139 lines
3.8 KiB
Go
139 lines
3.8 KiB
Go
// Copyright 2021 The etcd Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package embed
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import (
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"context"
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"fmt"
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"go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc"
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"go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc"
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"go.opentelemetry.io/otel/propagation"
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"go.opentelemetry.io/otel/sdk/resource"
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tracesdk "go.opentelemetry.io/otel/sdk/trace"
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semconv "go.opentelemetry.io/otel/semconv/v1.4.0"
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"go.uber.org/zap"
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)
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const maxSamplingRatePerMillion = 1000000
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func validateTracingConfig(samplingRate int) error {
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if samplingRate < 0 {
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return fmt.Errorf("tracing sampling rate must be positive")
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}
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if samplingRate > maxSamplingRatePerMillion {
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return fmt.Errorf("tracing sampling rate must be less than %d", maxSamplingRatePerMillion)
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}
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return nil
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}
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type tracingExporter struct {
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exporter tracesdk.SpanExporter
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opts []otelgrpc.Option
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provider *tracesdk.TracerProvider
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}
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func newTracingExporter(ctx context.Context, cfg *Config) (*tracingExporter, error) {
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exporter, err := otlptracegrpc.New(ctx,
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otlptracegrpc.WithInsecure(),
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otlptracegrpc.WithEndpoint(cfg.ExperimentalDistributedTracingAddress),
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)
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if err != nil {
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return nil, err
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}
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res, err := resource.New(ctx,
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resource.WithAttributes(
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semconv.ServiceNameKey.String(cfg.ExperimentalDistributedTracingServiceName),
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),
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)
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if err != nil {
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return nil, err
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}
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if resWithIDKey := determineResourceWithIDKey(cfg.ExperimentalDistributedTracingServiceInstanceID); resWithIDKey != nil {
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// Merge resources into a new
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// resource in case of duplicates.
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res, err = resource.Merge(res, resWithIDKey)
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if err != nil {
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return nil, err
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}
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}
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traceProvider := tracesdk.NewTracerProvider(
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tracesdk.WithBatcher(exporter),
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tracesdk.WithResource(res),
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tracesdk.WithSampler(
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tracesdk.ParentBased(determineSampler(cfg.ExperimentalDistributedTracingSamplingRatePerMillion)),
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),
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)
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options := []otelgrpc.Option{
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otelgrpc.WithPropagators(
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propagation.NewCompositeTextMapPropagator(
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propagation.TraceContext{},
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propagation.Baggage{},
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),
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),
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otelgrpc.WithTracerProvider(
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traceProvider,
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),
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}
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cfg.logger.Debug(
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"distributed tracing enabled",
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zap.String("address", cfg.ExperimentalDistributedTracingAddress),
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zap.String("service-name", cfg.ExperimentalDistributedTracingServiceName),
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zap.String("service-instance-id", cfg.ExperimentalDistributedTracingServiceInstanceID),
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zap.Int("sampling-rate", cfg.ExperimentalDistributedTracingSamplingRatePerMillion),
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)
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return &tracingExporter{
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exporter: exporter,
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opts: options,
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provider: traceProvider,
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}, nil
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}
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func (te *tracingExporter) Close(ctx context.Context) {
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if te.provider != nil {
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te.provider.Shutdown(ctx)
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}
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if te.exporter != nil {
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te.exporter.Shutdown(ctx)
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}
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}
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func determineSampler(samplingRate int) tracesdk.Sampler {
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sampler := tracesdk.NeverSample()
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if samplingRate == 0 {
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return sampler
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}
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return tracesdk.TraceIDRatioBased(float64(samplingRate) / float64(maxSamplingRatePerMillion))
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}
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// As Tracing service Instance ID must be unique, it should
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// never use the empty default string value, it's set if
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// if it's a non empty string.
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func determineResourceWithIDKey(serviceInstanceID string) *resource.Resource {
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if serviceInstanceID != "" {
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return resource.NewSchemaless(
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(semconv.ServiceInstanceIDKey.String(serviceInstanceID)),
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)
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}
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return nil
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}
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