Module: Sneakers::Migrator

Defined in:
lib/sneakers/migrator.rb,
lib/sneakers/migrator/version.rb

Overview

Do not define a module named Queue here to avoid conflict with Sneakers::Queue (which is a class, not a module)

Defined Under Namespace

Classes: Error

Constant Summary collapse

VERSION = 
"0.1.3"

Class Method Summary collapse

Class Method Details

.migrate!(amqp_url:, amqp_api_url:, subscriber_paths: [], logger: nil) ⇒ Object

Main migration entrypoint



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# File 'lib/sneakers/migrator.rb', line 16

def migrate!(amqp_url:, amqp_api_url:, subscriber_paths: [], logger: nil)
  logger ||= $stdout
  # Try to require sneakers or kicks
  begin
    require "sneakers"
  rescue LoadError
    begin
      require "kicks"
    rescue LoadError
      raise Error, "You must have either the 'sneakers' or 'kicks' gem installed to use subscriber discovery."
    end
  end

  # Load all subscribers (recursively)
  subscriber_paths.each do |path|
    Dir[File.join(path, "**", "*.rb")].sort.each do |f|
      logger.puts "Migrator: Loading subscriber file: #{f}"
      begin
        require f
      rescue LoadError => e
        logger.puts "Migrator: Failed to load subscriber file #{f}: #{e.message}"
      rescue StandardError => e
        logger.puts "Migrator: Error loading subscriber file #{f}: #{e.class}: #{e.message}"
      end
    end
  end

  # Find all worker classes for the loaded framework
  subscribers = ObjectSpace.each_object(Class).select do |klass|
    klass.included_modules.include?(::Sneakers::Worker)
  rescue StandardError
    false
  end

  # output found subscribers
  logger.puts "Migrator: Found #{subscribers.size} subscribers:"
  subscribers.each { |s| logger.puts "  - #{s.name}" }

  queues = subscribers.map do |klass|
    opts = klass.instance_variable_get(:@queue_opts) || {}
    name = klass.instance_variable_get(:@queue_name) ||
           (klass.const_defined?(:QUEUE_NAME) ? klass.const_get(:QUEUE_NAME) : nil) ||
           klass.name.gsub("::", "_").gsub(/([a-z\d])([A-Z])/, '\1_\2').downcase
    {
      name: name,
      exchange: opts[:exchange] || "domain_events",
      routing_keys: opts[:routing_key] || [],
      arguments: opts[:arguments] || {},
      durable: opts.fetch(:durable, true)
    }.tap { |q| q[:arguments]["x-queue-type"] ||= "classic" }
  end.uniq { |q| q[:name] }

  conn = Bunny.new(amqp_url)
  conn.start
  ch = conn.create_channel

  # Remove unused api_uri and fix variable usage
  rabbitmq_api_user = URI.parse(amqp_api_url).user
  rabbitmq_api_pass = URI.parse(amqp_api_url).password
  all_queues = fetch_all_queues(amqp_api_url, rabbitmq_api_user, rabbitmq_api_pass)

  queues.each do |q|
    existing_queue_info = all_queues.find { |info| info["name"] == q[:name] }
    if existing_queue_info.nil?
      logger.puts "Migrator: Queue #{q[:name]} does not exist, creating..."
      ch.queue(q[:name], durable: q[:durable], arguments: q[:arguments])
      next
    end
    migrate_queue!(q, ch, amqp_api_url, rabbitmq_api_user, rabbitmq_api_pass, logger, existing_queue_info)
  end
end