Class: StackMaster::StackDiffer

Inherits:
Object
  • Object
show all
Defined in:
lib/stack_master/stack_differ.rb

Instance Method Summary collapse

Constructor Details

#initialize(proposed_stack, current_stack) ⇒ StackDiffer

Returns a new instance of StackDiffer.



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# File 'lib/stack_master/stack_differ.rb', line 6

def initialize(proposed_stack, current_stack)
  @proposed_stack = proposed_stack
  @current_stack = current_stack
end

Instance Method Details

#body_diff ⇒ Object 



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# File 'lib/stack_master/stack_differ.rb', line 45

def body_diff
  @body_diff ||= Diffy::Diff.new(current_template, proposed_template, context: 7, include_diff_info: true).to_s
end

#body_different? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/stack_master/stack_differ.rb', line 41

def body_different?
  body_diff != ''
end

#current_parameters ⇒ Object 



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# File 'lib/stack_master/stack_differ.rb', line 22

def current_parameters
  if @current_stack
    YAML.dump(sort_params(@current_stack.parameters_with_defaults))
  else
    ''
  end
end

#current_template ⇒ Object 



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# File 'lib/stack_master/stack_differ.rb', line 16

def current_template
  return '' unless @current_stack
  return @current_stack.template_body unless @current_stack.template_format == :json
  JSON.pretty_generate(TemplateUtils.template_hash(@current_stack.template_body))
end

#noecho_keys ⇒ Object 



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# File 'lib/stack_master/stack_differ.rb', line 66

def noecho_keys
  if @current_stack
    @current_stack.parameters_with_defaults.select do |key, value|
      value == "****"
    end.keys
  else
    []
  end
end

#output_diff ⇒ Object 



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# File 'lib/stack_master/stack_differ.rb', line 57

def output_diff
  display_diff('Stack', body_diff)
  display_diff('Parameters', params_diff)
  unless noecho_keys.empty?
    StackMaster.stdout.puts " * can not tell if NoEcho parameters are different."
  end
  StackMaster.stdout.puts "No stack found" if @current_stack.nil?
end

#params_diff ⇒ Object 



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# File 'lib/stack_master/stack_differ.rb', line 53

def params_diff
  @param_diff ||= Diffy::Diff.new(current_parameters, proposed_parameters, {}).to_s
end

#params_different? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/stack_master/stack_differ.rb', line 49

def params_different?
  params_diff != ''
end

#proposed_parameters ⇒ Object 



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# File 'lib/stack_master/stack_differ.rb', line 30

def proposed_parameters
  # **** out any secret parameters in the current stack.
  params = @proposed_stack.parameters_with_defaults
  if @current_stack
    noecho_keys.each do |key|
      params[key] = "****"
    end
  end
  YAML.dump(sort_params(params))
end

#proposed_template ⇒ Object 



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# File 'lib/stack_master/stack_differ.rb', line 11

def proposed_template
  return @proposed_stack.template_body unless @proposed_stack.template_format == :json
  JSON.pretty_generate(JSON.parse(@proposed_stack.template_body))
end

#single_param_update?(param_name) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/stack_master/stack_differ.rb', line 76

def single_param_update?(param_name)
  return false if param_name.blank? || @current_stack.blank? || body_different?
  differences = Hashdiff.diff(@current_stack.parameters_with_defaults, @proposed_stack.parameters_with_defaults)
  return false if differences.count != 1
  diff = differences[0]
  diff[0] == "~" && diff[1] == param_name
end