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mitodl / mit-learn

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MIT Learn

CI Workflow

This application provides a central interface from which learners can browse MIT courses.

SECTIONS

  1. Initial Setup
  2. Code Generation
  3. Committing & Formatting
  4. Optional Setup

Initial Setup

MIT Learn follows the same initial setup steps outlined in the common OL web app guide. Run through those steps including the addition of /etc/hosts aliases and the optional step for running the createsuperuser command.

Configuration

Configuration can be put in the following files which are gitignored:

mit-learn/
  ├── env/
  │   ├── shared.local.env (provided to both frontend and backend containers)
  │   ├── frontend.local.env (provided only to frontend containers)
  │   └── backend.local.env (provided only to frontend containers)
  └── .env (legacy file)

The following settings must be configured before running the app:

Loading Data

The MIT Learn platform aggregates data from many sources. These data are populated by ETL (extract, transform, load) pipelines that run automatically on a regular schedule. Django management commands are also available to force the pipelines to run—particularly useful for local development.

To load data from xpro, for example, ensure you have the relevant environment variables

XPRO_CATALOG_API_URL
XPRO_COURSES_API_URL

and run

docker compose run --rm web python manage.py backpopulate_xpro_data

See learning_resources/management/commands and main/settings_course_etl.py for more ETL commands and their relevant environment variables.

Frontend Development

The frontend package root is at ./frontends. A watch container is provided to serve and rebuild the front end when there are changes to source files, which is started alongside backing services with docker compose up.

Package scripts are also provided for building and serving the frontend in isolation. More detail can be found in the Frontend README.

Code Generation

MIT Learn uses drf-spectacular to generate and OpenAPI spec from Django views. Additionally, we use OpenAPITools/openapi-generator to generate Typescript declarations and an API Client. These generated files are checked into source control; CI checks that they are up-to-date. To regenerate these files, run

./scripts/generate_openapi.sh

Committing & Formatting

To ensure commits to GitHub are safe, first install pre-commit:

pip install pre_commit
pre-commit install

Running pre-commit can confirm your commit is safe to be pushed to GitHub and correctly formatted:

pre-commit run --all-files

To automatically install precommit hooks when cloning a repo, you can run this:

git config --global init.templateDir ~/.git-template
pre-commit init-templatedir ~/.git-template

Launching a Codespace

There are times where you will want a live and shareable environment (validating UI changes with the design team, demoing a feature etc). You can launch a codespace on any branch or PR by clicking the green "code" button at the top right and launching a codespace from the codespaces tab. There are a few things to be aware of when provisioning a codespace:

When new environment variables are introduced to the main application, the codespace config should be updated as well:

At a bare minimum, a codespace should be able to build and run without requiring any configuration

Optional Setup

Described below are some setup steps that are not strictly necessary for running MIT Learn

Enabling email

The app is usable without email-sending capability, but there is a lot of app functionality that depends on it. The following variables will need to be set in your .env file - please reach out to a fellow developer or devops for the correct values.

MAILGUN_SENDER_DOMAIN
MAILGUN_URL
MAILGUN_KEY

Additionally, you'll need to set MAILGUN_RECIPIENT_OVERRIDE to your own email address so any emails sent from the app will be delivered to you.

Loading fixture files

Run the following to load platforms, departments, and offers. This populates the database with the fixture files contained in learning_resources/fixtures. Note that you will first need to run the Django models to schema migrations detailed in the Handbook Initial Setup step.

# Note!
# This is already done for you when bringing up your local (development)
# environment.
docker compose run --rm web python manage.py loaddata platforms departments offered_by

Enabling image uploads to S3

:warning: NOTE: Article cover image thumbnails will be broken unless this is configured :warning:

Article posts give users the option to upload a cover image, and we show a thumbnail for that image in post listings. We use Embedly to generate that thumbnail, so they will appear as broken images unless you configure your app to upload to S3. Steps:

  1. Set MITOL_USE_S3=True in .env

  2. Also in .env, set these AWS variables: AWS_ACCESS_KEY_ID, AWS_SECRET_ACCESS_KEY, AWS_STORAGE_BUCKET_NAME

    These values can be copied directly from the Open Discussions CI Heroku settings, or a fellow dev can provide them.

Enabling searching the course catalog on opensearch

To enable searching the course catalog on opensearch, run through these steps:

  1. Start the services with docker compose up
  2. With the above running, run this management command, which kicks off a celery task, to create an opensearch index: 
    docker compose  run web python manage.py recreate_index --all

    If there is an error running the above command, observe what traceback gets logged in the celery service.

  3. Once created and with docker compose up running, hit this endpoint in your browser to see if the index exists: http://localhost:9101/discussions_local_all_default/_search
  4. If yes, to run a specific query, make a POST request (using curl, Postman, Python requests, etc.) to the above endpoint with a json payload. For example, to search for all courses, run a query with Content-Type as application/json and with a body {"query":{"term":{"object_type":"course"}}}

Running OpenSearch as a multi-node local cluster

By default the configuration runs OpenSearch in single-node mode. If you'd like to run a 3-node cluster locally you can set the following environment variable in your shell.

export OPENSEARCH_CLUSTER_TYPE=cluster

You should make this permanent by using direnv or similar so that all your shell sessions are using the same docker compose config):

After setting this and running docker compose up you'll see this 3 node cluster be created. Note that the volumes used by these containers are separate from the volume used by the single-node setup so you will need to recreate your indicies. This is intentional and critical to being able to switch back and forth between single-node and cluster setups.

Running the app in a notebook

This repo includes a config for running a Jupyter notebook in a Docker container. This enables you to do in a Jupyter notebook anything you might otherwise do in a Django shell. To get started:

From there, you should be able to run code snippets with a live Django app just like you would in a Django shell.

Connecting with an OpenID Connect provider for authentication

The MIT Learn application relies on an OpenID Connect client provided by Keycloak for authentication.

The following environment variables must be defined using values from a Keycloak instance:

To login via the Keycloak client, open http://od.odl.local:8063/login/ol-oidc in your browser.

Additional details can be found at https://docs.google.com/document/d/17tJ-C2EwWoSpJWZKjuhMVgsqGtyPH0IN9KakXvSKU0M/edit

Configuring PostHog Support

The system can use PostHog to evaluate feature flags and record views for the Learning Resource drawer.

The following environment variables must be set for this support to work:

The keys and ID can be found in the Settings section of the project in PostHog that you're using for the app. The project key and ID are under "Project", and you can generate a personal API key under "User"->"Personal API Keys".

[!WARNING] Be careful with the API keys! The project API key is not secret and is sent in clear text with the frontend. The personal API key is secret. Don't mix them up.

Personal API keys only need read permission to Query. When creating a personal API key, choose "Read" under Query for Scopes. The key needs no other permissions (unless you need them for other things). Additionally, if you select either option besides "All-access" under "Organization & project access", make sure you assign the correct project/org to the API key.

Once these are set (and you've restarted the app), you should see events flowing into the PostHog dashboard.

GitHub Pages Storybook

Demos and documentation of reusable UI components in this repo are published as a storybook at https://mitodl.github.io/mit-learn/.