Class: Decidim::Api::RecursionAnalyzer

Inherits:
GraphQL::Analysis::AST::Analyzer
  • Object
show all
Defined in:
lib/decidim/api/recursion_analyzer.rb

Constant Summary collapse

IGNORED_FIELDS = 
%w(node edges nodes ofType).freeze
RECURSION_THRESHOLD = 
2

Instance Method Summary collapse

Constructor Details

#initialize(query) ⇒ RecursionAnalyzer

Returns a new instance of RecursionAnalyzer.



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# File 'lib/decidim/api/recursion_analyzer.rb', line 16

def initialize(query)
  super

  @node_visits = {}
  @recurring_fields = {}
end

Instance Method Details

#on_enter_field(node, _parent, visitor) ⇒ Object 



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# File 'lib/decidim/api/recursion_analyzer.rb', line 23

def on_enter_field(node, _parent, visitor)
  return if skip_node?(node, visitor)

  node_name = node.name
  node_visits[node_name] ||= 0
  node_visits[node_name] += 1

  times_encountered = @node_visits[node_name]
  recurring_fields[node_name] = times_encountered if recursion_too_deep?(node_name, times_encountered)
end

#on_leave_field(node, _parent, visitor) ⇒ Object

Visitors are all defined on the AST::Analyzer base class We override them for custom analyzers.



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# File 'lib/decidim/api/recursion_analyzer.rb', line 36

def on_leave_field(node, _parent, visitor)
  return if skip_node?(node, visitor)

  node_name = node.name
  node_visits[node_name] ||= 0
  node_visits[node_name] -= 1
end

#result ⇒ Object 



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# File 'lib/decidim/api/recursion_analyzer.rb', line 44

def result
  @recurring_fields = @recurring_fields.select { |k, v| recursion_too_deep?(k, v) }

  Decidim::Api::Errors::RecursionLimitExceededError.new I18n.t("decidim.api.errors.recursion_limit_exceeded_error") if @recurring_fields.any?
end