{"action":"created","comment":{"url":"https://api.github.com/repos/edx/edx-platform/pulls/comments/30410239","id":30410239,"diff_hunk":"@@ -0,0 +1,72 @@\n+\"\"\"\n+Adds support for first class features that can be added to the edX platform.\n+\"\"\"\n+\n+from stevedore.extension import ExtensionManager\n+\n+# Stevedore extension point namespaces\n+FEATURE_NAMESPACE = 'openedx.feature'\n+COURSE_VIEW_TYPE_NAMESPACE = 'openedx.course_view_type'\n+\n+\n+class PluginError(Exception):\n+    \"\"\"\n+    Base Exception for when an error was found regarding features.\n+    \"\"\"\n+    pass\n+\n+\n+class PluginManager(object):\n+    \"\"\"\n+    Base class that manages plugins to the edX platform.\n+    \"\"\"\n+    @classmethod\n+    def get_available_plugins(cls):\n+        \"\"\"\n+        Returns a dict of all the plugins that have been made available through the platform.\n+        \"\"\"\n+        # Note: we're creating the extension manager lazily to ensure that the Python path\n+        # has been correctly set up. Trying to create this statically will fail, unfortunately.\n+        if not hasattr(cls, \"_plugins\"):\n+            plugins = {}\n+            extension_manager = ExtensionManager(namespace=cls.NAMESPACE)  # pylint: disable=no-member\n+            for plugin_name in extension_manager.names():\n+                plugins[plugin_name] = extension_manager[plugin_name].plugin\n+            cls._plugins = plugins\n+        return cls._plugins\n+\n+    @classmethod\n+    def get_plugin(cls, name):\n+        \"\"\"\n+        Returns the plugin with the given name.\n+        \"\"\"\n+        plugins = cls.get_available_plugins()\n+        if name not in plugins:\n+            raise PluginError(\"No such plugin {name} for entry point {namespace}\".format(\n+                name=name,\n+                namespace=cls.NAMESPACE  # pylint: disable=no-member\n+            ))\n+        return plugins[name]\n+\n+\n+class FeatureManager(PluginManager):\n+    \"\"\"\n+    Manager for all of the edX features that have been made available.\n+    \"\"\"\n+    NAMESPACE = FEATURE_NAMESPACE","path":"openedx/core/djangoapps/plugins/api.py","position":56,"original_position":56,"commit_id":"74eaa5a490010ea7dd55e4842b6d578c50523905","original_commit_id":"74eaa5a490010ea7dd55e4842b6d578c50523905","user":{"login":"cpennington","id":30236,"avatar_url":"https://avatars.githubusercontent.com/u/30236?v=3","gravatar_id":"","url":"https://api.github.com/users/cpennington","html_url":"https://github.com/cpennington","followers_url":"https://api.github.com/users/cpennington/followers","following_url":"https://api.github.com/users/cpennington/following{/other_user}","gists_url":"https://api.github.com/users/cpennington/gists{/gist_id}","starred_url":"https://api.github.com/users/cpennington/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/cpennington/subscriptions","organizations_url":"https://api.github.com/users/cpennington/orgs","repos_url":"https://api.github.com/users/cpennington/repos","events_url":"https://api.github.com/users/cpennington/events{/privacy}","received_events_url":"https://api.github.com/users/cpennington/received_events","type":"User","site_admin":false},"body":"What API does a `Feature` have to implement?","created_at":"2015-05-15T14:01:07Z","updated_at":"2015-05-15T14:01:07Z","html_url":"https://github.com/edx/edx-platform/pull/8015#discussion_r30410239","pull_request_url":"https://api.github.com/repos/edx/edx-platform/pulls/8015","_links":{"self":{"href":"https://api.github.com/repos/edx/edx-platform/pulls/comments/30410239"},"html":{"href":"https://github.com/edx/edx-platform/pull/8015#discussion_r30410239"},"pull_request":{"href":"https://api.github.com/repos/edx/edx-platform/pulls/8015"}}},"pull_request":{"url":"https://api.github.com/repos/edx/edx-platform/pulls/8015","id":35274696,"html_url":"https://github.com/edx/edx-platform/pull/8015","diff_url":"https://github.com/edx/edx-platform/pull/8015.diff","patch_url":"https://github.com/edx/edx-platform/pull/8015.patch","issue_url":"https://api.github.com/repos/edx/edx-platform/issues/8015","number":8015,"state":"open","locked":false,"title":"Add extensible course view types for edX platform","user":{"login":"andy-armstrong","id":5985072,"avatar_url":"https://avatars.githubusercontent.com/u/5985072?v=3","gravatar_id":"","url":"https://api.github.com/users/andy-armstrong","html_url":"https://github.com/andy-armstrong","followers_url":"https://api.github.com/users/andy-armstrong/followers","following_url":"https://api.github.com/users/andy-armstrong/following{/other_user}","gists_url":"https://api.github.com/users/andy-armstrong/gists{/gist_id}","starred_url":"https://api.github.com/users/andy-armstrong/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/andy-armstrong/subscriptions","organizations_url":"https://api.github.com/users/andy-armstrong/orgs","repos_url":"https://api.github.com/users/andy-armstrong/repos","events_url":"https://api.github.com/users/andy-armstrong/events{/privacy}","received_events_url":"https://api.github.com/users/andy-armstrong/received_events","type":"User","site_admin":false},"body":"This is the first step to supporting pluggable features in the edX platform. A new Stevedore \"course_view_type\" extension point is added, that allows any Django app to register a new view for the course. Currently, each course view is shown as a tab in the course, but a client is free to choose whether these are shown as tabs. In particular, on mobile there UX may not be represented as tabs.\r\n\r\nTo prove out this change, the following tabs have been converted to course views:\r\n - the \"Notes\" tab provided by Student Notes\r\n - the \"CCX\" tab for CCX administration\r\n - the \"Instructor\" tab that shows the dashboard\r\n\r\nSee this wiki page for the background:\r\n\r\nhttps://openedx.atlassian.net/wiki/display/AC/Feature+Plug-Ins+for+edX+Platform\r\n","created_at":"2015-05-12T21:50:53Z","updated_at":"2015-05-15T14:01:07Z","closed_at":null,"merged_at":null,"merge_commit_sha":"516cb67c2e7eff73162146db5fc7cf98cd39a9c3","assignee":null,"milestone":null,"commits_url":"https://api.github.com/repos/edx/edx-platform/pulls/8015/commits","review_comments_url":"https://api.github.com/repos/edx/edx-platform/pulls/8015/comments","review_comment_url":"https://api.github.com/repos/edx/edx-platform/pulls/comments{/number}","comments_url":"https://api.github.com/repos/edx/edx-platform/issues/8015/comments","statuses_url":"https://api.github.com/repos/edx/edx-platform/statuses/74eaa5a490010ea7dd55e4842b6d578c50523905","head":{"label":"edx:andya/add-tab-extensions","ref":"andya/add-tab-extensions","sha":"74eaa5a490010ea7dd55e4842b6d578c50523905","user":{"login":"edx","id":3179841,"avatar_url":"https://avatars.githubusercontent.com/u/3179841?v=3","gravatar_id":"","url":"https://api.github.com/users/edx","html_url":"https://github.com/edx","followers_url":"https://api.github.com/users/edx/followers","following_url":"https://api.github.com/users/edx/following{/other_user}","gists_url":"https://api.github.com/users/edx/gists{/gist_id}","starred_url":"https://api.github.com/users/edx/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/edx/subscriptions","organizations_url":"https://api.github.com/users/edx/orgs","repos_url":"https://api.github.com/users/edx/repos","events_url":"https://api.github.com/users/edx/events{/privacy}","received_events_url":"https://api.github.com/users/edx/received_events","type":"Organization","site_admin":false},"repo":{"id":10391073,"name":"edx-platform","full_name":"edx/edx-platform","owner":{"login":"edx","id":3179841,"avatar_url":"https://avatars.githubusercontent.com/u/3179841?v=3","gravatar_id":"","url":"https://api.github.com/users/edx","html_url":"https://github.com/edx","followers_url":"https://api.github.com/users/edx/followers","following_url":"https://api.github.com/users/edx/following{/other_user}","gists_url":"https://api.github.com/users/edx/gists{/gist_id}","starred_url":"https://api.github.com/users/edx/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/edx/subscriptions","organizations_url":"https://api.github.com/users/edx/orgs","repos_url":"https://api.github.com/users/edx/repos","events_url":"https://api.github.com/users/edx/events{/privacy}","received_events_url":"https://api.github.com/users/edx/received_events","type":"Organization","site_admin":false},"private":false,"html_url":"https://github.com/edx/edx-platform","description":"Open 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