from abc import ABCMeta, abstractmethod
from six import add_metaclass

@add_metaclass(ABCMeta)
class RegistryDataInterface(object):
  """ Interface for code to work with the registry data model. The registry data model consists
      of all tables that store registry-specific information, such as Manifests, Blobs, Images,
      and Labels.
  """
  @abstractmethod
  def supports_schema2(self, namespace_name):
    """ Returns whether the implementation of the data interface supports schema 2 format
        manifests. """

  @abstractmethod
  def get_tag_legacy_image_id(self, repository_ref, tag_name, storage):
    """ Returns the legacy image ID for the tag with a legacy images in
        the repository. Returns None if None.
    """

  @abstractmethod
  def get_legacy_tags_map(self, repository_ref, storage):
    """ Returns a map from tag name to its legacy image ID, for all tags with legacy images in
        the repository. Note that this can be a *very* heavy operation.
    """

  @abstractmethod
  def find_matching_tag(self, repository_ref, tag_names):
    """ Finds an alive tag in the repository matching one of the given tag names and returns it
        or None if none.
    """

  @abstractmethod
  def get_most_recent_tag(self, repository_ref):
    """ Returns the most recently pushed alive tag in the repository, if any. If none, returns
        None.
    """

  @abstractmethod
  def lookup_repository(self, namespace_name, repo_name, kind_filter=None):
    """ Looks up and returns a reference to the repository with the given namespace and name,
        or None if none. """

  @abstractmethod
  def get_manifest_for_tag(self, tag, backfill_if_necessary=False, include_legacy_image=False):
    """ Returns the manifest associated with the given tag. """

  @abstractmethod
  def lookup_manifest_by_digest(self, repository_ref, manifest_digest, allow_dead=False,
                                include_legacy_image=False):
    """ Looks up the manifest with the given digest under the given repository and returns it
        or None if none. """

  @abstractmethod
  def create_manifest_and_retarget_tag(self, repository_ref, manifest_interface_instance, tag_name,
                                       storage):
    """ Creates a manifest in a repository, adding all of the necessary data in the model.

        The `manifest_interface_instance` parameter must be an instance of the manifest
        interface as returned by the image/docker package.

        Note that all blobs referenced by the manifest must exist under the repository or this
        method will fail and return None.

        Returns a reference to the (created manifest, tag) or (None, None) on error.
    """

  @abstractmethod
  def get_legacy_images(self, repository_ref):
    """
    Returns an iterator of all the LegacyImage's defined in the matching repository.
    """

  @abstractmethod
  def get_legacy_image(self, repository_ref, docker_image_id, include_parents=False,
                       include_blob=False):
    """
    Returns the matching LegacyImages under the matching repository, if any. If none,
    returns None.
    """

  @abstractmethod
  def create_manifest_label(self, manifest, key, value, source_type_name, media_type_name=None):
    """ Creates a label on the manifest with the given key and value.

        Can raise InvalidLabelKeyException or InvalidMediaTypeException depending
        on the validation errors.
    """

  @abstractmethod
  def batch_create_manifest_labels(self, manifest):
    """ Returns a context manager for batch creation of labels on a manifest.

        Can raise InvalidLabelKeyException or InvalidMediaTypeException depending
        on the validation errors.
    """

  @abstractmethod
  def list_manifest_labels(self, manifest, key_prefix=None):
    """ Returns all labels found on the manifest. If specified, the key_prefix will filter the
        labels returned to those keys that start with the given prefix.
    """

  @abstractmethod
  def get_manifest_label(self, manifest, label_uuid):
    """ Returns the label with the specified UUID on the manifest or None if none. """

  @abstractmethod
  def delete_manifest_label(self, manifest, label_uuid):
    """ Delete the label with the specified UUID on the manifest. Returns the label deleted
        or None if none.
    """

  @abstractmethod
  def lookup_active_repository_tags(self, repository_ref, start_pagination_id, limit):
    """
    Returns a page of actvie tags in a repository. Note that the tags returned by this method
    are ShallowTag objects, which only contain the tag name.
    """

  @abstractmethod
  def list_all_active_repository_tags(self, repository_ref, include_legacy_images=False):
    """
    Returns a list of all the active tags in the repository. Note that this is a *HEAVY*
    operation on repositories with a lot of tags, and should only be used for testing or
    where other more specific operations are not possible.
    """

  @abstractmethod
  def list_repository_tag_history(self, repository_ref, page=1, size=100, specific_tag_name=None,
                                  active_tags_only=False):
    """
    Returns the history of all tags in the repository (unless filtered). This includes tags that
    have been made in-active due to newer versions of those tags coming into service.
    """

  @abstractmethod
  def get_repo_tag(self, repository_ref, tag_name, include_legacy_image=False):
    """
    Returns the latest, *active* tag found in the repository, with the matching name
    or None if none.
    """

  @abstractmethod
  def has_expired_tag(self, repository_ref, tag_name):
    """
    Returns true if and only if the repository contains a tag with the given name that is expired.
    """

  @abstractmethod
  def retarget_tag(self, repository_ref, tag_name, manifest_or_legacy_image,
                   storage, is_reversion=False):
    """
    Creates, updates or moves a tag to a new entry in history, pointing to the manifest or
    legacy image specified. If is_reversion is set to True, this operation is considered a
    reversion over a previous tag move operation. Returns the updated Tag or None on error.
    """

  @abstractmethod
  def delete_tag(self, repository_ref, tag_name):
    """
    Deletes the latest, *active* tag with the given name in the repository.
    """

  @abstractmethod
  def delete_tags_for_manifest(self, manifest):
    """
    Deletes all tags pointing to the given manifest, making the manifest inaccessible for pulling.
    Returns the tags deleted, if any. Returns None on error.
    """

  @abstractmethod
  def change_repository_tag_expiration(self, tag, expiration_date):
    """ Sets the expiration date of the tag under the matching repository to that given. If the
        expiration date is None, then the tag will not expire. Returns a tuple of the previous
        expiration timestamp in seconds (if any), and whether the operation succeeded.
    """

  @abstractmethod
  def get_legacy_images_owned_by_tag(self, tag):
    """ Returns all legacy images *solely owned and used* by the given tag. """

  @abstractmethod
  def get_security_status(self, manifest_or_legacy_image):
    """ Returns the security status for the given manifest or legacy image or None if none. """

  @abstractmethod
  def backfill_manifest_for_tag(self, tag):
    """ Backfills a manifest for the V1 tag specified.
        If a manifest already exists for the tag, returns that manifest.

        NOTE: This method will only be necessary until we've completed the backfill, at which point
        it should be removed.
    """

  @abstractmethod
  def is_existing_disabled_namespace(self, namespace_name):
    """ Returns whether the given namespace exists and is disabled. """

  @abstractmethod
  def is_namespace_enabled(self, namespace_name):
    """ Returns whether the given namespace exists and is enabled. """

  @abstractmethod
  def get_manifest_local_blobs(self, manifest, include_placements=False):
    """ Returns the set of local blobs for the given manifest or None if none. """

  @abstractmethod
  def list_manifest_layers(self, manifest, storage, include_placements=False):
    """ Returns an *ordered list* of the layers found in the manifest, starting at the base
        and working towards the leaf, including the associated Blob and its placements
        (if specified). The layer information in `layer_info` will be of type
        `image.docker.types.ManifestImageLayer`. Should not be called for a manifest list.
    """

  @abstractmethod
  def list_parsed_manifest_layers(self, repository_ref, parsed_manifest, storage,
                                  include_placements=False):
    """ Returns an *ordered list* of the layers found in the parsed manifest, starting at the base
        and working towards the leaf, including the associated Blob and its placements
        (if specified). The layer information in `layer_info` will be of type
        `image.docker.types.ManifestImageLayer`. Should not be called for a manifest list.
    """

  @abstractmethod
  def lookup_derived_image(self, manifest, verb, varying_metadata=None, include_placements=False):
    """
    Looks up the derived image for the given manifest, verb and optional varying metadata and
    returns it or None if none.
    """

  @abstractmethod
  def lookup_or_create_derived_image(self, manifest, verb, storage_location, storage,
                                     varying_metadata=None, include_placements=False):
    """
    Looks up the derived image for the given maniest, verb and optional varying metadata
    and returns it. If none exists, a new derived image is created.
    """

  @abstractmethod
  def get_derived_image_signature(self, derived_image, signer_name):
    """
    Returns the signature associated with the derived image and a specific signer or None if none.
    """

  @abstractmethod
  def set_derived_image_signature(self, derived_image, signer_name, signature):
    """
    Sets the calculated signature for the given derived image and signer to that specified.
    """

  @abstractmethod
  def delete_derived_image(self, derived_image):
    """
    Deletes a derived image and all of its storage.
    """

  @abstractmethod
  def set_derived_image_size(self, derived_image, compressed_size):
    """
    Sets the compressed size on the given derived image.
    """

  @abstractmethod
  def get_torrent_info(self, blob):
    """
    Returns the torrent information associated with the given blob or None if none.
    """

  @abstractmethod
  def set_torrent_info(self, blob, piece_length, pieces):
    """
    Sets the torrent infomation associated with the given blob to that specified.
    """

  @abstractmethod
  def get_repo_blob_by_digest(self, repository_ref, blob_digest, include_placements=False):
    """
    Returns the blob in the repository with the given digest, if any or None if none. Note that
    there may be multiple records in the same repository for the same blob digest, so the return
    value of this function may change.
    """

  @abstractmethod
  def create_blob_upload(self, repository_ref, upload_id, location_name, storage_metadata):
    """ Creates a new blob upload and returns a reference. If the blob upload could not be
        created, returns None. """

  @abstractmethod
  def lookup_blob_upload(self, repository_ref, blob_upload_id):
    """ Looks up the blob upload with the given ID under the specified repository and returns it
        or None if none.
    """

  @abstractmethod
  def update_blob_upload(self, blob_upload, uncompressed_byte_count, piece_hashes, piece_sha_state,
                         storage_metadata, byte_count, chunk_count, sha_state):
    """ Updates the fields of the blob upload to match those given. Returns the updated blob upload
        or None if the record does not exists.
    """

  @abstractmethod
  def delete_blob_upload(self, blob_upload):
    """ Deletes a blob upload record. """

  @abstractmethod
  def commit_blob_upload(self, blob_upload, blob_digest_str, blob_expiration_seconds):
    """ Commits the blob upload into a blob and sets an expiration before that blob will be GCed.
    """

  @abstractmethod
  def mount_blob_into_repository(self, blob, target_repository_ref, expiration_sec):
    """
    Mounts the blob from another repository into the specified target repository, and adds an
    expiration before that blob is automatically GCed. This function is useful during push
    operations if an existing blob from another repository is being pushed. Returns False if
    the mounting fails. Note that this function does *not* check security for mounting the blob
    and the caller is responsible for doing this check (an example can be found in
    endpoints/v2/blob.py).
    """

  @abstractmethod
  def set_tags_expiration_for_manifest(self, manifest, expiration_sec):
    """
    Sets the expiration on all tags that point to the given manifest to that specified.
    """

  @abstractmethod
  def get_schema1_parsed_manifest(self, manifest, namespace_name, repo_name, tag_name, storage):
    """ Returns the schema 1 version of this manifest, or None if none. """

  @abstractmethod
  def create_manifest_with_temp_tag(self, repository_ref, manifest_interface_instance,
                                    expiration_sec, storage):
    """ Creates a manifest under the repository and sets a temporary tag to point to it.
        Returns the manifest object created or None on error.
    """

  @abstractmethod
  def get_cached_namespace_region_blacklist(self, model_cache, namespace_name):
    """ Returns a cached set of ISO country codes blacklisted for pulls for the namespace
        or None if the list could not be loaded.
    """

  @abstractmethod
  def convert_manifest(self, manifest, namespace_name, repo_name, tag_name, allowed_mediatypes,
                       storage):
    """ Attempts to convert the specified into a parsed manifest with a media type
        in the allowed_mediatypes set. If not possible, or an error occurs, returns None.
    """