Module: AppMap::ValueInspector

Extended by:
ValueInspector
Included in:
Event::MethodEvent, ValueInspector
Defined in:
lib/appmap/value_inspector.rb

Constant Summary collapse

MAX_DEPTH = 
ENV.fetch('APPMAP_PROPERTY_MAX_DEPTH', 3).to_i
MAX_ARRAY_ELEMENTS = 
ENV.fetch('APPMAP_PROPERTY_MAX_ARRAY_ELEMENTS', 5).to_i

Instance Method Summary collapse

Instance Method Details

#best_class_name(value) ⇒ Object

Heuristic for dynamically defined class whose name can be nil



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# File 'lib/appmap/value_inspector.rb', line 55

def best_class_name(value)
  value_cls = value.class
  while value_cls && value_cls.name.nil?
    value_cls = value_cls.superclass
  end
  value_cls&.name || "unknown"
end

#detect_schema(value, max_depth: MAX_DEPTH, max_array_elements: MAX_ARRAY_ELEMENTS, type_info: { class: best_class_name(value) }, observed_values: Set.new, depth: 0) ⇒ Object 



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# File 'lib/appmap/value_inspector.rb', line 15

def detect_schema(
  value,
  max_depth: MAX_DEPTH,
  max_array_elements: MAX_ARRAY_ELEMENTS,
  type_info: { class: best_class_name(value) },
  observed_values: Set.new,
  depth: 0
)
  return type_info if depth >= max_depth && !array_like?(value)

  if hash_like?(value)
    return if observed_values.include?(value.object_id)

    observed_values << value.object_id

    properties = value.keys.select { |key| key != "" && !key.nil? }.map do |key|
      next_value = value[key]

      value_schema = begin
        { name: key, class: best_class_name(next_value) }
      rescue
        warn "Error in add_schema(#{next_value.class})", $!
        raise
      end

      detect_schema(next_value, **{ max_depth: max_depth, type_info: value_schema, observed_values: observed_values, depth: depth + 1 })
    end.compact
    type_info[:properties] = properties unless properties.empty?
  elsif array_like?(value)
    type_info[:items] = value.take(max_array_elements).map do |next_value|
      value_schema = { class: best_class_name(next_value) }
      detect_schema(next_value, **{ max_depth: max_depth, type_info: value_schema, observed_values: observed_values, depth: depth + 1 })
    end

    type_info[:items] = type_info[:items].compact.uniq(&:hash)
  end
  type_info
end

#detect_size(value) ⇒ Object 



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# File 'lib/appmap/value_inspector.rb', line 8

def detect_size(value)
  # Don't risk calling #size on things like data-access objects, which can and will issue queries for this information.
  if (value.is_a?(Array) || value.is_a?(Hash)) && value.respond_to?(:size)
    value.size
  end
end