Question

我的脚本中有两个场景。 第一个＆＃34; getAssets＆＃34; 方案将获取所有资产ID并将其保存在列表中，第二个方案＆＃34; fetchMetadata＆＃34; 将迭代这些ID

我必须执行＆＃34; getAssets＆＃34;方案只需一次获取所有ID，然后＆＃34; fetchMetadata＆＃34;场景将执行到给定的持续时间。

以下是＆＃34; / api / assets;的限制= $ limit＆＃34; request（我们使用$ .assets [*]。id）从这里获取id，

{
  "assets": [
    {
      "id": 3010411,
      "name": "Asset 2016-11-22 20:06:07",
      ....
      ....
    },
    {
      "id": 3010231,
      "name": "Asset 2016-11-22 20:07:07",
      ....
      ....
    }, and so on..

这是代码

import java.util.concurrent.ThreadLocalRandom
import scala.concurrent.duration._
import io.gatling.core.Predef._
import io.gatling.http.Predef._

class getAssetsMetadata extends Simulation {
    val getAssetURL = System.getProperty("getAssetURL", "https://performancetesting.net")
    val username = System.getProperty("username", "performanceuser")
    val password = System.getProperty("password", "performanceuser")
    val limit = Integer.getInteger("limit", 1000).toInt
    val userCount = Integer.getInteger("userCount", 100).toInt
    val duration = Integer.getInteger("duration",1).toInt //in minutes

    var IdList: Seq[String] = _   

    val httpProtocol = http
        .basicAuth(username, password)
        .baseURL(getAssetURL)
        .contentTypeHeader("""application/vnd.v1+json""")

    // Scenario 1 get assets
    val getAssets = scenario("Get Assets")
            .exec(http("List of Assets")
            .get(s"""/api/assets;limit=$limit""")
            .check(jsonPath("$.assets[*].id").findAll.transform {v => IdList = v; v }.saveAs("IdList"))
            )

    // Scenario 2 Fetch Metadata
    val fetchMetadata = scenario("Fetch Metadata")
        .exec(_.set("IdList", IdList))
        .exec(http("Metadata Request")
            .get("""/api/assets/${IdList.random()}/metadata""")
            )

    val scn = List(getAssets.inject(atOnceUsers(1)), fetchMetadata.inject(constantUsersPerSec(userCount) during(duration minutes)))
    setUp(scn).protocols(httpProtocol) 
}

::: ERROR :::

它抛出＆＃34;值为空＆＃34; （虽然我们这里有1000万个资产ID）。这是加特林日志

14883 [GatlingSystem-akka.actor.default-dispatcher-4] INFO  io.gatling.http.config.HttpProtocol - Warm up done
14907 [GatlingSystem-akka.actor.default-dispatcher-4] INFO  io.gatling.http.config.HttpProtocol - Start warm up
14909 [GatlingSystem-akka.actor.default-dispatcher-4] INFO  io.gatling.http.config.HttpProtocol - Warm up done
14911 [GatlingSystem-akka.actor.default-dispatcher-4] INFO  i.g.core.controller.Controller - Total number of users : 6001
14918 [GatlingSystem-akka.actor.default-dispatcher-6] INFO  i.g.c.r.writer.ConsoleDataWriter - Initializing
14918 [GatlingSystem-akka.actor.default-dispatcher-3] INFO  i.g.c.result.writer.FileDataWriter - Initializing
14923 [GatlingSystem-akka.actor.default-dispatcher-6] INFO  i.g.c.r.writer.ConsoleDataWriter - Initialized
14928 [GatlingSystem-akka.actor.default-dispatcher-3] INFO  i.g.c.result.writer.FileDataWriter - Initialized
14931 [GatlingSystem-akka.actor.default-dispatcher-4] DEBUG i.g.core.controller.Controller - Launching All Scenarios
14947 [GatlingSystem-akka.actor.default-dispatcher-12] ERROR i.g.http.action.HttpRequestAction - 'httpRequest-2' failed to execute: Value is null
14954 [GatlingSystem-akka.actor.default-dispatcher-4] DEBUG i.g.core.controller.Controller - Finished Launching scenarios executions
14961 [GatlingSystem-akka.actor.default-dispatcher-4] DEBUG i.g.core.controller.Controller - Setting up max duration
14962 [GatlingSystem-akka.actor.default-dispatcher-4] INFO  i.g.core.controller.Controller - Start user #7187317726850756780-0
14963 [GatlingSystem-akka.actor.default-dispatcher-4] INFO  i.g.core.controller.Controller - Start user #7187317726850756780-1
14967 [GatlingSystem-akka.actor.default-dispatcher-4] INFO  i.g.core.controller.Controller - End user #7187317726850756780-1
14970 [GatlingSystem-akka.actor.default-dispatcher-4] INFO  i.g.core.controller.Controller - Start user #7187317726850756780-2
14970 [GatlingSystem-akka.actor.default-dispatcher-5] INFO  io.gatling.http.ahc.HttpEngine - Sending request=List of Assets uri=https://performancetesting.net/api/assets;limit=1000: scenario=Get Assets, userId=7187317726850756780-0
14970 [GatlingSystem-akka.actor.default-dispatcher-7] ERROR i.g.http.action.HttpRequestAction - 'httpRequest-2' failed to execute: Value is null
14972 [GatlingSystem-akka.actor.default-dispatcher-7] INFO  i.g.core.controller.Controller - End user #7187317726850756780-2
14980 [GatlingSystem-akka.actor.default-dispatcher-7] ERROR i.g.http.action.HttpRequestAction - 'httpRequest-2' failed to execute: Value is null
14980 [GatlingSystem-akka.actor.default-dispatcher-4] INFO  i.g.core.controller.Controller - Start user #7187317726850756780-3
14984 [GatlingSystem-akka.actor.default-dispatcher-4] INFO  i.g.core.controller.Controller - End user #7187317726850756780-3
.....
.....
.....
61211 [GatlingSystem-akka.actor.default-dispatcher-12] INFO  i.g.core.controller.Controller - Start user #7187317726850756780-4626
61211 [GatlingSystem-akka.actor.default-dispatcher-7] ERROR i.g.http.action.HttpRequestAction - 'httpRequest-2' failed to execute: Value is null
61211 [GatlingSystem-akka.actor.default-dispatcher-7] INFO  i.g.core.controller.Controller - End user #7187317726850756780-4626
61224 [GatlingSystem-akka.actor.default-dispatcher-2] INFO  i.g.core.controller.Controller - Start user #7187317726850756780-4627
61225 [GatlingSystem-akka.actor.default-dispatcher-5] INFO  io.gatling.http.ahc.HttpEngine - Sending request=Metadata Request uri=https://performancetesting.net/api/assets/3010320/metadata: scenario=Fetch Metadata, userId=7187317726850756780-4627
61230 [GatlingSystem-akka.actor.default-dispatcher-12] INFO  i.g.core.controller.Controller - Start user #7187317726850756780-4628
61230 [GatlingSystem-akka.actor.default-dispatcher-7] INFO  io.gatling.http.ahc.HttpEngine - Sending request=Metadata Request uri=https://performancetesting.net/api/assets/3009939/metadata: scenario=Fetch Metadata, userId=7187317726850756780-4628
61233 [GatlingSystem-akka.actor.default-dispatcher-2] INFO  i.g.core.controller.Controller - End user #7187317726850756780-0
61233 [New I/O worker #12] DEBUG c.n.h.c.p.netty.handler.Processor - Channel Closed: [id: 0x8c94a1ae, /192.168.100.108:56739 :> performancetesting.net/10.20.14.176:443] with attribute INSTANCE

---- Requests ------------------------------------------------------------------
> Global                                                   (OK=261    KO=40    )
> Metadata Request                                         (OK=260    KO=40    )
> List of Assets                                           (OK=1      KO=0     )
---- Errors --------------------------------------------------------------------
> Value is null                                                      40 (100.0%)
================================================================================

谢谢。

Answer 1

ID列表未传递给其他场景，因为它是由另一个＆＃34;用户＆＃34; （会话）。

您的模拟如下所示

1个用户正在获取ID列表（并保留自己的列表）
在同一时间，n个用户尝试使用（未定义的）ID列表

第一个用户不与其他用户交谈，两个场景注入都是相互独立的。

解决此问题的方法是将列表存储在共享容器（即AtomicReference）中，并从第二个方案访问此容器。要确保填充容器，请在第二个方案的开头注入nothingFor步骤，以等待第一个方案完成。

另一种方法是在第二个场景的开头获取ID列表 - 如果之前没有取过它（参见上面的容器）。

我确定有办法实现这一点（即使用一些进纸器并在实际测试之前获取ID列表）

为什么我在Gatling中执行两个场景时获得Value是Null？

1 个答案: