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