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testing.go
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testing.go
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/*
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 testing
import (
"crypto"
"fmt"
"os"
"path/filepath"
"regexp"
"runtime"
"runtime/debug"
"strings"
"sync"
"testing"
kubeadmapi "k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm"
"k8s.io/kubernetes/cmd/kubeadm/app/util/pkiutil"
)
// RunWithPrivateKeyFixtureDirectory overrides NewPrivateKey to return private key fixtures
// while executing tests in m.
func RunWithPrivateKeyFixtureDirectory(m *testing.M) {
defer install()()
os.Exit(m.Run())
}
// Reset indicates a new test is starting and previously returned private key fixtures may be reused.
func Reset() {
lock.Lock()
defer lock.Unlock()
ecdsa = 0
rsa = 0
}
var (
testFunction = regexp.MustCompile(`.*\.Test[^./]+(.func\d*)?$`)
lock = sync.Mutex{}
fixtureDir = ""
lastTest = ""
ecdsa = 0
rsa = 0
)
func install() (cleanup func()) {
lock.Lock()
defer lock.Unlock()
_, filename, _, ok := runtime.Caller(1)
if !ok {
fmt.Println("Could not determine testdata location, skipping private key fixture installation")
return func() {}
}
fixtureDir = filepath.Join(filepath.Dir(filename), "testdata")
originalNewPrivateKey := pkiutil.NewPrivateKey
pkiutil.NewPrivateKey = newPrivateKey
return func() {
pkiutil.NewPrivateKey = originalNewPrivateKey
}
}
func newPrivateKey(keyType kubeadmapi.EncryptionAlgorithmType) (crypto.Signer, error) {
lock.Lock()
defer lock.Unlock()
var pcs [50]uintptr
nCallers := runtime.Callers(2, pcs[:])
frames := runtime.CallersFrames(pcs[:nCallers])
thisTest := ""
for {
frame, more := frames.Next()
if strings.HasSuffix(frame.File, "_test.go") && testFunction.MatchString(frame.Function) {
thisTest = frame.Function
break
}
if !more {
break
}
}
if len(thisTest) == 0 {
fmt.Println("could not determine test for private key fixture")
debug.PrintStack()
return pkiutil.GeneratePrivateKey(keyType)
}
if thisTest != lastTest {
rsa = 0
ecdsa = 0
lastTest = thisTest
}
keyName := ""
switch keyType {
case kubeadmapi.EncryptionAlgorithmECDSAP256:
ecdsa++
keyName = fmt.Sprintf("%d.ecdsa", ecdsa)
default:
rsa++
keyName = fmt.Sprintf("%d.rsa", rsa)
}
if len(keyName) > 0 {
privKey, err := pkiutil.TryLoadKeyFromDisk(fixtureDir, keyName)
if err == nil {
return privKey, nil
}
}
fmt.Println("GeneratePrivateKey " + keyName + " for " + thisTest)
signer, err := pkiutil.GeneratePrivateKey(keyType)
if err != nil {
return signer, err
}
if len(keyName) > 0 {
pkiutil.WriteKey(fixtureDir, keyName, signer)
}
return signer, err
}