Class: AWSCarb::Config

Inherits:
Object
  • Object
show all
Includes:
Singleton
Defined in:
lib/aws-carb/config.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#config ⇒ Object

Returns the value of attribute config.



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# File 'lib/aws-carb/config.rb', line 7

def config
  @config
end

Instance Method Details

#[](key) ⇒ Object 



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# File 'lib/aws-carb/config.rb', line 92

def [](key)
  @config[key]
end

#check_route53_settings ⇒ Object 



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# File 'lib/aws-carb/config.rb', line 20

def check_route53_settings
  die 'route53: no zone id specified!' if @config[:route53][:zone].nil?
  die 'route53: no ttl specified!'     if @config[:route53][:zone].nil?
end

#create(cli_arguments) ⇒ Object 



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# File 'lib/aws-carb/config.rb', line 9

def create(cli_arguments)

  @config = load_file(cli_arguments.global.config_file)

  merge_cli_arguments_with_config(cli_arguments)

  establish_hostname_and_domain

  check_route53_settings
end

#display ⇒ Object 



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# File 'lib/aws-carb/config.rb', line 172

def display
  puts "# config:"
  ap @config
  puts
end

#establish_hostname_and_domain ⇒ Object

try and work out the hostname, presidence is:

  • config file

  • user_data_template_variables cli args

note: raw user_data is not checked (not to be confused with user_data_template or user_data_template_variables..)



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# File 'lib/aws-carb/config.rb', line 103

def establish_hostname_and_domain
  ShellSpinner "# checking whether hostname and domain have been set", false do

    hostname, domain = nil

    @config[:route53][:hostname] = find_with_context(:hostname, :user_data_template_variables) if find_with_context(:hostname, :user_data_template_variables)
    @config[:route53][:domain]   = find_with_context(:domain,   :user_data_template_variables) if find_with_context(:domain,   :user_data_template_variables)
    @config[:route53][:hostname] = find_with_context(:hostname, :route53)                      if find_with_context(:hostname, :route53)
    @config[:route53][:domain]   = find_with_context(:domain,   :route53)                      if find_with_context(:domain,   :route53)

    help = <<-HEREDOC.strip_heredoc
      #       
      #         checked:
      #          'common', 'user_data_template_variables',
      #          and 'route53' sections of config
      #          --common-variables, --route53-variables,
      #          and --user-data-template-variables
      #
      #          route53 dynamic DNS will not be updated!
    HEREDOC

    domain   = @config[:route53][:domain]
    hostname = @config[:route53][:hostname]

    if domain.nil? and hostname.nil?
      debug <<-HEREDOC.strip_heredoc
        # WARNING: hostname and domain not found"
        #{help}

      HEREDOC

    elsif domain and hostname.nil?
      debug <<-HEREDOC.strip_heredoc
        # WARNING: hostname not found
        #{help}

      HEREDOC

    elsif domain.nil? and hostname
      debug <<-HEREDOC.strip_heredoc
        # WARNING: domain not found
        #{help}

      HEREDOC

    else
      debug <<-HEREDOC.strip_heredoc
        # found hostname and domain:
        hostname: #{hostname}
        domain:   #{domain}

      HEREDOC

      @config[:route53][:new_dns_records] = {
        :public  => {
          :alias => "#{hostname}.#{domain}.",
          :target => nil
        },
        :private => {
          :alias => "#{hostname}-private.#{domain}.",
          :target => nil
        }
      }
    end
  end

  puts
end

#find_with_context(key, context) ⇒ Object

when looking for a key, check ‘common’ section first, then override if a value in the supplied context is found..



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# File 'lib/aws-carb/config.rb', line 86

def find_with_context(key, context) 
  return @config[context][key] if @config[context][key]
  return @config[:common][key] if @config[:common][key]
  return nil
end

#load_file(cli_argument_config_file) ⇒ Object 



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# File 'lib/aws-carb/config.rb', line 69

def load_file(cli_argument_config_file)

  # allow forcing of no config file..
  return if cli_argument_config_file.empty?

  config_file = cli_argument_config_file

  begin
    @config = ActiveSupport::HashWithIndifferentAccess.new(YAML.load_file(config_file))
  rescue => e
    puts "# failed to load config file: '#{config_file}'"
    die e
  end
end

#merge_cli_arguments_with_config(cli_arguments) ⇒ Object 



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# File 'lib/aws-carb/config.rb', line 25

def merge_cli_arguments_with_config(cli_arguments)
  begin

    config_sections = [:common, :general, :ec2, :route53, :user_data_template_variables, :user_data_template]

    # special condition: common command line arguments are shared between all instances first..
    if cli_arguments.subcommand.config_overrides.common_variables
      @config[:common] ||= {}
      @config[:common].update cli_arguments.subcommand.config_overrides.common_variables
    end

    # all sections share 'common' variables..
    config_sections.each do |section|
      @config[section] ||= {}
      @config[section].update @config[:common]
    end

    # merge the config overrides hashes into config
    if cli_arguments.subcommand.config_overrides
      cli_arguments.subcommand.config_overrides.marshal_dump.each do |key, value|

        next if key == :common

        # key differs from command line argument - we lose the _variables suffix
        config_key = key.to_s.gsub('_variables', '').to_sym

        @config[config_key] ||= {}
        @config[config_key].update cli_arguments.subcommand.config_overrides.send(key)
      end
    end

    # merge the convenience arguments..
    config_sections.each do |section|
      if cli_arguments.subcommand.send(section.to_s)
        @config[section].update cli_arguments.subcommand.send(section.to_s).marshal_dump
      end
    end

  rescue => e
    puts "# failed to merge cli arguments with config"
    die e
  end
end