Mozilla Experimenter

Experimenter is a platform for managing experiments in Mozilla Firefox.

Important Links

Installation

General Setup

1. Install docker on your machine

• On linux, setup docker to run as non-root

1. Clone the repo

   git clone <your fork>
   

2. Copy the sample env file

   cp .env.sample .env
   

3. Set DEBUG=True for local development

   vi .env
   

4. Create a new secret key and put it in .env

   make secretkey
   

5. Run tests

   make test
   

6. Setup the database

   make refresh
   

Fully Dockerized Setup (continuation from General Setup 1-7)

1. Run a dev instance

   make up
   

2. Navigate to it and add an SSL exception to your browser

   https://localhost/
   

Semi Dockerized Setup (continuation from General Setup 1-7)

One might choose the semi dockerized approach for:

1. faster startup/teardown time (not having to rebuild/start/stop containers)
2. better ide integration

Notes:

• Node ^14.0.0 is required

• osx catalina, reinstall command line tools

• poetry

Semi Dockerized Setup

1. Pre reqs (macOs instructions)

   brew install postgresql llvm openssl yarn
   
   echo 'export PATH="/usr/local/opt/llvm/bin:$PATH"' >> ~/.bash_profile
   export LIBRARY_PATH=$LIBRARY_PATH:/usr/local/opt/openssl/lib/
   

2. Install dependencies

   source .env
   
   poetry install (cd into app)
   
   yarn install
   

3. env values

   .env (set at root):
   DEBUG=True
   DB_HOST=localhost
   HOSTNAME=localhost
   

4. Start postgresql, redis, autograph, kinto

   make up_db
   

5. Django app

   # in app
   
   poetry shell
   
   yarn workspace @experimenter/nimbus-ui build
   yarn workspace @experimenter/core build
   ./manage.py runserver 0.0.0.0:7001
   

Pro-tip: we have had at least one large code refactor. You can ignore specific large commits when blaming by setting the Git config's ignoreRevsFile to .git-blame-ignore-revs:

git config blame.ignoreRevsFile .git-blame-ignore-revs

Google Credentials

On certain pages an API endpoint is called to receive experiment analysis data from Jetstream to display visualization tables. To see experiment visualization data, you must provide GCP credentials.

1. Generate a GCP private key file.

• Ask in #experimenter for the GCP link to create a new key file.
• Add Key > Create New Key > JSON > save this file.
• Do not lose or share this file. It's unique to you and you'll only get it once.

2. Rename the file to google-credentials.json and place it anywhere inside the /app directory.
3. Update your .env so that GOOGLE_APPLICATION_CREDENTIALS points to this file. If your file is inside the /app directory it would look like this:

   GOOGLE_APPLICATION_CREDENTIALS=/app/google-credentials.json
   

Usage

Experimenter uses docker for all development, testing, and deployment.

The following helpful commands have been provided via a Makefile:

build

Build the application container by executing the build script

compose_build

Build the supporting services (nginx, postgresql) defined in the compose file

up

Start a dev server listening on port 80 using the Django runserver

up_db

Start postgresql, redis, autograph, kinto on their respective ports to allow running the Django runserver and yarn watchers locally (non containerized)

up_django

Start Django runserver, Celery worker, postgresql, redis, autograph, kinto on their respective ports to allow running the yarn watchers locally (non containerized)

up_detached

Start all containers in the background (not attached to shell)

check

Run all test and lint suites, this is run in CI on all PRs and deploys

py_test

Run python tests

migrate

Apply all django migrations

load_locales_countries

Populates locales and countries

load_dummy_experiments

Populates db with dummy experiments

bash

Start a bash shell inside the container (this lets you interact with the containerized filesystem and run Django management commands)

ssl

Create dummy SSL certs to use the dev server over a locally secure connection. This helps test client behaviour with a secure connection. This task is run automatically when needed.

kill

Stop and delete all docker containers. WARNING: this will remove your database and all data. Use this to reset your dev environment.

refresh

Run kill, migrate, load_locales_countries load_dummy_experiments

integration_test

Run the integration test suite inside a containerized instance of Firefox. You must also be already running a make up dev instance in another shell to run the integration tests.

integration_vnc_up

Start a linux VM container with VNC available over vnc://localhost:5900 with password secret. Right click on the desktop and select Applications > Shell > Bash and enter tox -c tests/integration/ to run the integration tests and watch them run in a Firefox instance you can watch and interact with.

Frontend

Experimenter has two front-end UIs:

• core is the legacy UI used for Experimenter intake which will remain until nimbus-ui supersedes it
• nimbus-ui is the Nimbus Console UI for Experimenter that is actively being developed

Learn more about the organization of these UIs here.

Also see the nimbus-ui README for relevent Nimbus documentation.

API

API documentation can be found here

Contributing

Please see our Contributing Guidelines

License

Experimenter uses the Mozilla Public License