Golang：json文件中的路由器配置

问题描述：

I want to put my router config in an extern json config file like so:

{
  "routes": [
    {
      "name": "Index",
      "method": "GET",
      "pattern": "/",
      "handler": "Index"
    },
    {
      "name": "CountsIndex",
      "method": "GET",
      "pattern": "/counts",
      "handler": "CountsIndex"
    }
  ]
}

My related struct looks like so:

type Route struct {
    Name        string      `json:"name"`
    Method      string      `json:"method"`
    Pattern     string      `json:"pattern"`
    HandlerFunc http.HandlerFunc    `json:"handler"`
}

type Routes []Route

The Problem is the handlerFunc. When I get the config it will be a string but how to make it a go value? Can I cast it somehow?

Following error occures:

json: cannot unmarshal string into Go value of type http.HandlerFunc

Thanks

我想将路由器配置放入外部json配置文件中，例如： p>

  {
“ routes”：[
 {
“ name”：“ Index”，
“ method”：“ GET”，
“ pattern”：“ /”，
“  handler“：”索引“ 
}，
 {
” name“：” CountsIndex“，
” method“：” GET“，
” pattern“：” / counts“，
” handler“：  “ CountsIndex” 
} 
] 
} 
  code>  pre> 
 
 我的相关结构如下： p> 
 
 
  类型Route struct {
名称字符串`json：“ name”`
方法字符串`json：“ method”`
模式字符串`json：“ pattern”`
 HandlerFunc http.HandlerFunc`json：“ handler”`  
} 
 
键入Routes [] Route 
  code>  pre> 
 
 问题是处理程序功能。 当我得到配置时，它将是一个字符串，但是如何使其成为go值？ 我可以以某种方式投射它吗？ p> 
 
 
发生以下错误： p> 
 
 
 
  json：无法将字符串解组为http.HandlerFunc类型的Go值  p> 
  blockquote> 
 
 
谢谢 p> 
  div>

答

The simplest solution is to have a string instead of the http.HandlerFunc as type, and define a map with the functions.

var functions = map[string]interface{}{
    "func1": func1,
}

then after unmarshalling your json you can assign the handler using the handlername of each route

答

The problem is, that not every data could be marshaled to json (or unmarshaled). http.HandlerFunc is not a function (https://golang.org/pkg/net/http/#HandlerFunc). You cannot put it directly - but you can change handler to string and on the place when you trying to call it obtain HandlerFunc from reflect (a quite complicated) or from prepared map[string]HandlerFunc.

Golang：json文件中的路由器配置

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