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test middleware for Ruby 2.0 logging the method dispatches going on when a request is being handled.
class TracePoint
class Middleware
def initialize(app)
@app = app
end
def call(env)
stats = {}
trace = TracePoint.new(:call) do |tp|
stats[tp.defined_class] ||= {}
stats[tp.defined_class][tp.method_id] ||= 0
stats[tp.defined_class][tp.method_id] += 1
end
trace.enable
response = @app.call(env)
trace.disable
puts env['PATH_INFO']
puts "#{stats.keys.size} classes used"
puts "#{stats.map{|k,v| v.keys}.flatten.size} methods used"
puts "#{stats.map{|k,v| v.values}.flatten.sum} methods dispatched"
#File.open("tmp/#{env['PATH_INFO'].gsub('/', '_')}_req_stats.json", "w"){|f| f << stats.to_json }
puts ""
response
end
end
end
@mattetti

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@mattetti mattetti commented Mar 6, 2013

to use in Rails, add the following to the application.rb file:

config.middleware.insert_before(ActionDispatch::Static, TracePoint::Middleware)
@chucai

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@chucai chucai commented Dec 20, 2013

I got the following error from my Rails application when I use this code.

ERROR ArgumentError: wrong number of arguments (1 for 5)
    /Users/xdhe/Documents/FreeWheel/rpm/ui/payment/lib/tracepoint_middleware.rb:12:in `initialize'

Can you give me some help? Thanks

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