Module: AppProfiler

Defined in:
lib/app_profiler/server.rb,
lib/app_profiler.rb,
lib/app_profiler/exec.rb,
lib/app_profiler/backend.rb,
lib/app_profiler/railtie.rb,
lib/app_profiler/sampler.rb,
lib/app_profiler/version.rb,
lib/app_profiler/middleware.rb,
lib/app_profiler/parameters.rb,
lib/app_profiler/base_profile.rb,
lib/app_profiler/yarn/command.rb,
lib/app_profiler/sampler/config.rb,
lib/app_profiler/vernier_profile.rb,
lib/app_profiler/stackprof_profile.rb,
lib/app_profiler/request_parameters.rb,
lib/app_profiler/viewer/base_viewer.rb,
lib/app_profiler/backend/base_backend.rb,
lib/app_profiler/storage/base_storage.rb,
lib/app_profiler/storage/file_storage.rb,
lib/app_profiler/yarn/with_speedscope.rb,
lib/app_profiler/viewer/firefox_viewer.rb,
lib/app_profiler/middleware/base_action.rb,
lib/app_profiler/middleware/view_action.rb,
lib/app_profiler/sampler/vernier_config.rb,
lib/app_profiler/viewer/base_middleware.rb,
lib/app_profiler/backend/vernier_backend.rb,
lib/app_profiler/middleware/upload_action.rb,
lib/app_profiler/sampler/stackprof_config.rb,
lib/app_profiler/viewer/speedscope_viewer.rb,
lib/app_profiler/backend/stackprof_backend.rb,
lib/app_profiler/yarn/with_firefox_profiler.rb,
lib/app_profiler/storage/google_cloud_storage.rb,
lib/app_profiler/viewer/firefox_remote_viewer.rb,
lib/app_profiler/viewer/speedscope_remote_viewer.rb,
lib/app_profiler/viewer/firefox_remote_viewer/middleware.rb,
lib/app_profiler/viewer/speedscope_remote_viewer/middleware.rb

Overview

This module provides a means to start a golang-inspired profile server it is implemented using stdlib and Rack to avoid additional dependencies

Defined Under Namespace

Modules: Backend, Exec, Sampler, Server, Storage, Viewer, Yarn Classes: BackendError, BaseProfile, ConfigurationError, Middleware, Parameters, Railtie, RequestParameters, StackprofProfile, VernierProfile

Constant Summary collapse

DefaultProfileFormatter = 
proc do |upload|
  "#{AppProfiler.speedscope_host}#profileURL=#{upload.url}"
end
DefaultProfilePrefix = 
proc do
  Time.zone.now.strftime("%Y%m%d-%H%M%S")
end
VERSION = 
"0.2.6"

Class Method Summary collapse

Class Method Details

.after_process_queue=(handler) ⇒ Object 



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# File 'lib/app_profiler.rb', line 207

def after_process_queue=(handler)
  if handler && (!handler.is_a?(Proc) || (handler.lambda? && handler.arity != 2))
    raise ArgumentError, "after_process_queue must be a proc or a lambda that accepts two arguments"
  end

  @@after_process_queue = handler # rubocop:disable Style/ClassVars
end

.backend ⇒ Object 



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# File 'lib/app_profiler.rb', line 165

def backend
  profiler_backend.name
end

.backend=(new_backend) ⇒ Object 



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# File 'lib/app_profiler.rb', line 112

def backend=(new_backend)
  return if (new_profiler_backend = backend_for(new_backend)) == profiler_backend

  if running?
    raise BackendError,
      "cannot change backend to #{new_backend} while #{backend} backend is running"
  end

  clear
  @profiler_backend = new_profiler_backend
end

.backend_for(backend_name) ⇒ Object 



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# File 'lib/app_profiler.rb', line 154

def backend_for(backend_name)
  if vernier_supported? &&
      backend_name&.to_sym == AppProfiler::Backend::VernierBackend.name
    AppProfiler::Backend::VernierBackend
  elsif backend_name&.to_sym == AppProfiler::Backend::StackprofBackend.name
    AppProfiler::Backend::StackprofBackend
  else
    raise BackendError, "unknown backend #{backend_name.inspect}"
  end
end

.deprecator ⇒ Object

:nodoc:



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# File 'lib/app_profiler.rb', line 75

def deprecator # :nodoc:
  @deprecator ||= ActiveSupport::Deprecation.new("in future releases", "app_profiler")
end

.profile_data_header ⇒ Object 



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# File 'lib/app_profiler.rb', line 183

def profile_data_header
  @@profile_data_header ||= profile_header.dup << "-Data" # rubocop:disable Style/ClassVars
end

.profile_enqueue_failure=(handler) ⇒ Object 



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# File 'lib/app_profiler.rb', line 199

def profile_enqueue_failure=(handler)
  if handler && (!handler.is_a?(Proc) || (handler.lambda? && handler.arity != 1))
    raise ArgumentError, "profile_enqueue_failure must be a proc or a lambda that accepts one argument"
  end

  @@profile_enqueue_failure = handler # rubocop:disable Style/ClassVars
end

.profile_enqueue_success=(handler) ⇒ Object 



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# File 'lib/app_profiler.rb', line 191

def profile_enqueue_success=(handler)
  if handler && (!handler.is_a?(Proc) || (handler.lambda? && handler.arity != 0))
    raise ArgumentError, "profile_enqueue_success must be proc or a lambda that accepts no argument"
  end

  @@profile_enqueue_success = handler # rubocop:disable Style/ClassVars
end

.profile_header=(profile_header) ⇒ Object 



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# File 'lib/app_profiler.rb', line 173

def profile_header=(profile_header)
  @@profile_header = profile_header # rubocop:disable Style/ClassVars
  @@request_profile_header = nil    # rubocop:disable Style/ClassVars
  @@profile_data_header = nil       # rubocop:disable Style/ClassVars
end

.profile_sampler_enabled ⇒ Object 



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# File 'lib/app_profiler.rb', line 143

def profile_sampler_enabled
  return false unless defined?(@profile_sampler_enabled)

  @profile_sampler_enabled.is_a?(Proc) ? @profile_sampler_enabled.call : @profile_sampler_enabled
rescue => e
  logger.error(
    "[AppProfiler.profile_sampler_enabled] exception: #{e}, message: #{e.message}",
  )
  false
end

.profile_sampler_enabled=(value) ⇒ Object 



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# File 'lib/app_profiler.rb', line 132

def profile_sampler_enabled=(value)
  if value.is_a?(Proc)
    raise ArgumentError,
      "profile_sampler_enabled must be a proc or a lambda that accepts no argument" if value.arity != 0
  else
    raise ArgumentError, "Must be TrueClass or FalseClass" unless [TrueClass, FalseClass].include?(value.class)
  end

  @profile_sampler_enabled = value
end

.profile_url(upload) ⇒ Object 



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# File 'lib/app_profiler.rb', line 215

def profile_url(upload)
  return unless AppProfiler.profile_url_formatter

  AppProfiler.profile_url_formatter.call(upload)
end

.profile_url_formatter=(block) ⇒ Object 



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# File 'lib/app_profiler.rb', line 187

def profile_url_formatter=(block)
  @@profile_url_formatter = block # rubocop:disable Style/ClassVars
end

.profiler ⇒ Object 



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# File 'lib/app_profiler.rb', line 108

def profiler
  @profiler ||= profiler_backend.new
end

.request_profile_header ⇒ Object 



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# File 'lib/app_profiler.rb', line 179

def request_profile_header
  @@request_profile_header ||= profile_header.upcase.tr("-", "_").prepend("HTTP_") # rubocop:disable Style/ClassVars
end

.run(*args, backend: nil, **kwargs, &block) ⇒ Object 



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# File 'lib/app_profiler.rb', line 79

def run(*args, backend: nil, **kwargs, &block)
  if backend
    original_backend = self.backend
    self.backend = backend
  end
  profiler.run(*args, **kwargs, &block)
rescue BackendError => e
  logger.error(
    "[AppProfiler.run] exception #{e} configuring backend #{backend}: #{e.message}",
  )
  yield
ensure
  self.backend = original_backend if backend
end

.running? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/app_profiler.rb', line 104

def running?
  @profiler&.running?
end

.stackprof_viewer ⇒ Object 



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# File 'lib/app_profiler.rb', line 124

def stackprof_viewer
  @@stackprof_viewer ||= Viewer::SpeedscopeViewer # rubocop:disable Style/ClassVars
end

.start(*args, backend: nil, **kwargs) ⇒ Object 



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# File 'lib/app_profiler.rb', line 94

def start(*args, backend: nil, **kwargs)
  self.backend = backend if backend
  profiler.start(*args, **kwargs)
end

.stop ⇒ Object 



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# File 'lib/app_profiler.rb', line 99

def stop
  profiler.stop
  profiler.results.tap { clear }
end

.vernier_supported? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/app_profiler.rb', line 169

def vernier_supported?
  RUBY_VERSION >= "3.2.1"
end

.vernier_viewer ⇒ Object 



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# File 'lib/app_profiler.rb', line 128

def vernier_viewer
  @@vernier_viewer ||= Viewer::FirefoxViewer # rubocop:disable Style/ClassVars
end

.viewer ⇒ Object 



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# File 'lib/app_profiler.rb', line 221

def viewer
  deprecator.warn("AppProfiler.viewer is deprecated, please use stackprof_viewer instead.")
  stackprof_viewer
end

.viewer=(viewer) ⇒ Object 



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# File 'lib/app_profiler.rb', line 226

def viewer=(viewer)
  deprecator.warn("AppProfiler.viewer= is deprecated, please use stackprof_viewer= instead.")
  self.stackprof_viewer = viewer
end