doytsujin / event-driven-example

An example Event-Driven application in Go built with Watermill library.

Event-Driven application example

This is an example Event-Driven application written in Go, using Watermill.

The projects aims to integrate incoming GitHub webhooks with Grafana and Slack, essentially adding annotations and sending messages when a new commit is pushed. There are also simulated deployment messages sent over RabbitMQ to demonstrate working with multiple event streams.

An example result can look like this:

Running

If you'd like to integrate the example with your Slack workspace, copy .env-example to .env and fill in the webhook URL in SLACK_WEBHOOK_URL variable.

In addition to the application, the docker-compose environment consists of:

• Kafka and ZooKeeper
• RabbitMQ
• Grafana
• Prometheus

The whole environment can be run with:

docker-compose up

You can now configure your GitHub repository to send webhooks to the application (you need to expose port 8080 to the external network first).

Alternatively, you can run ./scripts/send-stub-webhook.sh to send some stub webhooks.

Visit localhost:3000/d/webhooks to see annotations added in Grafana. Use admin:secret as credentials.

Metrics

You can access the Watermill dashboard at localhost:3000/d/watermill. See what changes when you send more webhooks over time.

What's next?

See Watermill's documentation to learn more.