mirror of
https://github.com/open-telemetry/opentelemetry-go.git
synced 2025-01-28 03:57:09 +02:00
117 lines
3.3 KiB
Go
117 lines
3.3 KiB
Go
// Copyright 2019, 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 othttp_test
|
|
|
|
import (
|
|
"context"
|
|
"fmt"
|
|
"io"
|
|
"io/ioutil"
|
|
"log"
|
|
"net/http"
|
|
"strings"
|
|
|
|
"go.opentelemetry.io/api/core"
|
|
"go.opentelemetry.io/api/trace"
|
|
"go.opentelemetry.io/exporter/trace/stdout"
|
|
"go.opentelemetry.io/plugin/othttp"
|
|
sdktrace "go.opentelemetry.io/sdk/trace"
|
|
)
|
|
|
|
func ExampleNewHandler() {
|
|
/* curl -v -d "a painting" http://localhost:7777/hello/bob/ross
|
|
...
|
|
* upload completely sent off: 10 out of 10 bytes
|
|
< HTTP/1.1 200 OK
|
|
< Traceparent: 00-76ae040ee5753f38edf1c2bd9bd128bd-dd394138cfd7a3dc-01
|
|
< Date: Fri, 04 Oct 2019 02:33:08 GMT
|
|
< Content-Length: 45
|
|
< Content-Type: text/plain; charset=utf-8
|
|
<
|
|
Hello, bob/ross!
|
|
You sent me this:
|
|
a painting
|
|
*/
|
|
|
|
//import sdktrace "go.opentelemetry.io/sdk/trace"
|
|
sdktrace.Register()
|
|
|
|
// Write spans to stdout
|
|
exporter, err := stdout.NewExporter(stdout.Options{PrettyPrint: true})
|
|
if err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
|
|
// Wrap stdout exporter with SimpleSpanProcessor and register the processor.
|
|
ssp := sdktrace.NewSimpleSpanProcessor(exporter)
|
|
sdktrace.RegisterSpanProcessor(ssp)
|
|
|
|
// For the example, use sdktrace.AlwaysSample sampler to sample all traces.
|
|
// In a production application, use sdktrace.ProbabilitySampler with a desired probability.
|
|
sdktrace.ApplyConfig(sdktrace.Config{DefaultSampler: sdktrace.AlwaysSample()})
|
|
|
|
figureOutName := func(ctx context.Context, s string) (string, error) {
|
|
pp := strings.SplitN(s, "/", 2)
|
|
var err error
|
|
switch pp[1] {
|
|
case "":
|
|
err = fmt.Errorf("expected /hello/:name in %q", s)
|
|
default:
|
|
trace.CurrentSpan(ctx).SetAttribute(core.Key("name").String(pp[1]))
|
|
}
|
|
return pp[1], err
|
|
}
|
|
|
|
var mux http.ServeMux
|
|
mux.Handle("/hello/",
|
|
othttp.WithRouteTag("/hello/:name", http.HandlerFunc(
|
|
func(w http.ResponseWriter, r *http.Request) {
|
|
ctx := r.Context()
|
|
var name string
|
|
// Wrap another function in it's own span
|
|
if err := trace.CurrentSpan(ctx).Tracer().WithSpan(ctx, "figureOutName",
|
|
func(ctx context.Context) error {
|
|
var err error
|
|
name, err = figureOutName(ctx, r.URL.Path[1:])
|
|
return err
|
|
}); err != nil {
|
|
log.Println("error figuring out name: ", err)
|
|
http.Error(w, err.Error(), http.StatusInternalServerError)
|
|
return
|
|
}
|
|
|
|
d, err := ioutil.ReadAll(r.Body)
|
|
if err != nil {
|
|
log.Println("error reading body: ", err)
|
|
w.WriteHeader(http.StatusBadRequest)
|
|
return
|
|
}
|
|
|
|
n, err := io.WriteString(w, "Hello, "+name+"!\nYou sent me this:\n"+string(d))
|
|
if err != nil {
|
|
log.Printf("error writing reply after %d bytes: %s", n, err)
|
|
}
|
|
}),
|
|
),
|
|
)
|
|
|
|
if err := http.ListenAndServe(":7777",
|
|
othttp.NewHandler(&mux, "server",
|
|
othttp.WithMessageEvents(othttp.ReadEvents, othttp.WriteEvents),
|
|
),
|
|
); err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
}
|