aboutsummaryrefslogtreecommitdiffstats
path: root/activerecord/test/cases/query_cache_test.rb
blob: d635a47c0ecc721f1c1ac2d9cc0928962332563e (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
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
# frozen_string_literal: true

require "cases/helper"
require "models/topic"
require "models/task"
require "models/category"
require "models/post"
require "rack"

class QueryCacheTest < ActiveRecord::TestCase
  self.use_transactional_tests = false

  fixtures :tasks, :topics, :categories, :posts, :categories_posts

  class ShouldNotHaveExceptionsLogger < ActiveRecord::LogSubscriber
    attr_reader :logger

    def initialize
      super
      @logger = ::Logger.new File::NULL
      @exception = false
    end

    def exception?
      @exception
    end

    def sql(event)
      super
    rescue
      @exception = true
    end
  end

  def teardown
    Task.connection.clear_query_cache
    ActiveRecord::Base.connection.disable_query_cache!
    super
  end

  def test_exceptional_middleware_clears_and_disables_cache_on_error
    assert_cache :off

    mw = middleware { |env|
      Task.find 1
      Task.find 1
      query_cache = ActiveRecord::Base.connection.query_cache
      assert_equal 1, query_cache.length, query_cache.keys
      raise "lol borked"
    }
    assert_raises(RuntimeError) { mw.call({}) }

    assert_cache :off
  end

  private def with_temporary_connection_pool
    old_pool = ActiveRecord::Base.connection_handler.retrieve_connection_pool(ActiveRecord::Base.connection_specification_name)
    new_pool = ActiveRecord::ConnectionAdapters::ConnectionPool.new ActiveRecord::Base.connection_pool.spec
    ActiveRecord::Base.connection_handler.send(:owner_to_pool)["primary"] = new_pool

    yield
  ensure
    ActiveRecord::Base.connection_handler.send(:owner_to_pool)["primary"] = old_pool
  end

  def test_query_cache_across_threads
    with_temporary_connection_pool do
      begin
        if in_memory_db?
          # Separate connections to an in-memory database create an entirely new database,
          # with an empty schema etc, so we just stub out this schema on the fly.
          ActiveRecord::Base.connection_pool.with_connection do |connection|
            connection.create_table :tasks do |t|
              t.datetime :starting
              t.datetime :ending
            end
          end
          ActiveRecord::FixtureSet.create_fixtures(self.class.fixture_path, ["tasks"], {}, ActiveRecord::Base)
        end

        ActiveRecord::Base.connection_pool.connections.each do |conn|
          assert_cache :off, conn
        end

        assert_not_predicate ActiveRecord::Base.connection, :nil?
        assert_cache :off

        middleware {
          assert_cache :clean

          Task.find 1
          assert_cache :dirty

          thread_1_connection = ActiveRecord::Base.connection
          ActiveRecord::Base.clear_active_connections!
          assert_cache :off, thread_1_connection

          started = Concurrent::Event.new
          checked = Concurrent::Event.new

          thread_2_connection = nil
          thread = Thread.new {
            thread_2_connection = ActiveRecord::Base.connection

            assert_equal thread_2_connection, thread_1_connection
            assert_cache :off

            middleware {
              assert_cache :clean

              Task.find 1
              assert_cache :dirty

              started.set
              checked.wait

              ActiveRecord::Base.clear_active_connections!
            }.call({})
          }

          started.wait

          thread_1_connection = ActiveRecord::Base.connection
          assert_not_equal thread_1_connection, thread_2_connection
          assert_cache :dirty, thread_2_connection
          checked.set
          thread.join

          assert_cache :off, thread_2_connection
        }.call({})

        ActiveRecord::Base.connection_pool.connections.each do |conn|
          assert_cache :off, conn
        end
      ensure
        ActiveRecord::Base.connection_pool.disconnect!
      end
    end
  end

  def test_middleware_delegates
    called = false
    mw = middleware { |env|
      called = true
      [200, {}, nil]
    }
    mw.call({})
    assert called, "middleware should delegate"
  end

  def test_middleware_caches
    mw = middleware { |env|
      Task.find 1
      Task.find 1
      query_cache = ActiveRecord::Base.connection.query_cache
      assert_equal 1, query_cache.length, query_cache.keys
      [200, {}, nil]
    }
    mw.call({})
  end

  def test_cache_enabled_during_call
    assert_cache :off

    mw = middleware { |env|
      assert_cache :clean
      [200, {}, nil]
    }
    mw.call({})
  end

  def test_cache_passing_a_relation
    post = Post.first
    Post.cache do
      query = post.categories.select(:post_id)
      assert Post.connection.select_all(query).is_a?(ActiveRecord::Result)
    end
  end

  def test_find_queries
    assert_queries(2) { Task.find(1); Task.find(1) }
  end

  def test_find_queries_with_cache
    Task.cache do
      assert_queries(1) { Task.find(1); Task.find(1) }
    end
  end

  def test_find_queries_with_cache_multi_record
    Task.cache do
      assert_queries(2) { Task.find(1); Task.find(1); Task.find(2) }
    end
  end

  def test_find_queries_with_multi_cache_blocks
    Task.cache do
      Task.cache do
        assert_queries(2) { Task.find(1); Task.find(2) }
      end
      assert_queries(0) { Task.find(1); Task.find(1); Task.find(2) }
    end
  end

  def test_count_queries_with_cache
    Task.cache do
      assert_queries(1) { Task.count; Task.count }
    end
  end

  def test_exists_queries_with_cache
    Post.cache do
      assert_queries(1) { Post.exists?; Post.exists? }
    end
  end

  def test_select_all_with_cache
    Post.cache do
      assert_queries(1) do
        2.times { Post.connection.select_all(Post.all) }
      end
    end
  end

  def test_select_one_with_cache
    Post.cache do
      assert_queries(1) do
        2.times { Post.connection.select_one(Post.all) }
      end
    end
  end

  def test_select_value_with_cache
    Post.cache do
      assert_queries(1) do
        2.times { Post.connection.select_value(Post.all) }
      end
    end
  end

  def test_select_values_with_cache
    Post.cache do
      assert_queries(1) do
        2.times { Post.connection.select_values(Post.all) }
      end
    end
  end

  def test_select_rows_with_cache
    Post.cache do
      assert_queries(1) do
        2.times { Post.connection.select_rows(Post.all) }
      end
    end
  end

  def test_query_cache_dups_results_correctly
    Task.cache do
      now  = Time.now.utc
      task = Task.find 1
      assert_not_equal now, task.starting
      task.starting = now
      task.reload
      assert_not_equal now, task.starting
    end
  end

  def test_cache_does_not_raise_exceptions
    logger = ShouldNotHaveExceptionsLogger.new
    subscriber = ActiveSupport::Notifications.subscribe "sql.active_record", logger

    ActiveRecord::Base.cache do
      assert_queries(1) { Task.find(1); Task.find(1) }
    end

    assert_not_predicate logger, :exception?
  ensure
    ActiveSupport::Notifications.unsubscribe subscriber
  end

  def test_query_cache_does_not_allow_sql_key_mutation
    subscriber = ActiveSupport::Notifications.subscribe("sql.active_record") do |_, _, _, _, payload|
      payload[:sql].downcase!
    end

    assert_raises frozen_error_class do
      ActiveRecord::Base.cache do
        assert_queries(1) { Task.find(1); Task.find(1) }
      end
    end
  ensure
    ActiveSupport::Notifications.unsubscribe subscriber
  end

  def test_cache_is_flat
    Task.cache do
      assert_queries(1) { Topic.find(1); Topic.find(1); }
    end

    ActiveRecord::Base.cache do
      assert_queries(1) { Task.find(1); Task.find(1) }
    end
  end

  def test_cache_does_not_wrap_results_in_arrays
    Task.cache do
      if current_adapter?(:SQLite3Adapter, :Mysql2Adapter, :PostgreSQLAdapter, :OracleAdapter)
        assert_equal 2, Task.connection.select_value("SELECT count(*) AS count_all FROM tasks")
      else
        assert_instance_of String, Task.connection.select_value("SELECT count(*) AS count_all FROM tasks")
      end
    end
  end

  def test_cache_is_ignored_for_locked_relations
    task = Task.find 1

    Task.cache do
      assert_queries(2) { task.lock!; task.lock! }
    end
  end

  def test_cache_is_available_when_connection_is_connected
    conf = ActiveRecord::Base.configurations

    ActiveRecord::Base.configurations = {}
    Task.cache do
      assert_queries(1) { Task.find(1); Task.find(1) }
    end
  ensure
    ActiveRecord::Base.configurations = conf
  end

  def test_cache_is_available_when_using_a_not_connected_connection
    skip "In-Memory DB can't test for using a not connected connection" if in_memory_db?
    with_temporary_connection_pool do
      spec_name = Task.connection_specification_name
      conf = ActiveRecord::Base.configurations["arunit"].merge("name" => "test2")
      ActiveRecord::Base.connection_handler.establish_connection(conf)
      Task.connection_specification_name = "test2"
      assert_not_predicate Task, :connected?

      Task.cache do
        begin
          assert_queries(1) { Task.find(1); Task.find(1) }
        ensure
          ActiveRecord::Base.connection_handler.remove_connection(Task.connection_specification_name)
          Task.connection_specification_name = spec_name
        end
      end
    end
  end

  def test_query_cache_executes_new_queries_within_block
    ActiveRecord::Base.connection.enable_query_cache!

    # Warm up the cache by running the query
    assert_queries(1) do
      assert_equal 0, Post.where(title: "test").to_a.count
    end

    # Check that if the same query is run again, no queries are executed
    assert_queries(0) do
      assert_equal 0, Post.where(title: "test").to_a.count
    end

    ActiveRecord::Base.connection.uncached do
      # Check that new query is executed, avoiding the cache
      assert_queries(1) do
        assert_equal 0, Post.where(title: "test").to_a.count
      end
    end
  end

  def test_query_cache_doesnt_leak_cached_results_of_rolled_back_queries
    ActiveRecord::Base.connection.enable_query_cache!
    post = Post.first

    Post.transaction do
      post.update(title: "rollback")
      assert_equal 1, Post.where(title: "rollback").to_a.count
      raise ActiveRecord::Rollback
    end

    assert_equal 0, Post.where(title: "rollback").to_a.count

    ActiveRecord::Base.connection.uncached do
      assert_equal 0, Post.where(title: "rollback").to_a.count
    end

    begin
      Post.transaction do
        post.update(title: "rollback")
        assert_equal 1, Post.where(title: "rollback").to_a.count
        raise "broken"
      end
    rescue Exception
    end

    assert_equal 0, Post.where(title: "rollback").to_a.count

    ActiveRecord::Base.connection.uncached do
      assert_equal 0, Post.where(title: "rollback").to_a.count
    end
  end

  def test_query_cached_even_when_types_are_reset
    Task.cache do
      # Warm the cache
      Task.find(1)

      # Preload the type cache again (so we don't have those queries issued during our assertions)
      Task.connection.send(:reload_type_map)

      # Clear places where type information is cached
      Task.reset_column_information
      Task.initialize_find_by_cache

      assert_queries(0) do
        Task.find(1)
      end
    end
  end

  def test_query_cache_does_not_establish_connection_if_unconnected
    with_temporary_connection_pool do
      ActiveRecord::Base.clear_active_connections!
      assert_not ActiveRecord::Base.connection_handler.active_connections? # sanity check

      middleware {
        assert_not ActiveRecord::Base.connection_handler.active_connections?, "QueryCache forced ActiveRecord::Base to establish a connection in setup"
      }.call({})

      assert_not ActiveRecord::Base.connection_handler.active_connections?, "QueryCache forced ActiveRecord::Base to establish a connection in cleanup"
    end
  end

  def test_query_cache_is_enabled_on_connections_established_after_middleware_runs
    with_temporary_connection_pool do
      ActiveRecord::Base.clear_active_connections!
      assert_not ActiveRecord::Base.connection_handler.active_connections? # sanity check

      middleware {
        assert ActiveRecord::Base.connection.query_cache_enabled, "QueryCache did not get lazily enabled"
      }.call({})
    end
  end

  def test_query_caching_is_local_to_the_current_thread
    with_temporary_connection_pool do
      ActiveRecord::Base.clear_active_connections!

      middleware {
        assert ActiveRecord::Base.connection_pool.query_cache_enabled
        assert ActiveRecord::Base.connection.query_cache_enabled

        Thread.new {
          assert_not ActiveRecord::Base.connection_pool.query_cache_enabled
          assert_not ActiveRecord::Base.connection.query_cache_enabled
        }.join
      }.call({})

    end
  end

  def test_query_cache_is_enabled_on_all_connection_pools
    middleware {
      ActiveRecord::Base.connection_handler.connection_pool_list.each do |pool|
        assert pool.query_cache_enabled
        assert pool.connection.query_cache_enabled
      end
    }.call({})
  end

  private
    def middleware(&app)
      executor = Class.new(ActiveSupport::Executor)
      ActiveRecord::QueryCache.install_executor_hooks executor
      lambda { |env| executor.wrap { app.call(env) } }
    end

    def assert_cache(state, connection = ActiveRecord::Base.connection)
      case state
      when :off
        assert !connection.query_cache_enabled, "cache should be off"
        assert connection.query_cache.empty?, "cache should be empty"
      when :clean
        assert connection.query_cache_enabled, "cache should be on"
        assert connection.query_cache.empty?, "cache should be empty"
      when :dirty
        assert connection.query_cache_enabled, "cache should be on"
        assert !connection.query_cache.empty?, "cache should be dirty"
      else
        raise "unknown state"
      end
    end
end

class QueryCacheExpiryTest < ActiveRecord::TestCase
  fixtures :tasks, :posts, :categories, :categories_posts

  def teardown
    Task.connection.clear_query_cache
  end

  def test_cache_gets_cleared_after_migration
    # warm the cache
    Post.find(1)

    # change the column definition
    Post.connection.change_column :posts, :title, :string, limit: 80
    assert_nothing_raised { Post.find(1) }

    # restore the old definition
    Post.connection.change_column :posts, :title, :string
  end

  def test_find
    assert_called(Task.connection, :clear_query_cache) do
      assert !Task.connection.query_cache_enabled
      Task.cache do
        assert Task.connection.query_cache_enabled
        Task.find(1)

        Task.uncached do
          assert !Task.connection.query_cache_enabled
          Task.find(1)
        end

        assert Task.connection.query_cache_enabled
      end
      assert !Task.connection.query_cache_enabled
    end
  end

  def test_update
    assert_called(Task.connection, :clear_query_cache, times: 2) do
      Task.cache do
        task = Task.find(1)
        task.starting = Time.now.utc
        task.save!
      end
    end
  end

  def test_destroy
    assert_called(Task.connection, :clear_query_cache, times: 2) do
      Task.cache do
        Task.find(1).destroy
      end
    end
  end

  def test_insert
    assert_called(ActiveRecord::Base.connection, :clear_query_cache, times: 2) do
      Task.cache do
        Task.create!
      end
    end
  end

  def test_cache_is_expired_by_habtm_update
    assert_called(ActiveRecord::Base.connection, :clear_query_cache, times: 2) do
      ActiveRecord::Base.cache do
        c = Category.first
        p = Post.first
        p.categories << c
      end
    end
  end

  def test_cache_is_expired_by_habtm_delete
    assert_called(ActiveRecord::Base.connection, :clear_query_cache, times: 2) do
      ActiveRecord::Base.cache do
        p = Post.find(1)
        assert_predicate p.categories, :any?
        p.categories.delete_all
      end
    end
  end

  test "threads use the same connection" do
    @connection_1 = ActiveRecord::Base.connection.object_id

    thread_a = Thread.new do
      @connection_2 = ActiveRecord::Base.connection.object_id
    end

    thread_a.join

    assert_equal @connection_1, @connection_2
  end
end