SignatureCalculator API - Help

Gatling (Open-Source)
1

Hi,

I am new to Gatling and Scala. My team is looking into using Gatling for our performance testing. I have been looking at the Signature Calculator API and see how I can use to register user and create a token but what I am reading here: http://gatling.io/docs/2.0.0/http/http_request.html#http-headers is a bit confusing to me. Do I need create a trait for Signature Calculator in my project and then call it somewhere in the simulation? Or how do I go about it? Can someone help me understand how this work? Some examples will be highly appreciated.

This is what I have attempted so far as I read Gatling documents: (Right now I do not understand how to use Request and RequestBuilder).

import io.gatling.core.Predef._
import io.gatling.http.Predef._
import io.gatling.http.protocol.HttpProtocolBuilder
import org.asynchttpclient.{Request, RequestBuilderBase, SignatureCalculator}

class OpenSomethingSignatureCalculator extends SignatureCalculator {
  // Default Headers
  val defaultHeaders = Map("Content-Type" -> "application/json", "Authorization" -> "Basic")
  // Http Client Config
  val httpConf: HttpProtocolBuilder = http
    .baseURL("https://mywebsite.bz") // Here is the root for all relative URLs
    .headers(defaultHeaders)
    .acceptHeader("text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8") // Here are the common headers
    .acceptEncodingHeader("gzip, deflate")
    .acceptLanguageHeader("en-US,en;q=0.5")
    .userAgentHeader("Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8; rv:16.0) Gecko/20100101 Firefox/16.0")

  override def calculateAndAddSignature(request: Request, requestBuilder: RequestBuilderBase[_]): Unit = {
  }
}
2

This is the SignatureCalculator API:

public interface SignatureCalculator {
  void calculateAndAddSignature(Request request,
                                RequestBuilderBase<?> requestBuilder);
}

These are the three ways to set this API:

.signatureCalculator(calculator: SignatureCalculator)

// use this signature if you want to directly pass a function instead of a SignatureCalculator
.signatureCalculator(calculator: (Request, RequestBuilderBase[_]) => Unit)

// use this signature if you need information from the session to compute the signature (e.g. user specific authentication keys)
// does not work with an anonymous function as in the second signature
.signatureCalculator(calculator: Expression[SignatureCalculator])

This is where I am stuck - I am not sure how to set this up to my code. Any help (possibly with an example) will be highly appreciated.
3

Run into the same road block here as well. Can anybody help??

Thanks,
Javier

4

I wish there could be any example available for SignatureCalculator :frowning:

I’m still not clear about it’s use case.

5

Have you got any answer for this yet from active forum member?