// 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" "go.opentelemetry.io/otel/attribute" "go.opentelemetry.io/otel/baggage" "go.opentelemetry.io/otel/example/namedtracer/foo" "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() { var err error exp, err := stdouttrace.New(stdouttrace.WithPrettyPrint()) if err != nil { log.Panicf("failed to initialize stdouttrace exporter %v\n", err) return } bsp := sdktrace.NewBatchSpanProcessor(exp) tp = sdktrace.NewTracerProvider( sdktrace.WithSampler(sdktrace.AlwaysSample()), sdktrace.WithSpanProcessor(bsp), ) otel.SetTracerProvider(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() defer func() { _ = tp.Shutdown(ctx) }() m0, _ := baggage.NewMember(string(fooKey), "foo1") m1, _ := baggage.NewMember(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) } }