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opentelemetry-go/example/zipkin/main.go
Matej Gera 77de1998cf
Minor change: ParentSampler -> ParentBased in Zipkin example description (#1171)
* ParentSampler -> ParentBased in Zipkin example description

* update CHANGELOG
2020-09-13 14:45:46 -04:00

77 lines
2.1 KiB
Go

// Copyright The 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.
// Command zipkin is an example program that creates spans
// and uploads to openzipkin collector.
package main
import (
"context"
"flag"
"log"
"os"
"time"
"go.opentelemetry.io/otel/api/global"
"go.opentelemetry.io/otel/exporters/trace/zipkin"
sdktrace "go.opentelemetry.io/otel/sdk/trace"
)
var logger = log.New(os.Stderr, "zipkin-example", log.Ldate|log.Ltime|log.Llongfile)
// initTracer creates a new trace provider instance and registers it as global trace provider.
func initTracer(url string) {
// Create Zipkin Exporter and install it as a global tracer.
//
// For demoing purposes, always sample. In a production application, you should
// configure the sampler to a trace.ParentBased(trace.TraceIDRatioBased) set at the desired
// ratio.
err := zipkin.InstallNewPipeline(
url,
"zipkin-test",
zipkin.WithLogger(logger),
zipkin.WithSDK(&sdktrace.Config{DefaultSampler: sdktrace.AlwaysSample()}),
)
if err != nil {
log.Fatal(err)
}
}
func main() {
url := flag.String("zipkin", "http://localhost:9411/api/v2/spans", "zipkin url")
flag.Parse()
initTracer(*url)
ctx := context.Background()
tr := global.TracerProvider().Tracer("component-main")
ctx, span := tr.Start(ctx, "foo")
<-time.After(6 * time.Millisecond)
bar(ctx)
<-time.After(6 * time.Millisecond)
span.End()
// Wait for the spans to be exported.
<-time.After(5 * time.Second)
}
func bar(ctx context.Context) {
tr := global.TracerProvider().Tracer("component-bar")
_, span := tr.Start(ctx, "bar")
<-time.After(6 * time.Millisecond)
span.End()
}