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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
package main
import (
"context"
"fmt"
"log"
"github.com/go-logr/stdr"
"go.opentelemetry.io/contrib/examples/namedtracer/foo"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/baggage"
"go.opentelemetry.io/otel/exporters/stdout/stdouttrace"
sdktrace "go.opentelemetry.io/otel/sdk/trace"
"go.opentelemetry.io/otel/trace"
)
var (
fooKey = attribute.Key("ex.com/foo")
barKey = attribute.Key("ex.com/bar")
anotherKey = attribute.Key("ex.com/another")
)
var tp *sdktrace.TracerProvider
// initTracer creates and registers trace provider instance.
func initTracer() error {
exp, err := stdouttrace.New(stdouttrace.WithPrettyPrint())
if err != nil {
return fmt.Errorf("failed to initialize stdouttrace exporter: %w", err)
}
bsp := sdktrace.NewBatchSpanProcessor(exp)
tp = sdktrace.NewTracerProvider(
sdktrace.WithSampler(sdktrace.AlwaysSample()),
sdktrace.WithSpanProcessor(bsp),
)
otel.SetTracerProvider(tp)
return nil
}
func main() {
// Set logging level to info to see SDK status messages
stdr.SetVerbosity(5)
// initialize trace provider.
if err := initTracer(); err != nil {
log.Panic(err)
}
// Create a named tracer with package path as its name.
tracer := tp.Tracer("go.opentelemetry.io/contrib/examples/namedtracer")
ctx := context.Background()
defer func() { _ = tp.Shutdown(ctx) }()
m0, _ := baggage.NewMemberRaw(string(fooKey), "foo1")
m1, _ := baggage.NewMemberRaw(string(barKey), "bar1")
b, _ := baggage.New(m0, m1)
ctx = baggage.ContextWithBaggage(ctx, b)
var span trace.Span
ctx, span = tracer.Start(ctx, "operation")
defer span.End()
span.AddEvent("Nice operation!", trace.WithAttributes(attribute.Int("bogons", 100)))
span.SetAttributes(anotherKey.String("yes"))
if err := foo.SubOperation(ctx); err != nil {
panic(err)
}
}
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