JMeter-to-k6 PR review: JSON path extractor

json-path-extractor.jmx

<?xml version="1.0" encoding="UTF-8"?>
<jmeterTestPlan version="1.2" properties="5.0" jmeter="5.0 r1840935">
  <hashTree>
    <TestPlan guiclass="TestPlanGui" testclass="TestPlan" testname="Test Plan" enabled="true">
      <stringProp name="TestPlan.comments"></stringProp>
      <boolProp name="TestPlan.functional_mode">false</boolProp>
      <boolProp name="TestPlan.tearDown_on_shutdown">true</boolProp>
      <boolProp name="TestPlan.serialize_threadgroups">false</boolProp>
      <elementProp name="TestPlan.user_defined_variables" elementType="Arguments" guiclass="ArgumentsPanel" testclass="Arguments" testname="User Defined Variables" enabled="true">
        <collectionProp name="Arguments.arguments"/>
      </elementProp>
      <stringProp name="TestPlan.user_define_classpath"></stringProp>
    </TestPlan>
    <hashTree>
      <ThreadGroup guiclass="ThreadGroupGui" testclass="ThreadGroup" testname="Thread Group" enabled="true">
        <stringProp name="ThreadGroup.on_sample_error">continue</stringProp>
        <elementProp name="ThreadGroup.main_controller" elementType="LoopController" guiclass="LoopControlPanel" testclass="LoopController" testname="Loop Controller" enabled="true">
          <boolProp name="LoopController.continue_forever">false</boolProp>
          <stringProp name="LoopController.loops">1</stringProp>
        </elementProp>
        <stringProp name="ThreadGroup.num_threads">1</stringProp>
        <stringProp name="ThreadGroup.ramp_time">1</stringProp>
        <boolProp name="ThreadGroup.scheduler">false</boolProp>
        <stringProp name="ThreadGroup.duration"></stringProp>
        <stringProp name="ThreadGroup.delay"></stringProp>
      </ThreadGroup>
      <hashTree>
        <HTTPSamplerProxy guiclass="HttpTestSampleGui" testclass="HTTPSamplerProxy" testname="HTTP Request" enabled="true">
          <elementProp name="HTTPsampler.Arguments" elementType="Arguments" guiclass="HTTPArgumentsPanel" testclass="Arguments" testname="User Defined Variables" enabled="true">
            <collectionProp name="Arguments.arguments"/>
          </elementProp>
          <stringProp name="HTTPSampler.domain">httpbin.org</stringProp>
          <stringProp name="HTTPSampler.port"></stringProp>
          <stringProp name="HTTPSampler.protocol">https</stringProp>
          <stringProp name="HTTPSampler.contentEncoding"></stringProp>
          <stringProp name="HTTPSampler.path">/json</stringProp>
          <stringProp name="HTTPSampler.method">GET</stringProp>
          <boolProp name="HTTPSampler.follow_redirects">true</boolProp>
          <boolProp name="HTTPSampler.auto_redirects">false</boolProp>
          <boolProp name="HTTPSampler.use_keepalive">true</boolProp>
          <boolProp name="HTTPSampler.DO_MULTIPART_POST">false</boolProp>
          <stringProp name="HTTPSampler.embedded_url_re"></stringProp>
          <stringProp name="HTTPSampler.connect_timeout"></stringProp>
          <stringProp name="HTTPSampler.response_timeout"></stringProp>
        </HTTPSamplerProxy>
        <hashTree/>
        <com.atlantbh.jmeter.plugins.jsonutils.jsonpathextractor.JSONPathExtractor guiclass="com.atlantbh.jmeter.plugins.jsonutils.jsonpathextractor.gui.JSONPathExtractorGui" testclass="com.atlantbh.jmeter.plugins.jsonutils.jsonpathextractor.JSONPathExtractor" testname="jp@gc - JSON Path Extractor" enabled="false">
          <stringProp name="VAR">slideshowAuthor</stringProp>
          <stringProp name="JSONPATH">slideshow.author</stringProp>
          <stringProp name="DEFAULT"></stringProp>
          <stringProp name="VARIABLE"></stringProp>
          <stringProp name="SUBJECT">BODY</stringProp>
        </com.atlantbh.jmeter.plugins.jsonutils.jsonpathextractor.JSONPathExtractor>
        <hashTree/>
        <JSONPostProcessor guiclass="JSONPostProcessorGui" testclass="JSONPostProcessor" testname="JSON Extractor" enabled="true">
          <stringProp name="JSONPostProcessor.referenceNames">slideshowAuthor</stringProp>
          <stringProp name="JSONPostProcessor.jsonPathExprs">$.slideshow.author</stringProp>
          <stringProp name="JSONPostProcessor.match_numbers"></stringProp>
          <stringProp name="JSONPostProcessor.defaultValues">test name</stringProp>
        </JSONPostProcessor>
        <hashTree/>
      </hashTree>
    </hashTree>
  </hashTree>
</jmeterTestPlan>

json-path-extractor.js

import http from "k6/http"
import jsonpath from "../build/jsonpath.js"

const vus = 1
let url, opts, auth, r, regex, match, matches, extract, output
let csvPage = {}, csvColumns = {}

const constants = {}

const vars = {}

const files = {}

export let options = {
  stages: [{"target":1,"duration":"1s"}]
}

export default function (data) {
  if (__VU >= 1 && __VU <= 1) {
    url = `${`https`}://${`httpbin.org`}${`/json`}`
    opts = {
      redirects: 999
    }
    r = http.request(`GET`, url, '', opts)

    {
      const queries = ["$.slideshow.author"]
      const outputs = [`slideshowAuthor`]
      const defaults = ["test name"]
      const body = (() => {
        try { return JSON.parse(r.body) }
        catch (e) { return null }
      })()
      if (body) {
        for (let i = 0; i < queries.length; i++) {
          const query = queries[i]
          const output = outputs[i]
          const defaultValue = defaults[i]
          matches = jsonpath.query(body, query)
          extract = (matches.length === 0 ? null : matches[Math.floor(Math.random()*matches.length)])
          vars[output] = extract || defaultValue
        }
      } else defaults.forEach((value, i) => { vars[outputs[i]] = value })
      console.log(JSON.stringify(vars));
    }
  } else throw new Error('Unexpected VU: ' + __VU)
}