An exploration of messaging systems with Argo Events.
Implements two alternative EventBus technologies: Kafka and Pulsar. Both implementations enable horizontal scaling of Argo Event's Sensor applications, something not currently possible with vanilla Argo Events.
A slack incoming webhook is required to run both the Kafka and Pulsar implementations. Follow these instructions to set up a custom slack application with a webhook. Set the webhook URL as the SLACK environment variable when running the go program as described below.
To run the Kafka implementation you will need to have a local broker running on port 9092. The {event, trigger, action} topics will be automatically created if they do not exist. To play around with a different number of partitions you can run the following commands:
kafka-topics --bootstrap-server localhost:9092 --create --partitions 3 --topic event
kafka-topics --bootstrap-server localhost:9092 --create --partitions 3 --topic trigger
kafka-topics --bootstrap-server localhost:9092 --create --partitions 3 --topic action
To run the Pulsar implementation you will need to have a local broker running on port 6650. The {event, trigger, action} topics will be automatically created if they do not exist, but as non-partitioned topics. To create partitioned topics (as intended) you can run the following comands:
bin/pulsar-admin topics create-partitioned-topic -p 3 event
bin/pulsar-admin topics create-partitioned-topic -p 3 trigger
bin/pulsar-admin topics create-partitioned-topic -p 3 action
{"specversion": "1.0", "id": "1", "source": "es-1", "subject": "blue", "data": "blue"}
{"specversion": "1.0", "id": "2", "source": "es-2", "subject": "yellow", "data": "yellow"}
{"specversion": "1.0", "id": "3", "source": "es-3", "subject": "red", "data": "red"}EB=kafka SLACK=https://hooks.slack.com/services/xxx go run ./...
Multiple instances can be run simultaneously. Run the following command to produce test mesages:
kafka-console-producer --bootstrap-server localhost:9092 --topic event
> {"specversion": "1.0", "id": "1", "source": "es-1", "subject": "blue", "data": "blue"}
> {"specversion": "1.0", "id": "2", "source": "es-2", "subject": "yellow", "data": "yellow"}
> {"specversion": "1.0", "id": "3", "source": "es-3", "subject": "red", "data": "red"}
EB=pulsar SLACK=https://hooks.slack.com/services/xxx go run ./...
Multiple instances can be run simultaneously. Run the following commands to produce test mesages:
bin/pulsar-client produce event -s ,, -m '{"specversion": "1.0", "id": "1", "source": "es-1", "subject": "blue", "data": "blue"}'
bin/pulsar-client produce event -s ,, -m '{"specversion": "1.0", "id": "2", "source": "es-2", "subject": "yellow", "data": "yellow"}'
bin/pulsar-client produce event -s ,, -m '{"specversion": "1.0", "id": "3", "source": "es-3", "subject": "red", "data": "red"}'
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