Module: Lono::Cfn::Suffix

Included in:
Base
Defined in:
lib/lono/cfn/suffix.rb

Constant Summary collapse

@@append_suffix =

Appends a short suffix at the end of a stack name. Lono internally strips this same suffix for the template name. Makes it convenient for the development flow.

lono cfn current --suffix 1
lono cfn create demo => demo-1
lono cfn update demo-1

Instead of typing:

lono cfn create demo-1 --template demo
lono cfn update demo-1 --template demo

The suffix can be specified at the CLI but can also be saved as a preference.

A random suffix can be specified with random. Example:

lono cfn current --suffix random
lono cfn create demo => demo-[RANDOM], example: demo-abc
lono cfn update demo-abc

It is not a default setting because it might confuse new lono users.

nil

Instance Method Summary collapse

Instance Method Details

#allow_suffix? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/lono/cfn/suffix.rb', line 49

def allow_suffix?
  %w[Lono::Cfn::Create Lono::Cfn::Deploy].include?(self.class.to_s)
end

#append_suffix(stack_name) ⇒ Object 



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# File 'lib/lono/cfn/suffix.rb', line 27

def append_suffix(stack_name)
  return @@append_suffix if @@append_suffix
  return stack_name unless allow_suffix?

  suffix ||= stack_name_suffix == 'random' ? random_suffix : stack_name_suffix
  @@append_suffix = [stack_name, suffix].compact.join('-')
end

#random_suffix ⇒ Object

only generate random suffix for Create class



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# File 'lib/lono/cfn/suffix.rb', line 54

def random_suffix
  return nil unless allow_suffix?
  (0...3).map { (65 + rand(26)).chr }.join.downcase # Ex: jhx
end

#remove_suffix(stack_name) ⇒ Object 



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# File 'lib/lono/cfn/suffix.rb', line 35

def remove_suffix(stack_name)
  return stack_name unless allow_suffix?
  return stack_name unless stack_name_suffix

  if stack_name_suffix == 'random'
    stack_name.sub(/-(\w{3})$/,'') # strip the random suffix at the end
  elsif stack_name_suffix
    pattern = Regexp.new("-#{stack_name_suffix}$",'')
    stack_name.sub(pattern, '') # strip suffix
  else
    stack_name
  end
end

#stack_name_suffix ⇒ Object 



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# File 'lib/lono/cfn/suffix.rb', line 59

def stack_name_suffix
  if @options[:suffix] && !@options[:suffix].nil?
    return @options[:suffix] # CLI option takes highest precedence
  end

  Lono.suffix # core.rb accounts for LONO_SUFFIX env variable, current, and settings
end