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Hyrax Management Guide
The Hyrax Management Guide provides tips for how to manage, customize, and enhance your Hyrax application.
- Feature matrix
- Production concerns
- Translations
- Workflows
- Audiovisual transcoding
- Removing a work type
- User interface
- Integration with Dropbox, Box, etc.
- Administrative Set relationship
- Autocomplete with geonames
- Analytics and usage statistics
- Zotero integration
- Customizing metadata
- Admin users
Feature matrix (moved to its own page)
In production or production-like (e.g., staging) environments, you may want to make changes to the following areas.
Hyrax uses the ActiveFedora::Noid gem to mint Noid-style identifiers -- short, opaque identifiers -- for all user-created content (including GenericWorks
, FileSets
, and Collections
). The identifier minter is stateful, meaning that it keeps track of where it is in the sequence of minting identifiers so that the minter can be "replayed," for example in a disaster recovery scenario. (Read more about the technical details.) The state also means that the minter, once it has minted an identifier, will never mint it again so there's no risk of identifier collisions.
Identifier state is tracked by default in a file that is located in a well-known directory in UNIX-like environments, /tmp/
, but this may be insufficient in production-like environments where /tmp/
may be aggressively cleaned out. To prevent the chance of identifier collisions, it is recommended that you go one of two routes: specifying a less transient shared filesystem location or using a relational database to store minter state.
You can continue using the filesystem for minter state if you have a system location that your application can write to that is under its control (read: not /tmp/
). If you are deploying via Capistrano, that location should not be in your application directory, which will change on each deployment. If you run multiple instances of your Hyrax application, for instance in load-balanced scenarios, you will want to choose a filesystem location that all instances can access. You may change this by uncommenting and changing the value in this line from config/initializers/hyrax.rb
to a filesystem location other than /tmp/
:
# config.minter_statefile = '/tmp/minter-state'
Alternatively, to get around situations where you have multiple application instances attempting to obtain locks on a single, shared filesystem location, you may use the database-backed minter (new to ActiveFedora::Noid 2.x), which stores minter state information in your application's relational database.
To use it, you'll first need to run the install generator:
$ rails generate active_fedora:noid:install
This will create the necessary database tables and seed the database minter. To start minting identifiers with the new minter, override the AF::Noid configuration in e.g config/initializers/active_fedora-noid.rb
:
require 'active_fedora/noid'
ActiveFedora::Noid.configure do |config|
config.minter_class = ActiveFedora::Noid::Minter::Db
end
Using the database-backed minter can cause problems with your test suite, where it is often sensible to wipe out database rows between tests (which destroys the database-backed minter's state, which renders it unusable). To deal with this and still get the benefits of using the database-backed minter in development and production environments, you'll also want to add the following helper to your spec/spec_helper.rb
:
require 'active_fedora/noid/rspec'
RSpec.configure do |config|
include ActiveFedora::Noid::RSpec
config.before(:suite) { disable_production_minter! }
config.after(:suite) { enable_production_minter! }
end
If you switch to the new database-backed minter and want to include in that minter the state of your current file-backed minter, AF::Noid 2.x provides a new rake task that will copy your minter's state from the filesystem to the database:
$ rails active_fedora:noid:migrate:file_to_database
In Hyrax, derivatives are served from a directory on the filesystem rather than directly from the Fedora repository. If your production environment includes multiple Rails servers, you will want to make sure that they are using a shared filesystem for derivatives. To set this directory, change the value of config.derivatives_path
in config/initializers/hyrax.rb
. The default value is tmp/derivatives/
within your application directory, which will cause unexpected behavior in a multi-server configuration, or if you deploy with capistrano.
The web server provided by Rails (whether that's WEBrick, Unicorn, or another) is not built to scale out very far, so you should consider alternatives such as Passenger with Apache httpd or nginx.
If you encounter problems with the Default Admin Set and run Passenger or Apache, you may need to set the follow options in your configuration:
# Apache
AllowEncodedSlashes NoDecode
# Passenger
PassengerAllowEncodedSlashes on
The database provided by default is SQLite, and you may wish to swap in something built more for scale like PostgreSQL or MySQL, both of which have been used in other production Hyrax applications.
As mentioned in the README, Hyrax (as of version 2.0.0) uses a WebSocket-based user notification system, which uses Rails' ActionCable framework. There are known issues (upstream bug) with the WebSocket implementation in Passenger's Apache integration, so notifications will not work with that configuration. Note that Hyrax is smart enough to detect when it's been deployed via Passenger + Apache, and it will automatically disable realtime notifications for you so that it does not start up in a disabled state.
If user notifications are important to your application, consider serving the application via other methods, whether that be Puma, Passenger + Nginx, or Passenger Standalone via Apache reverse proxy. In the meantime, you may wish to disable realtime notifications at deploy time -- to do so, set config.realtime_notifications = false
in config/initializers/hyrax.rb
.
ActionCable can work with the Redis and PostgreSQL adapters (though notifications will not work with the async
adapter, which is the default). See more about how to configure these adapters in the ActionCable documentation. To enable user notifications, make sure that you have configured ActionCable to use one of the above adapters in your application's config/cable.yml
. E.g., to use the Redis adapter in the production
Rails environment:
production:
adapter: redis
url: redis://yourhost.yourdomain.edu:6379
Hyrax uses ActionMailer to send email to users. Some environments may need special configuration to enable your application to send messages. These changes are best made in one of your application's environment files. The configuration options are documented in the ActionMailer Rails Guide.
Background Workers (moved to its own page)
Hyrax provides a service that iterates over all file sets in your repository and verifies fixities in the background. Hyrax will not run this service for you, so you should use a cronjob (or similar, e.g., the whenever
gem) to run this on a schedule that fits your needs and your content. The code that'll need to run is:
Hyrax::RepositoryFixityCheckService.fixity_check_everything
To turn on virus detection, install clamav
on your system and add the clamav
gem to your application's Gemfile
:
gem 'clamav'
By default, as of version 2.1.0, Hyrax generates a working ruby IIIF ('RIIIF') configuration into your application but will not turn on the image server or use the UniversalViewer-enabled work show page. To enable both, you have two options. You can either use the built-in RIIIF server or you can use your own IIIF image server.
Note that in order to use the UniversalViewer in Hyrax, you will need to enable the public file server (which is very likely turned off in RAILS_ENV=production
). This is a requirement of the pul_uv_rails
dependency that we rely upon for the UniversalViewer: see https://github.com/pulibrary/pul_uv_rails/issues/8.
To use the embedded image server, RIIIF, set config.iiif_image_server
to true
in config/initializers/hyrax.rb
and restart your application. This assumes you have the RIIIF files Hyrax generates into your application. If you skipped this step earlier or missed it, run rails g hyrax:riiif
. (Not sure if this has been done? Check to see that config/initializers/riiif.rb
exists. If not, run the generator. If so, you should be good to go.)
In production environments using Apache and/or Passenger, you may need to add configuration so that RIIIF can resolve URLs. See the RIIIF README for guidance on this.
If you have explicitly URI-decoded the RIIIF url in config/initializers/riiif.rb
per the RIIIF README, you may encounter authorization errors. In that case, you will also need to decode the object.id
string in the Hyrax::IIIFAuthorizationService
by overriding the #file_set_id_for
method, like so:
def file_set_id_for(object)
if object.id.include? '/'
object.id.split('/').first
else
URI.decode(object.id).split('/').first
end
end
To use your own image server and avoid using RIIIF altogether, you should install Hyrax by passing the --skip-riiif
flag to opt out of RIIIF. This applies to new Hyrax applications. If upgrading an existing Hyrax application, a manual, optional step is required to generate RIIIF into existing applications -- so, do not run this step if you prefer to use a custom image server instead of RIIIF. (If you change your mind later, you can always run rails g hyrax:riiif
to pull in RIIIF as an image server.)
To make Hyrax use your custom image server, you should tweak the following configuration variables in config/initializers/hyrax.rb
:
-
config.iiif_image_server
must be set totrue
-
config.iiif_image_url_builder
must be set to a lambda/proc that takes three arguments and returns a valid link to an image request from your image server:-
file_id
, which looks likerv042t299%2Ffiles%2F6d71677a-4f80-42f1-ae58-ed1063fd79c7
(a path to aHydra::PCDM::File
within aHydra::Works::FileSet
) -
base_url
, which looks likehttp://your.site.edu/
-
size
, which is a valid IIIF Image API size parameter
-
-
config.iiif_info_url_builder
must be set to a lambda/proc that takes two arguments and returns a valid link to an IIIF image information request from your image server:-
file_id
, which looks likerv042t299%2Ffiles%2F6d71677a-4f80-42f1-ae58-ed1063fd79c7
(a path to aHydra::PCDM::File
within aHydra::Works::FileSet
) -
base_url
, which looks likehttp://your.site.edu/
-
-
config.iiif_image_compliance_level_uri
must be set to a URI corresponding to a IIIF Image API compliance level -
config.iiif_image_size_default
must be set to a valid IIIF Image API size parameter
To switch off the image server, whether you're using RIIIF or a custom server, make the following change to config/initializers/hyrax.rb
in your application:
config.iiif_image_server = false
You should also comment out all remaining config.iiif_*
lines to return the application to its default status.
Hyrax provides IIIF manifests for all works by default, even when config.iiif_image_server
is set to false
. Note that these may not be very useful until backed by an image server.
Hyrax, by default, uses Universal Viewer to display images where an image server has been configured.
The following guidance on Universal Viewer refers to Hyrax version 3 and above.
In order to display the Universal Viewer, Hyrax requires the Unviersal Viewer javascript library.
The package.json
file located in the application root directory is configured to install universalviewer version 3 into public/uv. The following commands will install universalviewer:
yarn install
rake assets:precompile
- Edit
package.json
to remove or amend the universal viewer installation and deployment steps. - Either override the
#universal_viewer_url_base
method inapp/helpers/hyrax/iiif_helper.rb
to point to a different viewer html location, or keep using the provided uv.html but amend the paths to universal viewer.
It is easy to configure Universal Viewer, for example to default the table of contents to be closed or to remove the download options. Hyrax provides a default (empty) configuration file at public/uv/uv_config.json
. Customise this file to change the Universal Viewer behavior.
To use a different file altogether, override the #universal_viewer_config_url
method in app/helpers/hyrax/iiif_helper.rb
.
Cleaning up Temporary Directories and Files Due to the asynchronous nature of the ingest pipeline, Hyrax doesn't always clean up its own temp directories and files. It is, therefore, a good idea to do some out-of-band cleanup via a periodic task (such as a cron job). For example, the following shell command will clear out any files in /tmp over 1 megabyte in size that haven't been changed in the past 4 days:
$ find /tmp -ctime +3 -and -size +1M -delete
In a production environment, specifics such as the location of the temp directory, how often to clear it, and the age/size of the files to remove are system-dependent, so a proper cleanup strategy should be implemented in consultation with sysadmins and/or devops.
As your repository grows in size, or if you have a work with very large amounts of child works or filesets, certain operations may encounter an error such as SystemStackError (stack level too deep)
. This means the default limit set on Ruby's stack size has been exceeded. Sometimes this type of error indicates a circular loop of logic, but in our case it can occur when recursive code operates on works with many members.
A fix is to raise the limit.
RUBY_THREAD_MACHINE_STACK_SIZE=8388608
RUBY_THREAD_VM_STACK_SIZE=8388608
Setting this environment variable will raise the limit considerably from its default of 1048576 as of Ruby 2.7. This variable must be set before the ruby process is started, and therefore outside of the application. Depending on your application's environment, this might be defined in a Dockerfile, or with an Apache + passenger setup in the systemd service definition: Environment=RUBY_THREAD_MACHINE_STACK_SIZE=8388608
Hyrax ships with a user interface that has been translated into a number of languages (seven as of Nov. 2017). If your application uses Devise for authentication and you are seeing English strings even when Hyrax is showing strings in another language, you may use the devise-i18n
gem to translate these strings. See the devise-i18n documentation for more information on how to do this.
Read more about Defining a Workflow
Hyrax includes support for transcoding audio and video files via Hyrax. View Hyrax README for installation/configuration help.
If you need to remove a work type that you created, e.g., via rails generate hyrax:work MyWorkType
, you can do so via:
rails destroy hyrax:work MyWorkType
And then manually remove the line that registers MyWorkType
from config/initializers/hyrax.rb
.
If you encounter problems with the in-browser content editor -- e.g., the About page, and the three blocks on the homepage -- you should remove turbolinks support from app/assets/javascripts/application.js
if present by deleting the following line:
//= require turbolinks
Hyrax provides built-in support for the browse-everything gem, which provides a consolidated file picker experience for selecting files from DropBox, Skydrive, Google Drive, Box, and a server-side directory share.
To activate browse-everything in your hyrax app, run the browse-everything install generator
rails g browse_everything:install --skip-assets
This will generate a file at config/browse_everything_providers.yml. Open that file and enter the API keys for the providers that you want to support in your app. For more info on configuring browse-everything, go to the project page on github.
After running the browse-everything install generator and setting the API keys for the desired providers, an extra tab will appear in your app's Upload page allowing users to pick files from those providers and submit them into your app's repository.
By default, Administrative Sets and their member objects use the Dublin Core Terms predicate isPartOf
to express the membership relationship. Hyrax also allows use of a custom predicate for this relationship. To customize the predicate, point the Hyrax configuration option admin_set_predicate
at another RDF term or a URI object.
(Note: allowing customization is the first step towards changing the default predicate for this relation. After the 2.0.0 release, Hyrax will warn users about using isPartOf
for this purpose and add migration tooling for production instances using isPartOf
. The default will change in Hyrax 3.0.0.)
In order for autocomplete to work in the location field, you must have a valid geonames account that can query the service and return possible matches. To setup an account, visit: http://www.geonames.org/login.
After registering and getting an account username, you'll need to enable the free web services by going to http://www.geonames.org/manageaccount and clicking the link to enable. Once that's done, and you've verified you can query the service via their REST Api, add the account username to the config/initializers/hyrax.rb
file under config.geonames_username
.
Hyrax provides support for capturing usage information via Google Analytics and for displaying usage stats in the UI.
Hyrax supports your choice of either Google Analytics or Matomo. To enable analytics tracking and reporting features, follow the directions below.
Analytics can be enabled and configured using environment variables. Set HYRAX_ANALYTICS to true, set either 'google' or 'matomo' for HYRAX_ANALYTICS_PROVIDER, and set the date you would like reporting to start (ANALYTICS_START_DATE).
HYRAX_ANALYTICS=true
HYRAX_ANALYTICS_PROVIDER=google
ANALYTICS_START_DATE=2021-08-21
If using google, you'll also need the following ENV variables:
GOOGLE_ANALYTICS_ID=UA-111111-1 # Universal ID (Currently Hyrax Analytics only works with Univeral (UA) accounts)
GOOGLE_OAUTH_APP_NAME=
GOOGLE_OAUTHAPP_VERSION=
GOOGLE_OAUTH_PRIVATE_KEY_PATH= # store the .p12 file in the root of your application
GOOGLE_OAUTH_PRIVATE_KEY_SECRET=
GOOGLE_OAUTH_CLIENT_EMAIL=
Add these ENV variables if using Matomo:
MATOMO_SITE_ID=
MATOMO_BASE_URL=
MATOMO_AUTH_TOKEN=
Once analytics is enabled, Hyrax will automatically install the JS tracking code. Page views and downloads of a file set are recorded and sent to the selected analytics provider. Admin users will have access to an expanded dashboard with details about how many vistors viewed a page, and how many visitors downloaded a file. Easily find the top works by views, and most popular file downloads!
To enable the Google Analytics javascript snippet, make sure that config.google_analytics_id
is set in your app within the config/initializers/hyrax.rb
file. A Google Analytics ID typically looks like UA-99999999-1.
To display data from Google Analytics in the UI, first head to the Google Developers Console and create a new project:
https://console.developers.google.com/project
Let's assume for now Google assigns it a project ID of foo-bar-123. It may take a few seconds for this to complete (watch the Activities bar near the bottom of the browser). Once it's complete, enable the Google+ and Google Analytics APIs here (note: this is an example URL -- you'll have to change the project ID to match yours):
https://console.developers.google.com/apis/library?project=foo-bar-123
Finally, click the 'credentials' menu item and create a new Service Account Key. This will give you the client ID, a client email address, a private key file, and a private key secret/password, which you will need in the next step.
Edit config/analytics.yml to reflect the information that the Google Developer Console gave you earlier; namely you'll need to provide it:
- The path to the private key
- The password/secret for the privatekey
- The Service Account ID (email)
- An application name (you can make this up)
- An application version (you can make this up)
Lastly, you will need to set config.analytics = true
and config.analytic_start_date
in config/initializers/hyrax.rb and ensure that the client email
has the proper access within your Google Analyics account. To do so, go to the Admin tab for your Google Analytics account.
Click on User Management, in the Account column, and add "Read & Analyze" permissions for the OAuth client email address.
TODO: Add more detail
The API access required in the UI integration step, above, enables more than just per-object stats display. We can harvest GA stats for all of our objects into the local database, and use this data to integrate usage reports into the Admin Statistics dashboard. So far this integration into the dashboard has not been done.
To harvest stats for all your objects, you might use a rake task that runs Sufia::UserStatImporter which in turn is called by a cron job.
Having a problem setting up Analytics. See Analytics-workaround-for-non-production-environments, which documents a workaround for one known issue.
Integration with Zotero-managed publications is possible using Arkivo. Arkivo is a Node-based Zotero subscription service that monitors Zotero for changes and will feed those changes to your Hyrax-based app. Read more about this work.
To enable Zotero integration, first register an OAuth client with Zotero, then install and start Arkivo-Hyrax and then generate the Arkivo API in your Hyrax-based application:
rails g hyrax:arkivo_api
The generator does the following:
- Enables the API in the Hyrax initializer
- Adds a database migration
- Creates a routing constraint that allows you to control what clients can access the API
- Copies a config file that allows you to specify the host and port Arkivo is running on
- Copies a config file for your Zotero OAuth client credentials
Update your database schema with rails db:migrate
.
Add unique Arkivo tokens for each of your existing user accounts with rails hyrax:user:tokens
. (New users will have tokens created as part of the account creation process.)
Edit the routing constraint in config/initializers/arkivo_constraint.rb
so that your Hyrax-based app will allow connections from Arkivo. Make sure this is restrictive as you are allowing access to an API that allows creates, updates and deletes.
Tweak config/arkivo.yml
to point at the host and port your instance of Arkivo is running on.
Tweak config/zotero.yml
to hold your Zotero OAuth client key and secret. Alternatively, if you'd rather not paste these into a file, you may use the environment variables ZOTERO_CLIENT_KEY
and ZOTERO_CLIENT_SECRET
.
Restart your app and it should now be able to pull in Zotero-managed publications on behalf of your users. Each user will need to link their Hyrax app account with their Zotero accounts, which can be done in the "Edit Profile" page. After the accounts are linked, Arkivo will create a subscription to that user's Zotero-hosted "My Publications" collection. When users add items to their "My Publications" collection via the Zotero client, they will automatically be pushed into the Hyrax-based repository application. Updates to these items will trigger updates to item metadata in your app, and deletes will delete the files from your app.
Chances are you will want to customize the default metadata provided by Hyrax. Here's a guide to help you with that in Hyrax.