How to save data in plaintext when Go Gin framework uses Redis as Session engine?

Go Gin framework Redis Session storage: plaintext data storage method

When using Redis to store Session in the Go Gin framework, Session data will be serialized by default, making it difficult to read data in Redis directly. This article provides a method to realize that Session data is saved in plaintext in Redis.

The user tried the official Gin framework Session library and the Beego framework, but neither successfully implemented plaintext saving. Manually storing Session data is feasible, but not elegant enough.

The key to the problem lies in the way Session data is serialized. The Session library of the Gin framework usually uses the default serialization method (e.g. gob), which we need to modify to JSON serialization.

Solution: Custom Session Storage Engine

It is not a best practice to directly modify the built-in Session library of the Gin framework. It is recommended to customize a Session storage engine. This allows us to precisely control the serialization process.

The following steps demonstrate how to create a custom Session storage engine to implement plaintext JSON data storage:

1. Import the necessary packages:

 import (
    "encoding/json"
    "github.com/gin-gonic/gin"
    "github.com/go-redis/redis/v8"
)

2. Create a custom Session storage engine:

 type RedisSessionStore struct {
    client *redis.Client
}

func NewRedisSessionStore(client *redis.Client) *RedisSessionStore {
    return &RedisSessionStore{client: client}
}

func (store *RedisSessionStore) Save(session *gin.Context, data interface{}) error {
    jsonData, err := json.Marshal(data)
    if err != nil {
        return err
    }
    err = store.client.Set(session.Request.Context(), session.GetString("session_id"), jsonData, 0).Err()
    return err
}

func (store *RedisSessionStore) Load(session *gin.Context) (interface{}, error) {
    val, err := store.client.Get(session.Request.Context(), session.GetString("session_id")).Result()
    if err == redis.Nil {
        return nil, nil // Session not found
    }
    if err != nil {
        return nil, err
    }
    var data interface{}
    err = json.Unmarshal([]byte(val), &data)
    return data, err
}

func (store *RedisSessionStore) Delete(session *gin.Context) error {
    return store.client.Del(session.Request.Context(), session.GetString("session_id")).Err()
}

3. Use custom engines in the Gin framework:

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

store := NewRedisSessionStore(client)
r.Use(sessions.Sessions("mysession", store))

// ... your Gin routes ...

Through the above steps, the Gin framework will use a custom RedisSessionStore and the Session data will be saved to Redis in JSON format plaintext. Remember to replace localhost:6379 for your Redis server address. Make sure that the necessary Go packages are installed: github.com/gin-gonic/gin , github.com/go-redis/redis/v8 and github.com/gin-contrib/sessions .

This method avoids directly modifying the internal code of the Gin framework, which is safer and more reliable, and easier to maintain. Through a custom Session engine, you can flexibly adjust the storage and serialization methods of Session to meet different needs.

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