生命不止，继续go go go!!!
昨天介绍了：
Go实战–Gorilla web toolkit使用之gorilla/context
今天介绍gorilla/sessions：
Package sessions provides cookie and filesystem sessions and infrastructure for custom session backends.
特性：
* Simple API: use it as an easy way to set signed (and optionally
encrypted) cookies.
* Built-in backends to store sessions in cookies or the filesystem.
* Flash messages: session values that last until read.
* Convenient way to switch session persistency (aka “remember me”) and set
other attributes.
* Mechanism to rotate authentication and encryption keys.
* Multiple sessions per request, even using different backends.
* Interfaces and infrastructure for custom session backends: sessions from
different stores can be retrieved and batch-saved using a common API.
官网：
http://www.gorillatoolkit.org/pkg/sessions
获取：
go get github.com/gorilla/sessions
API：
应用
gorilla/mux + gorilla/sessions
package main
import (
"fmt"
"net/http"
"github.com/gorilla/mux"
"github.com/gorilla/sessions"
)
var store = sessions.NewCookieStore([]byte("something-very-secret"))
func MyHandler(w http.ResponseWriter, r *http.Request) {
session, err := store.Get(r, "s1")
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
fmt.Println(session)
session.Values["name"] = "spuerWang"
session.Save(r, w)
}
func main() {
routes := mux.NewRouter()
routes.HandleFunc("/session", MyHandler)
http.Handle("/", routes)
http.ListenAndServe(":8080", nil)
}
浏览器输入：
http://localhost:8080/session
&{ map[] 0xc0420f61b0 true 0xc0420c0d00 s1}
iris+gorilla/sessions
iris框架不会陌生，之前也有介绍奥：
https://qiita.com/edo1z/items/ff47d04b6cdd4b0de64c
main.go
package main
import (
"fmt"
"github.com/gorilla/sessions"
"github.com/kataras/iris"
"github.com/kataras/iris/context"
)
var store = sessions.NewCookieStore([]byte("hoge"))
var sess_name = "sess"
func main() {
app := iris.New()
app.Get("/", topPage)
app.Get("up", upPage)
app.Get("cl", clearPage)
app.Run(iris.Addr(":8080"))
}
func topPage(ctx context.Context) {
f := getFlash(ctx)
cnt := fmt.Sprintf(
"<h2>count is %d</h2>",
getCount(ctx),
)
html := `<br><a href="/up">Count Up</a>
<br><a href="/cl">Count Clear</a>`
ctx.HTML(f + cnt + html)
}
func upPage(ctx context.Context) {
countUp(ctx)
addFlash(ctx, "count up")
ctx.Redirect("/")
}
func clearPage(ctx context.Context) {
sessClear(ctx)
addFlash(ctx, "session clear")
ctx.Redirect("/")
}
session.go
package main
import (
"fmt"
"github.com/kataras/iris/context"
)
func getCount(ctx context.Context) int {
sess, _ := store.Get(ctx.Request(), sess_name)
cnt := 0
if v, ok := sess.Values["cnt"]; ok {
if c, ok := v.(int); ok {
cnt = c
}
}
return cnt
}
func countUp(ctx context.Context) {
sess, _ := store.Get(ctx.Request(), sess_name)
cnt := 1
if v, ok := sess.Values["cnt"]; ok {
if c, ok := v.(int); ok {
cnt = c + 1
}
}
sess.Values["cnt"] = cnt
sess.Save(ctx.Request(), ctx.ResponseWriter())
}
func sessClear(ctx context.Context) {
sess, _ := store.Get(ctx.Request(), sess_name)
sess.Values = make(map[interface{}]interface{})
sess.Save(ctx.Request(), ctx.ResponseWriter())
}
func getFlash(ctx context.Context) string {
sess, _ := store.Get(ctx.Request(), sess_name)
f := sess.Flashes()
sess.Save(ctx.Request(), ctx.ResponseWriter())
if len(f) > 0 {
return fmt.Sprintf(
`<p style="color:#090;padding:5px;">%s</p>`,
f[0],
)
}
return ""
}
func addFlash(ctx context.Context, msg string) {
sess, _ := store.Get(ctx.Request(), sess_name)
sess.AddFlash(msg)
sess.Save(ctx.Request(), ctx.ResponseWriter())
}
