304 lines
10 KiB
Python
304 lines
10 KiB
Python
# Copyright 2019 Red Hat, Inc.
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#
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# This module is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This software is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this software. If not, see <http://www.gnu.org/licenses/>.
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import base64
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import json
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import logging
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import os
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import queue
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import rehash
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import threading
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import time
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from uuid import uuid4
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class UploadRecord:
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"""Information about an upload.
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This class holds information about an upload in progress. It is
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designed to be serialized into object storage and stored along
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with the data of the upload so that as each new chunk is uploaded,
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this is updated.
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The registry protocol guarantees that upload chunks are
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sequential, so this does not need to be locked for use by multiple
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writers.
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The most important part of this (that which could not otherwise be
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constructed from a simple object listing) is the resumable hash of
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the contents. We need to calculate the hash of the complete
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upload, but we would like to support chunks being written by
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different writers (for example, in a simple round-robin load
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balancer). If we store the state of the hash algorithm after each
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chunk is uploaded, we can avoid having to download the entire data
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again at the end merely to calculate the hash.
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"""
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def __init__(self):
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self.chunks = []
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self.hasher = rehash.sha256()
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@property
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def count(self):
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return len(self.chunks)
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@property
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def size(self):
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return sum([x['size'] for x in self.chunks])
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@property
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def digest(self):
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return 'sha256:' + self.hasher.hexdigest()
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def load(self, data):
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data = json.loads(data.decode('utf8'))
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self.chunks = data['chunks']
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hash_state = data['hash_state']
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hash_state['md_data'] = base64.decodebytes(
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hash_state['md_data'].encode('ascii'))
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self.hasher.__setstate__(hash_state)
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def dump(self):
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hash_state = self.hasher.__getstate__()
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hash_state['md_data'] = base64.encodebytes(
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hash_state['md_data']).decode('ascii')
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data = dict(chunks=self.chunks,
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hash_state=hash_state)
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return json.dumps(data).encode('utf8')
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class UploadStreamer:
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"""Stream an upload to the object storage.
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This returns data from an internal buffer as a generator. Pass
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this to the `put_object` method to supply streaming data to it in
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one thread, while another adds data to the buffer using the
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`write` method.
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"""
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def __init__(self):
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self.queue = queue.Queue()
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def write(self, data):
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self.queue.put(data)
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def __iter__(self):
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while True:
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d = self.queue.get()
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if d is None:
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break
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yield d
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class Storage:
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"""Storage abstraction layer.
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This class abstracts different storage backends, providing a
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convenience API to the registry.
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Most of these methods take a namespace argument. The namespace
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is, essentially, an entire registry isolated from the other
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namespaces. They may even have duplicate object data. This
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allows us to support serving multiple registries from the same
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process (without confusing the contents of them).
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"""
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# Clients have 1 hour to complete an upload before we start
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# deleting stale objects.
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upload_exp = 60 * 60
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log = logging.getLogger('registry.storage')
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def __init__(self, backend, conf):
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self.backend = backend
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if 'expiration' in conf:
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self.manifest_exp = conf['expiration']
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else:
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self.manifest_exp = None
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def blob_size(self, namespace, digest):
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path = os.path.join(namespace, 'blobs', digest, 'data')
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return self.backend.get_object_size(path)
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def put_blob(self, namespace, digest, data):
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path = os.path.join(namespace, 'blobs', digest, 'data')
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return self.backend.put_object(path, data)
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def get_blob(self, namespace, digest):
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path = os.path.join(namespace, 'blobs', digest, 'data')
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return self.backend.get_object(path)
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def start_upload(self, namespace):
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"""Start an upload.
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Create an empty UploadRecord and store it. Later methods will
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add to it. The uuid attribute of the UploadRecord uniquely
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identifies the upload.
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Uploads have one or more chunks. See `upload_chunk`.
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"""
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uuid = uuid4().hex
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upload = UploadRecord()
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self._update_upload(namespace, uuid, upload)
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return uuid
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def _get_upload(self, namespace, uuid):
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path = os.path.join(namespace, 'uploads', uuid, 'metadata')
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data = self.backend.get_object(path)
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upload = UploadRecord()
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upload.load(data)
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return upload
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def _update_upload(self, namespace, uuid, upload):
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path = os.path.join(namespace, 'uploads', uuid, 'metadata')
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self.backend.put_object(path, upload.dump())
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def upload_chunk(self, namespace, uuid, fp):
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"""Add a chunk to an upload.
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Uploads contain one or more chunk of data which are ultimately
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concatenated into one blob.
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This streams the data from `fp` and writes it into the
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registry.
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:arg namespace str: The registry namespace.
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:arg uuid str: The UUID of the upload.
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:arg file fp: An open file pointer to the source data.
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"""
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upload = self._get_upload(namespace, uuid)
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path = os.path.join(namespace, 'uploads', uuid, str(upload.count + 1))
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streamer = UploadStreamer()
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t = threading.Thread(target=self.backend.put_object,
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args=(path, streamer))
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t.start()
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size = 0
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while True:
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try:
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d = fp.read(4096)
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except ValueError:
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# We get this on an empty body
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d = b''
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if not d:
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break
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upload.hasher.update(d)
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size += len(d)
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streamer.write(d)
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streamer.write(None)
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t.join()
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upload.chunks.append(dict(size=size))
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self._update_upload(namespace, uuid, upload)
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return upload.size - size, upload.size
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def store_upload(self, namespace, uuid, digest):
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"""Complete an upload.
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Verify the supplied digest matches the uploaded data, and if
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so, stores the uploaded data as a blob in the registry. Until
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this is called, the upload is incomplete and the data blob is
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not addressible.
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"""
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upload = self._get_upload(namespace, uuid)
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if digest != upload.digest:
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raise Exception('Digest does not match %s %s' %
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(digest, upload.digest))
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# Move the chunks into the blob dir to get them out of the
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# uploads dir.
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chunks = []
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for i in range(1, upload.count + 1):
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src_path = os.path.join(namespace, 'uploads', uuid, str(i))
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dst_path = os.path.join(namespace, 'blobs', digest, str(i))
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chunks.append(dst_path)
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self.backend.move_object(src_path, dst_path)
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# Concatenate the chunks into one blob.
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path = os.path.join(namespace, 'blobs', digest, 'data')
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self.backend.cat_objects(path, chunks)
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path = os.path.join(namespace, 'uploads', uuid, 'metadata')
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self.backend.delete_object(path)
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def put_manifest(self, namespace, repo, tag, data):
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path = os.path.join(namespace, 'repos', repo, 'manifests', tag)
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self.backend.put_object(path, data)
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def get_manifest(self, namespace, repo, tag):
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path = os.path.join(namespace, 'repos', repo, 'manifests', tag)
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return self.backend.get_object(path)
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def prune(self):
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"""Prune the registry
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Prune all namespaces in the registry according to configured
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expiration times.
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"""
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now = time.time()
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upload_target = now - self.upload_exp
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if self.manifest_exp:
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manifest_target = now - self.manifest_exp
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else:
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manifest_target = None
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for namespace in self.backend.list_objects(''):
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uploadpath = os.path.join(namespace.path, 'uploads/')
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for upload in self.backend.list_objects(uploadpath):
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self._prune(upload, upload_target)
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if not manifest_target:
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continue
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repopath = os.path.join(namespace.path, 'repos/')
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for repo in self.backend.list_objects(repopath):
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kept_manifests = self._prune(repo, manifest_target)
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# mark/sweep manifest blobs
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layers = set()
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for manifest in kept_manifests:
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if manifest.isdir:
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continue
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layers.update(self._get_layers_from_manifest(
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namespace.name, manifest.path))
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blobpath = os.path.join(namespace.path, 'blobs/')
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for blob in self.backend.list_objects(blobpath):
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if blob.name not in layers:
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self._prune(blob, upload_target)
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def _get_layers_from_manifest(self, namespace, path):
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self.log.debug('Get layers %s', path)
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data = self.backend.get_object(path)
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manifest = json.loads(data)
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target = manifest.get(
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'application/vnd.docker.distribution.manifest.v2+json')
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layers = []
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if not target:
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self.log.debug('Unknown manifest %s', path)
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return layers
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layers.append(target)
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data = self.get_blob(namespace, target)
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manifest = json.loads(data)
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layers.append(manifest['config']['digest'])
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for layer in manifest['layers']:
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layers.append(layer['digest'])
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return layers
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def _prune(self, root_obj, target):
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kept = []
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if root_obj.isdir:
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for obj in self.backend.list_objects(root_obj.path):
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kept.extend(self._prune(obj, target))
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if not kept and root_obj.ctime < target:
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self.log.debug('Prune %s', root_obj.path)
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self.backend.delete_object(root_obj.path)
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else:
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self.log.debug('Keep %s', root_obj.path)
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kept.append(root_obj)
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return kept
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