How to set session variable in golang gorilla framework?

Question

My following code

package inqzincrm

import (
    "github.com/gorilla/pat"
    "github.com/gorilla/sessions"
    "net/http"
)

var store = sessions.NewCookieStore([]byte("X12h8v6BZC4QJl53KfNLshtr85gkC5OZ"), []byte("X12h8vasdf6BZC4QJl53KfNLshtr85gk"))

func init() {

    r := pat.New()
    r.Get("/", Home)

    http.Handle("/", r)
}

and in handler,

package inqzincrm

import (
    "appengine"
    "html/template"
    "net/http"
)

var aTmplt = template.Must(template.ParseFiles(
    "inqzincrm/templates/base.html",
    "inqzincrm/templates/index.html",
))

func Home(w http.ResponseWriter, r *http.Request) {
    c := appengine.NewContext(r)

    session, err := store.Get(r, "x")

    c.Infof("HOST: %s", r.Host)

    if session.IsNew {
        session.Options.Domain = r.Host
        session.Options.Path = "/"
        session.Options.MaxAge = 0
        session.Options.HttpOnly = false
        session.Options.Secure = false
    }

    if err != nil {
        c.Infof("Error getting session: %v", err)
    }
    c.Infof("Requested URL: %v", session.Values["foo"])
    session.Values["foo"] = "asdf"
    if err := aTmplt.ExecuteTemplate(w, "index.html", nil); err != nil {
        http.Error(w, err.Error(), http.StatusInternalServerError)
    }
    session.Save(r, w)
}

do not set any cookie on browser side. how ever result and err are nil indicating no problem with the functions.

How I should debug further ?

I am using Ubuntu 64 bit, Google App Engine, Go with Gorilla tool kit.

Answer 1

Have a look at my answer to a previous question here.

In short form:

import (
    "github.com/gorilla/sessions"
    "net/http"
)

// Authorization Key
var authKey = []byte("somesecret")

// Encryption Key
var encKey = []byte("someothersecret")

var store = sessions.NewCookieStore(authKey, encKey)

func initSession(r *http.Request) *sessions.Session {
    session, _ := store.Get(r, "my_cookie") // Don't ignore the error in real code
    if session.IsNew { //Set some cookie options
        session.Options.Domain = "example.org"
        session.Options.MaxAge = 0
        session.Options.HttpOnly = false
        session.Options.Secure = true
    }
    return session
}

Then, in your handlers:

func ViewPageHandler(w http.ResponseWriter, r *http.Request) {
    session := initSession(r)
    session.Values["page"] = "view"
    session.Save(r, w)
....

Your code seems to do the same thing, so without more of an example I can't see any problem with it. I can say that the example I've posted is (very slightly modified) from a working server.

Answer 2

the code session.save() should come before template execution code. it has been mentioned no where. but that was the whole mistake.