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.



19
20
21
 
# File 'lib/traxor/rack/middleware/pre.rb', line 19

def initialize(app)
  @app = app
end

Instance Method Details

#call(env) ⇒ Object 



23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
 
# 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_request_metrics
  record_gc_metrics

  [status, headers, body]
end

#record_gc_metrics ⇒ Object 



52
53
54
55
56
57
58
59
60
61
62
63
 
# File 'lib/traxor/rack/middleware/pre.rb', line 52

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

  GC::Profiler.clear
end

#record_request_metrics ⇒ Object 



39
40
41
42
43
44
45
46
47
48
49
50
 
# File 'lib/traxor/rack/middleware/pre.rb', line 39

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