英文:
Undefined return type in Go
问题
我对Go语言还比较新，遇到了一个使用mux-gorilla sessions/cookies的代码片段的问题。这段代码有很多冗余的部分，我想通过下面的函数来减少冗余：
func isLoggedIn(w http.ResponseWriter, r *http.Request) (bool, *Session) {
session, err := store.Get(r, "user")
var logged bool = true
if err != nil { // 需要删除cookie。
expired := &http.Cookie{Path: "/", Name: "user", MaxAge: -1, Expires: time.Now().Add(-100 * time.Hour)}
http.SetCookie(w, expired)
logged := false
}
return logged, session
}
不幸的是，我得到了以下编译错误：undefined: Session
如果store.Get函数可以返回Session类型，为什么会出现未定义的错误呢？请注意，之前已经使用了store = sessions.NewCookieStore([]byte(secret))来声明了store，使用了"gorilla/sessions"包。
英文:
I'm fairly new to Go and am having trouble with a code snippet that uses mux-gorilla sessions/cookies. There is a lot of redundancy that I would like to reduce with the following function:
func isLoggedIn(w http.ResponseWriter, r *http.Request) (bool, *Session) {
session, err := store.Get(r, "user")
var logged bool = true
if err != nil { // Need to delete the cookie.
expired := &http.Cookie{Path: "/", Name: "user", MaxAge: -1, Expires: time.Now().Add(-100 * time.Hour)}
http.SetCookie(w, expired)
logged := false
}
return logged, session
}
Unfortunately I get the following compilation error: undefined: Session
How can this type be undefined if it can be returned by the store.Get function? Note that store was declared before as store = sessions.NewCookieStore([]byte(secret)), using the "gorilla/sessions" package.
答案1
得分: 3
Go需要知道在哪个包中找到Session：sessions.Session。
错误出现在你的isLoggedIn函数的签名上。
所以你修改后的代码应该是：
import "github.com/gorilla/sessions"
func isLoggedIn(w http.ResponseWriter, r *http.Request) (bool, *sessions.Session) {
...
}
英文:
Go needs to know which package to find Session in: sessions.Session.
The error is on the signature of your func isLoggedIn
So your modified code would be:
import "github.com/gorilla/sessions"
func isLoggedIn(w http.ResponseWriter, r *http.Request) (bool, *sessions.Session) {
...
}
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