How to set session variable in golang gorilla framework? - google-app-engine

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.