#OpenTelemetry for Go

go get github.com/baselime/go-opentelemetry

package main

import (
	"context"
	baselime_opentelemetry "github.com/baselime/go-opentelemetry"
	"go.opentelemetry.io/otel"
	"go.opentelemetry.io/otel/attribute"
	otelMetric "go.opentelemetry.io/otel/metric"
	"log"
	"net/http"
	"os"
)

// Example tracer and counter
var tracer = otel.Tracer("flyio_tracer")
var reqCounter, _ = otel.Meter("your_service_name").Int64Counter("http.request")

func main() {
	// Initialise Baselime OTEL distro
	params := baselime_opentelemetry.Config{}
	otelShutdown, err := baselime_opentelemetry.ConfigureOpenTelemetry(params)
	if err != nil {
		log.Fatalf("error setting up OTel SDK - %e", err)
	}
	defer otelShutdown()

	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
		// Create new span for each request
		ctx, span := tracer.Start(r.Context(), "request-received")
		defer span.End()
		
		// Increment counter on each request, with path as an attribute
		reqCounter.Add(r.Context(), 1, otelMetric.WithAttributes(
			attribute.String("path", r.URL.Path),
		))
		
		// Step into function and produce nested span
		someCustomFunction(ctx)
	})
	log.Fatal(http.ListenAndServe(":"+port, nil))
}

// A function that produces its own span
func someCustomFunction(ctx context.Context) {
	ctx, span := tracer.Start(ctx, "get-data-environments")
	defer span.End()
}

BASELIME_API_KEY=your_api_key go run main.go

package main

import (
	"context"
	"github.com/aws/aws-sdk-go-v2/aws"
	"go.opentelemetry.io/contrib/instrumentation/github.com/aws/aws-sdk-go-v2/otelaws"
)

func main() {

	// init aws config
	cfg, err := aws.LoadDefaultConfig(context.TODO())
	if err != nil {
		panic("configuration error, " + err.Error())
	}

	// instrument all aws clients
	otelaws.AppendMiddlewares(&cfg.APIOptions)
}