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opentelemetry-go/example/namedtracer/main.go

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// 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.
package main
import (
"context"
"log"
"go.opentelemetry.io/otel/api/kv"
"go.opentelemetry.io/otel/api/correlation"
"go.opentelemetry.io/otel/api/global"
"go.opentelemetry.io/otel/api/trace"
"go.opentelemetry.io/otel/example/namedtracer/foo"
"go.opentelemetry.io/otel/exporters/trace/stdout"
sdktrace "go.opentelemetry.io/otel/sdk/trace"
)
var (
fooKey = kv.Key("ex.com/foo")
barKey = kv.Key("ex.com/bar")
anotherKey = kv.Key("ex.com/another")
)
var tp *sdktrace.Provider
// initTracer creates and registers trace provider instance.
func initTracer() {
var err error
exp, err := stdout.NewExporter(stdout.Options{})
if err != nil {
log.Panicf("failed to initialize stdout exporter %v\n", err)
return
}
tp, err = sdktrace.NewProvider(sdktrace.WithSyncer(exp),
sdktrace.WithConfig(sdktrace.Config{DefaultSampler: sdktrace.AlwaysSample()}))
if err != nil {
log.Panicf("failed to initialize trace provider %v\n", err)
}
global.SetTraceProvider(tp)
}
func main() {
// initialize trace provider.
initTracer()
// Create a named tracer with package path as its name.
tracer := tp.Tracer("example/namedtracer/main")
ctx := context.Background()
ctx = correlation.NewContext(ctx,
fooKey.String("foo1"),
barKey.String("bar1"),
)
err := tracer.WithSpan(ctx, "operation", func(ctx context.Context) error {
trace.SpanFromContext(ctx).AddEvent(ctx, "Nice operation!", kv.Key("bogons").Int(100))
trace.SpanFromContext(ctx).SetAttributes(anotherKey.String("yes"))
return foo.SubOperation(ctx)
})
if err != nil {
panic(err)
}
}