Class: SimplyGenius::Atmos::Plugins::JsonDiff

Inherits:
OutputFilter
  • Object
show all
Defined in:
lib/simplygenius/atmos/plugins/json_diff.rb

Instance Attribute Summary

Attributes inherited from OutputFilter

#context

Instance Method Summary collapse

Methods inherited from OutputFilter

#close

Methods included from UI

#agree, #ask, #choose, color_enabled, color_enabled=, #display, #error, #notify, #say, #warn

Constructor Details

#initialize(context) ⇒ JsonDiff

Returns a new instance of JsonDiff.



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# File 'lib/simplygenius/atmos/plugins/json_diff.rb', line 14

def initialize(context)
  super
  @plan_detected = false
  @json_data = ""
end

Instance Method Details

#filter(data, flushing: false) ⇒ Object 



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# File 'lib/simplygenius/atmos/plugins/json_diff.rb', line 20

def filter(data, flushing: false)

  # If we are flushing and never saw a json end, then flush the data we have buffered
  if flushing && @saving_json
    buffer = @json_data + data
    @json_data = ""
    return buffer
  end

  # TODO: roll up plan detection so we don't have many plugins doing the same regexp match
  if data =~ /^[\e\[\dm\s]*Terraform will perform the following actions:[\e\[\dm\s]*$/
    @plan_detected = true
  end

  if @plan_detected

    if data =~ /^.*:\s*"[\[\{]/
      @saving_json = true
    end

    if @saving_json
      @json_data << data

      if data =~ /[\]\}][\s\\n]*[^\\]"[^"]*$/
        @saving_json = false
        with_diff = @json_data.sub(/^(.*:\s*)"([\[\{].*[\]\}])[\s\\n]*"\s*=>\s*"([\[\{].*[\]\}])[\s\\n]*"(.*)$/) do |m|
          begin
            "#{$1}\n#{jsondiff($2, $3)}\n#{$4}"
          rescue JSON::ParserError => e
            logger.warn("Failed to parse JSON for diff: #{e.message}")
            "#{$1}\n\n#{$2}\n\n=>\n\n#{$3}\n\n#{$4}"
          end
        end
        @json_data = ""
        return with_diff
      end

      return ""
    end

  end

  data
end

#jsondiff(lhs, rhs) ⇒ Object 



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# File 'lib/simplygenius/atmos/plugins/json_diff.rb', line 69

def jsondiff(lhs, rhs)
  lhs = unescape(lhs)
  rhs = unescape(rhs)

  jl = JSON.parse(lhs).deep_sort
  jr = JSON.parse(rhs).deep_sort

  sl = JSON.pretty_generate(jl)
  sr = JSON.pretty_generate(jr)

  if sl == sr
    result = "No differences"
  else
    result = Diffy::Diff.new("#{sl}\n", "#{sr}\n").to_s
  end

  result
end

#unescape(s) ⇒ Object 



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# File 'lib/simplygenius/atmos/plugins/json_diff.rb', line 65

def unescape(s)
  YAML.load(%Q(---\n"#{s}"\n))
end