118 lines
3.2 KiB
Go
118 lines
3.2 KiB
Go
/*
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Copyright 2019 The Kubernetes Authors All rights reserved.
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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 util
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import (
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"bytes"
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"encoding/json"
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"fmt"
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"math/rand"
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"os/exec"
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"testing"
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"time"
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"k8s.io/minikube/pkg/util/retry"
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)
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const kubectlBinary = "kubectl"
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// KubectlRunner runs a command using kubectl
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type KubectlRunner struct {
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Profile string // kube-context maps to a minikube profile
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T *testing.T
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BinaryPath string
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}
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// NewKubectlRunner creates a new KubectlRunner
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func NewKubectlRunner(t *testing.T, profile ...string) *KubectlRunner {
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if profile == nil {
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profile = []string{"minikube"}
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}
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p, err := exec.LookPath(kubectlBinary)
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if err != nil {
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t.Fatalf("Couldn't find kubectl on path.")
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}
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return &KubectlRunner{Profile: profile[0], BinaryPath: p, T: t}
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}
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// RunCommandParseOutput runs a command and parses the JSON output
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func (k *KubectlRunner) RunCommandParseOutput(args []string, outputObj interface{}, useKubeContext ...bool) error {
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args = append(args, "-o=json")
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output, err := k.RunCommand(args, useKubeContext...)
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if err != nil {
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return err
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}
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d := json.NewDecoder(bytes.NewReader(output))
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if err := d.Decode(outputObj); err != nil {
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return err
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}
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return nil
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}
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// RunCommand runs a command, returning stdout
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func (k *KubectlRunner) RunCommand(args []string, useKubeContext ...bool) (stdout []byte, err error) {
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if useKubeContext == nil {
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useKubeContext = []bool{true}
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}
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if useKubeContext[0] {
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kubecContextArg := fmt.Sprintf("--context=%s", k.Profile)
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args = append([]string{kubecContextArg}, args...) // prepending --context so it can be with with -- space
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}
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inner := func() error {
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cmd := exec.Command(k.BinaryPath, args...)
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stdout, err = cmd.CombinedOutput()
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if err != nil {
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retriable := &retry.RetriableError{Err: fmt.Errorf("error running command %s: %v. Stdout: \n %s", args, err, stdout)}
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k.T.Log(retriable)
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return retriable
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}
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return nil
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}
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err = retry.Expo(inner, time.Millisecond*500, 1*time.Minute, 5)
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return stdout, err
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}
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// CreateRandomNamespace creates a random namespace
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func (k *KubectlRunner) CreateRandomNamespace() string {
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const strLen = 20
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name := genRandString(strLen)
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if _, err := k.RunCommand([]string{"create", "namespace", name}); err != nil {
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k.T.Fatalf("Error creating namespace: %v", err)
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}
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return name
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}
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func genRandString(strLen int) string {
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const chars = "abcdefghijklmnopqrstuvwxyz0123456789"
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rand.Seed(time.Now().UTC().UnixNano())
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result := make([]byte, strLen)
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for i := 0; i < strLen; i++ {
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result[i] = chars[rand.Intn(len(chars))]
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}
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return string(result)
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}
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// DeleteNamespace deletes the namespace
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func (k *KubectlRunner) DeleteNamespace(namespace string) error {
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_, err := k.RunCommand([]string{"delete", "namespace", namespace})
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return err
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}
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