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opentelemetry-go/example/http/server/server.go
Steven Karis fa7d053793 Add stdout trace exporter (#153)
* Add stdout trace exporter (#134)

* Update go.mod and go.sum

* Do not use assert in tests
2019-09-28 11:27:02 -07:00

77 lines
2.1 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 main
import (
"io"
"log"
"net/http"
"go.opentelemetry.io/api/tag"
"go.opentelemetry.io/api/trace"
"go.opentelemetry.io/exporter/trace/stdout"
"go.opentelemetry.io/plugin/httptrace"
sdktrace "go.opentelemetry.io/sdk/trace"
)
func initTracer() {
sdktrace.Register()
// Create Jaeger exporter to be able to retrieve
// the collected spans.
exporter, err := stdout.NewExporter(stdout.Options{PrettyPrint: true})
if err != nil {
log.Fatal(err)
}
// Wrap Jaeger exporter with SimpleSpanProcessor and register the processor.
ssp := sdktrace.NewSimpleSpanProcessor(exporter)
sdktrace.RegisterSpanProcessor(ssp)
// For the demonstration, 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()})
}
func main() {
initTracer()
helloHandler := func(w http.ResponseWriter, req *http.Request) {
attrs, tags, spanCtx := httptrace.Extract(req.Context(), req)
req = req.WithContext(tag.WithMap(req.Context(), tag.NewMap(tag.MapUpdate{
MultiKV: tags,
})))
ctx, span := trace.GlobalTracer().Start(
req.Context(),
"hello",
trace.WithAttributes(attrs...),
trace.ChildOf(spanCtx),
)
defer span.End()
span.AddEvent(ctx, "handling this...")
_, _ = io.WriteString(w, "Hello, world!\n")
}
http.HandleFunc("/hello", helloHandler)
err := http.ListenAndServe(":7777", nil)
if err != nil {
panic(err)
}
}