JMeter websocket interface test

Preface

In a website , A lot of data needs to be updated immediately , For example, user assets of futures trading . In the past , The implementation of this function generally uses http polling , That is, the client sends a query request to the server every other period of time with a scheduled task to obtain the latest value . The disadvantages of this method are obvious ：

It may cause data update not in time , If the front-end polling frequency is 5s, Maybe the data is here 5s It has been updated many times .

It may cause additional pressure on the database , For example, a user asset does not change for a long time , But the client still needs to query regularly , Such meaningless queries account for a high proportion , Put unnecessary pressure on the server .

There are two interactions of request and response , Increased time consumption , and http The request may carry a large number of header Information , Increase the occupation of network bandwidth

HTML5 Start by offering one in a single TCP A protocol for full duplex communication on a connection -WebSocket, Well solved http Disadvantages of polling .

stay WebSocket API in , All browsers and servers need to do is shake hands , then , This creates a fast channel between the browser and the server . Data can be transmitted directly between the two .

in other words ,http Polling mechanism , The initiative is entirely on the client , and WebSocket In mechanism , The initiative can be handed over to the server , Data push can be more accurate , Including when to push （ Regular push or update push ）, What data to push .

preparation
JMeter It can be carried out very conveniently WebSocket The interface test , However, the following dependencies need to be introduced ：

jetty-http

jetty-io

jetty-util

websocket-api

websocket-client

websweocket-common

Dependent downloads ：

https://pan.baidu.com/s/1PTOyTBzmOwLPNhxB-TxR7g , Extraction code ：uq25

The following is based on JMeter5.1.1

Will be related to jar Put in bags JMeter Installation directory /lib/etc in , restart JMeter. In the sampler , You can see more than before websweocket Relevant sampler .

scripting
Before writing a script , First, we need to understand the logic of push service , Its logic is like this ：

First , The client sends the request to the server , Establishing a connection

Once the connection is established , The client needs to send to the server regularly ping-pong news , Keep your heart beating

The client sends a request to actively disconnect , The server disconnects the connection

Establishing a connection , Use 【WebSocket request-response Sampler】, seeing the name of a thing one thinks of its function , This sampler can send requests and receive responses .

Explain the contents ：

Connection： Yes use existing connection and setup new connection Two modes , The former uses existing connections , The last one websocket Request the established connection channel , After selection Server URL All grayed out, read-only, and inoperable . The latter refers to the new connection channel .

Server URL：ws The protocol and wss（ Encrypted websocket） Optional ,sever name or IP（ Server address ）、Port（ Port number ）、Path（ route ）、Connection timeout（ Connection timeout ） These meanings are also very clear .

Data： send data , You can choose Text（ Text , Include JSON） and Binary（ Binary system ） form , You can also check Read request data from file To get from the file data.

This request should be the same thread as the connection request , And run regularly , Therefore, the script structure is designed as follows ：

Pay attention to two points ：

1. Want to build 3000 If there's a connection , It must be 【 Number of threads 】 Set to 3000, The number of cycles is set to 1, Not the opposite , This is easily confused by many people .

2.【Ramp-up Time 】 This parameter is the start time of all threads , If you want to put more instantaneous pressure on the server , Just set the time shorter . Through the measured , If this time is too short , Finally, the number of successful connections will be significantly less than that set 【 Number of threads 】, So the setting is usually longer .

General websocket Push service , Will design a timed heartbeat detection mechanism , That is, the client sends a specific message to the server regularly , In this way, the server will maintain this connection , Otherwise , The client is determined to be inactive by the server and disconnected . therefore , In order to keep our script running , You need to add a heartbeat detection request .

Because the number of thread cycles is 1 Time （ Many times , A thread repeatedly establishes a connection ）, So we have to put 【 The heartbeat detection 】 Put it into a cycle controller .
and 【 Fixed timer 】 The role of , It's control 【 The heartbeat detection 】 Frequency of transmission ：

The heartbeat detection ：

Pay special attention to two points ：

1.Connection Items must be selected use existing connection, Indicates the connection established by this thread , Otherwise, the connection will be re created .

2.Request data It depends on the implementation of the server .

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