Use JMeter The test is based on WebSocket Agreed services

One 、WebSocket What is it? ？

Example ：WebSocket It is a two-way network communication protocol , And HTTP Different , It uses ws:// or wss:// start . It's a stateful protocol , This means that the connection between the client and the server will remain active , Until the connection is closed by either the client or the server , The connection will terminate at both ends .

Two 、 Why WebSocket

For the first time contact WebSocket People who , They all ask the same questions ： We already have HTTP agreement , Why another agreement is needed ？ What benefits can it bring ？

The answer is simple , because HTTP There is a flaw in the agreement ： Communication can only be initiated by the client .

for instance , We want to know the weather today , Only the client can make a request to the server , The server returns the query result .HTTP The protocol can't make the server actively push information to the client .

This one-way request feature , Doomed if the server has continuous state changes , It is very difficult for the client to know . We can only use " polling ", Every once in a while , Just send out an inquiry , Find out if the server has any new information . Polling is inefficient , It's a huge waste of resources . therefore , Engineers have been thinking , Is there a better way ,WebSocket That's how it was invented .

WebSocket The most important feature of the game is , The server can actively push information to the client , The client can also send information to the server , It's really a two-way equal dialogue , This is a type of server push technology .

3、 ... and 、WebSocket Sampler Simple use

1. install WebSocket Plug ins and dependency packages

Method 1：
open JMeter After the plug-in manager , Click on Available Plugins Options page , Type in the search box WebSocket, Then choose install WebSocket Sampler by Maciej Zaleski plug-in unit


Method 2： Copy downloaded jar Package to jmeter Of /lib/ext Under the table of contents , And restart jmeter
JMeterWebSocketSamplers-1.2.8.jar
jmeter-websocket-samplers-source

2. Add sampler

WebSocket Sampler How to add components ： Choose “ Thread group ” Right click —> add to —> Sampler —> WebSocket Sampler
Add a sampler according to the needs of the scene , Can be added websocket There are seven kinds of samplers ：
1）WebSocket Close —— close ws Connect
2）WebSocket Open Connection —— open ws Connect
3）WebSocket Ping/Pong —— ping/pong heartbeat , Check whether the connection still exists
4）WebSocket Sampler
5）WebSocket Single Read Sampler —— Only receive responses （ Message push ）
6）WebSocket Single Write Sampler —— Send only requests
7）WebSocket request-response Sampler —— Send request and receive response

The interface is shown in the figure below ：

3.WebSocket Sampler Detailed explanation of sampler interface

Description of the options in the interface ：

name ：WebSocket Sampler The custom name of the component , It's best to see the name and know the meaning .
notes ： That is to add some remarks , For the WebSocket Sampler A brief description of the component , For later review .
（1）WebServer

Server Name or IP： The destination server that sent the request IP Address or domain name .
Port Number： The port number after the server address , If yes, fill in , No need to fill in .
（2）Timeout (milliseconds)

Connection： Maximum timeout for link establishment , Unit millisecond . If the link is not established after the timeout is set , be sampler Failure .

Response ： The maximum waiting time for a response message , Unit millisecond . After reaching the set time WebSocket Link off .

（3）WebSocket Request

Implementation： Only support RFC6455(v13) ,WebSocket The latest version of the protocol standard .
Protocol： Yes ws And wss Points .ws The prefix is WebSocket Identification of the connection ,wss The prefix is WebSocket Identification of secure connections . Fill in according to the actual situation of the interface you need to access .
Content encoding： Content encoding . It is recommended to write in Chinese UTF-8.
Connection Id： Connect ID.
Path： The path to the access interface .
Ignore SSL certificate errors： Ignore SSL Certificate error .
Streaming connection： choice TCP session Do you want to keep , If you tick the logo, the connection will always exist , If it doesn't tick , Then the link will be closed after the first response .
（4） Send the parameters with the request

Can be filled in key-value Parameters of form .（ It doesn't seem to work very well , The request parameters are filled in below Request data In the! ）
Request data： Fill in the parameters sent with the request , And HTTP The sampler is similar to , Configure the interface according to the description document of the tested interface .
（5）Web Socket Response： Interface response related settings

Response pattern： The sampler will wait for the message containing the ID and continue to communicate （ Or until timeout, The connection is closed ）

Close connection pattern： If the message returned by the server contains filled characters , Just end the conversation .

Proxy Server (currently not supported by Jetty)： Edit proxy server information （ Currently does not support Jetty）

Server Name or IP： The server IP Address or domain name .

Port Number： Port number .

Username： user name .

Password： password .

Message Backlog： Define the maximum length of messages returned by the server .

4.WebSocket Sampler Interface example

（1） Edit the information in the sampler

（2） add to —> Monitor —> Look at the fruit tree

（3） Run view results

Four 、 Set the sampler sequence mode

Set the sequence of sampler execution , It's usually ：
1） Use WebSocket Open Connection, establish ws Connect ;
2） Use WebSocket Single Write Sampler, Request subscription related data ;
3） Use WebSocket Single Read Sampler, Receive message push ;
4） Use WebSocket Ping/Pong, Determine long connection ;
5） Use WebSocket Close, close ws Connect .
notes ：WebSocket request-response Sampler Both request and response functions , Choose according to your needs .

1.WebSocket Open Connection

Set up ws Related connection information ：

2.WebSocket Single Write Sampler

Use an existing connection , Send subscription request ：

3.WebSocket Single Read Sampler

Use an existing connection , Receive message push ：

4.WebSocket Ping/Pong

The heartbeat detection ：

5.WebSocket Close

close ws Connect ：

6. function , View the result tree

summary

above , Just the whole content I share with you this time , If you think it's good , Please leave a like ！ Of course, I'm looking forward to your reward
If you have any ideas , Welcome to contact me ～