The web application front end for Model My Watershed.
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README.md

model-my-watershed

Local Development

A combination of Vagrant 1.6+ and Ansible 1.8+ is used to setup the development environment for this project. The project consists of the following virtual machines:

  • app
  • services
  • tiler
  • worker

The app virtual machine contains an instance of the Django application, services contains:

  • PostgreSQL
  • Pgweb
  • Redis
  • Logstash
  • Kibana
  • Graphite
  • Statsite

tiler contains:

  • Windshaft
  • Mapnik

worker contains:

  • Celery
  • Docker
  • Spark Job Server (container)

Getting Started

First, ensure that you have a set of Amazon Web Services (AWS) credentials with access to Azavea's pre-processed NLCD data set. This setup generally needs to happen on the virtual machine host using the AWS CLI:

$ aws configure --profile mmw-stg

Next, use the following command to bring up a local development environment:

$ MMW_ITSI_SECRET_KEY="***" vagrant up

The application will now be running at http://localhost:8000.

After significant changes, you may need to run the following two commands to apply database migrations and rebuild JavaScript assets:

$ ./scripts/manage.sh migrate
$ ./scripts/bundle.sh

To load or reload boundary data, from an app server, run (scripts is not mounted by default to the VM, you may need to copy the file over):

$ ./scripts/setupdb.sh -b

The same script can be used to load the stream network data:

$ ./scripts/setupdb.sh -s

Note that if you receive out of memory errors while loading the data, you may want to increase the RAM on your services VM (1512 MB may be all that is necessary).

See debug messages from the web app server:

$ ./scripts/debugserver.sh

Watch the JavaScript and SASS files for changes:

$ ./scripts/bundle.sh --debug --watch

When creating new JavaScript or SASS files, you may need to stop and restart the bundle script.

If you add a JS dependency and want it to be included in the vendor.js bundle, you will need to update the JS_DEPS array in bundle.sh accordingly.

If changes were made to the one of the VM's configuration or requirements since the last time you provisioned, you'll need to reprovision.

$ vagrant provision <VM name>

After provisioning is complete, you can execute Django management commands with:

$ ./scripts/manage.sh test

Note: If you get an error that resembles the following, try logging into the app virtual machine again for the group permissions changes to take effect:

envdir: fatal: unable to switch to directory /etc/mmw.d/env: access denied

Ports

The Vagrant configuration maps the following host ports to services running in the virtual machines.

Service Port URL
Django Web Application 8000 http://localhost:8000
Graphite Dashboard 8080 http://localhost:8080
Kibana Dashboard 5601 http://localhost:5601
PostgreSQL 5432 psql -h localhost
pgweb 5433 http://localhost:5433
Redis 6379 redis-cli -h localhost 6379
Testem 7357 http://localhost:7357
Tiler 4000 http://localhost:4000
Spark Job Server 8090 http://localhost:8090

Caching

In order to speed up things up, you may want to consider leveraging the vagrant-cachier plugin. If installed, it is automatically used by Vagrant.

To speed up geoprocessing, those requests are cached in Redis. To disable this caching for development purposes, set the value of MMW_GEOPROCESSING_CACHE to 0:

$ vagrant ssh worker -c 'echo "0" | sudo tee /etc/mmw.d/env/MMW_GEOPROCESSING_CACHE'
$ vagrant ssh worker -c 'sudo service celeryd restart'

To enable the geoprocessing cache simply set it to 1 and restart the celeryd service.

Test Mode

In order to run the app in test mode, which simulates the production static asset bundle, reprovision with VAGRANT_ENV=TEST vagrant provision.

Testing

Run all the tests:

$ ./scripts/test.sh
Python

To check for Python lint:

$ ./scripts/check.sh

To run all the tests on the Django app:

$ ./scripts/manage.sh test

Or just for a specific app:

$ ./scripts/manage.sh test apps.app_name.tests

More info here.

JavaScript

To check for JavaScript lint:

$ ./scripts/npm.sh run lint

When creating new tests or debugging old tests, it may be easier to open the testem page, which polls for changes to the test bundle and updates the test state dynamically.

First, start the testem process.

$ ./scripts/testem.sh

Then view the test runner page at http://localhost:7357.

To enable livereload, download the browser extension and start the livereload server with the following command:

./scripts/npm.sh run livereload

Bundling static assets

The bundle.sh script runs browserify, node-sass, and othe pre-processing tasks to generate static assets.

The vendor bundle is not created until you run this command with the --vendor flag. This bundle will be very large if combined with --debug.

Test bundles are not created unless the --tests flag is used.

In general, you should be able to combine --vendor, --tests, --debug, and --watch and have it behave as you would expect.

You can also minify bundles by using the --minify flag. This operation is not fast, and also disables source maps.

The --list flag displays module dependencies and does not actually generate any bundles. It doesn't make sense to combine this with --watch. This flag is for troubleshooting purposes only.

> bundle.sh -h
bundle.sh [OPTION]...

Bundle JS and CSS static assets.

 Options:
  --watch      Listen for file changes
  --debug      Generate source maps
  --minify     Minify bundles (**SLOW**); Disables source maps
  --tests      Generate test bundles
  --list       List browserify dependencies
  --vendor     Generate vendor bundle and copy assets
  -h, --help   Display this help text

Adding JS dependencies

To add a new JS dependency, update the JS_DEPS array in bundle.sh, and package.json accordingly. Because our dependencies are shrinkwrapped, follow the instructions for adding a dependency to a shrinkwrapped package. Rebuild the vendor bundle using ./scripts/bundle.sh --vendor. npm commands can be run using ./scripts/npm.sh.