Outboxer is an implementation of the transactional outbox pattern for Ruby on Rails applications.
It helps you migrate to event-driven architecture with at least once delivery guarantees.
1. Install gem
bundle add outboxer
bundle install2. Generate schema migrations, publisher script and tests
bin/rails g outboxer:install3. Migrate database
bin/rails db:migrate4. Generate event schema and model
bin/rails generate model Event type:string created_at:datetime --skip-timestamps
bin/rails db:migrate5. Queue outboxer message after event created
# app/models/event.rb
class Event < ApplicationRecord
after_create do |event|
Outboxer::Message.queue(messageable: event)
end
end6. Derive event type
# app/models/accountify/invoice_raised_event.rb
module Accountify
class InvoiceRaisedEvent < Event; end
end7. Create derived event type
Accountify::InvoiceRaisedEvent.create!8. Publish outboxer messages
# bin/outboxer_publisher
Outboxer::Publisher.publish_messages do |publisher, messages|
# TODO: publish messages here
Outboxer::Message.published_by_ids(
ids: messages.map { |message| message[:id] },
publisher_id: publisher[:id],
publisher_name: publisher[:name])
rescue => error
Outboxer::Message.failed_by_ids(
ids: messages.map { |message| message[:id] },
exception: error,
publisher_id: publisher[:id],
publisher_name: publisher[:name])
endsee https://github.com/fast-programmer/outboxer/wiki/Outboxer-publisher-block-examples
The generated spec/bin/outboxer_publisher adds end to end queue and publish message test coverage.
Monitor using the built-in web UI:
Rails
# config/routes.rb
require 'outboxer/web'
mount Outboxer::Web, at: '/outboxer'Rack
# config.ru
require 'outboxer/web'
map '/outboxer' { run Outboxer::Web }All contributions are welcome!
Open-sourced under LGPL v3.0.
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