session

session is a Go session manager. It can use many session providers. Just like the database/sql and database/sql/driver.

How to install?

go get github.com/astaxie/beego/session

What providers are supported?

As of now this session manager support memory, file, Redis and MySQL.

How to use it?

First you must import it

import (
    "github.com/astaxie/beego/session"
)

Then in you web app init the global session manager

var globalSessions *session.Manager

• Use memory as provider:

  func init() {
      globalSessions, _ = session.NewManager("memory", `{"cookieName":"gosessionid","gclifetime":3600}`)
      go globalSessions.GC()
  }

• Use file as provider, the last param is the path where you want file to be stored:

  func init() {
      globalSessions, _ = session.NewManager("file",`{"cookieName":"gosessionid","gclifetime":3600,"ProviderConfig":"./tmp"}`)
      go globalSessions.GC()
  }

• Use Redis as provider, the last param is the Redis conn address,poolsize,password:

  func init() {
      globalSessions, _ = session.NewManager("redis", `{"cookieName":"gosessionid","gclifetime":3600,"ProviderConfig":"127.0.0.1:6379,100,astaxie"}`)
      go globalSessions.GC()
  }

• Use MySQL as provider, the last param is the DSN, learn more from mysql:

  func init() {
      globalSessions, _ = session.NewManager(
          "mysql", `{"cookieName":"gosessionid","gclifetime":3600,"ProviderConfig":"username:password@protocol(address)/dbname?param=value"}`)
      go globalSessions.GC()
  }

• Use Cookie as provider:

  func init() {
      globalSessions, _ = session.NewManager(
          "cookie", `{"cookieName":"gosessionid","enableSetCookie":false,"gclifetime":3600,"ProviderConfig":"{\"cookieName\":\"gosessionid\",\"securityKey\":\"beegocookiehashkey\"}"}`)
      go globalSessions.GC()
  }

Finally in the handlerfunc you can use it like this

func login(w http.ResponseWriter, r *http.Request) {
    sess := globalSessions.SessionStart(w, r)
    defer sess.SessionRelease(w)
    username := sess.Get("username")
    fmt.Println(username)
    if r.Method == "GET" {
        t, _ := template.ParseFiles("login.gtpl")
        t.Execute(w, nil)
    } else {
        fmt.Println("username:", r.Form["username"])
        sess.Set("username", r.Form["username"])
        fmt.Println("password:", r.Form["password"])
    }
}

How to write own provider?

When you develop a web app, maybe you want to write own provider because you must meet the requirements.

Writing a provider is easy. You only need to define two struct types (Session and Provider), which satisfy the interface definition. Maybe you will find the memory provider is a good example.

type SessionStore interface {
    Set(key, value interface{}) error     //set session value
    Get(key interface{}) interface{}      //get session value
    Delete(key interface{}) error         //delete session value
    SessionID() string                    //back current sessionID
    SessionRelease(w http.ResponseWriter) // release the resource & save data to provider & return the data
    Flush() error                         //delete all data
}

type Provider interface {
    SessionInit(gclifetime int64, config string) error
    SessionRead(sid string) (SessionStore, error)
    SessionExist(sid string) bool
    SessionRegenerate(oldsid, sid string) (SessionStore, error)
    SessionDestroy(sid string) error
    SessionAll() int //get all active session
    SessionGC()
}

LICENSE

BSD License http://creativecommons.org/licenses/BSD/