fix: fan out unread presence to online sessions

server/realtime_dispatcher_test.go

@@ -52,6 +52,62 @@ func TestRealtimeEnvelopeDeliversToUserSessions(t *testing.T) {
 	}
 }
 
+func TestRealtimeUserPresenceSkipsSessionsAttachedToTopic(t *testing.T) {
+	oldStore := globals.sessionStore
+	defer func() { globals.sessionStore = oldStore }()
+
+	tenantID := types.TenantID(1)
+	sender := types.Uid(1001)
+	recipient := types.Uid(1002)
+	topic := sender.P2PName(recipient)
+	if topic == "" {
+		t.Fatal("failed to create p2p topic")
+	}
+	visibleTopic, err := types.P2PNameForUser(recipient, topic)
+	if err != nil || visibleTopic == "" {
+		t.Fatalf("failed to create visible topic: %v", err)
+	}
+	globals.sessionStore = realtimeTestSessionStore(
+		realtimeTestSession("sid-attached", tenantID, recipient, visibleTopic),
+		realtimeTestSession("sid-me-only", tenantID, recipient, ""),
+	)
+	msg := &ServerComMessage{
+		Pres: &MsgServerPres{
+			Topic:     "me",
+			Src:       topic,
+			What:      "msg",
+			SeqId:     35,
+			SkipTopic: topic,
+		},
+	}
+	raw, err := json.Marshal(msg)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	deliverRealtimeFanoutEnvelope(&store.RealtimeFanoutEnvelope{
+		TenantID:   tenantID,
+		Kind:       realtimeKindMessage,
+		TargetType: realtimeTargetUser,
+		Target:     recipient.UserId(),
+		SkipTopic:  topic,
+		Message:    raw,
+	})
+
+	if len(globals.sessionStore.Get("sid-attached").send) != 0 {
+		t.Fatal("attached p2p session must not receive duplicate me presence")
+	}
+	select {
+	case got := <-globals.sessionStore.Get("sid-me-only").send:
+		pres := got.(*ServerComMessage).Pres
+		if pres == nil || pres.Topic != "me" || pres.What != "msg" || pres.Src != topic || pres.SeqId != 35 {
+			t.Fatalf("unexpected presence: %#v", pres)
+		}
+	default:
+		t.Fatal("me-only session must receive message presence")
+	}
+}
+
 func TestRealtimeP2PTopicFallbackRewritesVisibleTopic(t *testing.T) {
 	oldStore := globals.sessionStore
 	oldHub := globals.hub