go-http-server-with-otel/pkg/otel/settings.go

package otel

import "time"

type settings struct {
	EnableStdoutExporter     bool
	EnablePrometheusExporter bool
	MetricExportInterval     time.Duration
}

type Option interface {
	apply(*settings)
}

type enableStdoutExporter struct {
	Option
}

func (setting enableStdoutExporter) apply(o *settings) {
	o.EnableStdoutExporter = true
}

type enablePrometheusExporter struct {
	Option
}

func (setting enablePrometheusExporter) apply(o *settings) {
	o.EnablePrometheusExporter = true
}

type exportInterval struct {
	Option
	interval time.Duration
}

func (setting exportInterval) apply(o *settings) {
	o.MetricExportInterval = setting.interval
}