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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 (
"fmt"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/exporters/jaeger"
"go.opentelemetry.io/otel/propagation"
"go.opentelemetry.io/otel/sdk/resource"
sdktrace "go.opentelemetry.io/otel/sdk/trace"
semconv "go.opentelemetry.io/otel/semconv/v1.10.0"
)
const (
service = "http-tracer-server1"
environment = "development" // "production" "development"
)
func initTracer() *sdktrace.TracerProvider {
exp, _ := jaeger.New(jaeger.WithAgentEndpoint(jaeger.WithAgentHost("127.0.0.1"), jaeger.WithAgentPort(fmt.Sprintf("%d", 6831))))
//exp, err := jaeger.New(jaeger.WithCollectorEndpoint(jaeger.WithEndpoint(url)))
// 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(exp),
sdktrace.WithResource(resource.NewWithAttributes(semconv.SchemaURL, semconv.ServiceNameKey.String(service))),
)
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 := otel_http.NewHandler(http.HandlerFunc(helloHandler), "Hello")
//
//http.Handle("/hello", otelHandler)
//err := http.ListenAndServe(":7777", nil)
//if err != nil {
// panic(err)
//}
}