Class: ReReplay::Runner

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(input = nil) ⇒ Runner

Returns a new instance of Runner.



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# File 'lib/rereplay/ruby_runner.rb', line 14

def initialize(input=nil)
  if(!input.nil?)
    self.input = input
  end
  @periodic_monitors = []
  @request_monitors = []
end

Instance Attribute Details

#periodic_monitors ⇒ Object

Returns the value of attribute periodic_monitors.



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# File 'lib/rereplay/ruby_runner.rb', line 11

def periodic_monitors
  @periodic_monitors
end

#request_monitors ⇒ Object

Returns the value of attribute request_monitors.



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# File 'lib/rereplay/ruby_runner.rb', line 12

def request_monitors
  @request_monitors
end

Instance Method Details

#input=(input) ⇒ Object 



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# File 'lib/rereplay/ruby_runner.rb', line 22

def input=(input)
  if(input.is_a? Array)
    @input = input
  elsif(input.respond_to? :readlines)
    @input = input.readlines
  elsif(input.respond_to? :split)
    @input = input.split("\n").map do |i| 
      i = i.strip.split(",").map {|j| j.strip}
      i[0] = i[0].to_f
      i[1] = i[1].to_sym
      i
    end
  else
    raise "Invalid input, expected Array, #readlines, or #split"
  end
end

#prepare ⇒ Object 



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# File 'lib/rereplay/ruby_runner.rb', line 61

def prepare
  p = profile

  max_time = @input.max {|a, b| a[0] <=> b[0]}[0]
  
  loop_count = 1
  if(p[:when_input_consumed] == :loop)
    if(max_time < p[:run_for])
      loop_count = (p[:run_for].to_f / max_time).ceil
    end
  end
  if(loop_count > 1)
    new_inputs = []
    2.upto(loop_count) do |loop|
      new_input = @input.map do |i|
        new_i = i.dup
        new_i[0] += max_time * (loop - 1)
        new_i
      end
      new_inputs << new_input
    end
    new_inputs.each {|input| @input += input}
  end
  real_max_time = [max_time * loop_count, p[:run_for]].min
  if(p[:rampup][0] != p[:rampup][1] || p[:rampup][0] != 1.0)
    case p[:rampup_method]
    when :linear
      sr = 1.0 / p[:rampup][0]
      fr = 1.0 / p[:rampup][1]
      prev_time = 0
      new_prev_time = 0
      @input.map! do |a|
        time = a[0].to_f
        percent = time / real_max_time
        fraction = sr + (fr - sr)*(time / real_max_time)
        tmp = a[0]
        a[0] = (time - prev_time)*fraction + new_prev_time
        prev_time = tmp
        new_prev_time = a[0]
        a
      end
    end
  end
end

#profile ⇒ Object 



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# File 'lib/rereplay/ruby_runner.rb', line 243

def profile
  if(@profile.nil?)
    self.profile = {}
  end
  @profile
end

#profile=(new_profile) ⇒ Object 



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# File 'lib/rereplay/ruby_runner.rb', line 231

def profile=(new_profile)
  @profile = {
    :run_for => 5,
    :when_input_consumed => :stop,
    :timeout => 1,
    :rampup => [1.0, 1.0],
    :rampup_method => :linear
  }
  if(new_profile.is_a? Hash)
    @profile.merge!(new_profile)
  end
end

#run ⇒ Object 



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# File 'lib/rereplay/ruby_runner.rb', line 106

def run
  validate_input
  p = profile
  done_count = 0
  # request monitors with a start method
  request_monitors_start = request_monitors.select {|mon| mon.respond_to? :start}
  # request monitors with a finish method
  request_monitors_finish = request_monitors.select {|mon| mon.respond_to? :finish}
  tg = ThreadGroup.new
  q = Queue.new
  q.extend MonitorMixin
  waiters_cond = q.new_cond
  
  prepare
  start_time = nil
  index = 0
  requests_to_make = @input.map do |r| 
    a = r.dup
    a[3] = index
    index += 1
    a
  end
  thread_count = 20
  done = 0
  total_requests = @input.length
  max_delay = 0
  parent_thread = Thread.current
  Thread.abort_on_exception = true
  ready_for_processing = false
  gatekeeper = Thread.new do
    q.synchronize do
      waiters_cond.wait_until { ready_for_processing }
    end
    until requests_to_make.empty?
      task = requests_to_make.shift
      since_start = Time.new - start_time
      time_until_next_task = task[0] - since_start
    
      if(time_until_next_task > 0)
        sleep time_until_next_task
      end
      
      q << task
    end
  end
  
  thread_count.times do
    t = Thread.new do
      while true
        task = q.pop
        now = Time.new
        since_start = now - start_time
        delay = since_start - task[0]
        if(delay > max_delay) then max_delay = delay; end
        url = URI.parse(task[2])
        req = Net::HTTP::Get.new(url.path)
        request = OpenStruct.new(:url => task[2], :scheduled_start => task[0], :index => task[3], :http_method => task[1])
        # this connection can actually take ~300ms...is there a better way?
        Net::HTTP.start(url.host, url.port) do |http|
          http.read_timeout = p[:timeout]
          status = nil
          begin
            #request.actual_start = Time.now - start_time
            request.actual_start = now - start_time
            resp = http.request(req)
            request_monitors_start.each {|mon| mon.start(request)}
          rescue Timeout::Error
            status = :timeout
          end
          if status.nil?
            status = resp.code
          end
          time_finished = Time.now - start_time
          request.finish = time_finished
          request.status = status
          begin
            request_monitors_finish.each {|mon| mon.finish(request)}
          rescue => e
            parent_thread.raise e
          end
          q.synchronize do
            done += 1
            waiters_cond.broadcast
          end
        end
      end
    end
    tg.add t
  end
  test_duration_exceeded = false
  q.synchronize do
    ready_for_processing = true
    start_time = Time.now
    waiters_cond.broadcast
  end
  timeout_thread = Thread.new do
    sleep_duration = start_time + p[:run_for] - Time.now
    sleep sleep_duration
    q.synchronize do
      test_duration_exceeded = true
      waiters_cond.broadcast
    end
  end
  periodic_monitor_threads = []
  periodic_monitors.each do |mon|
    interval = mon.respond_to?(:interval) ? mon.interval : 5
    periodic_monitor_threads << Thread.new do
      i = 0
      while true
        mon.tick(Time.now - start_time)
        i += 1
        time_to_next = start_time + (interval * i) - Time.now
        sleep time_to_next if time_to_next > 0
      end
    end
  end
  q.synchronize do
    waiters_cond.wait_while { done < total_requests && !test_duration_exceeded }
  end
ensure
  gatekeeper.kill if gatekeeper
  tg.list.each {|t| t.kill} if tg
  periodic_monitor_threads.each {|t| t.kill} if periodic_monitor_threads
end

#validate_input ⇒ Object 



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# File 'lib/rereplay/ruby_runner.rb', line 39

def validate_input
  if(@input.nil? || @input.empty?)
    raise ArgumentError, "Nothing to process (input was empty)"
  end
  valid_methods = [:get, :head]
  @input.each_with_index do |a, i|
    if(!a[0].is_a? Numeric)
      raise ArgumentError, "Expected element at index 0 of input #{i+1} to be Numeric; was #{a[0]}"
    end
    if(!a[1].is_a?(Symbol) || !valid_methods.include?(a[1]))
      raise ArgumentError, "Expected element at index 1 of input #{i+1} to be a symbol in #{valid_methods.inspect}; was #{a[1].inspect}"
    end
    if(!a[2].is_a? String)
      raise ArgumentError, "Expected element at index 2 of input #{i+1} to be a String; was #{a[2]}"
    end
    if(!a[3].nil? && !a[3].is_a?(Hash))
      raise ArgumentError, "Expected element at index 3 of input #{i+1} to be nil or a Hash; was #{a[3]}"
    end
    # TODO post data
  end
end