mirror of
https://github.com/open-telemetry/opentelemetry-go.git
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a485d0ec64
* Update License header for all source files - Add Apache 2.0 header to source files that did not have one. - Update all existing headers dated to 2019 to be 2020 - Remove comma from License header to comply with the Apache 2.0 guidelines. * Update Copyright notice Use the standard Copyright notices outlined by the [CNCF](https://github.com/cncf/foundation/blob/master/copyright-notices.md#copyright-notices)
77 lines
2.2 KiB
Go
77 lines
2.2 KiB
Go
// Copyright The OpenTelemetry Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package main
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import (
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"io"
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"log"
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"net/http"
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"go.opentelemetry.io/otel/api/correlation"
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"go.opentelemetry.io/otel/api/global"
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"go.opentelemetry.io/otel/api/trace"
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"go.opentelemetry.io/otel/exporters/trace/stdout"
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"go.opentelemetry.io/otel/plugin/httptrace"
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sdktrace "go.opentelemetry.io/otel/sdk/trace"
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)
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func initTracer() {
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// Create stdout exporter to be able to retrieve
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// the collected spans.
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exporter, err := stdout.NewExporter(stdout.Options{PrettyPrint: true})
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if err != nil {
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log.Fatal(err)
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}
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// For the demonstration, use sdktrace.AlwaysSample sampler to sample all traces.
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// In a production application, use sdktrace.ProbabilitySampler with a desired probability.
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tp, err := sdktrace.NewProvider(sdktrace.WithConfig(sdktrace.Config{DefaultSampler: sdktrace.AlwaysSample()}),
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sdktrace.WithSyncer(exporter))
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if err != nil {
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log.Fatal(err)
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}
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global.SetTraceProvider(tp)
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}
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func main() {
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initTracer()
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tr := global.Tracer("example/server")
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helloHandler := func(w http.ResponseWriter, req *http.Request) {
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attrs, entries, spanCtx := httptrace.Extract(req.Context(), req)
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req = req.WithContext(correlation.ContextWithMap(req.Context(), correlation.NewMap(correlation.MapUpdate{
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MultiKV: entries,
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})))
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ctx, span := tr.Start(
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trace.ContextWithRemoteSpanContext(req.Context(), spanCtx),
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"hello",
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trace.WithAttributes(attrs...),
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)
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defer span.End()
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span.AddEvent(ctx, "handling this...")
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_, _ = io.WriteString(w, "Hello, world!\n")
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}
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http.HandleFunc("/hello", helloHandler)
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err := http.ListenAndServe(":7777", nil)
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if err != nil {
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panic(err)
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}
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}
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