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| 1 | +# frozen_string_literal: true |
| 2 | + |
| 3 | +require 'test_helper' |
| 4 | + |
| 5 | +# Universal blocking tests - work on all adapters |
| 6 | +module BlockingTestCases |
| 7 | + extend ActiveSupport::Concern |
| 8 | + |
| 9 | + included do |
| 10 | + setup do |
| 11 | + @lock_name = 'test_blocking_lock' |
| 12 | + end |
| 13 | + |
| 14 | + test 'blocking lock acquires lock successfully' do |
| 15 | + result = model_class.with_advisory_lock(@lock_name, blocking: true) do |
| 16 | + 'success' |
| 17 | + end |
| 18 | + assert_equal('success', result) |
| 19 | + end |
| 20 | + end |
| 21 | +end |
| 22 | + |
| 23 | +class PostgreSQLBlockingTest < GemTestCase |
| 24 | + include BlockingTestCases |
| 25 | + |
| 26 | + def model_class |
| 27 | + Tag |
| 28 | + end |
| 29 | + |
| 30 | + def setup |
| 31 | + super |
| 32 | + Tag.delete_all |
| 33 | + end |
| 34 | + |
| 35 | + test 'blocking lock waits for lock to be released' do |
| 36 | + lock_acquired = false |
| 37 | + thread1_finished = false |
| 38 | + |
| 39 | + thread1 = Thread.new do |
| 40 | + Tag.connection_pool.with_connection do |
| 41 | + Tag.transaction do |
| 42 | + Tag.with_advisory_lock(@lock_name, blocking: true, transaction: true) do |
| 43 | + lock_acquired = true |
| 44 | + sleep(0.5) |
| 45 | + thread1_finished = true |
| 46 | + end |
| 47 | + end |
| 48 | + end |
| 49 | + end |
| 50 | + |
| 51 | + sleep(0.1) until lock_acquired |
| 52 | + |
| 53 | + thread2_result = nil |
| 54 | + thread2 = Thread.new do |
| 55 | + Tag.connection_pool.with_connection do |
| 56 | + Tag.transaction do |
| 57 | + thread2_result = Tag.with_advisory_lock(@lock_name, blocking: true, transaction: true) do |
| 58 | + 'thread2_success' |
| 59 | + end |
| 60 | + end |
| 61 | + end |
| 62 | + end |
| 63 | + |
| 64 | + thread1.join |
| 65 | + thread2.join |
| 66 | + |
| 67 | + assert(thread1_finished, 'Thread 1 should have finished') |
| 68 | + assert_equal('thread2_success', thread2_result, 'Thread 2 should have acquired lock after thread 1 released it') |
| 69 | + end |
| 70 | + |
| 71 | + test 'blocking lock can be used with shared locks' do |
| 72 | + thread1_result = nil |
| 73 | + thread2_result = nil |
| 74 | + |
| 75 | + thread1 = Thread.new do |
| 76 | + Tag.connection_pool.with_connection do |
| 77 | + Tag.transaction do |
| 78 | + thread1_result = Tag.with_advisory_lock(@lock_name, blocking: true, shared: true, transaction: true) do |
| 79 | + 'shared1' |
| 80 | + end |
| 81 | + end |
| 82 | + end |
| 83 | + end |
| 84 | + |
| 85 | + thread2 = Thread.new do |
| 86 | + Tag.connection_pool.with_connection do |
| 87 | + Tag.transaction do |
| 88 | + thread2_result = Tag.with_advisory_lock(@lock_name, blocking: true, shared: true, transaction: true) do |
| 89 | + 'shared2' |
| 90 | + end |
| 91 | + end |
| 92 | + end |
| 93 | + end |
| 94 | + |
| 95 | + thread1.join |
| 96 | + thread2.join |
| 97 | + |
| 98 | + assert_equal('shared1', thread1_result) |
| 99 | + assert_equal('shared2', thread2_result) |
| 100 | + end |
| 101 | +end |
| 102 | + |
| 103 | +class MySQLBlockingTest < GemTestCase |
| 104 | + include BlockingTestCases |
| 105 | + |
| 106 | + def model_class |
| 107 | + MysqlTag |
| 108 | + end |
| 109 | + |
| 110 | + def setup |
| 111 | + super |
| 112 | + MysqlTag.delete_all |
| 113 | + end |
| 114 | +end |
| 115 | + |
| 116 | +# Deadlock test requires non-transactional mode to work properly |
| 117 | +class PostgreSQLDeadlockTest < GemTestCase |
| 118 | + self.use_transactional_tests = false |
| 119 | + |
| 120 | + def setup |
| 121 | + super |
| 122 | + @lock_name = 'test_blocking_lock' |
| 123 | + Tag.delete_all |
| 124 | + end |
| 125 | + |
| 126 | + test 'blocking lock detects deadlocks and returns false' do |
| 127 | + deadlock_detected = false |
| 128 | + thread1_started = Concurrent::AtomicBoolean.new(false) |
| 129 | + thread2_started = Concurrent::AtomicBoolean.new(false) |
| 130 | + |
| 131 | + thread1 = Thread.new do |
| 132 | + Tag.connection_pool.with_connection do |
| 133 | + Tag.transaction do |
| 134 | + Tag.with_advisory_lock('lock_a', blocking: true, transaction: true) do |
| 135 | + thread1_started.make_true |
| 136 | + sleep(0.1) until thread2_started.true? |
| 137 | + |
| 138 | + result = Tag.with_advisory_lock('lock_b', blocking: true, transaction: true) do |
| 139 | + 'should_not_reach' |
| 140 | + end |
| 141 | + deadlock_detected = true if result == false |
| 142 | + end |
| 143 | + end |
| 144 | + rescue ActiveRecord::StatementInvalid => e |
| 145 | + deadlock_detected = true if e.message.downcase.include?('deadlock') |
| 146 | + end |
| 147 | + end |
| 148 | + |
| 149 | + thread2 = Thread.new do |
| 150 | + Tag.connection_pool.with_connection do |
| 151 | + Tag.transaction do |
| 152 | + Tag.with_advisory_lock('lock_b', blocking: true, transaction: true) do |
| 153 | + thread2_started.make_true |
| 154 | + sleep(0.1) until thread1_started.true? |
| 155 | + |
| 156 | + result = Tag.with_advisory_lock('lock_a', blocking: true, transaction: true) do |
| 157 | + 'should_not_reach' |
| 158 | + end |
| 159 | + deadlock_detected = true if result == false |
| 160 | + end |
| 161 | + end |
| 162 | + rescue ActiveRecord::StatementInvalid => e |
| 163 | + deadlock_detected = true if e.message.downcase.include?('deadlock') |
| 164 | + end |
| 165 | + end |
| 166 | + |
| 167 | + joined1 = thread1.join(10) |
| 168 | + joined2 = thread2.join(10) |
| 169 | + |
| 170 | + unless joined1 && joined2 |
| 171 | + thread1.kill if thread1.alive? |
| 172 | + thread2.kill if thread2.alive? |
| 173 | + flunk 'Deadlock detection timed out - threads did not complete within 10 seconds' |
| 174 | + end |
| 175 | + |
| 176 | + assert(deadlock_detected, 'Deadlock should have been detected by PostgreSQL') |
| 177 | + end |
| 178 | +end |
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