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require 'ruby-prof'
module Rack
# Set the profile=process_time query parameter to download a
# calltree profile of the request.
#
# Pass the :printer option to pick a different result format.
#
# You can cause every request to be run multiple times by passing the
# `:times` option to the `use Rack::Profiler` call. You can also run a
# given request multiple times, by setting the `profiler_runs` query
# parameter in the request URL.
#
class Profiler
MODES = %w(process_time wall_time cpu_time
allocations memory gc_runs gc_time)
DEFAULT_PRINTER = :call_stack
CONTENT_TYPES = Hash.new('application/octet-stream').merge(
'RubyProf::FlatPrinter' => 'text/plain',
'RubyProf::GraphPrinter' => 'text/plain',
'RubyProf::GraphHtmlPrinter' => 'text/html',
'RubyProf::CallStackPrinter' => 'text/html')
# Accepts a :printer => [:call_stack|:call_tree|:graph_html|:graph|:flat]
# option defaulting to :call_stack.
def initialize(app, options = {})
@app = app
@printer = parse_printer(options[:printer] || DEFAULT_PRINTER)
@times = (options[:times] || 1).to_i
end
def call(env)
if mode = profiling?(env)
profile(env, mode)
else
@app.call(env)
end
end
private
def profiling?(env)
unless ::RubyProf.running?
request = Rack::Request.new(env.clone)
if mode = request.params.delete('profile')
if ::RubyProf.const_defined?(mode.upcase)
mode
else
env['rack.errors'].write "Invalid RubyProf measure_mode: " +
"#{mode}. Use one of #{MODES.to_a.join(', ')}"
false
end
end
end
end
def profile(env, mode)
::RubyProf.measure_mode = ::RubyProf.const_get(mode.upcase)
GC.enable_stats if GC.respond_to?(:enable_stats)
request = Rack::Request.new(env.clone)
runs = (request.params['profiler_runs'] || @times).to_i
result = ::RubyProf.profile do
runs.times { @app.call(env) }
end
GC.disable_stats if GC.respond_to?(:disable_stats)
[200, headers(@printer, env, mode), print(@printer, result)]
end
def print(printer, result)
body = StringIO.new
printer.new(result).print(body, :min_percent => 0.01)
body.rewind
body
end
def headers(printer, env, mode)
headers = { 'Content-Type' => CONTENT_TYPES[printer.name] }
if printer == ::RubyProf::CallTreePrinter
filename = ::File.basename(env['PATH_INFO'])
headers['Content-Disposition'] =
%(attachment; filename="#{filename}.#{mode}.tree")
end
headers
end
def parse_printer(printer)
if printer.is_a?(Class)
printer
else
name = "#{camel_case(printer)}Printer"
if ::RubyProf.const_defined?(name)
::RubyProf.const_get(name)
else
::RubyProf::FlatPrinter
end
end
end
def camel_case(word)
word.to_s.gsub(/(?:^|_)(.)/) { $1.upcase }
end
end
end
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