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rpc: fix subscription corner case and speed up tests (#17874) 

Notifier tracks whether subscription are 'active'. A subscription
becomes active when the subscription ID has been sent to the client. If
the client sends notifications in the request handler before the
subscription becomes active they are dropped. The tests tried to work
around this problem by always waiting 5s before sending the first
notification.

Fix it by buffering notifications until the subscription becomes active.
This speeds up all subscription tests.

Also fix TestSubscriptionMultipleNamespaces to wait for three messages
per subscription instead of six. The test now finishes just after all
notifications have been received and doesn't hit the 30s timeout anymore.
This commit is contained in:
Felix Lange 2018-10-09 16:34:24 +02:00 committed by GitHub
parent da290e9707
commit 4e474c74dc
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 67 additions and 70 deletions
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34
rpc/subscription.go
View File

@ -52,9 +52,10 @@ type notifierKey struct{}
// Server callbacks use the notifier to send notifications.
type Notifier struct {
codec ServerCodec
subMu sync.RWMutex // guards active and inactive maps
subMu sync.Mutex
active map[ID]*Subscription
inactive map[ID]*Subscription
buffer map[ID][]interface{} // unsent notifications of inactive subscriptions
}
// newNotifier creates a new notifier that can be used to send subscription
@ -64,6 +65,7 @@ func newNotifier(codec ServerCodec) *Notifier {
codec: codec,
active: make(map[ID]*Subscription),
inactive: make(map[ID]*Subscription),
buffer: make(map[ID][]interface{}),
}
}
@ -88,20 +90,26 @@ func (n *Notifier) CreateSubscription() *Subscription {
// Notify sends a notification to the client with the given data as payload.
// If an error occurs the RPC connection is closed and the error is returned.
func (n *Notifier) Notify(id ID, data interface{}) error {
n.subMu.RLock()
defer n.subMu.RUnlock()
n.subMu.Lock()
defer n.subMu.Unlock()
sub, active := n.active[id]
if active {
notification := n.codec.CreateNotification(string(id), sub.namespace, data)
if err := n.codec.Write(notification); err != nil {
n.codec.Close()
return err
}
if sub, active := n.active[id]; active {
n.send(sub, data)
} else {
n.buffer[id] = append(n.buffer[id], data)
}
return nil
}
func (n *Notifier) send(sub *Subscription, data interface{}) error {
notification := n.codec.CreateNotification(string(sub.ID), sub.namespace, data)
err := n.codec.Write(notification)
if err != nil {
n.codec.Close()
}
return err
}
// Closed returns a channel that is closed when the RPC connection is closed.
func (n *Notifier) Closed() <-chan interface{} {
return n.codec.Closed()
@ -127,9 +135,15 @@ func (n *Notifier) unsubscribe(id ID) error {
func (n *Notifier) activate(id ID, namespace string) {
n.subMu.Lock()
defer n.subMu.Unlock()
if sub, found := n.inactive[id]; found {
sub.namespace = namespace
n.active[id] = sub
delete(n.inactive, id)
// Send buffered notifications.
for _, data := range n.buffer[id] {
n.send(sub, data)
}
delete(n.buffer, id)
}
}

103
rpc/subscription_test.go
View File

@ -27,9 +27,8 @@ import (
)
type NotificationTestService struct {
mu sync.Mutex
unsubscribed bool
mu sync.Mutex
unsubscribed chan string
gotHangSubscriptionReq chan struct{}
unblockHangSubscription chan struct{}
}
@ -38,16 +37,10 @@ func (s *NotificationTestService) Echo(i int) int {
return i
}
func (s *NotificationTestService) wasUnsubCallbackCalled() bool {
s.mu.Lock()
defer s.mu.Unlock()
return s.unsubscribed
}
func (s *NotificationTestService) Unsubscribe(subid string) {
s.mu.Lock()
s.unsubscribed = true
s.mu.Unlock()
if s.unsubscribed != nil {
s.unsubscribed <- subid
}
}
func (s *NotificationTestService) SomeSubscription(ctx context.Context, n, val int) (*Subscription, error) {
@ -65,7 +58,6 @@ func (s *NotificationTestService) SomeSubscription(ctx context.Context, n, val i
// test expects n events, if we begin sending event immediately some events
// will probably be dropped since the subscription ID might not be send to
// the client.
time.Sleep(5 * time.Second)
for i := 0; i < n; i++ {
if err := notifier.Notify(subscription.ID, val+i); err != nil {
return
@ -74,13 +66,10 @@ func (s *NotificationTestService) SomeSubscription(ctx context.Context, n, val i
select {
case <-notifier.Closed():
s.mu.Lock()
s.unsubscribed = true
s.mu.Unlock()
case <-subscription.Err():
s.mu.Lock()
s.unsubscribed = true
s.mu.Unlock()
}
if s.unsubscribed != nil {
s.unsubscribed <- string(subscription.ID)
}
}()
@ -107,7 +96,7 @@ func (s *NotificationTestService) HangSubscription(ctx context.Context, val int)
func TestNotifications(t *testing.T) {
server := NewServer()
service := &NotificationTestService{}
service := &NotificationTestService{unsubscribed: make(chan string)}
if err := server.RegisterName("eth", service); err != nil {
t.Fatalf("unable to register test service %v", err)
@ -157,10 +146,10 @@ func TestNotifications(t *testing.T) {
}
clientConn.Close() // causes notification unsubscribe callback to be called
time.Sleep(1 * time.Second)
if !service.wasUnsubCallbackCalled() {
t.Error("unsubscribe callback not called after closing connection")
select {
case <-service.unsubscribed:
case <-time.After(1 * time.Second):
t.Fatal("Unsubscribe not called after one second")
}
}
@ -227,18 +216,19 @@ func waitForMessages(t *testing.T, in *json.Decoder, successes chan<- jsonSucces
// for multiple different namespaces.
func TestSubscriptionMultipleNamespaces(t *testing.T) {
var (
namespaces = []string{"eth", "shh", "bzz"}
namespaces = []string{"eth", "shh", "bzz"}
service = NotificationTestService{}
subCount = len(namespaces) * 2
notificationCount = 3
server = NewServer()
service = NotificationTestService{}
clientConn, serverConn = net.Pipe()
out = json.NewEncoder(clientConn)
in = json.NewDecoder(clientConn)
successes = make(chan jsonSuccessResponse)
failures = make(chan jsonErrResponse)
notifications = make(chan jsonNotification)
errors = make(chan error, 10)
out = json.NewEncoder(clientConn)
in = json.NewDecoder(clientConn)
successes = make(chan jsonSuccessResponse)
failures = make(chan jsonErrResponse)
notifications = make(chan jsonNotification)
errors = make(chan error, 10)
)
// setup and start server
@ -255,13 +245,12 @@ func TestSubscriptionMultipleNamespaces(t *testing.T) {
go waitForMessages(t, in, successes, failures, notifications, errors)
// create subscriptions one by one
n := 3
for i, namespace := range namespaces {
request := map[string]interface{}{
"id": i,
"method": fmt.Sprintf("%s_subscribe", namespace),
"version": "2.0",
"params": []interface{}{"someSubscription", n, i},
"params": []interface{}{"someSubscription", notificationCount, i},
}
if err := out.Encode(&request); err != nil {
@ -276,7 +265,7 @@ func TestSubscriptionMultipleNamespaces(t *testing.T) {
"id": i,
"method": fmt.Sprintf("%s_subscribe", namespace),
"version": "2.0",
"params": []interface{}{"someSubscription", n, i},
"params": []interface{}{"someSubscription", notificationCount, i},
})
}
@ -285,46 +274,40 @@ func TestSubscriptionMultipleNamespaces(t *testing.T) {
}
timeout := time.After(30 * time.Second)
subids := make(map[string]string, 2*len(namespaces))
count := make(map[string]int, 2*len(namespaces))
for {
done := true
for id := range count {
if count, found := count[id]; !found || count < (2*n) {
subids := make(map[string]string, subCount)
count := make(map[string]int, subCount)
allReceived := func() bool {
done := len(count) == subCount
for _, c := range count {
if c < notificationCount {
done = false
}
}
return done
}
if done && len(count) == len(namespaces) {
break
}
for !allReceived() {
select {
case err := <-errors:
t.Fatal(err)
case suc := <-successes: // subscription created
subids[namespaces[int(suc.Id.(float64))]] = suc.Result.(string)
case notification := <-notifications:
count[notification.Params.Subscription]++
case err := <-errors:
t.Fatal(err)
case failure := <-failures:
t.Errorf("received error: %v", failure.Error)
case notification := <-notifications:
if cnt, found := count[notification.Params.Subscription]; found {
count[notification.Params.Subscription] = cnt + 1
} else {
count[notification.Params.Subscription] = 1
}
case <-timeout:
for _, namespace := range namespaces {
subid, found := subids[namespace]
if !found {
t.Errorf("Subscription for '%s' not created", namespace)
t.Errorf("subscription for %q not created", namespace)
continue
}
if count, found := count[subid]; !found || count < n {
t.Errorf("Didn't receive all notifications (%d<%d) in time for namespace '%s'", count, n, namespace)
if count, found := count[subid]; !found || count < notificationCount {
t.Errorf("didn't receive all notifications (%d<%d) in time for namespace %q", count, notificationCount, namespace)
}
}
return
t.Fatal("timed out")
}
}
}