如何在使用Go Gin框架时，将Session数据以明文形式存储在Redis中？

package main

import (
    "fmt"
    "github.com/gin-contrib/sessions"
    "github.com/gin-contrib/sessions/redis"
    "github.com/gin-gonic/gin"
    "github.com/go-redis/redis/v8"
)

// 自定义序列化器
type PlaintextStore struct {
    *redis.Client
}

func (store *PlaintextStore) Set(key interface{}, value interface{}) error {
    return store.Client.Set(store.Context(), fmt.Sprintf("%v", key), fmt.Sprintf("%v", value), 0).Err()
}

func (store *PlaintextStore) Get(key interface{}) interface{} {
    val, err := store.Client.Get(store.Context(), fmt.Sprintf("%v", key)).Result()
    if err != nil {
        return nil
    }
    return val
}

func (store *PlaintextStore) Delete(key interface{}) error {
    return store.Client.Del(store.Context(), fmt.Sprintf("%v", key)).Err()
}

func main() {
    r := gin.Default()

    // 连接Redis
    client := redis.NewClient(&redis.Options{
        Addr:     "localhost:6379",
        Password: "", // No password set
        DB:       0,  // Use default DB
    })

    // 初始化Session中间件, 使用自定义的PlaintextStore
    store := redis.NewStore(10, "session:", client)
    store.Options(sessions.Options{MaxAge: 3600}) // 设置Session过期时间为1小时
    r.Use(sessions.Sessions("mysession", store))


    r.GET("/set", func(c *gin.Context) {
        session := sessions.Default(c)
        session.Set("username", "John Doe")
        session.Save()
        c.String(200, "Session set successfully")
    })

    r.GET("/get", func(c *gin.Context) {
        session := sessions.Default(c)
        username := session.Get("username")
        c.String(200, "Username: %v", username)
    })

    r.Run(":8080")
}