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"]
TEMPLATE_PARAMETER_SFN_NOECHO =

Template parameter no echo custom

["Quiet", "quiet"]

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 49

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

Parameters:

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

Returns:

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


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# File 'lib/sfn/command_module/stack.rb', line 25

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

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 300

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

Parameters:

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

    stack providing outputs

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

    stack receiving outputs for parameters

Returns:

  • (TrueClass) 


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# File 'lib/sfn/command_module/stack.rb', line 101

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 132

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

Parameters:

  • val (Object)

Returns:

  • (TrueClass, FalseClass) 


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# File 'lib/sfn/command_module/stack.rb', line 295

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

Parameters:

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

    stack providing outputs

Returns:

  • (Hash) —

    output to parameter mapping



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# File 'lib/sfn/command_module/stack.rb', line 65

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[0]
      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, root_name) ⇒ Array<String>

Determine correct configuration parameter key

Parameters:

  • parameter_prefix (Array<String>) —

    nesting prefix names

  • parameter_name (String) —

    parameter name

Returns:

  • (Array<String>) —
    expected_template_key, configuration_used_key 


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# File 'lib/sfn/command_module/stack.rb', line 151

def locate_config_parameter_key(parameter_prefix, parameter_name, root_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("__")
    non_root_matcher = (check_prefix + [check_name]).join("__")
    root_matcher = ([root_name] + check_prefix + [check_name]).join("__")
    cp_key == non_root_matcher ||
      cp_key == root_matcher
  end
  actual_key = (parameter_prefix + [parameter_name]).compact.join("__")
  if key_match
    ui.debug "Remapping configuration runtime parameter `#{key_match}` -> `#{actual_key}`"
    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

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 238

def populate_parameters!(sparkle, opts = {})
  current_parameters = opts[:current_parameters] || {}
  current_stack = opts[:stack]
  parameter_prefix, stack_parameters = prefix_parameters_setup(sparkle)
  sparkle_root_name = sparkle.is_a?(SparkleFormation) ? sparkle.root.name : nil
  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, sparkle_root_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 !config[:parameters][ns_key].nil?
          ui.warn "Overriding mapped parameter value with explicit assignment `#{ns_key}`!"
        else
          if current_stack
            enable_set = validate_stack_parameter(current_stack, param_name, ns_key, current_parameters[param_name])
          else
            enable_set = true
          end
        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

Parameters:

  • sparkle (SparkleFormation, Hash) —

    template instance

Returns:

  • (Array<Array<String>, Smash>) —

    prefix value, parameters



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# File 'lib/sfn/command_module/stack.rb', line 111

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

Parameters:

  • sparkle (SparkleFormation, Hash) —

    template

  • ns_key (String) —

    configuration parameter key name

  • param_name (String) —

    template parameter name

  • param_value (Hash) —

    template parameter value

  • current_parameters (Hash) —

    currently set stack parameters

  • param_banner (TrueClass, FalseClass) —

    parameter banner has been printed

Returns:

  • (TrueClass, FalseClass) —

    parameter banner has been printed



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# File 'lib/sfn/command_module/stack.rb', line 178

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]
      no_echo = !!TEMPLATE_PARAMETER_NOECHO.detect { |loc_key|
        param_value[loc_key].to_s.downcase == "true"
      }
      sfn_no_echo = TEMPLATE_PARAMETER_SFN_NOECHO.map do |loc_key|
        res = param_value.delete(loc_key).to_s.downcase
        res if !res.empty? && res != "false"
      end.compact.first
      no_echo = sfn_no_echo if sfn_no_echo
      answer = ui.ask_question(
        "#{param_name.split(/([A-Z]+[^A-Z]*)/).find_all { |s| !s.empty? }.join(" ")}",
        :default => default,
        :hide_default => sfn_no_echo == "all",
        :no_echo => !!no_echo,
      )
    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 "#{param_name}: #{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.

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 319

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})"
        if config[:interactive_parameters]
          answer = ui.ask_question("Use current value or expected value for #{p_key} " \
          "[current/expected]?", :valid => ["current", "expected"])
        else
          raise Error::InteractionDisabled
        end
      else
        answer = config[:parameter_validation]
      end
      answer == "expected"
    else
      true
    end
  else
    true
  end
end