Sessions

Sessions allow you to store any information specific to a user. Golf has a built-in memory-based session. To enable it, please set app.SessionManager as the following:

app.SessionManager = Golf.NewMemorySessionManager()

The code below is a simple example of how to use the session to handle user login.

package main

import (
	"github.com/dinever/golf"
	"strconv"
)

func mainHandler(ctx *golf.Context) {
	name, err := ctx.Session.Get("name")
	ctx.SetHeader("Content-Type", "text/html;charset=UTF-8")
	if err != nil {
		ctx.Send("Hello World! Please <a href=\"/login\">log in</a>. Current sessions: " + strconv.Itoa(ctx.App.SessionManager.Count()))
	} else {
		ctx.Send("Hello " + name.(string) + ". Current sessions: " + strconv.Itoa(ctx.App.SessionManager.Count()))
	}
}

func loginHandler(ctx *golf.Context) {
	ctx.Loader("default").Render("login.html", make(map[string]interface{}))
}

func loginHandlerPost(ctx *golf.Context) {
	ctx.Session.Set("name", ctx.Request.FormValue("name"))
	ctx.Send("Hi, " + ctx.Request.FormValue("name"))
}

func main() {
	app := golf.New()
	app.View.SetTemplateLoader("default", ".")
	app.SessionManager = golf.NewMemorySessionManager()
	app.Use(golf.SessionMiddleware)

	app.Get("/", mainHandler)
	app.Post("/login", loginHandlerPost)
	app.Get("/login", loginHandler)

	app.Run(":9000")
}

<html>
  <body>
    <form action="/login" method="post">
      Name:
      <input type="text" name="name">
      <input type="submit" value="Sign in">
    </form>
  </body>
</html>

As memory-based session may not be the best practice, especially for large scaled websites, Golf provides a way to define custom Session and SessionManager components, as long as they follow the interface of golf.Session and golf.SessionManager:

type SessionManager interface {
	sessionID() (string, error)
	NewSession() (Session, error)
	Session(string) (Session, error)
	GarbageCollection()
	Count() int
}

type Session interface {
	Set(key string, value interface{}) error
	Get(key string) (interface{}, error)
	Delete(key string) error
	SessionID() string
	isExpired() bool
}