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import json
import logging
from collections import namedtuple
from gettext import gettext as _
from urllib.parse import urljoin
from django.db.models import Q
from packaging import specifiers
from rest_framework import serializers
from pulpcore.plugin import models
from pulpcore.plugin.changeset import (
BatchIterator,
ChangeSet,
PendingArtifact,
PendingContent,
SizedIterable,
)
from pulpcore.plugin.tasking import WorkingDirectory
from pulp_python.app import models as python_models
from pulp_python.app.utils import parse_metadata
log = logging.getLogger(__name__)
Delta = namedtuple('Delta', ('additions', 'removals'))
def sync(remote_pk, repository_pk):
remote = python_models.PythonRemote.objects.get(pk=remote_pk)
repository = models.Repository.objects.get(pk=repository_pk)
if not remote.url:
raise serializers.ValidationError(
detail=_("A remote must have a 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} remote={remote}')
.format(repository=repository.name, remote=remote.name)
)
project_specifiers = python_models.ProjectSpecifier.objects.filter(remote=remote).all()
inventory_keys = _fetch_inventory(base_version)
remote_metadata = _fetch_specified_metadata(remote, project_specifiers)
remote_keys = set([content['filename'] for content in remote_metadata])
delta = _find_delta(inventory=inventory_keys, remote=remote_keys)
additions = _build_additions(delta, remote_metadata)
removals = _build_removals(delta, base_version)
changeset = ChangeSet(remote, 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:
for content in python_models.PythonPackageContent.objects.filter(
pk__in=version.content).only("filename"):
inventory.add(content.filename)
return inventory
def _fetch_specified_metadata(remote, project_specifiers):
"""
Fetch content units matching the project specifiers available in
the remote repository.
Returns:
list: of contentunit metadata.
"""
remote_units = []
for project in project_specifiers:
digests = python_models.DistributionDigest.objects.filter(project_specifier=project)
metadata_url = urljoin(remote.url, 'pypi/%s/json' % project.name)
downloader = remote.get_downloader(metadata_url)
downloader.fetch()
metadata = json.load(open(downloader.path))
for version, packages in metadata['releases'].items():
for package in packages:
# If neither specifiers nor digests have been set, then we should add the unit
if not project.version_specifier and not digests.exists():
remote_units.append(parse_metadata(metadata['info'], version, package))
continue
specifier = specifiers.SpecifierSet(project.version_specifier)
# Note: SpecifierSet("").contains(version) will return true for released versions
# SpecifierSet("").contains('3.0.0') returns True
# SpecifierSet("").contains('3.0.0b1') returns False
if specifier.contains(version):
# add the package if the project specifier does not have an associated digest
if not digests.exists():
remote_units.append(parse_metadata(metadata['info'], version, package))
# otherwise check each digest to see if it matches the specifier
else:
for type, digest in package['digests'].items():
if digests.filter(type=type, digest=digest).exists():
remote_units.append(parse_metadata(metadata['info'],
version,
package))
break
return remote_units
def _find_delta(inventory, remote):
"""
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
Returns:
Delta (namedtuple): tuple of content to add, and content to remove from the repository
"""
additions = remote - inventory
removals = inventory - remote
return Delta(additions=additions, removals=removals)
def _build_additions(delta, remote_metadata):
"""
Generate the content to be added.
Args:
delta (namedtuple): tuple of content to add, and content to remove from the repository
remote_metadata (list): list of contentunit metadata
Returns:
The PythonPackageContent to be added to the repository.
"""
def generate():
for entry in remote_metadata:
if entry['filename'] not in delta.additions:
continue
url = entry.pop('url')
artifact = models.Artifact(sha256=entry.pop('sha256_digest'))
package = python_models.PythonPackageContent(**entry)
content = PendingContent(
package,
artifacts={
PendingArtifact(model=artifact, url=url, relative_path=entry['filename'])
})
yield content
return SizedIterable(generate(), len(delta.additions))
def _build_removals(delta, version):
"""
Generate the content to be removed.
Args:
delta (namedtuple): tuple of content to add, and content to remove from the repository
version (pulpcore.plugin.models.RepositoryVersion): of repository to remove contents
from
Returns:
The PythonPackageContent to be removed from the repository.
"""
def generate():
for removals in BatchIterator(delta.removals):
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
return SizedIterable(generate(), len(delta.removals))