Class: Lono::Param::Generator
- Inherits:
-
Object
- Object
- Lono::Param::Generator
- Includes:
- Blueprint::Root, Conventions
- Defined in:
- lib/lono/param/generator.rb
Instance Attribute Summary collapse
-
#base_path ⇒ Object
readonly
set when generate is called.
-
#env_path ⇒ Object
readonly
set when generate is called.
Instance Method Summary collapse
-
#context ⇒ Object
Context for ERB rendering.
- #convert_to_cfn_format(contents, casing = :camel) ⇒ Object
- #generate ⇒ Object
-
#initialize(blueprint, options = {}) ⇒ Generator
constructor
A new instance of Generator.
-
#lookup_param_file(root: Lono.root, env: Lono.env) ⇒ Object
Lookup precedence:.
- #lookup_paths ⇒ Object
- #output_path ⇒ Object
- #param_file(path) ⇒ Object
-
#param_file?(path) ⇒ Boolean
Allows user to specify the .txt extension or not to.
-
#params(casing = :underscore) ⇒ Object
useful for when calling CloudFormation via the aws-sdk gem.
- #parse_contents(contents) ⇒ Object
-
#process_erb ⇒ Object
Reads both the base source and env source and overlay the two Example 1: params/base/mystack.txt - base path params/production/mystack.txt - env path.
- #puts_param_message(type) ⇒ Object
- #render_erb(path) ⇒ Object
-
#source_exist? ⇒ Boolean
Checks both base and source path for existing of the param file.
- #write_output(json) ⇒ Object
Methods included from Conventions
Methods included from Blueprint::Root
#bundler_groups, #find_blueprint_root, #require_bundle_gems, #set_blueprint_root
Constructor Details
#initialize(blueprint, options = {}) ⇒ Generator
Returns a new instance of Generator.
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# File 'lib/lono/param/generator.rb', line 7 def initialize(blueprint, ={}) @blueprint, @options = blueprint, set_blueprint_root(@blueprint) @template, @param = template_param_convention() end |
Instance Attribute Details
#base_path ⇒ Object (readonly)
set when generate is called
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# File 'lib/lono/param/generator.rb', line 6 def base_path @base_path end |
#env_path ⇒ Object (readonly)
set when generate is called
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# File 'lib/lono/param/generator.rb', line 6 def env_path @env_path end |
Instance Method Details
#context ⇒ Object
Context for ERB rendering. This is where we control what references get passed to the ERB rendering.
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# File 'lib/lono/param/generator.rb', line 180 def context @context ||= Lono::Template::Context.new(@blueprint, @options) end |
#convert_to_cfn_format(contents, casing = :camel) ⇒ Object
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# File 'lib/lono/param/generator.rb', line 195 def convert_to_cfn_format(contents, casing=:camel) lines = parse_contents(contents) # First use a Hash structure so that overlay env files will override # the base param file. data = {} lines.each do |line| key,value = line.strip.split("=").map {|x| x.strip} data[key] = value end # Now build up the aws json format for parameters params = [] data.each do |key,value| param = if value == "use_previous_value" { "ParameterKey": key, "UsePreviousValue": true } elsif value { "ParameterKey": key, "ParameterValue": value } end if param param = param.to_snake_keys if casing == :underscore params << param end end params end |
#generate ⇒ Object
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# File 'lib/lono/param/generator.rb', line 98 def generate puts "Generating parameter files for blueprint #{@blueprint.color(:green)}:" @base_path, @env_path = lookup_paths return unless @base_path || @env_path # useful option for lono cfn, since some templates dont require params return if @options[:allow_not_exists] && !source_exist? if source_exist? contents = process_erb data = convert_to_cfn_format(contents) json = JSON.pretty_generate(data) write_output(json) unless @options[:mute] short_output_path = output_path.sub("#{Lono.root}/","") puts " #{short_output_path}" end else puts "#{@base_path} or #{@env_path} could not be found? Are you sure it exist?" exit 1 end json end |
#lookup_param_file(root: Lono.root, env: Lono.env) ⇒ Object
Lookup precedence:
configs/BLUEPRINT/params/development/TEMPLATE/PARAM.txt
configs/BLUEPRINT/params/development/PARAM.txt
configs/BLUEPRINT/params/development.txt
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# File 'lib/lono/param/generator.rb', line 28 def lookup_param_file(root: Lono.root, env: Lono.env) # The docs conver direct_absolute_form and direct_relative_form as the "Direct Form" unless env == "base" direct_absolute_form = @param # user provided the absolute full path direct_relative_form = "#{root}/#{@param}" # user provided the full path within the lono project direct_env_form = "#{root}/configs/#{@blueprint}/params/#{env}/#{@param}" # direct lookup is simple direct_simple_form = "#{root}/configs/#{@blueprint}/params/#{@param}" # direct lookup is simple end long_form = "#{root}/configs/#{@blueprint}/params/#{env}/#{@template}/#{@param}" medium_form = "#{root}/configs/#{@blueprint}/params/#{env}/#{@param}" short_form = "#{root}/configs/#{@blueprint}/params/#{env}" if ENV['LONO_PARAM_DEBUG'] puts "Lono.blueprint_root #{Lono.blueprint_root}" puts "direct_absolute_form #{direct_absolute_form}" puts "direct_relative_form #{direct_relative_form}" puts "direct_env_form #{direct_env_form}" puts "direct_simple_form #{direct_simple_form}" puts "long_form #{long_form}" puts "medium_form #{medium_form}" puts "short_form #{short_form}" end unless env == "base" return param_file(direct_absolute_form) if param_file?(direct_absolute_form) return param_file(direct_relative_form) if param_file?(direct_relative_form) return param_file(direct_env_form) if param_file?(direct_env_form) # consider this first its simple and direct but is scope to env so it's more specific return param_file(direct_simple_form) if param_file?(direct_simple_form) # consider this first its simple and direct but is scope to env so it's more specific end return param_file(long_form) if param_file?(long_form) # consider this first because its more explicit # All 3 are the same # Also, blueprint and template the same and explicitly specified param if @blueprint == @template return param_file(medium_form) if param_file?(medium_form) # higher precedence between longer but short form should be encouraged return param_file(short_form) if param_file?(short_form) return # cannot find a param file end # Only template and param are the same if @template == @param return param_file(medium_form) if param_file?(medium_form) # only consider medium form return # cannot find a param file end end |
#lookup_paths ⇒ Object
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# File 'lib/lono/param/generator.rb', line 86 def lookup_paths @base_path = lookup_param_file(env: "base") @env_path = lookup_param_file(env: Lono.env) if ENV['LONO_PARAM_DEBUG'] puts " @base_path #{@base_path.inspect}" puts " @env_path #{@env_path.inspect}" end [@base_path, @env_path] end |
#output_path ⇒ Object
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# File 'lib/lono/param/generator.rb', line 228 def output_path output = Lono.config.output_path.sub("#{Lono.root}/","") path = if @base_path && !@env_path # Handle case when base config exist but the env config does not @base_path.sub("configs", output).sub("base", Lono.env) else @env_path.sub("configs", output) end path.sub(/\.txt$/,'.json') end |
#param_file(path) ⇒ Object
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# File 'lib/lono/param/generator.rb', line 80 def param_file(path) return path if File.file?(path) return "#{path}.txt" if File.file?("#{path}.txt") return "#{path}.sh" if File.file?("#{path}.sh") end |
#param_file?(path) ⇒ Boolean
Allows user to specify the .txt extension or not to. Also allows user to use other extensions like .sh if they are explicit about it.
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# File 'lib/lono/param/generator.rb', line 76 def param_file?(path) File.file?(path) || File.file?("#{path}.txt") || File.file?("#{path}.sh") end |
#params(casing = :underscore) ⇒ Object
useful for when calling CloudFormation via the aws-sdk gem
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# File 'lib/lono/param/generator.rb', line 134 def params(casing = :underscore) @base_path, @env_path = lookup_paths # useful option for lono cfn return {} if @options[:allow_not_exists] && !source_exist? contents = process_erb convert_to_cfn_format(contents, casing) end |
#parse_contents(contents) ⇒ Object
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# File 'lib/lono/param/generator.rb', line 184 def parse_contents(contents) lines = contents.split("\n") # remove comment at the end of the line lines.map! { |l| l.sub(/#.*/,'').strip } # filter out commented lines lines = lines.reject { |l| l =~ /(^|\s)#/i } # filter out empty lines lines = lines.reject { |l| l.strip.empty? } lines end |
#process_erb ⇒ Object
Reads both the base source and env source and overlay the two Example 1:
params/base/mystack.txt - base path
params/production/mystack.txt - env path
the base/mystack.txt gets combined with the prod/mystack.txt
it produces a final prod/mystack.txt
Example 2:
params/base/mystack.txt - base path
the base/mystack.txt is used to produced a prod/mystack.txt
Example 3:
params/production/mystack.txt - env path
the prod/mystack.txt is used to produced a prod/mystack.txt
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# File 'lib/lono/param/generator.rb', line 161 def process_erb contents = [] contents << render_erb(@base_path) contents << render_erb(@env_path) result = contents.compact.join("\n") # puts "process_erb result".color(:yellow) # puts result result end |
#puts_param_message(type) ⇒ Object
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# File 'lib/lono/param/generator.rb', line 13 def (type) path = send("#{type}_path") return unless path if param_file?(path) pretty_path = path.sub("#{Lono.root}/",'') puts "Using param for #{type}: #{pretty_path}".color(:yellow) end end |
#render_erb(path) ⇒ Object
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# File 'lib/lono/param/generator.rb', line 171 def render_erb(path) return unless path if File.exist?(path) RenderMePretty.result(path, context: context) end end |
#source_exist? ⇒ Boolean
Checks both base and source path for existing of the param file. Example:
params/base/mystack.txt - base path
params/production/mystack.txt - source path
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# File 'lib/lono/param/generator.rb', line 128 def source_exist? @base_path && File.exist?(@base_path) || @env_path && File.exist?(@env_path) end |
#write_output(json) ⇒ Object
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# File 'lib/lono/param/generator.rb', line 239 def write_output(json) dir = File.dirname(output_path) FileUtils.mkdir_p(dir) IO.write(output_path, json) end |