Config parameters

[Amar Pawar‏]

Hi All,

I have passed environment variables in my simulation.

I have succeeded in passing them using

Through shell file:

: ${Users:=1}

export Users=$Users

: ${Ramp:=1}

export Ramp=$Ramp

And accessing them in config file:

var totalUsers:Int = if (System.getenv("Users") != null) System.getenv("Users").toInt else 1

var rampOverSeconds:Int = if (System.getenv("Ramp") != null) System.getenv("Ramp").toInt else 1

Now I want to pass scenario names using config parameters.

val foo = exec(bar.foobar_function)

Can anyone help me understanding, how to pass and access config parameters for above scenario.

Thanks

[John Arrowwood‏]

Scenario names are not passed through the environment.  For that, you need a command line parameter if you are using gatling.sh or gatling.bat.  See http://gatling.io/docs/2.1.4/general/configuration.html#command-line-options

If you are using maven or sbt, someone else will have to tell you how to do that.  :)

[empty account‏]

> If you are using maven or sbt, someone else will have to tell you how to do that

I'd be interested to know if we can pass parameters through sbt. I was thinking, it'd just be: 

$ SBT_OPTS="-Dfoo=bar" sbt

// Script 

println("value: " + System.getProperty("foo"))

But I am getting null. 

Many Thanks

Adrian

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[Pierre DAL-PRA‏]

Even if Gatling SBT Plugin provides System properties propagation to Gatling itself, this won’t work as-is if you override javaOptions (which you do in your load tests published on Github).

To re-enable system properties propagation to Gatling : 

import io.gatling.sbt.PropertyUtils._

javaOptions in Gatling := /* your javaOptions */ ++ propagatedSystemProperties

Cheers,

Pierre

[empty account‏]

Hi Pierre

> import io.gatling.sbt.PropertyUtils._

I am receiving the error: 

error: object PropertyUtils is not a member of package io.gatling.sbt

[Pierre DAL-PRA‏]

Woops….

import io.gatling.sbt.utils.PropertyUtils._

[empty account‏]

Hi Pierre, 

Thanks for getting back. 

Here is my set up:

// build.sbt

import io.gatling.sbt.utils.PropertyUtils._

javaOptions in Gatling := Seq("-Xms2G", "-Xmx5G") ++ propagatedSystemProperties

// Gatling Script 

println("value: " + System.getProperty("foo"))

// JAVA_OPTS passed to sbt

JAVA_OPTS="-Dfoo=bar" sbt

However, when I run the test, I still the value as null. 

Many Thanks

Adrian

[Pierre DAL-PRA‏]

Are you sure that JAVA_OPTS is used by SBT ?

For example, if you’re using Paul Philips’s script from sbt-extras, the env variable is JVM_OPTS, not JAVA_OPTS.

To be sure, try using your system property inside your build.sbt.

For example, add name := sys.props("foo”) to your build. And then run show name inside SBT. 

If you get a null, this means that SBT itself doesn’t have access to your system property and so there’s not a single chance it can propagate it to Gatling.

Double check SBT help (sbt -h) to get sure that you’re using the correct environment variable to pass your system properties.

Cheers,

Pierre

[empty account‏]

Hi Pierre, 

Thanks for the pointers. SBT_OPTS seem to work: 

$ SBT_OPTS="-Denv=test" sbt

// script

val env = System.getProperty("env")

Many Thanks

Aidy

[Amar Pawar‏]

Hi All,

 

Sorry for breaking in the discussion.

I am not using sbt or maven.

I have configured a shell file which passes config parameters through environment variables, and I am successful passing them as per mentioned in first post.

Now I want to pass scenario names through environment variables, which i am not able to pass using string parameters.

Can you help me with any way which can be used for passing scenario names.

Thanks

[Amar Pawar‏]

I am trying to pass parameters from shell file.

<content of shell file>

: ${SingleFilter:="Foo.getBarScenario"}

And fetch them in my simulation file.

<content of UI Simulation file>

val config_filter:String = if (System.getenv("SingleFilter") != null) System.getenv("SingleFilter") else "Foo1.getBar1"

// if I print value of config_filter here, it displays Foo.getBarScenario

val singleFiltrScns = exec(s"config_filter")

val fooUIScenario = scenario("Foo UI Simulation")

  .exec(loginScns)

  .exec(singleFiltrScns)

//but when I execute simulation gatling gives me following error 

// 17:04:16.567 [ERROR] i.g.c.a.b.SessionHookBuilder$$anonfun$build$1$$anon$1 - 'sessionHook-1' failed to execute

[John Arrowwood‏]

You can't set the scenario name via an environment variable.  You use a command line parameter.  Read the docs on startup parameters, and then build an appropriate shell script wrapper.

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John Arrowwood,

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http://www.JohnArrowwood.com
503.863.4823