Enable export and import of SDN configuration

resolves #269 (closed)

Related Issue

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

applications/venv-manager/venv-manager/venv-manager.go

@@ -8,6 +8,7 @@ import (
 	"strings"
 	"time"
 
+	configMgmtPb "code.fbi.h-da.de/danet/gosdn/api/go/gosdn/configurationmanagement"
 	corePb "code.fbi.h-da.de/danet/gosdn/api/go/gosdn/core"
 	networkelementPb "code.fbi.h-da.de/danet/gosdn/api/go/gosdn/networkelement"
 	pndPb "code.fbi.h-da.de/danet/gosdn/api/go/gosdn/pnd"
@@ -82,6 +83,45 @@ func (v *VenvManager) TestConnection() error {
 	return nil
 }
 
+// CreateTopologyFile creates the topology file.
+func (v *VenvManager) CreateSDNConfigFile() error {
+	sdnConfigReponse, err := v.getSDNConfigData()
+	if err != nil {
+		return err
+	}
+
+	fmt.Println(sdnConfigReponse)
+
+	return nil
+}
+
+func (v *VenvManager) getSDNConfigData() (*string, error) {
+	conn, err := v.createConnection()
+	if err != nil {
+		return nil, err
+	}
+	defer v.closeConnection(conn)
+
+	ctx := context.Background()
+
+	//get PND, might remove later because we won't support PND in the future
+	coreService := corePb.NewCoreServiceClient(conn)
+	pndRes, err := coreService.GetPndList(ctx, &corePb.GetPndListRequest{Timestamp: getTimestamp()})
+	if err != nil {
+		return nil, err
+	}
+	v.pnd = pndRes.Pnd[0].Id
+
+	configMgmtService := configMgmtPb.NewConfigurationManagementServiceClient(conn)
+
+	sdnConfigResponse, err := configMgmtService.ExportSDNConfig(ctx, &configMgmtPb.ExportSDNConfigRequest{Timestamp: getTimestamp(), Pid: v.pnd})
+	if err != nil {
+		return nil, err
+	}
+
+	return &sdnConfigResponse.SdnConfig, nil
+}
+
 // CreateTopologyFile creates the topology file.
 func (v *VenvManager) CreateTopologyFile() error {
 	topologyData, err := v.getTopologyData()