Generate and emit CloudEvents

[penguineer]

This pull request introduces CloudEvents support to the application, enabling sensor data to be emitted as CloudEvents messages over MQTT. The changes include updates to the documentation, new functionality for generating and emitting CloudEvents, and modifications to existing code to integrate this feature.

Documentation Updates:

• README.md: Added details about new environment variables (CE_SOURCE, CE_TYPE, CE_MQTT_TOPIC) for CloudEvents configuration, and documented the CloudEvents message structure and attributes. [1] [2]

CloudEvents Integration:

• cloudevents.py: Introduced the CloudEventGenerator class to create CloudEvents messages based on the CloudEvents specification.
• sensor_data_event.py: Added methods to SensorDataEvent for converting sensor data into CloudEvents format and retrieving the topic.

Application Logic Changes:

• app.py:
  • Imported CloudEventGenerator and added a utility function create_cloudevent_generator to initialize it with environment variables. [1] [2]
  • Added the emit_cloudevent function to publish CloudEvents messages to MQTT.
  • Integrated CloudEvents emission into the main application loop, alongside existing sensor data emission.
  • Updated the main function to handle the new CloudEvents topic (CE_MQTT_TOPIC) and generator.

[Copilot]

Pull Request Overview

This PR adds CloudEvents support, allowing sensor data to be emitted as CloudEvents messages over MQTT. Key changes include:

• Addition of the CloudEventGenerator in cloudevents.py for generating CloudEvents.
• Enhancements to SensorDataEvent to provide CloudEvent data and topic information.
• Updates in app.py to create a CloudEvent generator and emit CloudEvents alongside sensor data, plus corresponding documentation updates in README.md.

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
sensor_data_event.py	Introduces methods to format sensor data as CloudEvent payloads.
cloudevents.py	Adds the CloudEventGenerator class to generate CloudEvents.
app.py	Integrates CloudEvents emission into the main loop and adds utility functions.
README.md	Updates documentation to include CloudEvents configuration and payload details.

Comments suppressed due to low confidence (1)

app.py:150

• The json module is used to dump the CloudEvent payload but is not imported in the diff context. Consider adding 'import json' at the beginning of the file.

payload = json.dumps(ce)

[Copilot]

Pull Request Overview

This pull request integrates CloudEvents support into the application to allow sensor data to be emitted as CloudEvents messages over MQTT. It updates the documentation, adds the CloudEventGenerator class and helper methods to convert and emit sensor events as CloudEvents, and integrates these changes into the main application loop.

• Added new methods in SensorDataEvent to generate CloudEvents data and retrieve sensor topics.
• Introduced CloudEventGenerator in cloudevents.py and integrated CloudEvent emission in app.py.
• Updated README.md to document new CloudEvents configuration variables and message structure.

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
sensor_data_event.py	Added methods to generate CloudEvents data and to retrieve topics.
cloudevents.py	Introduced CloudEventGenerator for creating CloudEvents messages.
app.py	Added functions to create a CloudEventGenerator and emit CloudEvents.
README.md	Updated documentation with CloudEvents environment variables and message format.

Comments suppressed due to low confidence (1)

app.py:51

• [nitpick] The comment refers to 'configuration event_type', but since this dictionary holds provider configuration fields, it could be clearer if the comment mentioned 'configuration type'. Consider changing it back to 'Define required fields for each configuration type'.

# Define required fields for each configuration event_type