sessions

Gin middleware for session management with multi-backend support:

• cookie-based
• Redis
• memcached
• MongoDB
• memstore
• PostgreSQL

Usage

Start using it

Download and install it:

go get github.com/cryptotradev/sessions

Import it in your code:

import "github.com/cryptotradev/sessions"

Basic Examples

single session

package main

import (
  "github.com/cryptotradev/sessions"
  "github.com/cryptotradev/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")
}

multiple sessions

package main

import (
  "github.com/cryptotradev/sessions"
  "github.com/cryptotradev/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")
}

Backend Examples

cookie-based

package main

import (
  "github.com/cryptotradev/sessions"
  "github.com/cryptotradev/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/cryptotradev/sessions"
  "github.com/cryptotradev/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/cryptotradev/sessions"
  "github.com/cryptotradev/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/cryptotradev/sessions"
  "github.com/cryptotradev/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/cryptotradev/sessions"
  "github.com/cryptotradev/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/cryptotradev/sessions"
  "github.com/cryptotradev/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")
}

PostgreSQL

package main

import (
	"database/sql"
	"github.com/cryptotradev/sessions"
	"github.com/cryptotradev/sessions/postgres"
	"github.com/gin-gonic/gin"
)

func main() {
	r := gin.Default()
	db, err := sql.Open("postgres", "postgresql://username:password@localhost:5432/database")
	if err != nil {
		// handle err
	}

	store, err := postgres.NewStore(db, []byte("secret"))
	if err != nil {
		// handle err
	}

	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")
}