mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-11-19 12:50:23 +00:00
134 lines
4.6 KiB
Go
134 lines
4.6 KiB
Go
/*
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Copyright 2021 The Kubernetes Authors.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package tracing
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import (
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"context"
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"net/http"
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"go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp"
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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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sdktrace "go.opentelemetry.io/otel/sdk/trace"
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semconv "go.opentelemetry.io/otel/semconv/v1.17.0"
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oteltrace "go.opentelemetry.io/otel/trace"
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"k8s.io/client-go/transport"
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"k8s.io/component-base/tracing/api/v1"
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)
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// TracerProvider is an OpenTelemetry TracerProvider which can be shut down
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type TracerProvider interface {
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oteltrace.TracerProvider
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Shutdown(context.Context) error
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}
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type noopTracerProvider struct {
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oteltrace.TracerProvider
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}
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func (n *noopTracerProvider) Shutdown(context.Context) error {
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return nil
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}
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func NewNoopTracerProvider() TracerProvider {
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return &noopTracerProvider{TracerProvider: oteltrace.NewNoopTracerProvider()}
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}
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// NewProvider creates a TracerProvider in a component, and enforces recommended tracing behavior
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func NewProvider(ctx context.Context,
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tracingConfig *v1.TracingConfiguration,
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addedOpts []otlptracegrpc.Option,
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resourceOpts []resource.Option,
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) (TracerProvider, error) {
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if tracingConfig == nil {
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return NewNoopTracerProvider(), nil
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}
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opts := append([]otlptracegrpc.Option{}, addedOpts...)
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if tracingConfig.Endpoint != nil {
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opts = append(opts, otlptracegrpc.WithEndpoint(*tracingConfig.Endpoint))
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}
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opts = append(opts, otlptracegrpc.WithInsecure())
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exporter, err := otlptracegrpc.New(ctx, opts...)
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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, resourceOpts...)
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if err != nil {
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return nil, err
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}
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// sampler respects parent span's sampling rate or
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// otherwise never samples.
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sampler := sdktrace.NeverSample()
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// Or, emit spans for a fraction of transactions
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if tracingConfig.SamplingRatePerMillion != nil && *tracingConfig.SamplingRatePerMillion > 0 {
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sampler = sdktrace.TraceIDRatioBased(float64(*tracingConfig.SamplingRatePerMillion) / float64(1000000))
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}
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// batch span processor to aggregate spans before export.
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bsp := sdktrace.NewBatchSpanProcessor(exporter)
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tp := sdktrace.NewTracerProvider(
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sdktrace.WithSampler(sdktrace.ParentBased(sampler)),
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sdktrace.WithSpanProcessor(bsp),
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sdktrace.WithResource(res),
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)
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return tp, nil
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}
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// WithTracing adds tracing to requests if the incoming request is sampled
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func WithTracing(handler http.Handler, tp oteltrace.TracerProvider, spanName string) http.Handler {
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opts := []otelhttp.Option{
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otelhttp.WithPropagators(Propagators()),
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otelhttp.WithTracerProvider(tp),
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}
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wrappedHandler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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// Add the http.target attribute to the otelhttp span
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// Workaround for https://github.com/open-telemetry/opentelemetry-go-contrib/issues/3743
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if r.URL != nil {
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oteltrace.SpanFromContext(r.Context()).SetAttributes(semconv.HTTPTarget(r.URL.RequestURI()))
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}
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handler.ServeHTTP(w, r)
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})
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// With Noop TracerProvider, the otelhttp still handles context propagation.
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// See https://github.com/open-telemetry/opentelemetry-go/tree/main/example/passthrough
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return otelhttp.NewHandler(wrappedHandler, spanName, opts...)
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}
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// WrapperFor can be used to add tracing to a *rest.Config.
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// Example usage:
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// tp := NewProvider(...)
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// config, _ := rest.InClusterConfig()
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// config.Wrap(WrapperFor(tp))
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// kubeclient, _ := clientset.NewForConfig(config)
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func WrapperFor(tp oteltrace.TracerProvider) transport.WrapperFunc {
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return func(rt http.RoundTripper) http.RoundTripper {
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opts := []otelhttp.Option{
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otelhttp.WithPropagators(Propagators()),
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otelhttp.WithTracerProvider(tp),
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}
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// With Noop TracerProvider, the otelhttp still handles context propagation.
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// See https://github.com/open-telemetry/opentelemetry-go/tree/main/example/passthrough
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return otelhttp.NewTransport(rt, opts...)
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}
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}
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// Propagators returns the recommended set of propagators.
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func Propagators() propagation.TextMapPropagator {
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return propagation.NewCompositeTextMapPropagator(propagation.TraceContext{}, propagation.Baggage{})
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}
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