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config.go
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config.go
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package models
import (
"encoding/json"
"errors"
"reflect"
"time"
"github.com/imdario/mergo"
"github.com/pydio/cells/common/config/source"
)
var (
ErrDifferentArgumentsTypes = errors.New("src and dst must be of same type")
)
type Config source.ChangeSet
func (c *Config) Equals(o Differ) bool {
return false
}
func (c *Config) IsDeletable(m map[string]string) bool {
return false
}
// test if two user can be mergeable whose the same login name and auth source
func (c *Config) IsMergeable(o Differ) bool {
return true
}
func (c *Config) GetUniqueId() string {
return ""
}
func (c *Config) Merge(o Differ, options map[string]string) (Differ, error) {
new, err := merge((*source.ChangeSet)(o.(*Config)), (*source.ChangeSet)(c))
if err != nil {
return nil, err
}
return (*Config)(new), nil
}
func merge(changes ...*source.ChangeSet) (*source.ChangeSet, error) {
merged := make(map[string]interface{})
for _, m := range changes {
if m == nil {
continue
}
if len(m.Data) == 0 {
continue
}
var data map[string]interface{}
if err := json.Unmarshal(m.Data, &data); err != nil {
return nil, err
}
if err := mergo.Map(&merged, data); err != nil {
return nil, err
}
}
deepMerge(reflect.ValueOf(&merged))
b, err := json.Marshal(merged)
if err != nil {
return nil, err
}
cs := &source.ChangeSet{
Timestamp: time.Now(),
Data: b,
Source: "json",
}
return cs, nil
}
func mergeSlice(dst reflect.Value) (reflect.Value, error) {
elems := make(map[string][]reflect.Value)
for i := 0; i < dst.Len(); i++ {
found := false
elem := dst.Index(i)
id := ""
switch elem.Elem().Kind() {
case reflect.Map:
for _, key := range elem.Elem().MapKeys() {
if key.String() == "id" || key.String() == "Id" {
id = reflect.ValueOf(elem.Elem().MapIndex(key).Interface()).String()
found = true
}
}
if found {
elems[id] = append(elems[id], elem)
}
default:
return dst, nil
}
}
if len(elems) == 0 {
return dst, nil
}
var new []interface{}
for _, elemsToMerge := range elems {
val := make(map[string]interface{})
for _, elem := range elemsToMerge {
err := mergo.Map(&val, elem.Interface())
if err != nil {
return reflect.ValueOf(new), err
}
}
new = append(new, val)
}
return reflect.ValueOf(new), nil
}
func deepMerge(dst reflect.Value) (err error) {
switch dst.Kind() {
case reflect.Map:
for _, key := range dst.MapKeys() {
dstElement := dst.MapIndex(key)
switch dstElement.Kind() {
case reflect.Ptr:
case reflect.Interface:
dstElement = dstElement.Elem()
switch dstElement.Kind() {
case reflect.Slice:
new, err := mergeSlice(dstElement)
if err != nil {
return err
}
dst.SetMapIndex(key, new)
default:
if err := deepMerge(dstElement); err != nil {
return err
}
}
case reflect.Slice:
fallthrough
default:
if err := deepMerge(dstElement); err != nil {
return err
}
}
}
case reflect.Struct:
for i, n := 0, dst.NumField(); i < n; i++ {
if err = deepMerge(dst.Field(i)); err != nil {
return err
}
}
case reflect.Ptr:
fallthrough
case reflect.Interface:
dstElement := dst.Elem()
switch dstElement.Kind() {
case reflect.Slice:
new, err := mergeSlice(dstElement)
if err != nil {
return err
}
dstElement.Set(new)
default:
return deepMerge(dstElement)
}
default:
if dst.CanSet() {
dst.Set(dst)
}
}
return
}