Class: Sentry::Vernier::Profiler

Inherits:
Object
  • Object
show all
Defined in:
lib/sentry/vernier/profiler.rb

Constant Summary collapse

EMPTY_RESULT = 
{}.freeze

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(configuration) ⇒ Profiler

Returns a new instance of Profiler.



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# File 'lib/sentry/vernier/profiler.rb', line 14

def initialize(configuration)
  @event_id = SecureRandom.uuid.delete("-")

  @started = false
  @sampled = nil

  @profiling_enabled = defined?(Vernier) && configuration.profiling_enabled?
  @profiles_sample_rate = configuration.profiles_sample_rate
  @project_root = configuration.project_root
  @app_dirs_pattern = configuration.app_dirs_pattern
  @in_app_pattern = Regexp.new("^(#{@project_root}/)?#{@app_dirs_pattern}")
end

Instance Attribute Details

#event_id ⇒ Object (readonly)

Returns the value of attribute event_id.



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# File 'lib/sentry/vernier/profiler.rb', line 12

def event_id
  @event_id
end

#result ⇒ Object (readonly)

Returns the value of attribute result.



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# File 'lib/sentry/vernier/profiler.rb', line 12

def result
  @result
end

#started ⇒ Object (readonly)

Returns the value of attribute started.



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# File 'lib/sentry/vernier/profiler.rb', line 12

def started
  @started
end

Instance Method Details

#active_thread_id ⇒ Object 



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# File 'lib/sentry/vernier/profiler.rb', line 82

def active_thread_id
  Thread.current.object_id
end

#set_initial_sample_decision(transaction_sampled) ⇒ Object 



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# File 'lib/sentry/vernier/profiler.rb', line 27

def set_initial_sample_decision(transaction_sampled)
  unless @profiling_enabled
    @sampled = false
    return
  end

  unless transaction_sampled
    @sampled = false
    log("Discarding profile because transaction not sampled")
    return
  end

  case @profiles_sample_rate
  when 0.0
    @sampled = false
    log("Discarding profile because sample_rate is 0")
    return
  when 1.0
    @sampled = true
    return
  else
    @sampled = Random.rand < @profiles_sample_rate
  end

  log("Discarding profile due to sampling decision") unless @sampled
end

#start ⇒ Object 



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# File 'lib/sentry/vernier/profiler.rb', line 54

def start
  return unless @sampled
  return if @started

  ::Vernier.start_profile
  @started = true

  log("Started")

  @started
rescue RuntimeError => e
  # TODO: once Vernier raises something more dedicated, we should catch that instead
  if e.message.include?("Profile already started")
    log("Not started since running elsewhere")
  else
    log("Failed to start: #{e.message}")
  end
end

#stop ⇒ Object 



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# File 'lib/sentry/vernier/profiler.rb', line 73

def stop
  return unless @sampled
  return unless @started

  @result = ::Vernier.stop_profile

  log("Stopped")
end

#to_hash ⇒ Object 



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# File 'lib/sentry/vernier/profiler.rb', line 86

def to_hash
  return EMPTY_RESULT unless @started

  unless @sampled
    record_lost_event(:sample_rate)
    return EMPTY_RESULT
  end

  { **profile_meta, profile: output.to_h }
end