如何使用 MacWire(播放框架)向服务注入依赖项 [英] how to inject dependencies to a service with MacWire (play framework)

问题描述

我有一个服务类，服务有一个方法 getSomethingFromApi ，现在，我想要播放配置实例，以便我可以从 application.conf 中提取内容，以及播放 WSClient，所以我可以执行http调用.

I have a service class, and the service have one method getSomethingFromApi , now , I want to have play Configuration instance so I can pull stuff from the application.conf, and a play WSClient so I can perform http calls.

这就是我希望我的服务的外观:

this is how I want my service to look:

class MyApiService {

  def getSomethingFromApi(whichApi: String): Future[ApiRes] = {
    wsClient.url(configuration.getString(whichApi)).withHttpHeaders(("Content-Type", "application/json")).get.map { res =>
      response.status match {
        case Status.OK => // do something
        case _ => throw new Exception
      }
    }
  }

}

这是连接我的服务的 ServicesModule:

and this is the ServicesModule that is wiring my services:

import com.softwaremill.macwire._

trait ServicesModule {

  lazy val myService: MyApiService = wire[MyApiService]

}

我现在的问题是使用连线播放配置和 WSClient 实例的正确方法是什么..?因为目前我在我的服务中需要这些实例，但我没有它们，我应该如何以正确的方式做到这一点?谢谢

my question now is what is the right way of using wiring play Configuration and WSClient instances..? cause currently i need those instances in my service but i dont have them, how should i do this the right way? thanks

推荐答案

对于配置我建议使用类似 PureConfig 并按如下方式加载配置

For the configuration I suggest using something like PureConfig and load the configuration as follows

import pureconfig._
import pureconfig.error.ConfigReaderFailures

case class YourConfClass(name: String, quantity: Int)

val config: Either[pureconfig.error.ConfigReaderFailures,YourConfClass] = loadConfig[YourConfClass]

然后可以使用 macwire 将其传递给应用的任何组件.

This then can be passed on to any component of your app using macwire.

从 Play 2.6.X 开始，应该使用 ws 依赖项提供的 AhcWSComponents，如下所示:

As of Play 2.6.X one should use AhcWSComponents that are provided by the ws dependency as follows:

在您的 build.sbt 文件中，将 ws 依赖项添加到您的项目中

In your build.sbt file add the ws dependency to your project

libraryDependencies += ws

在你的模块 trait 中混合 AhcWSComponents trait 并连接 WSClient

In your module trait mix-in the AhcWSComponents trait and wire the WSClient

trait ServicesModule with AhcWSComponents {
    lazy val wsClient = wire[WSClient]
    lazy val apiService = wire[MyApiService]
}

在您的 MyApiService 中添加 WSClient 作为参数.给构造函数

In your MyApiService add the WSClient as a param. to the constructor

class MyApiService(wsClient: WSClient) { ... }

现在你完成了.此一般规则适用于所有提供的依赖项.

And now you're done. This general rule applies to all provided dependencies.

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