Скачать или смотреть Mastering Locust for Parallel API Requests: Creating Companies and Employees

Learn how to use `Locust` to manage sequential tasks in API requests effectively. This guide will walk you through creating a company and its employees in parallel tasks while preserving variable values for efficiency.
---
This video is based on the question https://stackoverflow.com/q/74074308/ asked by the user 'user27930' ( https://stackoverflow.com/u/4496354/ ) and on the answer https://stackoverflow.com/a/74100571/ provided by the user 'user27930' ( https://stackoverflow.com/u/4496354/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Using variables from earlier in a sequential list of tasks

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Mastering Locust for Parallel API Requests: Creating Companies and Employees

When working with API testing and load generation, one common scenario developers face is managing a series of tasks where variables from earlier tasks need to be reused in subsequent ones. For instance, you might need to create a company first, followed by creating multiple employees for that company. This requires thoughtful management of variable states across tasks, especially if you want to optimize the process by executing tasks in parallel.

In this guide, we will explore how to achieve this using the Locust framework, a powerful tool designed for load testing. We will break down the solution into clear steps, demonstrating how to efficiently reuse the company_id from the company creation task while creating employees in parallel.

The Problem: Sequential Task Management

Imagine you have the following situation:

Create a Company: This step generates a unique identifier (company_id).

Create Employees: Here, you need to pass on the company_id to ensure that each employee belongs to the correct organization.

In a straightforward approach, you might execute these in order, which can be inefficient as it doesn't take advantage of parallelism when creating multiple employees. What if you could offload this task to be executed in the background while still ensuring that company_id is correctly referenced? The solution lies in using Locust's capabilities effectively.

The Solution: Configuring Locust for Sequential and Parallel Execution

We can utilize Locust's SequentialTaskSet to enforce the order of execution while leveraging a connection pool to manage parallel requests for creating employees. Here's how to manage your tasks:

Step 1: Setting Up the Task Sequence

The first step is to define a task sequence where you can manage the state using class attributes.

[[See Video to Reveal this Text or Code Snippet]]

on_start Method: This initializes the necessary variables to store the company_id, workplace_id, and a list for employees.

Step 2: Creating the Company

Next, implement the function to create the company, which stores the unique identifier.

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Creating the Workplace

We will create another task to establish a workplace associated with the previously created company.

[[See Video to Reveal this Text or Code Snippet]]

Step 4: Creating Employees in Parallel

Now here’s where you can leverage parallel execution for your employee creation. Each employee will be created using a pool of workers that will act concurrently.

[[See Video to Reveal this Text or Code Snippet]]

Step 5: Complete User Class

Finally, bind your sequence of tasks to an HTTP user class:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion: The Benefits of Structured Parallel Tasks

This structure allows you to efficiently manage dependent tasks with shared state in Locust. By using both sequential task sets and connection pools, you gain the flexibility to create resources concurrently, thereby optimizing your load testing strategy.

Implementing such strategies in your testing design not only enhances performance but also ensures accuracy in your test scenarios, giving you the best insights into your application's capabilities under load.

Try this approach in your next task management scenario with Locust and watch how efficiently you can handle API testing!