add placeholder functions for websocket state tracker

reactivity/tracker.go

@@ -2,12 +2,22 @@ package reactivity
 
 import "github.com/gorilla/websocket"
 
-type Subscription struct {
-	ID   string
-	Conn *websocket.Conn
+// TODO: populate with needed structures for tracking state
+type Tracker struct {
 }
 
-type Channel struct {
-	ID            string
-	Subscriptions []*Subscription
+func NewTracker() *Tracker {
+	return &Tracker{}
+}
+
+func (t *Tracker) Track(conn *websocket.Conn) {}
+
+func (t *Tracker) Untrack(conn *websocket.Conn) {}
+
+func (t *Tracker) SubscribeToQuery(query string) {}
+
+func (t *Tracker) UnsubscribeFromQuery(query string) {}
+
+func (t *Tracker) GetQuerySubscriptions() []string {
+	return []string{}
 }