Module: Sfn::Command::Graph::Provider::Terraform

Defined in:
lib/sfn/command/graph/terraform.rb

Defined Under Namespace

Classes: TerraformGraphProcessor

Instance Method Summary collapse

Instance Method Details

#edge_detection(template, graph, name = "", resource_names = []) ⇒ Object 



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# File 'lib/sfn/command/graph/terraform.rb', line 123

def edge_detection(template, graph, name = "", resource_names = [])
  resources = (template.fetch("resources", {}) || {})
  node_prefix = name
  resources.each do |resource_name, resource_data|
    node_name = [node_prefix, resource_name].join("__")
    if resource_data["type"] == "module"
      graph.subgraph << generate_graph(
        resource_data["properties"].delete("stack"),
        :name => resource_name,
        :type => resource_data["type"],
        :resource_names => resource_names,
      )
      next
    else
      graph.node(node_name).attributes << graph.fillcolor(colorize(node_prefix.empty? ? config[:file] : node_prefix).inspect)
      graph.box3d << graph.node(node_name)
    end
    graph.filled << graph.node(node_name)
    graph.node(node_name).label "#{resource_name}\n<#{resource_data["type"]}>\n#{name}"
    resource_dependencies(resource_data, resource_names + resources.keys).each do |dep_name|
      if resources.keys.include?(dep_name)
        dep_name = [node_prefix, dep_name].join("__")
      end
      if config[:graph_style] == "creation"
        @root_graph.edge(dep_name, node_name)
      else
        @root_graph.edge(node_name, dep_name)
      end
    end
  end
  resource_names.concat resources.keys.map { |r_name| [node_prefix, r_name].join("__") }
end

#output_discovery(template, outputs, resource_name, parent_template, name = "") ⇒ Object 



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# File 'lib/sfn/command/graph/terraform.rb', line 64

def output_discovery(template, outputs, resource_name, parent_template, name = "")
  if template["resources"]
    template["resources"].keys.each do |r_name|
      r_info = template["resources"][r_name]
      if r_info["type"] == "module"
        output_discovery(r_info["properties"]["stack"], outputs, r_name, template, r_name)
      end
    end
  end
  if parent_template
    ui.debug "Pre-processing stack resource `#{resource_name}`"
    substack_parameters = Smash[
      parent_template.fetch("resources", resource_name, "properties", "parameters", {}).map do |key, value|
        result = [key, value]
        if value.to_s.start_with?("${module.")
          output_key = value.sub("${module.", "").sub("}", "").sub(".", "__")
          ui.debug "Output key for check: #{output_key}"
          if outputs.key?(output_key)
            new_value = outputs[output_key]
            result = [key, new_value]
            ui.debug "Parameter for output swap `#{key}`: #{value} -> #{new_value}"
          end
        end
        result
      end
    ]

    ui.debug "Generated internal parameters for `#{resource_name}`: #{substack_parameters}"

    processor = TerraformGraphProcessor.new({},
                                            :parameters => substack_parameters)
    template["resources"] = processor.dereference_processor(
      template["resources"], []
    )
    template["outputs"] = processor.dereference_processor(
      template["outputs"], []
    )
    derefed_outs = template["outputs"] || {}
    derefed_outs.each do |o_name, o_data|
      o_key = [name, o_name].join("__")
      val = o_data["value"]
      if val.start_with?("${") && val.scan(".").count == 2
        val = val.split(".")
        val[1] = "#{name}__#{val[1]}"
        val = val.join(".")
      end
      outputs[o_key] = val
    end
  end
  outputs.dup.each do |key, value|
    if value.to_s.start_with?("${module.")
      output_key = value.to_s.sub("${module.", "").sub("}", "").sub(".", "__")
      if outputs.key?(output_key)
        outputs[key] = outputs[output_key]
      end
    end
  end
end

#resource_dependencies(data, names) ⇒ Object 



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# File 'lib/sfn/command/graph/terraform.rb', line 156

def resource_dependencies(data, names)
  case data
  when String
    result = []
    if data.start_with?("${") && data.scan(".").count >= 1
      data = data.tr("${}", "")
      check_name = data.split(".")[1]
      if names.include?(check_name)
        result.push(check_name)
      end
    end
    result
  when Hash
    data.map do |key, value|
      if key == "depends_on"
        [value].flatten.compact.map do |dependson_name|
          dep_name = dependson_name.split(".").last
          dep_name if names.include?(dep_name)
        end
      else
        resource_dependencies(key, names) +
        resource_dependencies(value, names)
      end
    end.flatten.compact.uniq
  when Array
    data.map do |item|
      resource_dependencies(item, names)
    end.flatten.compact.uniq
  else
    []
  end
end