Add basic application framework and example application to show interaction between events an NBI

Depends on:

• !340 (merged)
• !344 (merged)
• !349 (merged)
• !342 (merged)

controller/nucleus/database/mongo-connection.go

@@ -5,7 +5,6 @@ import (
 	"log"
 	"time"
 
-	"code.fbi.h-da.de/danet/gosdn/controller/config"
 	"go.mongodb.org/mongo-driver/mongo"
 	"go.mongodb.org/mongo-driver/mongo/options"
 )
@@ -14,13 +13,14 @@ const (
 	// Timeout operations after N seconds
 	connectTimeout = 5
 	// DatabaseName is the name of the mongoDB database used.
-	DatabaseName = "gosdn"
-	//mongoConnection = "mongodb://root:example@localhost"
+	DatabaseName    = "gosdn"
+	mongoConnection = "mongodb://root:example@localhost:27017"
 )
 
 // GetMongoConnection Retrieves a client to the MongoDB
 func GetMongoConnection() (*mongo.Client, context.Context, context.CancelFunc) {
-	mongoConnection := config.DatabaseConnection
+    // TODO: Fix getting connection from config package
+	// mongoConnection := config.DatabaseConnection
 	client, err := mongo.NewClient(options.Client().ApplyURI(mongoConnection))
 	if err != nil {
 		log.Printf("Failed to create client: %v", err)