Client UUID nodes from server sync count

main.go

@@ -124,6 +124,7 @@ func main() { // {{{
 
 	http.HandleFunc("/user/authenticate", AuthManager.AuthenticationHandler)
 
+	http.HandleFunc("/sync/from_server/count", authenticated(actionSyncFromServerCount))
 	http.HandleFunc("/sync/from_server/{sequence}/{offset}", authenticated(actionSyncFromServer))
 	http.HandleFunc("/sync/to_server", authenticated(actionSyncToServer))
 
@@ -252,12 +253,12 @@ func actionSyncFromServer(w http.ResponseWriter, r *http.Request) { // {{{
 
 	nodes, maxSeq, moreRowsExist, err := Nodes(user.UserID, offset, uint64(changedFrom), user.ClientUUID)
 	if err != nil {
-		Log.Error("/node/tree", "error", err)
+		Log.Error("/sync/from_server", "error", err)
 		httpError(w, err)
 		return
 	}
 
-	Log.Debug("/node/tree", "num_nodes", len(nodes), "maxSeq", maxSeq)
+	Log.Debug("/sync/from_server", "num_nodes", len(nodes), "maxSeq", maxSeq)
 	foo, _ := json.Marshal(nodes)
 	os.WriteFile(fmt.Sprintf("/tmp/nodes-%d.json", offset), foo, 0644)
 
@@ -269,6 +270,29 @@ func actionSyncFromServer(w http.ResponseWriter, r *http.Request) { // {{{
 	}{true, nodes, maxSeq, moreRowsExist})
 	w.Write(j)
 } // }}}
+func actionSyncFromServerCount(w http.ResponseWriter, r *http.Request) { // {{{
+	// The purpose of the Client UUID is to avoid
+	// sending nodes back once again to a client that
+	// just created or modified it.
+	user := getUser(r)
+	changedFrom, _ := strconv.Atoi(r.PathValue("sequence"))
+
+	count, err := NodesCount(user.UserID, uint64(changedFrom), user.ClientUUID)
+	if err != nil {
+		Log.Error("/sync/from_server/count", "error", err)
+		httpError(w, err)
+		return
+	}
+
+	j, _ := json.Marshal(struct {
+		OK    bool
+		Count int
+	}{
+		true,
+		count,
+	})
+	w.Write(j)
+} // }}}
 func actionNodeRetrieve(w http.ResponseWriter, r *http.Request) { // {{{
 	user := getUser(r)
 	var err error
@@ -290,7 +314,7 @@ func actionSyncToServer(w http.ResponseWriter, r *http.Request) { // {{{
 
 	body, _ := io.ReadAll(r.Body)
 	var request struct {
-		NodeData   string
+		NodeData string
 	}
 	err := json.Unmarshal(body, &request)
 	if err != nil {