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.

controller/nucleus/southbound.go

@@ -2,6 +2,7 @@ package nucleus
 
 import (
 	"encoding/json"
+	"fmt"
 	"path/filepath"
 
 	"code.fbi.h-da.de/danet/gosdn/controller/customerrs"
@@ -153,6 +154,27 @@ func generateEmptyValidatedStructs(schema *ytypes.Schema, path *gpb.Path) (ygot.
 	return validatedDeepCopy, validatedCreatedNode, nil
 }
 
+func removeReadOnlyFields(validatedGoStruct ygot.ValidatedGoStruct, emptyValidatedGoStruct ygot.ValidatedGoStruct, schema *ytypes.Schema) error {
+	diff, err := ygot.Diff(emptyValidatedGoStruct, validatedGoStruct)
+	if err != nil {
+		return err
+	}
+	filteredUpdates := make([]*gpb.Update, 0)
+	for _, u := range diff.Update {
+		rootSchema := schema.RootSchema()
+		pathString, err := ygot.PathToString(u.GetPath())
+		if err != nil {
+			return err
+		}
+		entry := rootSchema.Find(pathString)
+		if !entry.ReadOnly() {
+			filteredUpdates = append(filteredUpdates, u)
+		}
+	}
+
+	return nil
+}
+
 // unmarshal parses a gNMI response to a go struct.
 func unmarshal(schema *ytypes.Schema, bytes []byte, path *gpb.Path, goStruct ygot.GoStruct, opt ...ytypes.UnmarshalOpt) error {
 	defer func() {
@@ -161,20 +183,31 @@ func unmarshal(schema *ytypes.Schema, bytes []byte, path *gpb.Path, goStruct ygo
 		}
 	}()
 
-	validatedDeepCopy, emptyValidatedCreatedNode, err := generateEmptyValidatedStructs(schema, path)
+    ygot
+	validatedDeepCopy, validatedCreatedNode, err := generateEmptyValidatedStructs(schema, path)
 	if err != nil {
 		return err
 	}
 
-	_, emptyValidatedCreatedNodeForDiff, err := generateEmptyValidatedStructs(schema, path)
+	validatedDeepCopyForDiff, validatedCreatedNodeForDiff, err := generateEmptyValidatedStructs(schema, path)
 	if err != nil {
 		return err
 	}
 
-	if err := openconfig.Unmarshal(bytes, emptyValidatedCreatedNode, opt...); err != nil {
+	fmt.Println(validatedDeepCopyForDiff)
+	fmt.Println(validatedCreatedNodeForDiff)
+
+	if err := openconfig.Unmarshal(bytes, validatedCreatedNode, opt...); err != nil {
 		return err
 	}
 
+    validatedCreatedNode.
+
+	//err = removeReadOnlyFields(validatedCreatedNode, validatedCreatedNodeForDiff, schema)
+	//if err != nil {
+	//	return err
+	//}
+
 	opts := []ygot.MergeOpt{&ygot.MergeOverwriteExistingFields{}}
 	return ygot.MergeStructInto(goStruct, validatedDeepCopy, opts...)
 }