observer/pkg/tracer/middleware.go

package tracer

import (
	"context"
	"fmt"
	"github.com/gofiber/fiber/v2"
	fiberOpentelemetry "github.com/psmarcin/fiber-opentelemetry/pkg/fiber-otel"
	"go.opentelemetry.io/otel/attribute"
	trace "go.opentelemetry.io/otel/trace"
	"runtime"
)

func Handler(fc *fiber.Ctx) (context.Context, trace.Span) {
	spanName := fmt.Sprint(fc.OriginalURL())
	simpleCtx, span := fiberOpentelemetry.Tracer.Start(fc.UserContext(), spanName)

	fc.SetUserContext(simpleCtx)

	_, file, line, _ := runtime.Caller(1)
	span.SetAttributes(
		attribute.String("service.layer", "handler"),
		attribute.String("file", file),
		attribute.String("line", fmt.Sprintf("%d", line)),
	)

	return simpleCtx, span
}

func Service(c context.Context, spanName string) (context.Context, trace.Span) {
	simpleCtx, span := fiberOpentelemetry.Tracer.Start(c, spanName)
	var attribs []attribute.KeyValue

	_, file, line, _ := runtime.Caller(1)
	attribs = append(
		attribs,
		attribute.String("service.layer", "service"),
		attribute.String("file", file),
		attribute.String("line", fmt.Sprintf("%d", line)),
	)

	span.SetAttributes(attribs...)

	return simpleCtx, span
}

func Repository(c context.Context, spanName string) (context.Context, trace.Span) {
	ctx2, span := fiberOpentelemetry.Tracer.Start(c, spanName)
	var attribs []attribute.KeyValue

	_, file, line, _ := runtime.Caller(1)
	attribs = append(attribs,
		attribute.String("file", file),
		attribute.String("line", fmt.Sprintf("%d", line)),
	)
	span.SetAttributes(attribs...)

	return ctx2, span
}