Add the basics of geographic data distribution and get the tests to work.

config.py

@@ -72,10 +72,6 @@ class DefaultConfig(object):
   # copies.
   USE_CDN = True
 
-  # Data storage
-  STORAGE_TYPE = 'LocalStorage'
-  STORAGE_PATH = 'test/data/registry'
-
   # Authentication
   AUTHENTICATION_TYPE = 'Database'
 
@@ -149,3 +145,10 @@ class DefaultConfig(object):
 
   # Feature Flag: Whether to support GitHub build triggers.
   FEATURE_GITHUB_BUILD = False
+
+  DISTRIBUTED_STORAGE_CONFIG = {
+    'local_eu': ['LocalStorage', 'test/data/registry/eu'],
+    'local_us': ['LocalStorage', 'test/data/registry/us'],
+  }
+
+  DISTRIBUTED_STORAGE_PREFERENCE = ['local_us']

data/database.py

@@ -222,6 +222,22 @@ class ImageStorage(BaseModel):
   uploading = BooleanField(default=True, null=True)
 
 
+class ImageStorageLocation(BaseModel):
+  name = CharField(unique=True, index=True)
+
+
+class ImageStoragePlacement(BaseModel):
+  storage = ForeignKeyField(ImageStorage)
+  location = ForeignKeyField(ImageStorageLocation)
+
+  class Meta:
+    database = db
+    indexes = (
+      # An image can only be placed in the same place once
+      (('storage', 'location'), True),
+    )
+
+
 class Image(BaseModel):
   # This class is intentionally denormalized. Even though images are supposed
   # to be globally unique we can't treat them as such for permissions and
@@ -341,4 +357,4 @@ all_models = [User, Repository, Image, AccessToken, Role, RepositoryPermission,
               RepositoryBuild, Team, TeamMember, TeamRole, Webhook, LogEntryKind, LogEntry,
               PermissionPrototype, ImageStorage, BuildTriggerService, RepositoryBuildTrigger,
               OAuthApplication, OAuthAuthorizationCode, OAuthAccessToken, NotificationKind,
-              Notification]
+              Notification, ImageStorageLocation, ImageStoragePlacement]

data/model/legacy.py

@@ -845,20 +845,28 @@ def get_repository(namespace_name, repository_name):
 
 
 def get_repo_image(namespace_name, repository_name, image_id):
-  query = (Image
-    .select(Image, ImageStorage)
+  location_list = list((ImageStoragePlacement
+    .select(ImageStoragePlacement, Image, ImageStorage, ImageStorageLocation)
+    .join(ImageStorageLocation)
+    .switch(ImageStoragePlacement)
+    .join(ImageStorage)
+    .join(Image)
     .join(Repository)
-    .switch(Image)
-    .join(ImageStorage, JOIN_LEFT_OUTER)
     .where(Repository.name == repository_name,
            Repository.namespace == namespace_name,
-           Image.docker_image_id == image_id))
+           Image.docker_image_id == image_id)))
   
-  try:
-    return query.get()
-  except Image.DoesNotExist:
+  if not location_list:
     return None
 
+  location_names = {location.location.name for location in location_list}
+
+  image = location_list[0].storage.image
+  image.storage = location_list[0].storage
+  image.storage.locations = location_names
+
+  return image
+
 
 def repository_is_public(namespace_name, repository_name):
   joined = Repository.select().join(Visibility)
@@ -940,7 +948,7 @@ def create_repository(namespace, name, creating_user, visibility='private'):
   return repo
 
 
-def __translate_ancestry(old_ancestry, translations, repository, username):
+def __translate_ancestry(old_ancestry, translations, repository, username, preferred_location):
   if old_ancestry == '/':
     return '/'
 
@@ -950,9 +958,8 @@ def __translate_ancestry(old_ancestry, translations, repository, username):
       # Figure out which docker_image_id the old id refers to, then find a
       # a local one
       old = Image.select(Image.docker_image_id).where(Image.id == old_id).get()
-      image_in_repo = find_create_or_link_image(old.docker_image_id,
-                                                repository, username,
-                                                translations)
+      image_in_repo = find_create_or_link_image(old.docker_image_id, repository, username,
+                                                translations, preferred_location)
       translations[old_id] = image_in_repo.id
 
     return translations[old_id]
@@ -962,8 +969,8 @@ def __translate_ancestry(old_ancestry, translations, repository, username):
   return '/%s/' % '/'.join(new_ids)
 
 
-def find_create_or_link_image(docker_image_id, repository, username,
-                              translations):
+def find_create_or_link_image(docker_image_id, repository, username, translations,
+                              preferred_location):
   with config.app_config['DB_TRANSACTION_FACTORY'](db):
     repo_image = get_repo_image(repository.namespace, repository.name,
                                 docker_image_id)
@@ -990,20 +997,29 @@ def find_create_or_link_image(docker_image_id, repository, username,
       msg = 'Linking image to existing storage with docker id: %s and uuid: %s'
       logger.debug(msg, docker_image_id, to_copy.storage.uuid)
       
-      new_image_ancestry = __translate_ancestry(to_copy.ancestors,
-                                                translations, repository,
-                                                username)
+      new_image_ancestry = __translate_ancestry(to_copy.ancestors, translations, repository,
+                                                username, preferred_location)
 
       storage = to_copy.storage
+      storage.locations = {placement.location.name
+                           for placement in storage.imagestorageplacement_set}
       origin_image_id = to_copy.id
     except Image.DoesNotExist:
       logger.debug('Creating new storage for docker id: %s', docker_image_id)
       storage = ImageStorage.create()
+      location = ImageStorageLocation.get(name=preferred_location)
+      ImageStoragePlacement.create(location=location, storage=storage)
+      storage.locations = {preferred_location}
+
+    logger.debug('Storage locations: %s', storage.locations)
 
     new_image = Image.create(docker_image_id=docker_image_id,
                              repository=repository, storage=storage,
                              ancestors=new_image_ancestry)
 
+    logger.debug('new_image storage locations: %s', new_image.storage.locations)
+
+
     if origin_image_id:
       logger.debug('Storing translation %s -> %s', origin_image_id, new_image.id)
       translations[origin_image_id] = new_image.id
@@ -1130,9 +1146,14 @@ def garbage_collect_repository(namespace_name, repository_name):
 
       for storage in storage_to_remove:
         logger.debug('Garbage collecting image storage: %s', storage.uuid)
-        storage.delete_instance()
+
         image_path = config.store.image_path(storage.uuid)      
-        config.store.remove(image_path)
+        for placement in storage.imagestorageplacement_set:
+          location_name = placement.location.name
+          placement.delete_instance()
+          config.store.remove(location_name, image_path)
+
+        storage.delete_instance()
 
     return len(to_remove)
 

endpoints/api/image.py

@@ -82,7 +82,7 @@ class RepositoryImageChanges(RepositoryParamResource):
     diffs_path = store.image_file_diffs_path(image.storage.uuid)
 
     try:
-      response_json = json.loads(store.get_content(diffs_path))
+      response_json = json.loads(store.get_content(image.storage.locations, diffs_path))
       return response_json
     except IOError:
       raise NotFound()

endpoints/index.py

@@ -8,7 +8,7 @@ from collections import OrderedDict
 
 from data import model
 from data.model import oauth
-from app import analytics, app, webhook_queue, authentication, userevents
+from app import analytics, app, webhook_queue, authentication, userevents, storage
 from auth.auth import process_auth
 from auth.auth_context import get_authenticated_user, get_validated_token, get_validated_oauth_token
 from util.names import parse_repository_name
@@ -228,7 +228,7 @@ def create_repository(namespace, repository):
   translations = {}
   for image_description in added_images.values():
     model.find_create_or_link_image(image_description['id'], repo, username,
-                                    translations)
+                                    translations, storage.preferred_locations[0])
 
 
   profile.debug('Created images')

endpoints/registry.py

@@ -106,14 +106,14 @@ def get_image_layer(namespace, repository, image_id, headers):
       path = store.image_layer_path(repo_image.storage.uuid)
 
       profile.debug('Looking up the direct download URL')
-      direct_download_url = store.get_direct_download_url(path)
+      direct_download_url = store.get_direct_download_url(repo_image.storage.locations, path)
 
       if direct_download_url:
         profile.debug('Returning direct download URL')
         return redirect(direct_download_url)
 
       profile.debug('Streaming layer data')
-      return Response(store.stream_read(path), headers=headers)
+      return Response(store.stream_read(repo_image.storage.locations, path), headers=headers)
     except (IOError, AttributeError):
       profile.debug('Image not found')
       abort(404, 'Image %(image_id)s not found', issue='unknown-image',
@@ -136,7 +136,7 @@ def put_image_layer(namespace, repository, image_id):
   try:
     profile.debug('Retrieving image data')
     uuid = repo_image.storage.uuid
-    json_data = store.get_content(store.image_json_path(uuid))
+    json_data = store.get_content(repo_image.storage.locations, store.image_json_path(uuid))
   except (IOError, AttributeError):
     abort(404, 'Image %(image_id)s not found', issue='unknown-image',
           image_id=image_id)
@@ -144,7 +144,7 @@ def put_image_layer(namespace, repository, image_id):
   profile.debug('Retrieving image path info')
   layer_path = store.image_layer_path(uuid)
 
-  if (store.exists(layer_path) and not
+  if (store.exists(repo_image.storage.locations, layer_path) and not
       image_is_uploading(repo_image)):
     exact_abort(409, 'Image already exists')
 
@@ -163,7 +163,7 @@ def put_image_layer(namespace, repository, image_id):
   sr.add_handler(store_hndlr)
   h, sum_hndlr = checksums.simple_checksum_handler(json_data)
   sr.add_handler(sum_hndlr)
-  store.stream_write(layer_path, sr)
+  store.stream_write(repo_image.storage.locations, layer_path, sr)
   csums.append('sha256:{0}'.format(h.hexdigest()))
 
   try:
@@ -231,7 +231,7 @@ def put_image_checksum(namespace, repository, image_id):
   uuid = repo_image.storage.uuid
 
   profile.debug('Looking up repo layer data')
-  if not store.exists(store.image_json_path(uuid)):
+  if not store.exists(repo_image.storage.locations, store.image_json_path(uuid)):
     abort(404, 'Image not found: %(image_id)s', issue='unknown-image', image_id=image_id)
 
   profile.debug('Marking image path')
@@ -283,7 +283,8 @@ def get_image_json(namespace, repository, image_id, headers):
 
   profile.debug('Looking up repo layer data')
   try:
-    data = store.get_content(store.image_json_path(repo_image.storage.uuid))
+    uuid = repo_image.storage.uuid
+    data = store.get_content(repo_image.storage.locations, store.image_json_path(uuid))
   except (IOError, AttributeError):
     flask_abort(404)
 
@@ -313,7 +314,8 @@ def get_image_ancestry(namespace, repository, image_id, headers):
 
   profile.debug('Looking up image data')
   try:
-    data = store.get_content(store.image_ancestry_path(repo_image.storage.uuid))
+    uuid = repo_image.storage.uuid
+    data = store.get_content(repo_image.storage.locations, store.image_ancestry_path(uuid))
   except (IOError, AttributeError):
     abort(404, 'Image %(image_id)s not found', issue='unknown-image',
           image_id=image_id)
@@ -326,17 +328,15 @@ def get_image_ancestry(namespace, repository, image_id, headers):
   return response
 
 
-def generate_ancestry(image_id, uuid, parent_id=None,
-                      parent_uuid=None):
+def generate_ancestry(image_id, uuid, locations, parent_id=None, parent_uuid=None,
+                      parent_locations=None):
   if not parent_id:
-    store.put_content(store.image_ancestry_path(uuid),
-                      json.dumps([image_id]))
+    store.put_content(locations, store.image_ancestry_path(uuid), json.dumps([image_id]))
     return
-  data = store.get_content(store.image_ancestry_path(parent_uuid))
+  data = store.get_content(parent_locations, store.image_ancestry_path(parent_uuid))
   data = json.loads(data)
   data.insert(0, image_id)
-  store.put_content(store.image_ancestry_path(uuid),
-                    json.dumps(data))
+  store.put_content(locations, store.image_ancestry_path(uuid), json.dumps(data))
 
 
 def store_checksum(image_storage, checksum):
@@ -393,7 +393,7 @@ def put_image_json(namespace, repository, image_id):
     profile.debug('Looking up parent image data')
 
   if (parent_id and not
-      store.exists(store.image_json_path(parent_uuid))):
+      store.exists(parent_image.storage.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)
 
@@ -401,7 +401,7 @@ def put_image_json(namespace, repository, image_id):
   json_path = store.image_json_path(uuid)
 
   profile.debug('Checking if image already exists')
-  if (store.exists(json_path) and not
+  if (store.exists(repo_image.storage.locations, json_path) and not
       image_is_uploading(repo_image)):
     exact_abort(409, 'Image already exists')
 
@@ -424,10 +424,11 @@ def put_image_json(namespace, repository, image_id):
                            parent_image)
 
   profile.debug('Putting json path')
-  store.put_content(json_path, request.data)
+  store.put_content(repo_image.storage.locations, json_path, request.data)
 
   profile.debug('Generating image ancestry')
-  generate_ancestry(image_id, uuid, parent_id, parent_uuid)
+  generate_ancestry(image_id, uuid, repo_image.storage.locations, parent_id, parent_uuid,
+                    parent_image.storage.locations)
 
   profile.debug('Done')
   return make_response('true', 200)
@@ -442,7 +443,7 @@ def process_image_changes(namespace, repository, image_id):
   image_diffs_path = store.image_file_diffs_path(uuid)
   image_trie_path = store.image_file_trie_path(uuid)
 
-  if store.exists(image_diffs_path):
+  if store.exists(repo_image.storage.locations, image_diffs_path):
     logger.debug('Diffs already exist for image: %s' % image_id)
     return image_trie_path
 
@@ -452,18 +453,18 @@ def process_image_changes(namespace, repository, image_id):
   # Compute the diffs and fs for the parent first if necessary
   parent_trie_path = None
   if parents:
-    parent_trie_path = process_image_changes(namespace, repository,
+    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_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(layer_path) as layer_tar_stream:
+  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)
@@ -473,7 +474,7 @@ def process_image_changes(namespace, repository, image_id):
   (new_trie, added, changed, removed) = new_metadata
 
   # Write out the new trie
-  store.put_content(image_trie_path, new_trie.tobytes())
+  store.put_content(image.storage.locations, image_trie_path, new_trie.tobytes())
 
   # Write out the diffs
   diffs = {}
@@ -481,6 +482,6 @@ def process_image_changes(namespace, repository, image_id):
   for section, source_trie in zip(sections, new_metadata[1:]):
     diffs[section] = list(source_trie)
     diffs[section].sort()
-  store.put_content(image_diffs_path, json.dumps(diffs, indent=2))
+  store.put_content(image.storage.locations, image_diffs_path, json.dumps(diffs, indent=2))
 
-  return image_trie_path
+  return image_trie_path, image.storage.locations

initdb.py

@@ -67,8 +67,8 @@ def __create_subtree(repo, structure, creator_username, parent):
     logger.debug('new docker id: %s' % docker_image_id)
     checksum = __gen_checksum(docker_image_id)
 
-    new_image = model.find_create_or_link_image(docker_image_id, repo, None,
-                                                {})
+    new_image = model.find_create_or_link_image(docker_image_id, repo, None, {}, 'local_us')
+    new_image_locations = new_image.storage.locations
     new_image.storage.uuid = IMAGE_UUIDS[image_num % len(IMAGE_UUIDS)]
     new_image.storage.uploading = False
     new_image.storage.checksum = checksum
@@ -89,7 +89,7 @@ def __create_subtree(repo, structure, creator_username, parent):
     source_diff = SAMPLE_DIFFS[image_num % len(SAMPLE_DIFFS)]
 
     with open(source_diff, 'r') as source_file:
-      store.stream_write(diff_path, source_file)
+      store.stream_write(new_image_locations, diff_path, source_file)
 
     parent = new_image
 
@@ -235,6 +235,9 @@ def initialize_database():
 
   NotificationKind.create(name='test_notification')
 
+  ImageStorageLocation.create(name='local_eu')
+  ImageStorageLocation.create(name='local_us')
+
 
 def wipe_database():
   logger.debug('Wiping all data from the DB.')

storage/__init__.py

@@ -1,6 +1,7 @@
 from storage.local import LocalStorage
 from storage.s3 import S3Storage
 from storage.fakestorage import FakeStorage
+from storage.distributedstorage import DistributedStorage
 
 
 class Storage(object):
@@ -12,25 +13,32 @@ class Storage(object):
       self.state = None
 
   def init_app(self, app):
-    storage_type = app.config.get('STORAGE_TYPE', 'LocalStorage')
-    path = app.config.get('STORAGE_PATH', '')
+    # storage_type = app.config.get('STORAGE_TYPE', 'LocalStorage')
+    # path = app.config.get('STORAGE_PATH', '')
 
-    if storage_type == 'LocalStorage':
-      storage = LocalStorage(path)
-
-    elif storage_type == 'S3Storage':
-      access_key = app.config.get('STORAGE_AWS_ACCESS_KEY', '')
-      secret_key = app.config.get('STORAGE_AWS_SECRET_KEY', '')
-      bucket = app.config.get('STORAGE_S3_BUCKET', '')
-      storage = S3Storage(path, access_key, secret_key, bucket)
+    storages = {}
+    for location, storage_params in app.config.get('DISTRIBUTED_STORAGE_CONFIG').items():
+      driver = storage_params[0]
 
+      if driver == 'LocalStorage':
+        storage = LocalStorage(*storage_params[1:])
+      elif driver == 'S3Storage':
+        storage = S3Storage(*storage_params[1:])
       else:
         storage = FakeStorage()
 
+      storages[location] = storage
+
+    preference = app.config.get('DISTRIBUTED_STORAGE_PREFERENCE', None)
+    if not preference:
+      preference = storages.keys()
+
+    d_storage = DistributedStorage(storages, preference)
+
     # register extension with app
     app.extensions = getattr(app, 'extensions', {})
-    app.extensions['storage'] = storage
-    return storage
+    app.extensions['storage'] = d_storage
+    return d_storage
 
   def __getattr__(self, name):
     return getattr(self.state, name, None)

storage/basestorage.py

@@ -1,33 +1,8 @@
 import tempfile
 
 
-class BaseStorage(object):
-
-  """Storage is organized as follow:
-  $ROOT/images/<image_id>/json
-  $ROOT/images/<image_id>/layer
-  $ROOT/repositories/<namespace>/<repository_name>/<tag_name>
-  """
-
-  # Useful if we want to change those locations later without rewriting
-  # the code which uses Storage
-  repositories = 'repositories'
-  images = 'images'
+class StoragePaths(object):
   shared_images = 'sharedimages'
-  # Set the IO buffer to 64kB
-  buffer_size = 64 * 1024
-
-  @staticmethod
-  def temp_store_handler():
-    tmpf = tempfile.TemporaryFile()
-  
-    def fn(buf):
-      try:
-        tmpf.write(buf)
-      except IOError:
-        pass
-  
-    return tmpf, fn
 
   def image_path(self, storage_uuid):
     return '{0}/{1}/'.format(self.shared_images, storage_uuid)
@@ -52,6 +27,33 @@ class BaseStorage(object):
     base_path = self.image_path(storage_uuid)
     return '{0}diffs.json'.format(base_path)
 
+
+class BaseStorage(StoragePaths):
+  """Storage is organized as follow:
+  $ROOT/images/<image_id>/json
+  $ROOT/images/<image_id>/layer
+  $ROOT/repositories/<namespace>/<repository_name>/<tag_name>
+  """
+
+  # Useful if we want to change those locations later without rewriting
+  # the code which uses Storage
+  repositories = 'repositories'
+  images = 'images'
+  # Set the IO buffer to 64kB
+  buffer_size = 64 * 1024
+
+  @staticmethod
+  def temp_store_handler():
+    tmpf = tempfile.TemporaryFile()
+  
+    def fn(buf):
+      try:
+        tmpf.write(buf)
+      except IOError:
+        pass
+  
+    return tmpf, fn
+
   def get_direct_download_url(self, path, expires_in=60):
     return None
 

storage/distributedstorage.py

@@ -0,0 +1,41 @@
+import random
+import logging
+
+from functools import wraps
+
+from storage.basestorage import StoragePaths, BaseStorage
+
+
+logger = logging.getLogger(__name__)
+
+
+def _location_aware(unbound_func):
+  @wraps(unbound_func)
+  def wrapper(self, locations, *args, **kwargs):
+    storage = None
+    for preferred in self.preferred_locations:
+      if preferred in locations:
+        storage = self._storages[preferred]
+
+    if not storage:
+      storage = self._storages[random.sample(locations, 1)[0]]
+
+    storage_func = getattr(storage, unbound_func.__name__)
+    return storage_func(*args, **kwargs)
+  return wrapper
+
+
+class DistributedStorage(StoragePaths):
+  def __init__(self, storages, preferred_locations=[]):
+    self._storages = dict(storages)
+    self.preferred_locations = list(preferred_locations)
+
+  get_direct_download_url = _location_aware(BaseStorage.get_direct_download_url)
+  get_content = _location_aware(BaseStorage.get_content)
+  put_content = _location_aware(BaseStorage.put_content)
+  stream_read = _location_aware(BaseStorage.stream_read)
+  stream_read_file = _location_aware(BaseStorage.stream_read_file)
+  stream_write = _location_aware(BaseStorage.stream_write)
+  list_directory = _location_aware(BaseStorage.list_directory)
+  exists = _location_aware(BaseStorage.exists)
+  remove = _location_aware(BaseStorage.remove)

test/test_image_sharing.py

@@ -3,7 +3,7 @@ import json as py_json
 
 from flask import url_for
 from endpoints.api import api
-from app import app
+from app import app, storage
 from initdb import setup_database_for_testing, finished_database_for_testing
 from data import model
 
@@ -43,7 +43,9 @@ class TestImageSharing(unittest.TestCase):
 
   def createStorage(self, docker_image_id, repository=REPO, username=ADMIN_ACCESS_USER):
     repository_obj = model.get_repository(repository.split('/')[0], repository.split('/')[1])
-    image = model.find_create_or_link_image(docker_image_id, repository_obj, username, {})
+    preferred = storage.preferred_locations[0]
+    image = model.find_create_or_link_image(docker_image_id, repository_obj, username, {},
+                                            preferred)
     return image.storage.id
 
   def assertSameStorage(self, docker_image_id, storage_id, repository=REPO, username=ADMIN_ACCESS_USER):

test/testconfig.py

@@ -24,7 +24,8 @@ class TestConfig(DefaultConfig):
 
   DB_TRANSACTION_FACTORY = create_transaction
 
-  STORAGE_TYPE = 'FakeStorage'
+  DISTRIBUTED_STORAGE_CONFIG = {'local_us': ['FakeStorage']}
+  DISTRIBUTED_STORAGE_PREFERENCE = ['local_us']
 
   BUILDLOGS_MODULE_AND_CLASS = ('test.testlogs', 'testlogs.TestBuildLogs')
   BUILDLOGS_OPTIONS = ['devtable', 'building', 'deadbeef-dead-beef-dead-beefdeadbeef']