gist.go

package main

import (
	"encoding/gob"
	"fmt"
	"net/http"

	"github.com/alexedwards/scs/v2"
)

// Note that the fields on the custom type are all exported.
type User struct {
	Name string
	Age  int
}

var session *scs.Session

// Register the custom type with the encoding/gob package.
func init() {
	gob.Register(User{})
}

func main() {
	session = scs.NewSession()

	mux := http.NewServeMux()
	mux.HandleFunc("/put", putHandler)
	mux.HandleFunc("/get", getHandler)

	http.ListenAndServe(":4000", session.LoadAndSave(mux))
}

func putHandler(w http.ResponseWriter, r *http.Request) {
	user := &User{"Alice", 42}
	session.Put(r.Context(), "user", user)
}

func getHandler(w http.ResponseWriter, r *http.Request) {
	user, ok := session.Get(r.Context(), "user").(User)
	if !ok {
		http.Error(w, "could not convert value to User", 500)
	}
	fmt.Fprintf(w, "%s: %d", user.Name, user.Age)
}