How to write Locust test scripts using Golang

In the distributed load testing tool Locust, Python is the most commonly used scripting language, but some people want to use other languages ​​​​to write Locust test scripts. Among them, Golang is a popular choice because its performance is superior to Python.

In this article, we will explore how to write Locust test scripts using Golang, and how to run these scripts.

Install Locust and Golang

Before you start writing test scripts, you need to install Locust and Golang locally. First, you need to install Python and use pip to install Locust. The installation method is as follows:

pip install locust

Then, you need to install Golang. Binaries for the native operating system can be downloaded and installed from [Golang official website](https://golang.org/dl/). After the installation is complete, you can use the following command to verify whether Golang is installed correctly:

go version

If the version number of Golang is displayed, the installation is successful.

Writing Locust test script

Basic structure

Before you start writing the test script, you need to understand the basic structure of the Locust test script. Test scripts usually consist of the following parts:

1. Import the necessary packages and libraries
2. Define the Locust task
3. Define the Locust user
4. Definition User behavior

The following is a simple example:

package main

import (
    "github.com/astaxie/beego/httplib"
    "github.com/locustio/locust/clients"
    "github.com/locustio/locust/locust"
)

type MyTaskSet struct{}

func (ts *MyTaskSet) SetupTest(user *locust.User) {
    // 可以在此处进行用户级别的初始化操作
}

func (ts *MyTaskSet) TeardownTest(user *locust.User) {
    // 可以在此处进行用户级别的清理操作
}

func (ts *MyTaskSet) YourTaskName(c *clients.SyncClient, user *locust.User) {
    req := httplib.Get("http://www.example.com")
    resp, err := req.String()
    if err != nil {
        panic(err)
    }
}

func main() {
    locust.RunLocust(&locust.Locust{
        Host: "http://www.example.com",
        TaskSet: &MyTaskSet{},
    })
}

The above code defines a task named "MyTaskSet", which contains the user's initialization and cleanup operations, as well as a A task named "YourTaskName" that will make an HTTP GET request to "http://www.example.com".

Writing test scripts using Golang

When using Golang to write Locust test scripts, you need to use the locust library and clients library. The locust library provides the functions of creating Locust users, executing task sets, and recording statistical information during test runs; the clients library provides functions such as sending HTTP requests and establishing WebSocket connections.

In the above example, the RunLocust() method of the locust library is used to start the test, and MyTaskSet is passed to the method as the task set. During this process, the locust library assigns each task defined in MyTaskSet to the Locust user for execution.

Run the test script

After completing the writing of the test script, you can use the following command to run the Locust test:

go run locustfile.go --host=http://www.example.com

Among them, locustfile.go is the file containing the test script name, the --host parameter specifies the target host address for the test.

After the test starts running, you can access http://localhost:8089 to enter the Locust web interface and monitor the test results. For more detailed introduction to Locust, please refer to [Official Documentation](https://docs.locust.io/).

Conclusion

Using Golang to write Locust test scripts makes the test scripts have higher performance and scalability. In this article, we discuss how to write Locust test scripts using Golang, showing a simple but complete example. By learning this knowledge, you will have a deeper understanding of the Locust testing tool and its working principle, and you will be more comfortable applying it in load testing.

The above is the detailed content of How to write Locust test scripts using Golang. For more information, please follow other related articles on the PHP Chinese website!