英文:
How to write request in Jmeter to test SignalR hub
问题
我在我的SignalR hub中有一个非常简单的方法：
public class ActivityHub : Hub
{
public async Task NewMessage(string username, string message) =>
await Clients.All.SendAsync("ReceiveMessage", username, message);
}
当我使用我的客户端（也是用JavaScript编写的非常简单的应用程序）时，它能够完美地工作。
我的问题是如何通过Jmeter测试我的hub。我已经在stackoverflow上找到了一些相关主题，以及一个很好的教程：
https://medium.com/@goldberg_rui/test-signalr-performance-with-jmeter-59083554f917
我编写了一个简单的测试，但它不起作用。我像教程中一样使用了"WebSocket Samplers by Peter Doornbosch"。
首先，我进行协商（简单的HTTP请求）：
http://localhost:56325/activity/negotiate，这个请求返回一些数据，我从中提取了connectionId。
然后，我打开一个新的连接（WebSocket Open Connection）到/activity?id=$(ConnectionId)。
最后，我尝试使用现有的连接调用我的hub中的方法（WebSocket Single Write Sampler），并且我放入了数据：
{"arguments": ["abc","abc"], "invocationId":123,"target":"NewMessage","type":4}
不幸的是，我收到了带有以下消息的错误：
响应代码：Sampler错误
响应消息：配置为使用现有连接的Sampler，但没有连接
我的测试中有什么问题？我知道我需要在消息末尾添加终止字符0x1E，这一点我已经做了。也许消息的类型（4）不正确，或者参数传递错误？
我还放置了我的JMeter测试的屏幕截图。
重要提示：只启用了第二个写入器，第一个写入器被禁用。
英文:
I have very simple method in my SignalR hub:
public class ActivityHub : Hub
{
public async Task NewMessage(string username, string message) =>
await Clients.All.SendAsync("ReceiveMessage", username, message);
}
It works perfectly when I use my client (also very simple application written in JavaScript)
The clue of my question is to find how to test my hub via Jmeter. I found already some topics on stackoverflow, and well tutorial:
https://medium.com/@goldberg_rui/test-signalr-performance-with-jmeter-59083554f917
I wrote simple test, but it doesn't works. I used “ WebSocket Samplers by Peter Doornbosch” as in tutorial.
Firstly I negotiate (simple HTTP Request):
http://localhost:56325/activity/negotiate that returns me some data I extract connectionId from.
Then I open new connection (WebSocket Open Connection) with /activity?id=$(ConnectionId).
On the end I trying to invoke method (WebSocket Single Write Sampler) in my hub with existing connection, and I put data: {"arguments": ["abc","abc"], "invocationId":123,"target":"NewMessage","type":4}. Unfortuantely i getting errors with message:
Response code:Sampler error
Response message:Sampler configured for using existing connection, but there is no connection
Where Is bug in my test? I know that I need to add terminating character 0x1E at the end of the message what I have done. Maybe type of message (4) is not proper or arguments are wrongly paassed?
I also put screenshots of my JMeter test.
Important: Only second writer is enabled, the first one is disabled.
答案1
得分: 1
你的设置看起来不错，然而错误消息意味着连接未打开，所以我的期望是你的WebSocket Open Connection采样器在某个地方出现了问题。
- 使用查看结果树监听器来检查请求和响应，并将它们与JavaScript发送的内容进行比较。
- 检查jmeter.log文件是否有可疑条目，因为从你JMeter GUI右上角的黄色感叹号看，至少有2个需要修复的错误。你还可以考虑通过将下一行添加到log4j2.xml文件来增加WebSocket采样器的JMeter调试日志详细程度至DEBUG级别：
<Logger name="eu.luminis" level="debug" />
需要重新启动JMeter才能应用此更改。
英文:
Your setup looks good, however the error message means that the connection is not open so my expectation is that your WebSocket Open Connection sampler fails somewhere somehow.
-
Use View Results Tree listener to inspect request and response and compare them with the ones sent by JavaScript
-
Check jmeter.log file for any suspicious entries as looking into yellow exclamation sign at upper right corner of your JMeter GUI it looks like there are at least 2 errors which need to be fixed. You can also consider increasing JMeter debug logging verbosity to DEBUG level for the websocket samplers by adding the next line to log4j2.xml file:
<Logger name="eu.luminis" level="debug" />JMeter restart will be required to pick up the change
答案2
得分: 0
已找到。
将正则表达式提取器更改为JSON提取器，并将Json Path Expression设置为$.connectionId。
其余测试正常。
英文:
Found.
Change RegEx Extractor to JSON Extractor and set Json Path Expression as $.connectionId.
The rest of test was ok.
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