add app limit

src/qldb.go

@@ -630,6 +630,16 @@ func (dbobj dbcon) getAllTables() ([]string, error) {
 	return knownApps, nil
 }
 
+func (dbobj dbcon) validateNewApp(appName string) bool {
+	if contains(knownApps, appName) == true {
+		return true
+	}
+	if len(knownApps) >= 10 {
+		return false
+	}
+	return true
+}
+
 func (dbobj dbcon) indexNewApp(appName string) {
 	if contains(knownApps, appName) == false {
 		// it is a new app, create an index

src/userapps_api.go

@@ -24,6 +24,10 @@ func (e mainEnv) userappNew(w http.ResponseWriter, r *http.Request, ps httproute
 		returnError(w, r, "bad appname", 405, nil, event)
 		return
 	}
+	if e.db.validateNewApp("app_"+appName) == false {
+		returnError(w, r, "db limitation", 405, nil, event)
+		return
+	}
 
 	data, err := getJSONPostData(r)
 	if err != nil {