Class: Lono::Cfn::Preview::Changeset

Inherits:
Base show all
Defined in:
lib/lono/cfn/preview/changeset.rb

Instance Method Summary collapse

Methods inherited from Base

#capabilities, #command_with_iam, #continue_update_rollback, #continue_update_rollback_sure?, #delete_rollback_stack, #exit_unless_updatable!, #generate_all, #notification_arns, #pretty_path, #prompt_for_iam, #quit, #rerun_with_iam?, #set_template_url!, #show_options, #stack_status, #starting_message, #status, #tags

Methods included from Utils::Sure

#sure?

Methods included from AwsServices

#cfn, #ec2, #iam, #s3, #s3_presigner, #s3_resource, #sts

Methods included from AwsServices::Helper

#rollback_complete?, #testing_update?

Methods included from AwsServices::StackSet

#find_stack_set, #stack_set_exists?

Methods included from AwsServices::Stack

#find_stack, #stack_exists?

Methods inherited from AbstractBase

#initialize, #reinitialize, #template_path

Methods included from Blueprint::Root

#find_blueprint_root, #set_blueprint_root

Constructor Details

This class inherits a constructor from Lono::AbstractBase

Instance Method Details

#change_set_name ⇒ Object

generates a change set name



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# File 'lib/lono/cfn/preview/changeset.rb', line 118

def change_set_name
  @change_set_name ||= "changeset-#{Time.now.strftime("%Y%d%m%H%M%S")}"
end

#create_change_set(parameters) ⇒ Object 



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# File 'lib/lono/cfn/preview/changeset.rb', line 22

def create_change_set(parameters)
  unless stack_exists?(@stack)
    puts "WARN: Cannot create a change set for the stack because the #{@stack} does not exists.".color(:yellow)
    return false
  end
  exit_unless_updatable!

  options = {
    change_set_name: change_set_name,
    stack_name: @stack,
    parameters: parameters,
  }
  options[:notification_arns] = notification_arns if notification_arns
  options[:tags] = tags unless tags.empty?
  set_template_url!(options)
  show_options(options, "cfn.create_change_set")
  begin
    # Tricky for preview need to set capabilities so that it gets updated. For Base#run save within the begin block already.
    options[:capabilities] = capabilities # ["CAPABILITY_IAM", "CAPABILITY_NAMED_IAM"]
    cfn.create_change_set(options)
  rescue Aws::CloudFormation::Errors::InsufficientCapabilitiesException => e
    # If coming from cfn_preview_command automatically add iam capabilities
    cfn_preview_command = ARGV.join(" ").include?("cfn preview")
    if cfn_preview_command
      # e.message is "Requires capabilities : [CAPABILITY_IAM]"
      # grab CAPABILITY_IAM with regexp
      capabilities = e.message.match(/\[(.*)\]/)[1]
      @options.merge!(capabilities: [capabilities])
      retry
    end
    yes = rerun_with_iam?(e)
    retry if yes
  rescue Aws::CloudFormation::Errors::ValidationError => e
    handle_error(e)
  end
  true
end

#delete_change_set ⇒ Object 



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# File 'lib/lono/cfn/preview/changeset.rb', line 103

def delete_change_set
  cfn.delete_change_set(
    change_set_name: change_set_name,
    stack_name: @stack
  )
end

#display_change_set ⇒ Object 



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# File 'lib/lono/cfn/preview/changeset.rb', line 75

def display_change_set
  print "Generating CloudFormation Change Set for preview.."
  change_set = describe_change_set
  until change_set_finished?(change_set) do
    change_set = describe_change_set
    sleep 1
    print '.'
  end
  puts

  case change_set.status
  when "CREATE_COMPLETE"
    puts "CloudFormation preview for '#{@stack}' stack update. Changes:"
    changes = change_set.changes.sort_by do |change|
      change["resource_change"]["action"]
    end
    changes.each do |change|
      display_change(change)
    end
  when "FAILED"
    puts "WARN: Fail to create a CloudFormation preview for '#{@stack}' stack update. Reason:".color(:yellow)
    puts change_set.status_reason
    quit(0)
  else
    raise "hell: never come here"
  end
end

#execute_change_set ⇒ Object 



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# File 'lib/lono/cfn/preview/changeset.rb', line 110

def execute_change_set
  cfn.execute_change_set(
    change_set_name: change_set_name,
    stack_name: @stack
  )
end

#handle_error(e) ⇒ Object

Example errors: “Template error: variable names in Fn::Sub syntax must contain only alphanumeric characters, underscores, periods, and colons”



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# File 'lib/lono/cfn/preview/changeset.rb', line 62

def handle_error(e)
  raise if ENV['FULL_BACKTRACE']

  if e.message =~ /^Parameters: / || e.message =~ /^Template error: /
    puts "Error creating CloudFormation preview because invalid CloudFormation parameters. Full error message:".color(:red)
    puts e.message
    puts "For full backtrace run command again with FULL_BACKTRACE=1"
    quit(1)
  else
    raise
  end
end

#preview_change_set(parameters) ⇒ Object 



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# File 'lib/lono/cfn/preview/changeset.rb', line 17

def preview_change_set(parameters)
  success = create_change_set(parameters)
  display_change_set if success
end

#run ⇒ Object

Override run from Base superclass, the run method is different enough with Preview



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# File 'lib/lono/cfn/preview/changeset.rb', line 4

def run
  puts "Changeset Preview:".color(:green)

  if @options[:noop]
    puts "NOOP CloudFormation preview for #{@stack} update"
    return
  end

  parameters = generate_all
  success = preview_change_set(parameters)
  delete_change_set if success && !@options[:keep] # Clean up and delete the change set
end