Load Director - Code the load

Load Director is open source hackable load testing tool inspired from jmeter, gatling, grinder to write complex load scenerio.

Install

requirements

• java jdk 1.8.* must be installed.
• JAVA_HOME is set and it must point to jdk

Download the chalba binary

• link: https://github.com/sapandang/Load-Director/releases

Extract the zip or tar

After extracting the following directory will be created.

ldr/
├── bin/
│   ├── ldr --executable for linux
│   └── ldr.bat --executable for windows
├── lib/
    ├── ldr.jar -- used in IDE
    ├── extlib -- put your jars here
    └── contains the libraries

Set environment to path

Add ldr/bin to the path of your os.

• In linux to PATH in ~/.profile
• In windows in the environment variable

Testing

To test if chalba has been registered in your system. Open terminal or command prompt , type chalba and press enter. Chalba help menu should be visible

Getting Started.

Create your working directory and enter the following command

ldr -newFile

It will generate file name Task1.java in the current directory. Use this file as template to write your scripts.

Refactor this file name to yours because every time -newFile is executed it will generate file with name Task1.java

Code snippet.

package chalba;


import skd.chalba.common.*;
import skd.chalba.requests.*;
import skd.chalba.runner.*;
import skd.chalba.interfaces.*;

/**
 * This is the template File for writing the load script
 * Please follow the structure as described in this file
 *
 * @author sapan.dang
 */
@ThreadCount(1)
@ThreadSpawnDelay(100)
public class Task1 extends Task {


    // this constructor is required
    public Task1(TaskParams taskParams) {

    }

    //This method is executed after constructor
    //script must implement this method
    @Override
    public void run() {
        super.run();

        //executable method
        //it is good practice to write your code in other method
        mainLoop();
        _testCompleted(); //finish when test complete
    }


    //Main Loop write your logic here
    public void mainLoop() {

        //Write your code in the try-catch block
        //to avoid any unexpected closure of the script
        try {


            //create GET request
            System.out.println("send get request");
            ResponseData googleResponse = requests.get("https://www.google.com/");
            System.out.println("response code " + googleResponse.code);

            //create async request
            requests.get("https://www.google.com/", new AsyncResponseCallback() {
                @Override
                public void onResponse(ResponseData arg0) {
                    System.out.println(" "+arg0.body);
                }
            });


        } catch (Exception e) {
            LOG(e);
        }
    }

}

Chalba scripts are plain java file use your favourite IDE to develop the script. Here the execution flow is like.

Constructor() -> run()

Running scrtips

chalba -f Task1.java

Setting up IDE

you can user your favourite to write the scripts just add skd.chalba-1.0-SNAPSHOT.jar to your IDE

Setting up project with Intellij and gradle

• Create java gradle project
• In scr -> main -> java create chalba package, now you can use this package as directory to develop your script.
• In build.gradle add chalba jar as dependency

//load test dependency  
compile fileTree(dir: "full path to chalba directory/chalba/lib/", includes: ['*.jar'])

• To run your script navigate to src->main->java->chalba directory
• In this directory open terminal/command prompt and run the script.

chalba -f FileName.java

Requests

Headers

Headers headers = new Headers();  
headers.put("Content-Type", "application/json" );

Query parameters

QueryParameters queryParameters = new QueryParameters();  
queryParameters.add("cityId","3757,3758")  
        .add("endDate","2019-10-07")                 
        .add("pageNo","0");  

application/x-www-form-urlencoded form data

FormBody formBody = new FormBody();  
formBody.add("j_username","admni");  
formBody.add("j_password","admin123");  
formBody.add("remember-me","false");  
formBody.add("submit","Login");

multipart/form-data;

MultiPartFormBody multiPartFormBody = new MultiPartFormBody();  
multiPartFormBody.add("multiPartData","multiData")  
                 .add("data1","data2");

Send form data

For sending the formdata mulipart/x-www-form use postFormData method

ResponseData responseData = requests.postFormData("https://postb.in/1570770392983-2035075568128",  
        formBody,queryParameters);  
System.out.println(responseData.body);

Send synchronous GET request

ResponseData responseData = requests.get("https://postb.in/1570770392983-2035075568128",headers,queryParameters);  
System.out.println("testGet "+responseData.body);

Send synchronous POST request

Posting JSON,XML and other text data.

Headers headers = new Headers();  
headers.put("user-agent","Testagent");  
  
ResponseData responseData = requests.postRaw("https://postb.in/1570772006478-3730544417630",  
        "Hii I am post",  
        headers,  
        ContentType.APPLICATION_JSON);  
System.out.println(responseData.body);

Send aSynchornous GET

Headers headers = new Headers();  
headers.put("user-agent","Testagent");  
  
  
QueryParameters queryParameters = new QueryParameters();  
queryParameters.add("cityId","3757,3758")  
        .add("endDate","2019-10-07")  
        .add("pageNo","0");  
  
 requests.get("https://postb.in/1570772006478-3730544417630", headers, queryParameters, new AsyncResponseCallback() {  
    @Override  
  public void onResponse(ResponseData response) {  
        System.out.println("testGet "+response.body);  
  
    }  
});

Send aSynchronous POST

Headers headers = new Headers();  
headers.put("user-agent", "Testagent");  
  
requests.postRaw("https://postb.in/1570772006478-3730544417630",  
        "Hii I am post",  
        headers,  
        ContentType.APPLICATION_JSON, new AsyncResponseCallback() {  
            @Override  
  public void onResponse(ResponseData response) {  
  
                System.out.println(response.body);  
  
            }  
        });

notes

delay required for rpm = 1000/(rpm/60)