Micro Frontend base plugin for Tutor

This plugin makes it possible to easily add micro frontend (MFE) applications on top of an Open edX platform that runs with Tutor. To learn more about MFEs, please check the official Open edX documentation.

In addition, this plugin comes with a few MFEs which are enabled by default:

Instructions for using each of these MFEs are given below.

Installation

tutor plugins install mfe

Usage

To enable this plugin, run:

tutor plugins enable mfe
tutor local launch

When running the plugin in production, it is recommended that you set up a catch-all CNAME for subdomains at the DNS provider: see the Configuring DNS Records section in the Tutor documentation for more details. This way, the plugin will work out of the box with no additional configuration. Which is to say, if your LMS_HOST is set to myopenedx.com the MFEs this plugin provides will be accessible under apps.myopenedx.com by default.

To check what the current value of MFE_HOST is actually set to, run:

tutor config printvalue MFE_HOST

Authn

This is a micro-frontend application responsible for the login, registration and password reset functionality.

Account

An MFE to manage account-specific information for every LMS user. Each user's account page is available at http(s)://{{ MFE_HOST }}/account. For instance, when running locally: https://apps.local.edly.io/account.

Communications

The Communications micro-frontend exposes an interface for course teams to communicate with learners. It achieves this by allowing instructors to send out emails in bulk, either by scheduling them or on demand.

Course Authoring

This MFE is meant for course authors and maintainers. For a given course, it exposes a "Pages & Resources" menu in Studio where one can enable or disable a variety of features, including, for example, the Wiki and Discussions. Optionally, it allows authors to replace the legacy HTML, Video, and Problem authoring tools with experimental React-based versions, as well as exposing a new proctoring interface that can be enabled if the edx-exams service is available.

Discussions

The Discussions MFE updates the previous discussions UI with a new look and better features.

Gradebook

This instructor-only MFE is for viewing individual and aggregated grade results for a course. To access this MFE, go to a course → Instructor tab → Student Admin → View gradebook. The URL should be: http(s)://{{ MFE_HOST }}/gradebook/{{ course ID }}. When running locally, the gradebook of the demo course is available at: http://apps.local.edly.io/gradebook/course-v1:edX+DemoX+Demo_Course

Learner Dashboard

The Learner Dashboard MFE provides a clean and functional interface to allow learners to view all of their open enrollments, as well as take relevant actions on those enrollments.

Learning

The Learning MFE replaces the former courseware, which is the core part of the LMS where students follow courses.

ORA Grading

When enabled, Open Response Assessments ("ORA") that have a staff grading step will link to this new MFE, either when clicking "Grade Available Responses" from the exercise itself, or via a link in the Instructor Dashboard. It is meant to streamline the grading process with better previews of submitted content.

Profile

Edit and display user-specific profile information. The profile page of every user is visible at http(s)://{{ MFE_HOST }}/profile/u/{{ username }}. For instance, when running locally, the profile page of the "admin" user is: http://apps.local.edly.io/profile/u/admin.

MFE management

Adding new MFEs

⚠️ Warnings

As of Tutor v16 (Palm release) it is no longer possible to add new MFEs by creating *_MFE_APP settings. Instead, users must implement the approach described below.
As of Tutor v17 (Quince release) you must make sure that the git URL of your MFE repository ends with .git. Otherwise the plugin build will fail.

Other MFE developers can take advantage of this plugin to deploy their own MFEs. To declare a new MFE, create a Tutor plugin and add your MFE configuration to the tutormfe.hooks.MFE_APPS filter. This configuration should include the name, git repository (and optionally: git branch or tag) and development port. For example:

from tutormfe.hooks import MFE_APPS

@MFE_APPS.add()
def _add_my_mfe(mfes):
    mfes["mymfe"] = {
        "repository": "https://github.com/myorg/mymfe.git",
        "port": 2001,
        "version": "me/my-custom-branch-or-tag", # optional, will default to the Open edX current tag.
    }
    return mfes

The MFE assets will then be bundled in the "mfe" Docker image whenever it is rebuilt with tutor images build mfe.

Assets will be served at http(s)://{{ MFE_HOST }}/mymfe. Developers are free to add extra template patches to their plugins, as usual: for instance LMS setting patches to make sure that the LMS correctly connects to the MFEs.

Disabling individual MFEs

To disable an existing MFE, remove the corresponding entry from the MFE_APPS filter. For instance, to disable some of the MFEs that ship with this plugin:

@MFE_APPS.add()
def _remove_some_my_mfe(mfes):
    mfes.pop("account")
    mfes.pop("profile")
    return mfes

Adding custom translations to your MFEs

This plugin makes it possible to change existing and add new translation strings to MFEs. Here is how to do it:

Identify the ID of the string you would like to translate. For instance, the ID of the "Account Information" string in the account MFE is "account.settings.section.account.information" (see source).
Create a folder and i18n file corresponding to your MFE app and language in the Tutor root. This location of this file should be /path/to/tutor/env/plugins/mfe/build/mfe/i18n/<app name>/<language code>.json. For instance, to add French ("fr") translation strings to the account MFE, run:
```
cd "$(tutor config printroot)/env/plugins/mfe/build/mfe/i18n/"
mkdir account
touch account/fr.json
```
Add your entries to this file in JSON format, where the key is the string ID and the value is the actual string. For instance:
```
{
  "account.settings.section.account.information": "Information du compte"
}
```
Rebuild the MFE image and restart the MFE with:
```
tutor images build mfe
tutor local start -d
```

Your custom translation strings should now appear in your app.

Customising MFEs

To change the MFEs logos from the default to your own logos, override the corresponding settings in the MFEs environment using patches mfe-lms-production-settings and mfe-lms-development-settings. For example, using the following plugin:

from tutor import hooks

hooks.Filters.ENV_PATCHES.add_items(
    [
        (
            "mfe-lms-development-settings",
            """
    MFE_CONFIG["LOGO_URL"] = "<URL>/logo.svg"
    MFE_CONFIG["LOGO_TRADEMARK_URL"] = "<URL>/logo-trademark.svg"
    MFE_CONFIG["LOGO_WHITE_URL"] = "<URL>/logo-white.svg"
    MFE_CONFIG["FAVICON_URL"] = "<URL>/favicon.ico"
    """
        ),
        (
            "mfe-lms-production-settings",
            """
    MFE_CONFIG["LOGO_URL"] = "<URL>/logo.svg"
    MFE_CONFIG["LOGO_TRADEMARK_URL"] = "<URL>/logo-trademark.svg"
    MFE_CONFIG["LOGO_WHITE_URL"] = "<URL>/logo-white.svg"
    MFE_CONFIG["FAVICON_URL"] = "<URL>/favicon.ico"
    """
        ),
    ]
)

If patches are the same in development and production, they can be replaced by a single mfe-lms-common-settings patch.

To install custom components for the MFEs, such as the header and footer, override the components by adding a patch to mfe-dockerfile-post-npm-install in your plugin:

from tutor import hooks

hooks.Filters.ENV_PATCHES.add_item(
    (
        "mfe-dockerfile-post-npm-install",
        """
# npm package
RUN npm install '@edx/frontend-component-header@npm:@edx/frontend-component-header-edx@latest'
# git repository
RUN npm install '@edx/frontend-component-footer@git+https://github.com/edx/frontend-component-footer-edx.git'
"""
    )
)

The same applies to installing a custom brand package:

hooks.Filters.ENV_PATCHES.add_item(
    (
        "mfe-dockerfile-post-npm-install",
        """
RUN npm install '@edx/brand@git+https://github.com/edx/brand-edx.org.git'
"""
    )
)

In both cases above, the npm commands affect every MFE being built. If you want have different commands apply to different MFEs, you can add one or more patches to mfe-dockerfile-post-npm-install-* instead. For instance, you could install one particular version of the header to the Learning MFE by patching mfe-dockerfile-post-npm-install-learning, and another one to the ORA Grading MFE by patching mfe-dockerfile-post-npm-install-ora-grading:

hooks.Filters.ENV_PATCHES.add_items(
    [
        (
            "mfe-dockerfile-post-npm-install-learning",
            """
    RUN npm install '@edx/frontend-component-header@git+https://github.com/your-repo/frontend-component-header.git#your-branch'
    """
        ),
        (
            "mfe-dockerfile-post-npm-install-ora-grading",
            """
    RUN npm install '@edx/frontend-component-header@git+https://github.com/your-repo/frontend-component-header.git#your-other-branch'
    """
        ),
    ]
)

In case you need to run additional instructions just before the build step you can use the mfe-dockerfile-pre-npm-build or mfe-dockerfile-pre-npm-build-* patches. For example, you may want to override existing env variables or define new ones.

from tutor import hooks

hooks.Filters.ENV_PATCHES.add_items(
    [
        (
            "mfe-dockerfile-pre-npm-build",
            """
ENV ENABLE_NEW_RELIC=true
ENV NEW_RELIC_ACCOUNT_ID="111111"
ENV NEW_RELIC_AGENT_ID="2222222222"
ENV NEW_RELIC_TRUST_KEY="333333"
ENV NEW_RELIC_LICENSE_KEY="4444444444"
ENV NEW_RELIC_APP_ID="5555555555"
"""
        ),
        # Only for the learning MFE
        (
            "mfe-dockerfile-pre-npm-build-learning",
            """ENV CUSTOM_VAR="custom-value"
            """
        ),
    ]
)

You can find more patches in the patch catalog below.

Installing from a private npm registry

In case you need to install components from a private NPM registry, you can append the --registry option to your install statement or add a npm config set command to the plugin. In some cases, for example when using GitLab's NPM package registry, you might also need to provide a token for your registry, which can be done with an additional npm config set command as well:

from tutor import hooks

hooks.Filters.ENV_PATCHES.add_item(
    (
        "mfe-dockerfile-post-npm-install",
        """
RUN npm config set @foo:registry https://gitlab.example.com/api/v4/projects/<your_project_id>/packages/npm/
RUN npm config set '//gitlab.example.com/api/v4/projects/<your_project_id>/packages/npm/:_authToken' '<your_token>'
RUN npm install '@edx/frontend-component-header@npm:@foo/<your_frontend_component_header_name>@latest'
"""
    )
)

MFE development

Tutor makes it possible to run any MFE in development mode. For instance, to run the "profile" MFE:

tutor dev start profile

Then, access http://apps.local.edly.io:1995/profile/u/YOURUSERNAME

You can also bind-mount your own fork of an MFE. For example:

tutor mounts add /path/to/frontend-app-profile
tutor dev launch

Note

The name of the bind-mount folder needs to match the name of the repository word-for-word. If you've forked an MFE repository with a custom name, be sure to change the name back to ensure the bind-mount works properly.

With this change, the "profile-dev" image will be automatically re-built during launch. Your host repository will then be bind-mounted at runtime in the "profile" container. This means that changes you make to the host repository will be automatically picked up and hot-reloaded by your development server.

This works for custom MFEs, as well. For example, if you added your own MFE named frontend-app-myapp, then you can bind-mount it like so:

tutor mounts add /path/to/frontend-app-myapp

Similarly, in production, the "mfe" Docker image will be rebuilt automatically during tutor local launch.

Note

Docker tries to run as many build processes in parallel as possible, but this can cause failures in the MFE image build. If you're running into OOM issues, RAM starvation, or network failures during NPM installs, try the following before restarting:

cat >buildkitd.toml <<EOF
[worker.oci]
  max-parallelism = 1
EOF
docker buildx create --use --name=singlecpu --config=./buildkitd.toml

Uninstall

To disable this plugin run:

tutor plugins disable mfe

You will also have to manually remove a few settings:

# MFE account
tutor local run lms ./manage.py lms waffle_delete --flags account.redirect_to_microfrontend

# MFE profile
tutor local run lms ./manage.py lms waffle_delete --flags learner_profile.redirect_to_microfrontend
tutor local run lms ./manage.py lms waffle_delete --flags discussions.pages_and_resources_mfe
tutor local run lms ./manage.py lms waffle_delete --flags new_core_editors.use_new_text_editor
tutor local run lms ./manage.py lms waffle_delete --flags new_core_editors.use_new_video_editor
tutor local run lms ./manage.py lms waffle_delete --flags new_core_editors.use_new_problem_editor
tutor local run lms site-configuration unset ENABLE_PROFILE_MICROFRONTEND

# MFE discussions
tutor local run lms ./manage.py lms waffle_delete --flags discussions.enable_discussions_mfe
tutor local run lms ./manage.py lms waffle_delete --flags discussions.enable_learners_tab_in_discussions_mfe
tutor local run lms ./manage.py lms waffle_delete --flags discussions.enable_moderation_reason_codes
tutor local run lms ./manage.py lms waffle_delete --flags discussions.enable_reported_content_email_notifications
tutor local run lms ./manage.py lms waffle_delete --flags discussions.enable_learners_stats

# MFE ora-grading
tutor local run lms ./manage.py lms waffle_delete --flags openresponseassessment.enhanced_staff_grader

Finally, restart the platform with:

tutor local launch

Template patch catalog

This is the list of all patches used across tutor-mfe (outside of any plugin). Alternatively, you can search for patches in tutor-mfe templates by grepping the source code:

git clone https://github.com/overhangio/tutor-mfe
cd tutor-mfe
git grep "{{ patch" -- tutormfe/templates

mfe-lms-development-settings

Python-formatted LMS settings in development. Values defined here override the values from mfe-lms-common-settings or mfe-lms-production-settings. For an example on the usage of this patch, check out this section.

File changed: apps/openedx/settings/lms/development.py

mfe-lms-production-settings

Python-formatted LMS settings in production. Values defined here override the values from mfe-lms-common-settings. For an example on the usage of this patch, check out this section.

File changed: apps/openedx/settings/lms/production.py

mfe-lms-common-settings

Python-formatted LMS settings used both in production and development.

File changed: apps/openedx/settings/partials/common_lms.py

mfe-webpack-dev-config

Add any configurations at the end of the development webpack config file in Javascript format.

File changed: tutormfe/templates/mfe/apps/mfe/webpack.dev-tutor.config.js