351 lines
11 KiB
Python
351 lines
11 KiB
Python
import json
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from abc import ABCMeta, abstractmethod
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from collections import namedtuple
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from six import add_metaclass
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from data import model
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from image.docker.v1 import DockerV1Metadata
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class Repository(namedtuple('Repository', ['id', 'name', 'namespace_name', 'description',
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'is_public', 'kind'])):
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"""
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Repository represents a namespaced collection of tags.
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:type id: int
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:type name: string
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:type namespace_name: string
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:type description: string
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:type is_public: bool
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:type kind: string
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"""
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class DerivedImage(namedtuple('DerivedImage', ['ref', 'blob', 'internal_source_image_db_id'])):
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"""
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DerivedImage represents a user-facing alias for an image which was derived from another image.
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"""
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class RepositoryReference(namedtuple('RepositoryReference', ['id', 'name', 'namespace_name'])):
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"""
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RepositoryReference represents a reference to a Repository, without its full metadata.
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"""
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class ImageWithBlob(namedtuple('Image', ['image_id', 'blob', 'compat_metadata', 'repository',
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'internal_db_id', 'v1_metadata'])):
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"""
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ImageWithBlob represents a user-facing alias for referencing an image, along with its blob.
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"""
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class Blob(namedtuple('Blob', ['uuid', 'size', 'uncompressed_size', 'uploading', 'locations'])):
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"""
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Blob represents an opaque binary blob saved to the storage system.
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"""
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class TorrentInfo(namedtuple('TorrentInfo', ['piece_length', 'pieces'])):
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"""
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TorrentInfo represents the torrent piece information associated with a blob.
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"""
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@add_metaclass(ABCMeta)
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class VerbsDataInterface(object):
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"""
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Interface that represents all data store interactions required by the registry's custom HTTP
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verbs.
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"""
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@abstractmethod
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def get_repository(self, namespace_name, repo_name):
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"""
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Returns a repository tuple for the repository with the given name under the given namespace.
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Returns None if no such repository was found.
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"""
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pass
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@abstractmethod
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def get_manifest_layers_with_blobs(self, repo_image):
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"""
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Returns the full set of manifest layers and their associated blobs starting at the given
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repository image and working upwards to the root image.
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"""
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pass
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@abstractmethod
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def get_blob_path(self, blob):
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"""
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Returns the storage path for the given blob.
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"""
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pass
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@abstractmethod
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def get_derived_image_signature(self, derived_image, signer_name):
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"""
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Returns the signature associated with the derived image and a specific signer or None if none.
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"""
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pass
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@abstractmethod
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def set_derived_image_signature(self, derived_image, signer_name, signature):
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"""
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Sets the calculated signature for the given derived image and signer to that specified.
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"""
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pass
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@abstractmethod
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def delete_derived_image(self, derived_image):
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"""
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Deletes a derived image and all of its storage.
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"""
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pass
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@abstractmethod
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def set_blob_size(self, blob, size):
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"""
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Sets the size field on a blob to the value specified.
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"""
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pass
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@abstractmethod
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def get_repo_blob_by_digest(self, namespace_name, repo_name, digest):
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"""
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Returns the blob with the given digest under the matching repository or None if none.
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"""
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pass
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@abstractmethod
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def get_torrent_info(self, blob):
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"""
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Returns the torrent information associated with the given blob or None if none.
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"""
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pass
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@abstractmethod
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def set_torrent_info(self, blob, piece_length, pieces):
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"""
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Sets the torrent infomation associated with the given blob to that specified.
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"""
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pass
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@abstractmethod
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def lookup_derived_image(self, repo_image, verb, varying_metadata=None):
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"""
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Looks up the derived image for the given repository image, verb and optional varying metadata
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and returns it or None if none.
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"""
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pass
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@abstractmethod
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def lookup_or_create_derived_image(self, repo_image, verb, location, varying_metadata=None):
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"""
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Looks up the derived image for the given repository image, verb and optional varying metadata
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and returns it. If none exists, a new derived image is created.
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"""
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pass
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@abstractmethod
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def get_tag_image(self, namespace_name, repo_name, tag_name):
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"""
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Returns the image associated with the live tag with the given name under the matching repository
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or None if none.
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"""
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pass
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class PreOCIModel(VerbsDataInterface):
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"""
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PreOCIModel implements the data model for the registry's custom HTTP verbs using a database schema
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before it was changed to support the OCI specification.
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"""
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def get_repository(self, namespace_name, repo_name):
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repo = model.repository.get_repository(namespace_name, repo_name)
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if repo is None:
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return None
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return _repository_for_repo(repo)
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def get_manifest_layers_with_blobs(self, repo_image):
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repo_image_record = model.image.get_image_by_id(repo_image.repository.namespace_name,
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repo_image.repository.name,
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repo_image.image_id)
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parents = model.image.get_parent_images_with_placements(repo_image.repository.namespace_name,
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repo_image.repository.name,
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repo_image_record)
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yield repo_image
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for parent in parents:
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metadata = {}
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try:
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metadata = json.loads(parent.v1_json_metadata)
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except ValueError:
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pass
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yield ImageWithBlob(
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image_id=parent.docker_image_id,
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blob=_blob(parent.storage),
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repository=repo_image.repository,
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compat_metadata=metadata,
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v1_metadata=_docker_v1_metadata(repo_image.repository.namespace_name,
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repo_image.repository.name, parent),
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internal_db_id=parent.id,
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)
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def get_derived_image_signature(self, derived_image, signer_name):
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storage = model.storage.get_storage_by_uuid(derived_image.blob.uuid)
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signature_entry = model.storage.lookup_storage_signature(storage, signer_name)
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if signature_entry is None:
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return None
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return signature_entry.signature
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def set_derived_image_signature(self, derived_image, signer_name, signature):
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storage = model.storage.get_storage_by_uuid(derived_image.blob.uuid)
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signature_entry = model.storage.find_or_create_storage_signature(storage, signer_name)
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signature_entry.signature = signature
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signature_entry.uploading = False
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signature_entry.save()
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def delete_derived_image(self, derived_image):
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model.image.delete_derived_storage_by_uuid(derived_image.blob.uuid)
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def set_blob_size(self, blob, size):
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storage_entry = model.storage.get_storage_by_uuid(blob.uuid)
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storage_entry.image_size = size
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storage_entry.uploading = False
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storage_entry.save()
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def get_blob_path(self, blob):
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blob_record = model.storage.get_storage_by_uuid(blob.uuid)
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return model.storage.get_layer_path(blob_record)
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def get_repo_blob_by_digest(self, namespace_name, repo_name, digest):
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try:
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blob_record = model.blob.get_repo_blob_by_digest(namespace_name, repo_name, digest)
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except model.BlobDoesNotExist:
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return None
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return _blob(blob_record)
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def get_torrent_info(self, blob):
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blob_record = model.storage.get_storage_by_uuid(blob.uuid)
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try:
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torrent_info = model.storage.get_torrent_info(blob_record)
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except model.TorrentInfoDoesNotExist:
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return None
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return TorrentInfo(
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pieces=torrent_info.pieces,
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piece_length=torrent_info.piece_length,
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)
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def set_torrent_info(self, blob, piece_length, pieces):
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blob_record = model.storage.get_storage_by_uuid(blob.uuid)
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model.storage.save_torrent_info(blob_record, piece_length, pieces)
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def lookup_derived_image(self, repo_image, verb, varying_metadata=None):
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blob_record = model.image.find_derived_storage_for_image(repo_image.internal_db_id, verb,
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varying_metadata)
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if blob_record is None:
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return None
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return _derived_image(blob_record, repo_image)
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def lookup_or_create_derived_image(self, repo_image, verb, location, varying_metadata=None):
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blob_record = model.image.find_or_create_derived_storage(repo_image.internal_db_id, verb,
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location, varying_metadata)
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return _derived_image(blob_record, repo_image)
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def get_tag_image(self, namespace_name, repo_name, tag_name):
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try:
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found = model.tag.get_tag_image(namespace_name, repo_name, tag_name, include_storage=True)
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except model.DataModelException:
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return None
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metadata = {}
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try:
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metadata = json.loads(found.v1_json_metadata)
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except ValueError:
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pass
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return ImageWithBlob(
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image_id=found.docker_image_id,
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blob=_blob(found.storage),
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repository=RepositoryReference(
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namespace_name=namespace_name,
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name=repo_name,
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id=found.repository_id,
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),
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compat_metadata=metadata,
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v1_metadata=_docker_v1_metadata(namespace_name, repo_name, found),
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internal_db_id=found.id,
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)
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pre_oci_model = PreOCIModel()
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def _docker_v1_metadata(namespace_name, repo_name, repo_image):
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"""
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Returns a DockerV1Metadata object for the given Pre-OCI repo_image under the
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repository with the given namespace and name. Note that the namespace and
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name are passed here as an optimization, and are *not checked* against the
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image.
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"""
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return DockerV1Metadata(
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namespace_name=namespace_name,
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repo_name=repo_name,
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image_id=repo_image.docker_image_id,
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checksum=repo_image.v1_checksum,
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compat_json=repo_image.v1_json_metadata,
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created=repo_image.created,
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comment=repo_image.comment,
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command=repo_image.command,
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# Note: These are not needed in verbs and are expensive to load, so we just skip them.
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content_checksum=None,
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parent_image_id=None,
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)
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def _derived_image(blob_record, repo_image):
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"""
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Returns a DerivedImage object for the given Pre-OCI data model blob and repo_image instance.
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"""
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return DerivedImage(
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ref=repo_image.internal_db_id,
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blob=_blob(blob_record),
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internal_source_image_db_id=repo_image.internal_db_id,
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)
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def _blob(blob_record):
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"""
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Returns a Blob object for the given Pre-OCI data model blob instance.
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"""
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if hasattr(blob_record, 'locations'):
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locations = blob_record.locations
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else:
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locations = model.storage.get_storage_locations(blob_record.uuid)
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return Blob(
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uuid=blob_record.uuid,
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size=blob_record.image_size,
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uncompressed_size=blob_record.uncompressed_size,
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uploading=blob_record.uploading,
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locations=locations,
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)
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def _repository_for_repo(repo):
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""" Returns a Repository object representing the Pre-OCI data model repo instance given. """
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return Repository(
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id=repo.id,
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name=repo.name,
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namespace_name=repo.namespace_user.username,
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description=repo.description,
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is_public=model.repository.is_repository_public(repo),
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kind=model.repository.get_repo_kind_name(repo),
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)
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