如何在RxJava 2自定义运算符的onSubscribe上获取RetroFit请求的URL和方法? [英] How can I get the URL and method of RetroFit request on onSubscribe of RxJava 2 custom operator?

问题描述

因此，我正在尝试为Http请求集成Firebase性能，并在它们显示此处(步骤9).

So I'm trying to integrate Firebase performance for Http requests and add them manually as they show here (step 9).

我正在使用Retrofit 2和RxJava 2，所以我想到了一个自定义运算符，请检查以下代码:

I'm using Retrofit 2 and RxJava 2, so I had the idea of doing a custom operator, check code below:

Retrofit 2客户端

@GET("branch-{environment}/v2/branches")
    fun getBranch(@Path("environment") environment: String, @Query("location") location: String, @Query("fulfilment_type") fulfilmentType: String): Single<Response<GetBranchResponse>>

RxJava调用到改造客户端

private val client: BranchClient = clientFactory.create(urlProvider.apiUrl)

override fun getBranch(postCode: String, fulfilmentType: FulfilmentType): Single<GetBranchResponse> {
        return client
                .getBranch(environment, postCode.toUpperCase(), fulfilmentType.toString())
                .lift(RxHttpPerformanceSingleOperator(URL?, METHOD?))
                .map { it.body() }
                .subscribeIO() //custom Kotlin extension 
                .observeMain() //custom Kotlin extension 
                ...
    } 

通过提升操作的RxJava 2 Custom Operator:

class RxHttpPerformanceSingleOperator<T>(private val url: String, private val method: String) : SingleOperator<Response<T>, Response<T>> {


    private lateinit var metric: HttpMetric

    @Throws(Exception::class)
    override fun apply(observer: SingleObserver<in Response<T>>): SingleObserver<in Response<T>> {
        return object : SingleObserver<Response<T>> {

            override fun onSubscribe(d: Disposable) {

                    metric = FirebasePerformance.getInstance().newHttpMetric(url,
                            method.toUpperCase())
                    metric.start()


                observer.onSubscribe(d)
            }

            override fun onSuccess(t: Response<T>) {
                observer.onSuccess(t)

                //More info: https://firebase.google.com/docs/perf-mon/get-started-android
                metric.setRequestPayloadSize(t.raw().body().contentLength())
                metric.setHttpResponseCode(t.code())
                metric.stop()
            }

            override fun onError(e: Throwable) {
                observer.onError(e)
                metric.stop()
            }


        }
    }

因此，目前我不确定如何正确地获取请求的URL和方法(标记为URL?和METHOD?)发送给运营商，

So currently I'm not sure how it the proper way to get the URL and METHOD of the request (marked as URL? and METHOD? ) to send to the operator,

我需要onSubscribe上的它们才能启动指标 ..并且我没有响应...

I need them on onSubscribe to start the metric.. and there I don't have the response with it...

目前UGLYYYYYYYY我的操作方法是:

添加到翻新客户端:

@GET("branch-{environment}/v2/branches")
    fun getBranchURL(@Path("environment") environment: String, @Query("location") location: String, @Query("fulfilment_type") fulfilmentType: String): Call<JsonObject>

添加将参数添加为:

val request = client.getBranchURL(environment, postCode.toUpperCase(), fulfilmentType.toString()).request()

url = request.url().toString()
method = request.method()

这使我在每个请求的客户端上都有2个条目...这是没有道理的.

This makes me have 2 entries on the Client for each request... which makes no sense.

一些有用的线索: -如何获取请求网址用rxjava改造2.0?

Some helpful clues along the way: - How to get the request url in retrofit 2.0 with rxjava?

推荐答案

使用FirebaseInstance向HttpClient.Builder添加改造Interceptor，并在其中生成HttpMetrics:

Add a Retrofit Interceptor to your HttpClient.Builder with the FirebaseInstance and generate your HttpMetrics there:

class FirebasePerformanceInterceptor(val performanceInstance: FirebasePerformance) : Interceptor {
    override fun intercept(chain: Interceptor.Chain): Response {
        val request = chain.request()
        //Get request values
        val url = request.url().url()
        val requestPayloadSize = request.body()?.contentLength() ?: 0L
        val httpMethod = request.method()

        //Initialize http trace
        val trace = performanceInstance.newHttpMetric(url, httpMethod)
        trace.setRequestPayloadSize(requestPayloadSize)
        trace.start()

        //Proceed
        val response = chain.proceed(chain.request())

        //Get response values
        val responseCode = response.code()
        val responsePayloadSize = response.body()?.contentLength() ?: 0L

        //Add response values to trace and close it
        trace.setHttpResponseCode(responseCode)
        trace.setResponsePayloadSize(responsePayloadSize)
        trace.stop()

        return response
    }
}

您可以直接复制并粘贴此代码，它将起作用. 享受吧！

You can directly copy and paste this code and it will work. Enjoy!

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