aboutsummaryrefslogtreecommitdiffstats
path: root/activesupport/test/notifications_test.rb
blob: 3b98749f1b86242cf17a039eacf2fa147627cb90 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
# frozen_string_literal: true

require "abstract_unit"
require "active_support/core_ext/module/delegation"

module Notifications
  class TestCase < ActiveSupport::TestCase
    def setup
      @old_notifier = ActiveSupport::Notifications.notifier
      @notifier = ActiveSupport::Notifications::Fanout.new
      ActiveSupport::Notifications.notifier = @notifier
      @events = []
      @named_events = []
      @subscription = @notifier.subscribe { |*args| @events << event(*args) }
      @named_subscription = @notifier.subscribe("named.subscription") { |*args| @named_events << event(*args) }
    end

    def teardown
      ActiveSupport::Notifications.notifier = @old_notifier
    end

  private

    def event(*args)
      ActiveSupport::Notifications::Event.new(*args)
    end
  end

  class SubscribeEventObjectsTest < TestCase
    def test_subscribe_events
      events = []
      @notifier.subscribe do |event|
        events << event
      end

      ActiveSupport::Notifications.instrument("foo")
      event = events.first
      assert event, "should have an event"
      assert_operator event.allocations, :>, 0
      assert_operator event.cpu_time, :>, 0
      assert_operator event.idle_time, :>, 0
      assert_operator event.duration, :>, 0
    end

    def test_subscribe_via_top_level_api
      old_notifier = ActiveSupport::Notifications.notifier
      ActiveSupport::Notifications.notifier = ActiveSupport::Notifications::Fanout.new

      event = nil
      ActiveSupport::Notifications.subscribe("foo") do |e|
        event = e
      end

      ActiveSupport::Notifications.instrument("foo") do
        100.times { Object.new } # allocate at least 100 objects
      end

      assert event
      assert_operator event.allocations, :>=, 100
    ensure
      ActiveSupport::Notifications.notifier = old_notifier
    end
  end

  class TimedAndMonotonicTimedSubscriberTest < TestCase
    def test_subscribe
      event_name = "foo"
      class_of_started = nil
      class_of_finished = nil

      ActiveSupport::Notifications.subscribe(event_name) do |name, started, finished, unique_id, data|
        class_of_started = started.class
        class_of_finished = finished.class
      end

      ActiveSupport::Notifications.instrument(event_name)

      assert_equal [Time, Time], [class_of_started, class_of_finished]
    end

    def test_monotonic_subscribe
      event_name = "foo"
      class_of_started = nil
      class_of_finished = nil

      ActiveSupport::Notifications.monotonic_subscribe(event_name) do |name, started, finished, unique_id, data|
        class_of_started = started.class
        class_of_finished = finished.class
      end

      ActiveSupport::Notifications.instrument(event_name)

      assert_equal [Float, Float], [class_of_started, class_of_finished]
    end
  end

  class SubscribedTest < TestCase
    def test_subscribed
      name     = "foo"
      name2    = name * 2
      expected = [name, name]

      events   = []
      callback = lambda { |*_| events << _.first }
      ActiveSupport::Notifications.subscribed(callback, name) do
        ActiveSupport::Notifications.instrument(name)
        ActiveSupport::Notifications.instrument(name2)
        ActiveSupport::Notifications.instrument(name)
      end
      assert_equal expected, events

      ActiveSupport::Notifications.instrument(name)
      assert_equal expected, events
    end

    def test_subscribing_to_instrumentation_while_inside_it
      # the repro requires that there are no evented subscribers for the "foo" event,
      # so we have to duplicate some of the setup code
      old_notifier = ActiveSupport::Notifications.notifier
      ActiveSupport::Notifications.notifier = ActiveSupport::Notifications::Fanout.new

      ActiveSupport::Notifications.subscribe("foo", TestSubscriber.new)

      ActiveSupport::Notifications.instrument("foo") do
        ActiveSupport::Notifications.subscribe("foo") { }
      end
    ensure
      ActiveSupport::Notifications.notifier = old_notifier
    end

    def test_timed_subscribed
      event_name = "foo"
      class_of_started = nil
      class_of_finished = nil
      callback = lambda do |name, started, finished, unique_id, data|
        class_of_started = started.class
        class_of_finished = finished.class
      end

      ActiveSupport::Notifications.subscribed(callback, event_name) do
        ActiveSupport::Notifications.instrument(event_name)
      end

      ActiveSupport::Notifications.instrument(event_name)

      assert_equal [Time, Time], [class_of_started, class_of_finished]
    end

    def test_monotonic_timed_subscribed
      event_name = "foo"
      class_of_started = nil
      class_of_finished = nil
      callback = lambda do |name, started, finished, unique_id, data|
        class_of_started = started.class
        class_of_finished = finished.class
      end

      ActiveSupport::Notifications.subscribed(callback, event_name, monotonic: true) do
        ActiveSupport::Notifications.instrument(event_name)
      end

      ActiveSupport::Notifications.instrument(event_name)

      assert_equal [Float, Float], [class_of_started, class_of_finished]
    end
  end

  class UnsubscribeTest < TestCase
    def test_unsubscribing_removes_a_subscription
      @notifier.publish :foo
      @notifier.wait
      assert_equal [[:foo]], @events
      @notifier.unsubscribe(@subscription)
      @notifier.publish :foo
      @notifier.wait
      assert_equal [[:foo]], @events
    end

    def test_unsubscribing_by_name_removes_a_subscription
      @notifier.publish "named.subscription", :foo
      @notifier.wait
      assert_equal [["named.subscription", :foo]], @named_events
      @notifier.unsubscribe("named.subscription")
      @notifier.publish "named.subscription", :foo
      @notifier.wait
      assert_equal [["named.subscription", :foo]], @named_events
    end

    def test_unsubscribing_by_name_leaves_the_other_subscriptions
      @notifier.publish "named.subscription", :foo
      @notifier.wait
      assert_equal [["named.subscription", :foo]], @events
      @notifier.unsubscribe("named.subscription")
      @notifier.publish "named.subscription", :foo
      @notifier.wait
      assert_equal [["named.subscription", :foo], ["named.subscription", :foo]], @events
    end

    def test_unsubscribing_by_name_leaves_regexp_matched_subscriptions
      @matched_events = []
      @notifier.subscribe(/subscription/) { |*args| @matched_events << event(*args) }
      @notifier.publish("named.subscription", :before)
      @notifier.wait
      [@events, @named_events, @matched_events].each do |collector|
        assert_includes(collector, ["named.subscription", :before])
      end
      @notifier.unsubscribe("named.subscription")
      @notifier.publish("named.subscription", :after)
      @notifier.publish("other.subscription", :after)
      @notifier.wait
      assert_includes(@events, ["named.subscription", :after])
      assert_includes(@events, ["other.subscription", :after])
      assert_includes(@matched_events, ["other.subscription", :after])
      assert_not_includes(@matched_events, ["named.subscription", :after])
      assert_not_includes(@named_events, ["named.subscription", :after])
    end

  private
    def event(*args)
      args
    end
  end

  class TestSubscriber
    attr_reader :starts, :finishes, :publishes

    def initialize
      @starts    = []
      @finishes  = []
      @publishes = []
    end

    def start(*args);  @starts << args; end
    def finish(*args); @finishes << args; end
    def publish(*args); @publishes << args; end
  end

  class SyncPubSubTest < TestCase
    def test_events_are_published_to_a_listener
      @notifier.publish :foo
      @notifier.wait
      assert_equal [[:foo]], @events
    end

    def test_publishing_multiple_times_works
      @notifier.publish :foo
      @notifier.publish :foo
      @notifier.wait
      assert_equal [[:foo], [:foo]], @events
    end

    def test_publishing_after_a_new_subscribe_works
      @notifier.publish :foo
      @notifier.publish :foo

      @notifier.subscribe("not_existent") do |*args|
        @events << ActiveSupport::Notifications::Event.new(*args)
      end

      @notifier.publish :foo
      @notifier.publish :foo
      @notifier.wait

      assert_equal [[:foo]] * 4, @events
    end

    def test_log_subscriber_with_string
      events = []
      @notifier.subscribe("1") { |*args| events << args }

      @notifier.publish "1"
      @notifier.publish "1.a"
      @notifier.publish "a.1"
      @notifier.wait

      assert_equal [["1"]], events
    end

    def test_log_subscriber_with_pattern
      events = []
      @notifier.subscribe(/\d/) { |*args| events << args }

      @notifier.publish "1"
      @notifier.publish "a.1"
      @notifier.publish "1.a"
      @notifier.wait

      assert_equal [["1"], ["a.1"], ["1.a"]], events
    end

    def test_multiple_log_subscribers
      @another = []
      @notifier.subscribe { |*args| @another << args }
      @notifier.publish :foo
      @notifier.wait

      assert_equal [[:foo]], @events
      assert_equal [[:foo]], @another
    end

    def test_publish_with_subscriber
      subscriber = TestSubscriber.new
      @notifier.subscribe nil, subscriber
      @notifier.publish :foo

      assert_equal [[:foo]], subscriber.publishes
    end

    private
      def event(*args)
        args
      end
  end

  class InstrumentationTest < TestCase
    delegate :instrument, to: ActiveSupport::Notifications

    def test_instrument_returns_block_result
      assert_equal 2, instrument(:awesome) { 1 + 1 }
    end

    def test_instrument_yields_the_payload_for_further_modification
      assert_equal 2, instrument(:awesome) { |p| p[:result] = 1 + 1 }
      assert_equal 1, @events.size
      assert_equal :awesome, @events.first.name
      assert_equal Hash[result: 2], @events.first.payload
    end

    def test_instrumenter_exposes_its_id
      assert_equal 20, ActiveSupport::Notifications.instrumenter.id.size
    end

    def test_nested_events_can_be_instrumented
      instrument(:awesome, payload: "notifications") do
        instrument(:wot, payload: "child") do
          1 + 1
        end

        assert_equal 1, @events.size
        assert_equal :wot, @events.first.name
        assert_equal Hash[payload: "child"], @events.first.payload
      end

      assert_equal 2, @events.size
      assert_equal :awesome, @events.last.name
      assert_equal Hash[payload: "notifications"], @events.last.payload
    end

    def test_instrument_publishes_when_exception_is_raised
      begin
        instrument(:awesome, payload: "notifications") do
          raise "FAIL"
        end
      rescue RuntimeError => e
        assert_equal "FAIL", e.message
      end

      assert_equal 1, @events.size
      assert_equal Hash[payload: "notifications",
        exception: ["RuntimeError", "FAIL"], exception_object: e], @events.last.payload
    end

    def test_event_is_pushed_even_without_block
      instrument(:awesome, payload: "notifications")
      assert_equal 1, @events.size
      assert_equal :awesome, @events.last.name
      assert_equal Hash[payload: "notifications"], @events.last.payload
    end
  end

  class EventTest < TestCase
    def test_events_are_initialized_with_details
      time = Time.now
      event = event(:foo, time, time + 0.01, random_id, {})

      assert_equal :foo, event.name
      assert_equal time, event.time
      assert_in_delta 10.0, event.duration, 0.00001
    end

    def test_event_cpu_time_does_not_raise_error_when_start_or_finished_not_called
      time = Time.now
      event = event(:foo, time, time + 0.01, random_id, {})

      assert_equal 0, event.cpu_time
    end

    def test_events_consumes_information_given_as_payload
      event = event(:foo, Concurrent.monotonic_time, Concurrent.monotonic_time + 1, random_id, payload: :bar)
      assert_equal Hash[payload: :bar], event.payload
    end

    def test_event_is_parent_based_on_children
      time = Concurrent.monotonic_time

      parent    = event(:foo, Concurrent.monotonic_time, Concurrent.monotonic_time + 100, random_id, {})
      child     = event(:foo, time, time + 10, random_id, {})
      not_child = event(:foo, time, time + 100, random_id, {})

      parent.children << child

      assert parent.parent_of?(child)
      assert_not child.parent_of?(parent)
      assert_not parent.parent_of?(not_child)
      assert_not not_child.parent_of?(parent)
    end

    private
      def random_id
        @random_id ||= SecureRandom.hex(10)
      end
  end
end