Class: Karafka::Cli::Topics::Plan

Inherits:
Base
  • Object
show all
Defined in:
lib/karafka/cli/topics/plan.rb

Overview

Plans the migration process and prints what changes are going to be applied if migration would to be executed

Instance Method Summary collapse

Methods included from Helpers::Colorize

#green, #grey, #red, #yellow

Instance Method Details

#call ⇒ Boolean

Figures out scope of changes that need to happen

Returns:

  • (Boolean) —

    true if running migrate would change anything, false otherwise



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# File 'lib/karafka/cli/topics/plan.rb', line 11

def call
  # If no changes at all, just print and stop
  if topics_to_create.empty? && topics_to_repartition.empty? && topics_to_alter.empty?
    puts "Karafka will #{yellow('not')} perform any actions. No changes needed."

    return false
  end

  unless topics_to_create.empty?
    puts 'Following topics will be created:'
    puts

    topics_to_create.each do |topic|
      puts "  #{green('+')} #{topic.name}:"
      puts "    #{green('+')} partitions: \"#{topic.declaratives.partitions}\""

      topic.declaratives.details.each do |name, value|
        puts "    #{green('+')} #{name}: \"#{value}\""
      end

      puts
    end
  end

  unless topics_to_repartition.empty?
    puts 'Following topics will be repartitioned:'
    puts

    topics_to_repartition.each do |topic, partitions|
      from = partitions
      to = topic.declaratives.partitions

      puts "  #{yellow('~')} #{topic.name}:"
      puts "    #{yellow('~')} partitions: \"#{red(from)}\" #{grey('=>')} \"#{green(to)}\""
      puts
    end
  end

  unless topics_to_alter.empty?
    puts 'Following topics will have configuration changes:'
    puts

    topics_to_alter.each do |topic, configs|
      puts "  #{yellow('~')} #{topic.name}:"

      configs.each do |name, changes|
        from = changes.fetch(:from)
        to = changes.fetch(:to)
        action = changes.fetch(:action)
        type = action == :change ? yellow('~') : green('+')
        puts "    #{type} #{name}: \"#{red(from)}\" #{grey('=>')} \"#{green(to)}\""
      end

      puts
    end
  end

  true
end