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opentelemetry-go/example/jaeger/main.go

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// 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.
// Command jaeger is an example program that creates spans
// and uploads to Jaeger.
package main
import (
"context"
"log"
"go.opentelemetry.io/otel/api/core"
"go.opentelemetry.io/otel/api/global"
"go.opentelemetry.io/otel/api/key"
"go.opentelemetry.io/otel/exporters/trace/jaeger"
sdktrace "go.opentelemetry.io/otel/sdk/trace"
)
// initTracer creates a new trace provider instance and registers it as global trace provider.
func initTracer() func() {
// Create and install Jaeger export pipeline
_, flush, err := jaeger.NewExportPipeline(
jaeger.WithCollectorEndpoint("http://localhost:14268/api/traces"),
jaeger.WithProcess(jaeger.Process{
ServiceName: "trace-demo",
Tags: []core.KeyValue{
key.String("exporter", "jaeger"),
key.Float64("float", 312.23),
},
}),
jaeger.RegisterAsGlobal(),
jaeger.WithSDK(&sdktrace.Config{DefaultSampler: sdktrace.AlwaysSample()}),
)
if err != nil {
log.Fatal(err)
}
return func() {
flush()
}
}
func main() {
fn := initTracer()
defer fn()
ctx := context.Background()
tr := global.Tracer("component-main")
ctx, span := tr.Start(ctx, "foo")
bar(ctx)
span.End()
}
func bar(ctx context.Context) {
tr := global.Tracer("component-bar")
_, span := tr.Start(ctx, "bar")
defer span.End()
// Do bar...
}