591 lines
20 KiB
Python
591 lines
20 KiB
Python
import logging
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import json
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from flask import (make_response, request, session, Response, redirect,
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Blueprint, abort as flask_abort)
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from functools import wraps
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from datetime import datetime
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from time import time
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from app import storage as store, image_diff_queue, app
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from auth.auth import process_auth, extract_namespace_repo_from_session
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from auth.auth_context import get_authenticated_user, get_grant_user_context
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from util import checksums, changes
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from util.http import abort, exact_abort
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from auth.permissions import (ReadRepositoryPermission,
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ModifyRepositoryPermission)
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from data import model, database
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from util import gzipstream
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registry = Blueprint('registry', __name__)
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logger = logging.getLogger(__name__)
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class SocketReader(object):
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def __init__(self, fp):
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self._fp = fp
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self.handlers = []
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def add_handler(self, handler):
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self.handlers.append(handler)
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def read(self, n=-1):
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buf = self._fp.read(n)
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if not buf:
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return ''
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for handler in self.handlers:
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handler(buf)
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return buf
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def tell(self):
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raise IOError('Stream is not seekable.')
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def image_is_uploading(repo_image):
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if repo_image is None:
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return False
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return repo_image.storage.uploading
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def set_uploading_flag(repo_image, is_image_uploading):
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repo_image.storage.uploading = is_image_uploading
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repo_image.storage.save()
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def require_completion(f):
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"""This make sure that the image push correctly finished."""
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@wraps(f)
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def wrapper(namespace, repository, *args, **kwargs):
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image_id = kwargs['image_id']
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repo_image = model.get_repo_image_extended(namespace, repository, image_id)
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if image_is_uploading(repo_image):
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abort(400, 'Image %(image_id)s is being uploaded, retry later',
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issue='upload-in-progress', image_id=kwargs['image_id'])
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return f(namespace, repository, *args, **kwargs)
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return wrapper
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def set_cache_headers(f):
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"""Returns HTTP headers suitable for caching."""
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@wraps(f)
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def wrapper(*args, **kwargs):
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# Set TTL to 1 year by default
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ttl = 31536000
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expires = datetime.fromtimestamp(int(time()) + ttl)
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expires = expires.strftime('%a, %d %b %Y %H:%M:%S GMT')
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headers = {
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'Cache-Control': 'public, max-age={0}'.format(ttl),
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'Expires': expires,
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'Last-Modified': 'Thu, 01 Jan 1970 00:00:00 GMT',
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}
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if 'If-Modified-Since' in request.headers:
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response = make_response('Not modified', 304)
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response.headers.extend(headers)
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return response
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kwargs['headers'] = headers
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# Prevent the Cookie to be sent when the object is cacheable
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session.modified = False
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return f(*args, **kwargs)
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return wrapper
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@registry.route('/images/<image_id>/layer', methods=['HEAD'])
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@process_auth
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@extract_namespace_repo_from_session
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@require_completion
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@set_cache_headers
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def head_image_layer(namespace, repository, image_id, headers):
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permission = ReadRepositoryPermission(namespace, repository)
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logger.debug('Checking repo permissions')
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if permission.can() or model.repository_is_public(namespace, repository):
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logger.debug('Looking up repo image')
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repo_image = model.get_repo_image_extended(namespace, repository, image_id)
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if not repo_image:
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logger.debug('Image not found')
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abort(404, 'Image %(image_id)s not found', issue='unknown-image',
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image_id=image_id)
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extra_headers = {}
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# Add the Accept-Ranges header if the storage engine supports resumable
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# downloads.
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if store.get_supports_resumable_downloads(repo_image.storage.locations):
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logger.debug('Storage supports resumable downloads')
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extra_headers['Accept-Ranges'] = 'bytes'
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resp = make_response('')
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resp.headers.extend(headers)
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resp.headers.extend(extra_headers)
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return resp
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abort(403)
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@registry.route('/images/<image_id>/layer', methods=['GET'])
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@process_auth
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@extract_namespace_repo_from_session
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@require_completion
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@set_cache_headers
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def get_image_layer(namespace, repository, image_id, headers):
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permission = ReadRepositoryPermission(namespace, repository)
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logger.debug('Checking repo permissions')
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if permission.can() or model.repository_is_public(namespace, repository):
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logger.debug('Looking up repo image')
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repo_image = model.get_repo_image_extended(namespace, repository, image_id)
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if not repo_image:
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logger.debug('Image not found')
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abort(404, 'Image %(image_id)s not found', issue='unknown-image',
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image_id=image_id)
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logger.debug('Looking up the layer path')
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try:
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path = store.image_layer_path(repo_image.storage.uuid)
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logger.debug('Looking up the direct download URL')
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direct_download_url = store.get_direct_download_url(repo_image.storage.locations, path)
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if direct_download_url:
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logger.debug('Returning direct download URL')
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resp = redirect(direct_download_url)
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return resp
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logger.debug('Streaming layer data')
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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 Response(store.stream_read(repo_image.storage.locations, path), headers=headers)
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except (IOError, AttributeError):
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logger.exception('Image layer data not found')
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abort(404, 'Image %(image_id)s not found', issue='unknown-image',
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image_id=image_id)
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abort(403)
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@registry.route('/images/<image_id>/layer', methods=['PUT'])
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@process_auth
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@extract_namespace_repo_from_session
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def put_image_layer(namespace, repository, image_id):
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logger.debug('Checking repo permissions')
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permission = ModifyRepositoryPermission(namespace, repository)
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if not permission.can():
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abort(403)
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logger.debug('Retrieving image')
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repo_image = model.get_repo_image_extended(namespace, repository, image_id)
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try:
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logger.debug('Retrieving image data')
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uuid = repo_image.storage.uuid
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json_data = store.get_content(repo_image.storage.locations, store.image_json_path(uuid))
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except (IOError, AttributeError):
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logger.exception('Exception when retrieving image data')
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abort(404, 'Image %(image_id)s not found', issue='unknown-image',
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image_id=image_id)
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logger.debug('Retrieving image path info')
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layer_path = store.image_layer_path(uuid)
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if (store.exists(repo_image.storage.locations, layer_path) and not
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image_is_uploading(repo_image)):
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exact_abort(409, 'Image already exists')
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logger.debug('Storing layer data')
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input_stream = request.stream
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if request.headers.get('transfer-encoding') == 'chunked':
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# Careful, might work only with WSGI servers supporting chunked
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# encoding (Gunicorn)
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input_stream = request.environ['wsgi.input']
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# Create a socket reader to read the input stream containing the layer data.
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sr = SocketReader(input_stream)
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# Add a handler that copies the data into a temp file. This is used to calculate the tarsum,
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# which is only needed for older versions of Docker.
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requires_tarsum = session.get('checksum_format') == 'tarsum'
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if requires_tarsum:
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tmp, tmp_hndlr = store.temp_store_handler()
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sr.add_handler(tmp_hndlr)
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# Add a handler to compute the compressed and uncompressed sizes of the layer.
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size_info, size_hndlr = gzipstream.calculate_size_handler()
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sr.add_handler(size_hndlr)
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# Add a handler which computes the checksum.
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h, sum_hndlr = checksums.simple_checksum_handler(json_data)
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sr.add_handler(sum_hndlr)
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# Stream write the data to storage.
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with database.CloseForLongOperation(app.config):
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store.stream_write(repo_image.storage.locations, layer_path, sr)
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# Append the computed checksum.
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csums = []
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csums.append('sha256:{0}'.format(h.hexdigest()))
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try:
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# Save the size of the image.
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model.set_image_size(image_id, namespace, repository, size_info.compressed_size,
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size_info.uncompressed_size)
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if requires_tarsum:
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tmp.seek(0)
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csums.append(checksums.compute_tarsum(tmp, json_data))
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tmp.close()
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except (IOError, checksums.TarError) as e:
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logger.debug('put_image_layer: Error when computing tarsum '
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'{0}'.format(e))
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if repo_image.storage.checksum is None:
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# We don't have a checksum stored yet, that's fine skipping the check.
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# Not removing the mark though, image is not downloadable yet.
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session['checksum'] = csums
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return make_response('true', 200)
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checksum = repo_image.storage.checksum
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# We check if the checksums provided matches one the one we computed
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if checksum not in csums:
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logger.warning('put_image_layer: Wrong checksum')
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abort(400, 'Checksum mismatch; ignoring the layer for image %(image_id)s',
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issue='checksum-mismatch', image_id=image_id)
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# Checksum is ok, we remove the marker
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set_uploading_flag(repo_image, False)
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# The layer is ready for download, send a job to the work queue to
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# process it.
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logger.debug('Adding layer to diff queue')
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repo = model.get_repository(namespace, repository)
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image_diff_queue.put([repo.namespace_user.username, repository, image_id], json.dumps({
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'namespace_user_id': repo.namespace_user.id,
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'repository': repository,
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'image_id': image_id,
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}))
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return make_response('true', 200)
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@registry.route('/images/<image_id>/checksum', methods=['PUT'])
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@process_auth
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@extract_namespace_repo_from_session
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def put_image_checksum(namespace, repository, image_id):
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logger.debug('Checking repo permissions')
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permission = ModifyRepositoryPermission(namespace, repository)
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if not permission.can():
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abort(403)
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# Docker Version < 0.10 (tarsum+sha):
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old_checksum = request.headers.get('X-Docker-Checksum')
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# Docker Version >= 0.10 (sha):
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new_checksum = request.headers.get('X-Docker-Checksum-Payload')
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# Store whether we need to calculate the tarsum.
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if new_checksum:
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session['checksum_format'] = 'sha256'
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else:
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session['checksum_format'] = 'tarsum'
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checksum = new_checksum or old_checksum
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if not checksum:
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abort(400, "Missing checksum for image %(image_id)s", issue='missing-checksum',
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image_id=image_id)
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if not session.get('checksum'):
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abort(400, 'Checksum not found in Cookie for image %(image_id)s',
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issue='missing-checksum-cookie', image_id=image_id)
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logger.debug('Looking up repo image')
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repo_image = model.get_repo_image_extended(namespace, repository, image_id)
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if not repo_image or not repo_image.storage:
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abort(404, 'Image not found: %(image_id)s', issue='unknown-image', image_id=image_id)
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uuid = repo_image.storage.uuid
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logger.debug('Looking up repo layer data')
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if not store.exists(repo_image.storage.locations, store.image_json_path(uuid)):
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abort(404, 'Image not found: %(image_id)s', issue='unknown-image', image_id=image_id)
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logger.debug('Marking image path')
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if not image_is_uploading(repo_image):
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abort(409, 'Cannot set checksum for image %(image_id)s',
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issue='image-write-error', image_id=image_id)
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logger.debug('Storing image checksum')
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err = store_checksum(repo_image.storage, checksum)
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if err:
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abort(400, err)
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if checksum not in session.get('checksum', []):
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logger.debug('session checksums: %s' % session.get('checksum', []))
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logger.debug('client supplied checksum: %s' % checksum)
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logger.debug('put_image_checksum: Wrong checksum')
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abort(400, 'Checksum mismatch for image: %(image_id)s',
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issue='checksum-mismatch', image_id=image_id)
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# Checksum is ok, we remove the marker
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set_uploading_flag(repo_image, False)
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# The layer is ready for download, send a job to the work queue to
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# process it.
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logger.debug('Adding layer to diff queue')
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repo = model.get_repository(namespace, repository)
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image_diff_queue.put([repo.namespace_user.username, repository, image_id], json.dumps({
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'namespace_user_id': repo.namespace_user.id,
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'repository': repository,
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'image_id': image_id,
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}))
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return make_response('true', 200)
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@registry.route('/images/<image_id>/json', methods=['GET'])
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@process_auth
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@extract_namespace_repo_from_session
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@require_completion
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@set_cache_headers
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def get_image_json(namespace, repository, image_id, headers):
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logger.debug('Checking repo permissions')
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permission = ReadRepositoryPermission(namespace, repository)
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if not permission.can() and not model.repository_is_public(namespace,
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repository):
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abort(403)
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logger.debug('Looking up repo image')
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repo_image = model.get_repo_image_extended(namespace, repository, image_id)
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logger.debug('Looking up repo layer data')
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try:
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uuid = repo_image.storage.uuid
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data = store.get_content(repo_image.storage.locations, store.image_json_path(uuid))
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except (IOError, AttributeError):
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flask_abort(404)
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logger.debug('Looking up repo layer size')
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size = repo_image.storage.image_size
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headers['X-Docker-Size'] = str(size)
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response = make_response(data, 200)
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response.headers.extend(headers)
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return response
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@registry.route('/images/<image_id>/ancestry', methods=['GET'])
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@process_auth
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@extract_namespace_repo_from_session
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@require_completion
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@set_cache_headers
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def get_image_ancestry(namespace, repository, image_id, headers):
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logger.debug('Checking repo permissions')
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permission = ReadRepositoryPermission(namespace, repository)
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if not permission.can() and not model.repository_is_public(namespace,
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repository):
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abort(403)
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logger.debug('Looking up repo image')
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repo_image = model.get_repo_image_extended(namespace, repository, image_id)
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logger.debug('Looking up image data')
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try:
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uuid = repo_image.storage.uuid
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data = store.get_content(repo_image.storage.locations, store.image_ancestry_path(uuid))
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except (IOError, AttributeError):
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abort(404, 'Image %(image_id)s not found', issue='unknown-image',
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image_id=image_id)
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logger.debug('Converting to <-> from JSON')
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response = make_response(json.dumps(json.loads(data)), 200)
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response.headers.extend(headers)
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logger.debug('Done')
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return response
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def generate_ancestry(image_id, uuid, locations, parent_id=None, parent_uuid=None,
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parent_locations=None):
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if not parent_id:
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store.put_content(locations, store.image_ancestry_path(uuid), json.dumps([image_id]))
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return
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data = store.get_content(parent_locations, store.image_ancestry_path(parent_uuid))
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data = json.loads(data)
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data.insert(0, image_id)
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store.put_content(locations, store.image_ancestry_path(uuid), json.dumps(data))
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def store_checksum(image_storage, checksum):
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checksum_parts = checksum.split(':')
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if len(checksum_parts) != 2:
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return 'Invalid checksum format'
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# We store the checksum
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image_storage.checksum = checksum
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image_storage.save()
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@registry.route('/images/<image_id>/json', methods=['PUT'])
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@process_auth
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@extract_namespace_repo_from_session
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def put_image_json(namespace, repository, image_id):
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logger.debug('Checking repo permissions')
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permission = ModifyRepositoryPermission(namespace, repository)
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if not permission.can():
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abort(403)
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logger.debug('Parsing image JSON')
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try:
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data = json.loads(request.data.decode('utf8'))
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except ValueError:
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pass
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if not data or not isinstance(data, dict):
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abort(400, 'Invalid JSON for image: %(image_id)s\nJSON: %(json)s',
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issue='invalid-request', image_id=image_id, json=request.data)
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if 'id' not in data:
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abort(400, 'Missing key `id` in JSON for image: %(image_id)s',
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issue='invalid-request', image_id=image_id)
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logger.debug('Looking up repo image')
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repo = model.get_repository(namespace, repository)
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if repo is None:
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abort(404, 'Repository does not exist: %(namespace)s/%(repository)s', issue='no-repo',
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namespace=namespace, repository=repository)
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repo_image = model.get_repo_image_extended(namespace, repository, image_id)
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if not repo_image:
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username = (get_authenticated_user() and get_authenticated_user().username or
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get_grant_user_context())
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logger.debug('Image not found, creating image with initiating user context: %s', username)
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repo_image = model.find_create_or_link_image(image_id, repo, username, {},
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store.preferred_locations[0])
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# Create a temporary tag to prevent this image from getting garbage collected while the push
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# is in progress.
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model.create_temporary_hidden_tag(repo, repo_image, app.config['PUSH_TEMP_TAG_EXPIRATION_SEC'])
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uuid = repo_image.storage.uuid
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if image_id != data['id']:
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abort(400, 'JSON data contains invalid id for image: %(image_id)s',
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issue='invalid-request', image_id=image_id)
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parent_id = data.get('parent')
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parent_image = None
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if parent_id:
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logger.debug('Looking up parent image')
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parent_image = model.get_repo_image_extended(namespace, repository, parent_id)
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parent_uuid = parent_image and parent_image.storage.uuid
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parent_locations = parent_image and parent_image.storage.locations
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if parent_id:
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|
logger.debug('Looking up parent image data')
|
|
|
|
if (parent_id and not
|
|
store.exists(parent_locations, store.image_json_path(parent_uuid))):
|
|
abort(400, 'Image %(image_id)s depends on non existing parent image %(parent_id)s',
|
|
issue='invalid-request', image_id=image_id, parent_id=parent_id)
|
|
|
|
logger.debug('Looking up image storage paths')
|
|
json_path = store.image_json_path(uuid)
|
|
|
|
logger.debug('Checking if image already exists')
|
|
if (store.exists(repo_image.storage.locations, json_path) and not
|
|
image_is_uploading(repo_image)):
|
|
exact_abort(409, 'Image already exists')
|
|
|
|
set_uploading_flag(repo_image, True)
|
|
|
|
# If we reach that point, it means that this is a new image or a retry
|
|
# on a failed push
|
|
# save the metadata
|
|
command_list = data.get('container_config', {}).get('Cmd', None)
|
|
command = json.dumps(command_list) if command_list else None
|
|
|
|
logger.debug('Setting image metadata')
|
|
model.set_image_metadata(image_id, namespace, repository,
|
|
data.get('created'), data.get('comment'), command,
|
|
parent_image)
|
|
|
|
logger.debug('Putting json path')
|
|
store.put_content(repo_image.storage.locations, json_path, request.data)
|
|
|
|
logger.debug('Generating image ancestry')
|
|
|
|
try:
|
|
generate_ancestry(image_id, uuid, repo_image.storage.locations, parent_id, parent_uuid,
|
|
parent_locations)
|
|
except IOError as ioe:
|
|
logger.debug('Error when generating ancestry: %s' % ioe.message)
|
|
abort(404)
|
|
|
|
logger.debug('Done')
|
|
return make_response('true', 200)
|
|
|
|
|
|
def process_image_changes(namespace, repository, image_id):
|
|
logger.debug('Generating diffs for image: %s' % image_id)
|
|
|
|
repo_image = model.get_repo_image_extended(namespace, repository, image_id)
|
|
if not repo_image:
|
|
logger.warning('No image for id: %s', image_id)
|
|
return None, None
|
|
|
|
uuid = repo_image.storage.uuid
|
|
|
|
image_diffs_path = store.image_file_diffs_path(uuid)
|
|
image_trie_path = store.image_file_trie_path(uuid)
|
|
|
|
if store.exists(repo_image.storage.locations, image_diffs_path):
|
|
logger.debug('Diffs already exist for image: %s' % image_id)
|
|
return image_trie_path, repo_image.storage.locations
|
|
|
|
image = model.get_image_by_id(namespace, repository, image_id)
|
|
parents = model.get_parent_images(namespace, repository, image)
|
|
|
|
# Compute the diffs and fs for the parent first if necessary
|
|
parent_trie_path = None
|
|
if parents:
|
|
parent_trie_path, parent_locations = process_image_changes(namespace, repository,
|
|
parents[-1].docker_image_id)
|
|
|
|
# Read in the collapsed layer state of the filesystem for the parent
|
|
parent_trie = changes.empty_fs()
|
|
if parent_trie_path:
|
|
parent_trie_bytes = store.get_content(parent_locations, parent_trie_path)
|
|
parent_trie.frombytes(parent_trie_bytes)
|
|
|
|
# Read in the file entries from the layer tar file
|
|
layer_path = store.image_layer_path(uuid)
|
|
with store.stream_read_file(image.storage.locations, layer_path) as layer_tar_stream:
|
|
removed_files = set()
|
|
layer_files = changes.files_and_dirs_from_tar(layer_tar_stream,
|
|
removed_files)
|
|
|
|
new_metadata = changes.compute_new_diffs_and_fs(parent_trie, layer_files,
|
|
removed_files)
|
|
(new_trie, added, changed, removed) = new_metadata
|
|
|
|
# Write out the new trie
|
|
store.put_content(image.storage.locations, image_trie_path, new_trie.tobytes())
|
|
|
|
# Write out the diffs
|
|
diffs = {}
|
|
sections = ('added', 'changed', 'removed')
|
|
for section, source_trie in zip(sections, new_metadata[1:]):
|
|
diffs[section] = list(source_trie)
|
|
diffs[section].sort()
|
|
store.put_content(image.storage.locations, image_diffs_path, json.dumps(diffs, indent=2))
|
|
|
|
return image_trie_path, image.storage.locations
|