GraphQL Appsignal

# query_timer_instrumentation.rb
module QueryTimerInstrumentation
  module_function

  def before_query(_query)
    @start_time = Time.now.to_i
  end

  def after_query(query)
    end_time = Time.now.to_i
    elapsed_time = end_time - @start_time
    operation = begin
                  query.selected_operation.selections.first.name
                rescue StandardError
                  nil
                end
    Appsignal.add_distribution_value('graphql', elapsed_time, operation: operation) if operation
  end
end

# fepra_api_schema.rb
class FepraApiSchema < GraphQL::Schema
  use(GraphQL::Tracing::AppsignalTracing)
  instrument(:query, QueryTimerInstrumentation)

  MAX_PAGE_SIZE = 50
  MAX_DEPTH = 50
  MAX_COMPLEXITY = 50

  max_depth MAX_DEPTH

  mutation(Types::MutationType)
  query(Types::QueryType)

  # disables encoding - there's no advantages of using base64 on cursors
  cursor_encoder(CustomEncoder)

  if Rails.env.development? || Rails.env.staging?
    log_query_complexity = GraphQL::Analysis::QueryComplexity.new do |query, complexity|
      operation = begin
                  query.selected_operation.selections.first.name
                rescue StandardError
                  nil
                end
      Appsignal.add_distribution_value('complexity', complexity, operation: operation) if operation
    end
    query_analyzer(log_query_complexity)
  end
end