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Notifications: extract central Notifier, cordon off the internal Fanout implementation, and segregate instrumentation concerns
This commit is contained in:
Jeremy Kemper
parent
02893d1705
commit
4f2a04cc08
6 changed files with 292 additions and 339 deletions
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@ -632,13 +632,15 @@ class FragmentCachingTest < ActionController::TestCase
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def test_fragment_for_logging
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fragment_computed = false
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ActiveSupport::Notifications.queue.expects(:publish).times(2)
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events = []
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ActiveSupport::Notifications.subscribe { |*args| events << args }
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buffer = 'generated till now -> '
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@controller.fragment_for(buffer, 'expensive') { fragment_computed = true }
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assert fragment_computed
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assert_equal 'generated till now -> ', buffer
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assert_equal [:fragment_exist?, :write_fragment], events.map(&:first)
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end
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end
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@ -1,7 +1,4 @@
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require 'thread'
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require 'active_support/core_ext/module/delegation'
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require 'active_support/core_ext/module/attribute_accessors'
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require 'active_support/secure_random'
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module ActiveSupport
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# Notifications provides an instrumentation API for Ruby. To instrument an
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@ -41,155 +38,42 @@ module ActiveSupport
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# to subscribers in a thread. You can use any queue implementation you want.
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#
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module Notifications
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mattr_accessor :queue
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autoload :Instrumenter, 'active_support/notifications/instrumenter'
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autoload :Event, 'active_support/notifications/instrumenter'
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autoload :Fanout, 'active_support/notifications/fanout'
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class << self
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delegate :instrument, :transaction_id, :transaction, :to => :instrumenter
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attr_writer :notifier
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delegate :publish, :subscribe, :instrument, :to => :notifier
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def instrumenter
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Thread.current[:notifications_instrumeter] ||= Instrumenter.new(publisher)
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end
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def publisher
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@publisher ||= Publisher.new(queue)
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end
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def subscribe(pattern=nil, &block)
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Subscriber.new(queue).bind(pattern).subscribe(&block)
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def notifier
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@notifier ||= Notifier.new
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end
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end
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class Instrumenter
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def initialize(publisher)
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@publisher = publisher
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@id = random_id
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end
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def transaction
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@id, old_id = random_id, @id
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yield
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ensure
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@id = old_id
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end
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def transaction_id
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@id
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end
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def instrument(name, payload={})
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time = Time.now
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result = yield if block_given?
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ensure
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@publisher.publish(name, time, Time.now, result, @id, payload)
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end
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private
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def random_id
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SecureRandom.hex(10)
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end
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end
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class Publisher
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def initialize(queue)
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class Notifier
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def initialize(queue = Fanout.new)
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@queue = queue
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end
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def publish(*args)
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@queue.publish(*args)
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end
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end
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class Subscriber
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def initialize(queue)
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@queue = queue
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end
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def bind(pattern)
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@pattern = pattern
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self
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end
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def subscribe
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@queue.subscribe(@pattern) do |*args|
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yield(*args)
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end
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end
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end
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class Event
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attr_reader :name, :time, :end, :transaction_id, :result, :payload
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def initialize(name, start, ending, result, transaction_id, payload)
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@name = name
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@payload = payload.dup
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@time = start
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@transaction_id = transaction_id
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@end = ending
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@result = result
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end
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def duration
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@duration ||= 1000.0 * (@end - @time)
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end
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def parent_of?(event)
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start = (self.time - event.time) * 1000
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start <= 0 && (start + duration >= event.duration)
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end
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end
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# This is a default queue implementation that ships with Notifications. It
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# consumes events in a thread and publish them to all registered subscribers.
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#
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class LittleFanout
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def initialize
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@listeners = []
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end
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def publish(*args)
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@listeners.each { |l| l.publish(*args) }
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end
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def subscribe(pattern=nil, &block)
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@listeners << Listener.new(pattern, &block)
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def subscribe(pattern = nil, &block)
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@queue.bind(pattern).subscribe(&block)
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end
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def wait
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sleep 0.05 until drained?
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@queue.wait
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end
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delegate :instrument, :to => :current_instrumenter
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private
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def drained?
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@listeners.all? &:drained?
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def current_instrumenter
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Thread.current[:"instrumentation_#{object_id}"] ||= Notifications::Instrumenter.new(self)
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end
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# Used for internal implementation only.
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class Listener #:nodoc:
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def initialize(pattern, &block)
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@pattern = pattern
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@subscriber = block
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@queue = Queue.new
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Thread.new { consume }
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end
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def publish(name, *args)
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if !@pattern || @pattern === name.to_s
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@queue << args.unshift(name)
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end
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end
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def consume
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while args = @queue.shift
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@subscriber.call(*args)
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end
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end
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def drained?
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@queue.size.zero?
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end
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end
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end
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end
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Notifications.queue = Notifications::LittleFanout.new
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end
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84
activesupport/lib/active_support/notifications/fanout.rb
Normal file
84
activesupport/lib/active_support/notifications/fanout.rb
Normal file
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@ -0,0 +1,84 @@
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require 'thread'
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module ActiveSupport
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module Notifications
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# This is a default queue implementation that ships with Notifications. It
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# consumes events in a thread and publish them to all registered subscribers.
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#
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class Fanout
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def initialize
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@subscribers = []
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end
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def bind(pattern)
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Binding.new(self, pattern)
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end
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def subscribe(pattern = nil, &block)
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@subscribers << Subscriber.new(pattern, &block)
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end
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def publish(*args)
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@subscribers.each { |s| s.publish(*args) }
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end
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def wait
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sleep(0.05) until @subscribers.all?(&:drained?)
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end
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# Used for internal implementation only.
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class Binding #:nodoc:
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def initialize(queue, pattern)
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@queue, @pattern = queue, pattern
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end
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def subscribe(&block)
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@queue.subscribe(@pattern, &block)
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end
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end
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# Used for internal implementation only.
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class Subscriber #:nodoc:
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def initialize(pattern, &block)
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@pattern =
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case pattern
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when Regexp, NilClass
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pattern
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else
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/^#{Regexp.escape(pattern.to_s)}/
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end
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@block = block
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@events = Queue.new
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start_consumer
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end
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def publish(name, *args)
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push(name, args) if matches?(name)
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end
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def consume
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while args = @events.shift
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@block.call(*args)
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end
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end
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def drained?
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@events.size.zero?
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end
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private
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def start_consumer
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Thread.new { consume }
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end
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def matches?(name)
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!@pattern || @pattern =~ name.to_s
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end
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def push(name, args)
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@events << args.unshift(name)
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end
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end
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end
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end
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end
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@ -0,0 +1,47 @@
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require 'active_support/secure_random'
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require 'active_support/core_ext/module/delegation'
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module ActiveSupport
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module Notifications
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class Instrumenter
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def initialize(notifier)
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@id = unique_id
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@notifier = notifier
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end
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def instrument(name, payload={})
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time = Time.now
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result = yield if block_given?
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ensure
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@notifier.publish(name, time, Time.now, result, @id, payload)
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end
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private
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def unique_id
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SecureRandom.hex(10)
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end
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end
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class Event
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attr_reader :name, :time, :end, :transaction_id, :result, :payload
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def initialize(name, start, ending, result, transaction_id, payload)
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@name = name
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@payload = payload.dup
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@time = start
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@transaction_id = transaction_id
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@end = ending
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@result = result
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end
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def duration
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@duration ||= 1000.0 * (@end - @time)
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end
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def parent_of?(event)
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start = (self.time - event.time) * 1000
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start <= 0 && (start + duration >= event.duration)
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end
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end
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end
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end
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@ -1,206 +1,160 @@
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require 'abstract_unit'
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# Allow LittleFanout to be cleaned.
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class ActiveSupport::Notifications::LittleFanout
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def clear
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@listeners.clear
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end
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end
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module Notifications
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class TestCase < ActiveSupport::TestCase
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def setup
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Thread.abort_on_exception = true
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class NotificationsEventTest < Test::Unit::TestCase
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def test_events_are_initialized_with_details
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event = event(:foo, Time.now, Time.now + 1, 1, random_id, :payload => :bar)
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assert_equal :foo, event.name
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assert_equal Hash[:payload => :bar], event.payload
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end
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def test_events_consumes_information_given_as_payload
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time = Time.now
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event = event(:foo, time, time + 0.01, 1, random_id, {})
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assert_equal Hash.new, event.payload
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assert_equal time, event.time
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assert_equal 1, event.result
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assert_equal 10.0, event.duration
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end
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def test_event_is_parent_based_on_time_frame
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time = Time.utc(2009, 01, 01, 0, 0, 1)
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parent = event(:foo, Time.utc(2009), Time.utc(2009) + 100, nil, random_id, {})
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child = event(:foo, time, time + 10, nil, random_id, {})
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not_child = event(:foo, time, time + 100, nil, random_id, {})
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assert parent.parent_of?(child)
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assert !child.parent_of?(parent)
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assert !parent.parent_of?(not_child)
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assert !not_child.parent_of?(parent)
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end
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protected
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def random_id
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@random_id ||= ActiveSupport::SecureRandom.hex(10)
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end
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def event(*args)
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ActiveSupport::Notifications::Event.new(*args)
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end
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end
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class NotificationsMainTest < Test::Unit::TestCase
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def setup
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@events = []
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Thread.abort_on_exception = true
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ActiveSupport::Notifications.subscribe do |*args|
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@events << ActiveSupport::Notifications::Event.new(*args)
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end
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end
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def teardown
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Thread.abort_on_exception = false
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ActiveSupport::Notifications.queue.clear
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end
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def test_notifications_returns_action_result
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result = ActiveSupport::Notifications.instrument(:awesome, :payload => "notifications") do
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1 + 1
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@notifier = ActiveSupport::Notifications::Notifier.new
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@events = []
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@notifier.subscribe { |*args| @events << event(*args) }
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end
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assert_equal 2, result
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end
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def test_events_are_published_to_a_listener
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ActiveSupport::Notifications.instrument(:awesome, :payload => "notifications") do
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1 + 1
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def teardown
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Thread.abort_on_exception = false
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end
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drain
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private
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def event(*args)
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ActiveSupport::Notifications::Event.new(*args)
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end
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assert_equal 1, @events.size
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assert_equal :awesome, @events.last.name
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assert_equal Hash[:payload => "notifications"], @events.last.payload
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def drain
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@notifier.wait
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end
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end
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def test_nested_events_can_be_instrumented
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ActiveSupport::Notifications.instrument(:awesome, :payload => "notifications") do
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ActiveSupport::Notifications.instrument(:wot, :payload => "child") do
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1 + 1
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class PubSubTest < TestCase
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def test_events_are_published_to_a_listener
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@notifier.publish :foo
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@notifier.wait
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assert_equal [[:foo]], @events
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end
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def test_subscriber_with_pattern
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events = []
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@notifier.subscribe('1') { |*args| events << args }
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@notifier.publish '1'
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@notifier.publish '1.a'
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@notifier.publish 'a.1'
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@notifier.wait
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assert_equal [['1'], ['1.a']], events
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end
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def test_subscriber_with_pattern_as_regexp
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events = []
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@notifier.subscribe(/\d/) { |*args| events << args }
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@notifier.publish '1'
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@notifier.publish 'a.1'
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@notifier.publish '1.a'
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@notifier.wait
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assert_equal [['1'], ['a.1'], ['1.a']], events
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end
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def test_multiple_subscribers
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@another = []
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@notifier.subscribe { |*args| @another << args }
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@notifier.publish :foo
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@notifier.wait
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assert_equal [[:foo]], @events
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assert_equal [[:foo]], @another
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end
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private
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def event(*args)
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args
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end
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end
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class InstrumentationTest < TestCase
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def test_instrument_returns_block_result
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assert_equal 2, @notifier.instrument(:awesome) { 1 + 1 }
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end
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def test_nested_events_can_be_instrumented
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@notifier.instrument(:awesome, :payload => "notifications") do
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@notifier.instrument(:wot, :payload => "child") do
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1 + 1
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end
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drain
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assert_equal 1, @events.size
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assert_equal :wot, @events.first.name
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assert_equal Hash[:payload => "child"], @events.first.payload
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end
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drain
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assert_equal 2, @events.size
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assert_equal :awesome, @events.last.name
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assert_equal Hash[:payload => "notifications"], @events.last.payload
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end
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def test_instrument_publishes_when_exception_is_raised
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begin
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@notifier.instrument(:awesome, :payload => "notifications") do
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raise "OMG"
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end
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flunk
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rescue
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end
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drain
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assert_equal 1, @events.size
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assert_equal :wot, @events.first.name
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assert_equal Hash[:payload => "child"], @events.first.payload
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assert_equal :awesome, @events.last.name
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assert_equal Hash[:payload => "notifications"], @events.last.payload
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end
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drain
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def test_event_is_pushed_even_without_block
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@notifier.instrument(:awesome, :payload => "notifications")
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drain
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assert_equal 2, @events.size
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assert_equal :awesome, @events.last.name
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assert_equal Hash[:payload => "notifications"], @events.last.payload
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assert_equal 1, @events.size
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assert_equal :awesome, @events.last.name
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assert_equal Hash[:payload => "notifications"], @events.last.payload
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end
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end
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def test_event_is_pushed_even_if_block_fails
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ActiveSupport::Notifications.instrument(:awesome, :payload => "notifications") do
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raise "OMG"
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end rescue RuntimeError
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class EventTest < TestCase
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def test_events_are_initialized_with_details
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event = event(:foo, Time.now, Time.now + 1, 1, random_id, :payload => :bar)
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assert_equal :foo, event.name
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assert_equal Hash[:payload => :bar], event.payload
|
||||
end
|
||||
|
||||
drain
|
||||
def test_events_consumes_information_given_as_payload
|
||||
time = Time.now
|
||||
event = event(:foo, time, time + 0.01, 1, random_id, {})
|
||||
|
||||
assert_equal 1, @events.size
|
||||
assert_equal :awesome, @events.last.name
|
||||
assert_equal Hash[:payload => "notifications"], @events.last.payload
|
||||
assert_equal Hash.new, event.payload
|
||||
assert_equal time, event.time
|
||||
assert_equal 1, event.result
|
||||
assert_equal 10.0, event.duration
|
||||
end
|
||||
|
||||
def test_event_is_parent_based_on_time_frame
|
||||
time = Time.utc(2009, 01, 01, 0, 0, 1)
|
||||
|
||||
parent = event(:foo, Time.utc(2009), Time.utc(2009) + 100, nil, random_id, {})
|
||||
child = event(:foo, time, time + 10, nil, random_id, {})
|
||||
not_child = event(:foo, time, time + 100, nil, random_id, {})
|
||||
|
||||
assert parent.parent_of?(child)
|
||||
assert !child.parent_of?(parent)
|
||||
assert !parent.parent_of?(not_child)
|
||||
assert !not_child.parent_of?(parent)
|
||||
end
|
||||
|
||||
protected
|
||||
def random_id
|
||||
@random_id ||= ActiveSupport::SecureRandom.hex(10)
|
||||
end
|
||||
end
|
||||
|
||||
def test_event_is_pushed_even_without_block
|
||||
ActiveSupport::Notifications.instrument(:awesome, :payload => "notifications")
|
||||
drain
|
||||
|
||||
assert_equal 1, @events.size
|
||||
assert_equal :awesome, @events.last.name
|
||||
assert_equal Hash[:payload => "notifications"], @events.last.payload
|
||||
end
|
||||
|
||||
def test_subscribed_in_a_transaction
|
||||
@another = []
|
||||
|
||||
ActiveSupport::Notifications.subscribe("cache") do |*args|
|
||||
@another << ActiveSupport::Notifications::Event.new(*args)
|
||||
end
|
||||
|
||||
ActiveSupport::Notifications.instrument(:cache){ 1 }
|
||||
ActiveSupport::Notifications.transaction do
|
||||
ActiveSupport::Notifications.instrument(:cache){ 1 }
|
||||
end
|
||||
ActiveSupport::Notifications.instrument(:cache){ 1 }
|
||||
|
||||
drain
|
||||
|
||||
assert_equal 3, @another.size
|
||||
before, during, after = @another.map {|e| e.transaction_id }
|
||||
assert_equal before, after
|
||||
assert_not_equal before, during
|
||||
end
|
||||
|
||||
def test_subscriber_with_pattern
|
||||
@another = []
|
||||
|
||||
ActiveSupport::Notifications.subscribe("cache") do |*args|
|
||||
@another << ActiveSupport::Notifications::Event.new(*args)
|
||||
end
|
||||
|
||||
ActiveSupport::Notifications.instrument(:cache){ 1 }
|
||||
|
||||
drain
|
||||
|
||||
assert_equal 1, @another.size
|
||||
assert_equal :cache, @another.first.name
|
||||
assert_equal 1, @another.first.result
|
||||
end
|
||||
|
||||
def test_subscriber_with_pattern_as_regexp
|
||||
@another = []
|
||||
ActiveSupport::Notifications.subscribe(/cache/) do |*args|
|
||||
@another << ActiveSupport::Notifications::Event.new(*args)
|
||||
end
|
||||
|
||||
ActiveSupport::Notifications.instrument(:something){ 0 }
|
||||
ActiveSupport::Notifications.instrument(:cache){ 1 }
|
||||
|
||||
drain
|
||||
|
||||
assert_equal 1, @another.size
|
||||
assert_equal :cache, @another.first.name
|
||||
assert_equal 1, @another.first.result
|
||||
end
|
||||
|
||||
def test_with_several_consumers_and_several_events
|
||||
@another = []
|
||||
ActiveSupport::Notifications.subscribe do |*args|
|
||||
@another << ActiveSupport::Notifications::Event.new(*args)
|
||||
end
|
||||
|
||||
1.upto(100) do |i|
|
||||
ActiveSupport::Notifications.instrument(:value){ i }
|
||||
end
|
||||
|
||||
drain
|
||||
|
||||
assert_equal 100, @events.size
|
||||
assert_equal :value, @events.first.name
|
||||
assert_equal 1, @events.first.result
|
||||
assert_equal 100, @events.last.result
|
||||
|
||||
assert_equal 100, @another.size
|
||||
assert_equal :value, @another.first.name
|
||||
assert_equal 1, @another.first.result
|
||||
assert_equal 100, @another.last.result
|
||||
end
|
||||
|
||||
private
|
||||
def drain
|
||||
ActiveSupport::Notifications.queue.wait
|
||||
end
|
||||
end
|
||||
|
|
|
|||
|
|
@ -5,21 +5,8 @@ module ApplicationTests
|
|||
include ActiveSupport::Testing::Isolation
|
||||
|
||||
class MyQueue
|
||||
attr_reader :events, :subscribers
|
||||
|
||||
def initialize
|
||||
@events = []
|
||||
@subscribers = []
|
||||
@listeners = []
|
||||
end
|
||||
|
||||
def publish(name, *args)
|
||||
@events << name
|
||||
end
|
||||
|
||||
def subscribe(listener, pattern=nil, &block)
|
||||
@listeners << listener
|
||||
@subscribers << pattern
|
||||
raise name
|
||||
end
|
||||
end
|
||||
|
||||
|
|
@ -28,21 +15,16 @@ module ApplicationTests
|
|||
boot_rails
|
||||
require "rails"
|
||||
require "active_support/notifications"
|
||||
@events = []
|
||||
Rails::Initializer.run do |c|
|
||||
c.notifications.queue = MyQueue.new
|
||||
c.notifications.subscribe(/listening/) do
|
||||
puts "Cool"
|
||||
end
|
||||
c.notifications.notifier = ActiveSupport::Notifications::Notifier.new(MyQueue.new)
|
||||
end
|
||||
end
|
||||
|
||||
test "new queue is set" do
|
||||
ActiveSupport::Notifications.instrument(:foo)
|
||||
assert_equal :foo, ActiveSupport::Notifications.queue.events.first
|
||||
end
|
||||
|
||||
test "configuration subscribers are loaded" do
|
||||
assert_equal 1, ActiveSupport::Notifications.queue.subscribers.count { |s| s == /listening/ }
|
||||
assert_raise RuntimeError do
|
||||
ActiveSupport::Notifications.publish('foo')
|
||||
end
|
||||
end
|
||||
end
|
||||
end
|
||||
|
|
|
|||
Loading…
Reference in a new issue