| # Copyright 2013 The Chromium Authors. All rights reserved. |
| # Use of this source code is governed by a BSD-style license that can be |
| # found in the LICENSE file. |
| |
| from compiled_file_system import Unicode |
| from extensions_paths import ( |
| API_FEATURES, JSON_TEMPLATES, MANIFEST_FEATURES, PERMISSION_FEATURES) |
| import features_utility |
| from future import Gettable, Future |
| from third_party.json_schema_compiler.json_parse import Parse |
| |
| |
| def _AddPlatformsFromDependencies(feature, |
| api_features, |
| manifest_features, |
| permission_features): |
| features_map = { |
| 'api': api_features, |
| 'manifest': manifest_features, |
| 'permission': permission_features, |
| } |
| dependencies = feature.get('dependencies') |
| if dependencies is None: |
| return ['apps', 'extensions'] |
| platforms = set() |
| for dependency in dependencies: |
| dep_type, dep_name = dependency.split(':') |
| dependency_features = features_map[dep_type] |
| dependency_feature = dependency_features.get(dep_name) |
| # If the dependency can't be resolved, it is inaccessible and therefore |
| # so is this feature. |
| if dependency_feature is None: |
| return [] |
| platforms = platforms.union(dependency_feature['platforms']) |
| feature['platforms'] = list(platforms) |
| |
| |
| class _FeaturesCache(object): |
| def __init__(self, file_system, compiled_fs_factory, *json_paths): |
| self._cache = compiled_fs_factory.Create( |
| file_system, self._CreateCache, type(self)) |
| self._text_cache = compiled_fs_factory.ForUnicode(file_system) |
| self._json_path = json_paths[0] |
| self._extra_paths = json_paths[1:] |
| |
| @Unicode |
| def _CreateCache(self, _, features_json): |
| extra_path_futures = [self._text_cache.GetFromFile(path) |
| for path in self._extra_paths] |
| features = features_utility.Parse(Parse(features_json)) |
| for path_future in extra_path_futures: |
| extra_json = path_future.Get() |
| features = features_utility.MergedWith( |
| features_utility.Parse(Parse(extra_json)), features) |
| return features |
| |
| def GetFeatures(self): |
| if self._json_path is None: |
| return Future(value={}) |
| return self._cache.GetFromFile(self._json_path) |
| |
| |
| class FeaturesBundle(object): |
| '''Provides access to properties of API, Manifest, and Permission features. |
| ''' |
| def __init__(self, file_system, compiled_fs_factory, object_store_creator): |
| self._api_cache = _FeaturesCache( |
| file_system, |
| compiled_fs_factory, |
| API_FEATURES) |
| self._manifest_cache = _FeaturesCache( |
| file_system, |
| compiled_fs_factory, |
| MANIFEST_FEATURES, |
| '%s/manifest.json' % JSON_TEMPLATES) |
| self._permission_cache = _FeaturesCache( |
| file_system, |
| compiled_fs_factory, |
| PERMISSION_FEATURES, |
| '%s/permissions.json' % JSON_TEMPLATES) |
| self._object_store = object_store_creator.Create(_FeaturesCache, 'features') |
| |
| def GetPermissionFeatures(self): |
| return self._permission_cache.GetFeatures() |
| |
| def GetManifestFeatures(self): |
| return self._manifest_cache.GetFeatures() |
| |
| def GetAPIFeatures(self): |
| api_features = self._object_store.Get('api_features').Get() |
| if api_features is not None: |
| return Future(value=api_features) |
| |
| api_features_future = self._api_cache.GetFeatures() |
| manifest_features_future = self._manifest_cache.GetFeatures() |
| permission_features_future = self._permission_cache.GetFeatures() |
| def resolve(): |
| api_features = api_features_future.Get() |
| manifest_features = manifest_features_future.Get() |
| permission_features = permission_features_future.Get() |
| # TODO(rockot): Handle inter-API dependencies more gracefully. |
| # Not yet a problem because there is only one such case (windows -> tabs). |
| # If we don't store this value before annotating platforms, inter-API |
| # dependencies will lead to infinite recursion. |
| for feature in api_features.itervalues(): |
| _AddPlatformsFromDependencies( |
| feature, api_features, manifest_features, permission_features) |
| self._object_store.Set('api_features', api_features) |
| return api_features |
| return Future(delegate=Gettable(resolve)) |