英文:
Passing context to sub-directory
问题
我有一个名为Context的结构体，用于应用程序上下文。ConfigureRouter函数接收上下文作为参数，并设置全局变量c，以便同一文件中的中间件可以使用它。
var c *core.Context
func ConfigureRouter(ctx *core.Context, router *httprouter.Router) {
c = ctx //使上下文在所有中间件中可用
router.POST("/v1/tokens/create", token.Create) //使用httprouter
}
上面列出的一个路由调用了token.Create（来自子目录的token包），但它也需要上下文。
//token/token.go
func Create(w http.ResponseWriter, r *http.Request, params httprouter.Params) {
//帮帮我！我需要上下文来做一些事情
}
我该如何将上下文传递给token包？
英文:
I have a Context struct that is used for the Application Context. The ConfigureRouter function receives the context as a parameter and sets the global variable c so middleware in the same file can use it.
var c *core.Context
func ConfigureRouter(ctx *core.Context, router *httprouter.Router) {
c = ctx //make context available in all middleware
router.POST("/v1/tokens/create", token.Create) //using httprouter
}
The one route listed above calls token.Create ( from the token package which is a sub-directory) but it needs the context too.
//token/token.go
func Create(w http.ResponseWriter, r *http.Request, params httprouter.Params) {
//Help! I need the context to do things
}
How can I pass the context to the token package?
答案1
得分: 1
你可以将Create函数重新定义为返回处理程序函数的函数：
func Create(ctx *core.Context) httprouter.Handle {
return func(w http.ResponseWriter, r *http.Request, params httprouter.Params) {
// 现在你有了上下文可以进行操作
}
}
其中httprouter.Handle是由httprouter定义的函数类型，其定义为type Handle func(http.ResponseWriter, *http.Request, Params)。
然后在ConfigureRouter函数中可以这样使用：
func ConfigureRouter(ctx *core.Context, router *httprouter.Router) {
router.POST("/v1/tokens/create", token.Create(ctx))
}
英文:
You can redefine your Create function as a function that returns the handler function:
func Create(ctx *core.Context) httprouter.Handle {
return func(w http.ResponseWriter, r *http.Request, params httprouter.Params) {
// Now you have the context to do things
}
}
Where httprouter.Handle is a func type defined by httprouter to be type Handle func(http.ResponseWriter, *http.Request, Params).
And then you would use it like this in ConfigureRouter:
func ConfigureRouter(ctx *core.Context, router *httprouter.Router) {
router.POST("/v1/tokens/create", token.Create(ctx))
}
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