build: move e2e dependencies into e2e/go.mod

Several packages are only used while running the e2e suite. These
packages are less important to update, as the they can not influence the
final executable that is part of the Ceph-CSI container-image.

By moving these dependencies out of the main Ceph-CSI go.mod, it is
easier to identify if a reported CVE affects Ceph-CSI, or only the
testing (like most of the Kubernetes CVEs).

Signed-off-by: Niels de Vos <ndevos@ibm.com>

e2e/vendor/k8s.io/component-base/tracing/utils.go

@@ -0,0 +1,134 @@
+/*
+Copyright 2021 The Kubernetes 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 tracing
+
+import (
+	"context"
+	"net/http"
+
+	"go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp"
+	"go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc"
+	"go.opentelemetry.io/otel/propagation"
+	"go.opentelemetry.io/otel/sdk/resource"
+	sdktrace "go.opentelemetry.io/otel/sdk/trace"
+	semconv "go.opentelemetry.io/otel/semconv/v1.17.0"
+	oteltrace "go.opentelemetry.io/otel/trace"
+	noopoteltrace "go.opentelemetry.io/otel/trace/noop"
+
+	"k8s.io/client-go/transport"
+	"k8s.io/component-base/tracing/api/v1"
+)
+
+// TracerProvider is an OpenTelemetry TracerProvider which can be shut down
+type TracerProvider interface {
+	oteltrace.TracerProvider
+	Shutdown(context.Context) error
+}
+
+type noopTracerProvider struct {
+	oteltrace.TracerProvider
+}
+
+func (n *noopTracerProvider) Shutdown(context.Context) error {
+	return nil
+}
+
+func NewNoopTracerProvider() TracerProvider {
+	return &noopTracerProvider{TracerProvider: noopoteltrace.NewTracerProvider()}
+}
+
+// NewProvider creates a TracerProvider in a component, and enforces recommended tracing behavior
+func NewProvider(ctx context.Context,
+	tracingConfig *v1.TracingConfiguration,
+	addedOpts []otlptracegrpc.Option,
+	resourceOpts []resource.Option,
+) (TracerProvider, error) {
+	if tracingConfig == nil {
+		return NewNoopTracerProvider(), nil
+	}
+	opts := append([]otlptracegrpc.Option{}, addedOpts...)
+	if tracingConfig.Endpoint != nil {
+		opts = append(opts, otlptracegrpc.WithEndpoint(*tracingConfig.Endpoint))
+	}
+	opts = append(opts, otlptracegrpc.WithInsecure())
+	exporter, err := otlptracegrpc.New(ctx, opts...)
+	if err != nil {
+		return nil, err
+	}
+	res, err := resource.New(ctx, resourceOpts...)
+	if err != nil {
+		return nil, err
+	}
+
+	// sampler respects parent span's sampling rate or
+	// otherwise never samples.
+	sampler := sdktrace.NeverSample()
+	// Or, emit spans for a fraction of transactions
+	if tracingConfig.SamplingRatePerMillion != nil && *tracingConfig.SamplingRatePerMillion > 0 {
+		sampler = sdktrace.TraceIDRatioBased(float64(*tracingConfig.SamplingRatePerMillion) / float64(1000000))
+	}
+	// batch span processor to aggregate spans before export.
+	bsp := sdktrace.NewBatchSpanProcessor(exporter)
+	tp := sdktrace.NewTracerProvider(
+		sdktrace.WithSampler(sdktrace.ParentBased(sampler)),
+		sdktrace.WithSpanProcessor(bsp),
+		sdktrace.WithResource(res),
+	)
+	return tp, nil
+}
+
+// WithTracing adds tracing to requests if the incoming request is sampled
+func WithTracing(handler http.Handler, tp oteltrace.TracerProvider, spanName string) http.Handler {
+	opts := []otelhttp.Option{
+		otelhttp.WithPropagators(Propagators()),
+		otelhttp.WithTracerProvider(tp),
+	}
+	wrappedHandler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		// Add the http.target attribute to the otelhttp span
+		// Workaround for https://github.com/open-telemetry/opentelemetry-go-contrib/issues/3743
+		if r.URL != nil {
+			oteltrace.SpanFromContext(r.Context()).SetAttributes(semconv.HTTPTarget(r.URL.RequestURI()))
+		}
+		handler.ServeHTTP(w, r)
+	})
+	// With Noop TracerProvider, the otelhttp still handles context propagation.
+	// See https://github.com/open-telemetry/opentelemetry-go/tree/main/example/passthrough
+	return otelhttp.NewHandler(wrappedHandler, spanName, opts...)
+}
+
+// WrapperFor can be used to add tracing to a *rest.Config.
+// Example usage:
+// tp := NewProvider(...)
+// config, _ := rest.InClusterConfig()
+// config.Wrap(WrapperFor(tp))
+// kubeclient, _ := clientset.NewForConfig(config)
+func WrapperFor(tp oteltrace.TracerProvider) transport.WrapperFunc {
+	return func(rt http.RoundTripper) http.RoundTripper {
+		opts := []otelhttp.Option{
+			otelhttp.WithPropagators(Propagators()),
+			otelhttp.WithTracerProvider(tp),
+		}
+		// With Noop TracerProvider, the otelhttp still handles context propagation.
+		// See https://github.com/open-telemetry/opentelemetry-go/tree/main/example/passthrough
+		return otelhttp.NewTransport(rt, opts...)
+	}
+}
+
+// Propagators returns the recommended set of propagators.
+func Propagators() propagation.TextMapPropagator {
+	return propagation.NewCompositeTextMapPropagator(propagation.TraceContext{}, propagation.Baggage{})
+}