mirror of
https://github.com/open-telemetry/opentelemetry-go.git
synced 2024-12-18 16:47:18 +02:00
94 lines
2.4 KiB
Go
94 lines
2.4 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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"context"
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"flag"
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"fmt"
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"io/ioutil"
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"log"
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"go.opentelemetry.io/otel/api/kv"
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"net/http"
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"time"
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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/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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url := flag.String("server", "http://localhost:7777/hello", "server url")
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flag.Parse()
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client := http.DefaultClient
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ctx := correlation.NewContext(context.Background(),
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kv.String("username", "donuts"),
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)
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var body []byte
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tr := global.Tracer("example/client")
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err := tr.WithSpan(ctx, "say hello",
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func(ctx context.Context) error {
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req, _ := http.NewRequest("GET", *url, nil)
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ctx, req = httptrace.W3C(ctx, req)
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httptrace.Inject(ctx, req)
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fmt.Printf("Sending request...\n")
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res, err := client.Do(req)
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if err != nil {
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panic(err)
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}
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body, err = ioutil.ReadAll(res.Body)
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_ = res.Body.Close()
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return err
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})
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if err != nil {
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panic(err)
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}
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fmt.Printf("Response Received: %s\n\n\n", body)
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fmt.Printf("Waiting for few seconds to export spans ...\n\n")
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time.Sleep(10 * time.Second)
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fmt.Printf("Inspect traces on stdout\n")
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}
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