gin-contrib/sessions 多后端会话管理 Gin 中间件 - 文章教程

gin-contrib/sessions 多后端会话管理 Gin 中间件

发布于 2021-04-05 字数 6318 浏览 1644 评论 0

gin-contrib/sessions 是一个具有多后端支持的用于会话管理的Gin中间件。

项目地址:https://github.com/gin-contrib/sessions

使用方法

下载安装

$ go get github.com/gin-contrib/sessions

开始引入

import "github.com/gin-contrib/sessions"

基本用法

单个 session

package main

import (
  "github.com/gin-contrib/sessions"
  "github.com/gin-contrib/sessions/cookie"
  "github.com/gin-gonic/gin"
)

func main() {
  r := gin.Default()
  store := cookie.NewStore([]byte("secret"))
  r.Use(sessions.Sessions("mysession", store))

  r.GET("/hello", func(c *gin.Context) {
    session := sessions.Default(c)

    if session.Get("hello") != "world" {
      session.Set("hello", "world")
      session.Save()
    }

    c.JSON(200, gin.H{"hello": session.Get("hello")})
  })
  r.Run(":8000")
}

多个 session

package main

import (
  "github.com/gin-contrib/sessions"
  "github.com/gin-contrib/sessions/cookie"
  "github.com/gin-gonic/gin"
)

func main() {
  r := gin.Default()
  store := cookie.NewStore([]byte("secret"))
  sessionNames := []string{"a", "b"}
  r.Use(sessions.SessionsMany(sessionNames, store))

  r.GET("/hello", func(c *gin.Context) {
    sessionA := sessions.DefaultMany(c, "a")
    sessionB := sessions.DefaultMany(c, "b")

    if sessionA.Get("hello") != "world!" {
      sessionA.Set("hello", "world!")
      sessionA.Save()
    }

    if sessionB.Get("hello") != "world?" {
      sessionB.Set("hello", "world?")
      sessionB.Save()
    }

    c.JSON(200, gin.H{
      "a": sessionA.Get("hello"),
      "b": sessionB.Get("hello"),
    })
  })
  r.Run(":8000")
}

后端示例

cookie-based

package main

import (
  "github.com/gin-contrib/sessions"
  "github.com/gin-contrib/sessions/cookie"
  "github.com/gin-gonic/gin"
)

func main() {
  r := gin.Default()
  store := cookie.NewStore([]byte("secret"))
  r.Use(sessions.Sessions("mysession", store))

  r.GET("/incr", func(c *gin.Context) {
    session := sessions.Default(c)
    var count int
    v := session.Get("count")
    if v == nil {
      count = 0
    } else {
      count = v.(int)
      count++
    }
    session.Set("count", count)
    session.Save()
    c.JSON(200, gin.H{"count": count})
  })
  r.Run(":8000")
}

Redis

package main

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

func main() {
  r := gin.Default()
  store, _ := redis.NewStore(10, "tcp", "localhost:6379", "", []byte("secret"))
  r.Use(sessions.Sessions("mysession", store))

  r.GET("/incr", func(c *gin.Context) {
    session := sessions.Default(c)
    var count int
    v := session.Get("count")
    if v == nil {
      count = 0
    } else {
      count = v.(int)
      count++
    }
    session.Set("count", count)
    session.Save()
    c.JSON(200, gin.H{"count": count})
  })
  r.Run(":8000")
}

Memcached

ASCII Protocol

package main

import (
  "github.com/bradfitz/gomemcache/memcache"
  "github.com/gin-contrib/sessions"
  "github.com/gin-contrib/sessions/memcached"
  "github.com/gin-gonic/gin"
)

func main() {
  r := gin.Default()
  store := memcached.NewStore(memcache.New("localhost:11211"), "", []byte("secret"))
  r.Use(sessions.Sessions("mysession", store))

  r.GET("/incr", func(c *gin.Context) {
    session := sessions.Default(c)
    var count int
    v := session.Get("count")
    if v == nil {
      count = 0
    } else {
      count = v.(int)
      count++
    }
    session.Set("count", count)
    session.Save()
    c.JSON(200, gin.H{"count": count})
  })
  r.Run(":8000")
}

Binary protocol (with optional SASL authentication)

package main

import (
  "github.com/gin-contrib/sessions"
  "github.com/gin-contrib/sessions/memcached"
  "github.com/gin-gonic/gin"
  "github.com/memcachier/mc"
)

func main() {
  r := gin.Default()
  client := mc.NewMC("localhost:11211", "username", "password")
  store := memcached.NewMemcacheStore(client, "", []byte("secret"))
  r.Use(sessions.Sessions("mysession", store))

  r.GET("/incr", func(c *gin.Context) {
    session := sessions.Default(c)
    var count int
    v := session.Get("count")
    if v == nil {
      count = 0
    } else {
      count = v.(int)
      count++
    }
    session.Set("count", count)
    session.Save()
    c.JSON(200, gin.H{"count": count})
  })
  r.Run(":8000")
}

MongoDB

package main

import (
  "github.com/gin-contrib/sessions"
  "github.com/gin-contrib/sessions/mongo"
  "github.com/gin-gonic/gin"
  "github.com/globalsign/mgo"
)

func main() {
  r := gin.Default()
  session, err := mgo.Dial("localhost:27017/test")
  if err != nil {
    // handle err
  }

  c := session.DB("").C("sessions")
  store := mongo.NewStore(c, 3600, true, []byte("secret"))
  r.Use(sessions.Sessions("mysession", store))

  r.GET("/incr", func(c *gin.Context) {
    session := sessions.Default(c)
    var count int
    v := session.Get("count")
    if v == nil {
      count = 0
    } else {
      count = v.(int)
      count++
    }
    session.Set("count", count)
    session.Save()
    c.JSON(200, gin.H{"count": count})
  })
  r.Run(":8000")
}

memstore

package main

import (
  "github.com/gin-contrib/sessions"
  "github.com/gin-contrib/sessions/memstore"
  "github.com/gin-gonic/gin"
)

func main() {
  r := gin.Default()
  store := memstore.NewStore([]byte("secret"))
  r.Use(sessions.Sessions("mysession", store))

  r.GET("/incr", func(c *gin.Context) {
    session := sessions.Default(c)
    var count int
    v := session.Get("count")
    if v == nil {
      count = 0
    } else {
      count = v.(int)
      count++
    }
    session.Set("count", count)
    session.Save()
    c.JSON(200, gin.H{"count": count})
  })
  r.Run(":8000")
}

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