Module: Oboe::Util

Defined in:
lib/oboe/util.rb,
lib/oboe/loading.rb

Overview

Provides utility methods for use while in the business of instrumenting code

Defined Under Namespace

Modules: Base64URL

Class Method Summary collapse

Class Method Details

.build_init_report ⇒ Object

build_report

Internal: Build a hash of KVs that reports on the status of the running environment. This is used on stack boot in __Init reporting and for Oboe.support_report.



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# File 'lib/oboe/util.rb', line 130

def build_init_report
  platform_info = { '__Init' => 1 }

  begin
    platform_info['Force']                   = true
    platform_info['Ruby.Platform.Version']   = RUBY_PLATFORM
    platform_info['Ruby.Version']            = RUBY_VERSION
    platform_info['Ruby.Oboe.Version']       = ::Oboe::Version::STRING
    platform_info['RubyHeroku.Oboe.Version'] = ::OboeHeroku::Version::STRING if defined?(::OboeHeroku)

    # Report the framework in use
    if defined?(::RailsLts)
      platform_info['Ruby.RailsLts.Version'] = "RailsLts-#{::RailsLts::VERSION}"
    elsif defined?(::Rails)
      platform_info['Ruby.Rails.Version']    = "Rails-#{::Rails.version}"
    end
    platform_info['Ruby.Grape.Version']    = "Grape-#{::Grape::VERSION}" if defined?(::Grape)
    platform_info['Ruby.Cramp.Version']    = "Cramp-#{::Cramp::VERSION}" if defined?(::Cramp)

    if defined?(::Padrino)
      platform_info['Ruby.Padrino.Version'] = "Padrino-#{::Padrino::VERSION}"
    elsif defined?(::Sinatra)
      platform_info['Ruby.Sinatra.Version'] = "Sinatra-#{::Sinatra::VERSION}"
    end

    # Report the instrumented libraries
    platform_info['Ruby.Cassandra.Version'] = "Cassandra-#{::Cassandra.VERSION}" if defined?(::Cassandra)
    platform_info['Ruby.Dalli.Version']     = "Dalli-#{::Dalli::VERSION}"        if defined?(::Dalli)
    platform_info['Ruby.Faraday.Version']   = "Faraday-#{::Faraday::VERSION}"    if defined?(::Faraday)
    platform_info['Ruby.MemCache.Version']  = "MemCache-#{::MemCache::VERSION}"  if defined?(::MemCache)
    platform_info['Ruby.Moped.Version']     = "Moped-#{::Moped::VERSION}"        if defined?(::Moped)
    platform_info['Ruby.Redis.Version']     = "Redis-#{::Redis::VERSION}"        if defined?(::Redis)
    platform_info['Ruby.Resque.Version']    = "Resque-#{::Resque::VERSION}"      if defined?(::Resque)

    # Special case since the Mongo 1.x driver doesn't embed the version number in the gem directly
    if ::Gem.loaded_specs.key?('mongo')
      platform_info['Ruby.Mongo.Version']     = "Mongo-#{::Gem.loaded_specs['mongo'].version}"
    end

    # Report the server in use (if possible)
    if defined?(::Unicorn)
      platform_info['Ruby.AppContainer.Version'] = "Unicorn-#{::Unicorn::Const::UNICORN_VERSION}"
    elsif defined?(::Puma)
      platform_info['Ruby.AppContainer.Version'] = "Puma-#{::Puma::Const::PUMA_VERSION} (#{::Puma::Const::CODE_NAME})"
    elsif defined?(::PhusionPassenger)
      platform_info['Ruby.AppContainer.Version'] = "#{::PhusionPassenger::PACKAGE_NAME}-#{::PhusionPassenger::VERSION_STRING}"
    elsif defined?(::Thin)
      platform_info['Ruby.AppContainer.Version'] = "Thin-#{::Thin::VERSION::STRING} (#{::Thin::VERSION::CODENAME})"
    elsif defined?(::Mongrel)
      platform_info['Ruby.AppContainer.Version'] = "Mongrel-#{::Mongrel::Const::MONGREL_VERSION}"
    elsif defined?(::Mongrel2)
      platform_info['Ruby.AppContainer.Version'] = "Mongrel2-#{::Mongrel2::VERSION}"
    elsif defined?(::Trinidad)
      platform_info['Ruby.AppContainer.Version'] = "Trinidad-#{::Trinidad::VERSION}"
    elsif defined?(::WEBrick)
      platform_info['Ruby.AppContainer.Version'] = "WEBrick-#{::WEBrick::VERSION}"
    else
      platform_info['Ruby.AppContainer.Version'] = File.basename($PROGRAM_NAME)
    end

  rescue StandardError, ScriptError => e
    # Also rescue ScriptError (aka SyntaxError) in case one of the expected
    # version defines don't exist

    platform_info['Error'] = "Error in build_report: #{e.message}"

    Oboe.logger.warn "[oboe/warn] Error in build_init_report: #{e.message}"
    Oboe.logger.debug e.backtrace
  end
  platform_info
end

.class_method_alias(cls, method, name = nil) ⇒ Object

class_method_alias

Centralized utility method to alias a class method on an arbitrary class or module



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# File 'lib/oboe/util.rb', line 59

def class_method_alias(cls, method, name = nil)
  name ||= contextual_name(cls)

  if cls.singleton_methods.include? method.to_sym

    # Strip '!' or '?' from method if present
    safe_method_name = method.to_s.chop if method.to_s =~ /\?$|\!$/
    safe_method_name ||= method

    without_oboe = "#{safe_method_name}_without_oboe"
    with_oboe    = "#{safe_method_name}_with_oboe"

    # Only alias if we haven't done so already
    unless cls.singleton_methods.include? without_oboe.to_sym
      cls.singleton_class.send(:alias_method, without_oboe, "#{method}")
      cls.singleton_class.send(:alias_method, "#{method}", with_oboe)
    end
  else Oboe.logger.warn "[oboe/loading] Couldn't properly instrument #{name}.  Partial traces may occur."
  end
end

.contextual_name(cls) ⇒ Object 



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# File 'lib/oboe/util.rb', line 10

def contextual_name(cls)
  # Attempt to infer a contextual name if not indicated
  #
  # For example:
  # ::ActiveRecord::ConnectionAdapters::AbstractMysqlAdapter.to_s.split(/::/).last
  # => "AbstractMysqlAdapter"
  #
  cls.to_s.split(/::/).last
rescue
  cls
end

.method_alias(cls, method, name = nil) ⇒ Object

method_alias

Centralized utility method to alias a method on an arbitrary class or module.



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# File 'lib/oboe/util.rb', line 28

def method_alias(cls, method, name = nil)
  name ||= contextual_name(cls)

  if cls.method_defined?(method.to_sym) || cls.private_method_defined?(method.to_sym)

    # Strip '!' or '?' from method if present
    safe_method_name = method.to_s.chop if method.to_s =~ /\?$|\!$/
    safe_method_name ||= method

    without_oboe = "#{safe_method_name}_without_oboe"
    with_oboe    = "#{safe_method_name}_with_oboe"

    # Only alias if we haven't done so already
    unless cls.method_defined?(without_oboe.to_sym) ||
      cls.private_method_defined?(without_oboe.to_sym)

      cls.class_eval do
        alias_method without_oboe, "#{method}"
        alias_method "#{method}", with_oboe
      end
    end
  else Oboe.logger.warn "[oboe/loading] Couldn't properly instrument #{name}.  Partial traces may occur."
  end
end

.prettify(x) ⇒ Object

prettify

Even to my surprise, ‘prettify’ is a real word: transitive v. To make pretty or prettier, especially in a superficial or insubstantial way.

from The American Heritage Dictionary of the English Language, 4th Edition

This method makes things ‘purty’ for reporting.



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# File 'lib/oboe/util.rb', line 116

def prettify(x)
  if (x.to_s =~ /^#</) == 0
    x.class.to_s
  else
    x.to_s
  end
end

.send_extend(target_cls, cls) ⇒ Object

send_extend

Centralized utility method to send an extend call for an arbitrary class



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# File 'lib/oboe/util.rb', line 85

def send_extend(target_cls, cls)
  target_cls.send(:extend, cls) if defined?(target_cls)
end

.send_include(target_cls, cls) ⇒ Object

send_include

Centralized utility method to send a include call for an arbitrary class



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# File 'lib/oboe/util.rb', line 94

def send_include(target_cls, cls)
  target_cls.send(:include, cls) if defined?(target_cls)
end

.static_asset?(path) ⇒ Boolean

static_asset?

Given a path, this method determines whether it is a static asset or not (based solely on filename)

Returns:

  • (Boolean) 


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# File 'lib/oboe/util.rb', line 104

def static_asset?(path)
  (path =~ /\.(jpg|jpeg|gif|png|ico|css|zip|tgz|gz|rar|bz2|pdf|txt|tar|wav|bmp|rtf|js|flv|swf|ttf|woff|svg|less)$/i)
end