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Skip the :race_condition_ttl branch if the option is 0 or nil. This fixes an issue with the redis cache, where this code will sometimes throw an error out of SETEX when passing 0 as the expires_at.

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This commit is contained in:
Matt Wilde 2015-03-11 14:08:19 -07:00
parent 1b7ae86f26
commit 23767c0c41
2 changed files with 22 additions and 10 deletions
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4
activesupport/lib/active_support/cache.rb
View file

@ -566,8 +566,8 @@ module ActiveSupport
def handle_expired_entry(entry, key, options)
if entry && entry.expired?
race_ttl = options[:race_condition_ttl].to_i
if race_ttl && (Time.now.to_f - entry.expires_at <= race_ttl)
# When an entry has :race_condition_ttl defined, put the stale entry back into the cache
if (race_ttl > 0) && (Time.now.to_f - entry.expires_at <= race_ttl)
# When an entry has a positive :race_condition_ttl defined, put the stale entry back into the cache
# for a brief period while the entry is being recalculated.
entry.expires_at = Time.now + race_ttl
write_entry(key, entry, :expires_in => race_ttl * 2)

28
activesupport/test/caching_test.rb
View file

@ -399,15 +399,16 @@ module CacheStoreBehavior
assert_nil @cache.read('foo')
end
def test_race_condition_protection
time = Time.now
@cache.write('foo', 'bar', :expires_in => 60)
Time.stubs(:now).returns(time + 61)
result = @cache.fetch('foo', :race_condition_ttl => 10) do
assert_equal 'bar', @cache.read('foo')
"baz"
def test_race_condition_protection_skipped_if_not_defined
@cache.write('foo', 'bar')
time = @cache.send(:read_entry, 'foo', {}).expires_at
Time.stubs(:now).returns(Time.at(time))
result = @cache.fetch('foo') do
assert_equal nil, @cache.read('foo')
'baz'
end
assert_equal "baz", result
assert_equal 'baz', result
end
def test_race_condition_protection_is_limited
@ -437,6 +438,17 @@ module CacheStoreBehavior
assert_nil @cache.read('foo')
end
def test_race_condition_protection
time = Time.now
@cache.write('foo', 'bar', :expires_in => 60)
Time.stubs(:now).returns(time + 61)
result = @cache.fetch('foo', :race_condition_ttl => 10) do
assert_equal 'bar', @cache.read('foo')
"baz"
end
assert_equal "baz", result
end
def test_crazy_key_characters
crazy_key = "#/:*(<+=> )&$%@?;'\"\'`~-"
assert @cache.write(crazy_key, "1", :raw => true)