Class: Traxor::Rack::Middleware::Pre

Inherits:
Object
  • Object
show all
Defined in:
lib/traxor/rack/middleware/pre.rb

Constant Summary collapse

MIDDLEWARE_METRIC = 
'rack.request.middleware.duration'
DURATION_METRIC = 
'rack.request.duration'
QUEUE_METRIC = 
'rack.request.queue.duration'
REQUEST_COUNT_METRIC = 
'rack.request.count'
GC_DURATION_METRIC = 
'ruby.gc.duration'
GC_COUNT_METRIC = 
'ruby.gc.count'
MAJOR_METRIC = 
'ruby.gc.major.count'
MINOR_METRIC = 
'ruby.gc.minor.count'
ALLOCATED_METRIC = 
'ruby.gc.allocated_objects.count'

Instance Method Summary collapse

Constructor Details

#initialize(app) ⇒ Pre

Returns a new instance of Pre.



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# File 'lib/traxor/rack/middleware/pre.rb', line 19

def initialize(app)
  @app = app
end

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/traxor/rack/middleware/pre.rb', line 23

def call(env)
  Middleware.request_start_at = QueueTime.parse(env)

  Middleware.pre_start_at = Time.now.utc
  GC::Profiler.enable
  Middleware.gc_stat_before = GC.stat
  status, headers, body = @app.call(env)
  Middleware.gc_stat_after = GC.stat
  Middleware.post_finish_at = Time.now.utc

  record_metrics

  [status, headers, body]
end

#record_gc_metrics(line) ⇒ Object 



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# File 'lib/traxor/rack/middleware/pre.rb', line 58

def record_gc_metrics(line)
  total_gc_time = (GC::Profiler.total_time * 1_000).to_f
  line.measure GC_DURATION_METRIC, "#{total_gc_time.round(2)}ms" if total_gc_time.positive?
  line.count GC_COUNT_METRIC, Middleware.gc_count
  line.count MAJOR_METRIC, Middleware.gc_major_count
  line.count MINOR_METRIC, Middleware.gc_minor_count
  line.count ALLOCATED_METRIC, Middleware.gc_allocated_objects_count

  GC::Profiler.clear
end

#record_metrics ⇒ Object 



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# File 'lib/traxor/rack/middleware/pre.rb', line 38

def record_metrics
  Metric::Line.record do |l|
    record_request_metrics(l)
    record_gc_metrics(l)
  end
end

#record_request_metrics(line) ⇒ Object 



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# File 'lib/traxor/rack/middleware/pre.rb', line 45

def record_request_metrics(line)
  if Middleware.middleware_total.positive?
    line.measure MIDDLEWARE_METRIC, "#{Middleware.middleware_total.round(2)}ms"
  end
  if Middleware.request_total.positive?
    line.measure DURATION_METRIC, "#{Middleware.request_total.round(2)}ms"
  end
  if Middleware.request_queue_total.positive?
    line.measure QUEUE_METRIC, "#{Middleware.request_queue_total.round(2)}ms"
  end
  line.count REQUEST_COUNT_METRIC, 1
end