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provider.go
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provider.go
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// Copyright 2021 Lumberjack authors (see AUTHORS file)
//
// 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 trace manages open telemetry trace exporter.
package trace
import (
"context"
"fmt"
"time"
texporter "github.com/GoogleCloudPlatform/opentelemetry-operations-go/exporter/trace"
"github.com/GoogleCloudPlatform/opentelemetry-operations-go/propagator"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/propagation"
sdktrace "go.opentelemetry.io/otel/sdk/trace"
)
// Init initializes and sets the global trace exporter.
func Init(traceRatio float64) error {
exporter, err := texporter.New()
if err != nil {
return fmt.Errorf("failed to create trace exporter: %w", err)
}
// According to https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/trace/sdk.md#parentbased
// If the parent is sampled, it will be sampled here.
// If the parent is not sampled, it won't be sampled here.
// If this is the root span, it will be sampled with the given ratio below.
sampler := sdktrace.ParentBased(sdktrace.TraceIDRatioBased(traceRatio))
tp := sdktrace.NewTracerProvider(
sdktrace.WithSampler(sampler),
sdktrace.WithBatcher(exporter),
)
otel.SetTracerProvider(tp)
otel.SetTextMapPropagator(propagation.NewCompositeTextMapPropagator(
// For google cloud specifically.
propagator.CloudTraceFormatPropagator{},
propagation.TraceContext{},
propagation.Baggage{},
))
return nil
}
// Shutdown shuts down the global trace exporter.
func Shutdown() error {
tpRaw := otel.GetTracerProvider()
tp, ok := tpRaw.(*sdktrace.TracerProvider)
if !ok {
// Not the trace provider we expect, ignore.
return nil
}
ctx, done := context.WithTimeout(context.Background(), 5*time.Second)
defer done()
return tp.Shutdown(ctx)
}