robinhodemorais / card-transactions

kafka based card transactions simulator and other small processor apps to simulate an end-to-end credit card transaction event flow

Card transactions demo

This is an end-to-end demo that implements some contrived event flows related to credit card transactions.

Uses

• kafka-node
• Solace PubSub+ Connector for Kafka: Sink
• MQTT.js

Event Portal Link for Solace SEs

https://console.solace.cloud/event-designer/domains/32utcxr6mf2p

Event Portal Application Domain Graph

Architecture Diagram

Staging the demo environment

You'll need to start a local Solace software broker, a Solace Cloud messaging service, and get Kafka, ZooKeeper, and the Solace PubSub+ Kafka Connector: Sink running locally.

Follow the documentation found on the Sink Connector's GitHub page to get up and running with everything Kafka related.

When you have Kafka up and running, create a new topic using a more descriptive name than "test" by running this command:

bin/kafka-topics.sh --create --bootstrap-server localhost:9092 --replication-factor 1 --partitions 1 --topic card-transaction

Make these associated change in the etc/solace_sink.properties of the PubSub+ Kafka Sink Connector:

topics=card-transaction
sol.topics=PII/CardTransaction

Running the applications

First, clone the repo and cd into its root directory:

git clone https://github.com/solacese/card-transactions.git
cd card-transactions

If you look at the contents of the applications directory, you'll find four small Node.js applications that do some basic transformations and phony business logic to make the event flows look real:

• card-transactions-publisher
• scrubber
• fraud-detector
• trend-detector

There's a README for each application, but they're all pretty much the same:

cd <application directory>
npm i
npm run start