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Jmeter-GCP-PubSub-Sampler

Introduction

This plugin adds feature to connect to GCP to publish/subscribe messages to the topic

Required Components

  1. Apache Jmeter/DI-Jmeter
  2. GCP Pubsub configs

Jar Dependencies Required

  • google-cloud-pubsub-1.111.2.jar
  • gson-2.2.4.jar

Jmeter Target

  • Jmeter version 5.3 or above
  • Java 8 or above

Installation Instructions

  • Download the source code from the Gitlab.
  • Just do a mvn clean install (Git bash is required)
  • Jar will be generated under the target directory (jmeter-pubsub-sampler-1.1.jar).
  • Copy the Jar to <Jmeter Installed Directory>/lib/ext/ for DI Jmeter <Jmeter Installed Directory>/di/plugins

How to use it

Add required config element (Publisher config/ Subscriber config)

  • Provide the required credentials information in the Publisher config/ Subscriber config for the project
  • To publish message, Add Publisher sampler to TG and then pass the message to publish
  • To receive message, Add Subscriber sampler to TG to read the mesasges

Publisher Info

Apart from config element, Publisher sampler has Gzip compression feature

  • The Flag in the sampler will allow the mechanism to publish the message with/without Gzip compression
  • On successful publish of each message, GCP returns a unique Id which will be returned in response header.
  • Supports attributes for messages being published
  • Supports multiple topic publishing feature in the same test plan

Subscriber Info

The subscriber works perfectly. The current mechanism of Subscriber is

  • The config elements creats a local queue to store the messages received from the GCP.
  • Currently the Queue size is hardcoded to 100K
  • The Subscriber sampler is bound to read it form the queue, which is already subscribed by the Message receiver(which is a separate client library's thread)
  • The subscriber sampler is reading and removing the message from the queue. In future, will change the ack to be done by the sampler.
  • When the susbcriber sampler is triggered and If there is no messages in the queue, It will wait until a new message arrive to process it.
  • each message retrieved from the subscriber will have the message ID and publish time info along with the message.
  • The message ID and publish time info will be returned in response headers and message on response body
  • The subscriber sampler supports De-Compression, If the message is in gzip compressed format.
  • Supports multiple topic subscription feature in the same test plan

Changes

  • Upgraded pub-sub client version to 1.111.2
  • Supports Attributes for sending messages
  • Supports multi-topic publishing, subscribing on same test plan

References

Below are the references which guided to build this plugin.

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