dag.rb

require './block.rb'
class DAG

  attr_accessor :tips
  attr_reader :lock, :miner

  def initialize(miner, genesis_block)
    @tips = [genesis_block]
    @lock = Mutex.new
    @miner = miner
  end

  def add_block(block)
    lock.synchronize do
      @tips = @tips + [block] - block.parents
      puts "Miner ##{miner.id} added block #{block.id} to his DAG with parents #{block.parents.map(&:id)}"
    end
    block
  end

  def create_block
    block = Block.new(parents: random_parents_for_new_block)
    puts "Miner ##{miner.id} created block #{block.id}"
    add_block(block)
  end

  def random_parents_for_new_block
    # choosing a random integer 0 < random_number_of_parents < tips.length
    random_number_of_parents = rand(tips.length) + 1
    tips.sample(random_number_of_parents)
  end
end