Class: Scrap::Middleware

Inherits:
Object
  • Object
show all
Defined in:
lib/scrap.rb

Constant Summary collapse

COMMIFY_REGEX = 
/(\d)(?=(\d\d\d)+(?!\d))/
CRLF = 
"\r\n"
@@gc_stats = 
{}
@@last_gc_run = 
nil
@@last_gc_mem = 
nil
@@requests_processed = 
0
@@request_list = 
[]
@@alive_at = 
nil
@@gc_stats_enabled = 
nil
@@config = 
nil

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(app) ⇒ Middleware

Returns a new instance of Middleware.



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# File 'lib/scrap.rb', line 8

def initialize(app)
  @@app = app
end

Class Method Details

.add_os(c, s, options = {}) ⇒ Object 



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# File 'lib/scrap.rb', line 146

def self.add_os(c, s, options = {})
  print_objects = options["print_objects"]
  small = options["small"]
  min = options["min"]
  show_fields = options["show_fields"]
  
  ct = ObjectSpace.each_object(c) {}
  return if min and ct < min
  
  if small
    s << "#{c} (#{ct})<br />"
  else
    s << "<h3>#{c} (#{ct})</h3>"
  end
  
  return if !print_objects or ct == 0
  s << CRLF
  s << '<table>'
  val = ObjectSpace.each_object(c) do |m|
    s << '<tr><td class="t">' << "&lt;#{m.class.to_s}:#{sprintf("0x%.8x", m.object_id)}&gt;</td>"
    if show_fields then
      show_fields.each do |field|
        v = m.attributes[field.to_s]
        if v.blank?
          s << '<td>&nbsp;</td>'
        else
          s << "<td>#{field}: #{v}</td>"
        end
      end 
    end
    s << '</tr>'
  end
  s << '</table>' << CRLF
end

.call(env) ⇒ Object 



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# File 'lib/scrap.rb', line 34

def self.call(env)
  if !@@gc_stats_enabled
    GC.enable_stats if GC.respond_to? :enable_stats # for REE
    GC::Profiler.enable if defined? GC::Profiler # for 1.9.3+
    @@gc_stats_enabled = true
  end
  @@requests_processed += 1
  @@last_gc_run ||= @@alive_at ||= Time.now.to_f
  @@last_gc_mem ||= get_usage

  req = sprintf("<p>vsize:[%-10.2fMB] rss:[%-10.2fMB] %s %s</p>", get_usage[:virtual], get_usage[:real], env["REQUEST_METHOD"], env["PATH_INFO"])
  req << "<pre>#{ObjectSpace.statistics}</pre>" if ObjectSpace.respond_to? :statistics
  req << "<pre>#{readable_gc_stat}</pre>" if GC.respond_to? :stat
  @@request_list.unshift req    
  @@request_list.pop if @@request_list.length > (config["max_requests"] || 150)

  if env["PATH_INFO"] == "/stats/scrap"
    gc_stats
  else
    @@app.call(env) 
  end
end

.commify(i) ⇒ Object 



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# File 'lib/scrap.rb', line 210

def self.commify(i)
  i.to_s.gsub(COMMIFY_REGEX, "\\1,")
end

.config ⇒ Object 



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# File 'lib/scrap.rb', line 25

def self.config
  @@config ||= YAML::load open(File.join(Rails.root, "config", "scrap.yml")).read
rescue Errno::ENOENT
  @@config = {}
rescue
  puts "[scrap] scrap.yml: #{$!.message}"
  @@config = {}
end

.gc_stats ⇒ Object 



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# File 'lib/scrap.rb', line 57

def self.gc_stats   
  collected = nil
  puts "Respond to? #{ObjectSpace.respond_to? :live_objects}"
  if ObjectSpace.respond_to? :live_objects
    live = ObjectSpace.live_objects
    GC.start
    collected = live - ObjectSpace.live_objects
  else
    GC.start
  end
  usage = get_usage
  
  virtual_mem_delta = usage[:virtual] - @@last_gc_mem[:virtual]
  real_mem_delta = usage[:real] - @@last_gc_mem[:real]
  time_delta = Time.now.to_f - @@last_gc_run    
  s = ''
  s << '<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"' << CRLF
  s << '   "http://www.w3.org/TR/html4/strict.dtd">' << CRLF
  s << '<html><head>' << CRLF
  s << "<title>[#{$$}] Garbage Report</title>" << CRLF
  s << '<style type="text/css"> body { font-family: monospace; color: #222; } td { border-bottom: 1px solid #eee; padding: 1px 9px; } td.t { background: #fafafa; } tr:hover td { background: #fafaf0; border-color: #e0e0dd; } h1,h2,h3 { border-bottom: 1px solid #ddd; font-family: sans-serif; } </style>' << CRLF
  s << '<body>' << CRLF
  
  s << "<h1>Scrap - PID #{$$}</h1>" << CRLF
  
  s << '<table>' << CRLF
  s << sprintf('<tr><td class="t">Virtual Memory usage:</td><td>%2.2fMB</td></tr>', usage[:virtual])
  s << sprintf('<tr><td class="t">Real Memory usage:</td><td>%2.2fMB</td></tr>', usage[:real])
  s << sprintf('<tr><td class="t">Vsize Delta:</td><td>%2.2fMB</td></tr>', virtual_mem_delta)
  s << sprintf('<tr><td class="t">RSS Delta:</td><td>%2.2fMB</td></tr>', real_mem_delta)
  s << sprintf('<tr><td class="t">Last Scrap req:</td><td>%2.2f seconds ago</td></tr>', time_delta)
  s << sprintf('<tr><td class="t">Requests processed:</td><td>%s</td></tr>', @@requests_processed)
  s << sprintf('<tr><td class="t">Alive for:</td><td>%2.2f seconds</td></tr>', Time.now.to_f - @@alive_at)
  if GC.respond_to? :time
    s << sprintf('<tr><td class="t">Total time spent in GC:</td><td>%2.2f seconds</td></tr>', GC.time / 1000000.0)
  elsif defined? GC::Profiler
    s << sprintf('<tr><td class="t">Total time spent in GC:</td><td>%2.2f seconds</td></tr>', GC::Profiler.total_time / 1000.0)
  end
  if collected
    s << sprintf('<tr><td class="t">Collected objects:</td><td>%2d</td></tr>', collected)
    s << sprintf('<tr><td class="t">Live objects:</td><td>%2d</td></tr>', ObjectSpace.live_objects)
  end 
  s << '</table>' << CRLF

  s << "<h3>Top #{config["max_objects"]} deltas since last request</h3>"
  s << '<table border="0">'
  memcheck(config["max_objects"], Object, :deltas).each do |v|
    next if v.last == 0
    s << "<tr><td class='t'>#{v.first}</td><td>#{sprintf("%s%s", v.last >= 0 ? "+" : "-", commify(v.last))}</td></tr>"
  end
  s << '</table>'

  s << "<h3>Top #{config["max_objects"]} objects</h3>"
  s << '<table border="0">'
  memcheck(config["max_objects"]).each do |v|
    s << "<tr><td class='t'>#{v.first}</td><td>#{commify v.last}</td></tr>"
  end
  s << '</table>'
  
  (config["classes"] || {}).each do |klass, val|
    puts val.inspect
    opts = val === true ? {"print_objects" => true} : val
    add_os(klass.constantize, s, opts)
  end
  
  s << '<h3>Request history</h3>'
  @@request_list.each do |req|
    s << req
  end
  s << '</body></html>'
  
  @@last_gc_run = Time.now.to_f
  @@last_gc_mem = usage
  @@requests_processed = 0
  [200, {"Content-Type" => "text/html"}, [s]]
end

.get_usage ⇒ Object 



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# File 'lib/scrap.rb', line 134

def self.get_usage
  usage = Hash.new("N/A")
  begin
    stat = `cat /proc/#{$$}/stat`.split(" ")
    usage[:virtual] = stat[22].to_i / (1024 * 1024).to_f
    usage[:real] = stat[23].to_i * (`getconf PAGESIZE`.to_f) / (1024 * 1024).to_f
  rescue
    # pass
  end
  return usage
end

.memcheck(top, klass = Object, mode = :normal) ⇒ Object 



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# File 'lib/scrap.rb', line 181

def self.memcheck(top, klass = Object, mode = :normal)
  top ||= 50
  os = Hash.new(0)
  ObjectSpace.each_object(klass) do |o|
    begin;
      # If this is true, it's an association proxy, and we don't want to invoke method_missing on it,
      # as it will result in a load of the association proxy from the DB, doing extra DB work and
      # potentially creating a lot of AR objects. Hackalicious.
      next if o.respond_to? :proxy_respond_to?        
      os[o.class.to_s] += 1 if o.respond_to? :class
    rescue; end
  end
  if mode == :deltas then
    os2 = Hash.new(0)
    os.each do |k, v|
      os2[k] = v - (@@gc_stats[k] || 0)
      @@gc_stats[k] = v
    end
    sorted = os2.sort_by{|k,v| -v }.first(top)
  else
    sorted = os.sort_by{|k,v| -v }.first(top)
  end
end

.readable_gc_stat ⇒ Object 



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# File 'lib/scrap.rb', line 205

def self.readable_gc_stat
  stat = GC.stat
  "GC cycles so far: #{stat[:count]}\nNumber of heaps : #{stat[:heap_used]}\nNumber of objects : #{ObjectSpace.count_objects[:TOTAL]}\nHeap length     : #{stat[:heap_length]}\nHeap increment  : #{stat[:heap_increment]}\nHeap live num   : #{stat[:heap_live_num]}\nHeap free num   : #{stat[:heap_free_num]}\nHeap final num  : #{stat[:heap_final_num]}\n"
end

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/scrap.rb', line 12

def call(env)
  self.class.call(env)
end