/
server.go
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/
server.go
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// Copyright The OpenTelemetry Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package main
import (
"context"
"io"
"log"
"net/http"
"go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/baggage"
stdout "go.opentelemetry.io/otel/exporters/stdout/stdouttrace"
"go.opentelemetry.io/otel/propagation"
"go.opentelemetry.io/otel/sdk/resource"
sdktrace "go.opentelemetry.io/otel/sdk/trace"
semconv "go.opentelemetry.io/otel/semconv/v1.4.0"
"go.opentelemetry.io/otel/trace"
)
func initTracer() *sdktrace.TracerProvider {
// Create stdout exporter to be able to retrieve
// the collected spans.
exporter, err := stdout.New(stdout.WithPrettyPrint())
if err != nil {
log.Fatal(err)
}
// For the demonstration, use sdktrace.AlwaysSample sampler to sample all traces.
// In a production application, use sdktrace.ProbabilitySampler with a desired probability.
tp := sdktrace.NewTracerProvider(
sdktrace.WithSampler(sdktrace.AlwaysSample()),
sdktrace.WithBatcher(exporter),
sdktrace.WithResource(resource.NewWithAttributes(semconv.SchemaURL, semconv.ServiceNameKey.String("ExampleService"))),
)
otel.SetTracerProvider(tp)
otel.SetTextMapPropagator(propagation.NewCompositeTextMapPropagator(propagation.TraceContext{}, propagation.Baggage{}))
return tp
}
func main() {
tp := initTracer()
defer func() {
if err := tp.Shutdown(context.Background()); err != nil {
log.Printf("Error shutting down tracer provider: %v", err)
}
}()
uk := attribute.Key("username")
helloHandler := func(w http.ResponseWriter, req *http.Request) {
ctx := req.Context()
span := trace.SpanFromContext(ctx)
bag := baggage.FromContext(ctx)
span.AddEvent("handling this...", trace.WithAttributes(uk.String(bag.Member("username").Value())))
_, _ = io.WriteString(w, "Hello, world!\n")
}
otelHandler := otelhttp.NewHandler(http.HandlerFunc(helloHandler), "Hello")
http.Handle("/hello", otelHandler)
err := http.ListenAndServe(":7777", nil)
if err != nil {
panic(err)
}
}