// SetGlobalEnable is a convenience function for manipulating the GlobalConfig.
//
// It's meant to be called from admin handlers on your app to turn dscache
// functionality on or off in emergencies.
func SetGlobalEnable(c context.Context, memcacheEnabled bool) error {
// always go to the default namespace
c, err := info.Get(c).Namespace("")
if err != nil {
return err
}
return datastore.Get(c).RunInTransaction(func(c context.Context) error {
ds := datastore.Get(c)
cfg := &GlobalConfig{Enable: true}
if err := ds.Get(cfg); err != nil && err != datastore.ErrNoSuchEntity {
return err
}
if cfg.Enable == memcacheEnabled {
return nil
}
cfg.Enable = memcacheEnabled
if memcacheEnabled {
// when going false -> true, wipe memcache.
if err := memcache.Get(c).Flush(); err != nil {
return err
}
}
return ds.Put(cfg)
}, nil)
}
// AlwaysFilterRDS installs a caching RawDatastore filter in the context.
//
// Unlike FilterRDS it doesn't check GlobalConfig via IsGloballyEnabled call,
// assuming caller already knows whether filter should be applied or not.
func AlwaysFilterRDS(c context.Context, shardsForKey func(*ds.Key) int) context.Context {
return ds.AddRawFilters(c, func(c context.Context, ds ds.RawInterface) ds.RawInterface {
i := info.Get(c)
sc := &supportContext{
i.AppID(),
i.GetNamespace(),
c,
mc.Get(c),
mathrand.Get(c),
shardsForKey,
}
v := c.Value(dsTxnCacheKey)
if v == nil {
return &dsCache{ds, sc}
}
return &dsTxnCache{ds, v.(*dsTxnState), sc}
})
}
func TestCount(t *testing.T) {
t.Parallel()
Convey("Test Count filter", t, func() {
c, fb := featureBreaker.FilterRDS(memory.Use(context.Background()), nil)
c, ctr := FilterRDS(c)
So(c, ShouldNotBeNil)
So(ctr, ShouldNotBeNil)
ds := datastore.Get(c)
vals := []datastore.PropertyMap{{
"Val": {datastore.MkProperty(100)},
"$key": {datastore.MkPropertyNI(ds.NewKey("Kind", "", 1, nil))},
}}
Convey("Calling a ds function should reflect in counter", func() {
So(ds.PutMulti(vals), ShouldBeNil)
So(ctr.PutMulti.Successes(), ShouldEqual, 1)
Convey("effects are cumulative", func() {
So(ds.PutMulti(vals), ShouldBeNil)
So(ctr.PutMulti.Successes(), ShouldEqual, 2)
Convey("even within transactions", func() {
die(ds.RunInTransaction(func(c context.Context) error {
ds := datastore.Get(c)
So(ds.PutMulti(append(vals, vals[0])), ShouldBeNil)
return nil
}, nil))
})
})
})
Convey("errors count against errors", func() {
fb.BreakFeatures(nil, "GetMulti")
So(ds.GetMulti(vals), ShouldErrLike, `"GetMulti" is broken`)
So(ctr.GetMulti.Errors(), ShouldEqual, 1)
fb.UnbreakFeatures("GetMulti")
So(ds.PutMulti(vals), ShouldBeNil)
die(ds.GetMulti(vals))
So(ctr.GetMulti.Errors(), ShouldEqual, 1)
So(ctr.GetMulti.Successes(), ShouldEqual, 1)
So(ctr.GetMulti.Total(), ShouldEqual, 2)
})
})
Convey("works for memcache", t, func() {
c, ctr := FilterMC(memory.Use(context.Background()))
So(c, ShouldNotBeNil)
So(ctr, ShouldNotBeNil)
mc := memcache.Get(c)
die(mc.Set(mc.NewItem("hello").SetValue([]byte("sup"))))
_, err := mc.Get("Wat")
So(err, ShouldNotBeNil)
_, err = mc.Get("hello")
die(err)
So(ctr.SetMulti, shouldHaveSuccessesAndErrors, 1, 0)
So(ctr.GetMulti, shouldHaveSuccessesAndErrors, 2, 0)
So(ctr.NewItem, shouldHaveSuccessesAndErrors, 3, 0)
})
Convey("works for taskqueue", t, func() {
c, ctr := FilterTQ(memory.Use(context.Background()))
So(c, ShouldNotBeNil)
So(ctr, ShouldNotBeNil)
tq := taskqueue.Get(c)
die(tq.Add(&taskqueue.Task{Name: "wat"}, ""))
So(tq.Add(&taskqueue.Task{Name: "wat"}, "DNE_QUEUE"),
ShouldErrLike, "UNKNOWN_QUEUE")
So(ctr.AddMulti, shouldHaveSuccessesAndErrors, 1, 1)
})
Convey("works for global info", t, func() {
c, fb := featureBreaker.FilterGI(memory.Use(context.Background()), nil)
c, ctr := FilterGI(c)
So(c, ShouldNotBeNil)
So(ctr, ShouldNotBeNil)
gi := info.Get(c)
_, err := gi.Namespace("foo")
die(err)
fb.BreakFeatures(nil, "Namespace")
_, err = gi.Namespace("boom")
So(err, ShouldErrLike, `"Namespace" is broken`)
So(ctr.Namespace, shouldHaveSuccessesAndErrors, 1, 1)
})
Convey("works for user", t, func() {
c, fb := featureBreaker.FilterUser(memory.Use(context.Background()), nil)
c, ctr := FilterUser(c)
So(c, ShouldNotBeNil)
So(ctr, ShouldNotBeNil)
u := user.Get(c)
_, err := u.CurrentOAuth("foo")
die(err)
fb.BreakFeatures(nil, "CurrentOAuth")
_, err = u.CurrentOAuth("foo")
So(err, ShouldErrLike, `"CurrentOAuth" is broken`)
So(ctr.CurrentOAuth, shouldHaveSuccessesAndErrors, 1, 1)
})
Convey("works for mail", t, func() {
c, fb := featureBreaker.FilterMail(memory.Use(context.Background()), nil)
c, ctr := FilterMail(c)
So(c, ShouldNotBeNil)
So(ctr, ShouldNotBeNil)
m := mail.Get(c)
err := m.Send(&mail.Message{
Sender: "*****@*****.**",
To: []string{"*****@*****.**"},
Body: "hi",
})
die(err)
fb.BreakFeatures(nil, "Send")
err = m.Send(&mail.Message{
Sender: "*****@*****.**",
To: []string{"*****@*****.**"},
Body: "hi",
})
So(err, ShouldErrLike, `"Send" is broken`)
So(ctr.Send, shouldHaveSuccessesAndErrors, 1, 1)
})
}
func TestSimple(t *testing.T) {
// TODO(riannucci): Mock time.After so that we don't have to delay for real.
const key = memlockKeyPrefix + "testkey"
Convey("basic locking", t, func() {
start := time.Date(1986, time.October, 26, 1, 20, 00, 00, time.UTC)
ctx, clk := testclock.UseTime(context.Background(), start)
blocker := make(chan struct{})
clk.SetTimerCallback(func(clock.Timer) {
clk.Add(delay)
select {
case blocker <- struct{}{}:
default:
}
})
waitFalse := func(ctx context.Context) {
loop:
for {
select {
case <-blocker:
continue
case <-ctx.Done():
break loop
}
}
}
ctx, fb := featureBreaker.FilterMC(memory.Use(ctx), nil)
mc := memcache.Get(ctx)
Convey("fails to acquire when memcache is down", func() {
fb.BreakFeatures(nil, "Add")
err := TryWithLock(ctx, "testkey", "id", func(context.Context) error {
// should never reach here
So(false, ShouldBeTrue)
return nil
})
So(err, ShouldEqual, ErrFailedToLock)
})
Convey("returns the inner error", func() {
toRet := fmt.Errorf("sup")
err := TryWithLock(ctx, "testkey", "id", func(context.Context) error {
return toRet
})
So(err, ShouldEqual, toRet)
})
Convey("returns the error", func() {
toRet := fmt.Errorf("sup")
err := TryWithLock(ctx, "testkey", "id", func(context.Context) error {
return toRet
})
So(err, ShouldEqual, toRet)
})
Convey("can acquire when empty", func() {
err := TryWithLock(ctx, "testkey", "id", func(ctx context.Context) error {
isDone := func() bool {
select {
case <-ctx.Done():
return true
default:
return false
}
}
So(isDone(), ShouldBeFalse)
Convey("waiting for a while keeps refreshing the lock", func() {
// simulate waiting for 64*delay time, and ensuring that checkLoop
// runs that many times.
for i := 0; i < 64; i++ {
<-blocker
clk.Add(delay)
}
So(isDone(), ShouldBeFalse)
})
Convey("but sometimes we might lose it", func() {
Convey("because it was evicted", func() {
mc.Delete(key)
clk.Add(memcacheLockTime)
waitFalse(ctx)
})
Convey("or because of service issues", func() {
fb.BreakFeatures(nil, "CompareAndSwap")
waitFalse(ctx)
})
})
return nil
})
So(err, ShouldBeNil)
})
Convey("can lose it when it gets stolen", func() {
gbf := &getBlockerFilter{}
ctx = memcache.AddFilters(ctx, func(_ context.Context, mc memcache.Interface) memcache.Interface {
gbf.Interface = mc
return gbf
})
mc = memcache.Get(ctx)
err := TryWithLock(ctx, "testkey", "id", func(ctx context.Context) error {
// simulate waiting for 64*delay time, and ensuring that checkLoop
// runs that many times.
for i := 0; i < 64; i++ {
<-blocker
clk.Add(delay)
}
gbf.Lock()
mc.Set(mc.NewItem(key).SetValue([]byte("wat")))
gbf.Unlock()
waitFalse(ctx)
return nil
})
So(err, ShouldBeNil)
})
Convey("an empty context id is an error", func() {
So(TryWithLock(ctx, "testkey", "", nil), ShouldEqual, ErrEmptyClientID)
})
})
}
func TestMemcache(t *testing.T) {
t.Parallel()
Convey("memcache", t, func() {
now := time.Date(2015, 1, 1, 0, 0, 0, 0, time.UTC)
c, tc := testclock.UseTime(context.Background(), now)
c = Use(c)
mc := mcS.Get(c)
Convey("implements MCSingleReadWriter", func() {
Convey("Add", func() {
itm := (mc.NewItem("sup").
SetValue([]byte("cool")).
SetExpiration(time.Second))
So(mc.Add(itm), ShouldBeNil)
Convey("which rejects objects already there", func() {
So(mc.Add(itm), ShouldEqual, mcS.ErrNotStored)
})
})
Convey("Get", func() {
itm := &mcItem{
key: "sup",
value: []byte("cool"),
expiration: time.Second,
}
So(mc.Add(itm), ShouldBeNil)
testItem := &mcItem{
key: "sup",
value: []byte("cool"),
CasID: 1,
}
getItm, err := mc.Get("sup")
So(err, ShouldBeNil)
So(getItm, ShouldResemble, testItem)
Convey("which can expire", func() {
tc.Add(time.Second * 4)
getItm, err := mc.Get("sup")
So(err, ShouldEqual, mcS.ErrCacheMiss)
So(getItm, ShouldResemble, &mcItem{key: "sup"})
})
})
Convey("Delete", func() {
Convey("works if it's there", func() {
itm := &mcItem{
key: "sup",
value: []byte("cool"),
expiration: time.Second,
}
So(mc.Add(itm), ShouldBeNil)
So(mc.Delete("sup"), ShouldBeNil)
_, err := mc.Get("sup")
So(err, ShouldEqual, mcS.ErrCacheMiss)
})
Convey("but not if it's not there", func() {
So(mc.Delete("sup"), ShouldEqual, mcS.ErrCacheMiss)
})
})
Convey("Set", func() {
itm := &mcItem{
key: "sup",
value: []byte("cool"),
expiration: time.Second,
}
So(mc.Add(itm), ShouldBeNil)
itm.SetValue([]byte("newp"))
So(mc.Set(itm), ShouldBeNil)
testItem := &mcItem{
key: "sup",
value: []byte("newp"),
CasID: 2,
}
getItm, err := mc.Get("sup")
So(err, ShouldBeNil)
So(getItm, ShouldResemble, testItem)
Convey("Flush works too", func() {
So(mc.Flush(), ShouldBeNil)
_, err := mc.Get("sup")
So(err, ShouldEqual, mcS.ErrCacheMiss)
})
})
Convey("Set (nil) is equivalent to Set([]byte{})", func() {
So(mc.Set(mc.NewItem("bob")), ShouldBeNil)
bob, err := mc.Get("bob")
So(err, ShouldBeNil)
So(bob.Value(), ShouldResemble, []byte{})
})
Convey("Increment", func() {
val, err := mc.Increment("num", 7, 2)
So(err, ShouldBeNil)
So(val, ShouldEqual, 9)
Convey("IncrementExisting", func() {
val, err := mc.IncrementExisting("num", -2)
So(err, ShouldBeNil)
So(val, ShouldEqual, 7)
val, err = mc.IncrementExisting("num", -100)
So(err, ShouldBeNil)
So(val, ShouldEqual, 0)
_, err = mc.IncrementExisting("noexist", 2)
So(err, ShouldEqual, mcS.ErrCacheMiss)
So(mc.Set(mc.NewItem("text").SetValue([]byte("hello world, hooman!"))), ShouldBeNil)
_, err = mc.IncrementExisting("text", 2)
So(err.Error(), ShouldContainSubstring, "got invalid current value")
})
})
Convey("CompareAndSwap", func() {
itm := mcS.Item(&mcItem{
key: "sup",
value: []byte("cool"),
expiration: time.Second * 2,
})
So(mc.Add(itm), ShouldBeNil)
Convey("works after a Get", func() {
itm, err := mc.Get("sup")
So(err, ShouldBeNil)
So(itm.(*mcItem).CasID, ShouldEqual, 1)
itm.SetValue([]byte("newp"))
So(mc.CompareAndSwap(itm), ShouldBeNil)
})
Convey("but fails if you don't", func() {
itm.SetValue([]byte("newp"))
So(mc.CompareAndSwap(itm), ShouldEqual, mcS.ErrCASConflict)
})
Convey("and fails if the item is expired/gone", func() {
tc.Add(3 * time.Second)
itm.SetValue([]byte("newp"))
So(mc.CompareAndSwap(itm), ShouldEqual, mcS.ErrNotStored)
})
})
})
Convey("check that the internal implementation is sane", func() {
curTime := now
err := mc.Add(&mcItem{
key: "sup",
value: []byte("cool"),
expiration: time.Second * 2,
})
for i := 0; i < 4; i++ {
_, err := mc.Get("sup")
So(err, ShouldBeNil)
}
_, err = mc.Get("wot")
So(err, ShouldErrLike, mcS.ErrCacheMiss)
mci := mc.Raw().(*memcacheImpl)
stats, err := mc.Stats()
So(err, ShouldBeNil)
So(stats.Items, ShouldEqual, 1)
So(stats.Bytes, ShouldEqual, 4)
So(stats.Hits, ShouldEqual, 4)
So(stats.Misses, ShouldEqual, 1)
So(stats.ByteHits, ShouldEqual, 4*4)
So(mci.data.casID, ShouldEqual, 1)
So(mci.data.items["sup"], ShouldResemble, &mcDataItem{
value: []byte("cool"),
expiration: curTime.Add(time.Second * 2).Truncate(time.Second),
casID: 1,
})
getItm, err := mc.Get("sup")
So(err, ShouldBeNil)
So(len(mci.data.items), ShouldEqual, 1)
So(mci.data.casID, ShouldEqual, 1)
testItem := &mcItem{
key: "sup",
value: []byte("cool"),
CasID: 1,
}
So(getItm, ShouldResemble, testItem)
})
})
}
func TestContextAccess(t *testing.T) {
t.Parallel()
// p is a function which recovers an error and then immediately panics with
// the contained string. It's defer'd in each test so that we can use the
// ShouldPanicWith assertion (which does an == comparison and not
// a reflect.DeepEquals comparison).
p := func() { panic(recover().(error).Error()) }
Convey("Context Access", t, func() {
c := context.Background()
Convey("blank", func() {
So(dsS.GetRaw(c), ShouldBeNil)
So(mcS.GetRaw(c), ShouldBeNil)
So(tqS.GetRaw(c), ShouldBeNil)
So(infoS.Get(c), ShouldBeNil)
})
// needed for everything else
c = infoS.Set(c, Info())
Convey("Info", func() {
So(infoS.Get(c), ShouldNotBeNil)
So(func() {
defer p()
infoS.Get(c).Datacenter()
}, ShouldPanicWith, "dummy: method Info.Datacenter is not implemented")
})
Convey("Datastore", func() {
c = dsS.SetRaw(c, Datastore())
So(dsS.Get(c), ShouldNotBeNil)
So(func() {
defer p()
_, _ = dsS.Get(c).DecodeCursor("wut")
}, ShouldPanicWith, "dummy: method Datastore.DecodeCursor is not implemented")
})
Convey("Memcache", func() {
c = mcS.SetRaw(c, Memcache())
So(mcS.Get(c), ShouldNotBeNil)
So(func() {
defer p()
_ = mcS.Get(c).Add(nil)
}, ShouldPanicWith, "dummy: method Memcache.AddMulti is not implemented")
})
Convey("TaskQueue", func() {
c = tqS.SetRaw(c, TaskQueue())
So(tqS.Get(c), ShouldNotBeNil)
So(func() {
defer p()
_ = tqS.Get(c).Purge("")
}, ShouldPanicWith, "dummy: method TaskQueue.Purge is not implemented")
})
Convey("User", func() {
c = userS.Set(c, User())
So(userS.Get(c), ShouldNotBeNil)
So(func() {
defer p()
_ = userS.Get(c).IsAdmin()
}, ShouldPanicWith, "dummy: method User.IsAdmin is not implemented")
})
Convey("Mail", func() {
c = mailS.Set(c, Mail())
So(mailS.Get(c), ShouldNotBeNil)
So(func() {
defer p()
_ = mailS.Get(c).Send(nil)
}, ShouldPanicWith, "dummy: method Mail.Send is not implemented")
})
})
}
func TestBasicDatastore(t *testing.T) {
t.Parallel()
Convey("basic", t, func() {
inst, err := aetest.NewInstance(&aetest.Options{
StronglyConsistentDatastore: true,
})
So(err, ShouldBeNil)
defer inst.Close()
req, err := inst.NewRequest("GET", "/", nil)
So(err, ShouldBeNil)
ctx := Use(context.Background(), req)
ds := datastore.Get(ctx)
mc := memcache.Get(ctx)
inf := info.Get(ctx)
Convey("logging allows you to tweak the level", func() {
// You have to visually confirm that this actually happens in the stdout
// of the test... yeah I know.
logging.Debugf(ctx, "SHOULD NOT SEE")
logging.Infof(ctx, "SHOULD SEE")
ctx = logging.SetLevel(ctx, logging.Debug)
logging.Debugf(ctx, "SHOULD SEE")
logging.Infof(ctx, "SHOULD SEE (2)")
})
Convey("Can probe/change Namespace", func() {
So(inf.GetNamespace(), ShouldEqual, "")
ctx, err = inf.Namespace("wat")
So(err, ShouldBeNil)
inf = info.Get(ctx)
So(inf.GetNamespace(), ShouldEqual, "wat")
ds = datastore.Get(ctx)
So(ds.MakeKey("Hello", "world").Namespace(), ShouldEqual, "wat")
})
Convey("Can get non-transactional context", func() {
ctx, err := inf.Namespace("foo")
So(err, ShouldBeNil)
ds = datastore.Get(ctx)
inf = info.Get(ctx)
ds.RunInTransaction(func(ctx context.Context) error {
So(ds.MakeKey("Foo", "bar").Namespace(), ShouldEqual, "foo")
So(ds.Put(&TestStruct{ValueI: []int64{100}}), ShouldBeNil)
err = datastore.GetNoTxn(ctx).RunInTransaction(func(ctx context.Context) error {
ds = datastore.Get(ctx)
So(ds.MakeKey("Foo", "bar").Namespace(), ShouldEqual, "foo")
So(ds.Put(&TestStruct{ValueI: []int64{100}}), ShouldBeNil)
return nil
}, nil)
So(err, ShouldBeNil)
return nil
}, nil)
})
Convey("Can Put/Get", func() {
orig := TestStruct{
ValueI: []int64{1, 7, 946688461000000, 996688461000000},
ValueB: []bool{true, false},
ValueS: []string{"hello", "world"},
ValueF: []float64{1.0, 7.0, 946688461000000.0, 996688461000000.0},
ValueBS: [][]byte{
[]byte("allo"),
[]byte("hello"),
[]byte("world"),
[]byte("zurple"),
},
ValueK: []*datastore.Key{
ds.NewKey("Something", "Cool", 0, nil),
ds.NewKey("Something", "", 1, nil),
ds.NewKey("Something", "Recursive", 0,
ds.NewKey("Parent", "", 2, nil)),
},
ValueBK: []blobstore.Key{"bellow", "hello"},
ValueGP: []datastore.GeoPoint{
{Lat: 120.7, Lng: 95.5},
},
}
So(ds.Put(&orig), ShouldBeNil)
ret := TestStruct{ID: orig.ID}
So(ds.Get(&ret), ShouldBeNil)
So(ret, ShouldResemble, orig)
// can't be sure the indexes have caught up... so sleep
time.Sleep(time.Second)
Convey("Can query", func() {
q := datastore.NewQuery("TestStruct")
ds.Run(q, func(ts *TestStruct) {
So(*ts, ShouldResemble, orig)
})
count, err := ds.Count(q)
So(err, ShouldBeNil)
So(count, ShouldEqual, 1)
})
Convey("Can project", func() {
q := datastore.NewQuery("TestStruct").Project("ValueS")
rslts := []datastore.PropertyMap{}
So(ds.GetAll(q, &rslts), ShouldBeNil)
So(rslts, ShouldResemble, []datastore.PropertyMap{
{
"$key": {mpNI(ds.KeyForObj(&orig))},
"ValueS": {mp("hello")},
},
{
"$key": {mpNI(ds.KeyForObj(&orig))},
"ValueS": {mp("world")},
},
})
q = datastore.NewQuery("TestStruct").Project("ValueBS")
rslts = []datastore.PropertyMap{}
So(ds.GetAll(q, &rslts), ShouldBeNil)
So(rslts, ShouldResemble, []datastore.PropertyMap{
{
"$key": {mpNI(ds.KeyForObj(&orig))},
"ValueBS": {mp("allo")},
},
{
"$key": {mpNI(ds.KeyForObj(&orig))},
"ValueBS": {mp("hello")},
},
{
"$key": {mpNI(ds.KeyForObj(&orig))},
"ValueBS": {mp("world")},
},
{
"$key": {mpNI(ds.KeyForObj(&orig))},
"ValueBS": {mp("zurple")},
},
})
count, err := ds.Count(q)
So(err, ShouldBeNil)
So(count, ShouldEqual, 4)
})
})
Convey("Can Put/Get (time)", func() {
// time comparisons in Go are wonky, so this is pulled out
pm := datastore.PropertyMap{
"$key": {mpNI(ds.NewKey("Something", "value", 0, nil))},
"Time": {
mp(time.Date(1938, time.January, 1, 1, 1, 1, 1, time.UTC)),
mp(time.Time{}),
},
}
So(ds.Put(&pm), ShouldBeNil)
rslt := datastore.PropertyMap{}
rslt.SetMeta("key", ds.KeyForObj(pm))
So(ds.Get(&rslt), ShouldBeNil)
So(pm["Time"][0].Value(), ShouldResemble, rslt["Time"][0].Value())
q := datastore.NewQuery("Something").Project("Time")
all := []datastore.PropertyMap{}
So(ds.GetAll(q, &all), ShouldBeNil)
So(len(all), ShouldEqual, 2)
prop := all[0]["Time"][0]
So(prop.Type(), ShouldEqual, datastore.PTInt)
tval, err := prop.Project(datastore.PTTime)
So(err, ShouldBeNil)
So(tval, ShouldResemble, time.Time{})
tval, err = all[1]["Time"][0].Project(datastore.PTTime)
So(err, ShouldBeNil)
So(tval, ShouldResemble, pm["Time"][0].Value())
ent := datastore.PropertyMap{
"$key": {mpNI(ds.MakeKey("Something", "value"))},
}
So(ds.Get(&ent), ShouldBeNil)
So(ent["Time"], ShouldResemble, pm["Time"])
})
Convey("memcache: Set (nil) is the same as Set ([]byte{})", func() {
So(mc.Set(mc.NewItem("bob")), ShouldBeNil) // normally would panic because Value is nil
bob, err := mc.Get("bob")
So(err, ShouldBeNil)
So(bob.Value(), ShouldResemble, []byte{})
})
})
}
func TestDSCache(t *testing.T) {
t.Parallel()
zeroTime, err := time.Parse("2006-01-02T15:04:05.999999999Z", "2006-01-02T15:04:05.999999999Z")
if err != nil {
panic(err)
}
Convey("Test dscache", t, func() {
c := mathrand.Set(context.Background(), rand.New(rand.NewSource(1)))
clk := testclock.New(zeroTime)
c = clock.Set(c, clk)
c = memory.Use(c)
dsUnder := datastore.Get(c)
mc := memcache.Get(c)
shardsForKey := func(k *datastore.Key) int {
last := k.LastTok()
if last.Kind == "shardObj" {
return int(last.IntID)
}
if last.Kind == "noCacheObj" {
return 0
}
return DefaultShards
}
numMemcacheItems := func() uint64 {
stats, err := mc.Stats()
So(err, ShouldBeNil)
return stats.Items
}
Convey("enabled cases", func() {
c = FilterRDS(c, shardsForKey)
ds := datastore.Get(c)
So(dsUnder, ShouldNotBeNil)
So(ds, ShouldNotBeNil)
So(mc, ShouldNotBeNil)
Convey("basically works", func() {
pm := datastore.PropertyMap{
"BigData": {datastore.MkProperty([]byte(""))},
"Value": {datastore.MkProperty("hi")},
}
encoded := append([]byte{0}, serialize.ToBytes(pm)...)
o := object{ID: 1, Value: "hi"}
So(ds.Put(&o), ShouldBeNil)
o = object{ID: 1}
So(dsUnder.Get(&o), ShouldBeNil)
So(o.Value, ShouldEqual, "hi")
itm, err := mc.Get(MakeMemcacheKey(0, ds.KeyForObj(&o)))
So(err, ShouldEqual, memcache.ErrCacheMiss)
o = object{ID: 1}
So(ds.Get(&o), ShouldBeNil)
So(o.Value, ShouldEqual, "hi")
itm, err = mc.Get(itm.Key())
So(err, ShouldBeNil)
So(itm.Value(), ShouldResemble, encoded)
Convey("now we don't need the datastore!", func() {
o := object{ID: 1}
// delete it, bypassing the cache filter. Don't do this in production
// unless you want a crappy cache.
So(dsUnder.Delete(ds.KeyForObj(&o)), ShouldBeNil)
itm, err := mc.Get(MakeMemcacheKey(0, ds.KeyForObj(&o)))
So(err, ShouldBeNil)
So(itm.Value(), ShouldResemble, encoded)
So(ds.Get(&o), ShouldBeNil)
So(o.Value, ShouldEqual, "hi")
})
Convey("deleting it properly records that fact, however", func() {
o := object{ID: 1}
So(ds.Delete(ds.KeyForObj(&o)), ShouldBeNil)
itm, err := mc.Get(MakeMemcacheKey(0, ds.KeyForObj(&o)))
So(err, ShouldEqual, memcache.ErrCacheMiss)
So(ds.Get(&o), ShouldEqual, datastore.ErrNoSuchEntity)
itm, err = mc.Get(itm.Key())
So(err, ShouldBeNil)
So(itm.Value(), ShouldResemble, []byte{})
// this one hits memcache
So(ds.Get(&o), ShouldEqual, datastore.ErrNoSuchEntity)
})
})
Convey("compression works", func() {
o := object{ID: 2, Value: `¯\_(ツ)_/¯`}
data := make([]byte, 4000)
for i := range data {
const alpha = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789!@#$%^&*()"
data[i] = alpha[i%len(alpha)]
}
o.BigData = data
So(ds.Put(&o), ShouldBeNil)
So(ds.Get(&o), ShouldBeNil)
itm, err := mc.Get(MakeMemcacheKey(0, ds.KeyForObj(&o)))
So(err, ShouldBeNil)
So(itm.Value()[0], ShouldEqual, ZlibCompression)
So(len(itm.Value()), ShouldEqual, 653) // a bit smaller than 4k
// ensure the next Get comes from the cache
So(dsUnder.Delete(ds.KeyForObj(&o)), ShouldBeNil)
o = object{ID: 2}
So(ds.Get(&o), ShouldBeNil)
So(o.Value, ShouldEqual, `¯\_(ツ)_/¯`)
So(o.BigData, ShouldResemble, data)
})
Convey("transactions", func() {
Convey("work", func() {
// populate an object @ ID1
So(ds.Put(&object{ID: 1, Value: "something"}), ShouldBeNil)
So(ds.Get(&object{ID: 1}), ShouldBeNil)
So(ds.Put(&object{ID: 2, Value: "nurbs"}), ShouldBeNil)
So(ds.Get(&object{ID: 2}), ShouldBeNil)
// memcache now has the wrong value (simulated race)
So(dsUnder.Put(&object{ID: 1, Value: "else"}), ShouldBeNil)
So(ds.RunInTransaction(func(c context.Context) error {
ds := datastore.Get(c)
o := &object{ID: 1}
So(ds.Get(o), ShouldBeNil)
So(o.Value, ShouldEqual, "else")
o.Value = "txn"
So(ds.Put(o), ShouldBeNil)
So(ds.Delete(ds.KeyForObj(&object{ID: 2})), ShouldBeNil)
return nil
}, &datastore.TransactionOptions{XG: true}), ShouldBeNil)
_, err := mc.Get(MakeMemcacheKey(0, ds.KeyForObj(&object{ID: 1})))
So(err, ShouldEqual, memcache.ErrCacheMiss)
_, err = mc.Get(MakeMemcacheKey(0, ds.KeyForObj(&object{ID: 2})))
So(err, ShouldEqual, memcache.ErrCacheMiss)
o := &object{ID: 1}
So(ds.Get(o), ShouldBeNil)
So(o.Value, ShouldEqual, "txn")
})
Convey("errors don't invalidate", func() {
// populate an object @ ID1
So(ds.Put(&object{ID: 1, Value: "something"}), ShouldBeNil)
So(ds.Get(&object{ID: 1}), ShouldBeNil)
So(numMemcacheItems(), ShouldEqual, 1)
So(ds.RunInTransaction(func(c context.Context) error {
ds := datastore.Get(c)
o := &object{ID: 1}
So(ds.Get(o), ShouldBeNil)
So(o.Value, ShouldEqual, "something")
o.Value = "txn"
So(ds.Put(o), ShouldBeNil)
return errors.New("OH NOES")
}, nil).Error(), ShouldContainSubstring, "OH NOES")
// memcache still has the original
So(numMemcacheItems(), ShouldEqual, 1)
So(dsUnder.Delete(ds.KeyForObj(&object{ID: 1})), ShouldBeNil)
o := &object{ID: 1}
So(ds.Get(o), ShouldBeNil)
So(o.Value, ShouldEqual, "something")
})
})
Convey("control", func() {
Convey("per-model bypass", func() {
type model struct {
ID string `gae:"$id"`
UseDSCache datastore.Toggle `gae:"$dscache.enable,false"`
Value string
}
itms := []model{
{ID: "hi", Value: "something"},
{ID: "there", Value: "else", UseDSCache: datastore.On},
}
So(ds.PutMulti(itms), ShouldBeNil)
So(ds.GetMulti(itms), ShouldBeNil)
So(numMemcacheItems(), ShouldEqual, 1)
})
Convey("per-key shard count", func() {
s := &shardObj{ID: 4, Value: "hi"}
So(ds.Put(s), ShouldBeNil)
So(ds.Get(s), ShouldBeNil)
So(numMemcacheItems(), ShouldEqual, 1)
for i := 0; i < 20; i++ {
So(ds.Get(s), ShouldBeNil)
}
So(numMemcacheItems(), ShouldEqual, 4)
})
Convey("per-key cache disablement", func() {
n := &noCacheObj{ID: "nurbs", Value: true}
So(ds.Put(n), ShouldBeNil)
So(ds.Get(n), ShouldBeNil)
So(numMemcacheItems(), ShouldEqual, 0)
})
Convey("per-model expiration", func() {
type model struct {
ID int64 `gae:"$id"`
DSCacheExp int64 `gae:"$dscache.expiration,7"`
Value string
}
So(ds.Put(&model{ID: 1, Value: "mooo"}), ShouldBeNil)
So(ds.Get(&model{ID: 1}), ShouldBeNil)
itm, err := mc.Get(MakeMemcacheKey(0, ds.KeyForObj(&model{ID: 1})))
So(err, ShouldBeNil)
clk.Add(10 * time.Second)
_, err = mc.Get(itm.Key())
So(err, ShouldEqual, memcache.ErrCacheMiss)
})
})
Convey("screw cases", func() {
Convey("memcache contains bogus value (simulated failed AddMulti)", func() {
o := &object{ID: 1, Value: "spleen"}
So(ds.Put(o), ShouldBeNil)
sekret := []byte("I am a banana")
itm := mc.NewItem(MakeMemcacheKey(0, ds.KeyForObj(o))).SetValue(sekret)
So(mc.Set(itm), ShouldBeNil)
o = &object{ID: 1}
So(ds.Get(o), ShouldBeNil)
So(o.Value, ShouldEqual, "spleen")
itm, err := mc.Get(itm.Key())
So(err, ShouldBeNil)
So(itm.Flags(), ShouldEqual, ItemUKNONWN)
So(itm.Value(), ShouldResemble, sekret)
})
Convey("memcache contains bogus value (corrupt entry)", func() {
o := &object{ID: 1, Value: "spleen"}
So(ds.Put(o), ShouldBeNil)
sekret := []byte("I am a banana")
itm := (mc.NewItem(MakeMemcacheKey(0, ds.KeyForObj(o))).
SetValue(sekret).
SetFlags(uint32(ItemHasData)))
So(mc.Set(itm), ShouldBeNil)
o = &object{ID: 1}
So(ds.Get(o), ShouldBeNil)
So(o.Value, ShouldEqual, "spleen")
itm, err := mc.Get(itm.Key())
So(err, ShouldBeNil)
So(itm.Flags(), ShouldEqual, ItemHasData)
So(itm.Value(), ShouldResemble, sekret)
})
Convey("other entity has the lock", func() {
o := &object{ID: 1, Value: "spleen"}
So(ds.Put(o), ShouldBeNil)
sekret := []byte("r@vmarod!#)%9T")
itm := (mc.NewItem(MakeMemcacheKey(0, ds.KeyForObj(o))).
SetValue(sekret).
SetFlags(uint32(ItemHasLock)))
So(mc.Set(itm), ShouldBeNil)
o = &object{ID: 1}
So(ds.Get(o), ShouldBeNil)
So(o.Value, ShouldEqual, "spleen")
itm, err := mc.Get(itm.Key())
So(err, ShouldBeNil)
So(itm.Flags(), ShouldEqual, ItemHasLock)
So(itm.Value(), ShouldResemble, sekret)
})
Convey("massive entities can't be cached", func() {
o := &object{ID: 1, Value: "spleen"}
mr := mathrand.Get(c)
numRounds := (internalValueSizeLimit / 8) * 2
buf := bytes.Buffer{}
for i := 0; i < numRounds; i++ {
So(binary.Write(&buf, binary.LittleEndian, mr.Int63()), ShouldBeNil)
}
o.BigData = buf.Bytes()
So(ds.Put(o), ShouldBeNil)
o.BigData = nil
So(ds.Get(o), ShouldBeNil)
itm, err := mc.Get(MakeMemcacheKey(0, ds.KeyForObj(o)))
So(err, ShouldBeNil)
// Is locked until the next put, forcing all access to the datastore.
So(itm.Value(), ShouldResemble, []byte{})
So(itm.Flags(), ShouldEqual, ItemHasLock)
o.BigData = []byte("hi :)")
So(ds.Put(o), ShouldBeNil)
So(ds.Get(o), ShouldBeNil)
itm, err = mc.Get(itm.Key())
So(err, ShouldBeNil)
So(itm.Flags(), ShouldEqual, ItemHasData)
})
Convey("failure on Setting memcache locks is a hard stop", func() {
c, fb := featureBreaker.FilterMC(c, nil)
fb.BreakFeatures(nil, "SetMulti")
ds := datastore.Get(c)
So(ds.Put(&object{ID: 1}).Error(), ShouldContainSubstring, "SetMulti")
})
Convey("failure on Setting memcache locks in a transaction is a hard stop", func() {
c, fb := featureBreaker.FilterMC(c, nil)
fb.BreakFeatures(nil, "SetMulti")
ds := datastore.Get(c)
So(ds.RunInTransaction(func(c context.Context) error {
So(datastore.Get(c).Put(&object{ID: 1}), ShouldBeNil)
// no problems here... memcache operations happen after the function
// body quits.
return nil
}, nil).Error(), ShouldContainSubstring, "SetMulti")
})
})
Convey("misc", func() {
Convey("verify numShards caps at MaxShards", func() {
sc := supportContext{shardsForKey: shardsForKey}
So(sc.numShards(ds.KeyForObj(&shardObj{ID: 9001})), ShouldEqual, MaxShards)
})
Convey("CompressionType.String", func() {
So(NoCompression.String(), ShouldEqual, "NoCompression")
So(ZlibCompression.String(), ShouldEqual, "ZlibCompression")
So(CompressionType(100).String(), ShouldEqual, "UNKNOWN_CompressionType(100)")
})
})
})
Convey("disabled cases", func() {
defer func() {
globalEnabled = true
}()
So(IsGloballyEnabled(c), ShouldBeTrue)
So(SetGlobalEnable(c, false), ShouldBeNil)
// twice is a nop
So(SetGlobalEnable(c, false), ShouldBeNil)
// but it takes 5 minutes to kick in
So(IsGloballyEnabled(c), ShouldBeTrue)
clk.Add(time.Minute*5 + time.Second)
So(IsGloballyEnabled(c), ShouldBeFalse)
So(mc.Set(mc.NewItem("test").SetValue([]byte("hi"))), ShouldBeNil)
So(numMemcacheItems(), ShouldEqual, 1)
So(SetGlobalEnable(c, true), ShouldBeNil)
// memcache gets flushed as a side effect
So(numMemcacheItems(), ShouldEqual, 0)
// Still takes 5 minutes to kick in
So(IsGloballyEnabled(c), ShouldBeFalse)
clk.Add(time.Minute*5 + time.Second)
So(IsGloballyEnabled(c), ShouldBeTrue)
})
})
}
func TestCount(t *testing.T) {
t.Parallel()
Convey("Test Count filter", t, func() {
c, fb := featureBreaker.FilterRDS(memory.Use(context.Background()), nil)
c, ctr := FilterRDS(c)
So(c, ShouldNotBeNil)
So(ctr, ShouldNotBeNil)
ds := datastore.Get(c)
vals := []datastore.PropertyMap{{
"Val": {datastore.MkProperty(100)},
"$key": {datastore.MkPropertyNI(ds.NewKey("Kind", "", 1, nil))},
}}
Convey("Calling a ds function should reflect in counter", func() {
So(ds.PutMulti(vals), ShouldBeNil)
So(ctr.NewKey.Successes(), ShouldEqual, 1)
So(ctr.PutMulti.Successes(), ShouldEqual, 1)
Convey("effects are cumulative", func() {
So(ds.PutMulti(vals), ShouldBeNil)
So(ctr.PutMulti.Successes(), ShouldEqual, 2)
Convey("even within transactions", func() {
ds.RunInTransaction(func(c context.Context) error {
ds := datastore.Get(c)
So(ds.PutMulti(append(vals, vals[0])), ShouldBeNil)
return nil
}, nil)
})
})
})
Convey("errors count against errors", func() {
fb.BreakFeatures(nil, "GetMulti")
ds.GetMulti(vals)
So(ctr.GetMulti.Errors(), ShouldEqual, 1)
fb.UnbreakFeatures("GetMulti")
So(ds.PutMulti(vals), ShouldBeNil)
ds.GetMulti(vals)
So(ctr.GetMulti.Errors(), ShouldEqual, 1)
So(ctr.GetMulti.Successes(), ShouldEqual, 1)
So(ctr.GetMulti.Total(), ShouldEqual, 2)
})
})
Convey("works for memcache", t, func() {
c, ctr := FilterMC(memory.Use(context.Background()))
So(c, ShouldNotBeNil)
So(ctr, ShouldNotBeNil)
mc := memcache.Get(c)
mc.Set(mc.NewItem("hello").SetValue([]byte("sup")))
So(mc.Get(mc.NewItem("Wat")), ShouldNotBeNil)
mc.Get(mc.NewItem("hello"))
So(ctr.SetMulti, shouldHaveSuccessesAndErrors, 1, 0)
So(ctr.GetMulti, shouldHaveSuccessesAndErrors, 2, 0)
So(ctr.NewItem, shouldHaveSuccessesAndErrors, 3, 0)
})
Convey("works for taskqueue", t, func() {
c, ctr := FilterTQ(memory.Use(context.Background()))
So(c, ShouldNotBeNil)
So(ctr, ShouldNotBeNil)
tq := taskqueue.Get(c)
tq.Add(&taskqueue.Task{Name: "wat"}, "")
tq.Add(&taskqueue.Task{Name: "wat"}, "DNE_QUEUE")
So(ctr.AddMulti, shouldHaveSuccessesAndErrors, 1, 1)
})
Convey("works for global info", t, func() {
c, fb := featureBreaker.FilterGI(memory.Use(context.Background()), nil)
c, ctr := FilterGI(c)
So(c, ShouldNotBeNil)
So(ctr, ShouldNotBeNil)
gi := info.Get(c)
gi.Namespace("foo")
fb.BreakFeatures(nil, "Namespace")
gi.Namespace("boom")
So(ctr.Namespace, shouldHaveSuccessesAndErrors, 1, 1)
})
}
