mirror of
https://github.com/open-telemetry/opentelemetry-go.git
synced 2025-04-21 11:57:04 +02:00
84 lines
2.2 KiB
Go
84 lines
2.2 KiB
Go
// Copyright 2019, 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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"os"
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"go.opentelemetry.io/api/distributedcontext"
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"go.opentelemetry.io/api/trace"
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"go.opentelemetry.io/exporter/trace/stackdriver"
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"go.opentelemetry.io/global"
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"go.opentelemetry.io/plugin/httptrace"
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sdktrace "go.opentelemetry.io/sdk/trace"
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)
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func initTracer() {
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projectID := os.Getenv("PROJECT_ID")
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// Create Stackdriver exporter to be able to retrieve
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// the collected spans.
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exporter, err := stackdriver.NewExporter(
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stackdriver.WithProjectID(projectID),
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)
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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.TraceProvider().GetTracer("stackdriver/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(distributedcontext.WithMap(req.Context(), distributedcontext.NewMap(distributedcontext.MapUpdate{
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MultiKV: entries,
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})))
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ctx, span := tr.Start(
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req.Context(),
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"hello",
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trace.WithAttributes(attrs...),
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trace.ChildOf(spanCtx),
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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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