🚀 Module 3: Managing Your Container Workspace

Technology Stack:

• Python
• DevSpaces
• Kafka

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🎯 Scenario

Inside this workspace is a Python Application that connects to an Openshift Kafka Cluster. There are 3 commands you can run from within the application.

# Run the producer
python producer.py --topic <name_of_topic>

# Run the consumer
python consumer.py --topic <name_of_topic>

# Run the WebAPP
uvicorn main:app --host 0.0.0.0 --port 8000 --reload

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🐾 Guided Walkthrough

The application has some problems that we would like you to fix:

1. Run pip install -r requirements.txt to install the necessary dependencies
2. Set the KAFKA_BOOTSTRAP_SERVERS environment variable based on the kafka cluster you created
3. In a separate browser window open: https://devfile.io/docs/2.3.0/quickstart-che as a reference
4. Create a new devfile (devfile.yaml) in the project root

• 4.1. Point to the python UDI image - registry.access.redhat.com/ubi9/python-39:1-1739420387
• 4.2. Configure memory and CPU
• 4.3. Do not rely on CLI Anymore!
  • 4.3.1. Create a build task for installation
  • 4.3.2. Create a run task for consumer.py
  • 4.3.3. Create a run task for producer.py
  • 4.3.4. Create a run task for main.py
• 4.4. Set the KAFKA_BOOTSTRAP_SERVERS environment variable to the kafka instance you created

5. Create a new topic in the producer command named today

• 5.1. Add 7-8 messages in there

6. Run the consumer command and point the topic to today

• 6.1. Verify messages are funneling through

7. Run the web application (if you have built a command for main.py you can use that)

• 7.1. In the topics input, put today and verify messages are funnelling through

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🧩 Challenge

• Add your devfile tasks to the tasks.json
• Load 3 python extensions into a .vscode/extensions.json file
• Write a few small unit tests using mocks for the Kafka producer to verify that your logic (like input handling and retry mechanisms) works as expected without needing a real Kafka cluster.

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🥚 Easter Eggs!

• There is an easter egg in the code
  • Be thorough! Look through the code.

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✅ Key Takeaways

• Built your first devfile!
• Configured your devspaces / odo workspace
• Customized your vscode environment
• First Interaction with Streams for Apache Kafka
• Introductory patterns around Event Driven Architecture