Class: Sfn::Command::Diff

Inherits:
Sfn::Command show all
Includes:
Sfn::CommandModule::Base, Sfn::CommandModule::Stack, Sfn::CommandModule::Template
Defined in:
lib/sfn/command/diff.rb

Overview

Diff command

Constant Summary

Constants included from Sfn::CommandModule::Template

Sfn::CommandModule::Template::DEFAULT_PROVIDER_NAME, Sfn::CommandModule::Template::MAX_PARAMETER_ATTEMPTS, Sfn::CommandModule::Template::TEMPLATE_IGNORE_DIRECTORIES

Constants inherited from Sfn::Command

CONFIG_BASE_NAME, VALID_CONFIG_EXTENSIONS

Instance Method Summary collapse

Methods included from Sfn::CommandModule::Stack

included

Methods included from Sfn::CommandModule::Template

included

Methods included from Sfn::CommandModule::Base

included

Methods inherited from Sfn::Command

#config, #initialize

Methods included from Sfn::CommandModule::Callbacks

#api_action!, #callbacks_for, #run_callbacks_for

Constructor Details

This class inherits a constructor from Sfn::Command

Instance Method Details

#diff_stack(stack, file, parent_names = []) ⇒ Object 



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# File 'lib/sfn/command/diff.rb', line 40

def diff_stack(stack, file, parent_names = [])
  stack_template = stack.template
  nested_stacks = Hash[
    file.fetch("Resources", file.fetch("resources", {})).find_all do |name, value|
      value.fetch("Properties", {})["Stack"]
    end
  ]
  nested_stacks.each do |name, value|
    n_stack = stack.nested_stacks(false).detect do |ns|
      ns.data[:logical_id] == name
    end
    if n_stack
      diff_stack(n_stack, value["Properties"]["Stack"], [*parent_names, stack.data.fetch(:logical_id, stack.name)].compact)
    end
    file["Resources"][name]["Properties"].delete("Stack")
  end

  ui.info "#{ui.color("Stack diff:", :bold)} #{ui.color((parent_names + [stack.data.fetch(:logical_id, stack.name)]).compact.join(" > "), :blue)}"

  stack_diff = HashDiff.diff(stack.template, file)

  if config[:raw_diff]
    ui.info "Dumping raw template diff:"
    require "pp"
    pp stack_diff
  else
    added_resources = stack_diff.find_all do |item|
      item.first == "+" && item[1].match(/Resources\.[^.]+$/)
    end
    removed_resources = stack_diff.find_all do |item|
      item.first == "-" && item[1].match(/Resources\.[^.]+$/)
    end
    modified_resources = stack_diff.find_all do |item|
      item[1].start_with?("Resources.") &&
        !item[1].end_with?("TemplateURL") &&
        !item[1].include?("Properties.Parameters")
    end - added_resources - removed_resources

    if added_resources.empty? && removed_resources.empty? && modified_resources.empty?
      ui.info "No changes detected"
      ui.puts
    else
      unless added_resources.empty?
        ui.info ui.color("Added Resources:", :green, :bold)
        added_resources.each do |item|
          ui.print ui.color("  -> #{item[1].split(".").last}", :green)
          ui.puts " [#{item[2]["Type"]}]"
        end
        ui.puts
      end

      unless modified_resources.empty?
        ui.info ui.color("Modified Resources:", :yellow, :bold)
        m_resources = Hash.new.tap do |hash|
          modified_resources.each do |item|
            _, key, path = item[1].split(".", 3)
            hash[key] ||= {}
            prefix, a_key = path.split(".", 2)
            hash[key][prefix] ||= []
            matched = hash[key][prefix].detect do |i|
              i[:path] == a_key
            end
            if matched
              if item.first == "-"
                matched[:original] = item[2]
              else
                matched[:new] = item[2]
              end
            else
              hash[key][prefix] << Hash.new.tap do |info|
                info[:path] = a_key
                case item.first
                when "~"
                  info[:original] = item[2]
                  info[:new] = item[3]
                when "+"
                  info[:new] = item[2]
                else
                  info[:original] = item[2]
                end
              end
            end
          end
        end.to_smash(:sorted).each do |key, value|
          ui.puts ui.color("  - #{key}", :yellow) + " [#{stack.template["Resources"][key]["Type"]}]"
          value.each do |prefix, items|
            ui.puts ui.color("    #{prefix}:", :bold)
            items.each do |item|
              original = item[:original].nil? ? ui.color("(none)", :yellow) : ui.color(item[:original].inspect, :red)
              new_val = item[:new].nil? ? ui.color("(deleted)", :red) : ui.color(item[:new].inspect, :green)
              ui.puts "      #{item[:path]}: #{original} -> #{new_val}"
            end
          end
        end
        ui.puts
      end

      unless removed_resources.empty?
        ui.info ui.color("Removed Resources:", :red, :bold)
        removed_resources.each do |item|
          ui.print ui.color("  <- #{item[1].split(".").last}", :red)
          ui.puts " [#{item[2]["Type"]}]"
        end
        ui.puts
      end

      run_callbacks_for(:after_stack_diff,
                        :diff => stack_diff,
                        :diff_info => {
                          :added => added_resources,
                          :modified => modified_resources,
                          :removed => removed_resources,
                        },
                        :api_stack => stack,
                        :new_template => file)
    end
  end
end

#execute! ⇒ Object

Diff the stack with existing stack



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# File 'lib/sfn/command/diff.rb', line 14

def execute!
  name_required!
  name = name_args.first

  begin
    stack = provider.stack(name)
  rescue Miasma::Error::ApiError::RequestError
    stack = nil
  end

  if stack
    config[:print_only] = true
    file = load_template_file
    file = parameter_scrub!(file.dump)

    ui.info "#{ui.color("SparkleFormation:", :bold)} #{ui.color("diff", :blue)} - #{name}"
    ui.puts

    diff_stack(stack, MultiJson.load(MultiJson.dump(file)).to_smash)
  else
    ui.fatal "Failed to locate requested stack: #{ui.color(name, :red, :bold)}"
    raise "Failed to locate stack: #{name}"
  end
end