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item.go
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item.go
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// Copyright (c) 2018 Cisco and/or its affiliates.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at:
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package models
import (
"fmt"
"reflect"
"github.com/gogo/protobuf/proto"
"github.com/gogo/protobuf/types"
"github.com/ligato/cn-infra/datasync"
api "github.com/ligato/vpp-agent/api/genericmanager"
)
// This constant is used as prefix for TypeUrl when marshalling to Any.
const ligatoModels = "models.ligato.io/"
// UnmarshalLazyValue is helper function for unmarshalling from datasync.LazyValue.
func UnmarshalLazyValue(key string, lazy datasync.LazyValue) (proto.Message, error) {
for _, model := range registeredModels {
if !model.IsKeyValid(key) {
continue
}
valueType := proto.MessageType(model.ProtoName())
if valueType == nil {
return nil, fmt.Errorf("unknown proto message defined for key %s", key)
}
value := reflect.New(valueType.Elem()).Interface().(proto.Message)
// try to deserialize the value
err := lazy.GetValue(value)
if err != nil {
return nil, err
}
return value, nil
}
return nil, fmt.Errorf("no model registered for key %s", key)
}
// Unmarshal is helper function for unmarshalling items.
func UnmarshalItem(m *api.Item) (proto.Message, error) {
protoName, err := types.AnyMessageName(m.GetData().GetAny())
if err != nil {
return nil, err
}
model, found := registeredModels[protoName]
if !found {
return nil, fmt.Errorf("message %s is not registered as model", protoName)
}
itemModel := m.Id.Model
if itemModel.Module != model.Module ||
itemModel.Version != model.Version ||
itemModel.Type != model.Type {
return nil, fmt.Errorf("item model does not match the one registered (%+v)", itemModel)
}
var any types.DynamicAny
if err := types.UnmarshalAny(m.GetData().GetAny(), &any); err != nil {
return nil, err
}
return any.Message, nil
}
// Marshal is helper function for marshalling items.
func MarshalItem(pb proto.Message) (*api.Item, error) {
id, err := getItemID(pb)
if err != nil {
return nil, err
}
any, err := types.MarshalAny(pb)
if err != nil {
return nil, err
}
any.TypeUrl = ligatoModels + proto.MessageName(pb)
/*name, err := model.nameFunc(pb)
if err != nil {
return nil, err
}
path := path.Join(model.Path(), name)*/
item := &api.Item{
/*Ref: &api.ItemRef{
Path: model.modelPath,
Name: name,
},*/
Id: id,
//Key: path,
Data: &api.Data{
Any: any,
},
}
return item, nil
}
func getItemID(pb proto.Message) (*api.Item_ID, error) {
protoName := proto.MessageName(pb)
model, found := registeredModels[protoName]
if !found {
return nil, fmt.Errorf("message %s is not registered as model", protoName)
}
name, err := model.name(pb)
if err != nil {
return nil, err
}
return &api.Item_ID{
Name: name,
Model: &api.Model{
Module: model.Module,
Version: model.Version,
Type: model.Type,
},
}, nil
}
type model interface {
GetModule() string
GetVersion() string
GetType() string
}
func getModelPath(m model) string {
return buildModelPath(m.GetVersion(), m.GetModule(), m.GetType())
}
// ModelForItem
func ModelForItem(item *api.Item) (registeredModel, error) {
if data := item.GetData(); data != nil {
return GetModel(data)
}
if id := item.GetId(); id != nil {
modelPath := getModelPath(id.Model)
protoName, found := modelPaths[modelPath]
if found {
model, _ := registeredModels[protoName]
return *model, nil
}
}
return registeredModel{}, fmt.Errorf("no model found for item %v", item)
}
func ItemKey(item *api.Item) (string, error) {
if data := item.GetData(); data != nil {
return GetKey(data)
}
if id := item.GetId(); id != nil {
modelPath := getModelPath(id.Model)
protoName, found := modelPaths[modelPath]
if found {
model, _ := registeredModels[protoName]
key := model.KeyPrefix() + id.Name
return key, nil
}
}
return "", fmt.Errorf("invalid item: %v", item)
}