Class: Rack::Bug::SpeedTrace::Tracer

Inherits:
TraceRecord show all
Defined in:
lib/rack/bug/speedtracer/tracer.rb

Instance Method Summary collapse

Methods inherited from TraceRecord

#duration, #time_in_children, #to_json

Methods included from Render

#compiled_source

Constructor Details

#initialize(id, method, uri) ⇒ Tracer

Returns a new instance of Tracer.



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# File 'lib/rack/bug/speedtracer/tracer.rb', line 88

def initialize(id, method, uri)
  super(id)

  @method = method
  @uri = uri
  @event_id = 0
  @pstack = []
end

Instance Method Details

#finish ⇒ Object 



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# File 'lib/rack/bug/speedtracer/tracer.rb', line 202

def finish
  super()

  until @pstack.empty?
    finish_event
  end
  self
end

#finish_event ⇒ Object 



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# File 'lib/rack/bug/speedtracer/tracer.rb', line 153

def finish_event
  event = @pstack.pop
  if event.nil?
  else
    event.finish


    unless (parent = @pstack.last).nil?
      parent.children.push event
    else
      @children.push event
    end
  end
end

#hash_representation ⇒ Object 



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# File 'lib/rack/bug/speedtracer/tracer.rb', line 168

def hash_representation
  finish
  { 'trace' =>  {

    'url' => "/speedtracer?id=#@id",

    'frameStack' => {

      'range' => range(@start, @finish),
      'operation' =>  {
      'type' =>  'HTTP',
      'label' =>  [@method, @uri].join(' ')
    },
      'children' =>  @children

    }, #end frameStack

      'resources' => {
      'Application' => '/', #Should get the Rails app name...
      'Application.endpoint' => '/' #Should get the env path thing
    }, #From what I can tell, Speed Tracer treats this whole hash as optional

      'range' =>  range(@start, @finish)
  }
  }
end

#make_string_of(array) ⇒ Object 



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# File 'lib/rack/bug/speedtracer/tracer.rb', line 139

def make_string_of(array)
  array.map do |item|
    short_string(item)
  end.join(",")
end

#run(context = "::", called_at = , args = [], &blk) ⇒ Object

TODO: Threadsafe



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# File 'lib/rack/bug/speedtracer/tracer.rb', line 98

def run(context="::", called_at = caller[0], args=[], &blk)
  file, line, method = called_at.split(':')

  method = method.gsub(/^in|[^\w]+/, '') if method

  start_event(file, line, method, context, args)
  blk.call      # execute the provided code block
  finish_event
end

#short_string(item, max_per_elem = 50) ⇒ Object 



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# File 'lib/rack/bug/speedtracer/tracer.rb', line 108

def short_string(item, max_per_elem = 50)
  begin
    string = item.inspect
    if string.length > max_per_elem
      case item
      when NilClass
        "nil"
      when Hash
        "{ " + item.map do |key, value|
          short_string(key, 15) + "=>" + short_string(value, 30)
        end.join(", ") + " }"
      when find_constant("ActionView::Base")
        tmpl = item.template
        if tmpl.nil?
          item.path.inspect
        else
          [tmpl.base_path, tmpl.name].join("/")
        end
      when find_constant("ActiveRecord::Base")
        string = "#{item.class.name}(#{item.id})" 
      else
        string = item.class.name
      end
    else
      string
    end
  rescue Exception => ex
    "..."
  end
end

#start_event(file, line, method, context, arguments) ⇒ Object 



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# File 'lib/rack/bug/speedtracer/tracer.rb', line 145

def start_event(file, line, method, context, arguments)
  @event_id += 1

  arguments_string = make_string_of(arguments)
  event = ServerEvent.new(@event_id, file, line, method, context, arguments_string)
  @pstack.push event
end

#to_html ⇒ Object 



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# File 'lib/rack/bug/speedtracer/tracer.rb', line 195

def to_html
  hash = hash_representation
  extra = {:self_time => duration - time_in_children}
  "<a href='#{hash['url']}'>Raw JSON</a>\n" + 
    render_template('serverevent', extra.merge(symbolize_hash(hash['trace']['frameStack'])))
end