Flow

flow.rb

# Every block should catch errors and add them to the instance of CheckoutFlow
#
# CheckoutFlow.new.execute do
#   # ...
# end.then do
#   # ...
# end

class Flow
  def initialize
    @error = nil
    @_values = {}
  end

  attr_reader :error, :_values

  def execute(fail_silently: false, &block)
    if block_given?
      unless @error
        yield
      end
      self
    end
  rescue => e
    unless fail_silently
      @error = e
    end
    Rails.logger.error("Error: #{e.inspect}")
    Appsignal.set_error(e)
    self
  end

  alias_method :then, :execute

  def add_value(hash)
    @_values = @_values.merge(hash)
  end

  def get_value(key)
    value = @_values[key.to_sym]
    unless value
      raise MissingValueError, "The flow doesn't have the value: #{key}"
    end
    value
  end

  class MissingValueError < StandardError; end
end