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Notes on ES2015 transition:

The application was migrated from using Bower, Grunt and requirejs to a structure following the ES2015 language specification, using npm to manage dependencies and webpack to build and bundle the application. The migration strategy was based on the "Treat everything like a method" option described by Ben McCormick.

Dependencies and prerequisites

  • Node and npm
  • An OpenSearch endpoint capable of receiving search queries and returning search results and related facets.

Dataset Search Services provides the OpenSearch endpoint in the NSIDC environment. See the DSS project to learn more about its dependencies, including Solr and Search Solr Tools. A local DSS, DSS running in a pre-production environment (e.g., integration, qa, or staging), or the production version of DSS may be used as the OpenSearch endpoint when running a local instance. See Configuration, below.

Git Workflow

Development on this project uses the GitHub Flow:

  1. Create your feature branch (git checkout -b my-new-feature)
  2. Stage your changes (git add)
  3. Commit your ESLint-compliant (npm run lint) and test-passing changes (npm test) with a good commit message (git commit)
  4. Push to the branch (git push -u origin my-new-feature)
  5. Create a new Pull Request

Installation

  1. Install node.js (Check out NVM if you need to move between versions of node for different projects.)

  2. Install node modules:

     npm install

Configuration

The Dataset Catalog Services endpoint is configured in src/config/appConfig.js. Caveat: The pre-production DSS instances aren't created with valid SSL certificates, so attempts to use those endpoints currently fail.

Running the Linter

Run once with npm run lint. Run automatically whenever a JavaScript file is changed with npm run lint:watch.

ESLint is configured in .eslintrc.json, a JSON file containing a list of options and allowed global variables.

Running a dev instance of the app

There are currently two ways to run a development instance of this app: running it locally or deploying to a developer Drupal instance. The ability to deploy to a developer VM directly using puppet has been deprecated and removed.

Running the App Locally

Run a local server instance at http://localhost:8080:

    npm start

By default, the local server will set the environment to development, and will use the production OpenSearch endpoints. See the OpenSearch endpoint configuration in src/config/appConfig.js.

Deploying to a developer Drupal VM

Note: As of August 2023 a bug associated with Drupal OS updates is preventing new VM builds.

Ansible and Garrison are used to deploy a new Drupal VM. The relevant repositories are:

  1. ansible_drupal_nsidc_org) Note that this project is hosted in a private, local git repository.

  2. If you need to modify the version of search-interface installed from npmjs.com: nsidc-drupal8, specifically file web/libraries/package.json.

Build steps:

  1. Check out the ansible_drupal_nsidc_org project.

  2. Get a copy of the Drupal database as described in the Ansible Drupal project README.md file.

  3. Follow the dev environment instructions in the "Deploy using garrison" section. The VM will be provisioned with the version of search-interface specified in the nsidc-drupal8 project staging branch, in file web/libraries/package.json.

  4. Access the application on the resulting VM at:

     http://dev.nsidc.org.docker-drupal8.USERNAME.dev.int.nsidc.org/data/search

    Replace USERNAME with your LDAP username. Note that on the dev VM, some external images may not render.

Building a developer Drupal VM with a different npmjs.com version of search-interface

If you've published a new version of search-interface to npmjs.com and want to build a Drupal VM using that new version, create a temporary branch in the nsidc-drupal8 project and modify the web/libraries/package.json file to specify your desired version. Commit the branch changes. Then change the Deploy using garrison step in the VM build process that looks like:

vagrant nsidc ssh --no-tty --env=dev -c "/vagrant/local_garrison.sh -e staging -r staging"

to instead use your branch name:

vagrant nsidc ssh --no-tty --env=dev -c "/vagrant/local_garrison.sh -e my-new-branch -r my-new-branch"

Note that this option is for testing search-interface changes that have been published to npmjs.com. See the next section if you need to test search-interface changes that have not yet been published to npmjs.com.

Redeploying to an existing developer Drupal VM

If you want to deploy a work-in-progress search-interface package to an existing dev Drupal VM, copy the index.bundle.js file to your dev Drupal machine as described below.

# Update the contents of search-interface/dist
cd /path-to-your-workspace/search-interface
npm run build # Or npm run build:dev if you want source maps for debugging

# Copy the updated index.bundle.js. Also copy the source map file, if you did
# "npm run build:dev" in the step above.
cd /path-to-your-workspace/ansible_drupal_nsidc_org
scp /path-to-your-workspace/search-interface/dist/index.bundle.js dev.nsidc.org.docker-drupal8.USERNAME.dev.int.nsidc.org:/home/vagrant/drupal/web/libraries/node_modules/@nsidc/search-interface/dist/index.bundle.js

vagrant nsidc ssh --no-tty --env=dev -c "cd /home/vagrant/drupal; lando drush cache:rebuild"

NOTE: The last step may not strictly be necessary, but if copying the file doesn't cause the application to be updated, the lando drush... should refresh everything.

Unit Tests

Prior to the ES2015 update, unit tests were implemented using a grunt task, Karma, and a HeadlessChrome environment. A few unit tests have already been migrated to Jest, and are explicitly executed via the Test configuration in .circleci/config.yml and the test and test:watch script definitions in package.json. The remaining tests are now obsolete and need to be migrated to Jest. See Jira stories PSS-460 for some history and SRCH-76 for proposed work.

Acceptance Tests (currently not usable)

TODO: Migrate from Ruby-based tests to JS-based acceptance tests if possible, and replace outdated grunt tasks with npm tasks to run the acceptance test suite. The tests themselves haven't been updated to the ES2015 language specification, and are currently not usable. See Jira stories SRCH-73 and related stories SRCH-41, SRCH-50.

Prerequisites

The acceptance tests use the official Ruby implementation of Cucumber, and we use the tool RuboCop to lint the Ruby code contained within this project. After installing the gems listed in Gemfile with bundle install, RuboCop can be run with bundle exec rubocop. Settings can be found in .rubocop.yml.

  • Firefox
  • If using the development VM under Mac OS X, XQuartz is required.

To run the acceptance tests on your machine from the development VM, you will first need to ssh with X windowing enabled. Instead of connecting with vagrant ssh, use ssh -X vagrant@127.0.0.1 -p 2222.

grunt test:acceptance --project=arctic-data-explorer --environment=integration

project can be arctic-data-explorer or nsidc_search

environment can be integration, qa, or staging.

The URL used by Cucumber is built from project and environment. To test against a different URL (like when running the tests locally), specify with a --url flag (project must still be specified):

grunt test:acceptance --url=http://localhost:8081 --project=arctic-data-explorer

Continuous Integration

CircleCI is configured to run eslint and tests automatically when changes are committed to the repository. See the configuration in .circleci/config.yml

Running CircleCI locally

You can run the CircleCI job(s) in your local workspace to confirm all steps pass before committing any changes. The steps are:

  • Install the CircleCI CLI.
  • Ensure Docker is running.
  • circleci config process .circleci/config.yml > process.yml
  • circleci local execute -c process.yml test

See The CircleCI documentation for more information.

Releasing a New Version

Tl;dr: Adding a version tag to a branch in the format vNN.NN.NNN (or vNN.NN.NN-rc.NN, in the case of release candidates) will package and publish that commit to npmjs.com!

See also Version Handling below.

In brief, the steps are:

  1. Confirm all tests pass, and that all changes have been committed and pushed to origin. Include a CHANGELOG entry with the text Unreleased instead of a version number and date.

  2. Merge the feature branch into the main branch. Update your local working directory.

     git checkout main && git pull

  3. Bump the desired semver field (major, minor, patch), tag the main branch with the updated version number, and push changes to origin.

     npm run release -- [major | minor | patch ]

    NOTE: Mac Users - Make sure you are using a GNU-compliant version of sed

Version Handling

Versions should follow Semantic Versioning guidelines. Adding a version tag to a branch in the format vNN.NN.NNN (or vNN.NN.NN-rc.NN, in the case of release candidates) will package and publish that commit to npmjs.com.

Tagging release candidates

Note: The naming structure for the prerelease scripts (setup:prerelease and bump:prerelease) are intentional in order to avoid unnecessarily triggering the release script.

   $ npm run setup:prerelease # Adds an initial pre-release tag to the current branch (e.g. v3.3.0-rc.0)
                              # Does not tag the branch. You'll need to push changes to git after running this step.
   $ npm run bump:prerelease # Bumps the prerelease number (e.g. 3.3.0-rc.1) and tags the branch.

Running npm run bump:prerelease will tag the current branch with an updated release candidate version, the tag will be pushed to origin (via the postversion trigger), and CircleCI will build and publish a new package to npmjs.

Tagging releases

To add a release tag (no -rc.N suffix):

    npm run release -- [major | minor | patch ]

The release script noted above is a shortcut for the built-in npm version command. Note the -- (two dashes surrounded by spaces) before the level specification. You can also do:

    npm version [major | minor | patch ]

npm run release -- ... will tag the current branch, the tag will be pushed to origin (via the postversion trigger), and CircleCI will build and publish a new package to npmjs.

Deploying to staging and production Drupal

At a minimum, developers will need to create a PCT when a new version is deployed to npmjs.com. Depending on the changes, a pull request may also need to be submitted to update files in nsidc-drupal8 (e.g. web/libraries/package.json).

Miscellaneous Development Notes

CSS / Sass

  • The structure of our Sass code is as follows:
    • src/sass
      • _config_*.scss
        • contains different variable definitions to separate styles across projects built from the common codebase
      • *_main.scss
        • imports the configuration and modules for that project
      • modules/
        • a Sass module defines the styling for a specific part of the page; keeping our code more modular makes it easier to identify places where it can be shared across projects, and makes it easier to find a particular selector you are interested in modifying or investigating
      • utilities/
        • our own custom Sass functions; no CSS rules are defined in here
      • junk/
        • old, monolithic CSS files converted to Sass syntax still needing cleanup (break into smaller parts, put those parts in modules/)
  • grunt sass:dev generates src/css/ade-search.css and src/css/nsidc-search.css, combining the project-specific scss and the common files into one
  • grunt sass:$PROJECT generates tmp/css/$PROJECT-search.css; this is used by grunt build:$PROJECT (see the Build section)
  • grunt sass is configured to compress the generated CSS files and generate source maps, allowing tools like the Chrome Inspector to automatically show line numbers from the original Sass files
  • grunt scsslint runs the scss-lint tool on the Sass files. It is configured by rules in config/scss-lint.yml (with additional rules that should be cleaned up in config/scsslint-todo.yml)

Node "circular dependency" warnings

When running some of the Grunt tasks, you may see some warning output like:

(node:29680) Warning: Accessing non-existent property 'cat' of module exports inside circular dependency
(Use `node --trace-warnings ...` to show where the warning was created)
(node:29680) Warning: Accessing non-existent property 'cd' of module exports inside circular dependency
(node:29680) Warning: Accessing non-existent property 'chmod' of module exports inside circular dependency
(node:29680) Warning: Accessing non-existent property 'cp' of module exports inside circular dependency

This is apparently being emitted by the shelljs package in the Node 14+ context. To see more details and confirm the source set the NODE_OPTIONS environment variable to include --trace-warnings. For example:

NODE_OPTIONS="--trace-warnings" grunt test:unit

Xvnc password failure in acceptance tests

If acceptance tests are failing with a warning about an invalid Xvnc password, run vncpasswd on the machine running the tests and set a dummy password (password value doesn't matter).

A Tale of Exports and Imports

Apparently NodeJS has added a new thing in package.json called "exports". A package author can use this section to declare what things are exported for use, and a map to where they are located in the package directory.

Webpack 5 now enforces this--if you attempt to import something which is not declared as exported from the package it is in, the import will fail. A package which omits the "exports" section defaults to everything being exported / importable. A package which includes the "exports" section only exports things listed, nothing else.

This has the following side-effect:

  • Your code imports "foo" from package X
  • Your code imports "bar" from package Y
  • Package X has no "exports" section because the author(s) didn't know about this new feature
  • Package Y does have an exports section, but it does not export "bar" (possibly because they didn't understand this new feature)
  • Using webpack 4 is no problem, both imports work
  • Upgrading to webpack to v5 results in the import of "foo" succeeding and the import of "bar" failing

In our case we were successfully importing CSS from vanillajs-datepicker, but when upgrading webpack to v5, the build started raising a new error indicating that the CSS could not be imported because the package (vanillajs-datepicker) did not export it.

A workaround in the webpack config which bypasses the export / import rules:

resolve: {
  alias: {
    'vjs-datepicker': path.resolve(__dirname, 'node_modules/vanillajs-datepicker/dist/css')
  }
}

which allows the import of this form to work (currently used in TemporalCoverageView):

import 'vjs-datepicker/datepicker-bs4.css';

If / when the vanillajs-datepicker package updates their exports to export this CSS, we can change the import back to:

import 'vanillajs-datepicker/dist/css/datepicker-bs4.css';