将对象传递给其他包中的struct [英] Pass object to struct in other package

问题描述

我有一个主要功能，我在其中初始化一个变量，一个客户端.例如:

I have a main function, where I initiate a variable, a client. For example:

func main() {
  myClient := my.MustNewClient("localhost")
}

现在，我想将此客户端传递给另一个软件包，但是由于某些原因，我无法弄清楚该如何做.我的包裹看起来像这样:

Now I want to pass this client to another package, but for some reason I cannot figure out how to do this. My package looks like this:

package rest

import (
    "net/http"
    "github.com/Sirupsen/logrus"
)

type AssetHandler struct {
    mc my.Client
}

func (f AssetHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
    logrus.Info("bla")
    // here I want to use the client
    mc.SomeFunctionIntheClient()

}

所以我的问题是，如何使用我的软件包中的客户端(主要)?

So my question is, how do I use the client (out of main) in my package?

推荐答案

在其余的程序包中，您必须添加一个构造函数，例如:

In the package rest you have to add a constructor function like:

func NewAssetHandler(mc my.Client) AssetHandler {
    return AssetHandler{mc}
}

然后，您必须从主函数实例化处理程序.

Then you have to instantiate the handler from your main function.

否则，您将必须创建一个单独的包来存储全局变量.主包本身不能用于此目的，因为无法从其他地方访问它.

Otherwise you would have to create a separate package where you store global variables. The main package itself can not be used for this because it can't be accessed from somewhere else.

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