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quay/data/model/image.py
2015-10-15 13:25:54 -04:00

360 lines
13 KiB
Python

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