Class: RenderGuardian::HelperTracker

Inherits:
Object
  • Object
show all
Defined in:
lib/render_guardian/helper_tracker.rb

Instance Method Summary collapse

Constructor Details

#initialize(profiler) ⇒ HelperTracker

Returns a new instance of HelperTracker.



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# File 'lib/render_guardian/helper_tracker.rb', line 5

def initialize(profiler)
  @profiler = profiler
end

Instance Method Details

#analyze ⇒ Object 



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# File 'lib/render_guardian/helper_tracker.rb', line 9

def analyze
  helper_stats = Hash.new { |h, k| h[k] = { count: 0, total_ms: 0, templates: [] } }
  max_ms = @profiler.budget.limit_for(:max_helper_time_ms)

  # Track helper calls from events that have helper timing data
  @profiler.events.each do |event|
    Array(event.helpers_called).each do |h|
      name = h.is_a?(Hash) ? h[:name].to_s : h.to_s
      time = h.is_a?(Hash) ? h[:time_ms].to_f : 0
      helper_stats[name][:count] += 1
      helper_stats[name][:total_ms] += time
      helper_stats[name][:templates] << event.template unless helper_stats[name][:templates].include?(event.template)
    end
  end

  findings = []
  helper_stats.each do |name, stats|
    avg = stats[:total_ms] / stats[:count]
    if avg > max_ms
      findings << {
        type:       :slow_helper,
        severity:   :medium,
        helper:     name,
        avg_ms:     avg.round(2),
        total_ms:   stats[:total_ms].round(2),
        count:      stats[:count],
        templates:  stats[:templates],
        message:    "Helper '#{name}' averages #{avg.round(2)}ms (limit: #{max_ms}ms), called #{stats[:count]} times"
      }
    end
  end

  findings
end