mirror of
https://github.com/open-telemetry/opentelemetry-go.git
synced 2024-12-14 10:13:10 +02:00
114 lines
3.1 KiB
Go
114 lines
3.1 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 othttp_test
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import (
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"context"
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"fmt"
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"io"
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"io/ioutil"
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"log"
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"net/http"
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"strings"
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"go.opentelemetry.io/otel/api/core"
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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/exporter/trace/stdout"
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"go.opentelemetry.io/otel/plugin/othttp"
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sdktrace "go.opentelemetry.io/otel/sdk/trace"
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)
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func ExampleNewHandler() {
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/* curl -v -d "a painting" http://localhost:7777/hello/bob/ross
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...
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* upload completely sent off: 10 out of 10 bytes
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< HTTP/1.1 200 OK
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< Traceparent: 00-76ae040ee5753f38edf1c2bd9bd128bd-dd394138cfd7a3dc-01
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< Date: Fri, 04 Oct 2019 02:33:08 GMT
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< Content-Length: 45
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< Content-Type: text/plain; charset=utf-8
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<
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Hello, bob/ross!
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You sent me this:
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a painting
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*/
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// Write spans to stdout
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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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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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figureOutName := func(ctx context.Context, s string) (string, error) {
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pp := strings.SplitN(s, "/", 2)
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var err error
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switch pp[1] {
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case "":
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err = fmt.Errorf("expected /hello/:name in %q", s)
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default:
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trace.CurrentSpan(ctx).SetAttributes(core.Key("name").String(pp[1]))
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}
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return pp[1], err
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}
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var mux http.ServeMux
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mux.Handle("/hello/",
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othttp.WithRouteTag("/hello/:name", http.HandlerFunc(
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func(w http.ResponseWriter, r *http.Request) {
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ctx := r.Context()
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var name string
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// Wrap another function in it's own span
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if err := trace.CurrentSpan(ctx).Tracer().WithSpan(ctx, "figureOutName",
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func(ctx context.Context) error {
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var err error
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name, err = figureOutName(ctx, r.URL.Path[1:])
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return err
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}); err != nil {
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log.Println("error figuring out name: ", err)
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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d, err := ioutil.ReadAll(r.Body)
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if err != nil {
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log.Println("error reading body: ", err)
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w.WriteHeader(http.StatusBadRequest)
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return
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}
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n, err := io.WriteString(w, "Hello, "+name+"!\nYou sent me this:\n"+string(d))
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if err != nil {
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log.Printf("error writing reply after %d bytes: %s", n, err)
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}
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}),
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),
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)
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if err := http.ListenAndServe(":7777",
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othttp.NewHandler(&mux, "server",
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othttp.WithMessageEvents(othttp.ReadEvents, othttp.WriteEvents),
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),
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); err != nil {
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log.Fatal(err)
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}
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}
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