Gatling exec with session - scala

Question

I need to make a request in Gatling, in which I'm able to access session items (without the expression language). I need to do this, because I want to inject data into a ByteArrayBody request from a csv feeder. To demonstrate my problem, I have a small example (without the actual need of the session).
The following scenario runs fine:
val scnBase: ScenarioBuilder = scenario("Test scneario").repeat(1){
exec(http("Http Test test").get("http://google.de/"))
}
But that one doesn't (I get the exception There were no requests sent during the simulation, reports won't be generated):
val scnBase: ScenarioBuilder = scenario("Test scneario").repeat(1){
exec(session => {
http("Http Test test").get("http://google.de/")
session
})
}
I run my simulations in IntelliJ (which worked fine so far) and in the following (here minimized) simulation file:
package test.scala
import java.text.SimpleDateFormat
import java.util.Date
import io.gatling.core.Predef._
import io.gatling.core.body.ByteArrayBody
import io.gatling.core.structure.ScenarioBuilder
import io.gatling.http.Predef._
import io.gatling.http.protocol.HttpProtocolBuilder
import org.slf4j.LoggerFactory
import test.scala.TerminalTesterRequest.url
import test.scala.requests._
import test.scala.util.CharsetConverter
import scala.concurrent.duration._
import scala.language.postfixOps
class MySimulation extends Simulation {
//base URL (actually this URL is different, but it's not important)
val ecmsServerUri = "http://0.0.0.0"
//base Protocol
val httpProtocol: HttpProtocolBuilder = http
.baseUrl(ecmsServerUri)
.inferHtmlResources(BlackList(""".*\.js""", """.*\.css""", """.*\.gif""", """.*\.jpeg""", """.*\.jpg""", """.*\.ico""", """.*\.woff""", """.*\.(t|o)tf""", """.*\.png"""), WhiteList())
.acceptHeader("*/*")
.acceptEncodingHeader("gzip, deflate")
.acceptLanguageHeader("en,en-US;q=0.7,de-DE;q=0.3")
.userAgentHeader("Mozilla/4.0 (compatible; MSIE 6.0; MS Web Services Client Protocol 2.0.50727.8762)")
val scnBase: ScenarioBuilder = scenario("Test scneario").repeat(1){
exec(session => {
http("Http Test test").get("http://google.de/")
session
})
}
setUp(
scnBase.inject(constantUsersPerSec(1) during(1 seconds)).protocols(httpProtocol)
).maxDuration(5 minutes)
}
How can I run an exec request with the information of the session (or at least the data from the feeder)? I'm using Gatling 3.1.1

Answer 1

Build whatever you need in a function and put the result in the session, then refer that value in the actual request
val feeder = csv("foo.csv")
scenario("Test scenario")
.feed(feeder)
.exec(buildPostData)
.exec(http("Http Test test")
.post(createApiURL)
.body(ByteArrayBody("${postData}"))
.check(status.is(200))
)
def buildPostData: Expression[Session] = session => {
val postData: Array[Byte] =
... // getting values from csv record: session("csvHeader").as[String]
session.set("postData", postData)
}