405 lines
15 KiB
Python
405 lines
15 KiB
Python
import logging
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import json
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import hashlib
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from flask import redirect, Blueprint, abort, send_file, make_response, request
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import features
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from app import app, signer, storage, metric_queue
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from auth.auth import process_auth
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from auth.auth_context import get_authenticated_user
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from auth.permissions import ReadRepositoryPermission
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from data import model, database
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from endpoints.trackhelper import track_and_log
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from endpoints.decorators import anon_protect
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from util.registry.queuefile import QueueFile
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from util.registry.queueprocess import QueueProcess
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from util.registry.torrent import (make_torrent, per_user_torrent_filename, public_torrent_filename,
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PieceHasher)
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from util.registry.filelike import wrap_with_handler
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from formats.squashed import SquashedDockerImage
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from formats.aci import ACIImage
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from storage import Storage
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from endpoints.v2.blob import BLOB_DIGEST_ROUTE
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from endpoints.common import route_show_if, parse_repository_name
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verbs = Blueprint('verbs', __name__)
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logger = logging.getLogger(__name__)
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def _open_stream(formatter, namespace, repository, tag, synthetic_image_id, image_json, repo_image,
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handlers):
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""" This method generates a stream of data which will be replicated and read from the queue files.
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This method runs in a separate process.
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"""
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# For performance reasons, we load the full image list here, cache it, then disconnect from
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# the database.
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with database.UseThenDisconnect(app.config):
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image_list = list(model.image.get_parent_images_with_placements(namespace, repository,
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repo_image))
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image_list.insert(0, repo_image)
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def get_image_json(image):
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return json.loads(image.v1_json_metadata)
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def get_next_image():
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for current_image in image_list:
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yield current_image
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def get_next_layer():
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# Re-Initialize the storage engine because some may not respond well to forking (e.g. S3)
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store = Storage(app, metric_queue)
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for current_image_entry in image_list:
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current_image_path = model.storage.get_layer_path(current_image_entry.storage)
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current_image_stream = store.stream_read_file(current_image_entry.storage.locations,
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current_image_path)
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current_image_id = current_image_entry.id
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logger.debug('Returning image layer %s (%s): %s', current_image_id,
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current_image_entry.docker_image_id, current_image_path)
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yield current_image_stream
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stream = formatter.build_stream(namespace, repository, tag, synthetic_image_id, image_json,
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get_next_image, get_next_layer, get_image_json)
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for handler_fn in handlers:
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stream = wrap_with_handler(stream, handler_fn)
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return stream.read
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def _sign_synthetic_image(verb, linked_storage_uuid, queue_file):
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""" Read from the queue file and sign the contents which are generated. This method runs in a
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separate process. """
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signature = None
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try:
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signature = signer.detached_sign(queue_file)
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except:
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logger.exception('Exception when signing %s image %s', verb, linked_storage_uuid)
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return
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# Setup the database (since this is a new process) and then disconnect immediately
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# once the operation completes.
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if not queue_file.raised_exception:
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with database.UseThenDisconnect(app.config):
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try:
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derived = model.storage.get_storage_by_uuid(linked_storage_uuid)
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except model.storage.InvalidImageException:
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return
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signature_entry = model.storage.find_or_create_storage_signature(derived, 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 _write_synthetic_image_to_storage(verb, linked_storage_uuid, linked_locations, queue_file):
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""" Read from the generated stream and write it back to the storage engine. This method runs in a
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separate process.
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"""
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def handle_exception(ex):
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logger.debug('Exception when building %s image %s: %s', verb, linked_storage_uuid, ex)
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with database.UseThenDisconnect(app.config):
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model.image.delete_derived_storage_by_uuid(linked_storage_uuid)
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queue_file.add_exception_handler(handle_exception)
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# Re-Initialize the storage engine because some may not respond well to forking (e.g. S3)
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store = Storage(app, metric_queue)
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image_path = store.v1_image_layer_path(linked_storage_uuid)
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store.stream_write(linked_locations, image_path, queue_file)
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queue_file.close()
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if not queue_file.raised_exception:
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# Setup the database (since this is a new process) and then disconnect immediately
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# once the operation completes.
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with database.UseThenDisconnect(app.config):
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done_uploading = model.storage.get_storage_by_uuid(linked_storage_uuid)
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done_uploading.uploading = False
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done_uploading.save()
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def _torrent_for_storage(storage_ref, is_public):
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""" Returns a response containing the torrent file contents for the given storage. May abort
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with an error if the state is not valid (e.g. non-public, non-user request).
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"""
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# Make sure the storage has a size.
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if not storage_ref.image_size:
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abort(404)
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# Lookup the torrent information for the storage.
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try:
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torrent_info = model.storage.get_torrent_info(storage_ref)
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except model.TorrentInfoDoesNotExist:
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abort(404)
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# Lookup the webseed path for the storage.
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path = model.storage.get_layer_path(storage_ref)
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webseed = storage.get_direct_download_url(storage_ref.locations, path,
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expires_in=app.config['BITTORRENT_WEBSEED_LIFETIME'])
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if webseed is None:
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# We cannot support webseeds for storages that cannot provide direct downloads.
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abort(make_response('Storage engine does not support seeding.', 501))
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# Build the filename for the torrent.
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if is_public:
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name = public_torrent_filename(storage_ref.uuid)
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else:
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user = get_authenticated_user()
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if not user:
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abort(403)
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name = per_user_torrent_filename(user.uuid, storage_ref.uuid)
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# Return the torrent file.
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torrent_file = make_torrent(name, webseed, storage_ref.image_size,
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torrent_info.piece_length, torrent_info.pieces)
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headers = {'Content-Type': 'application/x-bittorrent',
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'Content-Disposition': 'attachment; filename={0}.torrent'.format(name)}
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return make_response(torrent_file, 200, headers)
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def _torrent_repo_verb(repo_image, tag, verb, **kwargs):
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""" Handles returning a torrent for the given verb on the given image and tag. """
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if not features.BITTORRENT:
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# Torrent feature is not enabled.
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abort(406)
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# Lookup an *existing* derived storage for the verb. If the verb's image storage doesn't exist,
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# we cannot create it here, so we 406.
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derived = model.image.find_derived_storage_for_image(repo_image, verb,
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varying_metadata={'tag': tag})
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if not derived:
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abort(406)
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# Return the torrent.
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public_repo = model.repository.is_repository_public(repo_image.repository)
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torrent = _torrent_for_storage(derived, public_repo)
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# Log the action.
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track_and_log('repo_verb', repo_image.repository, tag=tag, verb=verb, torrent=True, **kwargs)
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return torrent
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def _verify_repo_verb(store, namespace, repository, tag, verb, checker=None):
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permission = ReadRepositoryPermission(namespace, repository)
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if not permission.can() and not model.repository.repository_is_public(namespace, repository):
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abort(403)
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# Lookup the requested tag.
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try:
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tag_image = model.tag.get_tag_image(namespace, repository, tag)
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except model.DataModelException:
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abort(404)
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# Lookup the tag's image and storage.
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repo_image = model.image.get_repo_image_extended(namespace, repository, tag_image.docker_image_id)
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if not repo_image:
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abort(404)
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# If there is a data checker, call it first.
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image_json = None
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if checker is not None:
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image_json = json.loads(repo_image.v1_json_metadata)
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if not checker(image_json):
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logger.debug('Check mismatch on %s/%s:%s, verb %s', namespace, repository, tag, verb)
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abort(404)
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return (repo_image, tag_image, image_json)
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def _repo_verb_signature(namespace, repository, tag, verb, checker=None, **kwargs):
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# Verify that the image exists and that we have access to it.
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result = _verify_repo_verb(storage, namespace, repository, tag, verb, checker)
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(repo_image, _, _) = result
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# Lookup the derived image storage for the verb.
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derived = model.image.find_derived_storage_for_image(repo_image, verb,
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varying_metadata={'tag': tag})
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if derived is None or derived.uploading:
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return make_response('', 202)
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# Check if we have a valid signer configured.
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if not signer.name:
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abort(404)
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# Lookup the signature for the verb.
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signature_entry = model.storage.lookup_storage_signature(derived, signer.name)
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if signature_entry is None:
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abort(404)
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# Return the signature.
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return make_response(signature_entry.signature)
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def _repo_verb(namespace, repository, tag, verb, formatter, sign=False, checker=None, **kwargs):
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# Verify that the image exists and that we have access to it.
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result = _verify_repo_verb(storage, namespace, repository, tag, verb, checker)
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(repo_image, tag_image, image_json) = result
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# Check for torrent. If found, we return a torrent for the repo verb image (if the derived
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# image already exists).
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if request.accept_mimetypes.best == 'application/x-bittorrent':
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return _torrent_repo_verb(repo_image, tag, verb, **kwargs)
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# Log the action.
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track_and_log('repo_verb', repo_image.repository, tag=tag, verb=verb, **kwargs)
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# Lookup/create the derived image storage for the verb and repo image.
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derived = model.image.find_or_create_derived_storage(repo_image, verb,
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storage.preferred_locations[0],
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varying_metadata={'tag': tag})
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if not derived.uploading:
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logger.debug('Derived %s image %s exists in storage', verb, derived.uuid)
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derived_layer_path = model.storage.get_layer_path(derived)
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is_head_request = request.method == 'HEAD'
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download_url = storage.get_direct_download_url(derived.locations, derived_layer_path,
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head=is_head_request)
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if download_url:
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logger.debug('Redirecting to download URL for derived %s image %s', verb, derived.uuid)
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return redirect(download_url)
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# Close the database handle here for this process before we send the long download.
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database.close_db_filter(None)
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logger.debug('Sending cached derived %s image %s', verb, derived.uuid)
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return send_file(storage.stream_read_file(derived.locations, derived_layer_path))
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logger.debug('Building and returning derived %s image %s', verb, derived.uuid)
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# Load the image's JSON layer.
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if not image_json:
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image_json = json.loads(repo_image.v1_json_metadata)
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# Calculate a synthetic image ID.
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synthetic_image_id = hashlib.sha256(tag_image.docker_image_id + ':' + verb).hexdigest()
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def _cleanup():
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# Close any existing DB connection once the process has exited.
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database.close_db_filter(None)
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hasher = PieceHasher(app.config['BITTORRENT_PIECE_SIZE'])
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def _store_metadata_and_cleanup():
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with database.UseThenDisconnect(app.config):
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model.storage.save_torrent_info(derived, app.config['BITTORRENT_PIECE_SIZE'],
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hasher.final_piece_hashes())
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derived.image_size = hasher.hashed_bytes
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derived.save()
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# Create a queue process to generate the data. The queue files will read from the process
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# and send the results to the client and storage.
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handlers = [hasher.update]
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args = (formatter, namespace, repository, tag, synthetic_image_id, image_json, repo_image,
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handlers)
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queue_process = QueueProcess(_open_stream,
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8 * 1024, 10 * 1024 * 1024, # 8K/10M chunk/max
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args, finished=_store_metadata_and_cleanup)
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client_queue_file = QueueFile(queue_process.create_queue(), 'client')
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storage_queue_file = QueueFile(queue_process.create_queue(), 'storage')
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# If signing is required, add a QueueFile for signing the image as we stream it out.
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signing_queue_file = None
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if sign and signer.name:
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signing_queue_file = QueueFile(queue_process.create_queue(), 'signing')
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# Start building.
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queue_process.run()
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# Start the storage saving.
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storage_args = (verb, derived.uuid, derived.locations, storage_queue_file)
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QueueProcess.run_process(_write_synthetic_image_to_storage, storage_args, finished=_cleanup)
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if sign and signer.name:
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signing_args = (verb, derived.uuid, signing_queue_file)
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QueueProcess.run_process(_sign_synthetic_image, signing_args, finished=_cleanup)
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# Close the database handle here for this process before we send the long download.
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database.close_db_filter(None)
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# Return the client's data.
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return send_file(client_queue_file)
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def os_arch_checker(os, arch):
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def checker(image_json):
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# Verify the architecture and os.
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operating_system = image_json.get('os', 'linux')
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if operating_system != os:
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return False
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architecture = image_json.get('architecture', 'amd64')
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# Note: Some older Docker images have 'x86_64' rather than 'amd64'.
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# We allow the conversion here.
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if architecture == 'x86_64' and operating_system == 'linux':
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architecture = 'amd64'
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if architecture != arch:
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return False
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return True
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return checker
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@route_show_if(features.ACI_CONVERSION)
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@anon_protect
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@verbs.route('/aci/<server>/<namespace>/<repository>/<tag>/sig/<os>/<arch>/', methods=['GET'])
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@verbs.route('/aci/<server>/<namespace>/<repository>/<tag>/aci.asc/<os>/<arch>/', methods=['GET'])
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@process_auth
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def get_aci_signature(server, namespace, repository, tag, os, arch):
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return _repo_verb_signature(namespace, repository, tag, 'aci', checker=os_arch_checker(os, arch),
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os=os, arch=arch)
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@route_show_if(features.ACI_CONVERSION)
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@anon_protect
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@verbs.route('/aci/<server>/<namespace>/<repository>/<tag>/aci/<os>/<arch>/', methods=['GET', 'HEAD'])
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@process_auth
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def get_aci_image(server, namespace, repository, tag, os, arch):
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return _repo_verb(namespace, repository, tag, 'aci', ACIImage(),
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sign=True, checker=os_arch_checker(os, arch), os=os, arch=arch)
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@anon_protect
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@verbs.route('/squash/<namespace>/<repository>/<tag>', methods=['GET'])
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@process_auth
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def get_squashed_tag(namespace, repository, tag):
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return _repo_verb(namespace, repository, tag, 'squash', SquashedDockerImage())
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@route_show_if(features.BITTORRENT)
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@anon_protect
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@verbs.route('/torrent{0}'.format(BLOB_DIGEST_ROUTE), methods=['GET'])
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@process_auth
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@parse_repository_name()
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def get_tag_torrent(namespace_name, repo_name, digest):
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permission = ReadRepositoryPermission(namespace_name, repo_name)
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public_repo = model.repository.repository_is_public(namespace_name, repo_name)
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if not permission.can() and not public_repo:
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abort(403)
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user = get_authenticated_user()
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if user is None and not public_repo:
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# We can not generate a private torrent cluster without a user uuid (e.g. token auth)
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abort(403)
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try:
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blob = model.blob.get_repo_blob_by_digest(namespace_name, repo_name, digest)
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except model.BlobDoesNotExist:
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abort(404)
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return _torrent_for_storage(blob, public_repo)
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