Mage Error

[hoptical]

Running mage command faces bellow error:

$ mage build:backend -v
# github.com/grafana/grafana-starter-datasource-backend/pkg/kafka_helper
pkg/kafka_helper/client.go:12:12: undefined: kafka.Consumer
pkg/kafka_helper/client.go:15:48: undefined: kafka.Consumer
pkg/kafka_helper/client.go:17:25: undefined: kafka.NewConsumer
pkg/kafka_helper/client.go:17:44: undefined: kafka.ConfigMap
pkg/kafka_helper/client.go:42:50: undefined: kafka.Event
pkg/kafka_helper/client.go:50:8: undefined: kafka.Message
pkg/kafka_helper/client.go:53:7: undefined: kafka.Error
pkg/kafka_helper/client.go:60:18: undefined: kafka.ErrAllBrokersDown
Error: running "go build -o dist/gpx_kafka-datasource_linux_amd64 -ldflags -w -s -extldflags "-static" -X 'main.commit=efe069bd4332485c723ec3c23116b6eaf04d918e' -X 'github.com/grafana/grafana-plugin-sdk-go/build.buildInfoJSON={"time":1636410898742,"version":"1.0.0","repo":"git@github.com:exaco/kafka-datasource.git","branch":"main","hash":"efe069bd4332485c723ec3c23116b6eaf04d918e"}' -X 'main.version=1.0.0' -X 'main.branch=main' ./pkg" failed with exit code 2

But its ok with the direct go build command and Grafana works with it successfully:
go build -o dist/gpx_kafka-datasource_linux_amd64 ./pkg

[marcusolsson]

I think you need to:

1. Update the package name in the go.mod file.
2. It seems like the kafka package requires cgo, to you'll need to enable it as well. Add the following to your Magefile.go:

var _ = build.SetBeforeBuildCallback(func(cfg build.Config) (build.Config, error) {
	cfg.EnableCGo = true
	return cfg, nil
})

Also looks like the kafka package isn't supported on Windows, so you might have some trouble building the Windows binary.

[hoptical]

@marcusolsson Thanks for your answer.
Yes, It worked after your suggested modifications.
So according to this link, we've below considerations with confluent-kafka-go package:

• To have GSSAPI/Kerberos authentication support, librdkafka should be installed separately and then build with -tags dynamic. Which I guess it's not applicable with the mage command and we've to use go build -tags dynamic -o dist/gpx_kafka-datasource_linux_amd64 ./pkg
• As you said the package doesn't support windows.
• For other operating systems like MacOSX, builds should be taken on the same OS and it's not feasible on Linux.

However, in future, we'll consider changing to other packages such as kafka-go or goka.