// TestSTMConflict tests that conflicts are retried.
func TestSTMConflict(t *testing.T) {
clus := NewClusterV3(t, &ClusterConfig{Size: 3})
defer clus.Terminate(t)
etcdc := clus.RandClient()
keys := make([]string, 5)
for i := 0; i < len(keys); i++ {
keys[i] = fmt.Sprintf("foo-%d", i)
if _, err := etcdc.Put(context.TODO(), keys[i], "100"); err != nil {
t.Fatalf("could not make key (%v)", err)
}
}
errc := make(chan error)
for i := range keys {
curEtcdc := clus.RandClient()
srcKey := keys[i]
applyf := func(stm concurrency.STM) error {
src := stm.Get(srcKey)
// must be different key to avoid double-adding
dstKey := srcKey
for dstKey == srcKey {
dstKey = keys[rand.Intn(len(keys))]
}
dst := stm.Get(dstKey)
srcV, _ := strconv.ParseInt(src, 10, 64)
dstV, _ := strconv.ParseInt(dst, 10, 64)
xfer := int64(rand.Intn(int(srcV)) / 2)
stm.Put(srcKey, fmt.Sprintf("%d", srcV-xfer))
stm.Put(dstKey, fmt.Sprintf("%d", dstV+xfer))
return nil
}
go func() {
_, err := concurrency.NewSTMRepeatable(context.TODO(), curEtcdc, applyf)
errc <- err
}()
}
// wait for txns
for range keys {
if err := <-errc; err != nil {
t.Fatalf("apply failed (%v)", err)
}
}
// ensure sum matches initial sum
sum := 0
for _, oldkey := range keys {
rk, err := etcdc.Get(context.TODO(), oldkey)
if err != nil {
t.Fatalf("couldn't fetch key %s (%v)", oldkey, err)
}
v, _ := strconv.ParseInt(string(rk.Kvs[0].Value), 10, 64)
sum += int(v)
}
if sum != len(keys)*100 {
t.Fatalf("bad sum. got %d, expected %d", sum, len(keys)*100)
}
}
func doSTM(ctx context.Context, client *v3.Client, requests <-chan stmApply) {
defer wg.Done()
for applyf := range requests {
st := time.Now()
_, err := v3sync.NewSTMRepeatable(context.TODO(), client, applyf)
var errStr string
if err != nil {
errStr = err.Error()
}
results <- result{errStr: errStr, duration: time.Since(st), happened: time.Now()}
bar.Increment()
}
}
// TestSTMPutNewKey confirms a STM put on a new key is visible after commit.
func TestSTMPutNewKey(t *testing.T) {
clus := NewClusterV3(t, &ClusterConfig{Size: 1})
defer clus.Terminate(t)
etcdc := clus.RandClient()
applyf := func(stm concurrency.STM) error {
stm.Put("foo", "bar")
return nil
}
if _, err := concurrency.NewSTMRepeatable(context.TODO(), etcdc, applyf); err != nil {
t.Fatalf("error on stm txn (%v)", err)
}
resp, err := etcdc.Get(context.TODO(), "foo")
if err != nil {
t.Fatalf("error fetching key (%v)", err)
}
if string(resp.Kvs[0].Value) != "bar" {
t.Fatalf("bad value. got %+v, expected 'bar' value", resp)
}
}
// TestSTMAbort tests that an aborted txn does not modify any keys.
func TestSTMAbort(t *testing.T) {
clus := NewClusterV3(t, &ClusterConfig{Size: 1})
defer clus.Terminate(t)
etcdc := clus.RandClient()
ctx, cancel := context.WithCancel(context.TODO())
applyf := func(stm concurrency.STM) error {
stm.Put("foo", "baz")
cancel()
stm.Put("foo", "bap")
return nil
}
if _, err := concurrency.NewSTMRepeatable(ctx, etcdc, applyf); err == nil {
t.Fatalf("no error on stm txn")
}
resp, err := etcdc.Get(context.TODO(), "foo")
if err != nil {
t.Fatalf("error fetching key (%v)", err)
}
if len(resp.Kvs) != 0 {
t.Fatalf("bad value. got %+v, expected nothing", resp)
}
}