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

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

Constant Summary collapse

MAX_PARAMETER_ATTEMPTS =

maximum number of attempts to get valid parameter value

5
TEMPLATE_PARAMETER_LOCATIONS =

Template parameter locations

['Parameters', 'parameters']
TEMPLATE_PARAMETER_DEFAULTS =

Template parameter default value locations

['Default', 'defaultValue', 'default']
TEMPLATE_PARAMETER_NOECHO =

Template parameter no echo locations

['NoEcho']

Instance Method Summary collapse

Instance Method Details

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

Detect nested stacks and apply



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# File 'lib/sfn/command_module/stack.rb', line 48

def apply_nested_stacks!(remote_stack, stack)
  remote_stack.resources.all.each do |resource|
    if(valid_stack_types.include?(resource.type))
      nested_stack = resource.expand
      apply_nested_stacks!(nested_stack, stack)
      mappings = generate_custom_apply_mappings(nested_stack)
      execute_apply_stack(nested_stack, stack, mappings)
    end
  end
  stack
end

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

Apply any defined remote stacks



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# File 'lib/sfn/command_module/stack.rb', line 24

def apply_stacks!(stack)
  remote_stacks = [config[:apply_stack]].flatten.compact
  remote_stacks.each do |stack_name|
    stack_info = stack_name.split('__')
    stack_info.unshift(nil) if stack_info.size == 1
    stack_location, stack_name = stack_info
    remote_stack = provider_for(stack_location).stack(stack_name)
    if(remote_stack)
      apply_nested_stacks!(remote_stack, stack)
      mappings = generate_custom_apply_mappings(remote_stack)
      execute_apply_stack(remote_stack, stack, mappings)
    else
      ui.error "Failed to apply requested stack. Unable to locate. (#{stack_name})"
      raise "Failed to locate stack: #{stack}"
    end
  end
  stack
end

#config_root_parameters ⇒ Hash 



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# File 'lib/sfn/command_module/stack.rb', line 280

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

#execute_apply_stack(provider_stack, receiver_stack, mappings) ⇒ TrueClass

Apply provider stack outputs to receiver stack parameters



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# File 'lib/sfn/command_module/stack.rb', line 99

def execute_apply_stack(provider_stack, receiver_stack, mappings)
  receiver_stack.apply_stack(provider_stack, :mapping => mappings)
  true
end

#format_config_parameters! ⇒ Object

Format config defined parameters to ensure expected layout



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# File 'lib/sfn/command_module/stack.rb', line 126

def format_config_parameters!
  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
end

#function_set_parameter?(val) ⇒ TrueClass, FalseClass

Determine if parameter was set via intrinsic function



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# File 'lib/sfn/command_module/stack.rb', line 275

def function_set_parameter?(val)
  val.is_a?(Hash)
end

#generate_custom_apply_mappings(provider_stack) ⇒ Hash

Build apply mappings valid for given provider stack



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# File 'lib/sfn/command_module/stack.rb', line 64

def generate_custom_apply_mappings(provider_stack)
  if(config[:apply_mapping])
    valid_keys = config[:apply_mapping].keys.find_all do |a_key|
      a_key = a_key.to_s
      key_parts = a_key.split('__')
      case key_parts.size
      when 3
        provider_stack.api.data[:location] == key_parts[0] &&
          provider_stack.name == key_parts[1]
      when 2
        provider_stack.name == key_parts[1]
      when 1
        true
      else
        raise ArgumentError "Invalid name format for apply stack mapping (`#{a_key}`)"
      end
    end
    to_remove = valid_keys.find_all do |key|
      valid_keys.any?{|v_key| v_key.match(/__#{Regexp.escape(key)}$/)}
    end
    valid_keys -= to_remove
    Hash[
      valid_keys.map do |a_key|
        cut_key = a_key.split('__').last
        [cut_key, config[:apply_mapping][a_key]]
      end
    ]
  end
end

#locate_config_parameter_key(parameter_prefix, parameter_name) ⇒ Array<String>

Determine correct configuration parameter key



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# File 'lib/sfn/command_module/stack.rb', line 146

def locate_config_parameter_key(parameter_prefix, parameter_name)
  check_name = parameter_name.downcase.tr('-_', '')
  check_prefix = parameter_prefix.map{|i| i.downcase.tr('-_', '') }
  key_match = config[:parameters].keys.detect do |cp_key|
    cp_key = cp_key.to_s.downcase.split('__').map{|i| i.tr('-_', '') }.join('__')
    cp_key.start_with?(check_prefix.join('__')) &&
      cp_key.split('__').last == check_name
  end
  actual_key = (parameter_prefix + [parameter_name]).compact.join('__')
  if(key_match)
    config[:parameters][actual_key] = config[:parameters].delete(key_match)
  end
  actual_key
end

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

Prompt for parameter values and store result

Options Hash (opts):

  • :current_parameters (Hash) —

    current stack parameter values

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

    existing stack



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

def populate_parameters!(sparkle, opts={})
  current_parameters = opts.fetch(:current_parameters, {})
  current_stack = opts[:stack]
  parameter_prefix, stack_parameters = prefix_parameters_setup(sparkle)
  unless(stack_parameters.empty?)
    format_config_parameters!
    param_banner = false
    stack_parameters.each do |param_name, param_value|
      ns_key = locate_config_parameter_key(parameter_prefix, param_name)
      # When parameter is a hash type, it is being set via
      # intrinsic function and we don't modify
      if(function_set_parameter?(current_parameters[param_name]))
        if(current_stack)
          enable_set = validate_stack_parameter(current_stack, param_name, ns_key, current_parameters[param_name])
        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_key] = current_parameters[param_name].is_a?(Hash) ?
            Smash.new(current_parameters[param_name]) :
            current_parameters[param_name].dup
          valid = true
        end
      else
        if(current_stack && current_stack.data[:parent_stack])
          use_expected = validate_stack_parameter(current_stack, param_name, ns_key, current_parameters[param_name])
          unless(use_expected)
            current_parameters[param_name] = current_stack.parameters[param_name]
          end
        end
      end
      unless(valid)
        param_banner = set_parameter(sparkle, ns_key, param_name, param_value, current_parameters, param_banner)
      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

#prefix_parameters_setup(sparkle) ⇒ Array<Array<String>, Smash>

Generate name prefix for config parameter based on location and extract template parameters



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# File 'lib/sfn/command_module/stack.rb', line 109

def prefix_parameters_setup(sparkle)
  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 = TEMPLATE_PARAMETER_LOCATIONS.map do |loc_key|
      sparkle[loc_key]
    end.compact.first || Smash.new
  end
  [parameter_prefix, stack_parameters]
end

#set_parameter(sparkle, ns_key, param_name, param_value, current_parameters, param_banner) ⇒ TrueClass, FalseClass

Populate stack parameter value via user interaction



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# File 'lib/sfn/command_module/stack.rb', line 170

def set_parameter(sparkle, ns_key, param_name, param_value, current_parameters, param_banner)
  valid = false
  attempt = 0
  if(!valid && !param_banner)
    if(sparkle.is_a?(SparkleFormation))
      ui.info "#{ui.color('Stack runtime parameters:', :bold)} - template: #{ui.color(sparkle.root_path.map(&:name).map(&:to_s).join(' > '), :green, :bold)}"
    else
      ui.info ui.color('Stack runtime parameters:', :bold)
    end
    param_banner = true
  end
  until(valid)
    attempt += 1
    default = config[:parameters].fetch(
      ns_key, current_parameters.fetch(
        param_name, TEMPLATE_PARAMETER_DEFAULTS.map{|loc_key| param_value[loc_key]}.compact.first
      )
    )
    if(config[:interactive_parameters])
      answer = ui.ask_question(
        "#{param_name.split(/([A-Z]+[^A-Z]*)/).find_all{|s|!s.empty?}.join(' ')}",
        :default => default,
        :no_echo => !!TEMPLATE_PARAMETER_NOECHO.detect{|loc_key|
          param_value[loc_key].to_s.downcase == 'true'
        }
      )
    else
      answer = default
    end
    validation = validate_parameter(answer, param_value)
    if(validation == true)
      config[:parameters][ns_key] = 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
  param_banner
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.



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# File 'lib/sfn/command_module/stack.rb', line 299

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]
  unless(config[:parameter_validation] == 'none')
    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.to_s != stack_value.to_s)
      if(config[:parameter_validation] == 'default')
        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'])
      else
        answer = config[:parameter_validation]
      end
      answer == 'expected'
    else
      true
    end
  else
    true
  end
end