1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
|
/*
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 filters
import (
"net/http"
"go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp"
semconv "go.opentelemetry.io/otel/semconv/v1.17.0"
"go.opentelemetry.io/otel/trace"
"k8s.io/apiserver/pkg/endpoints/request"
"k8s.io/apiserver/pkg/authentication/user"
tracing "k8s.io/component-base/tracing"
)
// WithTracing adds tracing to requests if the incoming request is sampled
func WithTracing(handler http.Handler, tp trace.TracerProvider) http.Handler {
opts := []otelhttp.Option{
otelhttp.WithPropagators(tracing.Propagators()),
otelhttp.WithPublicEndpointFn(notSystemPrivilegedGroup),
otelhttp.WithTracerProvider(tp),
otelhttp.WithSpanNameFormatter(func(operation string, r *http.Request) string {
ctx := r.Context()
info, exist := request.RequestInfoFrom(ctx)
if !exist || !info.IsResourceRequest {
return r.Method
}
return getSpanNameFromRequestInfo(info, r)
}),
}
wrappedHandler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
// Adjust otelhttp tracing start time to match the start time used
// for Prometheus metrics.
if startTime, ok := request.ReceivedTimestampFrom(r.Context()); ok {
r = r.WithContext(otelhttp.ContextWithStartTime(r.Context(), startTime))
}
// 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 {
trace.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, "KubernetesAPI", opts...)
}
func getSpanNameFromRequestInfo(info *request.RequestInfo, r *http.Request) string {
spanName := "/" + info.APIPrefix
if info.APIGroup != "" {
spanName += "/" + info.APIGroup
}
spanName += "/" + info.APIVersion
if info.Namespace != "" {
spanName += "/namespaces/{:namespace}"
}
spanName += "/" + info.Resource
if info.Name != "" {
spanName += "/" + "{:name}"
}
if info.Subresource != "" {
spanName += "/" + info.Subresource
}
return r.Method + " " + spanName
}
func notSystemPrivilegedGroup(req *http.Request) bool {
if u, ok := request.UserFrom(req.Context()); ok {
for _, group := range u.GetGroups() {
if group == user.SystemPrivilegedGroup || group == user.MonitoringGroup {
return false
}
}
}
return true
}
|
