pnds can be stored and loaded via gub

also added createPND for cli

configs/gosdn.toml

@@ -3,3 +3,4 @@ db.socket = "bolt://172.17.0.4:7687"
 db.user = ""
 db.password = ""
 db.crypto = false
+pnd.path = "./pnds.gob"

nucleus/cli-handling.go

@@ -152,3 +152,12 @@ func (s *server) TAPIGetLink(ctx context.Context, in *pb.TAPIRequest) (*pb.TAPIR
 	// TODO: Implement
 	return &pb.TAPIReply{Message: "Done"}, nil
 }
+
+func (s *server) CreatePND(ctx context.Context, in *pb.PNDRequest) (*pb.PNDReply, error) {
+	log.Info("Received: ", in.GetName())
+	path := viper.GetString("pnd.path")
+	//TODO: change sbi
+	s.core.principalNetworkDomains[uuid.New()] = NewPND(in.GetName(), in.GetDescription(), s.core.southboundInterfaces["test"])
+	s.core.savePNDs(path)
+	return &pb.PNDReply{Message: "Created new PND: " + in.GetName()}, nil
+}

nucleus/controller.go

 package nucleus
 
 import (
-	"code.fbi.h-da.de/cocsn/gosdn/database"
+	"encoding/gob"
 	"fmt"
+	"os"
+
+	"code.fbi.h-da.de/cocsn/gosdn/database"
 	"github.com/google/uuid"
 	log "github.com/sirupsen/logrus"
 	"github.com/spf13/viper"
-	"os"
 )
 
 // Core is the representation of the controllers core
 type Core struct {
-	southboundInterfaces   map[string]SouthboundInterface
-	prinipalNetworkDomains map[uuid.UUID]PrincipalNetworkDomain
-	database               database.Database
-	IsRunning              chan bool
+	southboundInterfaces    map[string]SouthboundInterface
+	principalNetworkDomains map[uuid.UUID]PrincipalNetworkDomain
+	database                database.Database
+	IsRunning               chan bool
 }
 
 //Initialize does start-up housekeeping like reading controller config files
@@ -31,16 +33,45 @@ func (c *Core) Initialize(IsRunningChannel chan bool) {
 	if err != nil {
 		log.Fatal(fmt.Errorf("Fatal error config file: %s \n", err))
 	}
+	path := viper.GetString("pnd.path")
+	gob.Register(&pndImplementation{})
 	c.AttachDatabase()
 
+	if err := c.loadPNDs(path); err != nil {
+		log.Info(err)
+	}
+
 	c.IsRunning = IsRunningChannel
 }
 
-// AttachDatabase connects to the database and passes the connectio to the controller core
+// AttachDatabase connects to the database and passes the connection to the controller core
 func (c *Core) AttachDatabase() {
 	c.database = database.NewDatabaseClient()
 }
 
+// TODO: the load and save functions for pnds are just temporary and should be
+//       moved to the database
+
+// SavePNDs imports the PNDs from last session
+func (c *Core) savePNDs(path string) error {
+	f, err := os.Create(path)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+	return gob.NewEncoder(f).Encode(c.principalNetworkDomains)
+}
+
+// loadPNDs imports the PNDs from last session
+func (c *Core) loadPNDs(path string) error {
+	f, err := os.Open(path)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+	return gob.NewDecoder(f).Decode(&c.principalNetworkDomains)
+}
+
 // Shutdown waits for the shutdown signal and gracefully shuts down once it arrived
 func (c *Core) Shutdown() {
 	<-c.IsRunning
@@ -52,4 +83,4 @@ func (c *Core) Shutdown() {
 	}
 	log.Info("Shutdown complete")
 	os.Exit(0)
-}
+}
\ No newline at end of file

nucleus/nucleus-core.go

 package nucleus
 
 import (
+	"time"
+
 	"code.fbi.h-da.de/cocsn/gosdn/database"
+	"github.com/google/uuid"
 	log "github.com/sirupsen/logrus"
-	"time"
 )
 
 //StartAndRun is used to start the core of the controller and any auxiliary services.
@@ -13,7 +15,9 @@ func StartAndRun(IsRunningChannel chan bool) {
 
 	// Initialize the Core
 	core := Core{
-		database: database.Database{},
+		principalNetworkDomains: make(map[uuid.UUID]PrincipalNetworkDomain),
+		southboundInterfaces:    make(map[string]SouthboundInterface),
+		database:                database.Database{},
 	}
 	core.Initialize(IsRunningChannel)
 	// Start the GRCP CLI