scratch-www

Standalone web client for Scratch

Where am I?

Physically? No idea.

Digitally? You’re at Scratch’s open source web client!

We’re working to update the Scratch website to use a new codebase, contained in this repository.

We’re currently building Scratch using React and SCSS. Here are some resources to help you get acquainted with how we’re working on the Scratch codebase:

• Style Guide
• Testing Guide
• Localization Guide
• Map of the repository

Before Getting Started

• Make sure you have node (v4.2 or higher) and npm installed We use npm (Node Package Manager) to maintain and update packages required to build the site.

Update Packages

It's important to make sure that all of the dependencies are up to date because the scratch-www code only works with specific versions of the dependencies. You can update the packages by running this command:

npm install

To Build

To compile the source code into HTML and JavaScript bundles browsers can read, run this command:

npm run build

If you want to run a server that rebuilds the files as you edit them, skip to the To Run section below.

Warnings during npm install

These warnings can be safely ignored:

npm WARN [email protected] requires a peer of react@^0.14.0 but none was installed.
npm WARN [email protected] requires a peer of react@^0.14.0 but none was installed.
npm WARN [email protected] requires a peer of redux@^2.0.0 || ^3.0.0 but none was installed.
npm WARN [email protected] requires a peer of react@^0.14.7 but none was installed.
npm WARN [email protected] requires a peer of react@^0.14.8 but none was installed.

These currently exist in static/js/lib

To Run

If you would like to create a temporary version of the site on your machine that you can access through your web browser run the command below. Building (see To Build above) is not necessary for this step and the temporary server can be turned off (see To Stop below).

The intl directory must be built separately with the npm run translate line below in order for the text to appear properly.

npm run translate
npm start

The site hosted on your local machine can now be accessed by a web browser by entering localhost:8333 into your web browser.

During development, npm start watches any update you make to files in either ./static or ./src and triggers a rebuild of the project. In development, the build is stored in memory, and not served from the ./build directory.

When running npm start, here are some important log messages to keep an eye out for:

• webpack: bundle is now VALID. – The bundle has been loaded into memory and is now viewable in the browser. This will show up both once npm start has completed its setup, and also once updates you make to files have been re-compiled for viewing in the browser.
• webpack: bundle is now INVALID. – If you see this, then it means you have made updates to files that are still being compiled for browser viewing. Pages will still be viewable, but they will not see any updates you made yet.

Once running, open http://localhost:8333 in your browser. If you wish to have the server reload automatically, you can install either nodemon or forever.

To stop

To stop the process that is making the site available to your web browser (created above in To Start) use ^C.

Configuration

npm start can be configured with the following environment variables

Variable	Default	Description
API_HOST	https://api.scratch.mit.edu	Hostname for API requests
ASSET_HOST	https://assets.scratch.mit.edu	Hostname for asset requests
BACKPACK_HOST	https://backpack.scratch.mit.edu	Hostname for backpack requests
PROJECT_HOST	https://projects.scratch.mit.edu	Hostname for project requests
SENTRY_DSN	''	DSN for Sentry
FALLBACK	''	Pass-through location for old site
GA_TRACKER	''	Where to log Google Analytics data
NODE_ENV	null	If not production, app acts like development
PORT	8333	Port for devserver (http://localhost:XXXX)

NOTE: Because by default API_HOST=https://api.scratch.mit.edu, please be aware that, by default, you will be seeing and interacting with real data on the Scratch website.

Unit Tests

To run:

npm test

This will build the application and run the unit and localization tests. Some of the tests are run using the TAP framework and others run using Jest.

Integration tests

We are transitioning from using TAP to using Jest as our testing framework so for the time being our tests run using both.

Running the tests

• By default, tests run against our Staging instance, but you can pass in a different location with the ROOT_URL environment variable (see below) if you want to run the tests against e.g. your local build

Running the tests

• Run all tests from the command-line: $ SMOKE_USERNAME=username SMOKE_PASSWORD=password ROOT_URL=https://scratch.mit.edu npm run test:integration
• To run a single file from the command-line using TAP: $ SMOKE_USERNAME=username SMOKE_PASSWORD=password ROOT_URL=https://scratch.mit.edu node_modules/.bin/tap ./test/integration-legacy/smoke-testing/filename.js --timeout=3600
  • The timeout var is for the length of the entire tap test-suite; if you are getting a timeout error, you may need to adjust this value (some of the Selenium tests take a while to run)
• To run a single file from the command-line using Jest: $ SMOKE_USERNAME=username SMOKE_PASSWORD=password ROOT_URL=https://scratch.mit.edu node_modules/.bin/jest ./test/integration/filename.test.js

Running Remote tests

• TAP tests can be run using Saucelabs, an online service that can test browser/os combinations remotely. Currently all tests are written for use for chrome on mac.
• You will need a Saucelabs account in order to use it for testing. To find the Access Key, click your username and select User Settings from the dropdown menu. Near the bottom of the page is your access key that you can copy and use in the command line.
• Currently Jest tests will not run with Saucelabs.
• To run tests using saucelabs run this command $ SMOKE_USERNAME=username SMOKE_PASSWORD=password SAUCE_USERNAME=saucelabsUsername SAUCE_ACCESS_KEY=saucelabsAccessKey ROOT_URL=https://scratch.mit.edu npm run test:integration:remote

Configuration

Variable	Default	Description
ROOT_URL	scratch.ly	Location you want to run the tests against
SMOKE_USERNAME	None	Username for Scratch user you're signing in with to test
SMOKE_PASSWORD	None	Password for Scratch user you're signing in with to test
SMOKE_REMOTE	false	Tests with Sauce Labs or not. True if running test:smoke:sauce
SMOKE_HEADLESS	false	Run browser in headless mode. Flaky at the moment
SAUCE_USERNAME	None	Username for your Sauce Labs account
SAUCE_ACCESS_KEY	None	Access Key for Sauce Labs found under User Settings

To Deploy

Deploying to staging or production will upload code to S3 and configure Fastly.

npm install
virtualenv ENV
. ENV/bin/activate
pip install -r requirements.txt
npm run build && npm run deploy

Variable	Default	Description
FASTLY_SERVICE_ID	''	Fastly service ID for bin/configure-fastly.js
FASTLY_API_KEY	''	Fastly API key for bin/configure-fastly.js
FASTLY_ACTIVATE_CHANGES	false	Activate changes and purge all after configuring
AWS_ACCESS_KEY_ID	''	AWS access key id for S3
AWS_SECRET_ACCESS_KEY	''	AWS secret access key for S3
S3_BUCKET_NAME	''	S3 bucket name to deploy into

Current issues with the development

We're currently in the process of transitioning into this web client from Scratch's existing structure. As we transition, there are going to be some issues along the way that relate to how this client needs to interact with the existing infrastructure to work properly in production.

FALLBACK

On top of migrating to using this as our web client, Scratch is also transitioning into using a new API backend, Scratch REST API. As that is also currently in development and incomplete, we are set up to fall back to using existing Scratch endpoints if an API endpoint does not exist – which is where the FALLBACK comes in.

Most of the issues we have currently revolve around the use of FALLBACK. This variable is used to specify what URL to fall back onto should a request fail within the context of this web client, or when using the API_HOST. If not specified in the process, it will not be used, and any request that is not made through the web client or the API will be unreachable.

Setting FALLBACK=https://scratch.mit.edu allows the web client to retrieve data from the Scratch website in your development environment. However, because of security concerns, trying to send data to Scratch through your development environment won't work. This means the following things will be broken for the time being:

• Login on the splash page (In the process of being fixed)
• Some update attempts to production data made through a development version of the web client

Additionally, if you set FALLBACK=https://scratch.mit.edu, be aware that clicking on links to parts of the website not yet migrated over (currently such as Explore, Discuss, Profile, etc.) will take you to the Scratch website itself.

Windows

Some users have experienced difficulties when trying to get our web client to work on Windows. One solution could be to use Cygwin. If that doesn't work, you might want to use Wubi (Windows XP, Vista, 7) or Wubiuefi (Windows 8 or higher). Wubi(uefi) is a Windows Installer for Ubuntu that allows you to have Ubuntu and Windows on one disk, without the need of an extra partition.