Transfer response of test to next json in chain tests

Gatling (Open-Source)
#1

Hi people.

I’m beginner using Gatling and I have the following task to do:

  1. Execute the first first test.
  2. deserialize the json response.
  3. Grab the element to use in json body in the second test in chain.

Below the code.

  def DinamicoImediato() = {

    val gson = new Gson()

    repeat(1) {
      feed(customFeeder)
        .exec(http("DinamicoImediato")
          .post("qrcode/dinamico/imediato/v2/")
          .body(ElFileBody("bodies/pix/payloadPixDinamicoImediato.json")).asJson
          .check(status.is(200))
          .check(jsonPath("$..response").saveAs("response")))
        
        .exec(session => {
          val castJson = gson.fromJson(session("session").as[String].replaceAll("""\\""", ""), JsonObject().getClass)
          val newVar = castJson.get("qrCodeValue").toString

          http("Processamento")
            .post("qrcode/processamento/")
            .body(StringBody("{" +
              "\n\t\"cpfCnpj\": \"09769005053\"," +
              "\n\t\"qrCodeValue\": \""+newVar+"\"\n}")).asJson
            .check(status.is(200))
            .check(jsonPath("$..response").saveAs("novo"))
          session
        })
     }
  }

Error mensage: java.util.NoSuchElementException: No attribute named 'session' is defined

Where am I going wrong?

#2

Hi Saulo,

Gatling is great and its cool you are trying this tool out.,

now the issue seems to me, that you are saving the response body here as a “response” session attribute here .check(jsonPath("$..response").saveAs("response"))) however you are fetching a “session” named session attribute, which probably is non-existent val castJson = gson.fromJson(session("session").as[String].replaceAll("""\\""", ""), JsonObject().getClass)

That to me seems like where the gatling is throwing the following exception

Error mensage: java.util.NoSuchElementException: No attribute named 'session' is defined
1 Like
#3

Several things wrong.

First, you can’t use Gatling DSL inside functions, only the Session API, see Gatling - Scenario.

Then, you should capture the qrCodeValue directly with a JsonPath (or JMESPath) expression, not try to capture a part of the response, then turn it back to String, then parse it again with GSON.

 .check(jsonPath(A_PROPER_EXRESSION_TO_CAPTURE_QRCODE).saveAs("qrCodeValue")))

Finally, Scala has built in support for multilines Strings:

StringBody("""{
  "cpfCnpj": "09769005053",
  "qrCodeValue": "#{qrCodeValue}"
}")
1 Like
#4

Hi @kami0619.

You are right, I wrote the code wrong. Sorry! =/
I changed in the code but i still have the same problem. Look the code below:

  def DinamicoImediato() = {

    val gson = new Gson()

    repeat(1) {
      feed(customFeeder)
        .exec(http("DinamicoImediato")
          .post("qrcode/dinamico/imediato/v2/")
          .body(ElFileBody("bodies/pix/payloadPixDinamicoImediato.json")).asJson
          .check(status.is(200))
          .check(jsonPath("$..response").saveAs("body")))

        .exec(session => {
          val castJson = gson.fromJson(session("body").as[String].replaceAll("""\\""", ""), JsonObject().getClass)
          val newVar = castJson.get("qrCodeValue").toString

          http("Processamento")
            .post("qrcode/processamento/")
            .body(StringBody("{" +
              "\n\t\"cpfCnpj\": \"09769005053\"," +
              "\n\t\"qrCodeValue\":\""+newVar+"\"\n}")).asJson
            .check(status.is(200))
            .check(jsonPath("$..response").saveAs("novo1"))

            session
        })

        .exec(session => {
          println(session("novo1").as[String])
          session
        })

     }
  }
#5

did you look at @slandelle suggestions too ?

#6

Hi @slandelle .

You are right, but I have question.

The response the first exec() is:

[
    {
        "status": 200,
        "response": "{\"qrCodeValue\":\"XXXXZZZZYYYUUUOOO\",\"calendarioCriacao\":\"2023-01-23T12:44:41.383016\"}"
    }
]

And I need to grab the element “qrCodeValue” and put in StringBody of second exec(), that is, I can’t put all the response. And finally, I wanted to print the response the second response (session(“novo1”).

How can I do this?

#7

Hi @kami0619.

Yes, I looked the suggestions and I made my notes. What do you think of what I pointed out?

#8

OK, so you have to value in your JSON enveloppe that’s a JSON payload, encoded as a JSON String value. :man_shrugging:

So indeed, you have to parse in 2 phases:

  1. jsonPath("$..response") but then this gives you the DECODED value so you don’t have to remove the \.
  2. use transform to parse this String.
val gson = new Gson()

jsonPath("$..response")
  .transform { response => 
     val parsedResponse = gson.fromJson(session("body").as[String]), classOf[JsonObject])
    parsedResponse.get("qrCodeValue").toString
  }.saveAs("qrCodeValue")
1 Like
#9

Hi @slandelle and @kami0619

Thanks for all the help. I got the solution, see the code below

 def DinamicoImediato() = {

    val gson = new Gson()

    repeat(1) {
      feed(customFeeder)
        .exec(http("DinamicoImediato")
          .post("url")
          .body(ElFileBody("bodies/pix/payloadPixDinamicoImediato.json")).asJson
          .check(status.is(200))
          .check(jsonPath("$..response").transform { response =>
            val parsedResponse = gson.fromJson(response.replaceAll("""\\""", ""), JsonObject().getClass)
            parsedResponse.get("qrCodeValue").toString}
            .saveAs("qrCodeValue")))

        .exec(http("Processamento")
          .post("qrcode/processamento/")
          .body(StringBody("{" +
            "\n\t\"cpfCnpj\": \"111111111\"," +
            "\n\t\"qrCodeValue\":${qrCodeValue}\n}")).asJson
          .check(status.is(200))
          .check(jsonPath("$..response").transform { response =>
            val parsedResponse = gson.fromJson(response.replaceAll("""\\""", ""), JsonObject().getClass)
            parsedResponse.get("endToEnd").toString}
            .saveAs("endToEnd")))
}
#10