Jets Uploads Image Processing
When you use ActiveStorage .variant helper method to create images of different sizes like so
@photo.image.variant(resize_to_limit: [300, 300])
It uses an image_processing gem underneath-the-hood.
System Package Dependencies
The image_processing gem requires the imagemagick or libvips system package to be installed. Jets detects will installs both packages for the Docker image when it detects that you have the image_processing. You do not have to configure it.
In the future, if new libraries support is added to the image_processing gem, here’s how you would add additional libraries for them.
config/jets/deploy.rb
Jets.deploy.configure do
config.dockerfile.apt.packages.all_stages = ["new-image-processing-package"]
end
Related
- Rails 7 uses vips by default: Rails Application Configuration Source
- PR: Make vips the default variant processor for new apps #42744
- Related: Upgrade Guide: ActiveStorage in Rails 6 and ImageProcessing and Getting vips to work with Rails on Heroku
- If the system libraries were not installed you would get this MiniMagick::Error (You must have ImageMagick or GraphicsMagick installed)
ActiveStorage Background Processing
ActiveStorage processing work handling is handled by different ActiveStorage Active Jobs. The default Rails.application.config.active_job.queue_adapter is async which should only be used for dev/test.When you configure the config.active_job.queue_adapter to :jets_job
To enable the creationg of Jets Job resources to handle ActiveJob work:
config/jets/deploy.rb
Jets.deploy.configure do
config.job.enable = true
end
This creates:
- The SQS Queue to store the jobs
- The Lambda Function that listens to Queue events and processes the jobs
AWS Lambda scales automatically to process the queue.
Jets Job ActiveJob Adapter
Jets provides a jets_job ActiveJob adapter that queues jobs to SQS. To enable it:
config/environments/production.rb
Rails.application.configure do
config.active_job.queue_adapter = :jets_job
end
Related: Jets Jobs Enable.