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chicago-tool-library / circulate

A lending library management system
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lending-library rails ruby ruby-on-rails tool-library

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Circulate

CI status

[!NOTE] Welcome, contributors! Please see our guide for how to contribute to the project. 💖

About

Circulate is an operating system for lending libraries. It currently provides the following functionality:

There is content and information hard-coded in many of the views that is specific to The Chicago Tool Library, for which the software is being initially developed. Over time, the plan is for these specifics to make their way into configuration or user-editable content so that the software is easily used by other lending libraries.

Project Considerations

Requirements

Circulate is a fairly standard Rails application. The main application requires a recent version of Ruby, a PostgreSQL database, and a modern version of Node and Yarn to build assets.

Integrations

The following third party services are used:

Development

Once you've completed the setup below, you can login to the app using admin@example.com and password to see the admin interface.

Setting up Circulate on your machine

If you're new to Ruby or Rails applications, a recommended way to get set up is to use the GoRails setup guide. On that page you can select your operating system and the versions of Ruby and Rails you want to setup. It's worth going through the entire tutorial if you haven't worked on a Ruby on Rails application on your computer already as it is easier to sort through possible issues before getting into a large project like Circulate. It will take about 30 minutes to complete this tutorial.

Time to get the Circulate repo! In your terminal, first make sure you're where you want to put the repo by typing pwd. If you want the Circulate repo to be in a different spot, type cd and change to the directory you want to put the Circulate repo in.

Next, put the full text below and press enter:

git clone https://github.com/rubyforgood/circulate.git

That will clone the Circulate repo to your machine, so you have a nice copy to work with locally! (Looking ahead, as you work you'll be pushing UP any changes you make from there to the Circulate repo on GitHub as a pull request.)

In your terminal, type cd circulate to change the directory you are in to your freshly-cloned, locally-hosted directory, Circulate.

Okay, at this point you've got a Ruby on Rails development environment set up and cloned the Circulate repo! Now you'll need to run the following commands one at a time in your terminal:

$ bin/setup

This command will run install Ruby and JavaScript dependencies, create a local database, fill that database with a development dataset. If you see errors when it runs, you can look at what steps the script runs and work through them one at a time to figure out what is going wrong.

All right, almost there! In the terminal, type and run:

$ bin/rails test

Look for the word "Finished". That output should look similar to this:

Finished in 4.167485s, 41.0319 runs/s, 134.8535 assertions/s.

For working on this app, it is great to have two terminal windows open. Run bin/dev in one terminal, which will start up the application, bundle CSS and compile JS all at the same time. Use a second terminal open for git and other commands you might need to type while working.

Open an internet browser, type localhost:3000, and hit enter. You should see the Circulate app in your browser!

After you have the application running, here are some places to explore:

  1. Sign in to the admin interface using admin@example.com as the username and password as the password.
  2. Complete the new member signup flow.

Multi-tenancy

The default tenant for this application is the Chicago Tool Library, but the application permits multiple tenants, identified by the URL used to access the application. In the local development environment, the following tenants are available:

chicago.circulate.local
denver.circulate.local

Users are not currently shared between libraries; check db/seeds.rb for the full set of users as whom you can login to each of these libraries.

In order to access libraries other than the first one on your local machine, you need to edit your hosts file. This file is located at /etc/hosts on macOS and Linux, and C:\Windows\System32\drivers\etc on Windows or under WSL (Windows Subsystem for Linux). Add the following lines to the file:

127.0.0.1 chicago.circulate.local
127.0.0.1 denver.circulate.local

You can now access these libraries at http://chicago.circulate.local:3000 and http://denver.circulate.local:3000.

You will need to add additional lines to your hosts file if you need to work with additional libraries locally.

Configuring your database

By default the application will attempt to connect to a local PostgreSQL database accessible via a local domain socket. IF you need to specify other credentials on your machine, add any required values to the file .env.local:

# Database credentials
PGUSER=your-postgres-username
PGPASSWORD=your-postgres-password
PGHOST=localhost

If .env.local doesn't exist in your project directory yet, you will need to create it.

Resetting the application

During development, you can reset the database to the initial state by running bin/setup. This will delete any changes you have made to the database!

This can be useful if you need to run through a certain scenario multiple times manually, or when switching branches to get back into a known good state.

Running tests

Use the standard Rails test commands:

$ rails test # to run model, controller, and integration tests
$ rails test:system # to run system tests

Note, in order to get system tests to run, you will need chromedriver installed. See Requirements section above.

Remote tests and test tagging

Tests tagged as remote are not run by default. They are defined by passing additional arguments to test when defining the test methods:

test "do something with a remote server", :remote do
  # interact with a remote machine
end

This kind of test are useful to ensure that some code in the repository actually works with an external server properly, but since that test has a dependency on that server (and often on having access to credentials), we don't want to automatically run those tests all the time.

If you'd like to run all the tests (regardless of whether they are remote or not), you can do that:

$ bin/rails test -t :remote

This works for running the tests in a file as well:

$ bin/rails test path/to/file -t :remote

The : prefix clears the default setting that negates tests with the remote flag. You can also run only tests tagged with remote (or any other tag):

$ bin/rails test path/to/file -t remote

It's also possible to filter out tests with other tags (should we add them) using the ~ prefix. The following would cause the test runner to ignore any tests tagged with slow:

$ bin/rails test -t ~slow

Code formatting and linting

We are using Standard and ERB Lint to keep the project's code consistently formatted. The format of code is checked on PRs as a part of our GitHub Actions workflow.

To check the format of the project's code, use the following commands:

$ bundle exec standardrb --fix                   # Check all .rb files
$ bundle exec erblint --lint-all --autocorrect   # Check all .erb files

If you run into issues with these tools, please let us know and we'll be happy to help you out.

Setup pre-commit checks

You may choose to leverage Lefthook to run a few linters before creating commits, including Standard. Follow these instructions to configure your local git repository to run pre-commit checks.

Note that ERB files aren't checked as a part of precommit as it is just too slow.

Documentation

Circulate leans heavily on a handful of open source frameworks and libraries, the documentation for which will be useful to developers:

Who to log in as

During development, you will probably want to log into the app as various users (e.g. an admin or a member). seeds.rb creates a set of user accounts when bin/setup are run. They are:

These users are associated with the first seed library, Chicago Tool Library. A similar set of users can be used to log in to the second seed library, Denver Tool Library, by appending .denver to the username portion of the email address (for example, admin.denver@example.com).

All of the seed user passwords are the word "password".

Alternative Development Setups

We generally advise you to avoid these alternative development setups unless you are already very comfortable with them. The above development instructions should be better for most users.

Deployment

Circulate is currently running on Heroku in production, but it should run fairly well anywhere Rails applications can be run.

The following addons are expected to be enabled:

$ heroku addons
Add-on                                           Plan       Price     State
───────────────────────────────────────────────  ─────────  ────────  ───────
bucketeer (bucketeer-defined-xxxxx)              hobbyist   $5/month  created
 └─ as BUCKETEER

heroku-postgresql (postgresql-horizontal-xxxxx)  hobby-dev  free      created
 └─ as DATABASE

sendgrid (sendgrid-tetrahedral-xxxxx)            starter    free      created
 └─ as SENDGRID

logdna (logdna-symmetrical-xxxxx)                zepto      $5/month  created
 └─ as LOGDNA

scheduler (scheduler-round-xxxxx)                standard   free      created
 └─ as SCHEDULER

Using a different way of configuring the file storage or email services should require trivial code changes.

Configuring git remotes for Heroku

If you'll be working with the Heroku apps, it's good to setup git remotes for both staging and production:

$ heroku git:remote --remote production -a chicagotoollibrary
$ heroku git:remote --remote staging -a chicagotoollibrary-staging

Promoting a build

To deploy the current staging build to production, use heroku pipelines:promote -r staging.

Buildpacks

The following buildpacks are currently used in production:

1. heroku-community/apt
2. https://github.com/mojodna/heroku-buildpack-jemalloc.git
3. heroku/metrics
4. https://github.com/heroku/heroku-buildpack-activestorage-preview
5. heroku/ruby

Release Command

The Procfile is configured to run database migrations during the release stage of deployment.

Daily Summary Emails

rails send_daily_loan_summaries is set to run every evening using Heroku Scheduler. Set this to a time after any open hours to ensure that all of the day's activity has taken place.

Here is the full list of scheduled tasks:

rails sync:calendars Every 10 minutes
rails email:send_return_reminders Daily at 1:00 PM UTC  
rails email:send_daily_loan_summaries Daily at 3:00 AM UTC  
rails email:send_staff_daily_renewal_requests Daily at 12:00 AM UTC     
rails holds:start_waiting_holds Every 10 minutes    
rails email:send_overdue_notices Daily at 3:00 AM UTC   
rails email:send_membership_renewal_reminders Daily at 12:00 AM UTC

Google Calendar

The application uses the Google Calendar API for several calendar-based features, most importantly, appointment scheduling. There are two ways to handle setting up the calendars and credentials needed for the system to work.

Local development

To setup calendars for local development:

  1. Log into Google Calendar
  2. Create two calendars, one for Appointment slots and one for volunteer shifts.
  3. In .env.local, set the IDs of these calendars (which can be found on the Settings & Sharing screen) as the values of APPOINTMENT_SLOT_CALENDAR_ID and VOLUNTEER_SLOT_CALENDAR_ID.

To get credentials to work with these on your local machine:

  1. Go to APIs & Credendials and click "Create Credentials".
  2. Select "OAuth client ID".
  3. Choose "Web application" as the Application type.
  4. Use whatever name you'd like, maybe something like "Circulate Development".
  5. Under "Authorized redirect URIs", click "ADD URI" and enter https://developers.google.com/oauthplayground.
  6. Click "Create".
  7. Go to the Google OAuth Playground.
  8. Click on the gear icon to open the "OAuth 2.0 configuration" menu.
  9. Select the "Use your own OAuth credentials" checkbox.
  10. Enter the values for "OAuth Client ID" and "OAuth Client secret" from step 6.
  11. Close the menu.
  12. In the left pane, scroll down to "Google Calendar API v3". Under that heading, select "https://www.googleapis.com/auth/calendar" as the scope.
  13. Click "Authorize APIs". You'll go through the OAuth flow, be sure to select a Google account that has access to the calendars (like the one that created them).
  14. Then click "Exchange authorization code for tokens".
  15. Copy the value for "Refresh token" and keep it somewhere safe.
  16. In .env.local, set the value of GOOGLE_REFRESH_TOKEN to the value from step 15 and the value of GOOGLE_CLIENT_ID and GOOGLE_CLIENT_SECRET to the values from step 6.

If everything is setup properly, you should be able to run bin/rails sync:calendars without it displaying an error. The output of that command is written to the Rails log, so you can check log/development.log to see if it worked.

Production

In production, the application authenticates using a service account. This requires two environment variables be set:

At dyno start time, Heroku executes the .profile script, which writes the credential JSON into a file that is then read by the googleauth library.

The two calendars are both shared with the service account's email using the Google Calendar UI. Their IDs are stored in APPOINTMENT_SLOT_CALENDAR_ID and VOLUNTEER_SLOT_CALENDAR_ID in the Heroku config.

Alternatives

It's a bit early for non-developers to adopt Circulate. There are some existing systems worth considering for anyone looking to get something setup right now:

Folks interested in helping to build Circulate should get in touch, though! We'd love to have more contributors to the project.