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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
package main
import (
"context"
"fmt"
"log"
"net/http"
"github.com/gorilla/mux"
"go.opentelemetry.io/contrib/instrumentation/github.com/gorilla/mux/otelmux"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/attribute"
stdout "go.opentelemetry.io/otel/exporters/stdout/stdouttrace"
"go.opentelemetry.io/otel/propagation"
sdktrace "go.opentelemetry.io/otel/sdk/trace"
oteltrace "go.opentelemetry.io/otel/trace"
)
var tracer = otel.Tracer("mux-server")
func main() {
tp, err := initTracer()
if err != nil {
log.Fatal(err)
}
defer func() {
if err := tp.Shutdown(context.Background()); err != nil {
log.Printf("Error shutting down tracer provider: %v", err)
}
}()
r := mux.NewRouter()
r.Use(otelmux.Middleware("my-server"))
r.HandleFunc("/users/{id:[0-9]+}", http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
vars := mux.Vars(r)
id := vars["id"]
name := getUser(r.Context(), id)
reply := fmt.Sprintf("user %s (id %s)\n", name, id)
_, _ = w.Write(([]byte)(reply))
}))
http.Handle("/", r)
_ = http.ListenAndServe(":8080", nil) //nolint:gosec // Ignoring G114: Use of net/http serve function that has no support for setting timeouts.
}
func initTracer() (*sdktrace.TracerProvider, error) {
exporter, err := stdout.New(stdout.WithPrettyPrint())
if err != nil {
return nil, err
}
tp := sdktrace.NewTracerProvider(
sdktrace.WithSampler(sdktrace.AlwaysSample()),
sdktrace.WithBatcher(exporter),
)
otel.SetTracerProvider(tp)
otel.SetTextMapPropagator(propagation.NewCompositeTextMapPropagator(propagation.TraceContext{}, propagation.Baggage{}))
return tp, nil
}
func getUser(ctx context.Context, id string) string {
_, span := tracer.Start(ctx, "getUser", oteltrace.WithAttributes(attribute.String("id", id)))
defer span.End()
if id == "123" {
return "otelmux tester"
}
return "unknown"
}
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