🐛 The session middleware performs deserialization, which will cause a crash

[lovesky]

Fiber version
v2.2.2

Issue description
Save the session to the database, restart the program, and perform session deserialization will cause a crash.

The following is a simple test, there are two functions, the test1 is gotiny.Marshal and then gotiny.Unmarshal, and the test2 is direct gotiny.Unmarshal. There is no problem executing the two together. But if you comment out the test1 and run the test2 directly, an error will be reported: panic: unknown typ:int

Code snippet

package main

import (
	"fmt"
	"gotiny" // github.com/gofiber/fiber/v2/internal/gotiny
)

type data struct {
	d map[string]interface{}
}

func main() {
	test1()
	test2()
}

func test1() {
	a := data{d: make(map[string]interface{})}
	a.d["user_role"] = 1
	b := gotiny.Marshal(&a)
        // [3 1 9 117 115 101 114 95 114 111 108 101 3 105 110 116 2]
	fmt.Println(b)
	c := data{}
	gotiny.Unmarshal(b, &c)
        // {map[user_role:1]}
	fmt.Println(c)
}

func test2() {
	d := data{}
	e := []byte{3, 1, 9, 117, 115, 101, 114, 95, 114, 111, 108, 101, 3, 105, 110, 116, 2}
        // panic: unknown typ:int
	gotiny.Unmarshal(e, &d)
        // {map[user_role:1]}
	fmt.Println(d)
}

[Fenny]

I think we need to expose the Register logic in session mw to restore / support custom structs on restart https://github.com/niubaoshu/gotiny/blob/master/register.go#L116

We can add this option to the Config where you can define custom structs. i.e.:

store := session.New(session.Config{
    RegisterType: data,
})

We also need to catch that panic by default and notify the user to use the new RegisterType option.
Do you have any advice regarding the name? Maybe we should support multiple types RegisterTypes: []interface{}?

[Fenny]

You can now use the following to solve this issue:

store := session.New()
store.RegisterType(User)

Available in v2.2.4 https://github.com/gofiber/fiber/releases/tag/v2.2.4