不能通过密钥获得大猩猩会话值 [英] cannot get gorilla session value by key
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问题描述
我无法通过这种方式从会话中获得价值，它是 nil ：
I cannot get value from session this way, it is nil:
session := initSession(r)
valWithOutType := session.Values[key]
完整代码：
package main
import (
"fmt"
"github.com/gorilla/mux"
"github.com/gorilla/sessions"
"log"
"net/http"
)
func main() {
rtr := mux.NewRouter()
rtr.HandleFunc("/setSession", handler1).Methods("GET")
rtr.HandleFunc("/getSession", handler2).Methods("GET")
http.Handle("/", rtr)
log.Println("Listening...")
http.ListenAndServe(":3000", http.DefaultServeMux)
}
func handler1(w http.ResponseWriter, r *http.Request) {
SetSessionValue(w, r, "key", "value")
w.Write([]byte("setSession"))
}
func handler2(w http.ResponseWriter, r *http.Request) {
w.Write([]byte("getSession"))
value := GetSessionValue(w, r, "key")
fmt.Println("value from session")
fmt.Println(value)
}
var authKey = []byte("secret") // Authorization Key
var encKey = []byte("encKey") // Encryption Key
var store = sessions.NewCookieStore(authKey, encKey)
func initSession(r *http.Request) *sessions.Session {
store.Options = &sessions.Options{
MaxAge: 3600 * 1, // 1 hour
HttpOnly: true,
}
session, err := store.Get(r, "golang_cookie")
if err != nil {
panic(err)
}
return session
}
func SetSessionValue(w http.ResponseWriter, r *http.Request, key, value string) {
session := initSession(r)
session.Values[key] = value
fmt.Printf("set session with key %s and value %s\n", key, value)
session.Save(r, w)
}
func GetSessionValue(w http.ResponseWriter, r *http.Request, key string) string {
session := initSession(r)
valWithOutType := session.Values[key]
fmt.Printf("valWithOutType: %s\n", valWithOutType)
value, ok := valWithOutType.(string)
if !ok {
fmt.Println("cannot get session value by key: " + key)
}
return value
}
输出：
Output:
myMac ~/forStack/session $ go run ./session.go
2015/01/30 16:47:26 Listening...
首先我打开url http：// localhost：3000 / setSession 并获取输出：
First I open url http://localhost:3000/setSession and get output:
set session with key key and value value
b
valWithOutType: %!s(<nil>)
cannot get session value by key: key
value from session
为什么 valWithOutType 是零，但我设定了它请求 / setSession ？
Why valWithOutType is nil, although I set it requesting /setSession?
代码根据@isza答案，但会话值仍然是 nil 。
I changed code according to @isza answer, but session value is still nil.
package main
import (
"fmt"
"github.com/gorilla/mux"
"github.com/gorilla/sessions"
"log"
"net/http"
)
func main() {
rtr := mux.NewRouter()
rtr.HandleFunc("/setSession", handler1).Methods("GET")
rtr.HandleFunc("/getSession", handler2).Methods("GET")
http.Handle("/", rtr)
log.Println("Listening...")
store.Options = &sessions.Options{
MaxAge: 3600 * 1, // 1 hour
HttpOnly: true,
Path: "/", // to match all requests
}
http.ListenAndServe(":3000", http.DefaultServeMux)
}
func handler1(w http.ResponseWriter, r *http.Request) {
SetSessionValue(w, r, "key", "value")
w.Write([]byte("setSession"))
}
func handler2(w http.ResponseWriter, r *http.Request) {
w.Write([]byte("getSession"))
value := GetSessionValue(w, r, "key")
fmt.Println("value from session")
fmt.Println(value)
}
var authKey = []byte("secret") // Authorization Key
var encKey = []byte("encKey") // Encryption Key
var store = sessions.NewCookieStore(authKey, encKey)
func initSession(r *http.Request) *sessions.Session {
session, err := store.Get(r, "golang_cookie")
if err != nil {
panic(err)
}
return session
}
func SetSessionValue(w http.ResponseWriter, r *http.Request, key, value string) {
session := initSession(r)
session.Values[key] = value
fmt.Printf("set session with key %s and value %s\n", key, value)
session.Save(r, w)
}
func GetSessionValue(w http.ResponseWriter, r *http.Request, key string) string {
session := initSession(r)
valWithOutType := session.Values[key]
fmt.Printf("valWithOutType: %s\n", valWithOutType)
value, ok := valWithOutType.(string)
if !ok {
fmt.Println("cannot get session value by key: " + key)
}
return value
}
推荐答案
没有找到答案我决定不使用cookie存储，而是使用redis存储进行会话。我找到了完整的工作示例此处
As I have not found answer I decided not to use cookie store but use redis store for sessions. And I found full working example here
package main
import (
"fmt"
"github.com/aaudis/GoRedisSession"
"log"
"net/http"
)
var (
redis_session *rsess.SessionConnect
)
func main() {
// Configurable parameters
rsess.Prefix = "sess:" // session prefix (in Redis)
rsess.Expire = 1800 // 30 minute session expiration
// Connecting to Redis and creating storage instance
temp_sess, err := rsess.New("sid", 0, "127.0.0.1", 6379)
if err != nil {
log.Printf("%s", err)
}
redis_session = temp_sess // assing to global variable
http.HandleFunc("/", Root)
http.HandleFunc("/get", Get)
http.HandleFunc("/set", Set)
http.HandleFunc("/des", Des)
http.ListenAndServe(":8888", nil)
}
func Root(w http.ResponseWriter, r *http.Request) {
w.Header().Add("Content-Type", "text/html")
fmt.Fprintf(w, `
Redis session storage example:<br><br>
<a href="/set">Store key in session</a><br>
<a href="/get">Get key value from session</a><br>
<a href="/des">Destroy session</a>
`)
}
// Destroy session
func Des(w http.ResponseWriter, r *http.Request) {
s := redis_session.Session(w, r)
s.Destroy(w)
fmt.Fprintf(w, "Session deleted!")
}
// Set variable to session
func Set(w http.ResponseWriter, r *http.Request) {
s := redis_session.Session(w, r)
s.Set("UserID", "1000")
fmt.Fprintf(w, "Setting session variable done!")
}
// Get variable from session
func Get(w http.ResponseWriter, r *http.Request) {
s := redis_session.Session(w, r)
fmt.Fprintf(w, "Value %s", s.Get("UserID"))
}
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