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# frozen_string_literal: true
require "cases/helper"
require "support/connection_helper"
module ActiveRecord
class Mysql2TransactionTest < ActiveRecord::Mysql2TestCase
self.use_transactional_tests = false
class Sample < ActiveRecord::Base
self.table_name = "samples"
end
setup do
@abort, Thread.abort_on_exception = Thread.abort_on_exception, false
@connection = ActiveRecord::Base.connection
@connection.clear_cache!
@connection.transaction do
@connection.drop_table "samples", if_exists: true
@connection.create_table("samples") do |t|
t.integer "value"
end
end
Sample.reset_column_information
end
teardown do
@connection.drop_table "samples", if_exists: true
Thread.abort_on_exception = @abort
end
test "raises Deadlocked when a deadlock is encountered" do
assert_raises(ActiveRecord::Deadlocked) do
barrier = Concurrent::CyclicBarrier.new(2)
s1 = Sample.create value: 1
s2 = Sample.create value: 2
thread = Thread.new do
Sample.transaction do
s1.lock!
barrier.wait
s2.update_attributes value: 1
end
end
begin
Sample.transaction do
s2.lock!
barrier.wait
s1.update_attributes value: 2
end
ensure
thread.join
end
end
end
test "raises TransactionTimeout when lock wait timeout exceeded" do
assert_raises(ActiveRecord::TransactionTimeout) do
s = Sample.create!(value: 1)
latch1 = Concurrent::CountDownLatch.new
latch2 = Concurrent::CountDownLatch.new
thread = Thread.new do
Sample.transaction do
Sample.lock.find(s.id)
latch1.count_down
latch2.wait
end
end
begin
Sample.transaction do
latch1.wait
Sample.connection.execute("SET innodb_lock_wait_timeout = 1")
Sample.lock.find(s.id)
end
ensure
Sample.connection.execute("SET innodb_lock_wait_timeout = DEFAULT")
latch2.count_down
thread.join
end
end
end
end
end
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