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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 (
"fmt"
"github.com/golang/protobuf/proto"
"github.com/opencord/voltha-go/common/log"
"reflect"
"strings"
)
const (
NONE string = "none"
)
type Node struct {
root *Root
Type interface{}
Branches map[string]*Branch
Tags map[string]Revision
Proxy *Proxy
EventBus *EventBus
AutoPrune bool
}
type ChangeTuple struct {
Type CallbackType
Data interface{}
}
func NewNode(root *Root, initialData interface{}, autoPrune bool, txid string) *Node {
n := &Node{}
n.root = root
n.Branches = make(map[string]*Branch)
n.Tags = make(map[string]Revision)
n.Proxy = nil
n.EventBus = nil
n.AutoPrune = autoPrune
if IsProtoMessage(initialData) {
n.Type = reflect.ValueOf(initialData).Interface()
dataCopy := proto.Clone(initialData.(proto.Message))
n.initialize(dataCopy, txid)
} else if reflect.ValueOf(initialData).IsValid() {
n.Type = reflect.ValueOf(initialData).Interface()
} else {
// not implemented error
fmt.Errorf("cannot process initial data - %+v", initialData)
}
return n
}
func (n *Node) MakeNode(data interface{}, txid string) *Node {
return NewNode(n.root, data, true, txid)
}
func (n *Node) MakeRevision(branch *Branch, data interface{}, children map[string][]Revision) Revision {
return n.root.MakeRevision(branch, data, children)
}
func (n *Node) MakeLatest(branch *Branch, revision Revision, changeAnnouncement []ChangeTuple) {
if _, ok := branch.Revisions[revision.GetHash()]; !ok {
branch.Revisions[revision.GetHash()] = revision
}
if branch.Latest == nil || revision.GetHash() != branch.Latest.GetHash() {
branch.Latest = revision
}
if changeAnnouncement != nil && branch.Txid == "" {
if n.Proxy != nil {
for _, change := range changeAnnouncement {
// TODO: Invoke callback
fmt.Printf("invoking callback - changeType: %+v, data:%+v\n", change.Type, change.Data)
n.root.addCallback(n.Proxy.InvokeCallbacks, change.Type, change.Data, true)
}
}
for _, change := range changeAnnouncement {
// TODO: send notifications
fmt.Printf("sending notification - changeType: %+v, data:%+v\n", change.Type, change.Data)
n.root.addNotificationCallback(n.makeEventBus().Advertise, change.Type, change.Data, revision.GetHash())
}
}
}
func (n *Node) Latest() Revision {
if branch, exists := n.Branches[NONE]; exists {
return branch.Latest
}
return nil
}
func (n *Node) GetHash(hash string) Revision {
return n.Branches[NONE].Revisions[hash]
}
func (n *Node) initialize(data interface{}, txid string) {
var children map[string][]Revision
children = make(map[string][]Revision)
for fieldName, field := range ChildrenFields(n.Type) {
_, fieldValue := GetAttributeValue(data, fieldName, 0)
if fieldValue.IsValid() {
if field.IsContainer {
if field.Key != "" {
var keysSeen []string
for i := 0; i < fieldValue.Len(); i++ {
v := fieldValue.Index(i)
rev := n.MakeNode(v.Interface(), txid).Latest()
_, key := GetAttributeValue(v.Interface(), field.Key, 0)
for _, k := range keysSeen {
if k == key.String() {
fmt.Errorf("duplicate key - %s", k)
}
}
children[fieldName] = append(children[fieldName], rev)
keysSeen = append(keysSeen, key.String())
}
} else {
for i := 0; i < fieldValue.Len(); i++ {
v := fieldValue.Index(i)
children[fieldName] = append(children[fieldName], n.MakeNode(v.Interface(), txid).Latest())
}
}
} else {
children[fieldName] = append(children[fieldName], n.MakeNode(fieldValue.Interface(), txid).Latest())
}
} else {
fmt.Errorf("field is invalid - %+v", fieldValue)
}
}
// FIXME: ClearField??? No such method in go protos. Reset?
//data.ClearField(field_name)
branch := NewBranch(n, "", nil, n.AutoPrune)
rev := n.MakeRevision(branch, data, children)
n.MakeLatest(branch, rev, nil)
if txid == "" {
n.Branches[NONE] = branch
} else {
n.Branches[txid] = branch
}
}
//
// Get operation
//
func (n *Node) Get(path string, hash string, depth int, deep bool, txid string) interface{} {
if deep {
depth = -1
}
for strings.HasPrefix(path, "/") {
path = path[1:]
}
var branch *Branch
var rev Revision
// FIXME: should empty txid be cleaned up?
if branch = n.Branches[txid]; txid == "" || branch == nil {
branch = n.Branches[NONE]
}
if hash != "" {
rev = branch.Revisions[hash]
} else {
rev = branch.Latest
}
return n.get(rev, path, depth)
}
func (n *Node) findRevByKey(revs []Revision, keyName string, value string) (int, Revision) {
for i, rev := range revs {
dataValue := reflect.ValueOf(rev.GetData())
dataStruct := GetAttributeStructure(rev.GetData(), keyName, 0)
fieldValue := dataValue.Elem().FieldByName(dataStruct.Name)
if fieldValue.Interface().(string) == value {
return i, rev
}
}
fmt.Errorf("key %s=%s not found", keyName, value)
return -1, nil
}
func (n *Node) get(rev Revision, path string, depth int) interface{} {
if path == "" {
return n.doGet(rev, depth)
}
partition := strings.SplitN(path, "/", 2)
name := partition[0]
if len(partition) < 2 {
path = ""
} else {
path = partition[1]
}
names := ChildrenFields(n.Type)
field := names[name]
if field != nil && field.IsContainer {
if field.Key != "" {
children := rev.GetChildren()[name]
if path != "" {
partition = strings.SplitN(path, "/", 2)
key := partition[0]
path = ""
key = field.KeyFromStr(key).(string)
if _, childRev := n.findRevByKey(children, field.Key, key); childRev == nil {
return nil
} else {
childNode := childRev.GetNode()
return childNode.get(childRev, path, depth)
}
} else {
var response []interface{}
for _, childRev := range children {
childNode := childRev.GetNode()
value := childNode.doGet(childRev, depth)
response = append(response, value)
}
return response
}
} else {
var response []interface{}
if path != "" {
// TODO: raise error
return response
}
for _, childRev := range rev.GetChildren()[name] {
childNode := childRev.GetNode()
value := childNode.doGet(childRev, depth)
response = append(response, value)
}
return response
}
} else {
c1 := rev.GetChildren()[name]
childRev := c1[0]
childNode := childRev.GetNode()
return childNode.get(childRev, path, depth)
}
return nil
}
func (n *Node) doGet(rev Revision, depth int) interface{} {
msg := rev.Get(depth)
if n.Proxy != nil {
log.Debug("invoking proxy GET Callbacks")
msg = n.Proxy.InvokeCallbacks(GET, msg, false)
}
return msg
}
//
// Update operation
//
func (n *Node) Update(path string, data interface{}, strict bool, txid string, makeBranch t_makeBranch) Revision {
// FIXME: is this required ... a bit overkill to take out a "/"
for strings.HasPrefix(path, "/") {
path = path[1:]
}
var branch *Branch
var ok bool
if txid == "" {
branch = n.Branches[NONE]
} else if branch, ok = n.Branches[txid]; !ok {
branch = makeBranch(n)
}
log.Debugf("Branch data : %+v, Passed data: %+v", branch.Latest.GetData(), data)
if path == "" {
return n.doUpdate(branch, data, strict)
}
// TODO missing some code here...
rev := branch.Latest
partition := strings.SplitN(path, "/", 2)
name := partition[0]
if len(partition) < 2 {
path = ""
} else {
path = partition[1]
}
field := ChildrenFields(n.Type)[name]
var children []Revision
if field.IsContainer {
if path == "" {
fmt.Errorf("cannot update a list\n")
} else if field.Key != "" {
partition := strings.SplitN(path, "/", 2)
key := partition[0]
if len(partition) < 2 {
path = ""
} else {
path = partition[1]
}
key = field.KeyFromStr(key).(string)
// TODO. Est-ce que le copy ne fonctionne pas? dois-je plutôt faire un clone de chaque item?
for _, v := range rev.GetChildren()[name] {
revCopy := reflect.ValueOf(v).Interface().(Revision)
children = append(children, revCopy)
}
idx, childRev := n.findRevByKey(children, field.Key, key)
childNode := childRev.GetNode()
newChildRev := childNode.Update(path, data, strict, txid, makeBranch)
if newChildRev.GetHash() == childRev.GetHash() {
if newChildRev != childRev {
log.Debug("clear-hash - %s %+v", newChildRev.GetHash(), newChildRev)
newChildRev.ClearHash()
}
return branch.Latest
}
if _, newKey := GetAttributeValue(newChildRev.GetData(), field.Key, 0); newKey.Interface().(string) != key {
fmt.Errorf("cannot change key field\n")
}
children[idx] = newChildRev
rev = rev.UpdateChildren(name, children, branch)
n.root.MakeLatest(branch, rev, nil)
return rev
} else {
fmt.Errorf("cannot index into container with no keys\n")
}
} else {
childRev := rev.GetChildren()[name][0]
childNode := childRev.GetNode()
newChildRev := childNode.Update(path, data, strict, txid, makeBranch)
rev = rev.UpdateChildren(name, []Revision{newChildRev}, branch)
n.root.MakeLatest(branch, rev, nil)
return rev
}
return nil
}
func (n *Node) doUpdate(branch *Branch, data interface{}, strict bool) Revision {
log.Debugf("Comparing types - expected: %+v, actual: %+v", reflect.ValueOf(n.Type).Type(), reflect.TypeOf(data))
if reflect.TypeOf(data) != reflect.ValueOf(n.Type).Type() {
// TODO raise error
fmt.Errorf("data does not match type: %+v", n.Type)
return nil
}
// TODO: validate that this actually works
//if n.hasChildren(data) {
// return nil
//}
if n.Proxy != nil {
log.Debug("invoking proxy PRE_UPDATE Callbacks")
n.Proxy.InvokeCallbacks(PRE_UPDATE, data, false)
}
if !reflect.DeepEqual(branch.Latest.GetData(), data) {
if strict {
// TODO: checkAccessViolations(data, Branch.GetLatest.data)
fmt.Println("checking access violations")
}
rev := branch.Latest.UpdateData(data, branch)
n.root.MakeLatest(branch, rev, nil) // TODO -> changeAnnouncement needs to be a tuple (CallbackType.
// POST_UPDATE, rev.data)
return rev
} else {
return branch.Latest
}
}
//
// Add operation
//
func (n *Node) Add(path string, data interface{}, txid string, makeBranch t_makeBranch) Revision {
for strings.HasPrefix(path, "/") {
path = path[1:]
}
if path == "" {
// TODO raise error
fmt.Errorf("cannot add for non-container mode\n")
}
var branch *Branch
var ok bool
if txid == "" {
branch = n.Branches[NONE]
} else if branch, ok = n.Branches[txid]; !ok {
branch = makeBranch(n)
}
rev := branch.Latest
partition := strings.SplitN(path, "/", 2)
name := partition[0]
if len(partition) < 2 {
path = ""
} else {
path = partition[1]
}
field := ChildrenFields(n.Type)[name]
var children []Revision
if field.IsContainer {
if path == "" {
if field.Key != "" {
if n.Proxy != nil {
log.Debug("invoking proxy PRE_ADD Callbacks")
n.Proxy.InvokeCallbacks(PRE_ADD, data, false)
}
for _, v := range rev.GetChildren()[name] {
revCopy := reflect.ValueOf(v).Interface().(Revision)
children = append(children, revCopy)
}
_, key := GetAttributeValue(data, field.Key, 0)
if _, rev := n.findRevByKey(children, field.Key, key.String()); rev != nil {
// TODO raise error
fmt.Errorf("duplicate key found: %s", key.String())
}
childRev := n.MakeNode(data, "").Latest()
children = append(children, childRev)
rev := rev.UpdateChildren(name, children, branch)
n.root.MakeLatest(branch, rev, nil) // TODO -> changeAnnouncement needs to be a tuple (CallbackType.
// POST_ADD, rev.data)
return rev
} else {
fmt.Errorf("cannot add to non-keyed container\n")
}
} else if field.Key != "" {
partition := strings.SplitN(path, "/", 2)
key := partition[0]
if len(partition) < 2 {
path = ""
} else {
path = partition[1]
}
key = field.KeyFromStr(key).(string)
copy(children, rev.GetChildren()[name])
idx, childRev := n.findRevByKey(children, field.Key, key)
childNode := childRev.GetNode()
newChildRev := childNode.Add(path, data, txid, makeBranch)
children[idx] = newChildRev
rev := rev.UpdateChildren(name, children, branch)
n.root.MakeLatest(branch, rev, nil)
return rev
} else {
fmt.Errorf("cannot add to non-keyed container\n")
}
} else {
fmt.Errorf("cannot add to non-container field\n")
}
return nil
}
//
// Remove operation
//
func (n *Node) Remove(path string, txid string, makeBranch t_makeBranch) Revision {
for strings.HasPrefix(path, "/") {
path = path[1:]
}
if path == "" {
// TODO raise error
fmt.Errorf("cannot remove for non-container mode\n")
}
var branch *Branch
var ok bool
if txid == "" {
branch = n.Branches[NONE]
} else if branch, ok = n.Branches[txid]; !ok {
branch = makeBranch(n)
}
rev := branch.Latest
partition := strings.SplitN(path, "/", 2)
name := partition[0]
if len(partition) < 2 {
path = ""
} else {
path = partition[1]
}
field := ChildrenFields(n.Type)[name]
var children []Revision
postAnnouncement := []ChangeTuple{}
if field.IsContainer {
if path == "" {
fmt.Errorf("cannot remove without a key\n")
} else if field.Key != "" {
partition := strings.SplitN(path, "/", 2)
key := partition[0]
if len(partition) < 2 {
path = ""
} else {
path = partition[1]
}
key = field.KeyFromStr(key).(string)
if path != "" {
for _, v := range rev.GetChildren()[name] {
newV := reflect.ValueOf(v).Interface().(Revision)
children = append(children, newV)
}
idx, childRev := n.findRevByKey(children, field.Key, key)
childNode := childRev.GetNode()
newChildRev := childNode.Remove(path, txid, makeBranch)
children[idx] = newChildRev
rev := rev.UpdateChildren(name, children, branch)
n.root.MakeLatest(branch, rev, nil)
return rev
} else {
for _, v := range rev.GetChildren()[name] {
newV := reflect.ValueOf(v).Interface().(Revision)
children = append(children, newV)
}
idx, childRev := n.findRevByKey(children, field.Key, key)
if n.Proxy != nil {
data := childRev.GetData()
n.Proxy.InvokeCallbacks(PRE_REMOVE, data, false)
postAnnouncement = append(postAnnouncement, ChangeTuple{POST_REMOVE, data})
} else {
postAnnouncement = append(postAnnouncement, ChangeTuple{POST_REMOVE, childRev.GetData()})
}
children = append(children[:idx], children[idx+1:]...)
rev := rev.UpdateChildren(name, children, branch)
n.root.MakeLatest(branch, rev, postAnnouncement)
return rev
}
} else {
fmt.Errorf("cannot add to non-keyed container\n")
}
} else {
fmt.Errorf("cannot add to non-container field\n")
}
return nil
}
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Branching ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
type t_makeBranch func(*Node) *Branch
func (n *Node) makeTxBranch(txid string) *Branch {
branchPoint := n.Branches[NONE].Latest
branch := NewBranch(n, txid, branchPoint, true)
n.Branches[txid] = branch
return branch
}
func (n *Node) deleteTxBranch(txid string) {
delete(n.Branches, txid)
}
func (n *Node) mergeChild(txid string, dryRun bool) func(Revision) Revision {
f := func(rev Revision) Revision {
childBranch := rev.GetBranch()
if childBranch.Txid == txid {
rev = childBranch.Node.mergeTxBranch(txid, dryRun)
}
return rev
}
return f
}
func (n *Node) mergeTxBranch(txid string, dryRun bool) Revision {
srcBranch := n.Branches[txid]
dstBranch := n.Branches[NONE]
forkRev := srcBranch.Origin
srcRev := srcBranch.Latest
dstRev := dstBranch.Latest
rev, changes := Merge3Way(forkRev, srcRev, dstRev, n.mergeChild(txid, dryRun), dryRun)
if !dryRun {
n.root.MakeLatest(dstBranch, rev, changes)
delete(n.Branches, txid)
}
return rev
}
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Diff utility ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//func (n *Node) diff(hash1, hash2, txid string) {
// branch := n.Branches[txid]
// rev1 := branch.get(hash1)
// rev2 := branch.get(hash2)
//
// if rev1.GetHash() == rev2.GetHash() {
// // empty patch
// } else {
// // translate data to json and generate patch
// patch, err := jsonpatch.MakePatch(rev1.GetData(), rev2.GetData())
// patch.
// }
//}
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Tag utility ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// TODO: is tag mgmt used in the python implementation? Need to validate
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Internals ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
func (n *Node) hasChildren(data interface{}) bool {
for fieldName, field := range ChildrenFields(n.Type) {
_, fieldValue := GetAttributeValue(data, fieldName, 0)
if (field.IsContainer && fieldValue.Len() > 0) || !fieldValue.IsNil() {
log.Error("cannot update external children")
return true
}
}
return false
}
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Node Proxy ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
func (n *Node) GetProxy(path string, exclusive bool) *Proxy {
return n.getProxy(path, n.root, path, exclusive)
}
func (n *Node) getProxy(path string, root *Root, fullPath string, exclusive bool) *Proxy {
for strings.HasPrefix(path, "/") {
path = path[1:]
}
if path == "" {
return n.makeProxy(n.root, path, exclusive)
}
rev := n.Branches[NONE].Latest
partition := strings.SplitN(path, "/", 2)
name := partition[0]
path = partition[1]
field := ChildrenFields(n.Type)[name]
if field.IsContainer {
if path == "" {
log.Error("cannot proxy a container field")
}
if field.Key != "" {
partition := strings.SplitN(path, "/", 2)
key := partition[0]
path = partition[1]
key = field.KeyFromStr(key).(string)
children := rev.GetChildren()[name]
_, childRev := n.findRevByKey(children, field.Key, key)
childNode := childRev.GetNode()
return childNode.getProxy(path, root, fullPath, exclusive)
}
log.Error("cannot index into container with no keys")
} else {
childRev := rev.GetChildren()[name][0]
childNode := childRev.GetNode()
return childNode.getProxy(path, root, fullPath, exclusive)
}
return nil
}
func (n *Node) makeProxy(root *Root, fullPath string, exclusive bool) *Proxy {
if n.Proxy == nil {
n.Proxy = NewProxy(root, n, fullPath, exclusive)
} else {
if n.Proxy.Exclusive {
log.Error("node is already owned exclusively")
}
}
return n.Proxy
}
func (n *Node) makeEventBus() *EventBus {
if n.EventBus == nil {
n.EventBus = NewEventBus()
}
return n.EventBus
}
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Persistence Loading ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
func (n *Node) LoadLatest(kvStore *Backend, hash string) {
branch := NewBranch(n, "", nil, n.AutoPrune)
pr := &PersistedRevision{}
rev := pr.Load(branch, kvStore, n.Type, hash)
n.MakeLatest(branch, rev, nil)
n.Branches[NONE] = branch
}