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/*
* 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 (
"bytes"
"crypto/md5"
"fmt"
"github.com/golang/protobuf/proto"
"github.com/opencord/voltha-go/common/log"
"github.com/opencord/voltha-go/db/kvstore"
"reflect"
"sort"
"sync"
)
// TODO: Cache logic will have to be revisited to cleanup unused entries in memory (disabled for now)
//
type revCacheSingleton struct {
sync.RWMutex
Cache sync.Map
}
var revCacheInstance *revCacheSingleton
var revCacheOnce sync.Once
func GetRevCache() *revCacheSingleton {
revCacheOnce.Do(func() {
revCacheInstance = &revCacheSingleton{Cache: sync.Map{}}
})
return revCacheInstance
}
type NonPersistedRevision struct {
mutex sync.RWMutex
Root *root
Config *DataRevision
childrenLock sync.RWMutex
Children map[string][]Revision
Hash string
Branch *Branch
WeakRef string
Name string
discarded bool
}
func NewNonPersistedRevision(root *root, branch *Branch, data interface{}, children map[string][]Revision) Revision {
r := &NonPersistedRevision{}
r.Root = root
r.Branch = branch
r.Config = NewDataRevision(root, data)
r.Children = children
r.Hash = r.hashContent()
r.discarded = false
return r
}
func (npr *NonPersistedRevision) IsDiscarded() bool {
return npr.discarded
}
func (npr *NonPersistedRevision) SetConfig(config *DataRevision) {
npr.mutex.Lock()
defer npr.mutex.Unlock()
npr.Config = config
}
func (npr *NonPersistedRevision) GetConfig() *DataRevision {
npr.mutex.Lock()
defer npr.mutex.Unlock()
return npr.Config
}
func (npr *NonPersistedRevision) SetAllChildren(children map[string][]Revision) {
npr.childrenLock.Lock()
defer npr.childrenLock.Unlock()
npr.Children = make(map[string][]Revision)
for key, value := range children {
npr.Children[key] = make([]Revision, len(value))
copy(npr.Children[key], value)
}
}
func (npr *NonPersistedRevision) SetChildren(name string, children []Revision) {
npr.childrenLock.Lock()
defer npr.childrenLock.Unlock()
npr.Children[name] = make([]Revision, len(children))
copy(npr.Children[name], children)
}
func (npr *NonPersistedRevision) GetAllChildren() map[string][]Revision {
npr.childrenLock.Lock()
defer npr.childrenLock.Unlock()
return npr.Children
}
func (npr *NonPersistedRevision) GetChildren(name string) []Revision {
npr.childrenLock.Lock()
defer npr.childrenLock.Unlock()
if _, exists := npr.Children[name]; exists {
return npr.Children[name]
}
return nil
}
func (npr *NonPersistedRevision) SetHash(hash string) {
npr.mutex.Lock()
defer npr.mutex.Unlock()
npr.Hash = hash
}
func (npr *NonPersistedRevision) GetHash() string {
//npr.mutex.Lock()
//defer npr.mutex.Unlock()
return npr.Hash
}
func (npr *NonPersistedRevision) ClearHash() {
npr.mutex.Lock()
defer npr.mutex.Unlock()
npr.Hash = ""
}
func (npr *NonPersistedRevision) GetName() string {
//npr.mutex.Lock()
//defer npr.mutex.Unlock()
return npr.Name
}
func (npr *NonPersistedRevision) SetName(name string) {
//npr.mutex.Lock()
//defer npr.mutex.Unlock()
npr.Name = name
}
func (npr *NonPersistedRevision) SetBranch(branch *Branch) {
npr.mutex.Lock()
defer npr.mutex.Unlock()
npr.Branch = branch
}
func (npr *NonPersistedRevision) GetBranch() *Branch {
npr.mutex.Lock()
defer npr.mutex.Unlock()
return npr.Branch
}
func (npr *NonPersistedRevision) GetData() interface{} {
npr.mutex.Lock()
defer npr.mutex.Unlock()
if npr.Config == nil {
return nil
}
return npr.Config.Data
}
func (npr *NonPersistedRevision) GetNode() *node {
npr.mutex.Lock()
defer npr.mutex.Unlock()
return npr.Branch.Node
}
func (npr *NonPersistedRevision) Finalize(skipOnExist bool) {
npr.Hash = npr.hashContent()
}
// hashContent generates a hash string based on the contents of the revision.
// The string should be unique to avoid conflicts with other revisions
func (npr *NonPersistedRevision) hashContent() string {
var buffer bytes.Buffer
var childrenKeys []string
if npr.Config != nil {
buffer.WriteString(npr.Config.Hash)
}
if npr.Name != "" {
buffer.WriteString(npr.Name)
}
for key := range npr.Children {
childrenKeys = append(childrenKeys, key)
}
sort.Strings(childrenKeys)
if len(npr.Children) > 0 {
// Loop through sorted Children keys
for _, key := range childrenKeys {
for _, child := range npr.Children[key] {
if child != nil && child.GetHash() != "" {
buffer.WriteString(child.GetHash())
}
}
}
}
return fmt.Sprintf("%x", md5.Sum(buffer.Bytes()))[:12]
}
// Get will retrieve the data for the current revision
func (npr *NonPersistedRevision) Get(depth int) interface{} {
// 1. Clone the data to avoid any concurrent access issues
// 2. The current rev might still be pointing to an old config
// thus, force the revision to get its latest value
latestRev := npr.GetBranch().GetLatest()
originalData := proto.Clone(latestRev.GetData().(proto.Message))
data := originalData
if depth != 0 {
// FIXME: Traversing the struct through reflection sometimes corrupts the data.
// Unlike the original python implementation, golang structs are not lazy loaded.
// Keeping this non-critical logic for now, but Get operations should be forced to
// depth=0 to avoid going through the following loop.
for fieldName, field := range ChildrenFields(latestRev.GetData()) {
childDataName, childDataHolder := GetAttributeValue(data, fieldName, 0)
if field.IsContainer {
for _, rev := range latestRev.GetChildren(fieldName) {
childData := rev.Get(depth - 1)
foundEntry := false
for i := 0; i < childDataHolder.Len(); i++ {
cdh_if := childDataHolder.Index(i).Interface()
if cdh_if.(proto.Message).String() == childData.(proto.Message).String() {
foundEntry = true
break
}
}
if !foundEntry {
// avoid duplicates by adding it only if the child was not found in the holder
childDataHolder = reflect.Append(childDataHolder, reflect.ValueOf(childData))
}
}
} else {
if revs := npr.GetBranch().GetLatest().GetChildren(fieldName); revs != nil && len(revs) > 0 {
rev := revs[0]
if rev != nil {
childData := rev.Get(depth - 1)
if reflect.TypeOf(childData) == reflect.TypeOf(childDataHolder.Interface()) {
childDataHolder = reflect.ValueOf(childData)
}
}
}
}
// Merge child data with cloned object
reflect.ValueOf(data).Elem().FieldByName(childDataName).Set(childDataHolder)
}
}
result := data
if result != nil {
// We need to send back a copy of the retrieved object
result = proto.Clone(data.(proto.Message))
}
return result
}
// UpdateData will refresh the data content of the revision
func (npr *NonPersistedRevision) UpdateData(data interface{}, branch *Branch) Revision {
npr.mutex.Lock()
defer npr.mutex.Unlock()
// Do not update the revision if data is the same
if npr.Config.Data != nil && npr.Config.hashData(npr.Root, data) == npr.Config.Hash {
log.Debugw("stored-data-matches-latest", log.Fields{"stored": npr.Config.Data, "provided": data})
return npr
}
// Construct a new revision based on the current one
newRev := NonPersistedRevision{}
newRev.Config = NewDataRevision(npr.Root, data)
newRev.Hash = npr.Hash
newRev.Root = npr.Root
newRev.Name = npr.Name
newRev.Branch = branch
newRev.Children = make(map[string][]Revision)
for entryName, childrenEntry := range branch.GetLatest().GetAllChildren() {
newRev.Children[entryName] = append(newRev.Children[entryName], childrenEntry...)
}
newRev.Finalize(false)
return &newRev
}
// UpdateChildren will refresh the list of children with the provided ones
// It will carefully go through the list and ensure that no child is lost
func (npr *NonPersistedRevision) UpdateChildren(name string, children []Revision, branch *Branch) Revision {
npr.mutex.Lock()
defer npr.mutex.Unlock()
// Construct a new revision based on the current one
updatedRev := &NonPersistedRevision{}
updatedRev.Config = NewDataRevision(npr.Root, npr.Config.Data)
updatedRev.Hash = npr.Hash
updatedRev.Branch = branch
updatedRev.Name = npr.Name
updatedRev.Children = make(map[string][]Revision)
for entryName, childrenEntry := range branch.GetLatest().GetAllChildren() {
updatedRev.Children[entryName] = append(updatedRev.Children[entryName], childrenEntry...)
}
var updatedChildren []Revision
// Verify if the map contains already contains an entry matching the name value
// If so, we need to retain the contents of that entry and merge them with the provided children revision list
if existingChildren := branch.GetLatest().GetChildren(name); existingChildren != nil {
// Construct a map of unique child names with the respective index value
// for the children in the existing revision as well as the new ones
existingNames := make(map[string]int)
newNames := make(map[string]int)
for i, newChild := range children {
newNames[newChild.GetName()] = i
}
for i, existingChild := range existingChildren {
existingNames[existingChild.GetName()] = i
// If an existing entry is not in the new list, add it to the updated list, so it is not forgotten
if _, exists := newNames[existingChild.GetName()]; !exists {
updatedChildren = append(updatedChildren, existingChild)
}
}
log.Debugw("existing-children-names", log.Fields{"hash": npr.GetHash(), "names": existingNames})
// Merge existing and new children
for _, newChild := range children {
nameIndex, nameExists := existingNames[newChild.GetName()]
// Does the existing list contain a child with that name?
if nameExists {
// Check if the data has changed or not
if existingChildren[nameIndex].GetData().(proto.Message).String() != newChild.GetData().(proto.Message).String() {
// replace entry
newChild.GetNode().Root = existingChildren[nameIndex].GetNode().Root
updatedChildren = append(updatedChildren, newChild)
} else {
// keep existing entry
updatedChildren = append(updatedChildren, existingChildren[nameIndex])
}
} else {
// new entry ... just add it
updatedChildren = append(updatedChildren, newChild)
}
}
// Save children in new revision
updatedRev.SetChildren(name, updatedChildren)
updatedNames := make(map[string]int)
for i, updatedChild := range updatedChildren {
updatedNames[updatedChild.GetName()] = i
}
log.Debugw("updated-children-names", log.Fields{"hash": npr.GetHash(), "names": updatedNames})
} else {
// There are no children available, just save the provided ones
updatedRev.SetChildren(name, children)
}
updatedRev.Finalize(false)
return updatedRev
}
// UpdateAllChildren will replace the current list of children with the provided ones
func (npr *NonPersistedRevision) UpdateAllChildren(children map[string][]Revision, branch *Branch) Revision {
npr.mutex.Lock()
defer npr.mutex.Unlock()
newRev := npr
newRev.Config = npr.Config
newRev.Hash = npr.Hash
newRev.Branch = branch
newRev.Name = npr.Name
newRev.Children = make(map[string][]Revision)
for entryName, childrenEntry := range children {
newRev.Children[entryName] = append(newRev.Children[entryName], childrenEntry...)
}
newRev.Finalize(false)
return newRev
}
// Drop is used to indicate when a revision is no longer required
func (npr *NonPersistedRevision) Drop(txid string, includeConfig bool) {
log.Debugw("dropping-revision", log.Fields{"hash": npr.GetHash(), "name": npr.GetName()})
npr.discarded = true
}
// ChildDrop will remove a child entry matching the provided parameters from the current revision
func (npr *NonPersistedRevision) ChildDrop(childType string, childHash string) {
if childType != "" {
children := make([]Revision, len(npr.GetChildren(childType)))
copy(children, npr.GetChildren(childType))
for i, child := range children {
if child.GetHash() == childHash {
children = append(children[:i], children[i+1:]...)
npr.SetChildren(childType, children)
break
}
}
}
}
func (npr *NonPersistedRevision) LoadFromPersistence(path string, txid string, blobs map[string]*kvstore.KVPair) []Revision {
// stub... required by interface
return nil
}
func (npr *NonPersistedRevision) SetupWatch(key string) {
// stub ... required by interface
}
func (pr *NonPersistedRevision) StorageDrop(txid string, includeConfig bool) {
// stub ... required by interface
}