TODO List

That's a simples CRUD of a Todo card. The main purpose is to exercise somethings and also learn others.

What you'll find here?

• Go
• Docker
• Rest API
• Postgres
• OpenTelemetry
• Prometheus (soon..)
• Grafana (soon..)
• Kubernetes (soon..)
• Kong API Gateway (soon..)

How to run in Docker

You must have docker and docker compose installed on your machine

To start the database and application run, if running in a linux with make installed run:

make start and to shut down server make stop

If you don't have make on your system then run from the root folder:

docker compose up -f build/docker-compose.yaml to start the database and application

and docker compose down -f build/docker-compose.yaml to stop.

How to run in K8S with Kind

You'll also need to have docker installed on your machine. Further information soon.

Tips

Before the following code it's necessary to configure the TextMapPropagator just like this:

otel.SetTextMapPropagator(propagation.NewCompositeTextMapPropagator(propagation.TraceContext{}, propagation.Baggage{}))

Here's a reference link to link for b3.

Now, if needed to pass the open telemetry headers (w3c,b3,..) you can use the following code, i'm using resty to do the http call, but the relevant part is related to otel.

    url := "your_url"
    client := resty.New()
	req := client.
		R().
		SetContext(ctx).
		EnableTrace()
	
	// the magic happens here
	otel.GetTextMapPropagator().Inject(ctx, propagation.HeaderCarrier(req.Header))
	resp, err := req.Get(url)

Observability

Name	Url
Jaeger	http://localhost:16686/
Prometheus	http://localhost:9090/
Grafana	http://localhost:3000/