| /* |
| * Copyright 2018-present Open Networking Foundation |
| |
| * 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 model |
| |
| import ( |
| desc "github.com/golang/protobuf/descriptor" |
| "github.com/golang/protobuf/proto" |
| "github.com/golang/protobuf/protoc-gen-go/descriptor" |
| "github.com/opencord/voltha-go/common/log" |
| "github.com/opencord/voltha-go/protos/common" |
| "reflect" |
| "strconv" |
| "sync" |
| ) |
| |
| type singletonChildTypeCache struct { |
| Cache map[interface{}]map[string]*ChildType |
| } |
| |
| var instanceChildTypeCache *singletonChildTypeCache |
| var onceChildTypeCache sync.Once |
| |
| func getChildTypeCache() *singletonChildTypeCache { |
| onceChildTypeCache.Do(func() { |
| instanceChildTypeCache = &singletonChildTypeCache{} |
| }) |
| return instanceChildTypeCache |
| } |
| |
| // ChildType structure contains construct details of an object |
| type ChildType struct { |
| ClassModule string |
| ClassType reflect.Type |
| IsContainer bool |
| Key string |
| KeyFromStr func(s string) interface{} |
| } |
| |
| // ChildrenFields retrieves list of child objects associated to a given interface |
| func ChildrenFields(cls interface{}) map[string]*ChildType { |
| if cls == nil { |
| return nil |
| } |
| var names map[string]*ChildType |
| var namesExist bool |
| |
| if getChildTypeCache().Cache == nil { |
| getChildTypeCache().Cache = make(map[interface{}]map[string]*ChildType) |
| } |
| |
| msgType := reflect.TypeOf(cls) |
| inst := getChildTypeCache() |
| |
| if names, namesExist = inst.Cache[msgType.String()]; !namesExist { |
| names = make(map[string]*ChildType) |
| |
| _, md := desc.ForMessage(cls.(desc.Message)) |
| |
| // TODO: Do we need to validate MD for nil, panic or exception? |
| for _, field := range md.Field { |
| if options := field.GetOptions(); options != nil { |
| if proto.HasExtension(options, common.E_ChildNode) { |
| isContainer := *field.Label == descriptor.FieldDescriptorProto_LABEL_REPEATED |
| meta, _ := proto.GetExtension(options, common.E_ChildNode) |
| |
| var keyFromStr func(string) interface{} |
| var ct ChildType |
| |
| parentType := FindOwnerType(reflect.ValueOf(cls), field.GetName(), 0, false) |
| if meta.(*common.ChildNode).GetKey() != "" { |
| keyType := FindKeyOwner(reflect.New(parentType).Elem().Interface(), meta.(*common.ChildNode).GetKey(), 0) |
| |
| switch keyType.(reflect.Type).Name() { |
| case "string": |
| keyFromStr = func(s string) interface{} { |
| return s |
| } |
| case "int32": |
| keyFromStr = func(s string) interface{} { |
| i, _ := strconv.Atoi(s) |
| return int32(i) |
| } |
| case "int64": |
| keyFromStr = func(s string) interface{} { |
| i, _ := strconv.Atoi(s) |
| return int64(i) |
| } |
| case "uint32": |
| keyFromStr = func(s string) interface{} { |
| i, _ := strconv.Atoi(s) |
| return uint32(i) |
| } |
| case "uint64": |
| keyFromStr = func(s string) interface{} { |
| i, _ := strconv.Atoi(s) |
| return uint64(i) |
| } |
| default: |
| log.Errorf("Key type not implemented - type: %s\n", keyType.(reflect.Type)) |
| } |
| } |
| |
| ct = ChildType{ |
| ClassModule: parentType.String(), |
| ClassType: parentType, |
| IsContainer: isContainer, |
| Key: meta.(*common.ChildNode).GetKey(), |
| KeyFromStr: keyFromStr, |
| } |
| |
| names[field.GetName()] = &ct |
| } |
| } |
| } |
| |
| getChildTypeCache().Cache[msgType.String()] = names |
| } else { |
| log.Debugf("Cache entry for %s: %+v", msgType.String(), inst.Cache[msgType.String()]) |
| } |
| |
| return names |
| } |