如何使请求绑定的数据在Ktor中全局可用? [英] How to make request-bound data globally available in Ktor?

问题描述

我正在Ktor中建立一个微服务.当我们在应用程序模块中工作时，Ktor提供对包含授权数据的call对象的访问.

I'm building a microservice in Ktor. While we are working within the application module, Ktor provides access to the call object which contains authorization data.

我的问题是我需要从服务级别的类访问call对象.在Spring中，您可以通过访问SecurityContext来做到这一点，而SecurityContext可以通过ThreadLocal在全球范围内使用.协程驱动的Ktor没有这种选择.

My problem is that I need to access the call object from a service-level class. In Spring, you would do this by accessing the SecurityContext which is globally available via a ThreadLocal. Ktor, being coroutine-driven, does not have that option.

我真的需要通过服务层方法传递call对象，还是在Ktor中有一种方法可以让您从任何地方访问某种调用上下文"对象?

Do I really need to pass down the call object through my service layer methods, or is there a way in Ktor to have some sort of "call context" object that you can access from anywhere?

推荐答案

我认为目前没有内置的官方机会.

I think there is no build-in official opportunity at the moment.

我写了一个实现该行为的Ktor功能. 答案是用几句话来形容它很复杂.

I have written a Ktor-Feature, that implements that behaviour. The answer is to complicated to describe it in a few words.

如果有兴趣，请查看代码+示例.还提供了安装指南.

Check out the code + samples, if you are interested. Also an install guide is provided.

=> https://github.com/MaaxGr/ktor-globalcalldata

直接或从路由间接调用暂停函数test():

Call suspending function test() directly or indirectly from a route:

routing {
    get("/test") {
        test()
        call.respond("OK")
    }
}

通过callData().call

suspend fun test() {
    val url = callData().call.request.uri
    println(url) // prints "/test"
}

该库还允许添加可以绑定到当前协程/调用的自定义属性.

The library also allows to add custom properties that can be bound to the current coroutine/call.

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