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81 lines
2.7 KiB
81 lines
2.7 KiB
/*
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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 traces
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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"
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"go.opentelemetry.io/otel/exporters/otlp/otlpgrpc"
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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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"go.opentelemetry.io/otel/trace"
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"k8s.io/client-go/transport"
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"k8s.io/klog/v2"
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)
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// NewProvider initializes tracing in the component, and enforces recommended tracing behavior.
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func NewProvider(ctx context.Context, baseSampler sdktrace.Sampler, resourceOpts []resource.Option, opts ...otlpgrpc.Option) trace.TracerProvider {
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opts = append(opts, otlpgrpc.WithInsecure())
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driver := otlpgrpc.NewDriver(opts...)
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exporter, err := otlp.NewExporter(ctx, driver)
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if err != nil {
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klog.Fatalf("Failed to create OTLP exporter: %v", 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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klog.Fatalf("Failed to create resource: %v", err)
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}
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bsp := sdktrace.NewBatchSpanProcessor(exporter)
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return sdktrace.NewTracerProvider(
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sdktrace.WithSampler(sdktrace.ParentBased(baseSampler)),
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sdktrace.WithSpanProcessor(bsp),
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sdktrace.WithResource(res),
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)
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}
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// WrapperFor can be used to add tracing to a *rest.Config. Example usage:
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// tp := traces.NewProvider(...)
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// config, _ := rest.InClusterConfig()
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// config.Wrap(traces.WrapperFor(&tp))
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// kubeclient, _ := clientset.NewForConfig(config)
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func WrapperFor(tp *trace.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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}
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if tp != nil {
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opts = append(opts, otelhttp.WithTracerProvider(*tp))
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}
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// Even if there is no 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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