store: fix store_test.go comments

store/store_test.go

@@ -788,7 +788,7 @@ func TestStoreWatchExpireRefresh(t *testing.T) {
 	w, _ = s.Watch("/", true, false, 4)
 	fc.Advance(700 * time.Millisecond)
 	s.DeleteExpiredKeys(fc.Now())
-	eidx = 5 // We should skip 4 because a TTL update should occur with no watch notification
+	eidx = 5 // We should skip 4 because a TTL update should occur with no watch notification if set `TTLOptionSet.Refresh` to true
 	assert.Equal(t, w.StartIndex(), eidx-1, "")
 	e = nbselect(w.EventChan())
 	assert.Equal(t, e.EtcdIndex, eidx, "")
@@ -812,7 +812,7 @@ func TestStoreWatchExpireEmptyRefresh(t *testing.T) {
 	w, _ := s.Watch("/", true, false, 2)
 	fc.Advance(700 * time.Millisecond)
 	s.DeleteExpiredKeys(fc.Now())
-	eidx = 3 // We should skip 2 because a TTL update should occur with no watch notification
+	eidx = 3 // We should skip 2 because a TTL update should occur with no watch notification if set `TTLOptionSet.Refresh` to true
 	assert.Equal(t, w.StartIndex(), eidx-1, "")
 	e := nbselect(w.EventChan())
 	assert.Equal(t, e.EtcdIndex, eidx, "")
@@ -821,6 +821,32 @@ func TestStoreWatchExpireEmptyRefresh(t *testing.T) {
 	assert.Equal(t, *e.PrevNode.Value, "bar", "")
 }
 
+// Update TTL of a key (set TTLOptionSet.Refresh to false) and send notification
+func TestStoreWatchNoRefresh(t *testing.T) {
+	s := newStore()
+	fc := newFakeClock()
+	s.clock = fc
+
+	var eidx uint64 = 1
+	s.Create("/foo", false, "bar", false, TTLOptionSet{ExpireTime: fc.Now().Add(500 * time.Millisecond), Refresh: true})
+	// Should be no-op
+	fc.Advance(200 * time.Millisecond)
+	s.DeleteExpiredKeys(fc.Now())
+
+	// Update key's TTL with setting `TTLOptionSet.Refresh` to false will cause an update event
+	s.Update("/foo", "", TTLOptionSet{ExpireTime: fc.Now().Add(500 * time.Millisecond), Refresh: false})
+	w, _ := s.Watch("/", true, false, 2)
+	fc.Advance(700 * time.Millisecond)
+	s.DeleteExpiredKeys(fc.Now())
+	eidx = 2
+	assert.Equal(t, w.StartIndex(), eidx, "")
+	e := nbselect(w.EventChan())
+	assert.Equal(t, e.EtcdIndex, eidx, "")
+	assert.Equal(t, e.Action, "update", "")
+	assert.Equal(t, e.Node.Key, "/foo", "")
+	assert.Equal(t, *e.PrevNode.Value, "bar", "")
+}
+
 // Ensure that the store can update the TTL on a value with refresh.
 func TestStoreRefresh(t *testing.T) {
 	s := newStore()
@@ -1045,17 +1071,23 @@ func TestStoreWatchRecursiveCreateDeeperThanHiddenKey(t *testing.T) {
 
 // Ensure that slow consumers are handled properly.
 //
-// Since Watcher.EventChan() has a buffer of size 1 we can only queue 1
+// Since Watcher.EventChan() has a buffer of size 100 we can only queue 100
 // event per watcher. If the consumer cannot consume the event on time and
 // another event arrives, the channel is closed and event is discarded.
 // This test ensures that after closing the channel, the store can continue
 // to operate correctly.
 func TestStoreWatchSlowConsumer(t *testing.T) {
 	s := newStore()
-	s.Watch("/foo", true, true, 0)                                 // stream must be true
-	s.Set("/foo", false, "1", TTLOptionSet{ExpireTime: Permanent}) // ok
-	s.Set("/foo", false, "2", TTLOptionSet{ExpireTime: Permanent}) // ok
-	s.Set("/foo", false, "3", TTLOptionSet{ExpireTime: Permanent}) // must not panic
+	s.Watch("/foo", true, true, 0) // stream must be true
+	// Fill watch channel with 100 events
+	for i := 1; i <= 100; i++ {
+		s.Set("/foo", false, string(i), TTLOptionSet{ExpireTime: Permanent}) // ok
+	}
+	assert.Equal(t, s.WatcherHub.count, int64(1), "")
+	s.Set("/foo", false, "101", TTLOptionSet{ExpireTime: Permanent}) // ok
+	// remove watcher
+	assert.Equal(t, s.WatcherHub.count, int64(0), "")
+	s.Set("/foo", false, "102", TTLOptionSet{ExpireTime: Permanent}) // must not panic
 }
 
 // Performs a non-blocking select on an event channel.