Module: Sfn::CommandModule::Stack::InstanceMethods

Defined in:
lib/sfn/command_module/stack.rb

Constant Summary collapse

UNPACK_NAME_JOINER =

unpacked stack name joiner/identifier

'-sfn-'
MAX_PARAMETER_ATTEMPTS =

maximum number of attempts to get valid parameter value

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Instance Method Summary collapse

Instance Method Details

#apply_nested_stacks!(remote_stack, stack) ⇒ Miasma::Models::Orchestration::Stack

Detect nested stacks and apply

Parameters:

  • remote_stack (Miasma::Models::Orchestration::Stack) —

    stack to inspect for nested stacks

  • stack (Miasma::Models::Orchestration::Stack) —

    current stack

Returns:

  • (Miasma::Models::Orchestration::Stack) 


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# File 'lib/sfn/command_module/stack.rb', line 39

def apply_nested_stacks!(remote_stack, stack)
  remote_stack.resources.all.each do |resource|
    if(resource.type == 'AWS::CloudFormation::Stack')
      nested_stack = resource.expand
      apply_nested_stacks!(nested_stack, stack)
      stack.apply_stack(nested_stack)
    end
  end
  stack
end

#apply_stacks!(stack) ⇒ Miasma::Models::Orchestration::Stack

Apply any defined remote stacks

Parameters:

  • stack (Miasma::Models::Orchestration::Stack)

Returns:

  • (Miasma::Models::Orchestration::Stack) 


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# File 'lib/sfn/command_module/stack.rb', line 20

def apply_stacks!(stack)
  remote_stacks = [config[:apply_stack]].flatten.compact
  remote_stacks.each do |stack_name|
    remote_stack = provider.connection.stacks.get(stack_name)
    if(remote_stack)
      apply_nested_stacks!(remote_stack, stack)
      stack.apply_stack(remote_stack)
    else
      apply_unpacked_stack!(stack_name, stack)
    end
  end
  stack
end

#apply_unpacked_stack!(stack_name, stack) ⇒ Miasma::Models::Orchestration::Stack

Apply all stacks from an unpacked stack

Parameters:

  • stack_name (String) —

    name of parent stack

  • stack (Miasma::Models::Orchestration::Stack)

Returns:

  • (Miasma::Models::Orchestration::Stack) 


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# File 'lib/sfn/command_module/stack.rb', line 55

def apply_unpacked_stack!(stack_name, stack)
  result = provider.connection.stacks.all.find_all do |remote_stack|
    remote_stack.name.start_with?("#{stack_name}#{UNPACK_NAME_JOINER}")
  end.sort_by(&:name).map do |remote_stack|
    stack.apply_stack(remote_stack)
  end
  unless(result.empty?)
    stack
  else
    ui.error "Failed to apply requested stack. Unable to locate. (#{stack_name})"
    raise "Failed to locate stack: #{stack_name}"
  end
end

#config_root_parameters ⇒ Hash

Returns parameters for root stack create/update.

Returns:

  • (Hash) —

    parameters for root stack create/update



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# File 'lib/sfn/command_module/stack.rb', line 204

def config_root_parameters
  Hash[
    config.fetch(:parameters, {}).find_all do |k,v|
      !k.include?('__')
    end
  ]
end

#populate_parameters!(sparkle, opts = {}) ⇒ Hash

Prompt for parameter values and store result

Parameters:

  • sparkle (SparkleFormation, Hash)
  • opts (Hash) (defaults to: {})

Options Hash (opts):

  • :current_parameters (Hash) —

    current stack parameter values

  • :stack (Miasma::Models::Orchestration::Stack) —

    existing stack

Returns:

  • (Hash) 


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# File 'lib/sfn/command_module/stack.rb', line 112

def populate_parameters!(sparkle, opts={})
  current_parameters = opts.fetch(:current_parameters, {})
  current_stack = opts[:stack]
  if(sparkle.is_a?(SparkleFormation))
    parameter_prefix = sparkle.root? ? [] : (sparkle.root_path - [sparkle.root]).map do |s|
      Bogo::Utility.camel(s.name)
    end
    stack_parameters = sparkle.compile.parameters
    stack_parameters = stack_parameters.nil? ? Smash.new : stack_parameters._dump
  else
    parameter_prefix = []
    stack_parameters = sparkle.fetch('Parameters', Smash.new)
  end
  unless(stack_parameters.empty?)
    if(config.get(:parameter).is_a?(Array))
      config[:parameter] = Smash[
        *config.get(:parameter).map(&:to_a).flatten
      ]
    end
    if(config.get(:parameters))
      config.set(:parameters,
        config.get(:parameters).merge(config.fetch(:parameter, Smash.new))
      )
    else
      config.set(:parameters, config.fetch(:parameter, Smash.new))
    end
    stack_parameters.each do |k,v|
      ns_k = (parameter_prefix + [k]).compact.join('__')
      next if config[:parameters][ns_k]
      valid = false
      # When parameter is a hash type, it is being set via
      # intrinsic function and we don't modify
      if(current_parameters[k].is_a?(Hash))
        if(current_stack)
          enable_set = validate_stack_parameter(current_stack, k, ns_k, current_parameters[k])
        else
          enable_set = true
        end
        if(enable_set)
          # NOTE: direct set dumps the stack (nfi). Smash will
          # auto dup it, and works, so yay i guess.
          config[:parameters][ns_k] = Smash.new(current_parameters[k])
          valid = true
        end
      else
        if(current_stack && current_stack.data[:parent_stack])
          use_expected = validate_stack_parameter(current_stack, k, ns_k, current_parameters[k])
          unless(use_expected)
            current_parameters[k] = current_stack.parameters[k]
          end
        end
      end
      attempt = 0
      until(valid)
        attempt += 1
        default = config[:parameters].fetch(
          ns_k, current_parameters.fetch(
            k, v['Default']
          )
        )
        if(config[:interactive_parameters])
          answer = ui.ask_question("#{k.split(/([A-Z]+[^A-Z]*)/).find_all{|s|!s.empty?}.join(' ')}", :default => default)
        else
          answer = default
        end
        validation = Sfn::Utils::StackParameterValidator.validate(answer, v)
        if(validation == true)
          config[:parameters][ns_k] = answer
          valid = true
        else
          validation.each do |validation_error|
            ui.error validation_error.last
          end
        end
        if(attempt > MAX_PARAMETER_ATTEMPTS)
          ui.fatal 'Failed to receive allowed parameter!'
          exit 1
        end
      end
    end
  end
  Smash[
    config.fetch(:parameters, {}).map do |k,v|
      strip_key = parameter_prefix ? k.sub(/#{parameter_prefix.join('__')}_{2}?/, '') : k
      unless(strip_key.include?('__'))
        [strip_key, v]
      end
    end.compact
  ]
end

#unpack_nesting(name, file, action) ⇒ TrueClass

Unpack nested stack and run action on each stack, applying the previous stacks automatically

Parameters:

  • name (String) —

    container stack name

  • file (Hash) —

    stack template

  • action (String) —

    create or update

Returns:

  • (TrueClass) 


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# File 'lib/sfn/command_module/stack.rb', line 76

def unpack_nesting(name, file, action)
  config[:apply_stacks] ||= []
  stack_count = 0
  file['Resources'].each do |stack_resource_name, stack_resource|

    nested_stack_name = "#{name}#{UNPACK_NAME_JOINER}#{Kernel.sprintf('%0.3d', stack_count)}-#{stack_resource_name}"
    nested_stack_template = stack_resource['Properties']['Stack']

    namespace.const_get(action.to_s.capitalize).new(
      Smash.new(
        :print_only => config[:print_only],
        :template => nested_stack_template,
        :parameters => config.fetch(:parameters, Smash.new).to_smash,
        :apply_stacks => config[:apply_stacks],
        :options => config[:options]
      ),
      [nested_stack_name]
    ).execute!
    unless(config[:print_only])
      config[:apply_stacks].push(nested_stack_name).uniq!
    end
    config[:template] = nil
    provider.connection.stacks.reload
    stack_count += 1
  end

  true
end

#validate_stack_parameter(c_stack, p_key, p_ns_key, c_value) ⇒ TrueClass, FalseClass

Validate stack parameter is properly set via stack resource from parent stack. If not properly set, prompt user for expected behavior. This accounts for states encountered when a nested stack’s parameters are adjusted directly but the resource sets value via intrinsic function.

Parameters:

  • c_stack (Miasma::Models::Orchestration::Stack) —

    current stack

  • p_key (String) —

    stack parameter key

  • p_ns_key (String) —

    namespaced stack parameter key

  • c_value (Hash) —

    currently set value (via intrinsic function)

Returns:

  • (TrueClass, FalseClass) —

    value is validated



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# File 'lib/sfn/command_module/stack.rb', line 223

def validate_stack_parameter(c_stack, p_key, p_ns_key, c_value)
  stack_value = c_stack.parameters[p_key]
  p_stack = c_stack.data[:parent_stack]
  if(c_value.is_a?(Hash))
    case c_value.keys.first
    when 'Ref'
      current_value = p_stack.parameters[c_value.values.first]
    when 'Fn::Att'
      resource_name, output_name = c_value.values.first.split('.', 2)
      ref_stack = p_stack.nested_stacks.detect{|i| i.data[:logical_id] == resource_name}
      if(ref_stack)
        output = ref_stack.outputs.detect do |o|
          o.key == output_name
        end
        if(output)
          current_value = output.value
        end
      end
    end
  else
    current_value = c_value
  end
  if(current_value && current_value != stack_value)
    ui.warn 'Nested stack has been altered directly! This update may cause unexpected modifications!'
    ui.warn "Stack name: #{c_stack.name}. Parameter: #{p_key}. Current value: #{stack_value}. Expected value: #{current_value} (via: #{c_value.inspect})"
    answer = ui.ask_question("Use current value or expected value for #{p_key} [current/expected]?", :valid => ['current', 'expected'])
    answer == 'expected'
  else
    ui.warn "Unable to check #{p_key} for direct value modification. (Cannot auto-check expected value #{c_value.inspect})"
    true
  end
end