didclient.py

# -*- coding: utf-8 -*-
# Copyright European Organization for Nuclear Research (CERN) since 2012
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

from datetime import datetime
from json import dumps
from typing import Any, Optional
from urllib.parse import quote_plus

from requests.status_codes import codes

from rucio.client.baseclient import BaseClient, choice
from rucio.common.exception import DeprecationError
from rucio.common.utils import build_url, date_to_str, render_json, render_json_list


class DIDClient(BaseClient):

    """DataIdentifier client class for working with data identifiers"""

    DIDS_BASEURL = 'dids'
    ARCHIVES_BASEURL = 'archives'

    def list_dids(self, scope, filters, did_type='collection', long=False, recursive=False):
        """
        List all data identifiers in a scope which match a given pattern.

        :param scope: The scope name.
        :param filters: A nested dictionary of key/value pairs like [{'key1': 'value1', 'key2.lte': 'value2'}, {'key3.gte, 'value3'}].
                        Keypairs in the same dictionary are AND'ed together, dictionaries are OR'ed together. Keys should be suffixed
                        like <key>.<operation>, e.g. key1 >= value1 is equivalent to {'key1.gte': value}, where <operation> belongs to one
                        of the set {'lte', 'gte', 'gt', 'lt', 'ne' or ''}. Equivalence doesn't require an operator.
        :param did_type: The type of the did: 'all'(container, dataset or file)|'collection'(dataset or container)|'dataset'|'container'|'file'
        :param long: Long format option to display more information for each DID.
        :param recursive: Recursively list DIDs content.
        """
        path = '/'.join([self.DIDS_BASEURL, quote_plus(scope), 'dids', 'search'])

        # stringify dates.
        if isinstance(filters, dict):   # backwards compatability for filters as single {}
            filters = [filters]
        for or_group in filters:
            for key, value in or_group.items():
                if isinstance(value, datetime):
                    or_group[key] = date_to_str(value)

        payload = {
            'type': did_type,
            'filters': filters,
            'long': long,
            'recursive': recursive
        }

        url = build_url(choice(self.list_hosts), path=path, params=payload)

        r = self._send_request(url, type_='GET')

        if r.status_code == codes.ok:
            dids = self._load_json_data(r)
            return dids
        else:
            exc_cls, exc_msg = self._get_exception(headers=r.headers, status_code=r.status_code, data=r.content)
            raise exc_cls(exc_msg)

    def list_dids_extended(self, scope, filters, did_type='collection', long=False, recursive=False):
        """
        List all data identifiers in a scope which match a given pattern (DEPRECATED)
        """
        raise DeprecationError("Command or function has been deprecated. Please use list_dids instead.")

    def add_did(self, scope, name, did_type, statuses=None, meta=None, rules=None, lifetime=None, dids=None, rse=None):
        """
        Add data identifier for a dataset or container.

        :param scope: The scope name.
        :param name: The data identifier name.
        :param did_type: The data identifier type (file|dataset|container).
        :param statuses: Dictionary with statuses, e.g.g {'monotonic':True}.
        :param meta: Meta-data associated with the data identifier is represented using key/value pairs in a dictionary.
        :param rules: Replication rules associated with the data identifier. A list of dictionaries, e.g., [{'copies': 2, 'rse_expression': 'TIERS1'}, ].
        :param lifetime: DID's lifetime (in seconds).
        :param dids: The content.
        :param rse: The RSE name when registering replicas.
        """
        path = '/'.join([self.DIDS_BASEURL, quote_plus(scope), quote_plus(name)])
        url = build_url(choice(self.list_hosts), path=path)
        # Build json
        data = {'type': did_type}
        if statuses:
            data['statuses'] = statuses
        if meta:
            data['meta'] = meta
        if rules:
            data['rules'] = rules
        if lifetime:
            data['lifetime'] = lifetime
        if dids:
            data['dids'] = dids
        if rse:
            data['rse'] = rse
        r = self._send_request(url, type_='POST', data=render_json(**data))
        if r.status_code == codes.created:
            return True
        else:
            exc_cls, exc_msg = self._get_exception(headers=r.headers, status_code=r.status_code, data=r.content)
            raise exc_cls(exc_msg)

    def add_dids(self, dids):
        """
        Bulk add datasets/containers.
        """
        path = '/'.join([self.DIDS_BASEURL])
        url = build_url(choice(self.list_hosts), path=path)
        r = self._send_request(url, type_='POST', data=render_json_list(dids))
        if r.status_code == codes.created:
            return True
        else:
            exc_cls, exc_msg = self._get_exception(headers=r.headers, status_code=r.status_code, data=r.content)
            raise exc_cls(exc_msg)

    def add_dataset(self, scope, name, statuses=None, meta=None, rules=None, lifetime=None, files=None, rse=None):
        """
        Add data identifier for a dataset.

        :param scope: The scope name.
        :param name: The data identifier name.
        :param statuses: Dictionary with statuses, e.g.g {'monotonic':True}.
        :param meta: Meta-data associated with the data identifier is represented using key/value pairs in a dictionary.
        :param rules: Replication rules associated with the data identifier. A list of dictionaries, e.g., [{'copies': 2, 'rse_expression': 'TIERS1'}, ].
        :param lifetime: DID's lifetime (in seconds).
        :param files: The content.
        :param rse: The RSE name when registering replicas.
        """
        return self.add_did(scope=scope, name=name, did_type='DATASET',
                            statuses=statuses, meta=meta, rules=rules,
                            lifetime=lifetime, dids=files, rse=rse)

    def add_datasets(self, dsns):
        """
        Bulk add datasets.

        :param dsns: A list of datasets.
        """
        return self.add_dids(dids=[dict(list(dsn.items()) + [('type', 'DATASET')]) for dsn in dsns])

    def add_container(self, scope, name, statuses=None, meta=None, rules=None, lifetime=None):
        """
        Add data identifier for a container.

        :param scope: The scope name.
        :param name: The data identifier name.
        :param statuses: Dictionary with statuses, e.g.g {'monotonic':True}.
        :param meta: Meta-data associated with the data identifier is represented using key/value pairs in a dictionary.
        :param rules: Replication rules associated with the data identifier. A list of dictionaries, e.g., [{'copies': 2, 'rse_expression': 'TIERS1'}, ].
        :param lifetime: DID's lifetime (in seconds).
        """
        return self.add_did(scope=scope, name=name, did_type='CONTAINER', statuses=statuses, meta=meta, rules=rules, lifetime=lifetime)

    def add_containers(self, cnts):
        """
        Bulk add containers.

        :param cnts: A list of containers.
        """
        return self.add_dids(dids=[dict(list(cnts.items()) + [('type', 'CONTAINER')]) for cnt in cnts])

    def attach_dids(self, scope, name, dids, rse=None):
        """
        Attach data identifier.

        :param scope: The scope name.
        :param name: The data identifier name.
        :param dids: The content.
        :param rse: The RSE name when registering replicas.
        """
        path = '/'.join([self.DIDS_BASEURL, quote_plus(scope), quote_plus(name), 'dids'])
        url = build_url(choice(self.list_hosts), path=path)
        data = {'dids': dids}
        if rse:
            data['rse'] = rse
        r = self._send_request(url, type_='POST', data=render_json(**data))
        if r.status_code == codes.created:
            return True
        else:
            exc_cls, exc_msg = self._get_exception(headers=r.headers, status_code=r.status_code, data=r.content)
            raise exc_cls(exc_msg)

    def detach_dids(self, scope, name, dids):
        """
        Detach data identifier

        :param scope: The scope name.
        :param name: The data identifier name.
        :param dids: The content.
        """

        path = '/'.join([self.DIDS_BASEURL, quote_plus(scope), quote_plus(name), 'dids'])
        url = build_url(choice(self.list_hosts), path=path)
        data = {'dids': dids}
        r = self._send_request(url, type_='DEL', data=render_json(**data))
        if r.status_code == codes.ok:
            return True
        exc_cls, exc_msg = self._get_exception(headers=r.headers, status_code=r.status_code, data=r.content)
        raise exc_cls(exc_msg)

    def attach_dids_to_dids(self, attachments, ignore_duplicate=False):
        """
        Add dids to dids.

        :param attachments: The attachments.
            attachments is: [attachment, attachment, ...]
            attachment is: {'scope': scope, 'name': name, 'dids': dids}
            dids is: [{'scope': scope, 'name': name}, ...]
        :param ignore_duplicate: If True, ignore duplicate entries.
        """
        path = '/'.join([self.DIDS_BASEURL, 'attachments'])
        url = build_url(choice(self.list_hosts), path=path)
        data = {'ignore_duplicate': ignore_duplicate, 'attachments': attachments}
        r = self._send_request(url, type_='POST', data=dumps(data))
        if r.status_code in (codes.ok, codes.no_content, codes.created):
            return True

        exc_cls, exc_msg = self._get_exception(headers=r.headers, status_code=r.status_code, data=r.content)
        raise exc_cls(exc_msg)

    def add_files_to_datasets(self, attachments, ignore_duplicate=False):
        """
        Add files to datasets.

        :param attachments: The attachments.
            attachments is: [attachment, attachment, ...]
            attachment is: {'scope': scope, 'name': name, 'dids': dids}
            dids is: [{'scope': scope, 'name': name}, ...]
        :param ignore_duplicate: If True, ignore duplicate entries.
        """
        return self.attach_dids_to_dids(attachments=attachments,
                                        ignore_duplicate=ignore_duplicate)

    def add_datasets_to_containers(self, attachments):
        """
        Add datasets_to_containers.

        :param attachments: The attachments.
            attachments is: [attachment, attachment, ...]
            attachment is: {'scope': scope, 'name': name, 'dids': dids}
            dids is: [{'scope': scope, 'name': name}, ...]
        """
        return self.attach_dids_to_dids(attachments=attachments)

    def add_containers_to_containers(self, attachments):
        """
        Add containers_to_containers.

        :param attachments: The attachments.
            attachments is: [attachment, attachment, ...]
            attachment is: {'scope': scope, 'name': name, 'dids': dids}
            dids is: [{'scope': scope, 'name': name}, ...]
        """
        return self.attach_dids_to_dids(attachments=attachments)

    def add_files_to_dataset(self, scope, name, files, rse=None):
        """
        Add files to datasets.

        :param scope: The scope name.
        :param name: The dataset name.
        :param files: The content.
        :param rse: The RSE name when registering replicas.
        """
        return self.attach_dids(scope=scope, name=name, dids=files, rse=rse)

    def add_files_to_archive(self, scope, name, files):
        """
        Add files to archive.

        :param scope: The scope name.
        :param name: The dataset name.
        :param files: The content.
        """
        return self.attach_dids(scope=scope, name=name, dids=files)

    def add_datasets_to_container(self, scope, name, dsns):
        """
        Add datasets to container.

        :param scope: The scope name.
        :param name: The dataset name.
        :param dsns: The content.
        """
        return self.attach_dids(scope=scope, name=name, dids=dsns)

    def add_containers_to_container(self, scope, name, cnts):
        """
        Add containers to container.

        :param scope: The scope name.
        :param name: The dataset name.
        :param cnts: The content.
        """
        return self.attach_dids(scope=scope, name=name, dids=cnts)

    def list_content(self, scope, name):
        """
        List data identifier contents.

        :param scope: The scope name.
        :param name: The data identifier name.
        """

        path = '/'.join([self.DIDS_BASEURL, quote_plus(scope), quote_plus(name), 'dids'])
        url = build_url(choice(self.list_hosts), path=path)
        r = self._send_request(url, type_='GET')
        if r.status_code == codes.ok:
            return self._load_json_data(r)
        exc_cls, exc_msg = self._get_exception(headers=r.headers, status_code=r.status_code, data=r.content)
        raise exc_cls(exc_msg)

    def list_content_history(self, scope, name):
        """
        List data identifier contents history.

        :param scope: The scope name.
        :param name: The data identifier name.
        """

        path = '/'.join([self.DIDS_BASEURL, quote_plus(scope), quote_plus(name), 'dids', 'history'])
        url = build_url(choice(self.list_hosts), path=path)
        r = self._send_request(url, type_='GET')
        if r.status_code == codes.ok:
            return self._load_json_data(r)
        exc_cls, exc_msg = self._get_exception(headers=r.headers, status_code=r.status_code, data=r.content)
        raise exc_cls(exc_msg)

    def list_files(self, scope: str, name: str, long: Optional[bool] = None):
        """
        List data identifier file contents.

        :param scope: The scope name.
        :param name: The data identifier name.
        :param long: A boolean to choose if GUID is returned or not.
        """

        payload = {}
        path = '/'.join([self.DIDS_BASEURL, quote_plus(scope), quote_plus(name), 'files'])
        if long:
            payload['long'] = True
        url = build_url(choice(self.list_hosts), path=path, params=payload)

        r = self._send_request(url, type_='GET')
        if r.status_code == codes.ok:
            return self._load_json_data(r)
        else:
            exc_cls, exc_msg = self._get_exception(headers=r.headers, status_code=r.status_code, data=r.content)
            raise exc_cls(exc_msg)

    def bulk_list_files(self, dids: list[dict[str, Any]]):
        """
        List data identifier file contents.

        :param dids: The list of DIDs.
        """

        data = {'dids': dids}
        path = '/'.join([self.DIDS_BASEURL, 'bulkfiles'])
        url = build_url(choice(self.list_hosts), path=path)

        r = self._send_request(url, type_='POST', data=dumps(data), stream=True)
        if r.status_code == codes.ok:
            return self._load_json_data(r)
        else:
            exc_cls, exc_msg = self._get_exception(headers=r.headers, status_code=r.status_code, data=r.content)
            raise exc_cls(exc_msg)

    def get_did(self, scope, name, dynamic=False, dynamic_depth=None):
        """
        Retrieve a single data identifier.

        :param scope: The scope name.
        :param name: The data identifier name.
        :param dynamic_depth: The DID type as string ('FILE'/'DATASET') at which to stop the dynamic
        length/bytes calculation. If not set, the size will not be computed dynamically.
        :param dynamic: (Deprecated) same as dynamic_depth = 'FILE'
        """

        path = '/'.join([self.DIDS_BASEURL, quote_plus(scope), quote_plus(name)])
        params = {}
        if dynamic_depth:
            params['dynamic_depth'] = dynamic_depth
        elif dynamic:
            params['dynamic_depth'] = 'FILE'
        url = build_url(choice(self.list_hosts), path=path, params=params)
        r = self._send_request(url, type_='GET')
        if r.status_code == codes.ok:
            return next(self._load_json_data(r))
        else:
            exc_cls, exc_msg = self._get_exception(headers=r.headers, status_code=r.status_code, data=r.content)
            raise exc_cls(exc_msg)

    def get_metadata(self, scope, name, plugin='DID_COLUMN'):
        """
        Get data identifier metadata

        :param scope: The scope name.
        :param name: The data identifier name.
        :param plugin: Backend Metadata plugin the Rucio server should use to query data.
        """
        path = '/'.join([self.DIDS_BASEURL, quote_plus(scope), quote_plus(name), 'meta'])
        url = build_url(choice(self.list_hosts), path=path)
        payload = {}
        payload['plugin'] = plugin
        r = self._send_request(url, type_='GET', params=payload)
        if r.status_code == codes.ok:
            meta = self._load_json_data(r)
            return next(meta)
        else:
            exc_cls, exc_msg = self._get_exception(headers=r.headers, status_code=r.status_code, data=r.content)
            raise exc_cls(exc_msg)

    def get_metadata_bulk(self, dids, inherit=False):
        """
        Bulk get data identifier metadata
        :param inherit:            A boolean. If set to true, the metadata of the parent are concatenated.
        :param dids:               A list of dids.
        """
        data = {'dids': dids, 'inherit': inherit}
        path = '/'.join([self.DIDS_BASEURL, 'bulkmeta'])
        url = build_url(choice(self.list_hosts), path=path)
        r = self._send_request(url, type_='POST', data=dumps(data))
        if r.status_code == codes.ok:
            return self._load_json_data(r)
        exc_cls, exc_msg = self._get_exception(headers=r.headers, status_code=r.status_code, data=r.content)
        raise exc_cls(exc_msg)

    def set_metadata(self, scope, name, key, value, recursive=False):
        """
        Set data identifier metadata

        :param scope: The scope name.
        :param name: The data identifier name.
        :param key: the key.
        :param value: the value.
        :param recursive: Option to propagate the metadata change to content.
        """
        path = '/'.join([self.DIDS_BASEURL, quote_plus(scope), quote_plus(name), 'meta', key])
        url = build_url(choice(self.list_hosts), path=path)
        data = dumps({'value': value, 'recursive': recursive})
        r = self._send_request(url, type_='POST', data=data)
        if r.status_code == codes.created:
            return True
        else:
            exc_cls, exc_msg = self._get_exception(headers=r.headers, status_code=r.status_code, data=r.content)
            raise exc_cls(exc_msg)

    def set_metadata_bulk(self, scope, name, meta, recursive=False):
        """
        Set data identifier metadata in bulk.

        :param scope: The scope name.
        :param name: The data identifier name.
        :param meta: the metadata key-values.
        :type meta: dict
        :param recursive: Option to propagate the metadata change to content.
        """
        path = '/'.join([self.DIDS_BASEURL, quote_plus(scope), quote_plus(name), 'meta'])
        url = build_url(choice(self.list_hosts), path=path)
        data = dumps({'meta': meta, 'recursive': recursive})
        r = self._send_request(url, type_='POST', data=data)
        if r.status_code == codes.created:
            return True
        else:
            exc_cls, exc_msg = self._get_exception(headers=r.headers, status_code=r.status_code, data=r.content)
            raise exc_cls(exc_msg)

    def set_dids_metadata_bulk(self, dids, recursive=False):
        """
        Set metadata to a list of data identifiers.

        :param dids: A list of dids including metadata, i.e. [['scope': scope1, 'name': name1, 'meta': {key1: value1, key2: value2}] .
        :param recursive: Option to propagate the metadata update to content.
        """
        path = '/'.join([self.DIDS_BASEURL, 'bulkdidsmeta'])
        url = build_url(choice(self.list_hosts), path=path)
        data = dumps({'dids': dids, 'recursive': recursive})
        r = self._send_request(url, type_='POST', data=data)
        if r.status_code == codes.created:
            return True
        else:
            exc_cls, exc_msg = self._get_exception(headers=r.headers, status_code=r.status_code, data=r.content)
            raise exc_cls(exc_msg)

    def set_status(self, scope, name, **kwargs):
        """
        Set data identifier status

        :param scope: The scope name.
        :param name: The data identifier name.
        :param kwargs:  Keyword arguments of the form status_name=value.
        """
        path = '/'.join([self.DIDS_BASEURL, quote_plus(scope), quote_plus(name), 'status'])
        url = build_url(choice(self.list_hosts), path=path)
        data = dumps(kwargs)
        r = self._send_request(url, type_='PUT', data=data)
        if r.status_code in (codes.ok, codes.no_content, codes.created):
            return True

        exc_cls, exc_msg = self._get_exception(headers=r.headers, status_code=r.status_code, data=r.content)
        raise exc_cls(exc_msg)

    def close(self, scope, name):
        """
        close dataset/container

        :param scope: The scope name.
        :param name: The dataset/container name.
        """
        return self.set_status(scope=scope, name=name, open=False)

    def delete_metadata(self, scope, name, key):
        """
        Delete data identifier metadata

        :param scope: The scope name.
        :param name: The data identifier.
        :param key: the key.
        """
        path = '/'.join([self.DIDS_BASEURL, quote_plus(scope), quote_plus(name), 'meta'])
        url = build_url(choice(self.list_hosts), path=path, params={'key': key})

        r = self._send_request(url, type_='DEL')
        if r.status_code == codes.ok:
            return True
        else:
            exc_cls, exc_msg = self._get_exception(headers=r.headers, status_code=r.status_code, data=r.content)
            raise exc_cls(exc_msg)

    def list_did_rules(self, scope, name):
        """
        List the associated rules of a data identifier.

        :param scope: The scope name.
        :param name: The data identifier name.
        """

        path = '/'.join([self.DIDS_BASEURL, quote_plus(scope), quote_plus(name), 'rules'])
        url = build_url(choice(self.list_hosts), path=path)
        r = self._send_request(url, type_='GET')
        if r.status_code == codes.ok:
            return self._load_json_data(r)
        else:
            exc_cls, exc_msg = self._get_exception(headers=r.headers, status_code=r.status_code, data=r.content)
            raise exc_cls(exc_msg)

    def list_associated_rules_for_file(self, scope, name):
        """
        List the associated rules a file is affected from..

        :param scope: The scope name.
        :param name:  The file name.
        """

        path = '/'.join([self.DIDS_BASEURL, quote_plus(scope), quote_plus(name), 'associated_rules'])
        url = build_url(choice(self.list_hosts), path=path)
        r = self._send_request(url, type_='GET')
        if r.status_code == codes.ok:
            return self._load_json_data(r)
        else:
            exc_cls, exc_msg = self._get_exception(headers=r.headers, status_code=r.status_code, data=r.content)
            raise exc_cls(exc_msg)

    def get_dataset_by_guid(self, guid):
        """
        Get the parent datasets for a given GUID.
        :param guid: The GUID.

        :returns: A did
        """

        path = '/'.join([self.DIDS_BASEURL, guid, 'guid'])
        url = build_url(choice(self.list_hosts), path=path)
        r = self._send_request(url, type_='GET')
        if r.status_code == codes.ok:
            return self._load_json_data(r)
        else:
            exc_cls, exc_msg = self._get_exception(headers=r.headers, status_code=r.status_code, data=r.content)
            raise exc_cls(exc_msg)

    def scope_list(self, scope, name=None, recursive=False):
        """
        List data identifiers in a scope.

        :param scope: The scope name.
        :param name: The data identifier name.
        :param recursive: boolean, True or False.
        """

        payload = {}
        path = '/'.join([self.DIDS_BASEURL, quote_plus(scope), ''])
        if name:
            payload['name'] = name
        if recursive:
            payload['recursive'] = True
        url = build_url(choice(self.list_hosts), path=path, params=payload)

        r = self._send_request(url, type_='GET')
        if r.status_code == codes.ok:
            return self._load_json_data(r)
        else:
            exc_cls, exc_msg = self._get_exception(headers=r.headers, status_code=r.status_code, data=r.content)
            raise exc_cls(exc_msg)

    def list_parent_dids(self, scope, name):
        """
        List parent dataset/containers of a did.

        :param scope: The scope.
        :param name:  The name.
        """

        path = '/'.join([self.DIDS_BASEURL, quote_plus(scope), quote_plus(name), 'parents'])
        url = build_url(choice(self.list_hosts), path=path)

        r = self._send_request(url, type_='GET')
        if r.status_code == codes.ok:
            return self._load_json_data(r)
        else:
            exc_cls, exc_msg = self._get_exception(headers=r.headers, status_code=r.status_code, data=r.content)
            raise exc_cls(exc_msg)

    def create_did_sample(self, input_scope, input_name, output_scope, output_name, nbfiles):
        """
        Create a sample from an input collection.

        :param input_scope: The scope of the input DID.
        :param input_name: The name of the input DID.
        :param output_scope: The scope of the output dataset.
        :param output_name: The name of the output dataset.
        :param account: The account.
        :param nbfiles: The number of files to register in the output dataset.
        """
        path = '/'.join([self.DIDS_BASEURL, 'sample'])
        data = dumps({
            'input_scope': input_scope,
            'input_name': input_name,
            'output_scope': output_scope,
            'output_name': output_name,
            'nbfiles': str(nbfiles)
        })
        url = build_url(choice(self.list_hosts), path=path)
        r = self._send_request(url, type_='POST', data=data)
        if r.status_code == codes.created:
            return True
        else:
            exc_cls, exc_msg = self._get_exception(headers=r.headers, status_code=r.status_code, data=r.content)
            raise exc_cls(exc_msg)

    def resurrect(self, dids):
        """
        Resurrect a list of dids.

        :param dids:  A list of dids [{'scope': scope, 'name': name}, ...]
        """
        path = '/'.join([self.DIDS_BASEURL, 'resurrect'])
        url = build_url(choice(self.list_hosts), path=path)
        r = self._send_request(url, type_='POST', data=dumps(dids))
        if r.status_code == codes.created:
            return True
        else:
            exc_cls, exc_msg = self._get_exception(headers=r.headers, status_code=r.status_code, data=r.content)
            raise exc_cls(exc_msg)

    def list_archive_content(self, scope, name):
        """
        List archive contents.

        :param scope: The scope name.
        :param name: The data identifier name.
        """
        path = '/'.join([self.ARCHIVES_BASEURL, quote_plus(scope), quote_plus(name), 'files'])
        url = build_url(choice(self.list_hosts), path=path)

        r = self._send_request(url, type_='GET')
        if r.status_code == codes.ok:
            return self._load_json_data(r)
        exc_cls, exc_msg = self._get_exception(headers=r.headers, status_code=r.status_code, data=r.content)
        raise exc_cls(exc_msg)