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from collections import namedtuple
from gettext import gettext as _
from urllib.parse import urljoin
import json
import logging
from celery import shared_task
from django.db.models import Q
from pulpcore.plugin import models
from pulpcore.plugin.changeset import (
ChangeSet,
PendingArtifact,
PendingContent,
SizedIterable,
)
from pulpcore.plugin.tasking import WorkingDirectory, UserFacingTask
from pulp_python.app import models as python_models
log = logging.getLogger(__name__)
Delta = namedtuple('Delta', ('additions', 'removals'))
@shared_task(base=UserFacingTask)
def sync(importer_pk, repository_pk):
importer = python_models.PythonImporter.objects.get(pk=importer_pk)
repository = models.Repository.objects.get(pk=repository_pk)
if not importer.feed_url:
raise ValueError(_("An importer must have a feed_url attribute to sync."))
base_version = models.RepositoryVersion.latest(repository)
with models.RepositoryVersion.create(repository) as new_version:
with WorkingDirectory():
log.info(
_('Creating RepositoryVersion: repository=%(repository)s importer=%(importer)s'),
{
'repository': repository.name,
'importer': importer.name
})
inventory = _fetch_inventory(base_version)
remote_metadata = _fetch_remote(importer)
remote_keys = set([content['filename'] for content in remote_metadata])
mirror = importer.sync_mode == 'mirror'
delta = _find_delta(inventory=inventory, remote=remote_keys,
mirror=mirror)
additions = SizedIterable(
_build_additions(delta.additions, remote_metadata),
len(delta.additions))
removals = SizedIterable(
_build_removals(delta.removals, base_version),
len(delta.removals))
changeset = ChangeSet(importer, new_version, additions=additions, removals=removals)
changeset.apply_and_drain()
def _fetch_inventory(version):
"""
Fetch the contentunits in the specified repository version
Args:
version (pulpcore.plugin.models.RepositoryVersion): version of repository to fetch
content units from
Returns:
set: of contentunit filenames.
"""
inventory = set()
if version is not None:
q_set = version.content
if q_set:
for content in (c.cast() for c in q_set):
inventory.add(content.filename)
return inventory
def _fetch_remote(importer):
"""
Fetch contentunits available in the remote repository.
Returns:
list: of contentunit metadata.
"""
remote = []
metadata_urls = [urljoin(importer.feed_url, 'pypi/%s/json' % project)
for project in json.loads(importer.projects)]
for metadata_url in metadata_urls:
downloader = importer.get_downloader(metadata_url)
downloader.fetch()
metadata = json.load(open(downloader.path))
for version, packages in metadata['releases'].items():
for package in packages:
remote.append(_parse_metadata(metadata['info'], version, package))
return remote
def _find_delta(inventory, remote, mirror=False):
"""
Using the existing and remote set of filenames, determine the set of content to be
added and deleted from the repository.
Parameters:
inventory (set): existing natural keys (filename) of content associated
with the repository
remote (set): metadata keys (filename) of packages on the remote index
mirror (bool): When true, any content removed from remote repository is added to
the delta.removals. When false, delta.removals is an empty set.
Returns:
Delta (namedtuple): tuple of content to add, and content to remove from the repository
"""
additions = remote - inventory
removals = inventory - remote if mirror else set()
return Delta(additions=additions, removals=removals)
def _parse_metadata(project, version, distribution):
"""
Create a dictionary of metadata needed to create a PythonContentUnit from
the project, version, and distribution metadata
Args:
project (dict): of metadata relevant to the entire Python project
version (string): version of distribution
distribution (dict): of metadata of a single Python distribution
Returns:
dictionary: of useful python metadata
"""
package = {}
package['filename'] = distribution['filename']
package['packagetype'] = distribution['packagetype']
package['name'] = project['name']
package['version'] = version
package['metadata_version'] = project.get('metadata_version')
package['summary'] = project.get('summary')
package['description'] = project.get('description')
package['keywords'] = project.get('keywords')
package['home_page'] = project.get('home_page')
package['download_url'] = project.get('download_url')
package['author'] = project.get('author')
package['author_email'] = project.get('author_email')
package['maintainer'] = project.get('maintainer')
package['maintainer_email'] = project.get('maintainer_email')
package['license'] = project.get('license')
package['requires_python'] = project.get('requires_python')
package['project_url'] = project.get('project_url')
package['platform'] = project.get('platform')
package['supported_platform'] = project.get('supported_platform')
package['requires_dist'] = json.dumps(project.get('requires_dist', []))
package['provides_dist'] = json.dumps(project.get('provides_dist', []))
package['obsoletes_dist'] = json.dumps(project.get('obsoletes_dist', []))
package['requires_external'] = json.dumps(project.get('requires_external', []))
package['url'] = distribution['url']
package['md5_digest'] = distribution['md5_digest']
return package
def _build_additions(additions, remote_metadata):
"""
Generate the content to be added.
Returns:
generator: A generator of content to be added.
"""
for entry in remote_metadata:
if(entry['filename'] not in additions):
continue
url = entry.pop('url')
artifact = models.Artifact(md5=entry.pop('md5_digest'))
package = python_models.PythonPackageContent(**entry)
content = PendingContent(
package,
artifacts={
PendingArtifact(model=artifact, url=url, relative_path=entry['filename'])
})
yield content
def _build_removals(removals, version):
"""
Generate the content to be removed.
Args:
removals (set): of filenames to remove
version (pulpcore.plugin.models.RepositoryVersion): of repository to remove contents
from
Returns:
generator: A generator of content to be removed.
"""
q = Q()
for content_key in removals:
q |= Q(pythonpackagecontent__filename=content_key)
q_set = version.content.filter(q)
q_set = q_set.only('id')
for content in q_set:
yield content