it is possible to backup pnds into a json file

nucleus/cli-handling.go

@@ -166,6 +166,7 @@ func (s *server) CreatePND(ctx context.Context, in *pb.CreatePNDRequest) (*pb.Cr
 	id := uuid.New()
 	s.core.principalNetworkDomains[id] = NewPND(in.GetName(), in.GetDescription(), sbi)
 	//TODO: export
+	s.core.MarshallPNDs()
 
 	return &pb.CreatePNDReply{Message: "Created new PND: " + id.String()}, nil
 }
@@ -226,6 +227,7 @@ func (s *server) AddDevice(ctx context.Context, in *pb.AddDeviceRequest) (*pb.Ad
 	devicesMap := pnd.GetDevices()
 	devicesMap[newDevice.Uuid] = newDevice
 	//TODO: export
+	s.core.MarshallPNDs()
 
 	return &pb.AddDeviceReply{Message: "Added new Device: " + newDevice.Uuid.String()}, err
 }

nucleus/controller.go

 package nucleus
 
 import (
+	"encoding/json"
 	"fmt"
+	"io/ioutil"
 	"os"
 
 	"code.fbi.h-da.de/cocsn/gosdn/database"
@@ -43,12 +45,23 @@ func (c *Core) AttachDatabase() {
 	c.database = database.NewDatabaseClient()
 }
 
+func (c *Core) MarshallPNDs() error {
+	b, err := json.MarshalIndent(c.principalNetworkDomains, "", "\t")
+	if err != nil {
+		return err
+	}
+	err = ioutil.WriteFile("./backup.json", b, 0644)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
 // CreateSouthboundInterfaces initializes the controller with his SBIs
 func (c *Core) CreateSouthboundInterfaces() {
 	if len(c.southboundInterfaces) == 0 {
 		sbi := &AristaOC{}
-		t := &Gnmi{SetNode: sbi.SetNode()}
-		sbi.SetTransport(t)
+		sbi.SetDefaults()
 		c.southboundInterfaces[sbi.SbiIdentifier()] = sbi
 	}
 }

nucleus/device.go

@@ -6,11 +6,11 @@ import (
 )
 
 type Device struct {
-	Uuid      uuid.UUID
-	Device    ygot.GoStruct
-	SBI       SouthboundInterface
-	Config    DeviceConfig
-	Transport Transport
+	Uuid      uuid.UUID           `json:"id"`
+	Device    ygot.GoStruct       `json:"device"`
+	SBI       SouthboundInterface `json:"sbi"`
+	Config    DeviceConfig        `json:"config"`
+	Transport Transport           `json:"-"`
 }
 
 // Add adds a property to a device. Please

nucleus/principalNetworkDomain.go

@@ -19,10 +19,10 @@ type PrincipalNetworkDomain interface {
 }
 
 type pndImplementation struct {
-	Name        string
-	Description string
-	Sbi         map[string]SouthboundInterface
-	Devices     map[uuid.UUID]Device
+	Name        string                         `json:"name"`
+	Description string                         `json:"description"`
+	Sbi         map[string]SouthboundInterface `json:"sbis"`
+	Devices     map[uuid.UUID]Device           `json:"devices"`
 }
 
 //NewPND creates a Principle Network Domain

nucleus/southbound.go

@@ -15,6 +15,7 @@ type SouthboundInterface interface {
 	// Deprecated
 	SbiIdentifier() string
 
+	SetDefaults()
 	SetNode() func(schema *yang.Entry, root interface{}, path *gpb.Path, val interface{}, opts ...ytypes.SetNodeOpt) error
 	Schema() *ytypes.Schema
 	SetTransport(t Transport)
@@ -25,12 +26,17 @@ type Tapi struct {
 }
 
 type OpenConfig struct {
-	Transport Transport
+	Name      string    `json:"name"`
+	Transport Transport `json:"-"`
 	schema    *ytypes.Schema
 }
 
+func (oc *OpenConfig) SetDefaults() {
+	oc.Name = "openconfig"
+}
+
 func (oc *OpenConfig) SbiIdentifier() string {
-	return "openconfig"
+	return oc.Name
 }
 
 func (oc *OpenConfig) Schema() *ytypes.Schema {
@@ -59,12 +65,19 @@ func (oc *OpenConfig) SetTransport(t Transport) {
 }
 
 type AristaOC struct {
-	Transport Transport
+	Name      string    `json:"name"`
+	Transport Transport `json:"-"`
 	schema    *ytypes.Schema
 }
 
+func (oc *AristaOC) SetDefaults() {
+	oc.Name = "arista"
+	t := &Gnmi{SetNode: oc.SetNode()}
+	oc.Transport = t
+}
+
 func (oc *AristaOC) SbiIdentifier() string {
-	return "arista"
+	return oc.Name
 }
 
 func (oc *AristaOC) Schema() *ytypes.Schema {