(Image, ImageStorage)
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.join(Repository)
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.join(Namespace, on=(Repository.namespace_user == Namespace.id))
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.switch(Image)
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.join(ImageStorage, JOIN_LEFT_OUTER)
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.where(Repository.name == repository_name, Namespace.username == namespace_name,
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Image.docker_image_id == docker_image_id)
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.get())
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except Image.DoesNotExist:
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raise DataModelException('No image with specified id and repository')
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image.storage.image_size = image_size
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image.storage.uncompressed_size = uncompressed_size
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ancestors = image.ancestors.split('/')[1:-1]
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if ancestors:
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try:
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# TODO(jschorr): Switch to this faster route once we have full ancestor aggregate_size
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# parent_image = Image.get(Image.id == ancestors[-1])
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ancestor_size = (ImageStorage
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.select(fn.Sum(ImageStorage.image_size))
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.join(Image)
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.where(Image.id << ancestors)
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.scalar())
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if ancestor_size is not None:
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image.aggregate_size = ancestor_size + image_size
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except Image.DoesNotExist:
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pass
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else:
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image.aggregate_size = image_size
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image.storage.save()
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image.save()
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return image
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def get_image(repo, dockerfile_id):
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try:
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return Image.get(Image.docker_image_id == dockerfile_id, Image.repository == repo)
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except Image.DoesNotExist:
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return None
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