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# frozen_string_literal: true
require 'test_helper'
class LockTest < GemTestCase
setup do
@lock_name = 'test lock'
@return_val = 1900
end
test 'returns nil outside an advisory lock request' do
assert_nil(Tag.current_advisory_lock)
end
test 'returns the name of the last lock acquired' do
Tag.with_advisory_lock(@lock_name) do
assert_match(/#{@lock_name}/, Tag.current_advisory_lock)
end
end
test 'can obtain a lock with a name that attempts to disrupt a SQL comment' do
dangerous_lock_name = 'test */ lock /*'
Tag.with_advisory_lock(dangerous_lock_name) do
assert_match(/#{Regexp.escape(dangerous_lock_name)}/, Tag.current_advisory_lock)
end
end
test 'returns false for an unacquired lock' do
refute(Tag.advisory_lock_exists?(@lock_name))
end
test 'returns true for an acquired lock' do
Tag.with_advisory_lock(@lock_name) do
assert(Tag.advisory_lock_exists?(@lock_name))
end
end
test 'returns block return value if lock successful' do
assert_equal(@return_val, Tag.with_advisory_lock!(@lock_name) { @return_val })
end
test 'returns false on lock acquisition failure' do
thread_with_lock = Thread.new do
Tag.with_advisory_lock(@lock_name, timeout_seconds: 0) do
@locked_elsewhere = true
loop { sleep 0.01 }
end
end
sleep 0.01 until @locked_elsewhere
assert_not(Tag.with_advisory_lock(@lock_name, timeout_seconds: 0) { @return_val })
thread_with_lock.kill
end
test 'raises an error on lock acquisition failure' do
thread_with_lock = Thread.new do
Tag.with_advisory_lock(@lock_name, timeout_seconds: 0) do
@locked_elsewhere = true
loop { sleep 0.01 }
end
end
sleep 0.01 until @locked_elsewhere
assert_raises(WithAdvisoryLock::FailedToAcquireLock) do
Tag.with_advisory_lock!(@lock_name, timeout_seconds: 0) { @return_val }
end
thread_with_lock.kill
end
test 'attempts the lock exactly once with no timeout' do
expected = SecureRandom.base64
actual = Tag.with_advisory_lock(@lock_name, 0) do
expected
end
assert_equal(expected, actual)
end
test 'current_advisory_locks returns empty array outside an advisory lock request' do
assert_equal([], Tag.current_advisory_locks)
end
test 'current_advisory_locks returns an array with names of the acquired locks' do
Tag.with_advisory_lock(@lock_name) do
locks = Tag.current_advisory_locks
assert_equal(1, locks.size)
assert_match(/#{@lock_name}/, locks.first)
end
end
test 'current_advisory_locks returns array of all nested lock names' do
first_lock = 'outer lock'
second_lock = 'inner lock'
Tag.with_advisory_lock(first_lock) do
Tag.with_advisory_lock(second_lock) do
locks = Tag.current_advisory_locks
assert_equal(2, locks.size)
assert_match(/#{first_lock}/, locks.first)
assert_match(/#{second_lock}/, locks.last)
end
locks = Tag.current_advisory_locks
assert_equal(1, locks.size)
assert_match(/#{first_lock}/, locks.first)
end
assert_equal([], Tag.current_advisory_locks)
end
end
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