Marshal
===
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不給你的,自己來!!! :dizzy:
> [name=郭學聰 Hsueh-Tsung Kuo] [time=Sun, 06 Aug 2017] [color=red]
---
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## who am I?
----
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* programmer from Rayark, a game company in Taiwan
* backend engineer
* usually develop something related to my work in Python, Ruby, Golang, C#
* built almost entire VOEZ game server by myself only
---
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## conclusion
#### Too Long; Didn't Read
----
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```go=
type UnixTime struct {
//anonymous field
time.Time `bson:",inline" json:",inline"`
}
func (unixTime UnixTime) MarshalJSON() ([]byte, error) {
return json.Marshal(unixTime.Time.Unix())
}
func (unixTime *UnixTime) UnmarshalJSON(data []byte) error {
var unixTimeInt int64
err := json.Unmarshal(data, &unixTimeInt)
if err != nil {
return err
}
unixTime.Time = time.Unix(unixTimeInt, 0)
return nil
}
```
----
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#### is this it?
----
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#### there seems to be much behind all this!
---
<!-- .slide: data-transition="convex" -->
## outline
----
<!-- .slide: data-transition="convex" -->
3. conclusion
4. outline
5. preface: type system
6. origin: json package
1. json marshal/unmarshal package
2. usage
3. implementation & example
7. customization
1. requirement
2. try it
3. result
4. solution
----
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8. new coming problem
1. case
2. try it
3. reason
4. dirty solution
9. better way
10. summary
1. slogan
2. special thanks
11. appendix: code to test marshal/unmarshal
12. Q&A
---
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## preface: type system
----
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```go=
// struct
type Person struct {
Name string
Age int
}
// interface
type Reader interface {
Read(p []byte) (n int, err error)
}
```
---
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## origin: json package
----
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### json marshal/unmarshal package
* https://golang.org/pkg/encoding/json/
----
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### usage
```go=
// encode
b, err := json.Marshal(&fromData)
enc := json.NewEncoder(writer)
err := enc.Encode(&fromData)
// decode
err := json.Unmarshal(b, &toData)
dec := json.NewDecoder(reader)
err := dec.Decode(&toData)
```
----
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### implementation
```go=
// encoder will call this method
type Marshaler interface {
MarshalJSON() ([]byte, error)
}
// decoder will call this method
type Unmarshaler interface {
UnmarshalJSON([]byte) error
}
```
----
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### example
```go=
// can be value or pointer receiver
func (variable Type) MarshalJSON() ([]byte, error)
// must be pointer receiver (need to overwrite variable)
func (variable *Type) UnmarshalJSON([]byte) error
```
---
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## customization
----
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### requirement
* time.Time.MarshalJSON() -> 2017-08-06T13:40:00+08:00
* prefer to use UNIX epoch time -> 1501998000
----
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### try it
----
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```go=
type AccountCoreData struct {
Name string
UUID string
CreatedAt time.Time
UpdatedAt time.Time
}
```
----
<!-- .slide: data-transition="convex" -->
```go=
// AccountCoreData reflection redefinition
type _AuxAccountCoreData struct {
*AccountCoreData `bson:",inline" json:",inline"`
CreatedAt int64
UpdatedAt int64
}
```
----
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```go=
func (accountCoreData AccountCoreData) MarshalJSON() ([]byte, error) {
return json.Marshal(_AuxAccountCoreData{
AccountCoreData: &accountCoreData,
CreatedAt: accountCoreData.CreatedAt.Unix(),
UpdatedAt: accountCoreData.UpdatedAt.Unix(),
})
}
```
----
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```go=
func (accountCoreData *AccountCoreData) UnmarshalJSON(data []byte) error {
aux := &_AuxAccountCoreData{
AccountCoreData: accountCoreData,
}
err := json.Unmarshal(data, aux)
if err != nil {
return err
}
accountCoreData.CreatedAt = time.Unix(aux.CreatedAt, 0)
accountCoreData.UpdatedAt = time.Unix(aux.UpdatedAt, 0)
return nil
}
```
----
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### result
#### 然後它就死掉了
* infinite call -> stack overflow!
* MarshalJSON() -> json.Marshal() -> MarshalJSON() -> json.Marshal() -> ...
* UnmarshalJSON() -> json.Unmarshal() -> UnmarshalJSON() -> json.Unmarshal() -> ...
----
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### solution
#### avoid inheritance
----
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```go=
// avoid inheritance!!!
type _AccountCoreDataAlias AccountCoreData
// AccountCoreData reflection redefinition
type _AuxAccountCoreData struct {
*_AccountCoreDataAlias `bson:",inline" json:",inline"`
CreatedAt int64
UpdatedAt int64
}
```
----
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```go=
func (accountCoreData AccountCoreData) MarshalJSON() ([]byte, error) {
return json.Marshal(_AuxAccountCoreData{
_AccountCoreDataAlias: (*_AccountCoreDataAlias)(&accountCoreData),
CreatedAt: accountCoreData.CreatedAt.Unix(),
UpdatedAt: accountCoreData.UpdatedAt.Unix(),
})
}
```
----
<!-- .slide: data-transition="convex" -->
```go=
func (accountCoreData *AccountCoreData) UnmarshalJSON(data []byte) error {
aux := &_AuxAccountCoreData{
_AccountCoreDataAlias: (*_AccountCoreDataAlias)(accountCoreData),
}
err := json.Unmarshal(data, aux)
if err != nil {
return err
}
accountCoreData.CreatedAt = time.Unix(aux.CreatedAt, 0)
accountCoreData.UpdatedAt = time.Unix(aux.UpdatedAt, 0)
return nil
}
```
---
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## new coming problem
----
### case
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```go=
type AccountInfo struct {
AccountCoreData `bson:",inline" json:",inline"`
BirthYear int64
Description string
}
```
----
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### try it
call json.Marshal() or json.Unmarshal() ...
* BirthYear and Description are gone
----
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### reason
#### why?
----
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#### receiver fallback
* AccountInfo.MarshalJSON() = AccountCoreData.MarshalJSON()
* AccountInfo.UnmarshalJSON() = AccountCoreData.UnmarshalJSON()
----
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### dirty solution
----
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```go=
// AccountInfo reflection redefinition
type _AuxAccountInfo struct {
*_AuxAccountCoreData `bson:",inline" json:",inline"`
BirthYear *int64
Description *string
}
```
----
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```go=
func (accountInfo AccountInfo) MarshalJSON() ([]byte, error) {
return json.Marshal(_AuxAccountInfo{
_AuxAccountCoreData: &_AuxAccountCoreData{
_AccountCoreDataAlias: (*_AccountCoreDataAlias)(&accountInfo.AccountCoreData),
CreatedAt: accountInfo.AccountCoreData.CreatedAt.Unix(),
UpdatedAt: accountInfo.AccountCoreData.UpdatedAt.Unix(),
},
BirthYear: &accountInfo.BirthYear,
Description: &accountInfo.Description,
})
}
```
----
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```go=
func (accountInfo *AccountInfo) UnmarshalJSON(data []byte) error {
aux := &_AuxAccountInfo{
_AuxAccountCoreData: &_AuxAccountCoreData{
_AccountCoreDataAlias: (*_AccountCoreDataAlias)(&accountInfo.AccountCoreData),
},
BirthYear: &accountInfo.BirthYear,
Description: &accountInfo.Description,
}
err := json.Unmarshal(data, aux)
if err != nil {
return err
}
accountInfo.AccountCoreData.CreatedAt = time.Unix(aux._AuxAccountCoreData.CreatedAt, 0)
accountInfo.AccountCoreData.UpdatedAt = time.Unix(aux._AuxAccountCoreData.UpdatedAt, 0)
return nil
}
```
----
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#### code is like a sh*t!!!
---
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## better way
----
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```go=
type UnixTime time.Time
// MarshalJSON() and UnmarshalJSON() is gone
```
----
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```go=
type UnixTime struct {
//anonymous field
time.Time `bson:",inline" json:",inline"`
}
// 1. MarshalJSON() and UnmarshalJSON() is inherited
// 2. keep bson or xml Marshal/Unmarshal
```
----
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```go=
func (unixTime UnixTime) MarshalJSON() ([]byte, error) {
return json.Marshal(unixTime.Time.Unix())
}
```
----
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```go=
func (unixTime *UnixTime) UnmarshalJSON(data []byte) error {
var unixTimeInt int64
err := json.Unmarshal(data, &unixTimeInt)
if err != nil {
return err
}
unixTime.Time = time.Unix(unixTimeInt, 0)
return nil
}
```
----
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#### Panacea?
* :x: UnixTime as anonymous field of struct
---
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## summary
----
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### slogan
----
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http://i.imgur.com/SWwsRq3.jpg
----
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http://i.imgur.com/XDq9TWd.gif
----
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> :hash: "不要太看重得與失, 而是你要享受這個過程"
> [name=田中謙介] [color=red]
there are big stories in type, struct field, interface, and receiver
----
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### special thanks
* Rayark Inc.
* CTO & CIO
* backend team
* other teams
---
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## appendix
----
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### code to test marshal/unmarshal
----
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```go=
package main
import (
"encoding/json"
"encoding/xml"
"fmt"
"time"
)
type UnixTime struct {
//anonymous field
time.Time `bson:",inline" json:",inline"`
}
func (unixTime UnixTime) MarshalJSON() ([]byte, error) {
return json.Marshal(unixTime.Time.Unix())
}
func (unixTime *UnixTime) UnmarshalJSON(data []byte) error {
var unixTimeInt int64
err := json.Unmarshal(data, &unixTimeInt)
if err != nil {
return err
}
unixTime.Time = time.Unix(unixTimeInt, 0)
return nil
}
// AccountCoreData
type AccountCoreData struct {
Name string
UUID string
CreatedAt UnixTime
UpdatedAt UnixTime
//CreatedAt time.Time
//UpdatedAt time.Time
}
/*
// avoid inheritance!!!
type _AccountCoreDataAlias AccountCoreData
// AccountCoreData reflection redefinition
type _AuxAccountCoreData struct {
//*AccountCoreData `bson:",inline" json:",inline"`
*_AccountCoreDataAlias `bson:",inline" json:",inline"`
CreatedAt int64
UpdatedAt int64
}
func (accountCoreData AccountCoreData) MarshalJSON() ([]byte, error) {
return json.Marshal(_AuxAccountCoreData{
//AccountCoreData: &accountCoreData,
_AccountCoreDataAlias: (*_AccountCoreDataAlias)(&accountCoreData),
CreatedAt: accountCoreData.CreatedAt.Unix(),
UpdatedAt: accountCoreData.UpdatedAt.Unix(),
})
}
func (accountCoreData *AccountCoreData) UnmarshalJSON(data []byte) error {
aux := &_AuxAccountCoreData{
//AccountCoreData: accountCoreData,
_AccountCoreDataAlias: (*_AccountCoreDataAlias)(accountCoreData),
}
err := json.Unmarshal(data, aux)
if err != nil {
return err
}
accountCoreData.CreatedAt = time.Unix(aux.CreatedAt, 0)
accountCoreData.UpdatedAt = time.Unix(aux.UpdatedAt, 0)
return nil
}
*/
// AccountInfo
type AccountInfo struct {
AccountCoreData `bson:",inline" json:",inline"`
BirthYear int64
Description string
}
/*
// avoid inheritance!!!
//type _AccountInfoAlias AccountInfo
// AccountInfo reflection redefinition
type _AuxAccountInfo struct {
*_AuxAccountCoreData `bson:",inline" json:",inline"`
BirthYear *int64
Description *string
}
func (accountInfo AccountInfo) MarshalJSON() ([]byte, error) {
return json.Marshal(_AuxAccountInfo{
_AuxAccountCoreData: &_AuxAccountCoreData{
//AccountCoreData: &accountInfo.AccountCoreData,
_AccountCoreDataAlias: (*_AccountCoreDataAlias)(&accountInfo.AccountCoreData),
CreatedAt: accountInfo.AccountCoreData.CreatedAt.Unix(),
UpdatedAt: accountInfo.AccountCoreData.UpdatedAt.Unix(),
},
BirthYear: &accountInfo.BirthYear,
Description: &accountInfo.Description,
})
}
func (accountInfo *AccountInfo) UnmarshalJSON(data []byte) error {
aux := &_AuxAccountInfo{
_AuxAccountCoreData: &_AuxAccountCoreData{
//AccountCoreData: &accountInfo.AccountCoreData,
_AccountCoreDataAlias: (*_AccountCoreDataAlias)(&accountInfo.AccountCoreData),
},
BirthYear: &accountInfo.BirthYear,
Description: &accountInfo.Description,
}
err := json.Unmarshal(data, aux)
if err != nil {
return err
}
accountInfo.AccountCoreData.CreatedAt = time.Unix(aux._AuxAccountCoreData.CreatedAt, 0)
accountInfo.AccountCoreData.UpdatedAt = time.Unix(aux._AuxAccountCoreData.UpdatedAt, 0)
return nil
}
*/
func main() {
accountCoreData := AccountCoreData{
Name: "Rasmus Faber",
UUID: "123e4567-e89b-12d3-a456-426655440000",
CreatedAt: UnixTime{Time: time.Now()},
UpdatedAt: UnixTime{Time: time.Unix(1501998000, 0)},
//CreatedAt: time.Now(),
//UpdatedAt: time.Unix(1501998000, 0),
}
accountInfo := AccountInfo{
AccountCoreData: accountCoreData,
BirthYear: 1979,
Description: "Swedish pianist, DJ, remixer, composer, record producer, sound engineer, and founder of the record label Farplane Records.",
}
fmt.Println("account core data:")
fmt.Println("original:")
fmt.Println(accountCoreData)
accountCoreDataJson, err := json.Marshal(accountCoreData)
if err != nil {
panic(err)
}
fmt.Println("JSON:")
fmt.Println(string(accountCoreDataJson))
var accountCoreDataParsed AccountCoreData
json.Unmarshal(accountCoreDataJson, &accountCoreDataParsed)
fmt.Println("parsed:")
fmt.Println(accountCoreDataParsed)
accountCoreDataXML, err := xml.Marshal(accountCoreData)
if err != nil {
panic(err)
}
fmt.Println("XML:")
fmt.Println(string(accountCoreDataXML))
fmt.Println("account info:")
fmt.Println("original:")
fmt.Println(accountInfo)
accountInfoJson, err := json.Marshal(accountInfo)
if err != nil {
panic(err)
}
fmt.Println("JSON:")
fmt.Println(string(accountInfoJson))
var accountInfoParsed AccountInfo
json.Unmarshal(accountInfoJson, &accountInfoParsed)
fmt.Println("parsed:")
fmt.Println(accountInfoParsed)
accountInfoXML, err := xml.Marshal(accountInfo)
if err != nil {
panic(err)
}
fmt.Println("XML:")
fmt.Println(string(accountInfoXML))
}
```
---
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## Q&A
---
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width: 34px !important;
height: 21px !important;
border: none !important;
float:right;
margin-top:-7px;
margin-right:-10px;
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